/* ====================
   烈焰觉醒 - 暗黑火焰主题
   ==================== */

:root {
    /* 火焰主色 */
    --color-primary: #FF4500;
    --color-primary-light: #FF6B1A;
    --color-primary-lighter: #FF8C42;
    --color-primary-dark: #CC3700;
    --color-primary-darker: #992900;
    /* 暗金强调色 */
    --color-gold: #FFD700;
    --color-gold-light: #FFE34D;
    --color-gold-dark: #B8860B;
    /* 血色辅助色 */
    --color-blood: #B91C1C;
    --color-blood-dark: #7F1D1D;
    /* 暗色背景 */
    --color-bg-darkest: #0A0604;
    --color-bg-dark: #14090A;
    --color-bg-card: #1F1410;
    --color-bg-card-hover: #2A1812;
    --color-bg-elevated: #2D1A14;
    /* 边框与分割 */
    --color-border: #3A2018;
    --color-border-light: #2A1812;
    --color-border-gold: rgba(255, 215, 0, 0.25);
    /* 文本颜色 */
    --color-text: #F5E6D3;
    --color-text-light: #C9A88A;
    --color-text-muted: #8B7355;
    --color-text-heading: #FFE4B5;
    --color-white: #FFFFFF;
    /* 状态色 */
    --color-success: #10B981;
    --color-warning: #F59E0B;
    --color-danger: #EF4444;
    --color-info: #60A5FA;

    --font-heading: 'ZCOOL KuaiLe', 'Noto Sans SC', 'Microsoft YaHei', sans-serif;
    --font-body: 'Noto Sans SC', 'Microsoft YaHei', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-code: 'JetBrains Mono', 'Courier New', monospace;

    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-lg: 1.125rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;
    --text-3xl: 1.875rem;
    --text-4xl: 2.25rem;
    --text-5xl: 3rem;
    --text-6xl: 3.75rem;

    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    --spacing-4xl: 6rem;

    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;

    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.4);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.5), 0 2px 4px -1px rgba(255, 69, 0, 0.08);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.6), 0 4px 6px -2px rgba(255, 69, 0, 0.12);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.7), 0 10px 10px -5px rgba(255, 69, 0, 0.15);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.8);
    --shadow-fire: 0 10px 30px -5px rgba(255, 69, 0, 0.45);
    --shadow-gold: 0 10px 30px -5px rgba(255, 215, 0, 0.4);

    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 300ms cubic-bezier(0.25, 0.8, 0.25, 1);
    --transition-slow: 500ms cubic-bezier(0.25, 0.8, 0.25, 1);

    --max-width: 1200px;
    --max-width-content: 900px;
}

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

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

body {
    font-family: var(--font-body);
    font-size: var(--text-base);
    line-height: 1.7;
    color: var(--color-text);
    background-color: var(--color-bg-darkest);
    background-image:
        radial-gradient(ellipse at top, rgba(255, 69, 0, 0.12) 0%, transparent 50%),
        radial-gradient(ellipse at bottom right, rgba(255, 215, 0, 0.05) 0%, transparent 50%),
        linear-gradient(180deg, #0A0604 0%, #14090A 100%);
    background-attachment: fixed;
    overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.25;
    margin-bottom: var(--spacing-md);
    color: var(--color-text-heading);
    text-shadow: 0 0 20px rgba(255, 69, 0, 0.15);
}

h1 {
    font-size: var(--text-5xl);
    letter-spacing: -0.02em;
}

h2 {
    font-size: var(--text-4xl);
    letter-spacing: -0.015em;
}

h3 {
    font-size: var(--text-2xl);
    letter-spacing: -0.01em;
}

h4 { font-size: var(--text-xl); }
h5 { font-size: var(--text-lg); }
h6 { font-size: var(--text-base); }

p {
    margin-bottom: var(--spacing-md);
    color: var(--color-text-light);
}

a {
    color: var(--color-primary-light);
    text-decoration: none;
    transition: color var(--transition-base);
}

