/* =================================
   Variables & Reset
   ================================= */
:root {
    /* Colors */
    --primary-color: #3B82F6;
    --primary-dark: #2563EB;
    --primary-light: #60A5FA;
    --secondary-color: #10B981;
    --text-dark: #1F2937;
    --text-gray: #6B7280;
    --text-light: #9CA3AF;
    --bg-white: #FFFFFF;
    --bg-gray: #F9FAFB;
    --bg-dark: #111827;
    --border-color: #E5E7EB;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);

    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;

    /* Spacing */
    --spacing-xs: 8px;
    --spacing-sm: 16px;
    --spacing-md: 24px;
    --spacing-lg: 32px;
    --spacing-xl: 48px;
    --spacing-2xl: 60px;
    --spacing-3xl: 80px;

    /* Typography */
    --font-size-sm: 14px;
    --font-size-base: 16px;
    --font-size-lg: 18px;
    --font-size-xl: 20px;
    --font-size-2xl: 24px;
    --font-size-3xl: 28px;
    --font-size-4xl: 36px;
    --font-size-5xl: 48px;

    /* Animation */
    --transition: all 0.3s ease;

    /* Touch Targets */
    --touch-target-min: 44px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    color: var(--text-dark);
    line-height: 1.6;
    background: var(--bg-white);
}

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

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

ul {
    list-style: none;
}

button {
    border: none;
    background: none;
    cursor: pointer;
    font-family: inherit;
}

/* Skip to content link for accessibility */
.skip-to-content {
    position: absolute;
    top: -100px;
    left: 0;
    background: var(--primary-color);
    color: white;
    padding: 12px 24px;
    text-decoration: none;
    font-weight: 600;
    z-index: 9999;
    border-radius: 0 0 var(--radius-sm) 0;
}

.skip-to-content:focus {
    top: 0;
}

/* Focus indicators for accessibility */
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible {
    outline: 3px solid var(--primary-color);
    outline-offset: 2px;
}

/* =================================
   Container & Layout
   ================================= */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

section {
    padding: var(--spacing-3xl) 0;
}

.section-header {
    margin-bottom: var(--spacing-xl);
}

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

.section-header h2 {
    font-size: clamp(28px, 4vw, 36px);
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 12px;
}

.section-header p {
    font-size: clamp(16px, 2vw, 18px);
    color: var(--text-gray);
}

/* =================================
   Typography
   ================================= */
h1, h2, h3, h4, h5, h6 {
    line-height: 1.2;
    font-weight: 600;
}

/* =================================
   Buttons
   ================================= */
.btn {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 12px 24px;
    border-radius: var(--radius-sm);
    font-size: 16px;
    font-weight: 600;
    transition: var(--transition);
    cursor: pointer;
    text-align: center;
}

.btn-main-text {
    display: block;
}

.btn-sub-text {
    display: block;
    font-size: 13px;
    font-weight: 400;
    opacity: 0.9;
    margin-top: 2px;
}

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

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

.btn-secondary {
    background: var(--bg-gray);
    color: var(--text-dark);
}

.btn-secondary:hover {
    background: var(--border-color);
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
}

.btn-outline:hover {
    background: var(--primary-color);
    color: white;
}

.btn-lg {
    padding: 16px 32px;
    font-size: 18px;
}

.btn-block {
    width: 100%;
}

.btn-nav {
    padding: 8px 20px;
    background: var(--primary-color);
    color: white;
    border-radius: var(--radius-sm);
}

.btn-icon {
    min-width: 44px;
    min-height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: var(--bg-gray);
    color: var(--text-dark);
    font-size: 20px;
    cursor: pointer;
    padding: 8px;
}

.btn-icon:hover {
    background: var(--border-color);
}

.btn-icon:focus-visible {
    outline: 3px solid var(--primary-color);
    outline-offset: 2px;
}

/* =================================
   Navigation
   ================================= */
.navbar {
    background: white;
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow-sm);
}

.nav-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 20px;
    font-weight: 700;
    color: var(--text-dark);
}

