/* =============================================
   Jinyi Trade - Main Stylesheet
   ============================================= */

/* --- Reset & Base --- */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --navy-900: #0a1628;
    --navy-800: #0f1f3a;
    --navy-700: #15294d;
    --navy-600: #1a3360;
    --navy-500: #1f3d73;
    --navy-400: #2a4f8a;
    --gold-500: #c9a44b;
    --gold-400: #d4b366;
    --gold-300: #dfc280;
    --gold-200: #e9d19a;
    --gold-100: #f4e0b5;
    --white: #ffffff;
    --gray-50: #f8f9fb;
    --gray-100: #f0f2f5;
    --gray-200: #e2e6ea;
    --gray-300: #c5cad3;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-display: 'Playfair Display', Georgia, serif;
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 20px rgba(0,0,0,0.10);
    --shadow-lg: 0 10px 40px rgba(0,0,0,0.12);
    --shadow-xl: 0 20px 60px rgba(0,0,0,0.15);
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

body {
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.7;
    color: var(--gray-700);
    background: var(--white);
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

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

ul { list-style: none; }

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

/* --- Header --- */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(10, 22, 40, 0.95);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(255,255,255,0.08);
    transition: var(--transition);
}

.header.scrolled {
    background: rgba(10, 22, 40, 0.98);
    box-shadow: var(--shadow-lg);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 20px;
    color: var(--white);
    letter-spacing: -0.3px;
}

.logo-icon {
    color: var(--gold-500);
    font-size: 22px;
}

.logo-text {
    font-family: var(--font-display);
}

.nav-list {
    display: flex;
    gap: 4px;
    align-items: center;
}

.nav-link {
    padding: 8px 16px;
    font-size: 14px;
    font-weight: 500;
    color: rgba(255,255,255,0.75);
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

.nav-link:hover,
.nav-link.active {
    color: var(--white);
    background: rgba(255,255,255,0.08);
}

.mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.mobile-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--white);
    border-radius: 2px;
    transition: var(--transition);
}

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 32px;
    font-size: 15px;
    font-weight: 600;
    border-radius: var(--radius-md);
    border: 2px solid transparent;
    cursor: pointer;
    transition: var(--transition);
    letter-spacing: 0.2px;
}

.btn-primary {
    background: var(--gold-500);
    color: var(--navy-900);
    border-color: var(--gold-500);
}

.btn-primary:hover {
    background: var(--gold-400);
    border-color: var(--gold-400);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(201, 164, 75, 0.35);
}

.btn-outline {
    background: transparent;
    color: var(--white);
    border-color: rgba(255,255,255,0.35);
}

.btn-outline:hover {
    background: rgba(255,255,255,0.1);
    border-color: var(--white);
    transform: translateY(-2px);
}

.btn-gold {
    background: var(--gold-500);
    color: var(--navy-900);
    border-color: var(--gold-500);
    font-size: 16px;
    padding: 16px 40px;
}

.btn-gold:hover {
    background: var(--gold-400);
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(201, 164, 75, 0.4);
}

/* --- Hero --- */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, var(--navy-900) 0%, var(--navy-700) 40%, var(--navy-600) 100%);
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(201,164,75,0.12) 0%, transparent 70%);
    border-radius: 50%;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(42,79,138,0.2) 0%, transparent 70%);
    border-radius: 50%;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(ellipse at 20% 50%, transparent 0%, var(--navy-900) 70%),
        url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    opacity: 0.6;
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 800px;
    padding: 120px 0 80px;
}

.hero-tag {
    display: inline-block;
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--gold-400);
    margin-bottom: 24px;
    padding: 6px 16px;
    border: 1px solid rgba(201,164,75,0.3);
    border-radius: 100px;
    background: rgba(201,164,75,0.08);
}

.hero-title {
    font-family: var(--font-display);
    font-size: 56px;
    font-weight: 700;
    line-height: 1.15;
    color: var(--white);
    margin-bottom: 24px;
    letter-spacing: -0.5px;
}

