/* ============================================
   Longkong Acupuncture Center — Stylesheet
   ============================================ */

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

:root {
    --teal-900: #0d3b3e;
    --teal-800: #134f52;
    --teal-700: #1a6b6f;
    --teal-600: #1f8084;
    --teal-500: #269e9e;
    --teal-100: #d0eaea;
    --teal-50:  #eaf6f6;
    --slate-950: #0a0f14;
    --slate-900: #0f172a;
    --slate-800: #1e293b;
    --slate-700: #334155;
    --slate-600: #475569;
    --slate-500: #64748b;
    --slate-400: #94a3b8;
    --slate-300: #cbd5e1;
    --slate-200: #e2e8f0;
    --slate-100: #f1f5f9;
    --slate-50:  #f8fafc;
    --white: #ffffff;
    --font-serif: 'Cormorant Garamond', Georgia, serif;
    --font-sans: 'Montserrat', 'Helvetica Neue', Arial, sans-serif;
    --transition: 0.3s ease;
}

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

body {
    font-family: var(--font-sans);
    font-weight: 300;
    color: var(--slate-800);
    background: var(--white);
    line-height: 1.7;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

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

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

ul {
    list-style: none;
}

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

/* --- Typography --- */
h1, h2, h3, h4 {
    font-family: var(--font-serif);
    font-weight: 400;
    line-height: 1.2;
    color: var(--slate-900);
}

.lead {
    font-size: 1.125rem;
    color: var(--slate-600);
    line-height: 1.8;
}

.section-label {
    display: inline-block;
    font-family: var(--font-sans);
    font-size: 0.7rem;
    font-weight: 500;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--teal-600);
    margin-bottom: 16px;
}

.section-label-light {
    color: var(--teal-100);
}

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 32px;
    font-family: var(--font-sans);
    font-size: 0.8rem;
    font-weight: 500;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    border-radius: 2px;
    transition: all 0.3s ease;
    cursor: pointer;
    border: 1px solid transparent;
}

.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(13, 59, 62, 0.25);
}

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

.btn-outline:hover {
    background: var(--white);
    color: var(--teal-900);
    border-color: var(--white);
}

.btn-white {
    background: var(--white);
    color: var(--teal-900);
    border-color: var(--white);
}

.btn-white: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(255,255,255,0.4);
}

.btn-outline-light:hover {
    background: var(--white);
    color: var(--teal-900);
    border-color: var(--white);
}

.btn-full {
    width: 100%;
}

/* --- Navbar --- */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 20px 0;
    transition: all 0.4s ease;
}

.navbar.scrolled {
    background: rgba(255,255,255,0.97);
    backdrop-filter: blur(12px);
    padding: 14px 0;
    box-shadow: 0 1px 0 var(--slate-200);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    flex-direction: column;
    line-height: 1.1;
}

.logo-text {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-weight: 400;
    color: var(--white);
    letter-spacing: 0.02em;
    transition: color 0.4s ease;
}

.logo-sub {
    font-family: var(--font-sans);
    font-size: 0.6rem;
    font-weight: 400;
    letter-spacing: 0.25em;
    text-transform: uppercase;
    color: rgba(255,255,255,0.7);
    transition: color 0.4s ease;
}

.navbar.scrolled .logo-text {
    color: var(--slate-900);
}

.navbar.scrolled .logo-sub {
    color: var(--slate-500);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 40px;
}

.nav-links a {
    font-size: 0.78rem;
    font-weight: 400;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: rgba(255,255,255,0.85);
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 1px;
    background: currentColor;
    transition: width 0.3s ease;
}

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

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

.navbar.scrolled .nav-links a {
    color: var(--slate-600);
}

.navbar.scrolled .nav-links a:hover {
    color: var(--teal-700);
}

.nav-cta {
    border: 1px solid rgba(255,255,255,0.4) !important;
    padding: 10px 24px;
    border-radius: 2px;
    transition: all 0.3s ease !important;
}