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

.nav-menu {
    display: flex;
    gap: 32px;
    align-items: center;
}

.nav-menu a {
    color: var(--text-gray);
    font-weight: 500;
    transition: var(--transition);
}

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

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 4px;
}

.mobile-menu-btn span {
    width: 24px;
    height: 2px;
    background: var(--text-dark);
    transition: var(--transition);
}

/* =================================
   Hero Section
   ================================= */
.hero {
    padding: 80px 0 120px;
    background: linear-gradient(135deg, #F9FAFB 0%, #EFF6FF 100%);
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-text {
    animation: fadeInUp 0.8s ease;
}

.badge {
    display: inline-block;
    padding: 6px 16px;
    background: #DBEAFE;
    color: var(--primary-color);
    border-radius: 20px;
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 20px;
}

.hero h1 {
    font-size: clamp(32px, 5vw, 56px);
    font-weight: 800;
    color: var(--text-dark);
    margin-bottom: var(--spacing-md);
    line-height: 1.1;
}

.highlight {
    color: var(--primary-color);
    position: relative;
}

.hero-description {
    font-size: clamp(16px, 2.5vw, 20px);
    color: var(--text-gray);
    margin-bottom: var(--spacing-lg);
    line-height: 1.6;
}

.hero-cta {
    display: flex;
    gap: 16px;
    margin-bottom: 48px;
}

.hero-stats {
    display: flex;
    gap: 40px;
}

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

.stat-number {
    font-size: 32px;
    font-weight: 700;
    color: var(--primary-color);
}

.stat-label {
    font-size: 14px;
    color: var(--text-gray);
}

/* Hero Image / Mockup */
.hero-image {
    position: relative;
    animation: fadeInRight 0.8s ease;
}

.mockup-container {
    position: relative;
}

.mockup-screen {
    background: white;
    border-radius: var(--radius-lg);
    padding: 24px;
    box-shadow: var(--shadow-xl);
    position: relative;
    z-index: 2;
}

.mockup-glow {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 120%;
    height: 120%;
    background: radial-gradient(circle, rgba(59, 130, 246, 0.2) 0%, transparent 70%);
    z-index: 1;
    animation: pulse 3s ease-in-out infinite;
}

.calendar-mockup {
    background: var(--bg-gray);
    border-radius: var(--radius-md);
    padding: 16px;
}

.calendar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}

.calendar-date {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-dark);
}

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

.calendar-grid {
    display: grid;
    gap: 8px;
}

.time-slot {
    background: white;
    border-radius: var(--radius-sm);
    padding: 12px;
    min-height: 60px;
    display: flex;
    flex-direction: column;
    gap: 4px;
    transition: var(--transition);
}

.time-slot.empty {
    border: 2px dashed var(--border-color);
    justify-content: center;
    align-items: center;
    color: var(--text-light);
    font-size: 14px;
}

.time-slot.booked {
    background: #DBEAFE;
    border-left: 4px solid var(--primary-color);
}

.slot-time {
    font-size: 12px;
    color: var(--text-gray);
}

.slot-patient {
    font-weight: 600;
    color: var(--text-dark);
}

.slot-service {
    font-size: 12px;
    color: var(--primary-color);
}

/* =================================
   Problems Section
   ================================= */
.problems {
    background: var(--bg-white);
}

.problems-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
}

.problem-card {
    background: #FEF2F2;
    padding: 32px;
    border-radius: var(--radius-md);
    border-left: 4px solid #EF4444;
}

.problem-icon {
    font-size: 40px;
    margin-bottom: 16px;
}

.problem-card h3 {
    font-size: 20px;
    color: var(--text-dark);
    margin-bottom: 12px;
}

.problem-card p {
    color: var(--text-gray);
    line-height: 1.6;
}

/* =================================
   Features Section
   ================================= */
.features {
    background: var(--bg-gray);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.feature-card {
    background: white;
    padding: 32px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

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

.feature-icon {
    font-size: 48px;
    margin-bottom: 16px;
}

.feature-card h3 {
    font-size: 18px;
    color: var(--text-dark);
    margin-bottom: 12px;
}

.feature-card p {
    color: var(--text-gray);
    font-size: 14px;
    line-height: 1.6;
}

