/* ==========================================================================
   炎旭文化科技 - 主样式
   主题：深色奢华（金棕配色）
   ========================================================================== */

:root {
    /* 颜色 - 从图片中提取的深棕黑 + 金色调 */
    --color-bg: #0d0805;
    --color-bg-2: #1a110a;
    --color-bg-3: #2a1a0e;
    --color-surface: #1f1410;
    --color-surface-2: #2a1d14;

    --color-gold: #c9a961;
    --color-gold-bright: #e4c578;
    --color-gold-dim: #8a7140;
    --color-bronze: #7b2e00;
    --color-red: #8b1a1a;
    --color-red-bright: #c9302c;

    --color-text: #f5ecd9;
    --color-text-dim: #b8a886;
    --color-text-muted: #7a6e58;
    --color-line: rgba(201, 169, 97, 0.2);

    /* 字体 */
    --font-serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "STSong", "SimSun", serif;
    --font-sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;

    /* 间距 */
    --container-width: 1200px;
    --section-padding: 48px 0;

    /* 动效 */
    --ease: cubic-bezier(0.4, 0, 0.2, 1);
    --duration: 0.4s;
}

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

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-sans);
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.7;
    font-size: 16px;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

img, svg {
    display: block;
    max-width: 100%;
}

a {
    color: inherit;
    text-decoration: none;
    transition: color var(--duration) var(--ease);
}

.container {
    width: 100%;
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* ==========================================================================
   顶部导航
   ========================================================================== */

.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(13, 8, 5, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-line);
}

.nav-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.brand {
    display: flex;
    align-items: baseline;
    gap: 8px;
    font-family: var(--font-serif);
}

.brand-mark {
    font-size: 24px;
    font-weight: 700;
    color: var(--color-gold-bright);
    letter-spacing: 2px;
}

.brand-text {
    font-size: 14px;
    color: var(--color-text-dim);
    letter-spacing: 4px;
}

.nav-menu {
    display: flex;
    gap: 36px;
}

.nav-menu a {
    font-size: 14px;
    color: var(--color-text-dim);
    position: relative;
    padding: 4px 0;
}

.nav-menu a::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--color-gold);
    transition: width var(--duration) var(--ease);
}

.nav-menu a:hover {
    color: var(--color-gold-bright);
}

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

/* ==========================================================================
   Hero 主视觉
   ========================================================================== */

.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 90px 0 100px;
    overflow: hidden;
    text-align: center;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse at top, rgba(123, 46, 0, 0.4) 0%, transparent 50%),
        radial-gradient(ellipse at bottom, rgba(201, 169, 97, 0.15) 0%, transparent 60%),
        linear-gradient(180deg, #0d0805 0%, #1a110a 50%, #0d0805 100%);
}

.hero-bg::before {
    content: "";
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(201, 169, 97, 0.04) 1px, transparent 1px),
        linear-gradient(90deg, rgba(201, 169, 97, 0.04) 1px, transparent 1px);
    background-size: 80px 80px;
    opacity: 0.5;
}

.hero-overlay {
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at center, transparent 30%, rgba(13, 8, 5, 0.8) 100%);
}

.hero-inner {
    position: relative;
    z-index: 3;
}

.hero-eyebrow {
    font-size: 13px;
    letter-spacing: 6px;
    color: var(--color-gold);
    margin-bottom: 20px;
    font-weight: 500;
}

.hero-title {
    font-family: var(--font-serif);
    font-size: clamp(36px, 7vw, 72px);
    font-weight: 700;
    line-height: 1.15;
    letter-spacing: 4px;
    margin-bottom: 20px;
    color: var(--color-text);
}

.title-line {
    display: block;
    background: linear-gradient(180deg, #f5ecd9 0%, #c9a961 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-divider {
    width: 60px;
    height: 1px;
    margin: 0 auto 20px;
    background: linear-gradient(90deg, transparent, var(--color-gold), transparent);
}

