/* ========================================
   KORU Wellness — Stylesheet
   Teal + Slate Grey | Confident Corporate
   ======================================== */

/* CSS Custom Properties */
:root {
    --teal-50: #f0fdfa;
    --teal-100: #ccfbf1;
    --teal-200: #99f6e4;
    --teal-300: #5eead4;
    --teal-400: #2dd4bf;
    --teal-500: #14b8a6;
    --teal-600: #0d9488;
    --teal-700: #0f766e;
    --teal-800: #115e59;
    --teal-900: #134e4a;
    
    --slate-50: #f8fafc;
    --slate-100: #f1f5f9;
    --slate-200: #e2e8f0;
    --slate-300: #cbd5e1;
    --slate-400: #94a3b8;
    --slate-500: #64748b;
    --slate-600: #475569;
    --slate-700: #334155;
    --slate-800: #1e293b;
    --slate-900: #0f172a;
    --slate-950: #020617;
    
    --white: #ffffff;
    --black: #000000;
    
    --font-heading: 'Playfair Display', Georgia, serif;
    --font-body: 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;
    
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.08), 0 2px 4px rgba(0,0,0,0.04);
    --shadow-lg: 0 12px 40px rgba(0,0,0,0.12), 0 4px 12px rgba(0,0,0,0.06);
    --shadow-xl: 0 24px 60px rgba(0,0,0,0.15), 0 8px 20px rgba(0,0,0,0.08);
    
    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
}

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

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

a {
    color: var(--teal-600);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

ul {
    list-style: none;
}

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

/* Skip Link */
.skip-link {
    position: absolute;
    top: -100%;
    left: 16px;
    background: var(--teal-700);
    color: var(--white);
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    z-index: 10000;
    font-weight: 500;
}

.skip-link:focus {
    top: 16px;
    color: var(--white);
}

/* ========================================
   Header
   ======================================== */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--slate-200);
    transition: box-shadow var(--transition-base);
}

.site-header.scrolled {
    box-shadow: var(--shadow-md);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 76px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--slate-900);
}

.logo-mark {
    width: 36px;
    height: 36px;
    background: var(--teal-600);
    border-radius: 50%;
    position: relative;
    flex-shrink: 0;
}

.logo-mark::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 16px;
    height: 16px;
    border: 2px solid var(--white);
    border-radius: 50%;
    border-top-color: transparent;
    border-left-color: transparent;
    transform: translate(-50%, -50%) rotate(-45deg);
}

.logo-text {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: -0.01em;
}

.logo-accent {
    color: var(--teal-600);
    font-weight: 600;
}

.main-nav ul {
    display: flex;
    align-items: center;
    gap: 8px;
}

.main-nav a {
    color: var(--slate-700);
    font-size: 0.938rem;
    font-weight: 500;
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.main-nav a:hover {
    color: var(--teal-700);
    background: var(--teal-50);
}

/* Mobile Menu Button */
.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    width: 44px;
    height: 44px;
    position: relative;
    z-index: 1001;
}

.hamburger {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 22px;
    height: 2px;
    background: var(--slate-700);
    border-radius: 2px;
    transition: all var(--transition-base);
}

.hamburger::before,
.hamburger::after {
    content: '';
    position: absolute;
    width: 22px;
    height: 2px;
    background: var(--slate-700);
    border-radius: 2px;
    transition: all var(--transition-base);
}

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

.mobile-menu-btn[aria-expanded="true"] .hamburger {
    background: transparent;
}

.mobile-menu-btn[aria-expanded="true"] .hamburger::before {
    top: 0;
    transform: rotate(45deg);
}

.mobile-menu-btn[aria-expanded="true"] .hamburger::after {
    bottom: 0;
    transform: rotate(-45deg);
}

/* ========================================
   Buttons
   ======================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-family: var(--font-body);
    font-weight: 600;
    font-size: 0.938rem;
    padding: 12px 28px;
    border-radius: var(--radius-md);
    border: 2px solid transparent;
    cursor: pointer;
    transition: all var(--transition-base);
    text-decoration: none;
    white-space: nowrap;
}

.btn-primary {
    background: var(--teal-600);
    color: var(--white);
    border-color: var(--teal-600);
}

