/* ==================== CSS Variables ==================== */
:root {
    /* Colors */
    --brand-primary: #55babd;
    --brand-primary-dark: #4da9ac;
    --brand-primary-light: #6fcacf;
    --brand-secondary: #0c5679;
    --brand-secondary-dark: #094561;
    --color-white: #ffffff;
    --color-black: #333333;
    --color-gray: #666666;
    --color-gray-light: #999999;
    --color-light-gray: #f5f5f5;
    --color-border: #e0e0e0;
    --color-border-light: #eeeeee;
    
    /* Shadows - 分层阴影系统 */
    --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.08), 0 2px 4px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.1), 0 4px 8px rgba(0, 0, 0, 0.06);
    --shadow-xl: 0 12px 24px rgba(0, 0, 0, 0.12), 0 6px 12px rgba(0, 0, 0, 0.08);
    --shadow-brand: 0 6px 20px rgba(85, 186, 189, 0.25), 0 3px 8px rgba(0, 0, 0, 0.08);
    --color-overlay: rgba(0, 0, 0, 0.5);
    
    /* Typography */
    --font-base: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft JhengHei", "微軟正黑體", "PingFang TC", "Noto Sans TC", sans-serif;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    
    /* Spacing - 更精确的间距系统 */
    --spacing-xs: 8px;
    --spacing-sm: 12px;
    --spacing-md: 18px;
    --spacing-lg: 26px;
    --spacing-xl: 36px;
    --spacing-xxl: 48px;
    
    /* Border Radius */
    --border-radius: 14px;
    --border-radius-sm: 10px;
    --border-radius-lg: 22px;
    --border-radius-xl: 28px;
    
    /* Transitions */
    --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Z-index */
    --z-nav: 1000;
    --z-modal: 2000;
    --z-fixed-btn: 100;
    --z-dropdown: 50;
    
    /* Container */
    --container-max: 1200px;
    --container-padding: var(--spacing-md);
}

/* ==================== Reset & Base Styles ==================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
    -webkit-tap-highlight-color: transparent;
    text-size-adjust: 100%;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-base);
    color: var(--color-black);
    line-height: 1.65;
    background-image: url('../../src/img/bg/bg-pc.png');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    background-repeat: no-repeat;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    font-weight: var(--font-weight-normal);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
    image-rendering: -webkit-optimize-contrast;
    image-rendering: crisp-edges;
}

/* 懒加载优化 */
img[loading="lazy"] {
    background: var(--color-light-gray);
}

picture {
    display: block;
    line-height: 0;
}

a {
    text-decoration: none;
    color: inherit;
}

button {
    border: none;
    background: none;
    cursor: pointer;
    font-family: inherit;
}

ul, ol {
    list-style-position: inside;
}

/* ==================== Navigation Bar ==================== */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background-color: transparent;
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    box-shadow: none;
    z-index: var(--z-nav);
    padding: var(--spacing-sm) 0;
    border-bottom: none;
    transition: background-color 0.3s ease, backdrop-filter 0.3s ease, box-shadow 0.3s ease;
    will-change: background-color, backdrop-filter;
}

.navbar .nav-container {
    opacity: 0;
    transition: opacity 0.3s ease;
}

.navbar.scrolled {
    background-color: rgba(255, 255, 255, 0.88);
    backdrop-filter: blur(10px) saturate(180%);
    -webkit-backdrop-filter: blur(10px) saturate(180%);
    box-shadow: var(--shadow-sm);
    border-bottom: 1px solid var(--color-border-light);
}

.navbar.scrolled .nav-container {
    opacity: 1;
}

.nav-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 100%;
}

.nav-logo {
    display: inline-block;
    transition: var(--transition);
}

.nav-logo:hover {
    opacity: 0.85;
    transform: translateY(-1px);
}

.nav-logo img {
    height: 50px;
    width: auto;
    display: block;
}

.nav-social {
    display: flex;
    gap: var(--spacing-sm);
    align-items: center;
}

.social-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.social-btn img {
    height: 40px;
    width: auto;
}

.social-btn:hover {
    transform: translateY(-1px) scale(1.05);
    opacity: 0.85;
}

