/* ========================================
   蜀九香 · 成都老火锅  — 样式表
   ======================================== */

/* ---------- CSS 变量 ---------- */
:root {
    --red-900: #7f1d1d;
    --red-700: #b91c1c;
    --red-600: #dc2626;
    --red-500: #ef4444;
    --orange-500: #f97316;
    --orange-400: #fb923c;
    --gold-400: #fbbf24;
    --gold-500: #f59e0b;
    --dark: #1a0e0b;
    --dark-2: #2d1a14;
    --dark-3: #3d2620;
    --gray-100: #f5f3f0;
    --gray-200: #e5e0db;
    --gray-600: #6b5b55;
    --gray-800: #2d1a14;
    --white: #fffcf9;
    --shadow-sm: 0 4px 12px rgba(0,0,0,0.08);
    --shadow-md: 0 8px 30px rgba(0,0,0,0.12);
    --shadow-lg: 0 20px 60px rgba(0,0,0,0.2);
    --radius: 16px;
    --radius-sm: 8px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --font-serif: 'Noto Serif SC', serif;
    --font-sans: 'Inter', -apple-system, sans-serif;
}

/* ---------- 重置 & 基础 ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
    font-family: var(--font-sans);
    background: var(--white);
    color: var(--dark-2);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}
a { text-decoration: none; color: inherit; }
img { max-width: 100%; display: block; }
ul, ol { list-style: none; }
button, input, select, textarea { font-family: inherit; font-size: 1rem; outline: none; }
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ---------- 导航 ---------- */
.navbar {
    position: fixed;
    top: 0; left: 0; width: 100%;
    z-index: 1000;
    background: transparent;
    padding: 12px 0;
    transition: var(--transition);
}
.navbar.scrolled {
    background: rgba(26, 14, 11, 0.95);
    backdrop-filter: blur(12px);
    box-shadow: 0 2px 20px rgba(0,0,0,0.3);
    padding: 6px 0;
}
.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.logo {
    font-family: var(--font-serif);
    font-size: 1.6rem;
    font-weight: 900;
    color: var(--white);
    display: flex;
    align-items: center;
    gap: 8px;
}
.logo i { color: var(--orange-400); font-size: 1.4rem; }
.nav-links {
    display: flex;
    gap: 28px;
    align-items: center;
}
.nav-links a {
    color: rgba(255,255,255,0.85);
    font-weight: 500;
    font-size: 0.95rem;
    position: relative;
    padding: 4px 0;
    transition: var(--transition);
}
.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -2px; left: 0;
    width: 0; height: 2px;
    background: var(--orange-400);
    transition: var(--transition);
    border-radius: 2px;
}
.nav-links a:hover, .nav-links a.active { color: var(--white); }
.nav-links a:hover::after, .nav-links a.active::after { width: 100%; }
.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 6px;
}
.hamburger span {
    display: block;
    width: 26px;
    height: 2.5px;
    background: var(--white);
    border-radius: 4px;
    transition: var(--transition);
}
.hamburger.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- Hero ---------- */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: url('https://images.unsplash.com/photo-1563245372-f21724e3856d?w=1600&h=900&fit=crop') center/cover no-repeat;
    color: var(--white);
}
.hero-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(26,14,11,0.85) 0%, rgba(127,29,29,0.6) 100%);
}
.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    max-width: 720px;
    margin: 0 auto;
    padding: 100px 0 60px;
}
.hero-content h1 {
    font-family: var(--font-serif);
    font-size: 3.8rem;
    font-weight: 900;
    line-height: 1.15;
    margin-bottom: 20px;
    text-shadow: 0 4px 20px rgba(0,0,0,0.3);
}
.hero-content p {
    font-size: 1.2rem;
    color: rgba(255,255,255,0.85);
    margin-bottom: 36px;
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
}
.hero-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 50px;
}
.hero-stats {
    display: flex;
    justify-content: center;
    gap: 48px;
    font-size: 1rem;
    color: rgba(255,255,255,0.8);
}
.hero-stats span {
    display: block;
    font-family: var(--font-serif);
    font-size: 2rem;
    font-weight: 700;
    color: var(--gold-400);
}

/* ---------- 按钮 ---------- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 14px 34px;
    border-radius: 50px;
    font-weight: 600;
    font-size: 1rem;
    border: 2px solid transparent;
    cursor: pointer;
    transition: var(--transition);
    background: none;
}
.btn-primary {
    background: var(--red-600);
    color: var(--white);
    border-color: var(--red-600);
}
.btn-primary:hover {
    background: var(--red-700);
    border-color: var(--red-700);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(220,38,38,0.35);
}
.btn-outline {
    background: transparent;
    color: var(--white);
    border-color: rgba(255,255,255,0.6);
}
.btn-outline:hover {
    background: rgba(255,255,255,0.12);
    border-color: var(--white);
    transform: translateY(-2px);
}
.btn-block { width: 100%; justify-content: center; }

