/* リセットとベーススタイル */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Noto Sans JP', sans-serif;
    line-height: 1.6;
    color: #e0e0e0;
    overflow-x: hidden;
    background:
        radial-gradient(circle at 20% 20%, rgba(255, 71, 87, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(255, 107, 107, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 40% 60%, rgba(255, 142, 142, 0.05) 0%, transparent 50%),
        linear-gradient(135deg, #1a1a1a 0%, #2d2d2d 100%);
    background-attachment: fixed;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 輪ゴムエフェクト用の要素 */
.rubber-band-effect {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 9999;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.rubber-band-effect.active {
    opacity: 1;
}

.rubber-band-effect::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 200px;
    height: 20px;
    background:
        linear-gradient(45deg,
            #ff4757 0%,
            #ff6b6b 25%,
            #ff8e8e 50%,
            #ff6b6b 75%,
            #ff4757 100%);
    border-radius: 10px;
    transform: translate(-50%, -50%) scaleX(0);
    transform-origin: center;
    transition: transform 0.6s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    box-shadow:
        0 0 20px rgba(255, 71, 87, 0.5),
        inset 0 2px 4px rgba(255, 255, 255, 0.3),
        inset 0 -2px 4px rgba(0, 0, 0, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.rubber-band-effect.active::before {
    transform: translate(-50%, -50%) scaleX(6);
    animation: rubberStretchEffect 2.5s ease-out;
}

@keyframes rubberStretchEffect {
    0% {
        transform: translate(-50%, -50%) scaleX(0) scaleY(1);
        filter: brightness(1);
    }
    30% {
        transform: translate(-50%, -50%) scaleX(4) scaleY(1);
        filter: brightness(1.1);
    }
    60% {
        transform: translate(-50%, -50%) scaleX(7) scaleY(1);
        filter: brightness(1.15);
    }
    100% {
        transform: translate(-50%, -50%) scaleX(6) scaleY(1);
        filter: brightness(1);
    }
}

/* すべてのdivを横に伸ばすエフェクト */
.rubber-stretch {
    animation: divStretchHorizontal 2.5s ease-in-out;
    transform-origin: center;
}

@keyframes divStretchHorizontal {
    0% {
        transform: scaleX(1);
    }
    30% {
        transform: scaleX(1.3);
    }
    50% {
        transform: scaleX(1.5);
    }
    70% {
        transform: scaleX(1.3);
    }
    100% {
        transform: scaleX(1);
    }
}

/* イベント終了告知バナー（サイト最上部に固定） */
.event-closed-banner {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1001;
    background: linear-gradient(90deg, rgba(255, 71, 87, 0.95) 0%, rgba(255, 107, 107, 0.95) 100%);
    color: #fff;
    text-align: center;
    padding: 0.6rem 1rem;
    box-shadow: 0 2px 8px rgba(255, 71, 87, 0.3);
}

.event-closed-banner__text {
    margin: 0;
    font-size: 0.95rem;
    font-weight: 700;
    letter-spacing: 0.05em;
}

/* ヘッダー（終了バナー下に表示） */
.header {
    position: fixed;
    top: 2.6rem; /* 終了バナーの高さ分下にずらす */
    left: 0;
    width: 100%;
    background: rgba(26, 26, 26, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255, 71, 87, 0.2);
    z-index: 1000;
    padding: 1rem 0;
    transition: all 0.3s ease;
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.nav-brand {
    position: relative;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.logo-container {
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
    text-decoration: none;
    color: inherit;
}

.logo-image {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    border: 3px solid #ff6b6b;
    box-shadow:
        0 4px 8px rgba(255, 71, 87, 0.3),
        inset 0 2px 4px rgba(255, 255, 255, 0.3);
    transition: all 0.3s ease;
    object-fit: cover;
    object-position: center top;
}

.logo-image:hover {
    transform: scale(1.1) rotate(5deg);
    box-shadow:
        0 6px 12px rgba(255, 71, 87, 0.5),
        inset 0 2px 4px rgba(255, 255, 255, 0.4);
}

.logo {
    font-size: 2rem;
    font-weight: 700;
    color: #ff6b6b;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.1);
    margin: 0;
    line-height: 1.2;
}

.logo-subtitle {
    font-size: 0.85rem;
    color: #c0c0c0;
    font-weight: 400;
    margin: 0;
    line-height: 1.2;
    letter-spacing: 0.05em;
    text-align: right;
    margin-top: -0.3rem;
}

.rubber-band-decoration {
    position: absolute;
    bottom: 5px;
    left: 0;
    width: 100%;
    height: 6px;
    background:
        linear-gradient(90deg,
            #ff2d55 0%,
            #ff4757 25%,
            #ff6b6b 50%,
            #ff4757 75%,
            #ff2d55 100%);
    border-radius: 3px;
    box-shadow:
        0 2px 4px rgba(255, 45, 85, 0.4),
        inset 0 1px 2px rgba(255, 255, 255, 0.4),
        inset 0 -1px 2px rgba(0, 0, 0, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.3);
}

@keyframes rubberStretch {
    0%, 100% {
        transform: scaleX(1) scaleY(1);
        filter: brightness(1);
    }
    25% {
        transform: scaleX(1.1) scaleY(0.8);
        filter: brightness(1.1);
    }
    50% {
        transform: scaleX(1.3) scaleY(0.6);
        filter: brightness(1.2);
    }
    75% {
        transform: scaleX(1.1) scaleY(0.8);
        filter: brightness(1.1);
    }
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-link {
    text-decoration: none;
    color: #e0e0e0;
    font-weight: 500;
    position: relative;
    transition: color 0.3s ease;
}

.nav-link:hover {
    color: #ff6b6b;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: #ff6b6b;
    transition: width 0.3s ease;
}

.nav-link:hover::after {
    width: 100%;
}

/* メインビジュアル */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 142px; /* 終了バナー(2.6rem) + ヘッダー分 */
    background:
        radial-gradient(circle at 20% 20%, rgba(255, 45, 85, 0.3) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(255, 71, 87, 0.2) 0%, transparent 50%),
        radial-gradient(circle at 40% 60%, rgba(255, 107, 107, 0.15) 0%, transparent 50%),
        linear-gradient(135deg, #0a0a0a 0%, #1a1a1a 25%, #2d2d2d 50%, #1a1a1a 75%, #0a0a0a 100%);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(circle at 30% 30%, rgba(255, 45, 85, 0.1) 0%, transparent 40%),
        radial-gradient(circle at 70% 70%, rgba(255, 71, 87, 0.08) 0%, transparent 40%);
    animation: heroBackgroundPulse 8s ease-in-out infinite;
}

@keyframes heroBackgroundPulse {
    0%, 100% {
        opacity: 1;
        transform: scale(1);
    }
    50% {
        opacity: 0.8;
        transform: scale(1.05);
    }
}

.hero-content {
    flex: 1;
    padding: 0 20px;
    z-index: 2;
}

@media (min-width: 769px) {
    .hero-content {
        padding-left: 5%;
        padding-right: 20px;
        max-width: 600px;
    }
}

.hero-title {
    font-size: 4rem;
    font-weight: 900;
    color: white;
    margin-bottom: 1rem;
    text-shadow:
        0 0 20px rgba(255, 45, 85, 0.8),
        0 0 40px rgba(255, 71, 87, 0.6),
        0 0 60px rgba(255, 107, 107, 0.4),
        2px 2px 4px rgba(0,0,0,0.8);
    position: relative;
}

