/* ============================================
   DSM Labs — Diagnostic Laboratory Website
   Charcoal + Coral | Confident Corporate
   ============================================ */

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

:root {
    --charcoal-900: #1A1A1A;
    --charcoal-800: #2C2C2C;
    --charcoal-700: #3A3A3A;
    --charcoal-600: #4A4A4A;
    --charcoal-500: #6B6B6B;
    --charcoal-100: #F0EFED;
    --charcoal-50: #F8F7F5;

    --coral-600: #D45547;
    --coral-500: #E86A5B;
    --coral-400: #F08578;
    --coral-300: #F5A99E;
    --coral-100: #FDEAE7;
    --coral-50: #FEF3F1;

    --white: #FFFFFF;
    --black: #0A0A0A;

    --font-heading: 'Playfair Display', Georgia, serif;
    --font-body: 'Inter', system-ui, sans-serif;

    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;

    --shadow-sm: 0 1px 3px rgba(26,26,26,0.08);
    --shadow-md: 0 4px 16px rgba(26,26,26,0.10);
    --shadow-lg: 0 8px 32px rgba(26,26,26,0.12);
    --shadow-xl: 0 16px 48px rgba(26,26,26,0.14);

    --transition: 200ms cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: var(--font-body);
    font-size: 16px;
    line-height: 1.65;
    color: var(--charcoal-800);
    background: var(--white);
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}

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

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

ul, ol, address {
    list-style: none;
}

h1, h2, h3, h4 {
    font-family: var(--font-heading);
    line-height: 1.2;
    color: var(--charcoal-900);
}

/* --- Skip Link --- */
.skip-link {
    position: absolute;
    top: -100%;
    left: 1rem;
    background: var(--coral-500);
    color: var(--white);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    z-index: 1000;
    font-weight: 600;
}
.skip-link:focus {
    top: 1rem;
}

/* --- Container --- */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* --- Header --- */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(255,255,255,0.97);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(44,44,44,0.08);
    transition: box-shadow var(--transition);
}

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

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

/* --- Logo --- */
.logo {
    display: flex;
    align-items: center;
    gap: 0.6rem;
}

.logo-text {
    font-family: var(--font-heading);
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--charcoal-900);
    letter-spacing: -0.02em;
}

.logo-accent {
    color: var(--coral-500);
}

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

/* --- Navigation --- */
.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.25rem;
    z-index: 110;
}

.nav-toggle-bar {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--charcoal-800);
    border-radius: 2px;
    transition: transform var(--transition), opacity var(--transition);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) {
    opacity: 0;
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    list-style: none;
}

.nav-menu a {
    display: block;
    padding: 0.5rem 0.875rem;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--charcoal-700);
    border-radius: var(--radius-sm);
    transition: color var(--transition), background var(--transition);
}

.nav-menu a:hover {
    color: var(--charcoal-900);
    background: var(--charcoal-50);
}

.nav-cta {
    background: var(--coral-500) !important;
    color: var(--white) !important;
    font-weight: 600 !important;
    margin-left: 0.5rem;
}

.nav-cta:hover {
    background: var(--coral-600) !important;
}

/* --- Hero --- */
.hero {
    padding-top: 72px;
    background: var(--white);
    overflow: hidden;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
    padding: 4rem 0 5rem;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--coral-600);
    background: var(--coral-50);
    padding: 0.4rem 0.875rem;
    border-radius: 50px;
    margin-bottom: 1.5rem;
}

.badge-dot {
    width: 6px;
    height: 6px;
    background: var(--coral-500);
    border-radius: 50%;
    display: inline-block;
}

.hero-title {
    font-size: clamp(2rem, 4vw, 3.125rem);
    font-weight: 700;
    line-height: 1.12;
    color: var(--charcoal-900);
    margin-bottom: 1.25rem;
    letter-spacing: -0.025em;
}

.hero-desc {
    font-size: 1.1rem;
    line-height: 1.7;
    color: var(--charcoal-600);
    margin-bottom: 2rem;
    max-width: 520px;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-bottom: 3rem;
}

.hero-stats {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

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

.stat-number {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--charcoal-900);
    line-height: 1;
}

.stat-label {
    font-size: 0.78rem;
    color: var(--charcoal-500);
    margin-top: 0.25rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.stat-divider {
    width: 1px;
    height: 36px;
    background: var(--charcoal-100);
}

/* Hero Image */
.hero-image {
    position: relative;
}

.hero-image-frame {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-xl);
}

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

.hero-image-accent {
    position: absolute;
    bottom: -20px;
    right: -20px;
    width: 120px;
    height: 120px;
    background: var(--coral-100);
    border-radius: var(--radius-lg);
    z-index: -1;
}

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-family: var(--font-body);
    font-size: 0.9375rem;
    font-weight: 600;
    padding: 0.8125rem 1.75rem;
    border-radius: var(--radius-sm);
    border: 2px solid transparent;
    cursor: pointer;
    transition: background var(--transition), color var(--transition), border-color var(--transition), box-shadow var(--transition);
    text-align: center;
    white-space: nowrap;
}