/* ==================== Banner Section ==================== */
.banner {
    width: 100%;
    background-color: var(--color-light-gray);
}

.banner-img {
    width: 100%;
    height: auto;
    display: block;
}

/* ==================== Main Content ==================== */
.main-content {
    background-image: url('../../src/img/bg/bg-pc.png');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    background-repeat: no-repeat;
    min-height: 100vh;
    padding: var(--spacing-xl) 0 var(--spacing-lg);
    flex: 1;
    contain: layout style paint;
}

/* ==================== Section Styles ==================== */
.section {
    max-width: var(--container-max);
    margin: 0 auto var(--spacing-xl);
    padding: 0 var(--container-padding);
    contain: layout style;
}

.section:last-child {
    margin-bottom: var(--spacing-lg);
}

.section-title {
    text-align: center;
    margin-bottom: var(--spacing-md);
    padding: var(--spacing-md) var(--spacing-lg) 0;
}

.section-title img {
    max-width: 500px;
    margin: 0 auto;
    transition: transform var(--transition-slow);
}

.section-title img:hover {
    transform: scale(1.02);
}

/* ==================== Activity Introduction Section ==================== */
.activity-intro {
    border-radius: var(--border-radius-lg);
    padding: 2px;
    background: var(--brand-primary);
    box-shadow: var(--shadow-brand);
    position: relative;
    transform: translateZ(0);
    overflow: hidden;
}

.activity-intro::after {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
    pointer-events: none;
    z-index: 0;
}

.activity-intro::before {
    content: '';
    position: absolute;
    inset: 2px;
    border-radius: calc(var(--border-radius-lg) - 2px);
    background: #ffffff;
    z-index: 0;
}

.activity-intro > * {
    position: relative;
    z-index: 1;
}

.intro-content {
    text-align: center;
    padding: var(--spacing-lg) var(--spacing-md) var(--spacing-xl);
}

.intro-image {
    margin-bottom: var(--spacing-md);
}

.intro-image img {
    width: 100%;
    height: auto;
    display: block;
}

.intro-text {
    font-size: 1.0625rem;
    line-height: 1.85;
    color: var(--color-black);
    margin-bottom: var(--spacing-lg);
    font-weight: var(--font-weight-medium);
    letter-spacing: 0.02em;
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
}

.intro-text .highlight {
    color: var(--brand-primary);
    font-weight: var(--font-weight-bold);
    position: relative;
}

.intro-text .emphasis {
    color: var(--brand-secondary);
    font-weight: var(--font-weight-bold);
    position: relative;
}

.cta-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
    margin-top: var(--spacing-md);
}

.cta-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 13px var(--spacing-lg);
    border-radius: var(--border-radius);
    font-size: 1.0625rem;
    font-weight: var(--font-weight-semibold);
    transition: transform var(--transition), box-shadow var(--transition), background-color var(--transition);
    min-width: 220px;
    box-shadow: var(--shadow-sm);
    position: relative;
    overflow: hidden;
    cursor: pointer;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
}

.cta-btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.25);
    transform: translate(-50%, -50%);
    transition: width 0.6s cubic-bezier(0.4, 0, 0.2, 1), height 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.cta-btn:active::before {
    width: 400px;
    height: 400px;
    transition: width 0.3s cubic-bezier(0.4, 0, 0.2, 1), height 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.cta-btn:hover::before {
    width: 320px;
    height: 320px;
}

.cta-btn:active {
    transform: translateY(0) scale(0.98);
}

.cta-btn span {
    position: relative;
    z-index: 1;
}

.cta-btn-primary {
    background: var(--brand-primary);
    color: var(--color-white);
}

.cta-btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-brand);
    background: var(--brand-primary-dark);
}

.cta-btn-secondary {
    background-color: var(--color-white);
    color: var(--brand-secondary);
    border: 2px solid var(--brand-primary);
}

.cta-btn-secondary:hover {
    background-color: var(--brand-primary);
    color: var(--color-white);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--brand-primary);
}

/* ==================== Season Section ==================== */
.season-section {
    border-radius: var(--border-radius-lg);
    padding: 2px;
    background: var(--brand-primary);
    box-shadow: var(--shadow-brand);
    position: relative;
    transform: translateZ(0);
    overflow: hidden;
}

