/* ===================================
   Yun Tong Driving School — Styles
   =================================== */

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

:root {
    --teal-900: #042f2e;
    --teal-800: #0a4a47;
    --teal-700: #0d6b65;
    --teal-600: #0f8a80;
    --teal-500: #14b8a6;
    --teal-400: #2dd4bf;
    --teal-100: #ccfbf1;
    --teal-50:  #f0fdfa;
    --slate-950: #050a0f;
    --slate-900: #0b1120;
    --slate-800: #131d2e;
    --slate-700: #1e2d45;
    --slate-600: #334155;
    --slate-500: #475569;
    --slate-400: #94a3b8;
    --slate-300: #cbd5e1;
    --slate-200: #e2e8f0;
    --slate-100: #f1f5f9;
    --slate-50:  #f8fafc;
    --white:     #ffffff;
    --font-serif: 'Playfair Display', Georgia, serif;
    --font-sans:  'Inter', system-ui, sans-serif;
    --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-sans);
    color: var(--slate-800);
    background: var(--white);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

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

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

ul { list-style: none; }

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* --- Typography --- */
.section-tag {
    font-family: var(--font-sans);
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--teal-600);
    margin-bottom: 12px;
}

.section-title {
    font-family: var(--font-serif);
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
    line-height: 1.15;
    color: var(--slate-900);
    margin-bottom: 20px;
}

.lead {
    font-size: 1.125rem;
    line-height: 1.75;
    color: var(--slate-600);
    max-width: 560px;
}

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 32px;
    font-family: var(--font-sans);
    font-size: 0.9375rem;
    font-weight: 500;
    border-radius: 4px;
    border: 1.5px solid transparent;
    cursor: pointer;
    transition: all 0.3s var(--ease-out);
    white-space: nowrap;
}

.btn-primary {
    background: var(--teal-700);
    color: var(--white);
    border-color: var(--teal-700);
}

.btn-primary:hover {
    background: var(--teal-800);
    border-color: var(--teal-800);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(10, 74, 71, 0.3);
}

.btn-secondary {
    background: transparent;
    color: var(--white);
    border-color: rgba(255,255,255,0.4);
}

.btn-secondary:hover {
    background: rgba(255,255,255,0.1);
    border-color: var(--white);
}

.btn-light {
    background: var(--white);
    color: var(--teal-800);
    border-color: var(--white);
}

.btn-light:hover {
    background: var(--slate-100);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0,0,0,0.2);
}

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

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

.btn-full {
    width: 100%;
}

/* --- Navbar --- */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 0 24px;
    transition: all 0.4s var(--ease-out);
}

.navbar.scrolled {
    background: rgba(5, 10, 15, 0.95);
    backdrop-filter: blur(12px);
    box-shadow: 0 1px 0 rgba(255,255,255,0.05);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 80px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    z-index: 1001;
}

.logo-mark {
    width: 40px;
    height: 40px;
    background: var(--teal-500);
    color: var(--white);
    font-family: var(--font-serif);
    font-size: 0.875rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 4px;
    letter-spacing: 0.02em;
}

.logo-text {
    font-family: var(--font-serif);
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--white);
    letter-spacing: -0.01em;
}

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

.nav-menu a {
    font-size: 0.875rem;
    font-weight: 500;
    color: rgba(255,255,255,0.75);
    transition: color 0.25s;
    letter-spacing: 0.01em;
}

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

.nav-cta {
    background: var(--teal-500);
    color: var(--white) !important;
    padding: 10px 22px;
    border-radius: 4px;
    font-weight: 600 !important;
    transition: all 0.3s var(--ease-out) !important;
}

.nav-cta:hover {
    background: var(--teal-400) !important;
    color: var(--slate-900) !important;
    transform: translateY(-1px);
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    z-index: 1001;
}

.hamburger {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--white);
    position: relative;
    transition: all 0.3s;
}

.hamburger::before,
.hamburger::after {
    content: '';
    position: absolute;
    width: 24px;
    height: 2px;
    background: var(--white);
    transition: all 0.3s;
}

