/* ==========================================================================
   Design System Variables
   ========================================================================== */

html {
    /* Colors - Brand */
    --color-brand-primary: #2563eb;
    --color-brand-primary-hover: #1d4ed8;
    --color-brand-primary-light: #dbeafe;
    --color-brand-secondary: #0f172a;

    /* Colors - Text */
    --color-text-body: #334155;
    --color-text-heading: #0f172a;
    --color-text-note: #64748b;
    --color-text-inverse: #ffffff;

    /* Colors - UI */
    --color-background-page: #ffffff;
    --color-background-section: #f8fafc;
    --color-background-card: #ffffff;
    --color-border-default: #e2e8f0;
    --color-border-hover: #cbd5e1;

    /* Colors - Buttons */
    --color-button-primary: var(--color-brand-primary);
    --color-button-primary-hover: var(--color-brand-primary-hover);
    --color-button-primary-content: var(--color-text-inverse);
    --color-button-secondary: transparent;
    --color-button-secondary-hover: var(--color-brand-primary-light);
    --color-button-secondary-content: var(--color-brand-primary);

    /* Typography */
    --text-body-font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --text-body-font-size: 1rem;
    --text-body-line-height: 1.6;

    --text-heading-font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --text-heading-font-weight: 700;

    --text-hero-font-size: 3.5rem;
    --text-hero-line-height: 1.1;

    --text-section-heading-font-size: 2.25rem;
    --text-section-heading-line-height: 1.2;

    --text-card-heading-font-size: 1.25rem;
    --text-card-heading-line-height: 1.4;

    --text-note-font-size: 0.875rem;
    --text-note-line-height: 1.5;

    /* Spacing */
    --spacing-content-xs: 0.5rem;
    --spacing-content-sm: 1rem;
    --spacing-content-md: 1.5rem;
    --spacing-content-lg: 2rem;
    --spacing-content-xl: 3rem;
    --spacing-content-2xl: 4rem;
    --spacing-content-3xl: 6rem;

    /* Dimensions */
    --dimension-layout-max-width: 1200px;
    --dimension-layout-horizontal-padding: 1.5rem;
    --dimension-card-border-radius: 1rem;
    --dimension-button-border-radius: 0.5rem;

    /* Shadows */
    --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.1), 0 1px 2px rgba(0, 0, 0, 0.06);
    --shadow-card-hover: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-modal: 0 25px 50px -12px rgba(0, 0, 0, 0.25);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-default: 200ms ease;
}

@media screen and (max-width: 768px) {
    html {
        --text-hero-font-size: 2.5rem;
        --text-section-heading-font-size: 1.75rem;
        --spacing-content-xl: 2rem;
        --spacing-content-2xl: 3rem;
        --spacing-content-3xl: 4rem;
    }
}

/* ==========================================================================
   Base Styles
   ========================================================================== */

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

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    padding: 0;
    font-family: var(--text-body-font-family);
    font-size: var(--text-body-font-size);
    line-height: var(--text-body-line-height);
    color: var(--color-text-body);
    background-color: var(--color-background-page);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
    margin: 0;
    font-family: var(--text-heading-font-family);
    font-weight: var(--text-heading-font-weight);
    color: var(--color-text-heading);
}

p {
    margin: 0;
}

a {
    color: var(--color-brand-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--color-brand-primary-hover);
}

ul {
    margin: 0;
    padding: 0;
    list-style: none;
}

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

/* ==========================================================================
   Buttons
   ========================================================================== */

.button-primary,
.button-secondary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.875rem 1.75rem;
    font-family: var(--text-body-font-family);
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--dimension-button-border-radius);
    border: 2px solid transparent;
    cursor: pointer;
    transition: all var(--transition-default);
}

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

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

.button-secondary {
    background-color: var(--color-button-secondary);
    color: var(--color-button-secondary-content);
    border-color: var(--color-brand-primary);
}