.hero-title::before {
    content: '';
    position: absolute;
    top: -10px;
    left: -10px;
    right: -10px;
    bottom: -10px;
    background: linear-gradient(45deg,
        rgba(255, 45, 85, 0.1) 0%,
        rgba(255, 71, 87, 0.1) 25%,
        rgba(255, 107, 107, 0.1) 50%,
        rgba(255, 71, 87, 0.1) 75%,
        rgba(255, 45, 85, 0.1) 100%);
    border-radius: 20px;
    animation: titleGlow 3s ease-in-out infinite, rubberBandGlow 4s ease-in-out infinite;
    z-index: -1;
}

.hero-title::after {
    content: '';
    position: absolute;
    top: 50%;
    left: -20px;
    right: -20px;
    height: 4px;
    background: linear-gradient(90deg,
        transparent 0%,
        rgba(255, 107, 107, 0.6) 20%,
        rgba(255, 71, 87, 0.8) 50%,
        rgba(255, 107, 107, 0.6) 80%,
        transparent 100%);
    transform: translateY(-50%);
    border-radius: 2px;
    animation: rubberBandStretch 3s ease-in-out infinite;
    z-index: -1;
}

@keyframes titleGlow {
    0%, 100% {
        opacity: 0.3;
        transform: scale(1);
    }
    50% {
        opacity: 0.6;
        transform: scale(1.02);
    }
}

@keyframes rubberBandGlow {
    0%, 100% {
        transform: scaleX(1) scaleY(1);
        opacity: 0.3;
    }
    20% {
        transform: scaleX(1.2) scaleY(0.8);
        opacity: 0.5;
    }
    40% {
        transform: scaleX(0.8) scaleY(1.2);
        opacity: 0.4;
    }
    60% {
        transform: scaleX(1.15) scaleY(0.85);
        opacity: 0.45;
    }
    80% {
        transform: scaleX(0.85) scaleY(1.15);
        opacity: 0.4;
    }
}

@keyframes rubberBandStretch {
    0%, 100% {
        transform: translateY(-50%) scaleX(1) scaleY(1);
        opacity: 0.6;
    }
    15% {
        transform: translateY(-50%) scaleX(1.5) scaleY(0.7);
        opacity: 0.9;
    }
    30% {
        transform: translateY(-50%) scaleX(0.7) scaleY(1.3);
        opacity: 0.5;
    }
    45% {
        transform: translateY(-50%) scaleX(1.3) scaleY(0.8);
        opacity: 0.8;
    }
    60% {
        transform: translateY(-50%) scaleX(0.9) scaleY(1.2);
        opacity: 0.6;
    }
    75% {
        transform: translateY(-50%) scaleX(1.2) scaleY(0.9);
        opacity: 0.7;
    }
    90% {
        transform: translateY(-50%) scaleX(0.95) scaleY(1.1);
        opacity: 0.65;
    }
}

.hero-tagline {
    font-size: 1.1rem;
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: 0.5rem;
    letter-spacing: 0.3em;
    text-transform: uppercase;
    animation: fadeIn 1s ease-out both;
    text-shadow: 0 2px 4px rgba(0,0,0,0.5);
    position: relative;
    display: inline-block;
}

.title-line {
    display: block;
    animation: slideInUp 1.2s ease-out;
    position: relative;
    white-space: nowrap;
}

.title-line:nth-child(1) {
    font-size: 1.2em;
    background: linear-gradient(45deg, #ffeb3b, #ffc107, #ff9800);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: none;
    filter: drop-shadow(0 0 20px rgba(255, 193, 7, 0.8));
}

.title-line:nth-child(2) {
    animation-delay: 0.3s;
    font-size: 0.85em;
    color: #fff;
}

@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(50px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-subtitle {
    font-size: 1.2rem;
    color: rgba(255, 255, 255, 0.85);
    margin-bottom: 2rem;
    animation: fadeIn 1.5s ease-out 0.6s both;
    text-shadow: 0 2px 4px rgba(0,0,0,0.5);
    position: relative;
    font-weight: 500;
    letter-spacing: 0.1em;
}

.hero-subtitle::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, #ff6b6b, #ffeb3b);
    border-radius: 2px;
}

@keyframes subtitleUnderline {
    0%, 100% {
        width: 100px;
        opacity: 0.8;
    }
    50% {
        width: 150px;
        opacity: 1;
    }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes rubberStretchText {
    0%, 100% {
        transform: scaleX(1) scaleY(1);
    }
    20% {
        transform: scaleX(1.15) scaleY(0.85);
    }
    40% {
        transform: scaleX(0.85) scaleY(1.15);
    }
    60% {
        transform: scaleX(1.1) scaleY(0.9);
    }
    80% {
        transform: scaleX(0.9) scaleY(1.1);
    }
}

@keyframes rubberTitlePulse {
    0%, 100% {
        transform: scaleX(1) scaleY(1);
        filter: brightness(1);
    }
    20% {
        transform: scaleX(1.1) scaleY(0.9);
        filter: brightness(1.1);
    }
    40% {
        transform: scaleX(0.9) scaleY(1.1);
        filter: brightness(0.95);
    }
    60% {
        transform: scaleX(1.05) scaleY(0.95);
        filter: brightness(1.05);
    }
    80% {
        transform: scaleX(0.95) scaleY(1.05);
        filter: brightness(0.98);
    }
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    animation: fadeIn 1s ease-out 0.6s both;
}

.btn {
    padding: 1rem 2rem;
    border: none;
    border-radius: 50px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    position: relative;
    overflow: hidden;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-block;
}

.btn-primary {
    background:
        linear-gradient(45deg,
            #ff4757 0%,
            #ff6b6b 25%,
            #ff8e8e 50%,
            #ff6b6b 75%,
            #ff4757 100%);
    color: white;
    box-shadow:
        0 4px 15px rgba(255, 71, 87, 0.4),
        inset 0 2px 4px rgba(255, 255, 255, 0.3),
        inset 0 -2px 4px rgba(0, 0, 0, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.2);
    position: relative;
    overflow: hidden;
}

.btn-primary::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg,
        transparent 0%,
        rgba(255, 255, 255, 0.4) 50%,
        transparent 100%);
    transition: left 0.5s ease;
}

.btn-primary:hover::before {
    left: 100%;
}

.btn-primary:hover {
    transform: translateY(-2px) scale(1.02);
    box-shadow:
        0 6px 20px rgba(255, 71, 87, 0.6),
        inset 0 2px 4px rgba(255, 255, 255, 0.4),
        inset 0 -2px 4px rgba(0, 0, 0, 0.2);
    filter: brightness(1.1);
}

.btn-secondary {
    background: transparent;
    color: white;
    border: 2px solid white;
}

.btn-secondary:hover {
    background: white;
    color: #667eea;
}

.btn-rubber-band {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 2px;
    background: rgba(255, 255, 255, 0.8);
    transform: translate(-50%, -50%);
    transition: width 0.3s ease;
}

