/* ============================================================
   Layer IV Medical — Stylesheet
   ============================================================ */

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

:root {
    --color-primary: #0f766e;
    --color-primary-light: #14b8a6;
    --color-primary-dark: #0d5f59;
    --color-primary-50: #f0fdfa;
    --color-primary-100: #ccfbf1;
    --color-accent: #0ea5e9;
    --color-dark: #0f172a;
    --color-text: #334155;
    --color-text-light: #64748b;
    --color-border: #e2e8f0;
    --color-bg: #ffffff;
    --color-bg-alt: #f8fafc;
    --color-bg-dark: #0f172a;
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
    --shadow-lg: 0 12px 32px rgba(0,0,0,0.1);
    --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --transition: 0.2s ease;
}

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

body {
    font-family: var(--font);
    color: var(--color-text);
    background: var(--color-bg);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }

/* ---------- Container ---------- */
.container {
    max-width: 1120px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ---------- Buttons ---------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-family: var(--font);
    font-weight: 500;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition);
    text-decoration: none;
    white-space: nowrap;
}

.btn-sm { padding: 8px 18px; font-size: 0.875rem; }
.btn-lg { padding: 14px 28px; font-size: 1rem; }
.btn-full { width: 100%; }

.btn-primary {
    background: var(--color-primary);
    color: #fff;
}
.btn-primary:hover {
    background: var(--color-primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-outline {
    background: transparent;
    color: var(--color-primary);
    border: 1.5px solid var(--color-primary);
}
.btn-outline:hover {
    background: var(--color-primary-50);
}

/* ---------- Header ---------- */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255,255,255,0.92);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
    transition: box-shadow var(--transition);
}

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

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

/* ---------- Logo ---------- */
.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
}

.logo-icon {
    width: 36px;
    height: 36px;
    color: var(--color-primary);
}

.logo-text {
    display: flex;
    flex-direction: column;
    line-height: 1.15;
}

.logo-name {
    font-weight: 700;
    font-size: 1.05rem;
    color: var(--color-dark);
    letter-spacing: -0.02em;
}

.logo-division {
    font-weight: 400;
    font-size: 0.75rem;
    color: var(--color-primary);
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

/* ---------- Navigation ---------- */
.nav {
    display: flex;
    align-items: center;
    gap: 28px;
}

.nav-link {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-text);
    transition: color var(--transition);
}

.nav-link:hover {
    color: var(--color-primary);
}

/* Mobile menu button */
.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}
.mobile-menu-btn span {
    width: 22px;
    height: 2px;
    background: var(--color-dark);
    border-radius: 2px;
    transition: all 0.3s ease;
}
.mobile-menu-btn.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}
.mobile-menu-btn.active span:nth-child(2) {
    opacity: 0;
}
.mobile-menu-btn.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* Mobile Nav */
.mobile-nav {
    display: none;
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    padding: 16px 24px;
    z-index: 999;
    flex-direction: column;
    gap: 12px;
    box-shadow: var(--shadow-md);
}
.mobile-nav.open {
    display: flex;
}
.mobile-nav-link {
    font-size: 1rem;
    font-weight: 500;
    padding: 10px 0;
    color: var(--color-text);
    border-bottom: 1px solid var(--color-border);
}
.mobile-nav-link:last-child { border-bottom: none; }
.mobile-nav-link:hover { color: var(--color-primary); }

/* ---------- Hero ---------- */
.hero {
    position: relative;
    padding: 160px 0 100px;
    overflow: hidden;
    background: linear-gradient(160deg, var(--color-primary-50) 0%, var(--color-bg) 60%);
}

.hero-content {
    max-width: 680px;
    position: relative;
    z-index: 1;
}

.hero-tag {
    display: inline-block;
    background: var(--color-primary-100);
    color: var(--color-primary);
    padding: 6px 14px;
    border-radius: 100px;
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    margin-bottom: 20px;
}

.hero-title {
    font-size: clamp(2.2rem, 5vw, 3.4rem);
    font-weight: 700;
    color: var(--color-dark);
    line-height: 1.15;
    letter-spacing: -0.025em;
    margin-bottom: 20px;
}

.text-accent {
    color: var(--color-primary);
}

.hero-description {
    font-size: 1.125rem;
    color: var(--color-text-light);
    line-height: 1.7;
    margin-bottom: 32px;
}

.hero-actions {
    display: flex;
    gap: 14px;
    flex-wrap: wrap;
}

.hero-bg-pattern {
    position: absolute;
    top: -40%;
    right: -10%;
    width: 700px;
    height: 700px;
    border-radius: 50%;
    background: radial-gradient(circle, var(--color-primary-100) 0%, transparent 70%);
    opacity: 0.5;
    z-index: 0;
    pointer-events: none;
}

/* ---------- Sections ---------- */
.section {
    padding: 96px 0;
}

.section-header {
    max-width: 620px;
    margin-bottom: 56px;
}

.section-tag {
    display: inline-block;
    background: var(--color-primary-100);
    color: var(--color-primary);
    padding: 5px 12px;
    border-radius: 100px;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    margin-bottom: 14px;
}

