/* ============================================
   ACT — Anticipatory Care Tool
   Clean, professional healthcare design
   ============================================ */

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

:root {
    --navy: #1a2744;
    --navy-light: #263a5e;
    --navy-dark: #0f1a30;
    --teal: #2ab5a0;
    --teal-light: #3dd4bd;
    --teal-dark: #1f8f7f;
    --blue: #4a90d9;
    --blue-light: #6aade6;
    --accent: #e8734a;
    --accent-light: #f09070;
    --white: #ffffff;
    --gray-50: #f8fafb;
    --gray-100: #f0f3f5;
    --gray-200: #e2e7eb;
    --gray-300: #cdd4da;
    --gray-400: #9ba5b0;
    --gray-500: #6b7785;
    --gray-600: #4a5568;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;

    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-display: 'DM Serif Display', Georgia, serif;

    --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.1);
    --shadow-lg: 0 12px 32px rgba(0,0,0,0.12);
    --shadow-xl: 0 24px 48px rgba(0,0,0,0.16);

    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 32px;

    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

img { max-width: 100%; display: block; }
a { color: var(--teal-dark); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--teal); }

.container {
    max-width: 1140px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ---------- Navigation ---------- */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(0,0,0,0.06);
    transition: background var(--transition), box-shadow var(--transition);
}

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

.nav-inner {
    max-width: 1140px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 68px;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-circle {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--navy);
    color: var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.8125rem;
    letter-spacing: 0.05em;
}

.logo-circle-sm {
    width: 36px;
    height: 36px;
    font-size: 0.6875rem;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 28px;
    list-style: none;
}

.nav-links a {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--gray-600);
    transition: color var(--transition);
    position: relative;
}

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

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--teal);
    transition: width var(--transition);
}

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

.nav-cta {
    background: var(--teal) !important;
    color: var(--white) !important;
    padding: 8px 20px !important;
    border-radius: 100px;
    font-weight: 600 !important;
}

.nav-cta:hover { background: var(--teal-dark) !important; }
.nav-cta::after { display: none !important; }

.nav-cta-secondary {
    background: transparent !important;
    color: var(--navy) !important;
    padding: 8px 20px !important;
    border-radius: 100px;
    font-weight: 600 !important;
    border: 2px solid var(--navy);
}

.nav-cta-secondary:hover { background: var(--navy) !important; color: var(--white) !important; }
.nav-cta-secondary::after { display: none !important; }

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--gray-700);
    border-radius: 2px;
    transition: var(--transition);
}

/* ---------- Buttons ---------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 32px;
    font-size: 0.9375rem;
    font-weight: 600;
    font-family: var(--font-sans);
    border-radius: 100px;
    transition: all var(--transition);
    cursor: pointer;
    border: 2px solid transparent;
}

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

.btn-primary:hover {
    background: var(--teal-dark);
    border-color: var(--teal-dark);
    color: var(--white);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

.btn-outline:hover {
    background: rgba(255,255,255,0.1);
    border-color: var(--white);
    color: var(--white);
    transform: translateY(-2px);
}

.btn-full {
    width: 100%;
}

/* ---------- Hero ---------- */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: linear-gradient(145deg, var(--navy-dark) 0%, var(--navy) 50%, var(--navy-light) 100%);
    color: var(--white);
    overflow: hidden;
    padding-top: 68px;
}

.hero-bg {
    position: absolute;
    inset: 0;
    overflow: hidden;
    pointer-events: none;
}

.hero-circle {
    position: absolute;
    border-radius: 50%;
    opacity: 0.06;
}

.hero-circle-1 {
    width: 600px;
    height: 600px;
    background: var(--teal);
    top: -200px;
    right: -100px;
    animation: floatCircle 12s ease-in-out infinite;
}

.hero-circle-2 {
    width: 400px;
    height: 400px;
    background: var(--blue);
    bottom: -100px;
    left: -80px;
    animation: floatCircle 16s ease-in-out infinite reverse;
}

.hero-circle-3 {
    width: 250px;
    height: 250px;
    background: var(--accent);
    top: 40%;
    right: 20%;
    animation: floatCircle 10s ease-in-out infinite;
}

@keyframes floatCircle {
    0%, 100% { transform: translate(0, 0) scale(1); }
    50% { transform: translate(20px, -20px) scale(1.05); }
}

.hero-content {
    position: relative;
    z-index: 1;
    padding: 80px 0;
    max-width: 700px;
}

.hero-eyebrow {
    font-size: 0.8125rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.2em;
    color: var(--teal-light);
    margin-bottom: 20px;
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 400;
    line-height: 1.1;
    letter-spacing: -0.01em;
    margin-bottom: 24px;
}

.hero-subtitle {
    font-size: clamp(1rem, 2vw, 1.1875rem);
    line-height: 1.8;
    opacity: 0.85;
    margin-bottom: 40px;
}