/* ---------- 通用 Section ---------- */
.section {
    padding: 100px 0;
}
.section-title {
    text-align: center;
    margin-bottom: 56px;
}
.section-title .subtitle {
    display: inline-block;
    background: var(--red-600);
    color: var(--white);
    padding: 4px 18px;
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 1px;
    margin-bottom: 12px;
}
.section-title h2 {
    font-family: var(--font-serif);
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 12px;
}
.section-title p {
    color: var(--gray-600);
    max-width: 560px;
    margin: 0 auto;
}
.section-title.light h2 { color: var(--white); }
.section-title.light p { color: rgba(255,255,255,0.7); }
.section-title.light .subtitle { background: var(--gold-500); color: var(--dark); }

.bg-dark { background: var(--dark); }
.bg-light { background: var(--gray-100); }

/* ---------- 品牌故事 ---------- */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}
.about-image {
    position: relative;
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}
.about-image img {
    width: 100%;
    height: 380px;
    object-fit: cover;
    transition: var(--transition);
}
.about-image:hover img { transform: scale(1.03); }
.about-badge {
    position: absolute;
    bottom: 20px; left: 20px;
    background: var(--red-600);
    color: var(--white);
    padding: 8px 20px;
    border-radius: 50px;
    font-weight: 600;
    font-size: 0.9rem;
    box-shadow: var(--shadow-sm);
}
.about-text h3 {
    font-family: var(--font-serif);
    font-size: 1.8rem;
    margin-bottom: 16px;
    color: var(--dark);
}
.about-text p {
    color: var(--gray-600);
    margin-bottom: 16px;
}

/* ---------- 锅底网格 ---------- */
.menu-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 30px;
}
.menu-card {
    background: rgba(255,255,255,0.06);
    backdrop-filter: blur(4px);
    border-radius: var(--radius);
    padding: 32px 24px 24px;
    text-align: center;
    border: 1px solid rgba(255,255,255,0.08);
    transition: var(--transition);
    color: var(--white);
}
.menu-card:hover {
    background: rgba(255,255,255,0.12);
    transform: translateY(-6px);
    box-shadow: 0 12px 40px rgba(0,0,0,0.3);
}
.menu-card .icon {
    font-size: 3rem;
    margin-bottom: 16px;
}
.menu-card h3 {
    font-family: var(--font-serif);
    font-size: 1.4rem;
    margin-bottom: 8px;
}
.menu-card .desc {
    font-size: 0.9rem;
    color: rgba(255,255,255,0.6);
    margin-bottom: 14px;
    min-height: 48px;
}
.menu-card .price {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--gold-400);
}
.menu-card .price small { font-size: 0.8rem; font-weight: 400; color: rgba(255,255,255,0.5); }

/* ---------- 特色网格 ---------- */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 24px;
}
.feature-card {
    background: var(--white);
    border-radius: var(--radius);
    padding: 32px 24px;
    text-align: center;
    box-shadow: var(--shadow-sm);
    border: 1px solid rgba(0,0,0,0.04);
    transition: var(--transition);
}
.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}
.feature-card i {
    font-size: 2.4rem;
    color: var(--red-600);
    margin-bottom: 16px;
}
.feature-card h4 {
    font-family: var(--font-serif);
    font-size: 1.2rem;
    margin-bottom: 8px;
    color: var(--dark);
}
.feature-card p {
    font-size: 0.9rem;
    color: var(--gray-600);
}

/* ---------- 评价网格 ---------- */
.review-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 28px;
}
.review-card {
    background: var(--white);
    border-radius: var(--radius);
    padding: 28px 24px;
    box-shadow: var(--shadow-sm);
    border-left: 4px solid var(--red-600);
    transition: var(--transition);
}
.review-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}
.review-card .stars {
    color: var(--gold-500);
    margin-bottom: 10px;
    font-size: 1rem;
}
.review-card blockquote {
    font-style: italic;
    color: var(--gray-600);
    margin-bottom: 16px;
    line-height: 1.6;
}
.review-card .author {
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 600;
    color: var(--dark);
}
.review-card .author img {
    width: 40px; height: 40px;
    border-radius: 50%;
    object-fit: cover;
}