.btn-primary {
    background: var(--coral-500);
    color: var(--white);
    border-color: var(--coral-500);
}
.btn-primary:hover {
    background: var(--coral-600);
    border-color: var(--coral-600);
    box-shadow: 0 4px 16px rgba(232,106,91,0.35);
}

.btn-ghost {
    background: transparent;
    color: var(--charcoal-800);
    border-color: var(--charcoal-100);
}
.btn-ghost:hover {
    border-color: var(--charcoal-500);
    color: var(--charcoal-900);
}

.btn-outline {
    background: transparent;
    color: var(--white);
    border-color: rgba(255,255,255,0.4);
}
.btn-outline:hover {
    background: var(--white);
    color: var(--charcoal-900);
    border-color: var(--white);
}

.btn-lg {
    padding: 1rem 2rem;
    font-size: 1rem;
}

.btn-full {
    width: 100%;
}

/* --- Section Tags & Titles --- */
.section-tag {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--coral-500);
    margin-bottom: 0.75rem;
}

.section-title {
    font-size: clamp(1.75rem, 3vw, 2.5rem);
    font-weight: 700;
    line-height: 1.15;
    letter-spacing: -0.02em;
    color: var(--charcoal-900);
    margin-bottom: 1rem;
}

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

.section-header {
    margin-bottom: 3.5rem;
}

.section-header--centered {
    text-align: center;
}

.section-header--centered .section-desc {
    max-width: 600px;
    margin: 0 auto;
}

.section-desc {
    font-size: 1.0625rem;
    line-height: 1.7;
    color: var(--charcoal-600);
    max-width: 580px;
}

/* --- Services --- */
.services {
    padding: 5.5rem 0;
    background: var(--charcoal-50);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

.service-card {
    background: var(--white);
    border-radius: var(--radius-md);
    padding: 2rem;
    border: 1px solid rgba(44,44,44,0.06);
    transition: box-shadow var(--transition), transform var(--transition);
}

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

.service-icon {
    width: 52px;
    height: 52px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--coral-50);
    border-radius: var(--radius-sm);
    color: var(--coral-500);
    margin-bottom: 1.25rem;
}

.service-title {
    font-family: var(--font-body);
    font-size: 1.0625rem;
    font-weight: 700;
    color: var(--charcoal-900);
    margin-bottom: 0.625rem;
}

.service-desc {
    font-size: 0.9rem;
    line-height: 1.65;
    color: var(--charcoal-600);
}

/* --- About --- */
.about {
    padding: 5.5rem 0;
    background: var(--white);
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.about-image-group {
    position: relative;
}

.about-image-main {
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.about-image-main img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.about-image-secondary {
    position: absolute;
    bottom: -2rem;
    right: -1.5rem;
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-xl);
    border: 4px solid var(--white);
}

.about-image-secondary img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.about-content .section-tag {
    margin-bottom: 0.75rem;
}

.about-text {
    font-size: 1rem;
    line-height: 1.75;
    color: var(--charcoal-600);
    margin-bottom: 1rem;
}

.about-features {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem 1.5rem;
    margin-top: 2rem;
}

.about-feature {
    display: flex;
    align-items: center;
    gap: 0.625rem;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--charcoal-800);
}

.about-check {
    color: var(--coral-500);
    flex-shrink: 0;
}

/* --- Why DSM --- */
.why-dsm {
    padding: 5.5rem 0;
    background: var(--charcoal-900);
}

.why-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
}

.why-item {
    padding: 2rem;
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: var(--radius-md);
    transition: border-color var(--transition), background var(--transition);
}

.why-item:hover {
    border-color: rgba(232,106,91,0.4);
    background: rgba(255,255,255,0.03);
}

.why-number {
    font-family: var(--font-heading);
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--coral-500);
    line-height: 1;
    margin-bottom: 0.75rem;
    display: block;
}

.why-title {
    font-family: var(--font-body);
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 0.625rem;
}

.why-desc {
    font-size: 0.9rem;
    line-height: 1.7;
    color: rgba(255,255,255,0.6);
}

/* --- CTA Banner --- */
.cta-banner {
    padding: 5rem 0;
    background: var(--coral-500);
}

.cta-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 2rem;
    flex-wrap: wrap;
}

.cta-title {
    font-size: clamp(1.5rem, 3vw, 2.125rem);
    font-weight: 700;
    color: var(--white);
    margin-bottom: 0.5rem;
    letter-spacing: -0.02em;
}

.cta-desc {
    font-size: 1rem;
    color: rgba(255,255,255,0.85);
    max-width: 480px;
}

.cta-actions {
    display: flex;
    gap: 0.75rem;
    flex-shrink: 0;
}

/* --- Contact --- */
.contact {
    padding: 5.5rem 0;
    background: var(--charcoal-800);
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
}

.contact-desc {
    color: rgba(255,255,255,0.65);
    margin-bottom: 2rem;
    max-width: 440px;
}

.contact-details {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.contact-detail {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
}

.contact-icon {
    color: var(--coral-400);
    flex-shrink: 0;
    margin-top: 2px;
}