.btn:hover .btn-rubber-band {
    width: 80%;
}

.hero-visual {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
}

/* セクション共通スタイル */
.section {
    padding: 5rem 0;
}

.section-title {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 3rem;
    color: #e0e0e0;
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    height: 6px;
    background:
        linear-gradient(90deg,
            #ff2d55 0%,
            #ff4757 25%,
            #ff6b6b 50%,
            #ff4757 75%,
            #ff2d55 100%);
    border-radius: 3px;
    box-shadow:
        0 2px 4px rgba(255, 45, 85, 0.4),
        inset 0 1px 2px rgba(255, 255, 255, 0.4),
        inset 0 -1px 2px rgba(0, 0, 0, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.3);
    animation: rubberTitleStretch 3s ease-in-out infinite;
}

@keyframes rubberTitleStretch {
    0%, 100% {
        transform: translateX(-50%) scaleX(1) scaleY(1);
        filter: brightness(1);
    }
    25% {
        transform: translateX(-50%) scaleX(1.1) scaleY(0.8);
        filter: brightness(1.1);
    }
    50% {
        transform: translateX(-50%) scaleX(1.2) scaleY(0.6);
        filter: brightness(1.2);
    }
    75% {
        transform: translateX(-50%) scaleX(1.1) scaleY(0.8);
        filter: brightness(1.1);
    }
}

/* About セクション */
.about {
    background:
        radial-gradient(circle at 30% 30%, rgba(255, 71, 87, 0.15) 0%, transparent 40%),
        radial-gradient(circle at 70% 70%, rgba(255, 107, 107, 0.1) 0%, transparent 40%),
        #2a2a2a;
    position: relative;
}

.about::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(circle at 10% 20%, rgba(255, 71, 87, 0.05) 0%, transparent 30%),
        radial-gradient(circle at 90% 80%, rgba(255, 107, 107, 0.05) 0%, transparent 30%);
    pointer-events: none;
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 3rem;
    align-items: center;
}

.about-name {
    font-size: 1.8rem;
    font-weight: 700;
    color: #ff6b6b;
    margin-bottom: 1.5rem;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.1);
}

.about-text p {
    font-size: 1.1rem;
    margin-bottom: 1rem;
    color: #c0c0c0;
}

.about-sns {
    margin-top: 2rem;
}

.about-sns h4 {
    font-size: 1.3rem;
    color: #e0e0e0;
    margin-bottom: 1rem;
}

.about-sns-links {
    display: flex;
    gap: 1rem;
}

.about-sns-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.8rem 1.2rem;
    background: #3a3a3a;
    border-radius: 10px;
    text-decoration: none;
    color: #e0e0e0;
    transition: all 0.3s ease;
    border: 1px solid rgba(255, 71, 87, 0.2);
}

.about-sns-link:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.3);
}

.about-sns-link.twitter:hover {
    background: linear-gradient(135deg, #1da1f2, #0d8bd9);
    border-color: #1da1f2;
}

.about-sns-link.instagram:hover {
    background: linear-gradient(135deg, #e4405f, #c13584, #833ab4);
    border-color: #e4405f;
}

.about-sns-icon {
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.about-sns-icon svg {
    width: 16px;
    height: 16px;
}

.about-profile-image {
    width: 300px;
    height: 300px;
    border-radius: 50%;
    border: 4px solid #ff6b6b;
    box-shadow:
        0 10px 30px rgba(255, 71, 87, 0.4),
        inset 0 4px 8px rgba(255, 255, 255, 0.3);
    transition: all 0.3s ease;
    object-fit: cover;
    object-position: center 30%;
    transform: scale(0.85);
}

.about-profile-image:hover {
    transform: scale(1.05) rotate(2deg);
    box-shadow:
        0 15px 40px rgba(255, 71, 87, 0.6),
        inset 0 4px 8px rgba(255, 255, 255, 0.4);
}

/* Lecture セクション */
.lecture-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.lecture-card {
    background: linear-gradient(135deg, #3a3a3a 0%, #2d2d2d 100%);
    padding: 1.8rem 1rem;
    border-radius: 15px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.3);
    text-align: center;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
    border: 1px solid rgba(255, 71, 87, 0.2);
}

.lecture-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(255, 71, 87, 0.2);
    border-color: rgba(255, 71, 87, 0.4);
}

.lecture-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, #ff6b6b, #ff8e8e, #ff6b6b);
    transition: left 0.5s ease;
}

.lecture-card:hover::before {
    left: 0;
}

.card-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.lecture-card h4 {
    font-size: 1.8rem;
    margin-bottom: 0.8rem;
    color: #ff6b6b;
    font-weight: 700;
    letter-spacing: 0.05em;
}

.lecture-time {
    font-size: 1.2rem;
    font-weight: 600;
    color: #ff6b6b;
    margin-bottom: 1.3rem;
    padding: 0.5rem 1rem;
    background: rgba(255, 107, 107, 0.1);
    border-radius: 8px;
    display: inline-block;
}

.lecture-card p {
    color: #d0d0d0;
    line-height: 1.8;
    margin-bottom: 0;
    font-size: 1.05rem;
}

/* レクチャー詳細グリッド */
.lecture-details-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.lecture-detail-card {
    background: #3a3a3a;
    padding: 1.5rem;
    border-radius: 15px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.3);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
    border: 1px solid rgba(255, 71, 87, 0.2);
}

.lecture-detail-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(255, 71, 87, 0.2);
    border-color: rgba(255, 71, 87, 0.4);
}

.lecture-detail-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: linear-gradient(180deg, #ff6b6b, #ff8e8e, #ff6b6b);
    transition: width 0.3s ease;
}

.lecture-detail-card:hover::before {
    width: 6px;
}

.lecture-number {
    position: absolute;
    top: 10px;
    right: 15px;
    font-size: 2.5rem;
    font-weight: 900;
    color: rgba(255, 71, 87, 0.15);
    line-height: 1;
}

.lecture-detail-card h4 {
    font-size: 1.2rem;
    margin-bottom: 0.8rem;
    color: #ff6b6b;
    padding-right: 2rem;
}

.lecture-detail-card p {
    color: #c0c0c0;
    line-height: 1.6;
    font-size: 0.95rem;
}

/* ボーナスカード */
.lecture-detail-card.bonus {
    background: linear-gradient(135deg, #3a3a3a, #4a3a3a);
    border-color: rgba(255, 215, 0, 0.3);
}

.lecture-detail-card.bonus::before {
    background: linear-gradient(180deg, #ffd700, #ffeb3b, #ffd700);
}

.lecture-detail-card.bonus:hover {
    box-shadow: 0 10px 25px rgba(255, 215, 0, 0.2);
    border-color: rgba(255, 215, 0, 0.5);
}

.bonus-badge {
    display: inline-block;
    background: linear-gradient(135deg, #ffd700, #ffeb3b);
    color: #1a1a1a;
    font-size: 0.7rem;
    font-weight: 700;
    padding: 2px 8px;
    border-radius: 10px;
    margin-left: 8px;
    vertical-align: middle;
}

/* レクチャー注意書き */
.lecture-notice {
    text-align: center;
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.9rem;
    margin-top: 2rem;
    font-style: italic;
}

/* 物販情報 */
.merchandise-info {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    background: linear-gradient(135deg, rgba(255, 107, 107, 0.1), rgba(255, 71, 87, 0.1));
    border: 1px solid rgba(255, 107, 107, 0.3);
    border-radius: 16px;
    padding: 1.5rem 2rem;
    margin-top: 2.5rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.merchandise-icon {
    font-size: 2.5rem;
    flex-shrink: 0;
}