.season-section::after {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
    pointer-events: none;
    z-index: 0;
}

.season-section::before {
    content: '';
    position: absolute;
    inset: 2px;
    border-radius: calc(var(--border-radius-lg) - 2px);
    background: #ffffff;
    z-index: 0;
}

.season-section > * {
    position: relative;
    z-index: 1;
}

.season-info {
    text-align: center;
    margin-bottom: var(--spacing-md);
    padding: 0 var(--spacing-md);
}

.season-period {
    font-size: 1.0625rem;
    font-weight: var(--font-weight-semibold);
    color: var(--brand-secondary);
    background-color: rgba(245, 245, 245, 0.95);
    display: inline-block;
    padding: 10px var(--spacing-lg);
    border-radius: var(--border-radius);
    border: 1px solid rgba(85, 186, 189, 0.2);
    box-shadow: var(--shadow-xs);
    transition: var(--transition);
}

.season-period:hover {
    background-color: rgba(245, 245, 245, 1);
    box-shadow: var(--shadow-sm);
}

/* ==================== Prizes Container ==================== */
.prizes-container {
    margin-bottom: var(--spacing-lg);
    padding: 0 var(--spacing-md);
}

.prizes-title {
    font-size: 1.375rem;
    font-weight: var(--font-weight-bold);
    color: var(--brand-secondary);
    text-align: center;
    margin-bottom: var(--spacing-lg);
    position: relative;
    padding-bottom: 12px;
}

.prizes-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: var(--brand-primary);
    border-radius: 2px;
    box-shadow: 0 2px 4px rgba(85, 186, 189, 0.3);
}

.prizes-grid {
    display: flex;
    gap: var(--spacing-lg);
    justify-content: center;
    align-items: flex-end;
    flex-wrap: wrap;
    padding: var(--spacing-md) 0;
}

.prize-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    transition: transform var(--transition-slow), filter var(--transition);
    cursor: default;
}

.prize-item:hover {
    transform: translateY(-6px) scale(1.03);
    filter: drop-shadow(0 8px 16px rgba(85, 186, 189, 0.2));
}

.prize-main {
    flex: 0 1 400px;
}

.prize-main .prize-img {
    width: 270px;
    height: 270px;
    border-radius: 50%;
    overflow: hidden;
    border: 4px solid var(--brand-primary);
    box-shadow: var(--shadow-lg);
    margin-bottom: var(--spacing-sm);
    background: linear-gradient(135deg, #f0feff 0%, #e0f5f6 100%);
    transition: transform var(--transition-slow), box-shadow var(--transition);
    transform: translateZ(0);
    position: relative;
}

.prize-main .prize-img::before {
    content: '';
    position: absolute;
    inset: -4px;
    border-radius: 50%;
    padding: 4px;
    background: linear-gradient(135deg, var(--brand-primary), var(--brand-primary-light));
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    opacity: 0;
    transition: opacity var(--transition);
}

.prize-item:hover .prize-main .prize-img::before {
    opacity: 1;
}

.prize-sub {
    flex: 0 1 250px;
}

.prize-sub .prize-img {
    width: 180px;
    height: 180px;
    border-radius: 50%;
    overflow: hidden;
    border: 3px solid var(--brand-secondary);
    box-shadow: var(--shadow-md);
    margin-bottom: var(--spacing-sm);
    background: linear-gradient(135deg, #e8f4f6 0%, #d8eef2 100%);
    transition: transform var(--transition-slow), box-shadow var(--transition);
    transform: translateZ(0);
}

.prize-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.prize-item:hover .prize-img img {
    transform: scale(1.1) rotate(2deg);
}

.prize-info {
    padding: var(--spacing-xs);
    transform: translateZ(0);
}

.prize-name {
    font-size: 1.25rem;
    font-weight: var(--font-weight-bold);
    color: var(--color-black);
    margin-bottom: 6px;
    transition: color var(--transition);
}