.hamburger::before { top: -7px; }
.hamburger::after  { top: 7px; }

.nav-toggle.active .hamburger {
    background: transparent;
}

.nav-toggle.active .hamburger::before {
    top: 0;
    transform: rotate(45deg);
}

.nav-toggle.active .hamburger::after {
    top: 0;
    transform: rotate(-45deg);
}

/* --- Hero --- */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    z-index: 0;
}

.hero-bg img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.hero-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(
        135deg,
        rgba(5, 10, 15, 0.88) 0%,
        rgba(10, 74, 71, 0.72) 50%,
        rgba(5, 10, 15, 0.85) 100%
    );
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 1200px;
    margin: 0 auto;
    padding: 120px 24px 80px;
}

.hero-tag {
    font-family: var(--font-sans);
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--teal-400);
    margin-bottom: 24px;
    opacity: 0;
    animation: fadeUp 0.8s var(--ease-out) 0.2s forwards;
}

.hero-headline {
    font-family: var(--font-serif);
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 700;
    line-height: 1.08;
    color: var(--white);
    max-width: 860px;
    margin-bottom: 28px;
    letter-spacing: -0.02em;
    opacity: 0;
    animation: fadeUp 0.8s var(--ease-out) 0.4s forwards;
}

.hero-sub {
    font-size: 1.1875rem;
    line-height: 1.7;
    color: rgba(255,255,255,0.72);
    max-width: 560px;
    margin-bottom: 40px;
    opacity: 0;
    animation: fadeUp 0.8s var(--ease-out) 0.6s forwards;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    opacity: 0;
    animation: fadeUp 0.8s var(--ease-out) 0.8s forwards;
}

.hero-scroll {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: rgba(255,255,255,0.4);
    font-size: 0.75rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.scroll-line {
    width: 1px;
    height: 48px;
    background: linear-gradient(to bottom, rgba(255,255,255,0.4), transparent);
    animation: scrollPulse 2s ease-in-out infinite;
}

@keyframes fadeUp {
    from { opacity: 0; transform: translateY(30px); }
    to   { opacity: 1; transform: translateY(0); }
}

@keyframes scrollPulse {
    0%, 100% { opacity: 0.4; transform: scaleY(1); }
    50%       { opacity: 1;   transform: scaleY(1.2); }
}

/* --- Intro --- */
.intro {
    padding: 120px 0;
    background: var(--white);
}

.intro-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.intro-text .section-title {
    margin-bottom: 24px;
}

.intro-text .lead {
    margin-bottom: 20px;
}

.intro-text p {
    color: var(--slate-600);
    line-height: 1.8;
    margin-bottom: 16px;
}

.intro-stats {
    display: flex;
    gap: 48px;
    margin-top: 48px;
    padding-top: 40px;
    border-top: 1px solid var(--slate-200);
}

.stat-number {
    display: block;
    font-family: var(--font-serif);
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--teal-700);
    line-height: 1;
    margin-bottom: 6px;
}

.stat-label {
    font-size: 0.8125rem;
    color: var(--slate-500);
    letter-spacing: 0.02em;
}

.intro-image {
    position: relative;
}

.intro-image img {
    width: 100%;
    height: 500px;
    object-fit: cover;
    border-radius: 4px;
}

.intro-image::before {
    content: '';
    position: absolute;
    top: -20px;
    right: -20px;
    width: 100%;
    height: 100%;
    border: 2px solid var(--teal-200);
    border-radius: 4px;
    z-index: -1;
}

/* --- Services --- */
.services {
    padding: 120px 0;
    background: var(--slate-50);
}

.section-header {
    text-align: center;
    max-width: 640px;
    margin: 0 auto 64px;
}

.section-header .section-title {
    margin-bottom: 16px;
}

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

.service-card {
    background: var(--white);
    padding: 40px 32px;
    border-radius: 4px;
    border: 1px solid var(--slate-200);
    transition: all 0.4s var(--ease-out);
}

