/* ============================================================
   AppointmentChat.com — Global Styles
   ============================================================ */

:root {
    --ac-primary: #2563eb;
    --ac-primary-dark: #1d4ed8;
    --ac-primary-light: #dbeafe;
    --ac-accent: #f59e0b;
    --ac-accent-dark: #d97706;
    --ac-dark: #0f172a;
    --ac-gray-900: #1e293b;
    --ac-gray-700: #334155;
    --ac-gray-500: #64748b;
    --ac-gray-300: #cbd5e1;
    --ac-gray-100: #f1f5f9;
    --ac-white: #ffffff;
    --ac-border: #e2e8f0;
    --ac-green: #10b981;
    --ac-red: #ef4444;
    --ac-radius: 12px;
    --ac-radius-sm: 8px;
    --ac-shadow: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
    --ac-shadow-lg: 0 10px 40px rgba(0,0,0,0.12);
    --ac-transition: 0.2s ease;
    --ac-max-width: 1200px;
}

*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

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

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    color: var(--ac-gray-900);
    line-height: 1.6;
    background: var(--ac-white);
    -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }
a { color: var(--ac-primary); text-decoration: none; }
a:hover { color: var(--ac-primary-dark); }

/* ---- Container ---- */
.ac-container {
    max-width: var(--ac-max-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* ---- Typography ---- */
h1, h2, h3, h4 {
    font-weight: 800;
    line-height: 1.15;
    color: var(--ac-dark);
}

h1 { font-size: clamp(2.25rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.75rem, 3.5vw, 2.5rem); }
h3 { font-size: 1.25rem; }

/* ---- Buttons ---- */
.ac-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-weight: 700;
    font-size: 1rem;
    border: none;
    border-radius: var(--ac-radius);
    cursor: pointer;
    transition: all var(--ac-transition);
    text-decoration: none;
    line-height: 1;
}

.ac-btn--primary {
    background: var(--ac-primary);
    color: var(--ac-white);
    padding: 16px 32px;
}
.ac-btn--primary:hover {
    background: var(--ac-primary-dark);
    color: var(--ac-white);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.35);
}

.ac-btn--accent {
    background: var(--ac-accent);
    color: var(--ac-dark);
    padding: 16px 32px;
}
.ac-btn--accent:hover {
    background: var(--ac-accent-dark);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(245, 158, 11, 0.35);
}

.ac-btn--outline {
    background: transparent;
    color: var(--ac-primary);
    border: 2px solid var(--ac-primary);
    padding: 14px 30px;
}
.ac-btn--outline:hover {
    background: var(--ac-primary);
    color: var(--ac-white);
}

.ac-btn--lg {
    font-size: 1.125rem;
    padding: 18px 40px;
}

.ac-btn--sm {
    font-size: 0.875rem;
    padding: 10px 20px;
}

/* ============================================================
   Navigation
   ============================================================ */

.ac-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--ac-border);
    transition: box-shadow var(--ac-transition);
}

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

.ac-nav__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: var(--ac-max-width);
    margin: 0 auto;
    padding: 0 24px;
    height: 72px;
}

.ac-nav__logo {
    font-size: 1.25rem;
    font-weight: 800;
    color: var(--ac-dark);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 8px;
}

.ac-nav__logo-icon {
    width: 32px;
    height: 32px;
    background: var(--ac-primary);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.ac-nav__logo-icon svg {
    width: 18px;
    height: 18px;
    stroke: var(--ac-white);
    fill: none;
}

.ac-nav__links {
    display: flex;
    align-items: center;
    gap: 32px;
}

.ac-nav__link {
    font-weight: 600;
    font-size: 0.9375rem;
    color: var(--ac-gray-700);
    text-decoration: none;
    transition: color var(--ac-transition);
}

.ac-nav__link:hover { color: var(--ac-primary); }

.ac-hamburger {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.ac-hamburger span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--ac-dark);
    margin: 5px 0;
    transition: all 0.3s;
}

.ac-mobile-nav {
    display: none;
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--ac-white);
    z-index: 99;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 24px;
}

.ac-mobile-nav.open { display: flex; }

.ac-mobile-nav a {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--ac-dark);
}

/* ============================================================
   Hero
   ============================================================ */

.ac-hero {
    padding: 140px 24px 80px;
    background: linear-gradient(135deg, #f0f7ff 0%, #e8f4fd 50%, #f5f0ff 100%);
    text-align: center;
    overflow: hidden;
    position: relative;
}

