/* ==========================================
   設計系統變數 - 日系風格配色
   ========================================== */
:root {
    /* 主要顏色 */
    --color-primary: #2c2c2c;
    --color-primary-light: #757575;
    --color-secondary: #f5f5f5;
    --color-background: #ffffff;
    --color-background-alt: #f5f5f5;
    --color-border: #d9d9d9;
    --color-text: #1e1e1e;
    --color-text-secondary: #757575;
    --color-text-inverse: #f5f5f5;

    /* 日系配色強調 */
    --color-accent-sakura: #ffc0cb;
    --color-accent-blue: #89CFF0;
    --color-accent-green: #90EE90;

    /* 字體 */
    --font-family-primary: 'Inter', 'Noto Sans TC', sans-serif;
    --font-size-base: 16px;
    --font-size-small: 14px;
    --font-size-medium: 20px;
    --font-size-large: 24px;
    --font-size-xlarge: 32px;
    --font-size-hero: 72px;

    /* 間距 */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 12px;
    --space-lg: 16px;
    --space-xl: 24px;
    --space-2xl: 32px;
    --space-3xl: 48px;
    --space-4xl: 64px;
    --space-5xl: 160px;

    /* 圓角 */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-full: 9999px;

    /* 陰影 - 柔和的日系陰影 */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
    --shadow-hover: 0 12px 32px rgba(0, 0, 0, 0.15);

    /* 過渡效果 */
    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* ==========================================
   全局重置與基礎樣式
   ========================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family-primary);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-background);
    overflow-x: hidden;
}

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

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

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

/* ==========================================
   Header 樣式
   ========================================== */
.header {
    background-color: var(--color-background);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
    background-color: rgba(255, 255, 255, 0.95);
}

.header-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--space-2xl);
    display: flex;
    align-items: center;
    gap: var(--space-xl);
}

.header-logo {
    display: flex;
    align-items: center;
}

.logo-icon {
    width: 40px;
    height: 35px;
    transition: transform var(--transition-base);
}

.logo-icon:hover {
    transform: scale(1.05) rotate(2deg);
}

.nav-desktop {
    flex: 1;
    display: flex;
    justify-content: flex-end;
    gap: var(--space-sm);
    flex-wrap: wrap;
}

.nav-link {
    padding: var(--space-sm);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    font-size: var(--font-size-base);
    white-space: nowrap;
}

.nav-link:hover {
    background-color: var(--color-secondary);
}

.nav-link.active {
    background-color: var(--color-secondary);
    font-weight: 500;
}

.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    padding: var(--space-sm);
    z-index: 1001;
}

.hamburger span {
    width: 24px;
    height: 2px;
    background-color: var(--color-text);
    transition: all var(--transition-base);
    border-radius: 2px;
}

.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(7px, 7px);
}

.hamburger.active span:nth-child(2) {
    opacity: 0;
}

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -7px);
}

.header-auth {
    display: flex;
    gap: var(--space-md);
}

.nav-mobile {
    display: none;
    flex-direction: column;
    gap: var(--space-sm);
    padding: var(--space-lg);
    background-color: var(--color-background);
    border-top: 1px solid var(--color-border);
}

.nav-mobile.active {
    display: flex;
}

/* ==========================================
   按鈕樣式
   ========================================== */
.btn {
    padding: var(--space-sm) var(--space-lg);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-base);
    font-weight: 400;
    transition: all var(--transition-base);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

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

.btn:hover::before {
    width: 300px;
    height: 300px;
}

.btn-primary {
    background-color: var(--color-primary);
    color: var(--color-text-inverse);
    border: 1px solid var(--color-primary);
}

.btn-primary:hover {
    background-color: #1a1a1a;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-large {
    padding: var(--space-md) var(--space-xl);
    font-size: 18px;
}

/* ==========================================
   Hero Section
   ========================================== */
.hero {
    background-color: var(--color-secondary);
    padding: var(--space-5xl) var(--space-xl);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 1;
}

/* 調整你原本的 .hero-bg-image */
.hero-bg-image {
  background-image: url("hero.jpg");
  background-size: cover;    /* 稍微放大，避免位移時看到邊緣 */
  background-position: 50% 50%;
  filter: saturate(1) brightness(0.95); /* 依你的需求保留或調整 */
  animation: hero-pan 15s linear infinite alternate;
  will-change: background-position;
}

/* 水平來回平移（可改成 90s/120s 更慢）*/
@keyframes hero-pan {
  from { background-position: 0% 0%; }
  to   { background-position: 100% 100%; }
}



.hero-bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background: rgba(255, 255, 255, 0.35); /* ← 白色透明層，0.3為透明度 */
  z-index: 2;
}


.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,192,203,0.1) 0%, transparent 70%);
    animation: float 20s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) rotate(0deg); }
    33% { transform: translate(30px, -30px) rotate(120deg); }
    66% { transform: translate(-20px, 20px) rotate(240deg); }
}