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

/* ---------- Sections ---------- */
.section {
    padding: 100px 0;
}

.section-dark {
    background: var(--gray-900);
    color: var(--gray-100);
}

.section-alt {
    background: var(--gray-50);
}

.section-header {
    text-align: center;
    max-width: 680px;
    margin: 0 auto 60px;
}

.section-eyebrow {
    font-size: 0.8125rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--teal);
    margin-bottom: 12px;
}

.section-dark .section-eyebrow { color: var(--teal-light); }

.section-title {
    font-family: var(--font-display);
    font-size: clamp(1.75rem, 4vw, 2.75rem);
    font-weight: 400;
    line-height: 1.2;
    margin-bottom: 16px;
}

.section-subtitle {
    font-size: 1.0625rem;
    color: var(--gray-500);
    line-height: 1.7;
}

.section-dark .section-subtitle { color: var(--gray-400); }

/* ---------- Background ---------- */
.background-content {
    max-width: 760px;
    margin: 0 auto;
}

.background-content .lead {
    font-size: 1.1875rem;
    font-weight: 500;
    color: var(--gray-700);
    margin-bottom: 20px;
    line-height: 1.8;
}

.background-content p {
    font-size: 1rem;
    color: var(--gray-600);
    margin-bottom: 16px;
    line-height: 1.8;
}

/* ---------- Stats / Problem ---------- */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-bottom: 40px;
}

.stat-card {
    background: rgba(255,255,255,0.06);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: var(--radius-md);
    padding: 32px 24px;
    text-align: center;
    transition: transform var(--transition), border-color var(--transition);
}

.stat-card:hover {
    transform: translateY(-4px);
    border-color: rgba(255,255,255,0.2);
}

.stat-card-highlight {
    grid-column: span 2;
    background: rgba(42, 181, 160, 0.1);
    border-color: rgba(42, 181, 160, 0.2);
}

.stat-number {
    font-family: var(--font-display);
    font-size: 2.25rem;
    color: var(--teal-light);
    line-height: 1;
    margin-bottom: 10px;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--gray-400);
    line-height: 1.5;
}

.problem-detail {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 32px;
}

.detail-card {
    background: rgba(255,255,255,0.04);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: var(--radius-md);
    padding: 28px;
    text-align: center;
}

.detail-number {
    font-family: var(--font-display);
    font-size: 1.75rem;
    color: var(--accent-light);
    margin-bottom: 8px;
}

.detail-text {
    font-size: 0.875rem;
    color: var(--gray-400);
    line-height: 1.5;
}

.problem-note {
    text-align: center;
    font-size: 0.9375rem;
    color: var(--gray-400);
    max-width: 640px;
    margin: 0 auto 32px;
    line-height: 1.7;
}

.section-cta-link {
    text-align: center;
}

.link-arrow {
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--teal-light) !important;
    transition: transform var(--transition);
    display: inline-block;
}

.link-arrow:hover {
    transform: translateY(4px);
}

/* ---------- Features / What Is ACT ---------- */
.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.feature-card {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-md);
    padding: 32px 24px;
    text-align: center;
    transition: transform var(--transition), box-shadow var(--transition);
}

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

.feature-icon {
    width: 48px;
    height: 48px;
    margin: 0 auto 20px;
    color: var(--teal);
}

.feature-card h3 {
    font-size: 1.0625rem;
    font-weight: 700;
    color: var(--gray-800);
    margin-bottom: 8px;
}

.feature-card p {
    font-size: 0.875rem;
    color: var(--gray-500);
    line-height: 1.6;
}

/* ---------- Development ---------- */
.development-content {
    max-width: 800px;
    margin: 0 auto;
}

.development-text {
    margin-bottom: 32px;
}

.development-text p {
    font-size: 1rem;
    color: var(--gray-600);
    margin-bottom: 12px;
    line-height: 1.8;
    text-align: center;
}

.tools-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    justify-content: center;
    margin-bottom: 32px;
}

.tool-tag {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: 100px;
    padding: 10px 20px;
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--gray-700);
    transition: border-color var(--transition), box-shadow var(--transition);
}

.tool-tag:hover {
    border-color: var(--teal);
    box-shadow: var(--shadow-sm);
}

.development-note {
    font-size: 0.9375rem;
    color: var(--gray-500);
    text-align: center;
    line-height: 1.7;
}

/* ---------- Steps / How It Works ---------- */
.steps-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    margin-bottom: 80px;
}

.step-card {
    position: relative;
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-md);
    padding: 32px 24px;
    transition: transform var(--transition), box-shadow var(--transition);
}

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

.step-num {
    font-family: var(--font-display);
    font-size: 2.5rem;
    color: var(--teal);
    opacity: 0.2;
    line-height: 1;
    margin-bottom: 12px;
}