.prize-item:hover .prize-name {
    color: var(--brand-primary);
}

.prize-sub .prize-name {
    font-size: 1.125rem;
}

.prize-count {
    font-size: 1.0625rem;
    color: var(--brand-primary);
    font-weight: var(--font-weight-semibold);
    background: rgba(85, 186, 189, 0.1);
    padding: 4px 12px;
    border-radius: 20px;
    display: inline-block;
}

/* ==================== Coming Soon ==================== */
.coming-soon {
    text-align: center;
    padding: var(--spacing-xl) var(--spacing-lg);
    background: linear-gradient(135deg, rgba(245, 245, 245, 0.8) 0%, rgba(240, 240, 240, 0.6) 100%);
    border-radius: var(--border-radius);
    border: 2px dashed var(--color-border);
    position: relative;
    overflow: hidden;
}

.coming-soon::before {
    content: '';
    position: absolute;
    top: -2px;
    left: -2px;
    right: -2px;
    bottom: -2px;
    background: linear-gradient(45deg, transparent 30%, rgba(85, 186, 189, 0.1) 50%, transparent 70%);
    background-size: 200% 200%;
    animation: shimmer 3s ease-in-out infinite;
    pointer-events: none;
}

@keyframes shimmer {
    0%, 100% { background-position: 0% 0%; }
    50% { background-position: 100% 100%; }
}

.coming-soon p {
    font-size: 1.25rem;
    color: var(--color-gray);
    font-weight: var(--font-weight-semibold);
    position: relative;
    z-index: 1;
}

/* ==================== Announcement Container ==================== */
.announcement-container {
    margin-top: var(--spacing-lg);
    padding: 0 var(--spacing-md) var(--spacing-lg);
}

.announcement-title {
    font-size: 1.375rem;
    font-weight: var(--font-weight-bold);
    color: var(--brand-secondary);
    text-align: center;
    margin-bottom: var(--spacing-md);
}

.announcement-placeholder {
    text-align: center;
    padding: var(--spacing-lg);
    background: linear-gradient(135deg, rgba(255, 249, 230, 0.9) 0%, rgba(255, 243, 205, 0.8) 100%);
    border-radius: var(--border-radius);
    border: 2px solid #ffd700;
    box-shadow: var(--shadow-sm), inset 0 1px 0 rgba(255, 255, 255, 0.5);
    transition: var(--transition);
}

.announcement-placeholder:hover {
    box-shadow: var(--shadow-md), inset 0 1px 0 rgba(255, 255, 255, 0.5);
}

.announcement-placeholder p {
    font-size: 1.125rem;
    color: #d97706;
    font-weight: var(--font-weight-semibold);
    margin: 0;
}

/* ==================== Winner List ==================== */
.winner-list {
    margin-top: var(--spacing-xl);
    padding: var(--spacing-xl);
    padding-top: var(--spacing-xl);
    border-top: 3px solid var(--brand-primary);
}

.winner-title {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--brand-secondary);
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.winner-main {
    display: flex;
    gap: var(--spacing-lg);
    align-items: center;
    background-color: #fff9e6;
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    margin-bottom: var(--spacing-lg);
    border: 3px solid #ffd700;
}

.winner-main .winner-prize-img {
    flex: 0 0 200px;
}

.winner-main .winner-prize-img img {
    width: 200px;
    height: 200px;
    object-fit: cover;
    border-radius: var(--border-radius);
    box-shadow: 0 4px 15px var(--color-shadow);
}

.winner-main .winner-details {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.winner-name {
    display: flex;
    align-items: baseline;
    gap: var(--spacing-xs);
}

.winner-label {
    font-size: 1rem;
    color: var(--color-gray);
    font-weight: 500;
}

.winner-value {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--brand-secondary);
}

.winner-review {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.review-label {
    font-size: 0.875rem;
    color: var(--color-gray);
    font-weight: 500;
}

.review-placeholder {
    border-radius: var(--border-radius-sm);
    overflow: hidden;
    box-shadow: 0 2px 10px var(--color-shadow);
}

.review-placeholder img {
    width: 100%;
    height: auto;
}

/* Winner Sub Grid */
.winner-sub-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.winner-sub {
    display: flex;
    gap: var(--spacing-md);
    align-items: flex-start;
    background-color: var(--color-light-gray);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    border: 2px solid var(--color-border);
}