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

.button-large {
    padding: 1rem 2.5rem;
    font-size: 1.125rem;
}

.button-full {
    width: 100%;
}

.button-header {
    padding: 0.625rem 1.25rem;
    font-size: 0.875rem;
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */

.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border-default);
}

.navigation {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: var(--dimension-layout-max-width);
    margin: 0 auto;
    padding: var(--spacing-content-sm) var(--dimension-layout-horizontal-padding);
}

.logo {
    text-decoration: none;
}

.logo-text {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-text-heading);
    letter-spacing: -0.02em;
}

.navigation-links {
    display: flex;
    gap: var(--spacing-content-lg);
}

.navigation-links a {
    color: var(--color-text-body);
    font-weight: 500;
}

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

@media screen and (max-width: 768px) {
    .navigation-links {
        display: none;
    }

    .button-header {
        padding: 0.5rem 1rem;
    }
}

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

.hero {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-content-2xl);
    align-items: center;
    max-width: var(--dimension-layout-max-width);
    margin: 0 auto;
    padding: calc(80px + var(--spacing-content-3xl)) var(--dimension-layout-horizontal-padding) var(--spacing-content-3xl);
}

.hero h1 {
    font-size: var(--text-hero-font-size);
    line-height: var(--text-hero-line-height);
    letter-spacing: -0.02em;
}

.hero-subtitle {
    margin-top: var(--spacing-content-md);
    font-size: 1.25rem;
    color: var(--color-text-note);
    max-width: 500px;
}

.hero .button-primary {
    margin-top: var(--spacing-content-lg);
}

.hero-note {
    margin-top: var(--spacing-content-sm);
    font-size: var(--text-note-font-size);
    color: var(--color-text-note);
}

.hero-visual {
    display: flex;
    justify-content: center;
}

.phone-mockup {
    width: 280px;
    height: 560px;
    background: var(--color-text-heading);
    border-radius: 40px;
    padding: 12px;
    box-shadow: var(--shadow-modal);
}

.phone-screen {
    width: 100%;
    height: 100%;
    background: var(--color-background-page);
    border-radius: 32px;
    overflow: hidden;
}

.app-preview {
    padding: var(--spacing-content-lg);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-content-lg);
}

.app-header-preview {
    height: 24px;
    background: var(--color-border-default);
    border-radius: 4px;
    width: 60%;
}

.app-calendar-preview {
    display: flex;
    gap: var(--spacing-content-sm);
    justify-content: center;
}

.calendar-dot {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--color-border-default);
}

.calendar-dot.selected {
    background: var(--color-brand-primary);
}

.app-time-slots {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-content-xs);
}

.time-slot {
    padding: var(--spacing-content-sm);
    background: var(--color-background-section);
    border-radius: var(--dimension-button-border-radius);
    font-size: var(--text-note-font-size);
    text-align: center;
    color: var(--color-text-note);
}

.time-slot.selected {
    background: var(--color-brand-primary-light);
    color: var(--color-brand-primary);
    font-weight: 600;
}

.app-button-preview {
    padding: var(--spacing-content-sm);
    background: var(--color-brand-primary);
    color: var(--color-text-inverse);
    border-radius: var(--dimension-button-border-radius);
    text-align: center;
    font-weight: 600;
    font-size: var(--text-note-font-size);
}

@media screen and (max-width: 900px) {
    .hero {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-subtitle {
        margin-left: auto;
        margin-right: auto;
    }

    .hero-visual {
        order: -1;
    }

    .phone-mockup {
        width: 220px;
        height: 440px;
    }
}

/* ==========================================================================
   Social Proof
   ========================================================================== */

.social-proof {
    padding: var(--spacing-content-xl) var(--dimension-layout-horizontal-padding);
    background-color: var(--color-background-section);
    text-align: center;
}

.social-proof-text {
    max-width: var(--dimension-layout-max-width);
    margin: 0 auto;
    font-size: 1.125rem;
    color: var(--color-text-note);
    font-style: italic;
}