.merchandise-content h4 {
    color: #ff6b6b;
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
}

.merchandise-content p {
    color: rgba(255, 255, 255, 0.85);
    font-size: 0.95rem;
    line-height: 1.6;
    margin: 0;
}

.merchandise-content strong {
    color: #ffeb3b;
    font-weight: 700;
}

@media (max-width: 480px) {
    .merchandise-info {
        flex-direction: column;
        text-align: center;
        padding: 1.5rem;
    }
}

/* レスポンシブ対応 */
@media (max-width: 768px) {
    .lecture-details-grid {
        grid-template-columns: 1fr;
    }

    .lecture-detail-card h4 {
        font-size: 1.1rem;
    }
}

/* Schedule セクション */
.schedule {
    background:
        radial-gradient(circle at 25% 25%, rgba(255, 71, 87, 0.12) 0%, transparent 35%),
        radial-gradient(circle at 75% 75%, rgba(255, 107, 107, 0.08) 0%, transparent 35%),
        #2a2a2a;
    position: relative;
}

.schedule::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(circle at 15% 15%, rgba(255, 71, 87, 0.05) 0%, transparent 25%),
        radial-gradient(circle at 85% 85%, rgba(255, 107, 107, 0.05) 0%, transparent 25%);
    pointer-events: none;
}

.schedule-timeline {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
}

.schedule-timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 4px;
    background: linear-gradient(180deg, #ff6b6b, #ff8e8e, #ff6b6b);
    transform: translateX(-50%);
}

.timeline-item {
    display: flex;
    margin-bottom: 2rem;
    position: relative;
}

.timeline-item:nth-child(odd),
.timeline-item:nth-child(even) {
    flex-direction: row;
}

.timeline-time {
    flex: 0 0 100px;
    background: #ff6b6b;
    color: white;
    padding: 1rem;
    border-radius: 10px;
    text-align: center;
    font-weight: 600;
    font-size: 1.2rem;
    position: relative;
    z-index: 2;
    display: flex;
    align-items: center;
    justify-content: center;
}

.timeline-content {
    flex: 1;
    background: #3a3a3a;
    padding: 1.5rem;
    border-radius: 10px;
    box-shadow: 0 3px 10px rgba(0,0,0,0.3);
    margin: 0 1rem;
    border: 1px solid rgba(255, 71, 87, 0.2);
}

.timeline-content h4 {
    color: #e0e0e0;
    margin-bottom: 0.5rem;
}

.timeline-content p {
    color: #c0c0c0;
}


/* Registration セクション */
.registration {
    background:
        radial-gradient(circle at 20% 20%, rgba(255, 71, 87, 0.1) 0%, transparent 40%),
        radial-gradient(circle at 80% 80%, rgba(255, 107, 107, 0.08) 0%, transparent 40%),
        #2a2a2a;
    position: relative;
}

.registration-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: start;
}

.registration-info h4 {
    font-size: 1.4rem;
    color: #e0e0e0;
    margin-bottom: 1rem;
}

.registration-info p {
    font-size: 1.1rem;
    color: #c0c0c0;
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

/* 2行に分ける */
.registration-description span {
    display: block;
}

.registration-note {
    background: rgba(255, 71, 87, 0.1);
    padding: 1.5rem;
    border-radius: 15px;
    border-left: 4px solid #ff6b6b;
    margin-top: 2rem;
}

.registration-note p {
    margin-bottom: 0.8rem;
    font-size: 1rem;
    color: #e0e0e0;
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
}

.registration-note .note-emoji {
    flex-shrink: 0;
    line-height: 1.6;
    color: #ff6b6b;
    font-size: 1.1rem;
}

.registration-note .note-text {
    flex: 1;
    line-height: 1.6;
}

.registration-note p:last-child {
    margin-bottom: 0;
}

/* モバイル表示の調整 */
@media (max-width: 768px) {
    .registration-note {
        padding: 1.2rem;
        margin-top: 1.5rem;
    }

    .registration-note p {
        font-size: 0.9rem;
        margin-bottom: 0.6rem;
        gap: 0.4rem;
    }

    .registration-note .note-emoji {
        font-size: 1.1em;
    }
}

@media (max-width: 480px) {
    .registration-note {
        padding: 1rem;
        margin-top: 1.2rem;
        border-radius: 12px;
    }

    .registration-note p {
        font-size: 0.85rem;
        margin-bottom: 0.5rem;
        gap: 0.3rem;
    }

    .registration-note .note-emoji {
        font-size: 1.1em;
    }
}

.registration-form-link {
    margin-top: 2rem;
    text-align: center;
}

/* 申し込みの輪ゴムエフェクト（PC版のみ） */
.registration-rings {
    display: none;
}

@media (min-width: 769px) {
    .registration-rings {
        display: block;
        position: relative;
        width: 100%;
        height: 280px;
        margin-top: 2rem;
        pointer-events: none;
    }

    .registration-ring {
        position: absolute;
        border: 6px solid;
        border-radius: 50%;
        opacity: 0.4;
        animation: heroRingRubberStretch 5s cubic-bezier(0.4, 0, 0.2, 1) infinite;
        box-shadow:
            0 0 20px rgba(255, 71, 87, 0.6),
            inset 0 0 20px rgba(255, 255, 255, 0.2);
        transform-origin: center;
    }

    .registration-ring::before {
        content: '';
        position: absolute;
        top: -6px;
        left: -6px;
        right: -6px;
        bottom: -6px;
        border: 3px solid rgba(255, 255, 255, 0.8);
        border-radius: 50%;
        animation: heroRingGlow 1.5s ease-in-out infinite;
    }

    .registration-ring::after {
        content: '';
        position: absolute;
        top: 50%;
        left: 50%;
        width: 4px;
        height: 4px;
        background: rgba(255, 255, 255, 0.9);
        border-radius: 50%;
        transform: translate(-50%, -50%);
        animation: heroRingDot 2s ease-in-out infinite;
    }

    .registration-ring-1 {
        width: 100px;
        height: 100px;
        border-color: rgba(255, 255, 255, 0.8);
        top: 20%;
        left: 10%;
        animation-delay: 0.5s;
    }

    .registration-ring-2 {
        width: 140px;
        height: 140px;
        border-color: rgba(255, 235, 59, 0.8);
        top: 30%;
        right: 10%;
        animation-delay: 1.5s;
    }

    .registration-ring-3 {
        width: 110px;
        height: 110px;
        border-color: rgba(255, 71, 87, 0.8);
        bottom: 10%;
        left: 40%;
        animation-delay: 2.5s;
    }
}

.registration-form {
    position: relative;
}

/* Event Info セクション */
.event-info {
    background:
        radial-gradient(circle at 25% 25%, rgba(255, 71, 87, 0.12) 0%, transparent 35%),
        radial-gradient(circle at 75% 75%, rgba(255, 107, 107, 0.08) 0%, transparent 35%),
        #2a2a2a;
    position: relative;
}

.event-info-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: start;
}

.event-info-column {
    display: flex;
    flex-direction: column;
    position: relative;
}

/* イベント情報の輪ゴムエフェクト（PC版のみ） */
.event-info-rings {
    display: none;
}

@media (min-width: 769px) {
    .event-info-rings {
        display: block;
        position: relative;
        width: 100%;
        height: 280px;
        margin-top: 2rem;
        pointer-events: none;
    }