.winner-sub .winner-prize-img {
    flex: 0 0 120px;
}

.winner-sub .winner-prize-img img {
    width: 120px;
    height: 120px;
    object-fit: cover;
    border-radius: var(--border-radius-sm);
    box-shadow: 0 2px 10px var(--color-shadow);
}

.winner-sub .winner-details {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.winner-sub .winner-value {
    font-size: 1.25rem;
}

/* ==================== Footer ==================== */
.footer {
    background-color: transparent;
    color: var(--color-black);
    padding: var(--spacing-lg) 0 var(--spacing-md);
    margin-top: auto;
}

.footer-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
    text-align: center;
}

.footer-copyright {
    font-size: 0.875rem;
    color: var(--color-gray-light);
    line-height: 1.6;
    opacity: 0.8;
}

/* ==================== Fixed Buttons ==================== */
.rules-btn {
    position: fixed;
    bottom: 72px;
    right: var(--spacing-md);
    background: var(--brand-primary);
    color: var(--color-white);
    padding: 20px 13px;
    border-radius: 26px;
    font-size: 0.9375rem;
    font-weight: var(--font-weight-semibold);
    box-shadow: var(--shadow-brand);
    transition: transform var(--transition), box-shadow var(--transition), background-color var(--transition);
    z-index: var(--z-fixed-btn);
    cursor: pointer;
    writing-mode: vertical-rl;
    text-orientation: upright;
    letter-spacing: 0.25em;
    will-change: transform;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
}

.rules-btn::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: 26px;
    background: linear-gradient(135deg, rgba(255,255,255,0.2) 0%, transparent 100%);
    pointer-events: none;
}

.rules-btn:hover {
    transform: translateY(-3px) scale(1.02);
    box-shadow: 0 8px 24px rgba(85, 186, 189, 0.4), 0 4px 12px rgba(0, 0, 0, 0.12);
    background: var(--brand-primary-dark);
}

.rules-btn:active {
    transform: translateY(-1px) scale(0.98);
    box-shadow: var(--shadow-md);
}

.scroll-top-btn {
    position: fixed;
    bottom: var(--spacing-md);
    right: var(--spacing-md);
    width: 48px;
    height: 48px;
    background-color: rgba(255, 255, 255, 0.96);
    border-radius: 50%;
    box-shadow: var(--shadow-md);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition), visibility var(--transition), transform var(--transition), box-shadow var(--transition);
    z-index: var(--z-fixed-btn);
    cursor: pointer;
    border: 2px solid var(--brand-primary);
    will-change: transform, opacity;
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    user-select: none;
    -webkit-tap-highlight-color: transparent;
}

.scroll-top-btn.show {
    opacity: 1;
    visibility: visible;
    animation: bounceIn 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

@keyframes bounceIn {
    0% {
        transform: scale(0);
        opacity: 0;
    }
    50% {
        transform: scale(1.1);
    }
    100% {
        transform: scale(1);
        opacity: 1;
    }
}

.scroll-top-btn:hover {
    transform: translateY(-3px) scale(1.08);
    box-shadow: 0 8px 24px rgba(85, 186, 189, 0.35), 0 4px 12px rgba(0, 0, 0, 0.1);
    background-color: rgba(255, 255, 255, 1);
    border-color: var(--brand-primary-dark);
}

.scroll-top-btn:active {
    transform: translateY(-1px) scale(1.02);
    box-shadow: var(--shadow-sm);
}

.scroll-top-btn img {
    width: 46px;
    height: 46px;
    transition: transform var(--transition);
}

.scroll-top-btn:hover img {
    transform: translateY(-2px);
}

/* ==================== Modal ==================== */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--color-overlay);
    z-index: var(--z-modal);
    overflow-y: auto;
    padding: var(--spacing-md);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
}

.modal.show {
    display: flex;
    align-items: flex-start;
    justify-content: center;
    padding-top: var(--spacing-lg);
    padding-bottom: var(--spacing-lg);
}