/* ==========================================================================
   Promo Video
   ========================================================================== */

.promo-video {
    position: relative;
    width: 100%;
    overflow: hidden;
}

.promo-video video {
    display: block;
    width: 100%;
    height: auto;
    max-height: 80vh;
    object-fit: cover;
}

.video-mute-button {
    position: absolute;
    bottom: var(--spacing-content-lg);
    right: var(--spacing-content-lg);
    width: 48px;
    height: 48px;
    background: rgba(0, 0, 0, 0.6);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color var(--transition-default);
}

.video-mute-button:hover {
    background: rgba(0, 0, 0, 0.8);
}

.video-mute-button svg {
    width: 24px;
    height: 24px;
    color: var(--color-text-inverse);
}

.video-mute-button .icon-unmuted {
    display: none;
}

.video-mute-button .icon-muted {
    display: block;
}

.video-mute-button.unmuted .icon-unmuted {
    display: block;
}

.video-mute-button.unmuted .icon-muted {
    display: none;
}

@media screen and (max-width: 768px) {
    .video-mute-button {
        width: 40px;
        height: 40px;
        bottom: var(--spacing-content-sm);
        right: var(--spacing-content-sm);
    }

    .video-mute-button svg {
        width: 20px;
        height: 20px;
    }
}

/* ==========================================================================
   Section Styling
   ========================================================================== */

.section-heading {
    font-size: var(--text-section-heading-font-size);
    line-height: var(--text-section-heading-line-height);
    text-align: center;
    margin-bottom: var(--spacing-content-2xl);
}

/* ==========================================================================
   Benefits Section
   ========================================================================== */

.benefits {
    max-width: var(--dimension-layout-max-width);
    margin: 0 auto;
    padding: var(--spacing-content-3xl) var(--dimension-layout-horizontal-padding);
}

.benefits-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-content-lg);
}

.benefit-card {
    padding: var(--spacing-content-lg);
    background: var(--color-background-card);
    border: 1px solid var(--color-border-default);
    border-radius: var(--dimension-card-border-radius);
    text-align: center;
    transition: all var(--transition-default);
}

.benefit-card:hover {
    border-color: var(--color-border-hover);
    box-shadow: var(--shadow-card-hover);
    transform: translateY(-2px);
}

.benefit-icon {
    width: 48px;
    height: 48px;
    margin: 0 auto var(--spacing-content-md);
    color: var(--color-brand-primary);
}

.benefit-icon svg {
    width: 100%;
    height: 100%;
}

.benefit-card h3 {
    font-size: var(--text-card-heading-font-size);
    margin-bottom: var(--spacing-content-xs);
}

.benefit-card p {
    color: var(--color-text-note);
    font-size: var(--text-note-font-size);
}

@media screen and (max-width: 900px) {
    .benefits-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media screen and (max-width: 600px) {
    .benefits-grid {
        grid-template-columns: 1fr;
    }
}

/* ==========================================================================
   How It Works Section
   ========================================================================== */

.how-it-works {
    padding: var(--spacing-content-3xl) var(--dimension-layout-horizontal-padding);
    background-color: var(--color-background-section);
}

.steps {
    display: flex;
    align-items: flex-start;
    justify-content: center;
    gap: 0;
    max-width: var(--dimension-layout-max-width);
    margin: 0 auto;
}

.step {
    flex: 1;
    max-width: 250px;
    text-align: center;
    padding: 0 var(--spacing-content-sm);
}

.step-number {
    width: 48px;
    height: 48px;
    margin: 0 auto var(--spacing-content-md);
    background: var(--color-brand-primary);
    color: var(--color-text-inverse);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    font-weight: 700;
}

.step h3 {
    font-size: var(--text-card-heading-font-size);
    margin-bottom: var(--spacing-content-xs);
}

.step p {
    color: var(--color-text-note);
    font-size: var(--text-note-font-size);
}