/* =================================
   How It Works Section
   ================================= */
.how-it-works {
    background: white;
}

.steps {
    display: grid;
    gap: 48px;
    max-width: 800px;
    margin: 0 auto;
}

.step {
    display: grid;
    grid-template-columns: 80px 1fr;
    gap: 32px;
    align-items: flex-start;
}

.step-number {
    width: 80px;
    height: 80px;
    background: var(--primary-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 32px;
    font-weight: 700;
    flex-shrink: 0;
}

.step-content h3 {
    font-size: 24px;
    color: var(--text-dark);
    margin-bottom: 12px;
}

.step-content p {
    color: var(--text-gray);
    font-size: 16px;
    line-height: 1.6;
}

/* =================================
   Testimonials Section
   ================================= */
.testimonials {
    background: var(--bg-gray);
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.testimonial-card {
    background: white;
    padding: 32px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}

.testimonial-stars {
    color: #FBBF24;
    font-size: 20px;
    margin-bottom: 16px;
}

.testimonial-text {
    color: var(--text-dark);
    font-size: 16px;
    line-height: 1.6;
    margin-bottom: 24px;
}

.testimonial-author {
    display: flex;
    gap: 16px;
    align-items: center;
}

.author-avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--primary-color);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    flex-shrink: 0;
}

.author-name {
    font-weight: 600;
    color: var(--text-dark);
}

.author-role {
    font-size: 14px;
    color: var(--text-gray);
}

/* =================================
   Pricing Section
   ================================= */
.pricing {
    background: white;
}

.pricing-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
    margin-bottom: 32px;
}

.pricing-card {
    background: white;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 40px;
    position: relative;
    transition: var(--transition);
}

.pricing-card:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-lg);
}

.pricing-card.featured {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-lg);
    transform: scale(1.05);
}

.pricing-badge {
    display: inline-block;
    padding: 6px 16px;
    background: var(--bg-gray);
    color: var(--text-gray);
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    margin-bottom: 16px;
}

.pricing-badge.popular {
    background: var(--primary-color);
    color: white;
}

.pricing-card h3 {
    font-size: 24px;
    color: var(--text-dark);
    margin-bottom: 16px;
}

.price {
    margin-bottom: 32px;
}

.price-amount {
    font-size: 48px;
    font-weight: 700;
    color: var(--text-dark);
}

.price-period {
    font-size: 16px;
    color: var(--text-gray);
}

.pricing-features {
    margin-bottom: 32px;
}

.pricing-features li {
    padding: 12px 0;
    color: var(--text-dark);
    border-bottom: 1px solid var(--border-color);
}

.pricing-features li:last-child {
    border-bottom: none;
}

.pricing-note {
    text-align: center;
    padding: 24px;
    background: #FEF3C7;
    border-radius: var(--radius-md);
}

.pricing-note p {
    color: #92400E;
    font-weight: 500;
}

/* =================================
   FAQ Section
   ================================= */
.faq {
    background: var(--bg-gray);
}

.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background: white;
    border-radius: var(--radius-md);
    margin-bottom: 16px;
    overflow: hidden;
}

.faq-question {
    width: 100%;
    padding: 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    text-align: left;
    font-size: 18px;
    font-weight: 600;
    color: var(--text-dark);
    cursor: pointer;
    transition: var(--transition);
}

.faq-question:hover {
    background: var(--bg-gray);
}

.faq-icon {
    font-size: 24px;
    color: var(--primary-color);
    font-weight: 300;
    transition: var(--transition);
}

.faq-item.active .faq-icon {
    transform: rotate(45deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.faq-item.active .faq-answer {
    max-height: 500px;
}

.faq-answer p {
    padding: 0 24px 24px;
    color: var(--text-gray);
    line-height: 1.6;
}

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

.cta-content {
    text-align: center;
    max-width: 700px;
    margin: 0 auto;
}

.cta h2 {
    font-size: 40px;
    color: white;
    margin-bottom: 16px;
}

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

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

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

.cta .btn-primary:hover {
    background: var(--bg-gray);
}

.cta .btn-secondary {
    background: transparent;
    border: 2px solid white;
    color: white;
}

