/* ========================================
   StoryWeb - Adventure Theme System
   ======================================== */

:root {
    /* 主色調 - 深色冒險風格 */
    --color-bg: #0F0F0F;
    --color-bg-secondary: #1A1A1A;
    --color-bg-tertiary: #181818;
    --color-surface: rgba(24, 24, 24, 0.9);
    --color-surface-hover: rgba(40, 40, 40, 0.9);

    /* 金色主題 */
    --color-primary: #C9A962;
    --color-primary-dim: rgba(201, 169, 98, 0.4);
    --color-primary-glow: rgba(201, 169, 98, 0.5);
    --color-secondary: #8B7355;
    --color-accent: #D4A853;

    /* 文字色 */
    --color-text: #FAF8F5;
    --color-text-secondary: #888888;
    --color-text-muted: #666666;

    /* 邊框 */
    --color-border: #2A2A2A;
    --color-border-hover: #3A3A3A;

    /* 狀態色 */
    --color-success: #4ADE80;
    --color-warning: #fbbf24;
    --color-error: #F87171;

    /* 陰影與發光 */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.6);
    --shadow-glow: 0 0 20px var(--color-primary-glow);

    /* 圓角 - 對應 Pencil 設計 */
    --radius-sm: 0.5rem;   /* 8px */
    --radius-md: 0.75rem;  /* 12px */
    --radius-lg: 1rem;     /* 16px */
    --radius-xl: 1.5rem;
    --radius-2xl: 2rem;

    /* 字體 */
    --font-sans: 'Noto Sans TC', -apple-system, BlinkMacSystemFont, sans-serif;

    /* 過渡 */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;

    /* 背景圖 */
    --bg-image-mobile: url('https://images.unsplash.com/photo-1733568232322-aa4d9814935a?w=800&q=80');
    --bg-image-desktop: url('https://images.unsplash.com/photo-1763318188499-4cb333dc3bd3?w=1920&q=80');
}

/* ========================================
   基礎重置
   ======================================== */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    background-color: var(--color-bg);
    color: var(--color-text);
    min-height: 100vh;
    line-height: 1.6;
    overflow-x: hidden;
}

/* 選取文字樣式 */
::selection {
    background-color: var(--color-primary);
    color: var(--color-bg);
}

/* ========================================
   背景效果 - 冒險風格
   ======================================== */

body {
    background-image: var(--bg-image-desktop);
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    background-repeat: no-repeat;
}

@media (max-width: 768px) {
    body {
        background-image: var(--bg-image-mobile);
    }
}

/* 深色暈影覆蓋層 */
.background-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.85);
    z-index: -1;
    pointer-events: none;
}

/* ========================================
   玻璃擬態效果
   ======================================== */

.glass {
    background: var(--color-surface);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--color-border);
}

.glass-strong {
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(30px);
    -webkit-backdrop-filter: blur(30px);
    border: 1px solid var(--color-border);
}

.glass-card {
    background: rgba(255, 255, 255, 0.03);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-xl);
    transition: all var(--transition-normal);
}

.glass-card:hover {
    background: rgba(255, 255, 255, 0.06);
    border-color: var(--color-primary-dim);
    box-shadow: var(--shadow-glow);
}

/* ========================================
   按鈕樣式
   ======================================== */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--radius-lg);
    font-family: var(--font-sans);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
    text-decoration: none;
}

.btn-primary {
    background: var(--color-primary);
    color: var(--color-bg);
    box-shadow: 0 4px 20px var(--color-primary-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 30px var(--color-primary-glow);
}

.btn-primary:active {
    transform: translateY(0);
}

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

.btn-secondary:hover {
    background: var(--color-surface-hover);
    border-color: var(--color-primary-dim);
}

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

.btn-ghost:hover {
    background: var(--color-surface);
    border-color: var(--color-primary-dim);
}

.btn-danger {
    background: linear-gradient(135deg, var(--color-error) 0%, #dc2626 100%);
    color: white;
}

.btn-danger:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 20px rgba(248, 113, 113, 0.4);
}

/* ========================================
   標籤樣式
   ======================================== */

.tag {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: var(--color-primary);
    color: var(--color-bg);
    font-size: 0.625rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    border-radius: 0.25rem;
}

/* ========================================
   標題樣式
   ======================================== */

.title-display {
    font-size: clamp(2.5rem, 8vw, 6rem);
    font-weight: 900;
    font-style: italic;
    text-transform: uppercase;
    letter-spacing: -0.02em;
    line-height: 0.95;
    color: var(--color-text);
}

.title-display .highlight {
    color: var(--color-primary);
}

.title-section {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 1rem;
}

/* ========================================
   動畫定義
   ======================================== */

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideInFromBottom {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes shine {
    0% {
        transform: skewX(-25deg) translateX(-250%);
    }