.step-connector {
    width: 60px;
    height: 2px;
    background: var(--color-border-default);
    margin-top: 24px;
    flex-shrink: 0;
}

@media screen and (max-width: 900px) {
    .steps {
        flex-direction: column;
        align-items: center;
        gap: var(--spacing-content-lg);
    }

    .step-connector {
        width: 2px;
        height: 40px;
        margin-top: 0;
    }
}

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

.pricing {
    max-width: var(--dimension-layout-max-width);
    margin: 0 auto;
    padding: var(--spacing-content-3xl) var(--dimension-layout-horizontal-padding);
}

.pricing-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-content-lg);
    align-items: start;
}

.pricing-card {
    padding: var(--spacing-content-xl);
    background: var(--color-background-card);
    border: 1px solid var(--color-border-default);
    border-radius: var(--dimension-card-border-radius);
    text-align: center;
    position: relative;
}

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

.featured-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    padding: 0.375rem 1rem;
    background: var(--color-brand-primary);
    color: var(--color-text-inverse);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-radius: 100px;
}

.pricing-card h3 {
    font-size: var(--text-card-heading-font-size);
    margin-bottom: var(--spacing-content-md);
}

.price {
    margin-bottom: var(--spacing-content-lg);
}

.price-amount {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--color-text-heading);
}

.price-unit {
    font-size: 1rem;
    color: var(--color-text-note);
}

.pricing-features {
    text-align: left;
    margin-bottom: var(--spacing-content-lg);
}

.pricing-features li {
    padding: var(--spacing-content-xs) 0;
    padding-left: 1.5rem;
    position: relative;
    color: var(--color-text-body);
    font-size: var(--text-note-font-size);
}

.pricing-features li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 16px;
    height: 16px;
    background: var(--color-brand-primary-light);
    border-radius: 50%;
}

.pricing-features li::after {
    content: "";
    position: absolute;
    left: 5px;
    top: 50%;
    transform: translateY(-50%) rotate(45deg);
    width: 4px;
    height: 8px;
    border-right: 2px solid var(--color-brand-primary);
    border-bottom: 2px solid var(--color-brand-primary);
}

@media screen and (max-width: 900px) {
    .pricing-cards {
        grid-template-columns: 1fr;
        max-width: 400px;
        margin: 0 auto;
    }

    .pricing-card.featured {
        transform: none;
        order: -1;
    }
}

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

.faq {
    padding: var(--spacing-content-3xl) var(--dimension-layout-horizontal-padding);
    background-color: var(--color-background-section);
}

.faq-list {
    max-width: 700px;
    margin: 0 auto;
}

.faq-item {
    border-bottom: 1px solid var(--color-border-default);
}

.faq-item summary {
    padding: var(--spacing-content-md) 0;
    font-weight: 600;
    color: var(--color-text-heading);
    cursor: pointer;
    list-style: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.faq-item summary::-webkit-details-marker {
    display: none;
}

.faq-item summary::after {
    content: "+";
    font-size: 1.5rem;
    font-weight: 400;
    color: var(--color-text-note);
    transition: transform var(--transition-default);
}

.faq-item[open] summary::after {
    transform: rotate(45deg);
}

.faq-item p {
    padding-bottom: var(--spacing-content-md);
    color: var(--color-text-note);
}

/* ==========================================================================
   Final CTA Section
   ========================================================================== */

.final-cta {
    text-align: center;
    padding: var(--spacing-content-3xl) var(--dimension-layout-horizontal-padding);
    background: linear-gradient(135deg, var(--color-brand-primary) 0%, #1e40af 100%);
    color: var(--color-text-inverse);
}

.final-cta h2 {
    font-size: var(--text-section-heading-font-size);
    color: var(--color-text-inverse);
    margin-bottom: var(--spacing-content-sm);
}

.final-cta p {
    font-size: 1.125rem;
    opacity: 0.9;
    margin-bottom: var(--spacing-content-lg);
}