    .event-ring {
        position: absolute;
        border: 6px solid;
        border-radius: 50%;
        opacity: 0.4;
        animation: heroRingRubberStretch 5s cubic-bezier(0.4, 0, 0.2, 1) infinite;
        box-shadow:
            0 0 20px rgba(255, 71, 87, 0.6),
            inset 0 0 20px rgba(255, 255, 255, 0.2);
        transform-origin: center;
    }

    .event-ring::before {
        content: '';
        position: absolute;
        top: -6px;
        left: -6px;
        right: -6px;
        bottom: -6px;
        border: 3px solid rgba(255, 255, 255, 0.8);
        border-radius: 50%;
        animation: heroRingGlow 1.5s ease-in-out infinite;
    }

    .event-ring::after {
        content: '';
        position: absolute;
        top: 50%;
        left: 50%;
        width: 4px;
        height: 4px;
        background: rgba(255, 255, 255, 0.9);
        border-radius: 50%;
        transform: translate(-50%, -50%);
        animation: heroRingDot 2s ease-in-out infinite;
    }

    .event-ring-1 {
        width: 100px;
        height: 100px;
        border-color: rgba(255, 255, 255, 0.8);
        top: 20%;
        left: 10%;
        animation-delay: 0s;
    }

    .event-ring-2 {
        width: 140px;
        height: 140px;
        border-color: rgba(255, 235, 59, 0.8);
        top: 30%;
        right: 10%;
        animation-delay: 1s;
    }

    .event-ring-3 {
        width: 110px;
        height: 110px;
        border-color: rgba(255, 71, 87, 0.8);
        bottom: 10%;
        left: 40%;
        animation-delay: 2s;
    }
}

.event-info-details {
    background: rgba(58, 58, 58, 0.6);
    padding: 2.5rem;
    border-radius: 20px;
    border: 1px solid rgba(255, 71, 87, 0.3);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
}

.event-info-details .contact-info-item {
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid rgba(255, 71, 87, 0.15);
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.event-info-details .contact-info-item:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.event-info-details .contact-label {
    display: block;
    font-size: 1rem;
    font-weight: 700;
    color: #ff6b6b;
    margin-bottom: 0;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid rgba(255, 107, 107, 0.3);
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.event-info-details .contact-value {
    display: block;
    font-size: 1.2rem;
    line-height: 1.6;
    color: #e0e0e0;
    font-weight: 500;
    margin-top: 0;
    word-break: keep-all;
}

.event-info-map h4,
.event-info-heading {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    color: #e0e0e0;
    font-weight: 600;
    text-align: center;
    padding-bottom: 1rem;
    border-bottom: 2px solid rgba(255, 71, 87, 0.3);
}

.map-container {
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(255, 71, 87, 0.3);
    margin-bottom: 1.5rem;
    transition: all 0.3s ease;
}

.map-container:hover {
    box-shadow: 0 12px 35px rgba(255, 71, 87, 0.2);
    border-color: rgba(255, 71, 87, 0.5);
}

.google-map {
    width: 100%;
    height: 400px;
    border: none;
    display: block;
}

.map-note {
    text-align: center;
    margin-top: 1rem;
}

.map-link {
    color: #e0e0e0;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    border-bottom: 1px solid transparent;
}

.map-link:hover {
    color: #ff6b6b;
    border-bottom-color: #ff6b6b;
}

/* アクセス案内 */
.access-instructions {
    margin-top: 2rem;
    padding: 1.5rem;
    background: rgba(58, 58, 58, 0.6);
    border-radius: 15px;
    border: 1px solid rgba(255, 71, 87, 0.3);
}

.access-instructions h5 {
    font-size: 1.1rem;
    color: #ff6b6b;
    margin-bottom: 1rem;
    font-weight: 600;
}

.access-instructions ol {
    margin: 0;
    padding-left: 1.5rem;
    color: #e0e0e0;
}

.access-instructions li {
    margin-bottom: 0.8rem;
    line-height: 1.6;
}

.access-instructions li:last-child {
    margin-bottom: 0;
}

.access-warning {
    margin-top: 1rem;
    padding: 0.8rem 1rem;
    background: rgba(255, 71, 87, 0.15);
    border-left: 3px solid #ff6b6b;
    border-radius: 0 8px 8px 0;
    color: #ff8e8e;
    font-size: 0.95rem;
    line-height: 1.5;
}

/* レクチャー教材 */
.lecture-materials {
    margin-top: 1rem;
    padding: 0.5rem 1rem;
    background: rgba(255, 215, 0, 0.15);
    border: 1px solid rgba(255, 215, 0, 0.3);
    border-radius: 8px;
    color: #ffd700;
    font-weight: 600;
    display: inline-block;
}

/* Contact セクション */
.contact {
    background:
        radial-gradient(circle at 20% 20%, rgba(255, 71, 87, 0.1) 0%, transparent 40%),
        radial-gradient(circle at 80% 80%, rgba(255, 107, 107, 0.08) 0%, transparent 40%),
        #2a2a2a;
    position: relative;
    padding: 2rem 0;
}

.contact-content {
    display: flex;
    justify-content: center;
    align-items: center;
    max-width: 600px;
    margin: 0 auto;
}

.contact-card {
    background: transparent;
    padding: 2rem;
    text-align: center;
    width: 100%;
    max-width: 600px;
    margin: 0 auto;
    box-sizing: border-box;
}

@media (max-width: 480px) {
    .contact-card {
        padding: 1rem;
    }

    .contact-method {
        padding: 1rem;
    }
}

.contact-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.contact-card h4 {
    font-size: 1.3rem;
    margin-bottom: 1rem;
    color: #e0e0e0;
    font-weight: 600;
}

.contact-description {
    font-size: 1rem;
    color: #c0c0c0;
    line-height: 1.8;
    margin-bottom: 2rem;
    text-align: center;
    padding: 0 1rem;
}

@media (min-width: 769px) {
    .contact-description {
        white-space: nowrap;
        padding: 0;
    }
}

.contact-info-item {
    margin-top: 0;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.contact-method {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.8rem;
    padding: 1.5rem;
    background: rgba(58, 58, 58, 0.4);
    border-radius: 12px;
    border: 1px solid rgba(255, 71, 87, 0.2);
    transition: all 0.3s ease;
    width: 100%;
    max-width: 100%;
    box-sizing: border-box;
}

@media (min-width: 769px) {
    .contact-info-item {
        flex-direction: row;
        justify-content: center;
        gap: 2rem;
    }

    .contact-method {
        flex: 0 1 auto;
        width: auto;
        max-width: none;
        min-width: auto;
    }

    .contact-email {
        white-space: nowrap;
        word-break: normal;
    }
}

.contact-method {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.8rem;
    padding: 1.5rem;
    background: rgba(58, 58, 58, 0.4);
    border-radius: 12px;
    border: 1px solid rgba(255, 71, 87, 0.2);
    transition: all 0.3s ease;
}

.contact-method:hover {
    background: rgba(58, 58, 58, 0.6);
    border-color: rgba(255, 71, 87, 0.4);
    transform: translateY(-2px);
}

.contact-method-label {
    font-size: 0.95rem;
    color: #ff6b6b;
    font-weight: 600;
    letter-spacing: 0.05em;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.contact-method-label i {
    font-size: 1.1rem;
    color: #ffffff;
}