.modal-content {
    background-color: var(--color-white);
    border-radius: var(--border-radius-lg);
    max-width: 800px;
    width: 100%;
    position: relative;
    box-shadow: 0 8px 40px rgba(0, 0, 0, 0.25), 0 4px 12px rgba(0, 0, 0, 0.15);
    margin: auto;
    display: flex;
    flex-direction: column;
    max-height: 85vh;
    overflow: hidden;
    will-change: transform;
    transform: translateZ(0);
}

.modal-close {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    font-size: 1.75rem;
    color: var(--color-gray);
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: var(--transition);
    background-color: var(--color-light-gray);
    z-index: 10;
    line-height: 1;
}

.modal-close:hover {
    background-color: var(--brand-primary);
    color: var(--color-white);
    transform: rotate(90deg);
}

.modal-header {
    padding: var(--spacing-lg) var(--spacing-lg) var(--spacing-md);
    border-bottom: 2px solid var(--color-border);
    background-color: var(--color-white);
    border-radius: var(--border-radius-lg) var(--border-radius-lg) 0 0;
    flex-shrink: 0;
}

.modal-body {
    padding: var(--spacing-lg);
    overflow-y: auto;
    flex: 1;
    /* 自定義滾動條樣式 */
    scrollbar-width: thin;
    scrollbar-color: var(--brand-primary) var(--color-light-gray);
    -webkit-overflow-scrolling: touch;
}

/* Webkit 瀏覽器滾動條樣式 */
.modal-body::-webkit-scrollbar {
    width: 10px;
}

.modal-body::-webkit-scrollbar-track {
    background: var(--color-light-gray);
    border-radius: 0 var(--border-radius-lg) var(--border-radius-lg) 0;
}

.modal-body::-webkit-scrollbar-thumb {
    background: var(--brand-primary);
    border-radius: 5px;
}

.modal-body::-webkit-scrollbar-thumb:hover {
    background: var(--brand-secondary);
}

.modal-header h2 {
    font-size: 1.625rem;
    color: var(--brand-secondary);
    margin-bottom: var(--spacing-sm);
    text-align: center;
    line-height: 1.4;
    padding-right: 40px;
}

.modal-subtitle {
    font-size: 1.125rem;
    color: var(--brand-primary);
    text-align: center;
    margin-bottom: var(--spacing-md);
    font-weight: 600;
}

.modal-section {
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--color-border);
}

.modal-section:last-child {
    border-bottom: none;
}

.modal-section h3 {
    font-size: 1.25rem;
    color: var(--brand-secondary);
    margin-bottom: 10px;
}

.modal-section p {
    line-height: 1.8;
    color: var(--color-gray);
    margin-bottom: var(--spacing-sm);
}

.modal-section .highlight {
    color: var(--brand-primary);
    font-weight: 600;
}

.modal-section ol {
    margin-left: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
}

.modal-section ol li {
    margin-bottom: var(--spacing-sm);
    line-height: 1.8;
    color: var(--color-gray);
}

.modal-section ul {
    margin-left: var(--spacing-md);
}

.modal-section ul li {
    margin-bottom: var(--spacing-xs);
    line-height: 1.8;
    color: var(--color-gray);
}

.modal-section a {
    color: var(--brand-primary);
    text-decoration: underline;
}

.modal-section a:hover {
    color: var(--brand-secondary);
}

.modal-link {
    background-color: var(--color-light-gray);
    padding: var(--spacing-md);
    border-radius: var(--border-radius-sm);
    border-left: 4px solid var(--brand-primary);
}

.modal-footer-note {
    font-size: 0.9rem;
    color: var(--color-gray);
    font-style: italic;
    text-align: center;
    margin-top: var(--spacing-md);
}

/* ==================== Responsive Design ==================== */

/* Tablet (≤769px) */
@media screen and (max-width: 769px) {
    :root {
        --spacing-xl: 28px;
        --spacing-xxl: 40px;
    }
    
    .main-content {
        background-image: url('../../src/img/bg/bg-pad.png');
        padding: var(--spacing-lg) 0;
    }
    