.hero-desc {
    font-size: 18px;
    line-height: 1.7;
    color: rgba(255,255,255,0.7);
    margin-bottom: 40px;
    max-width: 620px;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

/* --- Stats Bar --- */
.stats-bar {
    background: var(--navy-800);
    border-bottom: 3px solid var(--gold-500);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0;
}

.stat-item {
    text-align: center;
    padding: 40px 20px;
    border-right: 1px solid rgba(255,255,255,0.06);
}

.stat-item:last-child {
    border-right: none;
}

.stat-number {
    display: block;
    font-family: var(--font-display);
    font-size: 44px;
    font-weight: 700;
    color: var(--gold-500);
    line-height: 1.2;
}

.stat-label {
    display: block;
    font-size: 13px;
    font-weight: 500;
    color: rgba(255,255,255,0.55);
    margin-top: 8px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* --- Section Common --- */
.section {
    padding: 100px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-title {
    font-family: var(--font-display);
    font-size: 40px;
    font-weight: 700;
    color: var(--navy-900);
    margin-bottom: 16px;
    letter-spacing: -0.3px;
}

.section-title.light {
    color: var(--white);
}

.section-subtitle {
    font-size: 17px;
    color: var(--gray-500);
    max-width: 560px;
    margin: 0 auto;
    line-height: 1.6;
}

/* --- Services --- */
.services {
    background: var(--gray-50);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.service-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 36px 32px;
    border: 1px solid var(--gray-200);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--gold-500), var(--gold-300));
    opacity: 0;
    transition: var(--transition);
}

.service-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-xl);
    border-color: transparent;
}

.service-card:hover::before {
    opacity: 1;
}

.service-icon {
    color: var(--gold-500);
    margin-bottom: 20px;
}

.service-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--navy-900);
    margin-bottom: 12px;
}

.service-desc {
    font-size: 14px;
    color: var(--gray-500);
    line-height: 1.7;
    margin-bottom: 16px;
}

.service-features {
    list-style: none;
}

.service-features li {
    font-size: 13px;
    color: var(--gray-600);
    padding: 5px 0;
    padding-left: 20px;
    position: relative;
}

.service-features li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 12px;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--gold-500);
}

/* --- About --- */
.about {
    background: var(--white);
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 72px;
    align-items: center;
}

.about-img-placeholder {
    background: var(--navy-800);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--gray-200);
}

.about-content .section-title {
    margin-bottom: 20px;
}

.about-lead {
    font-size: 18px;
    font-weight: 500;
    color: var(--navy-700);
    margin-bottom: 16px;
    line-height: 1.6;
}

.about-text {
    font-size: 15px;
    color: var(--gray-600);
    line-height: 1.75;
    margin-bottom: 16px;
}

.about-highlights {
    display: flex;
    gap: 32px;
    margin-top: 28px;
}

.highlight {
    display: flex;
    flex-direction: column;
}

.highlight-number {
    font-family: var(--font-display);
    font-size: 32px;
    font-weight: 700;
    color: var(--gold-500);
}

.highlight-label {
    font-size: 12px;
    font-weight: 500;
    color: var(--gray-500);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* --- Solutions --- */
.solutions {
    background: var(--navy-800);
}

.solutions .section-title {
    color: var(--white);
}

.solutions .section-subtitle {
    color: rgba(255,255,255,0.55);
}

.industries-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.industry-item {
    background: rgba(255,255,255,0.04);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: var(--radius-md);
    padding: 32px;
    transition: var(--transition);
}

.industry-item:hover {
    background: rgba(255,255,255,0.07);
    border-color: var(--gold-500);
}

.industry-number {
    display: block;
    font-family: var(--font-display);
    font-size: 36px;
    font-weight: 700;
    color: var(--gold-500);
    margin-bottom: 12px;
    line-height: 1;
}

.industry-name {
    font-size: 16px;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 10px;
}

.industry-desc {
    font-size: 14px;
    color: rgba(255,255,255,0.5);
    line-height: 1.65;
}