    100% {
        transform: skewX(-25deg) translateX(350%);
    }
}

@keyframes subtleZoom {
    0% {
        transform: scale(1.0);
    }

    100% {
        transform: scale(1.1);
    }
}

@keyframes pulse {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.5;
    }
}

@keyframes glow {

    0%,
    100% {
        box-shadow: 0 0 10px var(--color-primary-glow);
    }

    50% {
        box-shadow: 0 0 25px var(--color-primary-glow);
    }
}

@keyframes blink {

    0%,
    50% {
        opacity: 1;
    }

    51%,
    100% {
        opacity: 0;
    }
}

.animate-fade-in {
    animation: fadeIn 0.5s ease forwards;
}

.animate-slide-in {
    animation: slideInFromBottom 0.7s ease forwards;
}

.animate-shine::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 50%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transform: skewX(-25deg) translateX(-250%);
}

.animate-shine:hover::after {
    animation: shine 1s ease;
}

.animate-subtle-zoom {
    animation: subtleZoom 20s infinite alternate ease-in-out;
}

.animate-pulse {
    animation: pulse 2s infinite;
}

.animate-glow {
    animation: glow 2s infinite;
}

/* ========================================
   Modal 樣式
   ======================================== */

.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 1rem;
}

.modal.hidden {
    display: none;
}

.modal-content {
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: 2rem;
    max-width: 500px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    animation: fadeIn 0.3s ease;
}

.modal-content h2,
.modal-content h3 {
    color: var(--color-text);
    margin-bottom: 1rem;
}

.modal-content p {
    color: var(--color-text-secondary);
    margin-bottom: 1rem;
}

.modal-actions {
    display: flex;
    gap: 1rem;
    margin-top: 1.5rem;
    justify-content: center;
}

.close-button {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: transparent;
    border: none;
    color: var(--color-text-secondary);
    font-size: 1.5rem;
    cursor: pointer;
    transition: color var(--transition-fast);
}

.close-button:hover {
    color: var(--color-text);
}

/* ========================================
   Footer 樣式
   ======================================== */

footer {
    width: 100%;
    background: rgba(0, 0, 0, 0.5);
    border-top: 1px solid var(--color-border);
    padding: 1.5rem 0;
    margin-top: auto;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
    text-align: center;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

.footer-links a {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: 0.875rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: color var(--transition-fast);
}

.footer-links a:hover {
    color: var(--color-primary);
}

.footer-links svg {
    width: 1rem;
    height: 1rem;
}

.footer-copyright {
    color: var(--color-text-muted);
    font-size: 0.75rem;
}

/* ========================================
   表單元素
   ======================================== */

input[type="text"],
input[type="email"],
input[type="password"] {
    width: 100%;
    padding: 0.875rem 1rem;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text);
    font-family: var(--font-sans);
    font-size: 1rem;
    transition: all var(--transition-fast);
}

input[type="text"]:focus,
input[type="email"]:focus,
input[type="password"]:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-dim);
}

input::placeholder {
    color: var(--color-text-muted);
}

/* ========================================
   Spinner / Loading
   ======================================== */

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--color-border);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

.loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    padding: 2rem;
    color: var(--color-text-secondary);
}

/* ========================================
   工具類別
   ======================================== */

.hidden {
    display: none !important;
}

.text-primary {
    color: var(--color-primary);
}

.text-secondary {
    color: var(--color-text-secondary);
}

.text-muted {
    color: var(--color-text-muted);
}

.text-center {
    text-align: center;
}

.flex {
    display: flex;
}

.flex-col {
    flex-direction: column;
}

.items-center {
    align-items: center;
}

.justify-center {
    justify-content: center;
}

.justify-between {
    justify-content: space-between;
}

.gap-1 {
    gap: 0.25rem;
}

.gap-2 {
    gap: 0.5rem;
}

.gap-3 {
    gap: 0.75rem;
}

.gap-4 {
    gap: 1rem;
}

.gap-6 {
    gap: 1.5rem;
}

.gap-8 {
    gap: 2rem;
}

/* ========================================
   Mobile Back Button
   ======================================== */

.mobile-back-btn {
    display: none;
    align-items: center;
    gap: 0.5rem;
    background: transparent;
    border: none;
    color: var(--color-primary);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    margin-bottom: 1rem;
    padding: 0;
}

.mobile-back-btn:hover {
    text-decoration: underline;
}

@media (max-width: 768px) {
    .mobile-back-btn {
        display: flex;
    }
    
    .mobile-back-btn.hidden {
        display: none;
    }
}

/* ========================================
   響應式斷點
   ======================================== */

@media (max-width: 768px) {
    :root {
        --radius-xl: 1.25rem;
        --radius-2xl: 1.5rem;
    }

    .title-display {
        font-size: clamp(2rem, 10vw, 3rem);
    }

    .modal-content {
        padding: 1.5rem;
        margin: 1rem;
    }

    .footer-links {
        gap: 1rem;
    }
}