a:hover {
    color: var(--color-primary-lighter);
}

ul, ol { list-style: none; }

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

code, pre {
    font-family: var(--font-code);
    background-color: rgba(255, 69, 0, 0.1);
    padding: var(--spacing-sm);
    border-radius: var(--radius-md);
    font-size: 0.9em;
    color: var(--color-gold-light);
    border: 1px solid var(--color-border);
}

pre {
    padding: var(--spacing-lg);
    overflow-x: auto;
}

::selection {
    background-color: rgba(255, 69, 0, 0.4);
    color: #FFFFFF;
}

::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}
::-webkit-scrollbar-track { background: var(--color-bg-dark); }
::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, var(--color-primary-dark), var(--color-blood-dark));
    border-radius: var(--radius-full);
}
::-webkit-scrollbar-thumb:hover { background: var(--color-primary); }

/* ====================
   布局容器
   ==================== */

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--spacing-lg) var(--spacing-md);
}

.content-wrapper {
    max-width: var(--max-width-content);
    margin: 0 auto;
    padding: var(--spacing-2xl) var(--spacing-lg);
}

.section {
    padding: var(--spacing-4xl) var(--spacing-lg);
    position: relative;
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
}

.section-title {
    font-size: var(--text-4xl);
    font-weight: 700;
    color: var(--color-text-heading);
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.02em;
    background: linear-gradient(135deg, #FFD700 0%, #FF4500 60%, #B91C1C 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: inline-block;
}

.section-subtitle {
    font-size: var(--text-lg);
    color: var(--color-text-light);
    max-width: 640px;
    margin: 0 auto;
}

.main-content {
    min-height: calc(100vh - 70px);
    padding-top: 70px;
}

/* ====================
   渐变背景
   ==================== */

.gradient-primary {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-blood-dark) 100%);
}

.gradient-hero {
    background:
        radial-gradient(ellipse at 30% 20%, rgba(255, 69, 0, 0.18) 0%, transparent 50%),
        radial-gradient(ellipse at 70% 80%, rgba(255, 215, 0, 0.08) 0%, transparent 50%),
        linear-gradient(180deg, var(--color-bg-darkest) 0%, var(--color-bg-dark) 100%);
    position: relative;
    overflow: hidden;
}

.gradient-hero::before {
    content: '';
    position: absolute;
    top: -30%;
    right: -5%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(255, 69, 0, 0.15) 0%, transparent 60%);
    border-radius: 50%;
    animation: float 8s ease-in-out infinite;
    pointer-events: none;
}

.gradient-hero::after {
    content: '';
    position: absolute;
    bottom: -20%;
    left: -5%;
    width: 450px;
    height: 450px;
    background: radial-gradient(circle, rgba(255, 215, 0, 0.08) 0%, transparent 60%);
    border-radius: 50%;
    animation: float 10s ease-in-out infinite reverse;
    pointer-events: none;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0); }
    50% { transform: translate(30px, -30px); }
}

.gradient-light {
    background: linear-gradient(180deg, var(--color-bg-dark) 0%, var(--color-bg-darkest) 100%);
}

.bg-gray-50 {
    background-color: var(--color-bg-dark);
}

.bg-gradient-mesh {
    background:
        radial-gradient(circle at 20% 30%, rgba(255, 69, 0, 0.08), transparent 40%),
        radial-gradient(circle at 80% 70%, rgba(255, 215, 0, 0.05), transparent 40%),
        var(--color-bg-darkest);
}

/* ====================
   文本样式
   ==================== */

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

.text-white { color: #FFFFFF; }
.text-gray { color: var(--color-text-light); }
.text-gray-dark { color: var(--color-text); }
.text-primary { color: var(--color-primary); }
.text-primary-light { color: var(--color-primary-light); }
.text-gold { color: var(--color-gold); }
.text-accent { color: var(--color-gold); }
.text-success { color: var(--color-success); }
.text-blood { color: var(--color-blood); }

.text-bold { font-weight: 700; }
.text-semibold { font-weight: 600; }
.text-medium { font-weight: 500; }