.hero-content {
    position: relative;
    z-index: 1;
}

.hero-title,
.hero-subtitle {
    color: #fff; /* 文字變白 */
    text-shadow:
        2px 2px 4px rgba(0, 0, 0, 0.8),
        -2px -2px 4px rgba(0, 0, 0, 0.8),
        2px -2px 4px rgba(0, 0, 0, 0.8),
        -2px 2px 4px rgba(0, 0, 0, 0.8); /* 黑邊效果 */
}

/* 讓主標題保持漸層風格時的替代方案 */
.hero-title {
    -webkit-text-fill-color: #fff; /* 改為白色填滿 */
    -webkit-text-stroke: 0.1px #000; /* 黑色描邊 */
    text-stroke: 0.1px #000; /* Firefox未支援，但不影響其他瀏覽器 */
}


/* ==========================================
   Flipbook Section (StPageFlip)
   ========================================== */
.flipbook-section {
    padding: var(--space-4xl) var(--space-xl);
    background-color: var(--color-background);
}

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

.flipbook-wrapper {
    display: flex;
    justify-content: center;
    align-items: center;
    margin: var(--space-3xl) 0;
    min-height: 500px;
    perspective: 2000px;
}

.flipbook {
    margin: 0 auto;
    box-shadow: var(--shadow-lg);
    border-radius: var(--radius-sm);
}

/* 頁面樣式 */
.page {
    background-color: var(--color-background);
    color: var(--color-text);
    border: 1px solid var(--color-border);
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}

.page img {
    user-select: none;
    pointer-events: none;
}

/* 控制按鈕 */
.flipbook-controls {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--space-xl);
    margin-top: var(--space-3xl);
}

.page-counter {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    min-width: 80px;
    text-align: center;
    font-weight: 500;
}

/* 翻書動畫效果 */
.stf__parent {
    perspective: 2000px;
}

.stf__wrapper {
    position: relative;
    width: 100%;
    height: 100%;
}

.stf__block {
    position: absolute;
    transform-style: preserve-3d;
}

.stf__item {
    position: absolute;
    transform-style: preserve-3d;
}

/* 響應式調整 */
@media (max-width: 768px) {
    .flipbook-wrapper {
        min-height: 400px;
    }

    .flipbook-controls {
        flex-direction: column;
        gap: var(--space-md);
    }

    .flipbook-controls .btn {
        width: 100%;
        max-width: 200px;
    }
}

@media (max-width: 480px) {
    .flipbook-section {
        padding: var(--space-2xl) var(--space-lg);
    }

    .flipbook-wrapper {
        min-height: 300px;
        margin: var(--space-xl) 0;
    }
}

/* ==========================================
   Avatar Section
   ========================================== */
.avatar-section {
    display: flex;
    justify-content: center;
    padding: var(--space-2xl) var(--space-xl);
}

.avatar-group {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.avatar {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    overflow: hidden;
    border: 2px solid var(--color-background);
    transition: transform var(--transition-base);
}

.avatar:hover {
    transform: scale(1.15) translateY(-4px);
    z-index: 10;
}

.avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.avatar-overflow {
    background-color: var(--color-secondary);
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-small);
    color: var(--color-text-secondary);
}

/* ==========================================
   Content Panels
   ========================================== */
.content-panels {
    max-width: 1200px;
    margin: 0 auto;
}

.panel {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-3xl);
    padding: var(--space-4xl);
    align-items: center;
    opacity: 0.95;
}

.panel-left {
    /* 保持原有順序 */
}

.panel-right {
    /* 交換順序 */
}

.panel-right .panel-content {
    order: 1;
}

.panel-right .panel-image {
    order: 2;
}

.panel-image {
    position: relative;
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-slow);
}

.panel-image:hover {
    transform: scale(1.02);
    box-shadow: var(--shadow-lg);
}

.panel-image img {
    width: 100%;
    height: 350px;
    object-fit: cover;
}

.panel-image-placeholder {
    width: 100%;
    height: 350px;
    background-color: #e3e3e3;
    display: flex;
    align-items: center;
    justify-content: center;
}

.panel-content {
    display: flex;
    flex-direction: column;
    gap: var(--space-xl);
}

.panel-heading {
    font-size: var(--font-size-large);
    font-weight: 600;
    line-height: 1.2;
    color: var(--color-text);
}

.panel-subheading {
    font-size: var(--font-size-medium);
    color: var(--color-text-secondary);
    line-height: 1.2;
}

.panel-text {
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-text);
}

/* ==========================================
   Game Gallery
   ========================================== */
.game-gallery {
    padding: var(--space-4xl) var(--space-xl);
    background-color: var(--color-background);
}

.gallery-grid {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--space-xl);
}

.game-card {
    background-color: var(--color-background);
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
    cursor: pointer;
    position: relative;
}

.game-card:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: var(--shadow-hover);
}

.game-card-image {
    position: relative;
    width: 100%;
    height: 250px;
    overflow: hidden;
}

.game-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.game-card:hover .game-card-image img {
    transform: scale(1.1);
}