.nav-cta::after {
    display: none;
}

.nav-cta:hover {
    background: var(--white) !important;
    color: var(--teal-900) !important;
}

.navbar.scrolled .nav-cta {
    border-color: var(--teal-700) !important;
    color: var(--teal-700) !important;
}

.navbar.scrolled .nav-cta:hover {
    background: var(--teal-700) !important;
    color: var(--white) !important;
}

/* Mobile toggle */
.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: 1.5px;
    background: var(--white);
    transition: all 0.3s ease;
}

.navbar.scrolled .mobile-toggle span {
    background: var(--slate-800);
}

.mobile-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 4px);
}

.mobile-toggle.active span:nth-child(2) {
    opacity: 0;
}

.mobile-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -4px);
}

/* --- Hero --- */
.hero {
    position: relative;
    height: 100vh;
    min-height: 700px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    z-index: 0;
}

.hero-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(
        135deg,
        rgba(10, 15, 20, 0.82) 0%,
        rgba(13, 59, 62, 0.70) 50%,
        rgba(10, 15, 20, 0.78) 100%
    );
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    max-width: 720px;
    padding: 0 24px;
}

.hero-tag {
    font-size: 0.72rem;
    font-weight: 500;
    letter-spacing: 0.25em;
    text-transform: uppercase;
    color: var(--teal-100);
    margin-bottom: 24px;
}

.hero-headline {
    font-family: var(--font-serif);
    font-size: clamp(3.5rem, 8vw, 6.5rem);
    font-weight: 300;
    color: var(--white);
    line-height: 1.05;
    margin-bottom: 28px;
    letter-spacing: -0.01em;
}

.hero-headline br {
    display: none;
}

.hero-sub {
    font-size: 1.05rem;
    color: rgba(255,255,255,0.75);
    line-height: 1.8;
    margin-bottom: 40px;
    max-width: 520px;
    margin-left: auto;
    margin-right: auto;
}

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

.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 2;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: rgba(255,255,255,0.5);
    font-size: 0.65rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
}

.scroll-line {
    width: 1px;
    height: 48px;
    background: linear-gradient(to bottom, rgba(255,255,255,0.5), transparent);
    animation: scrollPulse 2s ease-in-out infinite;
}

@keyframes scrollPulse {
    0%, 100% { opacity: 1; transform: scaleY(1); }
    50% { opacity: 0.4; transform: scaleY(0.6); }
}

/* --- Intro / About --- */
.intro {
    padding: 140px 0;
    background: var(--white);
}

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

.intro-image {
    position: relative;
}

.intro-image img {
    width: 100%;
    height: 560px;
    object-fit: cover;
    border-radius: 2px;
}

.intro-image-accent {
    position: absolute;
    bottom: -24px;
    right: -24px;
    width: 200px;
    height: 200px;
    border: 1px solid var(--teal-100);
    border-radius: 2px;
    z-index: -1;
}

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

.intro-text h2 {
    font-size: clamp(2.2rem, 4vw, 3.2rem);
    margin-bottom: 28px;
    color: var(--slate-900);
}

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

.intro-text p {
    color: var(--slate-600);
    margin-bottom: 16px;
    font-size: 0.95rem;
}

.intro-stats {
    display: flex;
    align-items: center;
    gap: 32px;
    margin-top: 48px;
    padding-top: 40px;
    border-top: 1px solid var(--slate-200);
}

.stat {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.stat-number {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    color: var(--teal-700);
    font-weight: 400;
}

.stat-label {
    font-size: 0.72rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--slate-500);
}

.stat-divider {
    width: 1px;
    height: 48px;
    background: var(--slate-200);
}

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

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

.section-header h2 {
    font-size: clamp(2rem, 4vw, 2.8rem);
    margin-bottom: 20px;
}

.section-subtitle {
    font-size: 0.95rem;
    color: var(--slate-500);
    line-height: 1.8;
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.service-card {
    background: var(--white);
    padding: 48px 36px;
    border-radius: 2px;
    border: 1px solid var(--slate-100);
    transition: all 0.4s ease;
}