.service-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 16px 48px rgba(0,0,0,0.08);
    border-color: var(--teal-200);
}

.service-icon {
    width: 64px;
    height: 64px;
    background: var(--teal-50);
    border: 1px solid var(--teal-100);
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--teal-700);
    margin-bottom: 24px;
    transition: all 0.3s;
}

.service-card:hover .service-icon {
    background: var(--teal-700);
    border-color: var(--teal-700);
    color: var(--white);
}

.service-card h3 {
    font-family: var(--font-serif);
    font-size: 1.375rem;
    font-weight: 700;
    color: var(--slate-900);
    margin-bottom: 12px;
    line-height: 1.3;
}

.service-card p {
    font-size: 0.9375rem;
    line-height: 1.75;
    color: var(--slate-600);
}

/* --- Process --- */
.process {
    padding: 120px 0;
    background: var(--slate-900);
}

.process .section-tag {
    color: var(--teal-400);
}

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

.process .section-header {
    text-align: center;
    max-width: 640px;
    margin: 0 auto 72px;
}

.process-steps {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 32px;
}

.process-step {
    position: relative;
    padding: 32px 24px;
}

.process-step::after {
    content: '';
    position: absolute;
    top: 52px;
    right: -16px;
    width: 32px;
    height: 2px;
    background: var(--teal-700);
}

.process-step:last-child::after {
    display: none;
}

.step-number {
    font-family: var(--font-serif);
    font-size: 3rem;
    font-weight: 700;
    color: var(--teal-700);
    line-height: 1;
    margin-bottom: 20px;
    opacity: 0.6;
}

.process-step h3 {
    font-family: var(--font-serif);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 12px;
    line-height: 1.3;
}

.process-step p {
    font-size: 0.9375rem;
    line-height: 1.75;
    color: var(--slate-400);
}

/* --- CTA Strip --- */
.cta-strip {
    padding: 100px 0;
    background: var(--teal-800);
    position: relative;
    overflow: hidden;
}

.cta-strip::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(45,212,191,0.15) 0%, transparent 70%);
    border-radius: 50%;
}

.cta-content {
    position: relative;
    text-align: center;
    max-width: 680px;
    margin: 0 auto;
}

.cta-content h2 {
    font-family: var(--font-serif);
    font-size: clamp(2rem, 4vw, 2.75rem);
    font-weight: 700;
    color: var(--white);
    line-height: 1.2;
    margin-bottom: 20px;
}

.cta-content p {
    font-size: 1.125rem;
    color: rgba(255,255,255,0.7);
    margin-bottom: 36px;
    line-height: 1.7;
}

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

/* --- Contact --- */
.contact {
    padding: 120px 0;
    background: var(--white);
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: start;
}

.contact-info .section-title {
    margin-bottom: 20px;
}

.contact-info > p {
    margin-bottom: 40px;
}

.contact-details {
    display: flex;
    flex-direction: column;
    gap: 24px;
    margin-bottom: 32px;
}

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

.contact-icon {
    width: 44px;
    height: 44px;
    min-width: 44px;
    background: var(--teal-50);
    border: 1px solid var(--teal-100);
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--teal-700);
}

.contact-label {
    display: block;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--slate-400);
    margin-bottom: 2px;
}

.contact-item a,
.contact-item span {
    font-size: 1rem;
    color: var(--slate-700);
    transition: color 0.2s;
}

.contact-item a:hover {
    color: var(--teal-700);
}

.map-container {
    border-radius: 4px;
    overflow: hidden;
    border: 1px solid var(--slate-200);
}

/* --- Contact Form --- */
.contact-form-wrapper {
    background: var(--slate-50);
    border: 1px solid var(--slate-200);
    border-radius: 4px;
    padding: 40px;
}

.contact-form-wrapper h3 {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--slate-900);
    margin-bottom: 28px;
}