.final-cta .button-primary {
    background: var(--color-text-inverse);
    color: var(--color-brand-primary);
    border-color: var(--color-text-inverse);
}

.final-cta .button-primary:hover {
    background: rgba(255, 255, 255, 0.9);
}

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

.site-footer {
    padding: var(--spacing-content-2xl) var(--dimension-layout-horizontal-padding);
    background: var(--color-brand-secondary);
    color: var(--color-text-inverse);
}

.footer-content {
    max-width: var(--dimension-layout-max-width);
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: var(--spacing-content-xl);
    align-items: center;
}

.footer-brand .logo-text {
    color: var(--color-text-inverse);
}

.footer-brand p {
    margin-top: var(--spacing-content-xs);
    color: rgba(255, 255, 255, 0.7);
    font-size: var(--text-note-font-size);
}

.footer-links {
    display: flex;
    gap: var(--spacing-content-lg);
}

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    font-size: var(--text-note-font-size);
}

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

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

.footer-legal p {
    color: rgba(255, 255, 255, 0.5);
    font-size: var(--text-note-font-size);
}

@media screen and (max-width: 768px) {
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: var(--spacing-content-lg);
    }

    .footer-links {
        justify-content: center;
    }

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

/* ==========================================================================
   Modal
   ========================================================================== */

.modal {
    position: fixed;
    inset: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-default);
}

.modal.open {
    opacity: 1;
    visibility: visible;
}

.modal-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
}

.modal-content {
    position: relative;
    width: 90%;
    max-width: 440px;
    padding: var(--spacing-content-xl);
    background: var(--color-background-card);
    border-radius: var(--dimension-card-border-radius);
    box-shadow: var(--shadow-modal);
    transform: translateY(20px);
    transition: transform var(--transition-default);
}

.modal.open .modal-content {
    transform: translateY(0);
}

.modal-close {
    position: absolute;
    top: var(--spacing-content-sm);
    right: var(--spacing-content-sm);
    width: 32px;
    height: 32px;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--color-text-note);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: all var(--transition-fast);
}

.modal-close:hover {
    background: var(--color-background-section);
    color: var(--color-text-heading);
}

.modal-content h2 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-content-xs);
}

.modal-content > p {
    color: var(--color-text-note);
    margin-bottom: var(--spacing-content-lg);
}

/* ==========================================================================
   Form Styles
   ========================================================================== */

.form-field {
    margin-bottom: var(--spacing-content-md);
}

.form-field label {
    display: block;
    margin-bottom: var(--spacing-content-xs);
    font-weight: 500;
    color: var(--color-text-heading);
}

.form-field .optional {
    font-weight: 400;
    color: var(--color-text-note);
}

.form-field input {
    width: 100%;
    padding: 0.875rem 1rem;
    font-family: var(--text-body-font-family);
    font-size: 1rem;
    border: 1px solid var(--color-border-default);
    border-radius: var(--dimension-button-border-radius);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-field input:focus {
    outline: none;
    border-color: var(--color-brand-primary);
    box-shadow: 0 0 0 3px var(--color-brand-primary-light);
}

.form-field input::placeholder {
    color: var(--color-text-note);
}

.form-note {
    margin-top: var(--spacing-content-sm);
    text-align: center;
    font-size: var(--text-note-font-size);
    color: var(--color-text-note);
}

/* ==========================================================================
   Success State
   ========================================================================== */

.hidden {
    display: none !important;
}

#waitlist-success {
    text-align: center;
    padding: var(--spacing-content-lg) 0;
}

.success-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto var(--spacing-content-md);
    color: #22c55e;
}

.success-icon svg {
    width: 100%;
    height: 100%;
}

#waitlist-success h2 {
    margin-bottom: var(--spacing-content-xs);
}

#waitlist-success p {
    color: var(--color-text-note);
    margin-bottom: var(--spacing-content-lg);
}