/* ====================
   按钮样式
   ==================== */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: 12px 28px;
    font-size: var(--text-base);
    font-weight: 600;
    font-family: var(--font-body);
    border: none;
    border-radius: var(--radius-lg);
    cursor: pointer;
    text-decoration: none;
    transition: all var(--transition-base);
    line-height: 1.5;
    white-space: nowrap;
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 50%, var(--color-blood-dark) 100%);
    color: #FFFFFF;
    box-shadow: 0 4px 14px 0 rgba(255, 69, 0, 0.4), inset 0 1px 0 rgba(255, 255, 255, 0.2);
    border: 1px solid rgba(255, 140, 66, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px 0 rgba(255, 69, 0, 0.6), inset 0 1px 0 rgba(255, 255, 255, 0.3);
    color: #FFFFFF;
}

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

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

.btn-secondary:hover {
    border-color: var(--color-primary);
    background-color: var(--color-bg-card-hover);
    transform: translateY(-2px);
    color: var(--color-primary-lighter);
}

.btn-gold {
    background: linear-gradient(135deg, var(--color-gold) 0%, var(--color-gold-dark) 100%);
    color: #1A0F0A;
    box-shadow: 0 4px 14px 0 rgba(255, 215, 0, 0.4), inset 0 1px 0 rgba(255, 255, 255, 0.3);
    border: 1px solid rgba(255, 215, 0, 0.5);
}

.btn-gold:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px 0 rgba(255, 215, 0, 0.6);
    color: #1A0F0A;
}

.btn-outline-white {
    background: transparent;
    color: var(--color-white);
    border: 2px solid rgba(255, 255, 255, 0.5);
}

.btn-outline-white:hover {
    background: rgba(255, 255, 255, 0.15);
    border-color: var(--color-white);
    transform: translateY(-2px);
    color: var(--color-white);
}

.btn-lg {
    padding: 16px 36px;
    font-size: var(--text-lg);
}

.btn-sm {
    padding: 8px 18px;
    font-size: var(--text-sm);
}

/* ====================
   卡片样式
   ==================== */

.card {
    background: linear-gradient(180deg, var(--color-bg-card) 0%, var(--color-bg-dark) 100%);
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-border);
    overflow: hidden;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-md);
}

.card:hover {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-lg), 0 0 30px rgba(255, 69, 0, 0.1);
    transform: translateY(-4px);
}

.card-feature {
    padding: var(--spacing-2xl);
    background: linear-gradient(180deg, var(--color-bg-card) 0%, var(--color-bg-dark) 100%);
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-border);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.card-feature::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-gold));
    opacity: 0;
    transition: opacity var(--transition-base);
}

.card-feature::after {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 50% 0%, rgba(255, 69, 0, 0.08), transparent 60%);
    opacity: 0;
    transition: opacity var(--transition-base);
    pointer-events: none;
}

.card-feature:hover {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-xl), 0 0 40px rgba(255, 69, 0, 0.15);
    transform: translateY(-6px);
}

.card-feature:hover::before,
.card-feature:hover::after {
    opacity: 1;
}

.card-feature-title {
    font-size: var(--text-xl);
    font-weight: 700;
    color: var(--color-text-heading);
    margin-bottom: var(--spacing-sm);
}

.card-feature-description {
    font-size: var(--text-base);
    color: var(--color-text-light);
    line-height: 1.7;
    margin-bottom: 0;
}

/* ====================
   响应式断点
   ==================== */

@media (max-width: 1024px) {
    html { font-size: 15px; }
    .container { padding: var(--spacing-md); }
    .section { padding: var(--spacing-3xl) var(--spacing-md); }
}

@media (max-width: 768px) {
    html { font-size: 14px; }
    h1 { font-size: var(--text-4xl); }
    h2, .section-title { font-size: var(--text-3xl); }
    h3 { font-size: var(--text-xl); }
    .section { padding: var(--spacing-2xl) var(--spacing-md); }
    .section-header { margin-bottom: var(--spacing-2xl); }
    .content-wrapper { padding: var(--spacing-xl) var(--spacing-md); }
    .btn { padding: 10px 22px; }
    .btn-lg { padding: 14px 28px; }
}

@media (max-width: 480px) {
    html { font-size: 13px; }
    h1 { font-size: var(--text-3xl); }
    h2, .section-title { font-size: var(--text-2xl); }
    h3 { font-size: var(--text-lg); }
}