.ac-hero::before {
    content: '';
    position: absolute;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(37,99,235,0.06) 0%, transparent 70%);
    top: -200px;
    right: -200px;
    border-radius: 50%;
}

.ac-hero__inner {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
}

.ac-hero__badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: var(--ac-primary-light);
    color: var(--ac-primary-dark);
    font-weight: 700;
    font-size: 0.8125rem;
    padding: 6px 14px;
    border-radius: 100px;
    margin-bottom: 24px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.ac-hero__badge-dot {
    width: 8px;
    height: 8px;
    background: var(--ac-green);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.ac-hero h1 { margin-bottom: 20px; }

.ac-hero__sub {
    font-size: clamp(1.0625rem, 2vw, 1.25rem);
    color: var(--ac-gray-500);
    max-width: 600px;
    margin: 0 auto 40px;
    line-height: 1.7;
}

.ac-hero__ctas {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 48px;
}

.ac-hero__proof {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 32px;
    flex-wrap: wrap;
    color: var(--ac-gray-500);
    font-size: 0.875rem;
}

.ac-hero__proof-item {
    display: flex;
    align-items: center;
    gap: 6px;
}

.ac-hero__proof-item svg {
    width: 16px;
    height: 16px;
    stroke: var(--ac-green);
    fill: none;
}

/* ============================================================
   Section Layout
   ============================================================ */

.ac-section {
    padding: 80px 24px;
}

.ac-section--gray {
    background: var(--ac-gray-100);
}

.ac-section--dark {
    background: var(--ac-dark);
    color: var(--ac-white);
}

.ac-section--dark h2,
.ac-section--dark h3 {
    color: var(--ac-white);
}

.ac-section-header {
    text-align: center;
    max-width: 640px;
    margin: 0 auto 56px;
}

.ac-section-header p {
    color: var(--ac-gray-500);
    font-size: 1.0625rem;
    margin-top: 12px;
}

.ac-section--dark .ac-section-header p {
    color: var(--ac-gray-300);
}

/* ============================================================
   How It Works (3 Steps)
   ============================================================ */

.ac-steps {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
    max-width: var(--ac-max-width);
    margin: 0 auto;
}

.ac-step {
    text-align: center;
    padding: 32px 24px;
}

.ac-step__number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 56px;
    height: 56px;
    background: var(--ac-primary-light);
    color: var(--ac-primary);
    font-size: 1.5rem;
    font-weight: 800;
    border-radius: 16px;
    margin-bottom: 20px;
}

.ac-step h3 { margin-bottom: 12px; }

.ac-step p {
    color: var(--ac-gray-500);
    font-size: 0.9375rem;
    line-height: 1.7;
}

/* ============================================================
   Features Grid
   ============================================================ */

.ac-features {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
    max-width: var(--ac-max-width);
    margin: 0 auto;
}

.ac-feature {
    background: var(--ac-white);
    border: 1px solid var(--ac-border);
    border-radius: var(--ac-radius);
    padding: 32px;
    transition: box-shadow var(--ac-transition);
}

.ac-feature:hover { box-shadow: var(--ac-shadow-lg); }

.ac-feature__icon {
    width: 48px;
    height: 48px;
    background: var(--ac-primary-light);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 16px;
}

.ac-feature__icon svg {
    width: 24px;
    height: 24px;
    stroke: var(--ac-primary);
    fill: none;
}

.ac-feature h3 { margin-bottom: 8px; }

.ac-feature p {
    color: var(--ac-gray-500);
    font-size: 0.9375rem;
    line-height: 1.7;
}

/* ============================================================
   Pricing
   ============================================================ */

.ac-pricing {
    max-width: 520px;
    margin: 0 auto;
    background: var(--ac-white);
    border: 2px solid var(--ac-primary);
    border-radius: var(--ac-radius);
    padding: 48px 40px;
    text-align: center;
    position: relative;
    box-shadow: var(--ac-shadow-lg);
}

.ac-pricing__badge {
    position: absolute;
    top: -14px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--ac-primary);
    color: var(--ac-white);
    font-weight: 700;
    font-size: 0.8125rem;
    padding: 6px 20px;
    border-radius: 100px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.ac-pricing__price {
    font-size: 3.5rem;
    font-weight: 800;
    color: var(--ac-dark);
    line-height: 1;
    margin: 24px 0 4px;
}