.service-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 20px 60px rgba(0,0,0,0.06);
    border-color: var(--teal-100);
}

.service-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--teal-100);
    border-radius: 50%;
    margin-bottom: 28px;
    color: var(--teal-700);
    transition: all 0.3s ease;
}

.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: 1.35rem;
    margin-bottom: 14px;
    color: var(--slate-900);
}

.service-card p {
    font-size: 0.88rem;
    color: var(--slate-500);
    line-height: 1.8;
}

/* --- Approach --- */
.approach {
    padding: 140px 0;
    background: var(--white);
}

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

.approach-content .section-label {
    margin-bottom: 20px;
}

.approach-content h2 {
    font-size: clamp(2rem, 4vw, 2.8rem);
    margin-bottom: 24px;
}

.approach-content .lead {
    margin-bottom: 48px;
}

.approach-steps {
    display: flex;
    flex-direction: column;
    gap: 40px;
}

.approach-step {
    display: flex;
    gap: 28px;
    align-items: flex-start;
}

.step-number {
    font-family: var(--font-serif);
    font-size: 2rem;
    font-weight: 300;
    color: var(--teal-100);
    line-height: 1;
    min-width: 48px;
}

.approach-step h4 {
    font-family: var(--font-serif);
    font-size: 1.2rem;
    margin-bottom: 8px;
    color: var(--slate-900);
}

.approach-step p {
    font-size: 0.88rem;
    color: var(--slate-500);
    line-height: 1.7;
}

.approach-image img {
    width: 100%;
    height: 640px;
    object-fit: cover;
    border-radius: 2px;
}

/* --- CTA Section --- */
.cta-section {
    position: relative;
    padding: 120px 0;
    overflow: hidden;
}

.cta-bg {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, var(--teal-900) 0%, var(--slate-900) 100%);
}

.cta-bg::before {
    content: '';
    position: absolute;
    inset: 0;
    background: url('https://images.pexels.com/photos/6129585/pexels-photo-6129585.jpeg?auto=compress&cs=tinysrgb&fit=crop&w=1920&h=800') center/cover no-repeat;
    opacity: 0.12;
}

.cta-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 640px;
    margin: 0 auto;
}

.cta-content h2 {
    font-size: clamp(2.2rem, 5vw, 3.5rem);
    color: var(--white);
    margin-bottom: 24px;
}

.cta-content p {
    font-size: 1rem;
    color: rgba(255,255,255,0.7);
    line-height: 1.8;
    margin-bottom: 40px;
}

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

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

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

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

.contact-info h2 {
    font-size: clamp(2rem, 4vw, 2.8rem);
    margin-bottom: 20px;
}

.contact-info > p {
    color: var(--slate-500);
    margin-bottom: 48px;
}

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

.contact-item {
    display: flex;
    gap: 20px;
    align-items: flex-start;
}

.contact-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--slate-200);
    border-radius: 50%;
    color: var(--teal-700);
    flex-shrink: 0;
}

.contact-item strong {
    display: block;
    font-family: var(--font-sans);
    font-size: 0.72rem;
    font-weight: 500;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--slate-400);
    margin-bottom: 6px;
}

.contact-item p {
    font-size: 0.95rem;
    color: var(--slate-700);
    line-height: 1.6;
}

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

.contact-item a:hover {
    color: var(--teal-500);
    text-decoration: underline;
}

/* Form */
.contact-form-wrap {
    background: var(--white);
    padding: 48px;
    border-radius: 2px;
    border: 1px solid var(--slate-100);
}

.contact-form h3 {
    font-family: var(--font-serif);
    font-size: 1.6rem;
    margin-bottom: 32px;
    color: var(--slate-900);
}