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

.form-group label {
    display: block;
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--slate-700);
    margin-bottom: 6px;
    letter-spacing: 0.02em;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 14px;
    font-family: var(--font-sans);
    font-size: 0.9375rem;
    color: var(--slate-800);
    background: var(--white);
    border: 1.5px solid var(--slate-200);
    border-radius: 4px;
    transition: border-color 0.2s, box-shadow 0.2s;
    outline: none;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--teal-500);
    box-shadow: 0 0 0 3px rgba(20, 184, 166, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

.form-success {
    text-align: center;
    padding: 40px 20px;
}

.form-success svg {
    color: var(--teal-600);
    margin: 0 auto 16px;
}

.form-success h4 {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    color: var(--slate-900);
    margin-bottom: 8px;
}

.form-success p {
    color: var(--slate-600);
    font-size: 0.9375rem;
}

/* --- Footer --- */
.footer {
    background: var(--slate-950);
    padding: 72px 0 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1.5fr;
    gap: 48px;
    padding-bottom: 56px;
    border-bottom: 1px solid var(--slate-800);
}

.footer-brand {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-brand .logo-mark {
    width: 48px;
    height: 48px;
    font-size: 1rem;
}

.footer-brand .logo-text {
    font-size: 1.25rem;
}

.footer-brand p {
    font-size: 0.9375rem;
    color: var(--slate-500);
    line-height: 1.7;
    max-width: 280px;
}

.footer-links h4,
.footer-contact h4 {
    font-family: var(--font-sans);
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--slate-400);
    margin-bottom: 20px;
}

.footer-links ul {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-links a {
    font-size: 0.9375rem;
    color: var(--slate-500);
    transition: color 0.2s;
}

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

.footer-contact p {
    font-size: 0.9375rem;
    color: var(--slate-500);
    line-height: 1.8;
    margin-bottom: 4px;
}

.footer-contact a {
    color: var(--slate-400);
    transition: color 0.2s;
}

.footer-contact a:hover {
    color: var(--teal-400);
}

.footer-bottom {
    padding: 24px 0;
    text-align: center;
}

.footer-bottom p {
    font-size: 0.8125rem;
    color: var(--slate-600);
}

/* --- Scroll Reveal (progressive enhancement) --- */
@media (prefers-reduced-motion: no-preference) {
    .reveal {
        opacity: 0;
        transform: translateY(24px);
        transition: opacity 0.7s var(--ease-out), transform 0.7s var(--ease-out);
    }
    .reveal.visible {
        opacity: 1;
        transform: translateY(0);
    }
}

/* --- Responsive --- */
@media (max-width: 1024px) {
    .services-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .process-steps {
        grid-template-columns: repeat(2, 1fr);
    }
    .process-step::after {
        display: none;
    }
    .intro-grid,
    .contact-grid {
        grid-template-columns: 1fr;
        gap: 48px;
    }
    .intro-image { order: -1; }
    .intro-image img { height: 360px; }
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 280px;
        height: 100vh;
        background: var(--slate-950);
        flex-direction: column;
        justify-content: center;
        gap: 28px;
        padding: 40px;
        transition: right 0.4s var(--ease-out);
        box-shadow: -8px 0 32px rgba(0,0,0,0.3);
    }
    .nav-menu.open { right: 0; }
    .nav-menu a {
        font-size: 1.125rem;
        color: rgba(255,255,255,0.8);
    }
    .nav-toggle { display: block; }
    .services-grid { grid-template-columns: 1fr; }
    .process-steps { grid-template-columns: 1fr; }
    .intro-stats { flex-direction: column; gap: 24px; }
    .intro-image::before { display: none; }
    .hero-headline { font-size: clamp(2rem, 8vw, 3rem); }
    .cta-actions { flex-direction: column; align-items: center; }
    .contact-form-wrapper { padding: 28px; }
    .footer-grid { grid-template-columns: 1fr; gap: 36px; }
}

@media (max-width: 480px) {
    .container { padding: 0 16px; }
    .hero-content { padding: 100px 16px 60px; }
    .intro, .services, .process, .contact { padding: 80px 0; }
    .hero-actions { flex-direction: column; }
    .hero-actions .btn { width: 100%; justify-content: center; }
}