.hero-subtitle {
    font-size: clamp(14px, 2vw, 17px);
    color: var(--color-text-dim);
    line-height: 1.9;
    margin-bottom: 32px;
}

.hero-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 36px;
    font-size: 14px;
    line-height: 1;
    letter-spacing: 2px;
    border: 1px solid transparent;
    cursor: pointer;
    transition: all var(--duration) var(--ease);
    font-family: var(--font-sans);
    white-space: nowrap;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-gold) 0%, var(--color-gold-dim) 100%);
    color: #0d0805;
    font-weight: 600;
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--color-gold-bright) 0%, var(--color-gold) 100%);
    transform: translateY(-2px);
    box-shadow: 0 12px 32px rgba(201, 169, 97, 0.3);
}

.btn-ghost {
    background: transparent;
    border-color: var(--color-gold);
    color: var(--color-gold-bright);
}

.btn-ghost:hover {
    background: var(--color-gold);
    color: #0d0805;
}

.btn-large {
    padding: 18px 48px;
    font-size: 15px;
}

.scroll-hint {
    position: absolute;
    bottom: 32px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    font-size: 11px;
    letter-spacing: 4px;
    color: var(--color-text-muted);
    pointer-events: none;
}

.scroll-line {
    width: 1px;
    height: 40px;
    background: linear-gradient(180deg, var(--color-gold), transparent);
    animation: scrollPulse 2s ease-in-out infinite;
}

@keyframes scrollPulse {
    0%, 100% { opacity: 0.3; transform: translateY(0); }
    50% { opacity: 1; transform: translateY(8px); }
}

/* ==========================================================================
   通用 Section
   ========================================================================== */

.section {
    padding: var(--section-padding);
    position: relative;
}

.section-head {
    text-align: center;
    margin-bottom: 28px;
}

.section-eyebrow {
    font-size: 12px;
    letter-spacing: 6px;
    color: var(--color-gold);
    margin-bottom: 16px;
    font-weight: 500;
}

.section-eyebrow.light {
    color: var(--color-gold-bright);
}

.section-title {
    font-family: var(--font-serif);
    font-size: clamp(32px, 5vw, 48px);
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 24px;
    letter-spacing: 4px;
}

.section-divider {
    width: 60px;
    height: 1px;
    margin: 0 auto;
    background: linear-gradient(90deg, transparent, var(--color-gold), transparent);
}

.section-sub {
    color: var(--color-text-dim);
    margin-top: 24px;
    font-size: 16px;
}

/* ==========================================================================
   关于我们
   ========================================================================== */

.section-about {
    background: var(--color-bg-2);
    border-top: 1px solid var(--color-line);
    border-bottom: 1px solid var(--color-line);
}

.about-grid {
    display: grid;
    grid-template-columns: 1.4fr 1fr;
    gap: 32px;
    align-items: center;
}

.about-text .lead {
    font-size: 22px;
    font-family: var(--font-serif);
    line-height: 1.8;
    margin-bottom: 24px;
    color: var(--color-text);
}

.about-text em {
    color: var(--color-gold-bright);
    font-style: normal;
    border-bottom: 1px solid var(--color-gold-dim);
    padding-bottom: 2px;
}

.about-text p {
    color: var(--color-text-dim);
    margin-bottom: 16px;
    line-height: 2;
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
}

.stat-item {
    padding: 20px 16px;
    background: var(--color-surface);
    border: 1px solid var(--color-line);
    text-align: center;
    position: relative;
    transition: all var(--duration) var(--ease);
}

.stat-item:hover {
    border-color: var(--color-gold);
    transform: translateY(-4px);
}

.stat-item::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 24px;
    height: 1px;
    background: var(--color-gold);
}

.stat-item::after {
    content: "";
    position: absolute;
    bottom: 0;
    right: 0;
    width: 24px;
    height: 1px;
    background: var(--color-gold);
}

.stat-num {
    font-family: var(--font-serif);
    font-size: 32px;
    font-weight: 700;
    color: var(--color-gold-bright);
    margin-bottom: 6px;
    line-height: 1;
}