.contact-link {
    color: #ffffff;
    text-decoration: none;
    font-size: 1.15rem;
    font-weight: 500;
    transition: all 0.3s ease;
    display: inline-block;
    padding: 0.6rem 1.2rem;
    border-radius: 8px;
    background: rgba(255, 107, 107, 0.1);
    border: 1px solid rgba(255, 107, 107, 0.3);
}

.contact-link:hover {
    color: #ffffff;
    background: rgba(255, 107, 107, 0.2);
    border-color: rgba(255, 107, 107, 0.5);
    transform: scale(1.05);
}

.contact-name {
    font-size: 1.1rem;
    color: #e0e0e0;
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.contact-email {
    color: #ffffff;
    text-decoration: none;
    font-size: 1.15rem;
    font-weight: 500;
    transition: all 0.3s ease;
    display: inline-block;
    padding: 0.6rem 1.2rem;
    border-radius: 8px;
    background: rgba(255, 107, 107, 0.1);
    border: 1px solid rgba(255, 107, 107, 0.3);
    box-sizing: border-box;
    max-width: 100%;
    word-break: break-all;
}

.contact-email:hover {
    color: #fff;
    background: rgba(255, 107, 107, 0.2);
    border-color: rgba(255, 107, 107, 0.5);
    transform: scale(1.05);
}

@media (max-width: 480px) {
    .contact-email {
        font-size: 0.95rem;
        padding: 0.5rem 0.8rem;
    }
}

.venue-address {
    display: block;
    color: #e0e0e0;
    font-size: 1.1rem;
    line-height: 1.8;
    margin-bottom: 0.2rem;
}

.venue-building {
    color: #e0e0e0;
    font-weight: normal;
}

.venue-floor-room {
    display: block;
    color: #e0e0e0;
    font-size: 1.1rem;
    line-height: 1.8;
}

/* Googleフォームスタイル */
.google-form {
    border-radius: 20px;
    box-shadow: 0 15px 40px rgba(0,0,0,0.2);
    border: 2px solid rgba(255, 71, 87, 0.3);
    transition: all 0.3s ease;
    background: linear-gradient(135deg, rgba(255, 71, 87, 0.05), rgba(255, 107, 107, 0.05));
    position: relative;
    overflow: hidden;
}

.google-form::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #ff6b6b, #ff4757, #ff2d55);
    z-index: 1;
}

.google-form:hover {
    box-shadow: 0 20px 50px rgba(255, 71, 87, 0.3);
    border-color: rgba(255, 71, 87, 0.5);
    transform: translateY(-2px);
}

.google-form iframe {
    border-radius: 18px;
    border: none;
}

/* 画面全体のビヨンビヨンエフェクト */
@keyframes screenBounce {
    0% { transform: scale(1) rotate(0deg); }
    10% { transform: scale(1.02) rotate(0.5deg); }
    20% { transform: scale(0.98) rotate(-0.5deg); }
    30% { transform: scale(1.03) rotate(0.3deg); }
    40% { transform: scale(0.97) rotate(-0.3deg); }
    50% { transform: scale(1.01) rotate(0.2deg); }
    60% { transform: scale(0.99) rotate(-0.2deg); }
    70% { transform: scale(1.02) rotate(0.1deg); }
    80% { transform: scale(0.98) rotate(-0.1deg); }
    90% { transform: scale(1.01) rotate(0.05deg); }
    100% { transform: scale(1) rotate(0deg); }
}

@keyframes screenShake {
    0%, 100% { transform: translateX(0); }
    10% { transform: translateX(-2px) translateY(-1px); }
    20% { transform: translateX(2px) translateY(1px); }
    30% { transform: translateX(-1px) translateY(-2px); }
    40% { transform: translateX(1px) translateY(2px); }
    50% { transform: translateX(-2px) translateY(1px); }
    60% { transform: translateX(2px) translateY(-1px); }
    70% { transform: translateX(-1px) translateY(2px); }
    80% { transform: translateX(1px) translateY(-2px); }
    90% { transform: translateX(-1px) translateY(1px); }
}

@keyframes colorFlash {
    0% { filter: hue-rotate(0deg) saturate(1); }
    25% { filter: hue-rotate(90deg) saturate(1.5); }
    50% { filter: hue-rotate(180deg) saturate(2); }
    75% { filter: hue-rotate(270deg) saturate(1.5); }
    100% { filter: hue-rotate(360deg) saturate(1); }
}

@keyframes rubberWave {
    0% { transform: scaleY(1); }
    25% { transform: scaleY(1.1); }
    50% { transform: scaleY(0.9); }
    75% { transform: scaleY(1.05); }
    100% { transform: scaleY(1); }
}

@keyframes horizontalStretch {
    0% { transform: scaleX(1) scaleY(1); }
    15% { transform: scaleX(1.15) scaleY(0.95); }
    30% { transform: scaleX(0.85) scaleY(1.1); }
    45% { transform: scaleX(1.1) scaleY(0.9); }
    60% { transform: scaleX(0.9) scaleY(1.05); }
    75% { transform: scaleX(1.05) scaleY(0.95); }
    90% { transform: scaleX(0.95) scaleY(1.02); }
    100% { transform: scaleX(1) scaleY(1); }
}

@keyframes diagonalBounce {
    0% { transform: scale(1) rotate(0deg); }
    10% { transform: scale(1.08) rotate(1deg); }
    20% { transform: scale(0.92) rotate(-1deg); }
    30% { transform: scale(1.12) rotate(0.8deg); }
    40% { transform: scale(0.88) rotate(-0.8deg); }
    50% { transform: scale(1.06) rotate(0.5deg); }
    60% { transform: scale(0.94) rotate(-0.5deg); }
    70% { transform: scale(1.04) rotate(0.3deg); }
    80% { transform: scale(0.96) rotate(-0.3deg); }
    90% { transform: scale(1.02) rotate(0.1deg); }
    100% { transform: scale(1) rotate(0deg); }
}

/* ビヨンビヨンエフェクト用のクラス */
.body-bounce {
    animation: screenBounce 1.2s ease-in-out;
}

.body-shake {
    animation: screenShake 1s ease-in-out;
}

.body-color-flash {
    animation: colorFlash 1.5s ease-in-out;
}

.body-rubber-wave {
    animation: rubberWave 0.8s ease-in-out;
}

.body-horizontal-stretch {
    animation: horizontalStretch 1.4s ease-in-out;
}

.body-diagonal-bounce {
    animation: diagonalBounce 1.6s ease-in-out;
}

/* 追加のアニメーション */
@keyframes screenWave {
    0% {
        width: 0;
        height: 0;
        opacity: 1;
    }
    100% {
        width: 400px;
        height: 400px;
        opacity: 0;
    }
}

@keyframes horizontalWave {
    0% {
        width: 0;
        opacity: 0;
    }
    20% {
        width: 100%;
        opacity: 1;
    }
    80% {
        width: 100%;
        opacity: 0.8;
    }
    100% {
        width: 100%;
        opacity: 0;
    }
}

/* イースターエッグ: びよーんボタン */
.easter-egg {
    margin-top: 1.5rem;
    text-align: center;
    opacity: 0.7;
    transition: all 0.3s ease;
}

