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

:root {
    --primary: #3b82f6;
    --primary-dark: #2563eb;
    --primary-light: #60a5fa;
    --secondary: #8b5cf6;
    --background: #ffffff;
    --surface: #f8fafc;
    --surface-hover: #f1f5f9;
    --text: #0f172a;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --radius: 12px;
    --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
}

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

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

/* Navigation */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    z-index: 100;
}

.nav-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
    color: var(--text);
    font-weight: 600;
    font-size: 18px;
}

.logo svg {
    color: var(--primary);
}

.cta-button {
    padding: 8px 20px;
    background: var(--primary);
    color: white;
    text-decoration: none;
    border-radius: var(--radius);
    font-weight: 500;
    transition: all 0.2s;
}

.cta-button:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
}

/* Hero */
.hero {
    padding: 120px 0 80px;
    background: linear-gradient(180deg, var(--surface) 0%, var(--background) 100%);
}

.hero-content {
    text-align: center;
    margin-bottom: 60px;
}

.hero-title {
    font-size: clamp(36px, 5vw, 56px);
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 24px;
}

.gradient-text {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-description {
    font-size: 20px;
    color: var(--text-muted);
    margin-bottom: 32px;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    margin-bottom: 24px;
    flex-wrap: wrap;
}

.button {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: var(--radius);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.2s;
}

.button-primary {
    background: var(--primary);
    color: white;
}

.button-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.button-secondary {
    background: var(--surface);
    color: var(--text);
    border: 1px solid var(--border);
}

.button-secondary:hover {
    background: var(--surface-hover);
}

.button-large {
    padding: 16px 32px;
    font-size: 18px;
}

.hero-note {
    font-size: 14px;
    color: var(--text-muted);
}

/* Calendar Preview */
.hero-visual {
    display: flex;
    justify-content: center;
}

.calendar-preview {
    background: white;
    border-radius: 16px;
    box-shadow: 0 20px 25px -5px rgb(0 0 0 / 0.1);
    padding: 24px;
    max-width: 500px;
    width: 100%;
}

.calendar-header {
    background: var(--surface);
    margin: -24px -24px 24px;
    padding: 12px 24px;
    border-radius: 16px 16px 0 0;
}

.calendar-dots {
    display: flex;
    gap: 8px;
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--border);
}

.dot:first-child {
    background: #ef4444;
}

.dot:nth-child(2) {
    background: #eab308;
}

.dot:nth-child(3) {
    background: #22c55e;
}

.calendar-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
}

.time-slot {
    height: 40px;
    background: var(--surface);
    border-radius: 8px;
    border: 2px solid transparent;
    transition: all 0.2s;
}

.time-slot.available {
    background: #dcfce7;
    border-color: #86efac;
}

/* Features */
.features {
    padding: 80px 0;
}

.section-title {
    font-size: clamp(32px, 4vw, 48px);
    font-weight: 700;
    text-align: center;
    margin-bottom: 60px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
}

.feature {
    text-align: center;
}

.feature-icon {
    width: 56px;
    height: 56px;
    margin: 0 auto 16px;
    background: var(--surface);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
}

.feature h3 {
    font-size: 20px;
    margin-bottom: 8px;
}

.feature p {
    color: var(--text-muted);
    line-height: 1.6;
}

/* How It Works */
.how-it-works {
    padding: 80px 0;
    background: var(--surface);
}

.steps {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 32px;
    flex-wrap: wrap;
}

.step {
    text-align: center;
    max-width: 200px;
}

.step-number {
    width: 48px;
    height: 48px;
    background: var(--primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 16px;
    font-weight: 700;
    font-size: 20px;
}

.step h3 {
    font-size: 18px;
    margin-bottom: 8px;
}

.step p {
    color: var(--text-muted);
    font-size: 14px;
}

.step-arrow {
    color: var(--border);
}

/* Privacy */
.privacy {
    padding: 80px 0;
}

.privacy-content {
    max-width: 800px;
    margin: 0 auto;
}

.privacy-features {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.privacy-feature {
    display: flex;
    gap: 16px;
    padding: 24px;
    background: var(--surface);
    border-radius: var(--radius);
}

.privacy-feature svg {
    color: var(--primary);
    flex-shrink: 0;
}

.privacy-feature h4 {
    margin-bottom: 4px;
}

.privacy-feature p {
    color: var(--text-muted);
    font-size: 14px;
}

/* CTA Section */
.cta {
    padding: 80px 0;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: white;
}

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

.cta h2 {
    font-size: clamp(32px, 4vw, 48px);
    margin-bottom: 16px;
}

.cta p {
    font-size: 18px;
    margin-bottom: 32px;
    opacity: 0.9;
}

.cta .button-primary {
    background: white;
    color: var(--primary);
}

.cta .button-primary:hover {
    background: var(--surface);
}

.cta-note {
    font-size: 14px;
    opacity: 0.8;
    margin-top: 16px;
}

/* Footer */
.footer {
    padding: 40px 0;
    background: var(--surface);
    border-top: 1px solid var(--border);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: start;
    margin-bottom: 24px;
    flex-wrap: wrap;
    gap: 32px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 600;
    margin-bottom: 8px;
}

.footer-logo svg {
    color: var(--primary);
}

.footer-left p {
    color: var(--text-muted);
    font-size: 14px;
}

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

.footer-links a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 14px;
    transition: color 0.2s;
}

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

.footer-bottom {
    padding-top: 24px;
    border-top: 1px solid var(--border);
}

.footer-bottom p {
    color: var(--text-muted);
    font-size: 14px;
    text-align: center;
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .hero {
        padding: 100px 0 60px;
    }

    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }

    .button {
        width: 100%;
        justify-content: center;
        max-width: 300px;
    }

    .steps {
        flex-direction: column;
    }

    .step-arrow {
        transform: rotate(90deg);
    }

    .features-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .footer-content {
        flex-direction: column;
    }
}

/* Smooth scroll */
html {
    scroll-behavior: smooth;
}

/* Focus styles */
*:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

/* Dark mode support (optional) */
@media (prefers-color-scheme: dark) {
    :root {
        --background: #0f172a;
        --surface: #1e293b;
        --surface-hover: #334155;
        --text: #f8fafc;
        --text-muted: #94a3b8;
        --border: #334155;
    }

    .nav {
        background: rgba(15, 23, 42, 0.95);
    }

    .calendar-preview {
        background: var(--surface);
    }

    .cta .button-primary {
        background: white;
        color: var(--primary);
    }
}