.btn-primary:hover {
    background: var(--teal-700);
    border-color: var(--teal-700);
    color: var(--white);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(13, 148, 136, 0.3);
}

.btn-outline-primary {
    background: transparent;
    color: var(--teal-600);
    border-color: var(--teal-600);
}

.btn-outline-primary:hover {
    background: var(--teal-600);
    color: var(--white);
    transform: translateY(-2px);
}

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

.btn-outline-light:hover {
    background: var(--white);
    color: var(--teal-700);
    border-color: var(--white);
    transform: translateY(-2px);
}

.btn-lg {
    padding: 16px 36px;
    font-size: 1rem;
    border-radius: var(--radius-lg);
}

.btn-sm {
    padding: 8px 20px;
    font-size: 0.875rem;
}

.btn-block {
    width: 100%;
}

/* ========================================
   Hero Section
   ======================================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    overflow: hidden;
    background: var(--slate-900);
}

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

.hero-bg img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0.45;
}

.hero-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(
        135deg,
        rgba(2, 6, 23, 0.85) 0%,
        rgba(15, 23, 42, 0.75) 50%,
        rgba(13, 148, 136, 0.4) 100%
    );
}

.hero-content {
    position: relative;
    z-index: 1;
    padding-top: 76px;
    padding-bottom: 80px;
    max-width: 720px;
}

.hero-badge {
    display: inline-block;
    background: rgba(13, 148, 136, 0.2);
    border: 1px solid rgba(13, 148, 136, 0.4);
    color: var(--teal-300);
    font-size: 0.813rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    padding: 8px 18px;
    border-radius: 50px;
    margin-bottom: 28px;
}

.hero-title {
    font-family: var(--font-heading);
    font-size: clamp(2.25rem, 5vw, 3.75rem);
    font-weight: 700;
    color: var(--white);
    line-height: 1.15;
    letter-spacing: -0.02em;
    margin-bottom: 24px;
}

.hero-subtitle {
    font-size: clamp(1.063rem, 2vw, 1.25rem);
    color: var(--slate-300);
    line-height: 1.75;
    margin-bottom: 40px;
    max-width: 600px;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    margin-bottom: 56px;
}

.hero-trust {
    display: flex;
    flex-wrap: wrap;
    gap: 32px;
}

.trust-item {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--slate-300);
    font-size: 0.938rem;
    font-weight: 500;
}

.trust-icon {
    width: 20px;
    height: 20px;
    color: var(--teal-400);
    flex-shrink: 0;
}

.hero-scroll {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: var(--slate-400);
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    z-index: 1;
}

.scroll-line {
    width: 1px;
    height: 48px;
    background: linear-gradient(to bottom, var(--teal-400), transparent);
    animation: scrollPulse 2s ease-in-out infinite;
}

@keyframes scrollPulse {
    0%, 100% { opacity: 1; transform: scaleY(1); }
    50% { opacity: 0.5; transform: scaleY(0.7); }
}

/* ========================================
   Section Shared
   ======================================== */
.section {
    padding: 100px 0;
}

.section-label {
    display: inline-block;
    font-size: 0.813rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--teal-600);
    margin-bottom: 16px;
}

.section-title {
    font-family: var(--font-heading);
    font-size: clamp(1.75rem, 3.5vw, 2.75rem);
    font-weight: 700;
    color: var(--slate-900);
    line-height: 1.2;
    letter-spacing: -0.02em;
    margin-bottom: 20px;
}

.section-body {
    font-size: 1.063rem;
    color: var(--slate-600);
    line-height: 1.8;
    margin-bottom: 16px;
}

.section-body-lg {
    font-size: 1.125rem;
    max-width: 640px;
    margin-left: auto;
    margin-right: auto;
}

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

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

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1.1fr;
    gap: 64px;
    align-items: center;
}

.about-image {
    position: relative;
}

.about-image img {
    width: 100%;
    height: 500px;
    object-fit: cover;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
}

.about-image-accent {
    position: absolute;
    bottom: -20px;
    right: -20px;
    width: 200px;
    height: 200px;
    background: var(--teal-100);
    border-radius: var(--radius-xl);
    z-index: -1;
}

.about-stats {
    display: flex;
    gap: 24px;
    margin-top: 40px;
    padding-top: 32px;
    border-top: 1px solid var(--slate-200);
}