    .nav-logo img {
        height: 40px;
    }
    
    .social-btn img {
        height: 36px;
    }
    
    .section-title img {
        max-width: 400px;
    }
    
    .intro-text {
        font-size: 1rem;
    }
    
    .intro-text br {
        display: none;
    }
    
    .cta-btn {
        font-size: 1rem;
        min-width: 180px;
    }
    
    .prize-main .prize-img {
        width: 240px;
        height: 240px;
    }
    
    .prize-sub .prize-img {
        width: 170px;
        height: 170px;
    }
    
    .prize-name {
        font-size: 1.125rem;
    }
    
    .winner-main {
        flex-direction: column;
        text-align: center;
    }
    
    .winner-main .winner-prize-img {
        flex: 0 0 auto;
    }
    
    .winner-main .winner-prize-img img {
        width: 180px;
        height: 180px;
        margin: 0 auto;
    }
    
    .winner-name {
        justify-content: center;
    }
    
    .winner-sub-grid {
        grid-template-columns: 1fr;
    }
    
    .modal-body {
        padding: var(--spacing-lg);
    }
    
    .modal-body h2 {
        font-size: 1.5rem;
    }
}

/* Mobile (≤577px) */
@media screen and (max-width: 577px) {
    :root {
        --spacing-sm: 10px;
        --spacing-md: 14px;
        --spacing-lg: 20px;
        --spacing-xl: 24px;
        --spacing-xxl: 28px;
    }
    
    html {
        font-size: 14px;
    }
    
    .main-content {
        background-image: url('../../src/img/bg/bg-mobile.png');
        padding: var(--spacing-md) 0;
    }
    
    .navbar {
        padding: var(--spacing-xs) 0;
    }
    
    .nav-container {
        padding: 0 var(--spacing-sm);
    }
    
    .nav-logo img {
        height: 35px;
    }
    
    .nav-social {
        gap: var(--spacing-xs);
    }
    
    .social-btn img {
        height: 30px;
    }
    
    .section {
        padding: 0 var(--spacing-sm);
        margin-bottom: var(--spacing-lg);
    }
    
    .section-title img {
        max-width: 280px;
    }
    
    .activity-intro,
    .season-section {
        padding: 2px;
        margin-left: var(--spacing-lg);
        margin-right: var(--spacing-lg);
        background: rgba(85, 186, 189, 0.15);
        box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
        border: 1px solid rgba(85, 186, 189, 0.2);
        border-radius: var(--border-radius-lg);
    }
    
    .activity-intro::before,
    .season-section::before {
        background: rgba(255, 255, 255, 0.92);
        backdrop-filter: blur(8px);
        -webkit-backdrop-filter: blur(8px);
    }
    
    .activity-intro::after,
    .season-section::after {
        opacity: 0.5;
    }
    
    .intro-text {
        font-size: 0.9375rem;
        line-height: 1.85;
        letter-spacing: 0.2px;
    }
    
    .cta-buttons {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .cta-btn {
        width: 100%;
        min-width: auto;
        padding: var(--spacing-sm);
    }
    
    .season-period {
        font-size: 1rem;
        padding: var(--spacing-xs) var(--spacing-md);
    }
    
    .prizes-title,
    .announcement-title {
        font-size: 1.25rem;
    }
    
    .prizes-grid {
        flex-direction: column;
        align-items: center;
        gap: var(--spacing-md);
    }
    
    .prize-main {
        order: 1;
    }
    
    .prize-sub:first-child {
        order: 2;
    }
    
    .prize-sub:last-child {
        order: 3;
    }
    
    .prize-main,
    .prize-sub {
        flex: 0 1 auto;
    }
    
    .prize-main .prize-img,
    .prize-sub .prize-img {
        width: 200px;
        height: 200px;
        border-radius: 50%;
        overflow: hidden;
        border: 4px solid var(--brand-primary);
        box-shadow: 0 4px 16px rgba(85, 186, 189, 0.25), 0 2px 6px rgba(0, 0, 0, 0.08);
        margin-bottom: var(--spacing-xs);
        background: #f0feff;
    }
    
    .prize-main .prize-name,
    .prize-sub .prize-name {
        font-size: 1.0625rem;
    }
    
    .coming-soon {
        padding: var(--spacing-md);
    }
    
    .coming-soon p {
        font-size: 1.125rem;
    }
    
    .winner-main {
        padding: var(--spacing-md);
    }
    
    .winner-main .winner-prize-img img {
        width: 150px;
        height: 150px;
    }
    