.section-title {
    font-size: clamp(1.6rem, 3.5vw, 2.25rem);
    font-weight: 700;
    color: var(--color-dark);
    line-height: 1.2;
    letter-spacing: -0.02em;
    margin-bottom: 14px;
}

.section-description {
    font-size: 1.05rem;
    color: var(--color-text-light);
    line-height: 1.7;
}

/* ---------- About ---------- */
.section-about {
    background: var(--color-bg);
}

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

.about-card {
    background: var(--color-bg-alt);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 32px 28px;
    transition: all var(--transition);
}

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

.about-card-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-primary-100);
    border-radius: var(--radius-md);
    margin-bottom: 20px;
    color: var(--color-primary);
}

.about-card-icon svg {
    width: 24px;
    height: 24px;
}

.about-card h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-dark);
    margin-bottom: 10px;
}

.about-card p {
    font-size: 0.925rem;
    color: var(--color-text-light);
    line-height: 1.65;
}

/* ---------- Services ---------- */
.section-services {
    background: var(--color-bg-alt);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.service-item {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 32px 28px;
    transition: all var(--transition);
}

.service-item:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
    border-color: transparent;
}

.service-number {
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 12px;
    letter-spacing: 0.04em;
}

.service-item h3 {
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--color-dark);
    margin-bottom: 8px;
}

.service-item p {
    font-size: 0.925rem;
    color: var(--color-text-light);
    line-height: 1.65;
}

/* ---------- Enquiry ---------- */
.section-enquiry {
    background: var(--color-bg);
}

.enquiry-layout {
    display: grid;
    grid-template-columns: 1fr 1.1fr;
    gap: 64px;
    align-items: start;
}

.enquiry-info .section-tag { margin-bottom: 14px; }
.enquiry-info .section-title { margin-bottom: 14px; }
.enquiry-info .section-description { margin-bottom: 32px; }

.contact-details {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 0.95rem;
    color: var(--color-text);
}

.contact-item svg {
    width: 20px;
    height: 20px;
    color: var(--color-primary);
    flex-shrink: 0;
}

.contact-item a {
    color: var(--color-primary);
    font-weight: 500;
    transition: color var(--transition);
}

.contact-item a:hover {
    color: var(--color-primary-dark);
}

/* ---------- Form ---------- */
.enquiry-form-wrapper {
    background: var(--color-bg-alt);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: 36px;
}

.enquiry-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.form-group label {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--color-dark);
}

.required {
    color: #ef4444;
}

.form-group input,
.form-group select,
.form-group textarea {
    font-family: var(--font);
    font-size: 0.925rem;
    padding: 12px 14px;
    border: 1.5px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-bg);
    color: var(--color-dark);
    transition: all var(--transition);
    outline: none;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--color-text-light);
    opacity: 0.7;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(15, 118, 110, 0.1);
}

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

.form-group select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%2364748b' d='M6 8.825a.5.5 0 01-.354-.146l-4-4a.5.5 0 01.708-.708L6 7.617l3.646-3.646a.5.5 0 01.708.708l-4 4A.5.5 0 016 8.825z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 14px center;
    padding-right: 36px;
}

/* Submit button states */
.btn .btn-loading {
    display: none;
    align-items: center;
    gap: 8px;
}
.btn.loading .btn-text { display: none; }
.btn.loading .btn-loading { display: flex; }

.spinner {
    width: 18px;
    height: 18px;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ---------- Footer ---------- */
.footer {
    background: var(--color-bg-dark);
    color: #94a3b8;
    padding: 56px 0 0;
}

.footer-inner {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 48px;
    padding-bottom: 40px;
    border-bottom: 1px solid rgba(255,255,255,0.08);
}

.footer-brand .logo-icon { color: var(--color-primary-light); }
.footer-brand .logo-name { color: #fff; }
.footer-brand .logo-division { color: var(--color-primary-light); }

.footer-tagline {
    margin-top: 14px;
    font-size: 0.9rem;
    line-height: 1.6;
}

.footer-links h4,
.footer-contact h4 {
    font-size: 0.85rem;
    font-weight: 600;
    color: #fff;
    margin-bottom: 16px;
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.footer-links a,
.footer-contact a {
    display: block;
    font-size: 0.9rem;
    margin-bottom: 10px;
    transition: color var(--transition);
}

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

.footer-bottom {
    padding: 24px 0;
    text-align: center;
    font-size: 0.8rem;
}

.footer-bottom strong {
    color: #cbd5e1;
    font-weight: 600;
}

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
    .about-grid {
        grid-template-columns: 1fr;
    }
    .services-grid {
        grid-template-columns: 1fr;
    }
    .enquiry-layout {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    .footer-inner {
        grid-template-columns: 1fr;
        gap: 32px;
    }
}

@media (max-width: 640px) {
    .nav { display: none; }
    .mobile-menu-btn { display: flex; }

    .hero {
        padding: 130px 0 72px;
    }
    .hero-title {
        font-size: 2rem;
    }
    .section {
        padding: 64px 0;
    }
    .enquiry-form-wrapper {
        padding: 24px;
    }
    .hero-bg-pattern {
        width: 400px;
        height: 400px;
        right: -30%;
        top: -20%;
    }
}

/* ---------- Animation helpers ---------- */
.fade-up {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-up.visible {
    opacity: 1;
    transform: translateY(0);
}