.stat {
    flex: 1;
}

.stat-number {
    display: block;
    font-family: var(--font-heading);
    font-size: 2.25rem;
    font-weight: 700;
    color: var(--teal-600);
    line-height: 1;
    margin-bottom: 6px;
}

.stat-label {
    font-size: 0.813rem;
    color: var(--slate-500);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.stat-divider {
    width: 1px;
    background: var(--slate-200);
    align-self: stretch;
}

/* ========================================
   Services Section
   ======================================== */
.services {
    background: var(--slate-50);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-top: 56px;
}

.service-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 40px 32px;
    border: 1px solid var(--slate-200);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--teal-600);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition-base);
}

.service-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--teal-200);
}

.service-card:hover::before {
    transform: scaleX(1);
}

.service-icon {
    width: 56px;
    height: 56px;
    background: var(--teal-50);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
    color: var(--teal-600);
}

.service-icon svg {
    width: 28px;
    height: 28px;
}

.service-title {
    font-family: var(--font-heading);
    font-size: 1.313rem;
    font-weight: 700;
    color: var(--slate-900);
    margin-bottom: 12px;
    letter-spacing: -0.01em;
}

.service-desc {
    font-size: 0.938rem;
    color: var(--slate-600);
    line-height: 1.75;
}

/* ========================================
   Approach Section
   ======================================== */
.approach {
    background: var(--white);
}

.approach-grid {
    display: grid;
    grid-template-columns: 1.1fr 1fr;
    gap: 64px;
    align-items: center;
}

.approach-steps {
    margin-top: 48px;
    display: flex;
    flex-direction: column;
    gap: 32px;
}

.approach-step {
    display: flex;
    gap: 24px;
    align-items: flex-start;
}

.step-number {
    font-family: var(--font-heading);
    font-size: 2rem;
    font-weight: 700;
    color: var(--teal-200);
    line-height: 1;
    flex-shrink: 0;
    width: 48px;
}

.step-content h4 {
    font-size: 1.063rem;
    font-weight: 600;
    color: var(--slate-900);
    margin-bottom: 6px;
}

.step-content p {
    font-size: 0.938rem;
    color: var(--slate-600);
    line-height: 1.7;
}

.approach-visual img {
    width: 100%;
    height: 600px;
    object-fit: cover;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
}

/* ========================================
   CTA Section
   ======================================== */
.cta-section {
    background: linear-gradient(135deg, var(--slate-900) 0%, var(--teal-900) 100%);
    padding: 100px 0;
    position: relative;
    overflow: hidden;
}

.cta-section::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(13, 148, 136, 0.2) 0%, transparent 70%);
    border-radius: 50%;
}

.cta-content {
    position: relative;
    text-align: center;
    max-width: 700px;
    margin: 0 auto;
}

.cta-title {
    font-family: var(--font-heading);
    font-size: clamp(1.75rem, 3.5vw, 2.5rem);
    font-weight: 700;
    color: var(--white);
    line-height: 1.25;
    letter-spacing: -0.02em;
    margin-bottom: 20px;
}

.cta-text {
    font-size: 1.125rem;
    color: var(--slate-300);
    line-height: 1.8;
    margin-bottom: 40px;
}

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

/* ========================================
   Contact Section
   ======================================== */
.contact {
    background: var(--slate-50);
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
}

.contact-details {
    margin-top: 40px;
    display: flex;
    flex-direction: column;
    gap: 28px;
}

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

.contact-icon {
    width: 48px;
    height: 48px;
    background: var(--teal-50);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--teal-600);
    flex-shrink: 0;
}

.contact-icon svg {
    width: 22px;
    height: 22px;
}

.contact-item h4 {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--slate-900);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 4px;
}

.contact-item p,
.contact-item a {
    font-size: 0.938rem;
    color: var(--slate-600);
    line-height: 1.7;
}

.contact-item a:hover {
    color: var(--teal-600);
}

/* Contact Form */
.contact-form-wrapper {
    background: var(--white);
    border-radius: var(--radius-xl);
    padding: 48px;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--slate-200);
}

.form-title {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--slate-900);
    margin-bottom: 32px;
}