.easter-egg:hover {
    opacity: 1;
    transform: scale(1.05);
}

.easter-egg-btn {
    background: linear-gradient(135deg, #ff6b6b, #ff4757);
    border: none;
    border-radius: 50px;
    padding: 12px 20px;
    color: white;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    position: relative;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(255, 107, 107, 0.3);
    transition: all 0.3s ease;
    font-family: 'Noto Sans JP', sans-serif;
}

.easter-egg-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(255, 107, 107, 0.4);
    background: linear-gradient(135deg, #ff4757, #ff2d55);
}

.easter-egg-btn:active {
    transform: translateY(0);
    box-shadow: 0 2px 10px rgba(255, 107, 107, 0.3);
}

.easter-egg-text {
    position: relative;
    z-index: 2;
    display: block;
}

.easter-egg-rubber-band {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(45deg, transparent 30%, rgba(255, 255, 255, 0.2) 50%, transparent 70%);
    transform: translateX(-100%);
    transition: transform 0.6s ease;
}

.easter-egg-btn:hover .easter-egg-rubber-band {
    transform: translateX(100%);
}

/* モバイルでのイースターエッグ */
@media (max-width: 768px) {
    .easter-egg {
        margin-top: 1rem;
    }

    .easter-egg-btn {
        padding: 10px 16px;
        font-size: 0.8rem;
    }
}

/* フッター */
.footer {
    background: #333;
    color: white;
    text-align: center;
    padding: 2rem 0;
    position: relative;
}

.footer p {
    margin-bottom: 0.5rem;
    color: #e0e0e0;
}

.footer-powered {
    font-size: 0.9rem;
    color: #c0c0c0;
    margin-top: 0.5rem;
}

.footer-link {
    color: #ff6b6b;
    text-decoration: none;
    transition: all 0.3s ease;
    font-weight: 500;
}

.footer-link:hover {
    color: #ff8e8e;
    text-decoration: underline;
}

.footer-rubber-bands {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-top: 1rem;
}

.rubber-band-small {
    width: 30px;
    height: 4px;
    background: linear-gradient(90deg, #ff6b6b, #ff8e8e, #ff6b6b);
    border-radius: 2px;
    animation: rubberBounce 2s ease-in-out infinite;
}

.rubber-band-small:nth-child(2) {
    animation-delay: 0.3s;
}

.rubber-band-small:nth-child(3) {
    animation-delay: 0.6s;
}

@keyframes rubberBounce {
    0%, 100% { transform: scaleY(1); }
    50% { transform: scaleY(1.5); }
}

/* 輪ゴム破片エフェクトのアニメーション */
@keyframes rubberVibration {
    0% {
        transform: scale(0);
        opacity: 0;
    }
    50% {
        transform: scale(1.2);
        opacity: 0.8;
    }
    100% {
        transform: scale(1);
        opacity: 0;
    }
}

@keyframes rubberFragment0 {
    0% { transform: translate(-50%, -50%) scale(1) rotate(0deg); opacity: 1; }
    100% { transform: translate(-200px, -150px) scale(0.3) rotate(180deg); opacity: 0; }
}

@keyframes rubberFragment1 {
    0% { transform: translate(-50%, -50%) scale(1) rotate(0deg); opacity: 1; }
    100% { transform: translate(200px, -150px) scale(0.3) rotate(-180deg); opacity: 0; }
}

@keyframes rubberFragment2 {
    0% { transform: translate(-50%, -50%) scale(1) rotate(0deg); opacity: 1; }
    100% { transform: translate(-150px, 150px) scale(0.3) rotate(90deg); opacity: 0; }
}

@keyframes rubberFragment3 {
    0% { transform: translate(-50%, -50%) scale(1) rotate(0deg); opacity: 1; }
    100% { transform: translate(150px, 150px) scale(0.3) rotate(-90deg); opacity: 0; }
}

@keyframes rubberFragment4 {
    0% { transform: translate(-50%, -50%) scale(1) rotate(0deg); opacity: 1; }
    100% { transform: translate(-100px, -200px) scale(0.3) rotate(45deg); opacity: 0; }
}

@keyframes rubberFragment5 {
    0% { transform: translate(-50%, -50%) scale(1) rotate(0deg); opacity: 1; }
    100% { transform: translate(100px, -200px) scale(0.3) rotate(-45deg); opacity: 0; }
}

@keyframes rubberFragment6 {
    0% { transform: translate(-50%, -50%) scale(1) rotate(0deg); opacity: 1; }
    100% { transform: translate(-100px, 200px) scale(0.3) rotate(135deg); opacity: 0; }
}

@keyframes rubberFragment7 {
    0% { transform: translate(-50%, -50%) scale(1) rotate(0deg); opacity: 1; }
    100% { transform: translate(100px, 200px) scale(0.3) rotate(-135deg); opacity: 0; }
}

/* 輪っか装飾要素 */
.rubber-rings-container {
    display: none;
}

.rubber-ring {
    position: absolute;
    border: 3px solid;
    border-radius: 50%;
    opacity: 0.1;
    animation: ringFloat 8s ease-in-out infinite;
}

.rubber-ring::before {
    content: '';
    position: absolute;
    top: -3px;
    left: -3px;
    right: -3px;
    bottom: -3px;
    border: 1px solid rgba(255, 71, 87, 0.3);
    border-radius: 50%;
    animation: ringPulse 3s ease-in-out infinite;
}

.ring-1 {
    width: 100px;
    height: 100px;
    border-color: #ff4757;
    top: 20%;
    left: 10%;
    animation-delay: 0s;
}

.ring-2 {
    width: 150px;
    height: 150px;
    border-color: #ff6b6b;
    top: 60%;
    right: 15%;
    animation-delay: 2s;
}

.ring-3 {
    width: 80px;
    height: 80px;
    border-color: #ff8e8e;
    bottom: 30%;
    left: 20%;
    animation-delay: 4s;
}

.ring-4 {
    width: 120px;
    height: 120px;
    border-color: #ff4757;
    top: 40%;
    left: 50%;
    animation-delay: 1s;
}

.ring-5 {
    width: 200px;
    height: 200px;
    border-color: #ff6b6b;
    bottom: 10%;
    right: 30%;
    animation-delay: 3s;
}

@keyframes ringFloat {
    0%, 100% {
        transform: translateY(0) rotate(0deg) scale(1);
        opacity: 0.1;
    }
    25% {
        transform: translateY(-20px) rotate(90deg) scale(1.1);
        opacity: 0.2;
    }
    50% {
        transform: translateY(-10px) rotate(180deg) scale(0.9);
        opacity: 0.15;
    }
    75% {
        transform: translateY(-15px) rotate(270deg) scale(1.05);
        opacity: 0.2;
    }
}

@keyframes ringPulse {
    0%, 100% {
        transform: scale(1);
        opacity: 0.3;
    }
    50% {
        transform: scale(1.2);
        opacity: 0.6;
    }
}

/* ヒーローセクションの輪っか */
.hero-rings {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

.hero-ring {
    position: absolute;
    border: 6px solid;
    border-radius: 50%;
    opacity: 0.4;
    animation: heroRingRubberStretch 5s cubic-bezier(0.4, 0, 0.2, 1) infinite;
    box-shadow:
        0 0 20px rgba(255, 71, 87, 0.6),
        inset 0 0 20px rgba(255, 255, 255, 0.2);
    transform-origin: center;
}