    .winner-value {
        font-size: 1.5rem;
    }
    
    .winner-sub {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }
    
    .winner-sub .winner-prize-img {
        flex: 0 0 auto;
    }
    
    .winner-sub .winner-prize-img img {
        width: 100px;
        height: 100px;
    }
    
    .winner-sub .winner-value {
        font-size: 1.125rem;
    }
    
    .rules-btn {
        bottom: 18px;
        left: 50%;
        right: auto;
        transform: translateX(-50%);
        padding: 10px 22px;
        font-size: 0.875rem;
        writing-mode: horizontal-tb;
        text-orientation: mixed;
        letter-spacing: 0.08em;
        border-radius: 24px;
        box-shadow: 0 3px 12px rgba(85, 186, 189, 0.25), 0 1px 4px rgba(0, 0, 0, 0.08);
    }
    
    .scroll-top-btn {
        bottom: var(--spacing-sm);
        right: var(--spacing-sm);
        width: 45px;
        height: 45px;
    }
    
    .scroll-top-btn img {
        width: 43px;
        height: 43px;
    }
    
    .modal {
        padding: var(--spacing-sm);
    }
    
    .modal.show {
        padding-top: var(--spacing-md);
        padding-bottom: var(--spacing-md);
    }
    
    .modal-body {
        padding: var(--spacing-md);
        max-height: 75vh;
    }
    
    .modal-close {
        top: var(--spacing-sm);
        right: var(--spacing-sm);
        width: 35px;
        height: 35px;
        font-size: 1.5rem;
    }
    
    .modal-header {
        padding: var(--spacing-lg);
        padding-bottom: var(--spacing-sm);
    }
    
    .modal-header h2 {
        font-size: 1.25rem;
        padding-right: var(--spacing-lg);
    }
    
    .modal-subtitle {
        font-size: 1rem;
    }
    
    .modal-section h3 {
        font-size: 1.125rem;
    }
    
    .modal-section p,
    .modal-section ol li,
    .modal-section ul li {
        font-size: 0.95rem;
    }
    
    .footer-copyright {
        font-size: 0.75rem;
    }
}

/* ==================== Animations ==================== */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(15px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.section {
    animation: fadeIn 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    will-change: opacity, transform;
}

.prize-item {
    animation: slideUp 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    animation-fill-mode: both;
}

.prize-item:nth-child(1) {
    animation-delay: 0.1s;
}

.prize-item:nth-child(2) {
    animation-delay: 0s;
}

.prize-item:nth-child(3) {
    animation-delay: 0.1s;
}

/* ==================== Print Styles ==================== */
@media print {
    .navbar,
    .rules-btn,
    .scroll-top-btn,
    .modal {
        display: none !important;
    }
    
    .main-content {
        background: none;
    }
    
    .section {
        page-break-inside: avoid;
    }
}

/* ==================== Accessibility ==================== */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
    
    html {
        scroll-behavior: auto;
    }
    
    .section {
        animation: none;
    }
}

/* Focus styles for keyboard navigation */
a:focus-visible,
button:focus-visible {
    outline: 3px solid var(--brand-primary);
    outline-offset: 3px;
    border-radius: 4px;
}

a:focus:not(:focus-visible),
button:focus:not(:focus-visible) {
    outline: none;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --color-shadow: rgba(0, 0, 0, 0.4);
    }
    
    .cta-btn,
    .rules-btn {
        border: 2px solid currentColor;
    }
    
    .activity-intro,
    .season-section {
        border: 3px solid var(--brand-primary);
    }
}

/* Performance optimizations */
@media (hover: hover) {
    .prize-item:hover {
        transform: translateY(-4px) scale(1.02);
    }
    
    .cta-btn:hover,
    .social-btn:hover,
    .nav-logo:hover {
        /* Hover effects only on devices that support hover */
    }
}

/* Reduce animations on low-end devices */
@media (prefers-reduced-data: reduce) {
    * {
        background-image: none !important;
    }
    
    .main-content {
        background-image: none;
        background-color: #f8f9fa;
    }
}