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

.form-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--slate-700);
    margin-bottom: 8px;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    font-family: var(--font-body);
    font-size: 0.938rem;
    color: var(--slate-800);
    background: var(--slate-50);
    border: 1.5px solid var(--slate-200);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    outline: none;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--teal-500);
    background: var(--white);
    box-shadow: 0 0 0 3px rgba(13, 148, 136, 0.1);
}

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

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

.form-note {
    font-size: 0.813rem;
    color: var(--slate-400);
    text-align: center;
    margin-top: 16px;
}

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

.success-icon {
    width: 64px;
    height: 64px;
    background: var(--teal-50);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    color: var(--teal-600);
}

.success-icon svg {
    width: 32px;
    height: 32px;
}

.form-success h3 {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    color: var(--slate-900);
    margin-bottom: 12px;
}

.form-success p {
    color: var(--slate-600);
    margin-bottom: 24px;
}

/* ========================================
   Footer
   ======================================== */
.site-footer {
    background: var(--slate-900);
    color: var(--slate-400);
    padding: 72px 0 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
    gap: 48px;
    padding-bottom: 56px;
    border-bottom: 1px solid var(--slate-800);
}

.footer-brand .logo {
    color: var(--white);
    margin-bottom: 16px;
}

.footer-tagline {
    font-size: 0.938rem;
    line-height: 1.75;
    color: var(--slate-400);
    max-width: 280px;
}

.footer-links h4,
.footer-contact h4 {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--white);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 20px;
}

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

.footer-links a {
    color: var(--slate-400);
    font-size: 0.938rem;
    transition: color var(--transition-fast);
}

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

.footer-contact p {
    font-size: 0.938rem;
    line-height: 1.75;
    margin-bottom: 8px;
}

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

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

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
    padding: 28px 0;
    font-size: 0.813rem;
    color: var(--slate-500);
}

.footer-legal {
    font-size: 0.75rem;
    color: var(--slate-600);
}

/* ========================================
   Responsive
   ======================================== */
@media (max-width: 1024px) {
    .about-grid,
    .approach-grid {
        gap: 48px;
    }
    
    .services-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 40px;
    }
}

@media (max-width: 768px) {
    .mobile-menu-btn {
        display: block;
    }
    
    .main-nav {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        max-width: 360px;
        height: 100vh;
        background: var(--white);
        box-shadow: var(--shadow-xl);
        padding: 100px 32px 40px;
        transition: right var(--transition-base);
        z-index: 999;
    }
    
    .main-nav.open {
        right: 0;
    }
    
    .main-nav ul {
        flex-direction: column;
        align-items: stretch;
        gap: 4px;
    }
    
    .main-nav a {
        padding: 14px 16px;
        font-size: 1.063rem;
    }
    
    .main-nav .btn {
        margin-top: 16px;
        text-align: center;
    }
    
    .mobile-overlay {
        position: fixed;
        inset: 0;
        background: rgba(0, 0, 0, 0.5);
        z-index: 998;
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-base);
    }
    
    .mobile-overlay.active {
        opacity: 1;
        visibility: visible;
    }
    
    .hero-content {
        padding-top: 100px;
    }
    
    .hero-actions {
        flex-direction: column;
    }
    
    .hero-actions .btn {
        width: 100%;
        text-align: center;
    }
    
    .hero-trust {
        gap: 20px;
    }
    
    .about-grid,
    .approach-grid,
    .contact-grid {
        grid-template-columns: 1fr;
    }
    
    .about-image {
        order: -1;
    }
    
    .about-image img {
        height: 350px;
    }
    
    .about-image-accent {
        display: none;
    }
    
    .approach-visual {
        order: -1;
    }
    
    .approach-visual img {
        height: 350px;
    }
    
    .services-grid {
        grid-template-columns: 1fr;
    }
    
    .contact-form-wrapper {
        padding: 32px 24px;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 36px;
    }
    
    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
    
    .section {
        padding: 72px 0;
    }
    
    .cta-section {
        padding: 72px 0;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 20px;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .about-stats {
        flex-direction: column;
        gap: 20px;
    }
    
    .stat-divider {
        display: none;
    }
    
    .cta-actions {
        flex-direction: column;
    }
    
    .cta-actions .btn {
        width: 100%;
    }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }
    
    html {
        scroll-behavior: auto;
    }
}