/* ---------- 预定表单 ---------- */
.reserve-card {
    max-width: 640px;
    margin: 0 auto;
    background: var(--white);
    border-radius: var(--radius);
    padding: 48px 40px;
    box-shadow: var(--shadow-lg);
    border: 1px solid rgba(0,0,0,0.04);
}
.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}
.form-group {
    margin-bottom: 20px;
    text-align: left;
}
.form-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 6px;
    color: var(--dark-2);
    font-size: 0.9rem;
}
.form-group label i { color: var(--red-600); margin-right: 6px; }
.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-sm);
    background: var(--white);
    transition: var(--transition);
    font-size: 0.95rem;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--red-500);
    box-shadow: 0 0 0 4px rgba(239,68,68,0.12);
}
.form-group textarea { resize: vertical; }
.error-msg {
    display: block;
    font-size: 0.8rem;
    color: var(--red-600);
    margin-top: 4px;
    min-height: 20px;
}
.form-tip {
    text-align: center;
    font-size: 0.85rem;
    color: var(--gray-600);
    margin-top: 14px;
}
.reserve-success {
    display: none;
    text-align: center;
    padding: 30px 0;
}
.reserve-success i {
    font-size: 4rem;
    color: #10b981;
    margin-bottom: 16px;
}
.reserve-success h3 { font-size: 1.8rem; margin-bottom: 8px; }
.reserve-success p { font-size: 1.1rem; color: var(--gray-600); }
.reserve-success span { font-size: 0.9rem; color: var(--gray-600); }

/* ---------- 页脚 ---------- */
.footer {
    background: var(--dark);
    color: rgba(255,255,255,0.8);
    padding: 70px 0 0;
}
.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1.5fr;
    gap: 48px;
    padding-bottom: 40px;
    border-bottom: 1px solid rgba(255,255,255,0.08);
}
.footer-brand h3 {
    font-family: var(--font-serif);
    font-size: 1.4rem;
    color: var(--white);
    margin-bottom: 12px;
}
.footer-brand h3 i { color: var(--orange-400); }
.footer-brand p { margin-bottom: 18px; font-size: 0.95rem; }
.social {
    display: flex;
    gap: 14px;
}
.social a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px; height: 40px;
    border-radius: 50%;
    background: rgba(255,255,255,0.08);
    color: var(--white);
    transition: var(--transition);
    font-size: 1.1rem;
}
.social a:hover { background: var(--red-600); transform: scale(1.1); }
.footer-links h4,
.footer-contact h4 {
    color: var(--white);
    margin-bottom: 16px;
    font-size: 1rem;
}
.footer-links a {
    display: block;
    margin-bottom: 10px;
    color: rgba(255,255,255,0.6);
    transition: var(--transition);
}
.footer-links a:hover { color: var(--orange-400); padding-left: 4px; }
.footer-contact p {
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.9rem;
}
.footer-contact i { color: var(--orange-400); width: 16px; }
.footer-bottom {
    padding: 20px 0;
    text-align: center;
    font-size: 0.85rem;
    color: rgba(255,255,255,0.4);
}

/* ---------- 回到顶部 ---------- */
.back-to-top {
    position: fixed;
    bottom: 40px; right: 40px;
    width: 50px; height: 50px;
    border-radius: 50%;
    background: var(--red-600);
    color: var(--white);
    border: none;
    font-size: 1.2rem;
    cursor: pointer;
    box-shadow: var(--shadow-md);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: var(--transition);
    z-index: 999;
}
.back-to-top.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}
.back-to-top:hover {
    background: var(--red-700);
    transform: scale(1.08);
}

/* ---------- 响应式 ---------- */
@media (max-width: 992px) {
    .hero-content h1 { font-size: 2.8rem; }
    .about-grid { grid-template-columns: 1fr; gap: 40px; }
    .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
    .nav-links {
        position: fixed;
        top: 0; right: -100%;
        width: 280px;
        height: 100vh;
        background: rgba(26,14,11,0.98);
        backdrop-filter: blur(16px);
        flex-direction: column;
        justify-content: center;
        gap: 32px;
        padding: 40px;
        transition: var(--transition);
        box-shadow: -10px 0 40px rgba(0,0,0,0.5);
    }
    .nav-links.open { right: 0; }
    .hamburger { display: flex; }

    .hero { min-height: 90vh; }
    .hero-content h1 { font-size: 2.2rem; }
    .hero-content p { font-size: 1rem; }
    .hero-stats { gap: 24px; }
    .hero-stats span { font-size: 1.5rem; }

    .section-title h2 { font-size: 1.8rem; }
    .form-row { grid-template-columns: 1fr; }
    .reserve-card { padding: 32px 20px; }
    .footer-grid { grid-template-columns: 1fr; gap: 32px; }
    .back-to-top { bottom: 20px; right: 20px; width: 44px; height: 44px; }
}

@media (max-width: 480px) {
    .hero-content h1 { font-size: 1.8rem; }
    .hero-actions .btn { padding: 12px 24px; font-size: 0.9rem; }
    .menu-grid { grid-template-columns: 1fr; }
    .review-grid { grid-template-columns: 1fr; }
}