.stat-num sup {
    font-size: 24px;
    color: var(--color-gold);
    margin-left: 4px;
}

.stat-label {
    font-size: 13px;
    letter-spacing: 2px;
    color: var(--color-text-dim);
}

/* ==========================================================================
   业务领域
   ========================================================================== */

.business-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
}

.biz-card {
    padding: 22px 20px;
    background: var(--color-surface);
    border: 1px solid var(--color-line);
    transition: all var(--duration) var(--ease);
    position: relative;
    overflow: hidden;
}

.biz-card::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--color-gold), transparent);
    transform: translateX(-100%);
    transition: transform var(--duration) var(--ease);
}

.biz-card:hover {
    background: var(--color-surface-2);
    border-color: var(--color-gold-dim);
    transform: translateY(-6px);
}

.biz-card:hover::before {
    transform: translateX(0);
}

.biz-icon {
    width: 36px;
    height: 36px;
    margin-bottom: 12px;
    color: var(--color-gold);
}

.biz-icon svg {
    width: 100%;
    height: 100%;
    stroke: currentColor;
}

.biz-card h3 {
    font-family: var(--font-serif);
    font-size: 18px;
    color: var(--color-text);
    margin-bottom: 8px;
    font-weight: 600;
}

.biz-card p {
    color: var(--color-text-dim);
    font-size: 14px;
    line-height: 1.9;
}

/* ==========================================================================
   核心优势
   ========================================================================== */

.section-advantage {
    background: var(--color-bg-2);
    border-top: 1px solid var(--color-line);
    border-bottom: 1px solid var(--color-line);
}

.advantage-list {
    max-width: 900px;
    margin: 0 auto;
}

.adv-row {
    display: grid;
    grid-template-columns: 100px 1fr;
    gap: 36px;
    padding: 18px 0;
    border-bottom: 1px solid var(--color-line);
    transition: all var(--duration) var(--ease);
}

.adv-row:last-child {
    border-bottom: none;
}

.adv-row:hover {
    padding-left: 12px;
}

.adv-num {
    font-family: var(--font-serif);
    font-size: 30px;
    font-weight: 700;
    color: var(--color-gold-dim);
    line-height: 1;
}

.adv-row:hover .adv-num {
    color: var(--color-gold-bright);
}

.adv-content h3 {
    font-family: var(--font-serif);
    font-size: 22px;
    color: var(--color-text);
    margin-bottom: 8px;
    font-weight: 600;
}

.adv-content p {
    color: var(--color-text-dim);
    font-size: 15px;
    line-height: 1.9;
}

/* ==========================================================================
   企业愿景
   ========================================================================== */

.section-vision {
    padding: 60px 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.vision-bg {
    position: absolute;
    inset: 0;
    background:
        linear-gradient(135deg, #1a110a 0%, #2a1a0e 50%, #1a110a 100%);
}

.vision-bg::before {
    content: "";
    position: absolute;
    inset: 0;
    background:
        radial-gradient(circle at 20% 50%, rgba(123, 46, 0, 0.4) 0%, transparent 50%),
        radial-gradient(circle at 80% 50%, rgba(201, 169, 97, 0.2) 0%, transparent 50%);
}

.vision-inner {
    position: relative;
    z-index: 2;
}

.vision-quote {
    font-family: var(--font-serif);
    font-size: clamp(24px, 3.8vw, 36px);
    font-weight: 500;
    line-height: 1.8;
    color: var(--color-text);
    margin: 24px auto 32px;
    max-width: 900px;
    letter-spacing: 2px;
}

.vision-quote em {
    font-style: normal;
    color: var(--color-gold-bright);
    position: relative;
}

.vision-tags {
    display: flex;
    justify-content: center;
    gap: 16px;
    flex-wrap: wrap;
}

.vision-tags span {
    padding: 8px 24px;
    border: 1px solid var(--color-gold-dim);
    color: var(--color-gold-bright);
    font-size: 14px;
    letter-spacing: 4px;
    transition: all var(--duration) var(--ease);
}