.form-group {
    margin-bottom: 24px;
}

.form-group label {
    display: block;
    font-size: 0.72rem;
    font-weight: 500;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--slate-500);
    margin-bottom: 8px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 14px 16px;
    font-family: var(--font-sans);
    font-size: 0.9rem;
    font-weight: 300;
    color: var(--slate-800);
    background: var(--slate-50);
    border: 1px solid var(--slate-200);
    border-radius: 2px;
    outline: none;
    transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--teal-500);
    background: var(--white);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.form-note {
    font-size: 0.78rem;
    color: var(--slate-400);
    margin-top: 16px;
    text-align: center;
}

.form-success {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 60px 48px;
    gap: 16px;
}

.form-success svg {
    color: var(--teal-600);
}

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

.form-success p {
    font-size: 0.9rem;
    color: var(--slate-500);
}

/* --- Footer --- */
.footer {
    background: var(--slate-900);
    padding: 80px 0 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 60px;
    padding-bottom: 60px;
}

.footer-brand .logo-text {
    color: var(--white);
}

.footer-brand .logo-sub {
    color: var(--slate-500);
}

.footer-brand p {
    font-size: 0.88rem;
    color: var(--slate-400);
    line-height: 1.8;
    margin-top: 20px;
    max-width: 280px;
}

.footer-links strong,
.footer-contact strong {
    display: block;
    font-size: 0.72rem;
    font-weight: 500;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--slate-400);
    margin-bottom: 20px;
}

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

.footer-links a,
.footer-contact a {
    font-size: 0.88rem;
    color: var(--slate-500);
}

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

.footer-contact p {
    font-size: 0.88rem;
    color: var(--slate-500);
    line-height: 1.7;
}

.footer-bottom {
    border-top: 1px solid var(--slate-800);
    padding: 24px 0;
}

.footer-bottom p {
    font-size: 0.78rem;
    color: var(--slate-600);
}

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

    .reveal.visible {
        opacity: 1;
        transform: translateY(0);
    }

    .reveal-delay-1 { transition-delay: 0.1s; }
    .reveal-delay-2 { transition-delay: 0.2s; }
    .reveal-delay-3 { transition-delay: 0.3s; }
    .reveal-delay-4 { transition-delay: 0.4s; }
    .reveal-delay-5 { transition-delay: 0.5s; }
}

/* --- Responsive --- */
@media (max-width: 1024px) {
    .intro-grid,
    .approach-split,
    .contact-grid {
        gap: 48px;
    }

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

@media (max-width: 768px) {
    .mobile-toggle {
        display: flex;
    }

    .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 280px;
        height: 100vh;
        background: var(--white);
        flex-direction: column;
        justify-content: center;
        gap: 28px;
        padding: 40px;
        transition: right 0.4s ease;
        box-shadow: -8px 0 40px rgba(0,0,0,0.1);
    }

    .nav-links.open {
        right: 0;
    }

    .nav-links a {
        color: var(--slate-700) !important;
        font-size: 0.85rem;
    }

    .nav-links a:hover {
        color: var(--teal-700) !important;
    }

    .nav-cta {
        border-color: var(--teal-700) !important;
        color: var(--teal-700) !important;
    }

    .hero-headline br {
        display: block;
    }

    .intro-grid,
    .approach-split,
    .contact-grid {
        grid-template-columns: 1fr;
    }

    .intro-image {
        order: -1;
    }

    .intro-image img {
        height: 400px;
    }

    .intro-image-accent {
        display: none;
    }

    .approach-image img {
        height: 400px;
    }

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

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .contact-form-wrap {
        padding: 32px 24px;
    }

    .intro,
    .approach {
        padding: 80px 0;
    }

    .services,
    .cta-section,
    .contact {
        padding: 80px 0;
    }

    .intro-stats {
        flex-direction: column;
        align-items: flex-start;
        gap: 20px;
    }

    .stat-divider {
        display: none;
    }
}

@media (max-width: 480px) {
    .hero-actions {
        flex-direction: column;
        align-items: center;
    }

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

    .cta-actions {
        flex-direction: column;
        align-items: center;
    }

    .cta-actions .btn {
        width: 100%;
        max-width: 280px;
    }
}