.cta .btn-secondary:hover {
    background: white;
    color: var(--primary-color);
}

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

/* =================================
   Contact Section
   ================================= */
.contact {
    background: white;
}

.contact-wrapper {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 60px;
}

.contact-info h3 {
    font-size: 24px;
    color: var(--text-dark);
    margin-bottom: 12px;
}

.contact-info > p {
    color: var(--text-gray);
    margin-bottom: 32px;
}

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

.contact-item {
    display: flex;
    gap: 16px;
    align-items: flex-start;
}

.contact-icon {
    width: 48px;
    height: 48px;
    background: var(--bg-gray);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    flex-shrink: 0;
}

.contact-label {
    font-size: 14px;
    color: var(--text-gray);
    margin-bottom: 4px;
}

.contact-value {
    font-size: 16px;
    color: var(--text-dark);
    font-weight: 600;
}

.contact-form-wrapper {
    position: relative;
}

.contact-form {
    background: var(--bg-gray);
    padding: 40px;
    border-radius: var(--radius-lg);
}

.form-group {
    margin-bottom: 24px;
}

.form-group label {
    display: block;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 8px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 16px;
    font-family: inherit;
    transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

.form-group textarea {
    resize: vertical;
}

.form-message {
    margin-top: 16px;
    padding: 16px;
    border-radius: var(--radius-sm);
    text-align: center;
    font-weight: 600;
}

.form-message.success {
    background: #D1FAE5;
    color: #065F46;
}

.form-message.error {
    background: #FEE2E2;
    color: #991B1B;
}

.btn-loading {
    position: relative;
    color: transparent;
    pointer-events: none;
}

.btn-loading::after {
    content: '';
    position: absolute;
    width: 16px;
    height: 16px;
    top: 50%;
    left: 50%;
    margin-left: -8px;
    margin-top: -8px;
    border: 2px solid #ffffff;
    border-radius: 50%;
    border-top-color: transparent;
    animation: spinner 0.6s linear infinite;
}

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

/* =================================
   Footer
   ================================= */
.footer {
    background: var(--bg-dark);
    color: white;
    padding: 60px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 60px;
    margin-bottom: 40px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 16px;
}

.footer-description {
    color: var(--text-light);
    line-height: 1.6;
}

.footer-section h4 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 16px;
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-links a {
    color: var(--text-light);
    transition: var(--transition);
}

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

.footer-link-disabled {
    color: var(--text-light);
    opacity: 0.5;
    cursor: not-allowed;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--text-light);
    font-size: 14px;
}

/* =================================
   Animations
   ================================= */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes pulse {
    0%, 100% {
        opacity: 0.6;
        transform: translate(-50%, -50%) scale(1);
    }
    50% {
        opacity: 0.8;
        transform: translate(-50%, -50%) scale(1.05);
    }
}

/* =================================
   Responsive Design
   ================================= */
@media (max-width: 1024px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .footer-content {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    section {
        padding: 60px 0;
    }

    .hero {
        padding: 60px 0;
    }

    .hero h1 {
        font-size: 36px;
    }

    .hero-description {
        font-size: 16px;
    }

    .hero-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }

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

    .hero-stats {
        flex-direction: column;
        gap: 20px;
    }

    .section-header h2 {
        font-size: 28px;
    }

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

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

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

    .pricing-cards {
        grid-template-columns: 1fr;
    }

    .pricing-card.featured {
        transform: scale(1);
    }

    .contact-wrapper {
        grid-template-columns: 1fr;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .footer-bottom {
        flex-direction: column;
        gap: 12px;
        text-align: center;
    }

    /* Mobile Navigation */
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background: white;
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: var(--shadow-lg);
        padding: 20px 0;
    }

    .nav-menu.active {
        left: 0;
    }

    .mobile-menu-btn {
        display: flex;
    }

    .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(7px, -6px);
    }

    .cta-buttons {
        flex-direction: column;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }

    .hero h1 {
        font-size: 28px;
    }

    .btn-lg {
        padding: 14px 24px;
        font-size: 16px;
    }

    .section-header h2 {
        font-size: 24px;
    }
}