.contact-detail strong {
    display: block;
    font-family: var(--font-body);
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--coral-400);
    margin-bottom: 0.25rem;
}

.contact-detail span,
.contact-detail a {
    font-size: 0.9375rem;
    color: rgba(255,255,255,0.8);
    line-height: 1.6;
}

.contact-detail a:hover {
    color: var(--white);
    text-decoration: underline;
}

/* --- Contact Form --- */
.contact-form-wrapper {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 2.5rem;
}

.form-title {
    font-size: 1.375rem;
    font-weight: 700;
    color: var(--charcoal-900);
    margin-bottom: 1.5rem;
}

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

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.375rem;
    margin-bottom: 1rem;
}

.form-group label {
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--charcoal-700);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.form-group input,
.form-group textarea {
    font-family: var(--font-body);
    font-size: 0.9375rem;
    padding: 0.75rem 1rem;
    border: 1.5px solid var(--charcoal-100);
    border-radius: var(--radius-sm);
    background: var(--charcoal-50);
    color: var(--charcoal-900);
    transition: border-color var(--transition), box-shadow var(--transition);
    outline: none;
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--coral-500);
    box-shadow: 0 0 0 3px rgba(232,106,91,0.12);
    background: var(--white);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--charcoal-500);
}

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

.form-success {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-top: 1rem;
    padding: 0.875rem 1rem;
    background: #E8F5E9;
    color: #2E7D32;
    font-size: 0.875rem;
    font-weight: 500;
    border-radius: var(--radius-sm);
}

.form-success svg {
    flex-shrink: 0;
}

/* --- Footer --- */
.footer {
    background: var(--charcoal-900);
    padding: 4rem 0 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: 2.5rem;
    padding-bottom: 3rem;
    border-bottom: 1px solid rgba(255,255,255,0.08);
}

.footer-tagline {
    font-size: 0.875rem;
    color: rgba(255,255,255,0.5);
    line-height: 1.7;
    margin-top: 1rem;
    max-width: 280px;
}

.footer-heading {
    font-family: var(--font-body);
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--white);
    margin-bottom: 1rem;
}

.footer-links ul {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.footer-links a {
    font-size: 0.875rem;
    color: rgba(255,255,255,0.5);
    transition: color var(--transition);
}

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

.footer-contact address {
    font-style: normal;
}

.footer-contact p {
    font-size: 0.875rem;
    color: rgba(255,255,255,0.5);
    line-height: 1.7;
}

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

.footer-bottom {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 0.75rem;
    padding: 1.5rem 0;
}

.footer-bottom p {
    font-size: 0.8125rem;
    color: rgba(255,255,255,0.35);
}

.footer-note {
    font-size: 0.75rem !important;
    max-width: 480px;
    text-align: right;
}

/* --- Scroll Reveal (progressive enhancement) --- */
.reveal {
    opacity: 1;
    transform: none;
    transition: opacity 600ms ease, transform 600ms ease;
}

@media (prefers-reduced-motion: no-preference) {
    .reveal {
        opacity: 0;
        transform: translateY(24px);
    }
    .reveal.visible {
        opacity: 1;
        transform: none;
    }
}

/* --- Responsive --- */
@media (max-width: 1024px) {
    .hero-grid {
        gap: 2rem;
        padding: 3rem 0 4rem;
    }
    
    .about-grid {
        gap: 2.5rem;
    }
    
    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 2rem;
    }
}

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

    .nav-menu {
        position: fixed;
        top: 72px;
        left: 0;
        right: 0;
        background: var(--white);
        flex-direction: column;
        align-items: stretch;
        padding: 1rem;
        border-bottom: 1px solid rgba(44,44,44,0.08);
        box-shadow: var(--shadow-md);
        transform: translateY(-110%);
        opacity: 0;
        visibility: hidden;
        transition: transform 300ms ease, opacity 300ms ease, visibility 300ms;
    }

    .nav-menu.open {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .nav-menu a {
        padding: 0.875rem 1rem;
    }

    .nav-cta {
        text-align: center;
        margin-left: 0;
        margin-top: 0.5rem;
    }

    .hero-grid {
        grid-template-columns: 1fr;
        padding: 2.5rem 0 3.5rem;
    }

    .hero-image {
        order: -1;
    }

    .hero-image-frame {
        border-radius: var(--radius-md);
    }

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

    .hero-stats {
        gap: 1rem;
    }

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

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

    .about-image-secondary {
        right: 0;
        bottom: -1.5rem;
    }

    .about-features {
        grid-template-columns: 1fr;
    }

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

    .cta-inner {
        flex-direction: column;
        text-align: center;
    }

    .cta-actions {
        flex-direction: column;
        width: 100%;
    }

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

    .contact-grid {
        grid-template-columns: 1fr;
        gap: 2.5rem;
    }

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

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

    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }

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

@media (max-width: 480px) {
    .container {
        padding: 0 1.125rem;
    }

    .hero-title {
        font-size: 1.75rem;
    }

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

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

    .contact-form-wrapper {
        padding: 1.5rem;
    }
}