.vision-tags span:hover {
    background: var(--color-gold);
    color: #0d0805;
    border-color: var(--color-gold);
}

/* ==========================================================================
   联系我们
   ========================================================================== */

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 28px;
    max-width: 1000px;
    margin: 0 auto;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.contact-item {
    padding: 14px 18px;
    background: var(--color-surface);
    border-left: 2px solid var(--color-gold);
    transition: all var(--duration) var(--ease);
}

.contact-item:hover {
    background: var(--color-surface-2);
    padding-left: 32px;
}

.contact-label {
    font-size: 12px;
    letter-spacing: 3px;
    color: var(--color-gold);
    margin-bottom: 8px;
    text-transform: uppercase;
}

.contact-value {
    font-size: 18px;
    color: var(--color-text);
    font-family: var(--font-serif);
}

.contact-cta {
    padding: 22px;
    background: linear-gradient(135deg, var(--color-surface) 0%, var(--color-bg-3) 100%);
    border: 1px solid var(--color-line);
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.cta-text {
    color: var(--color-text-dim);
    line-height: 1.9;
    margin-bottom: 24px;
    font-size: 14px;
}

/* ==========================================================================
   页脚
   ========================================================================== */

.site-footer {
    background: #050302;
    border-top: 1px solid var(--color-line);
    padding: 60px 0 32px;
}

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

.footer-brand {
    display: inline-flex;
    align-items: baseline;
    gap: 8px;
    margin-bottom: 16px;
    font-family: var(--font-serif);
}

.footer-desc {
    color: var(--color-text-muted);
    font-size: 13px;
    margin-bottom: 32px;
    letter-spacing: 1px;
}

.footer-divider {
    width: 200px;
    height: 1px;
    margin: 0 auto 24px;
    background: linear-gradient(90deg, transparent, var(--color-gold-dim), transparent);
}

.footer-meta {
    display: flex;
    flex-direction: column;
    gap: 8px;
    align-items: center;
}

.copyright,
.icp {
    font-size: 12px;
    color: var(--color-text-muted);
    letter-spacing: 1px;
}

.icp a {
    color: var(--color-text-dim);
    transition: color var(--duration) var(--ease);
}

.icp a:hover {
    color: var(--color-gold-bright);
}

/* ==========================================================================
   响应式
   ========================================================================== */

@media (max-width: 1024px) {
    .about-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .business-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .contact-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }
}

@media (max-width: 768px) {
    :root {
        --section-padding: 40px 0;
    }

    .container {
        padding: 0 20px;
    }

    .nav-menu {
        display: none;
    }

    .nav-inner {
        height: 60px;
        justify-content: center;
    }

    .hero {
        min-height: 85vh;
        padding: 70px 0 60px;
    }

    .hero-title {
        letter-spacing: 2px;
    }

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

    .adv-row {
        grid-template-columns: 50px 1fr;
        gap: 16px;
        padding: 14px 0;
    }

    .adv-num {
        font-size: 22px;
    }

    .adv-content h3 {
        font-size: 17px;
    }

    .section-vision {
        padding: 44px 0;
    }

    .vision-quote {
        line-height: 1.7;
    }
}

@media (max-width: 480px) {
    .about-stats {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
    }

    .stat-item {
        padding: 24px 12px;
    }

    .stat-num {
        font-size: 36px;
    }

    .contact-cta {
        padding: 28px 24px;
    }
}

/* ==========================================================================
   滚动入场动画
   ========================================================================== */

.section-head,
.about-text,
.about-stats,
.biz-card,
.adv-row,
.contact-item,
.contact-cta,
.vision-quote,
.stat-item {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}

.section-head.visible,
.about-text.visible,
.about-stats.visible,
.biz-card.visible,
.adv-row.visible,
.contact-item.visible,
.contact-cta.visible,
.vision-quote.visible,
.stat-item.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Hero 子元素初始隐藏态，避免 JS 加载前的闪烁 */
.hero-inner > * {
    opacity: 0;
    transform: translateY(16px);
    transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
}