.ac-pricing__price span {
    font-size: 1rem;
    font-weight: 600;
    color: var(--ac-gray-500);
}

.ac-pricing__annual {
    color: var(--ac-gray-500);
    font-size: 0.875rem;
    margin-bottom: 24px;
}

.ac-pricing__annual strong { color: var(--ac-green); }

.ac-pricing__features {
    text-align: left;
    margin: 24px 0 32px;
    list-style: none;
}

.ac-pricing__features li {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 8px 0;
    font-size: 0.9375rem;
    color: var(--ac-gray-700);
}

.ac-pricing__features li svg {
    width: 20px;
    height: 20px;
    stroke: var(--ac-green);
    fill: none;
    flex-shrink: 0;
    margin-top: 2px;
}

/* ============================================================
   Try It / Demo CTA
   ============================================================ */

.ac-demo-cta {
    background: linear-gradient(135deg, var(--ac-primary) 0%, #4f46e5 100%);
    padding: 64px 24px;
    text-align: center;
    color: var(--ac-white);
    border-radius: 0;
}

.ac-demo-cta h2 {
    color: var(--ac-white);
    margin-bottom: 12px;
}

.ac-demo-cta p {
    color: rgba(255,255,255,0.85);
    font-size: 1.0625rem;
    max-width: 560px;
    margin: 0 auto 32px;
}

.ac-demo-cta .ac-btn--accent { font-size: 1.125rem; }

/* ============================================================
   FAQ
   ============================================================ */

.ac-faq {
    max-width: 720px;
    margin: 0 auto;
}

.ac-faq-item {
    border-bottom: 1px solid var(--ac-border);
    padding: 20px 0;
}

.ac-faq-item__q {
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    font-weight: 700;
    font-size: 1.0625rem;
    color: var(--ac-dark);
    background: none;
    border: none;
    width: 100%;
    text-align: left;
    padding: 0;
    line-height: 1.4;
}

.ac-faq-item__q span {
    transition: transform 0.3s;
    font-size: 1.25rem;
    color: var(--ac-gray-500);
    flex-shrink: 0;
    margin-left: 16px;
}

.ac-faq-item.open .ac-faq-item__q span { transform: rotate(45deg); }

.ac-faq-item__a {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease, padding 0.3s ease;
    color: var(--ac-gray-500);
    font-size: 0.9375rem;
    line-height: 1.7;
}

.ac-faq-item.open .ac-faq-item__a {
    max-height: 300px;
    padding-top: 12px;
}

/* ============================================================
   Footer
   ============================================================ */

.ac-footer {
    background: var(--ac-dark);
    color: var(--ac-gray-300);
    padding: 56px 24px 32px;
}

.ac-footer__inner {
    max-width: var(--ac-max-width);
    margin: 0 auto;
}

.ac-footer__grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 48px;
    margin-bottom: 40px;
}

.ac-footer__brand h3 {
    color: var(--ac-white);
    font-size: 1.25rem;
    margin-bottom: 8px;
}

.ac-footer__brand p {
    font-size: 0.875rem;
    line-height: 1.7;
    max-width: 320px;
}

.ac-footer__col h4 {
    color: var(--ac-white);
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 16px;
}

.ac-footer__col a {
    display: block;
    color: var(--ac-gray-300);
    font-size: 0.875rem;
    padding: 4px 0;
    transition: color var(--ac-transition);
}

.ac-footer__col a:hover { color: var(--ac-white); }

.ac-footer__bottom {
    border-top: 1px solid rgba(255,255,255,0.1);
    padding-top: 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.8125rem;
    flex-wrap: wrap;
    gap: 12px;
}

.ac-footer__bottom a {
    color: var(--ac-gray-300);
}
.ac-footer__bottom a:hover { color: var(--ac-white); }

/* ============================================================
   Responsive
   ============================================================ */

@media (max-width: 768px) {
    .ac-nav__links { display: none; }
    .ac-hamburger { display: block; }

    .ac-hero { padding: 120px 20px 60px; }

    .ac-steps { grid-template-columns: 1fr; gap: 24px; }
    .ac-features { grid-template-columns: 1fr; }

    .ac-pricing { padding: 40px 24px; }

    .ac-footer__grid { grid-template-columns: 1fr; gap: 32px; }
    .ac-footer__bottom { flex-direction: column; text-align: center; }
}

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