.hero-ring::before {
    content: '';
    position: absolute;
    top: -6px;
    left: -6px;
    right: -6px;
    bottom: -6px;
    border: 3px solid rgba(255, 255, 255, 0.8);
    border-radius: 50%;
    animation: heroRingGlow 1.5s ease-in-out infinite;
}

.hero-ring::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 4px;
    height: 4px;
    background: rgba(255, 255, 255, 0.9);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    animation: heroRingDot 2s ease-in-out infinite;
}

.hero-ring-1 {
    width: 100px;
    height: 100px;
    border-color: rgba(255, 255, 255, 0.8);
    top: 15%;
    left: 15%;
    animation-delay: 0s;
}

.hero-ring-2 {
    width: 150px;
    height: 150px;
    border-color: rgba(255, 235, 59, 0.8);
    top: 45%;
    right: 15%;
    animation-delay: 1s;
}

.hero-ring-3 {
    width: 120px;
    height: 120px;
    border-color: rgba(255, 71, 87, 0.8);
    bottom: 15%;
    left: 45%;
    animation-delay: 2s;
}

@keyframes heroRingRubberStretch {
    0%, 100% {
        transform: scaleX(1) scaleY(1);
        filter: brightness(1);
    }
    /* 横に伸ばす（ゆっくり） */
    20% {
        transform: scaleX(1.5) scaleY(0.6);
        filter: brightness(1.2);
    }
    /* 戻る（早め） */
    35% {
        transform: scaleX(0.95) scaleY(1.05);
        filter: brightness(1);
    }
    /* プルプル1 */
    40% {
        transform: scaleX(1.05) scaleY(0.98);
        filter: brightness(1.05);
    }
    /* プルプル2 */
    45% {
        transform: scaleX(0.98) scaleY(1.02);
        filter: brightness(1);
    }
    /* プルプル3 */
    50% {
        transform: scaleX(1.01) scaleY(1);
        filter: brightness(1);
    }
    /* 縦に伸ばす（ゆっくり） */
    70% {
        transform: scaleX(0.6) scaleY(1.5);
        filter: brightness(1.2);
    }
    /* 戻る（早め） */
    85% {
        transform: scaleX(1.05) scaleY(0.95);
        filter: brightness(1);
    }
    /* プルプル1 */
    88% {
        transform: scaleX(0.98) scaleY(1.05);
        filter: brightness(1.05);
    }
    /* プルプル2 */
    91% {
        transform: scaleX(1.02) scaleY(0.98);
        filter: brightness(1);
    }
    /* プルプル3 */
    94% {
        transform: scaleX(1) scaleY(1);
        filter: brightness(1);
    }
}

@keyframes heroRingGlow {
    0%, 100% {
        opacity: 0.8;
        transform: scale(1);
    }
    50% {
        opacity: 1;
        transform: scale(1.2);
    }
}

@keyframes heroRingDot {
    0%, 100% {
        opacity: 0.5;
        transform: translate(-50%, -50%) scale(1);
    }
    50% {
        opacity: 1;
        transform: translate(-50%, -50%) scale(1.5);
    }
}

/* ヒーローパーティクル */
.hero-particles {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

.particle {
    position: absolute;
    width: 4px;
    height: 4px;
    background: rgba(255, 71, 87, 0.8);
    border-radius: 50%;
    animation: particleFloat 6s ease-in-out infinite;
    box-shadow: 0 0 10px rgba(255, 71, 87, 0.6);
}

.particle-1 {
    top: 20%;
    left: 10%;
    animation-delay: 0s;
}

.particle-2 {
    top: 60%;
    left: 20%;
    animation-delay: 1s;
}

.particle-3 {
    top: 30%;
    right: 15%;
    animation-delay: 2s;
}

.particle-4 {
    bottom: 25%;
    left: 30%;
    animation-delay: 3s;
}

.particle-5 {
    top: 70%;
    right: 25%;
    animation-delay: 4s;
}

.particle-6 {
    bottom: 40%;
    right: 10%;
    animation-delay: 5s;
}

@keyframes particleFloat {
    0%, 100% {
        transform: translateY(0) translateX(0) scale(1);
        opacity: 0.6;
    }
    25% {
        transform: translateY(-30px) translateX(20px) scale(1.2);
        opacity: 1;
    }
    50% {
        transform: translateY(-15px) translateX(-10px) scale(0.8);
        opacity: 0.8;
    }
    75% {
        transform: translateY(-25px) translateX(15px) scale(1.1);
        opacity: 0.9;
    }
}

/* 輪っかパーティクル */
.rubber-particles {
    display: none;
}

.rubber-particle {
    position: absolute;
    width: 8px;
    height: 8px;
    border: 2px solid #ff4757;
    border-radius: 50%;
    background: rgba(255, 71, 87, 0.3);
    animation: particleFloat 4s ease-in-out infinite;
}

@keyframes particleFloat {
    0%, 100% {
        transform: translateY(0) rotate(0deg) scale(1);
        opacity: 0.3;
    }
    25% {
        transform: translateY(-20px) rotate(90deg) scale(1.2);
        opacity: 0.6;
    }
    50% {
        transform: translateY(-10px) rotate(180deg) scale(0.8);
        opacity: 0.4;
    }
    75% {
        transform: translateY(-15px) rotate(270deg) scale(1.1);
        opacity: 0.5;
    }
}

@keyframes randomRingFloat {
    0%, 100% {
        transform: translateY(0) rotate(0deg) scale(1);
        opacity: 0.2;
    }
    20% {
        transform: translateY(-30px) rotate(72deg) scale(1.3);
        opacity: 0.5;
    }
    40% {
        transform: translateY(-15px) rotate(144deg) scale(0.7);
        opacity: 0.3;
    }
    60% {
        transform: translateY(-25px) rotate(216deg) scale(1.1);
        opacity: 0.4;
    }
    80% {
        transform: translateY(-20px) rotate(288deg) scale(0.9);
        opacity: 0.3;
    }
}

/* レスポンシブデザイン */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }

    .hero {
        flex-direction: column;
        text-align: center;
        padding-top: 90px;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }

    .registration-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .event-info-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .event-info-column,
    .event-info-details {
        max-width: 100%;
        box-sizing: border-box;
    }

    .event-info-details {
        padding: 1.5rem;
        text-align: center;
    }

    .event-info-details .contact-value {
        word-break: normal;
        overflow-wrap: break-word;
    }

    .google-map {
        height: 300px;
    }

    .contact-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .about-content {
        grid-template-columns: 1fr;
        grid-template-areas:
            "image"
            "text";
    }

    .about-image {
        grid-area: image;
        display: flex;
        justify-content: center;
    }

    .about-text {
        grid-area: text;
        text-align: center;
    }

    .schedule-timeline::before {
        left: 30px;
    }

    .timeline-item {
        flex-direction: column !important;
        padding-left: 60px;
    }

    .timeline-time {
        position: absolute;
        left: 0;
        width: 60px;
        height: 60px;
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 0.8rem;
    }

    .timeline-content {
        margin: 0;
    }

    .about-sns-links {
        flex-direction: column;
        gap: 0.8rem;
    }

    .about-profile-image {
        width: 250px;
        height: 250px;
    }

    .google-form {
        height: 700px;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }

    .section-title {
        font-size: 2rem;
    }

    .lecture-grid {
        grid-template-columns: 1fr;
    }
}