.game-card-info {
    padding: var(--space-lg);
    position: relative;
    z-index: 1;
}

.game-card-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: var(--space-sm);
}

.game-card-genre {
    background-color: var(--color-secondary);
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 12px;
    display: inline-block;
    margin-bottom: var(--space-sm);
}

.game-card-description {
    font-size: var(--font-size-small);
    line-height: 1.5;
    color: var(--color-text-secondary);
    margin-top: var(--space-sm);
}

/* ==========================================
   FAQ Section
   ========================================== */
.faq-section {
    padding: var(--space-4xl) var(--space-xl);
    background-color: var(--color-background);
}

.faq-container {
    max-width: 640px;
    margin: 0 auto;
}

.section-heading {
    font-size: var(--font-size-large);
    font-weight: 600;
    text-align: center;
    margin-bottom: var(--space-sm);
}

.section-subheading {
    font-size: var(--font-size-medium);
    color: var(--color-text-secondary);
    text-align: center;
    margin-bottom: var(--space-3xl);
}

.accordion {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

.accordion-item {
    background-color: var(--color-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    padding: var(--space-lg);
    transition: all var(--transition-base);
    cursor: pointer;
}

.accordion-item:hover {
    box-shadow: var(--shadow-sm);
}

.accordion-item.active {
    background-color: var(--color-background);
}

.accordion-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--space-sm);
}

.accordion-title {
    font-size: var(--font-size-base);
    font-weight: 600;
    flex: 1;
}

.accordion-icon {
    width: 20px;
    height: 20px;
    transition: transform var(--transition-base);
    flex-shrink: 0;
}

.accordion-item.active .accordion-icon {
    transform: rotate(180deg);
}

.accordion-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-slow);
    margin-top: 0;
}

.accordion-item.active .accordion-content {
    max-height: 500px;
    margin-top: var(--space-sm);
}

.accordion-text {
    color: var(--color-text);
    line-height: 1.6;
}

/* ==========================================
   Footer
   ========================================== */
.footer {
    background-color: var(--color-background);
    border-top: 1px solid var(--color-border);
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--space-2xl) var(--space-2xl) var(--space-5xl);
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: var(--space-lg);
}

.footer-brand {
    display: flex;
    flex-direction: column;
    gap: var(--space-xl);
}

.footer-logo {
    width: 24px;
    height: 35px;
}

.social-links {
    display: flex;
    gap: var(--space-lg);
}

.social-link {
    width: 24px;
    height: 24px;
    color: var(--color-text);
    transition: all var(--transition-base);
}

.social-link:hover {
    color: var(--color-primary-light);
    transform: translateY(-2px);
}

.footer-column {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.footer-column-title {
    font-size: var(--font-size-base);
    font-weight: 600;
    margin-bottom: var(--space-sm);
}

.footer-link {
    font-size: var(--font-size-base);
    color: var(--color-text);
    transition: color var(--transition-fast);
}

.footer-link:hover {
    color: var(--color-primary-light);
}

/* ==========================================
   響應式設計 - 平板
   ========================================== */
@media (max-width: 768px) {
    :root {
        --font-size-hero: 88px;
        --font-size-xlarge: 24px;
        --space-5xl: 80px;
    }

    .nav-desktop {
        display: none;
    }

    .hamburger {
        display: flex;
    }

    .header-auth {
        margin-left: auto;
    }

    .panel {
        grid-template-columns: 1fr;
        gap: var(--space-xl);
        padding: var(--space-xl);
    }

    .panel-right .panel-content {
        order: 1;
    }

    .panel-right .panel-image {
        order: 2;
    }

    .gallery-grid {
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
        gap: var(--space-lg);
    }

    .footer-container {
        grid-template-columns: 1fr;
        padding-bottom: var(--space-4xl);
    }
}

/* ==========================================
   響應式設計 - 手機
   ========================================== */
@media (max-width: 480px) {
    :root {
        --font-size-hero: 50px;
        --font-size-xlarge: 20px;
        --font-size-large: 20px;
        --space-5xl: 60px;
    }

    .header-container {
        padding: var(--space-lg);
    }

    .hero {
        padding: var(--space-4xl) var(--space-lg);
    }

    .hero-title {
        font-size: 32px;
    }

    .panel {
        padding: var(--space-lg);
    }

    .panel-image img,
    .panel-image-placeholder {
        height: 250px;
    }

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

    .game-card-image {
        height: 200px;
    }

    .faq-section {
        padding: var(--space-2xl) var(--space-lg);
    }
}

/* ==========================================
   動畫效果
   ========================================== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in-up {
    animation: fadeInUp 0.6s ease-out;
}

/* Smooth scrolling for internal links */
html {
    scroll-behavior: smooth;
}

/* Loading animation */
@keyframes shimmer {
    0% {
        background-position: -1000px 0;
    }
    100% {
        background-position: 1000px 0;
    }
}

.loading {
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 1000px 100%;
    animation: shimmer 2s infinite;
}