.step-card h3 {
    font-size: 1.0625rem;
    font-weight: 700;
    color: var(--gray-800);
    margin-bottom: 8px;
}

.step-card p {
    font-size: 0.875rem;
    color: var(--gray-500);
    line-height: 1.6;
}

/* ---------- Algorithm ---------- */
.algorithm-section {
    background: var(--gray-50);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    padding: 48px;
    margin-bottom: 40px;
    text-align: center;
}

.algorithm-title {
    font-family: var(--font-display);
    font-size: 1.5rem;
    color: var(--gray-800);
    margin-bottom: 20px;
}

.algorithm-content {
    max-width: 640px;
    margin: 0 auto;
}

.algorithm-content p {
    font-size: 0.9375rem;
    color: var(--gray-600);
    line-height: 1.8;
    margin-bottom: 12px;
}

/* ---------- Next Steps ---------- */
.next-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.next-card {
    background: rgba(255,255,255,0.05);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: var(--radius-lg);
    padding: 40px;
    transition: transform var(--transition), border-color var(--transition);
}

.next-card:hover {
    transform: translateY(-4px);
    border-color: rgba(255,255,255,0.2);
}

.next-icon {
    width: 48px;
    height: 48px;
    color: var(--teal-light);
    margin-bottom: 20px;
}

.next-card h3 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 8px;
}

.next-card p {
    font-size: 0.9375rem;
    color: var(--gray-400);
    line-height: 1.7;
}

/* ---------- Contact / CTA ---------- */
.section-cta {
    background: linear-gradient(145deg, var(--navy-dark), var(--navy));
    color: var(--white);
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: start;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.contact-card {
    background: rgba(255,255,255,0.06);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: var(--radius-md);
    padding: 28px;
}

.contact-card h4 {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.contact-card p {
    font-size: 0.875rem;
    color: rgba(255,255,255,0.7);
    margin-bottom: 8px;
}

.contact-card a {
    color: var(--teal-light);
    font-weight: 600;
    font-size: 0.9375rem;
}

.contact-card a:hover {
    color: var(--white);
}

.contact-form-wrapper {
    background: rgba(255,255,255,0.06);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: var(--radius-lg);
    padding: 36px;
}

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

.form-group label {
    display: block;
    font-size: 0.8125rem;
    font-weight: 600;
    color: rgba(255,255,255,0.8);
    margin-bottom: 6px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    font-size: 0.9375rem;
    font-family: var(--font-sans);
    background: rgba(255,255,255,0.08);
    border: 1px solid rgba(255,255,255,0.15);
    border-radius: var(--radius-sm);
    color: var(--white);
    transition: border-color var(--transition), background var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--teal);
    background: rgba(255,255,255,0.12);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: rgba(255,255,255,0.3);
}

/* ---------- Footer ---------- */
.footer {
    background: var(--gray-900);
    color: var(--gray-400);
    padding: 48px 0;
    border-top: 1px solid rgba(255,255,255,0.06);
}

.footer-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 40px;
    flex-wrap: wrap;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 12px;
}

.footer-brand p {
    font-size: 0.875rem;
    color: var(--gray-400);
}

.footer-links {
    display: flex;
    gap: 24px;
    flex-wrap: wrap;
}

.footer-links a {
    font-size: 0.8125rem;
    color: var(--gray-400);
}

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

.footer-legal {
    text-align: right;
}

.footer-legal p {
    font-size: 0.75rem;
    line-height: 1.6;
}

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
    .features-grid { grid-template-columns: repeat(2, 1fr); }
    .steps-grid { grid-template-columns: repeat(2, 1fr); }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .stat-card-highlight { grid-column: span 1; }
}

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

    .nav-links {
        display: none;
        position: absolute;
        top: 68px;
        left: 0;
        right: 0;
        background: var(--white);
        flex-direction: column;
        padding: 24px;
        gap: 16px;
        border-bottom: 1px solid var(--gray-200);
        box-shadow: var(--shadow-lg);
    }

    .nav-links.open { display: flex; }

    .stats-grid { grid-template-columns: 1fr 1fr; }
    .stat-card-highlight { grid-column: span 1; }
    .problem-detail { grid-template-columns: 1fr; }
    .features-grid { grid-template-columns: 1fr; }
    .steps-grid { grid-template-columns: 1fr; }
    .next-grid { grid-template-columns: 1fr; }
    .contact-grid { grid-template-columns: 1fr; }

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

    .footer-inner { flex-direction: column; text-align: center; }
    .footer-legal { text-align: center; }
    .footer-links { justify-content: center; }
}

@media (max-width: 480px) {
    .stats-grid { grid-template-columns: 1fr; }
    .section { padding: 64px 0; }
}

/* ---------- Scroll Animations ---------- */
.fade-up {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-up.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ---------- Active Nav Link ---------- */
.active-link {
    color: var(--navy) !important;
}