/* --- CTA Banner --- */
.cta-banner {
    background: linear-gradient(135deg, var(--navy-900), var(--navy-700));
    text-align: center;
    padding: 80px 0;
    position: relative;
    overflow: hidden;
}

.cta-banner::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(201,164,75,0.08) 0%, transparent 70%);
    pointer-events: none;
}

.cta-content {
    position: relative;
    z-index: 2;
}

.cta-content h2 {
    font-family: var(--font-display);
    font-size: 36px;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 16px;
}

.cta-content p {
    font-size: 17px;
    color: rgba(255,255,255,0.6);
    margin-bottom: 32px;
}

/* --- Contact --- */
.contact {
    background: var(--white);
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.3fr;
    gap: 56px;
    align-items: start;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 28px;
}

.contact-item {
    display: flex;
    gap: 16px;
    align-items: flex-start;
}

.contact-item svg {
    color: var(--gold-500);
    flex-shrink: 0;
    margin-top: 3px;
}

.contact-item h4 {
    font-size: 14px;
    font-weight: 700;
    color: var(--navy-900);
    margin-bottom: 4px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.contact-item p {
    font-size: 15px;
    color: var(--gray-600);
    line-height: 1.6;
}

.contact-form {
    background: var(--gray-50);
    border-radius: var(--radius-lg);
    padding: 36px;
    border: 1px solid var(--gray-200);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--gray-700);
    margin-bottom: 6px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    font-size: 15px;
    font-family: var(--font-sans);
    color: var(--gray-800);
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-sm);
    transition: var(--transition);
    outline: none;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--gold-500);
    box-shadow: 0 0 0 3px rgba(201,164,75,0.1);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--gray-400);
}

/* --- Footer --- */
.footer {
    background: var(--navy-900);
    padding: 64px 0 0;
    border-top: 3px solid var(--gold-500);
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1fr;
    gap: 48px;
    padding-bottom: 48px;
}

.footer-brand .logo {
    margin-bottom: 16px;
}

.footer-desc {
    font-size: 14px;
    color: rgba(255,255,255,0.45);
    line-height: 1.7;
}

.footer-links h4 {
    font-size: 14px;
    font-weight: 600;
    color: var(--white);
    margin-bottom: 16px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.footer-links ul {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.footer-links li a {
    font-size: 14px;
    color: rgba(255,255,255,0.45);
    transition: var(--transition);
}

.footer-links li a:hover {
    color: var(--gold-400);
}

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.06);
    padding: 20px 0;
    text-align: center;
}

.footer-bottom p {
    font-size: 13px;
    color: rgba(255,255,255,0.3);
}

/* --- Animations --- */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* --- Responsive --- */
@media (max-width: 1024px) {
    .services-grid,
    .industries-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

    .about-grid {
        grid-template-columns: 1fr;
        gap: 48px;
    }

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

@media (max-width: 768px) {
    .hero-title {
        font-size: 36px;
    }

    .hero-desc {
        font-size: 16px;
    }

    .section {
        padding: 64px 0;
    }

    .section-title {
        font-size: 30px;
    }

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

    .stat-item:nth-child(2) {
        border-right: none;
    }

    .services-grid,
    .industries-grid {
        grid-template-columns: 1fr;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .nav {
        position: fixed;
        top: 0;
        right: -100%;
        width: 75%;
        max-width: 320px;
        height: 100vh;
        background: var(--navy-800);
        padding: 100px 32px 32px;
        transition: var(--transition);
        z-index: 999;
        box-shadow: var(--shadow-xl);
    }

    .nav.open {
        right: 0;
    }

    .nav-list {
        flex-direction: column;
        gap: 4px;
    }

    .nav-link {
        display: block;
        padding: 12px 16px;
        font-size: 16px;
    }

    .mobile-toggle {
        display: flex;
        position: relative;
        z-index: 1001;
    }

    .about-highlights {
        flex-wrap: wrap;
        gap: 20px;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 28px;
    }

    .hero-buttons {
        flex-direction: column;
    }

    .hero-buttons .btn {
        width: 100%;
    }

    .btn-gold {
        width: 100%;
    }
}