/* ==========================================================================
   1. CSS Variables
   ========================================================================== */
:root {
    /* Colors - Light Mode (default) */
    --color-primary: #E85A4F;
    --color-primary-hover: #d44d42;
    --color-bg: #FAFAFA;
    --color-bg-alt: #F5F5F5;
    --color-text: #1A1A1A;
    --color-text-muted: #666666;
    --color-text-light: #888888;
    --color-border: #E5E5E5;
    --color-white: #FFFFFF;
    --color-success: #10B981;
    --color-error: #EF4444;
    --color-card-bg: #FFFFFF;
    --nav-bg-scrolled: rgba(250, 250, 250, 0.95);

    /* Typography */
    --font-display: 'Fraunces', Georgia, serif;
    --font-body: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;
    --spacing-section: 7rem;

    /* Layout */
    --max-width: 1140px;
    --nav-height: 72px;

    /* Border radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 24px;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
    --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.16);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 400ms ease;
}

/* Dark Mode Colors */
[data-theme="dark"] {
    --color-bg: #0F0F0F;
    --color-bg-alt: #1A1A1A;
    --color-text: #F5F5F5;
    --color-text-muted: #A0A0A0;
    --color-text-light: #707070;
    --color-border: #2A2A2A;
    --color-white: #1A1A1A;
    --color-card-bg: #1A1A1A;
    --nav-bg-scrolled: rgba(15, 15, 15, 0.95);
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.4);
    --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.5);
}

/* ==========================================================================
   2. Reset / Base Styles
   ========================================================================== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-body);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-bg);
}

img, svg {
    display: block;
    max-width: 100%;
}

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

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

ul, ol {
    list-style: none;
}

/* ==========================================================================
   3. Typography
   ========================================================================== */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: 600;
    line-height: 1.2;
    color: var(--color-text);
}

h1 {
    font-size: clamp(2.5rem, 5vw, 3.75rem);
    letter-spacing: -0.02em;
}

h2 {
    font-size: clamp(2rem, 4vw, 2.75rem);
    letter-spacing: -0.01em;
}

h3 {
    font-size: 1.25rem;
    font-weight: 600;
}

p {
    color: var(--color-text-muted);
}

.section-title {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
}

/* ==========================================================================
   4. Layout Utilities
   ========================================================================== */
.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

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

/* Fade-in animation */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity var(--transition-slow), transform var(--transition-slow);
}

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

/* ==========================================================================
   5. Navigation
   ========================================================================== */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav-height);
    background: transparent;
    z-index: 1000;
    transition: background var(--transition-base), box-shadow var(--transition-base);
}

.nav.scrolled {
    background: var(--nav-bg-scrolled);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.nav-logo {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--color-text);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-logo-img {
    width: 32px;
    height: 32px;
    border-radius: 8px;
}

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

.nav-links a {
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--color-text-muted);
    transition: color var(--transition-fast);
}

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

.nav-cta {
    display: none;
}

@media (min-width: 768px) {
    .nav-cta {
        display: inline-flex;
    }
}

/* Theme Toggle Button */
.theme-toggle {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text);
    background: transparent;
    transition: background var(--transition-fast), color var(--transition-fast);
    order: 10;
}

.theme-toggle:hover {
    background: var(--color-bg-alt);
}

.theme-toggle svg {
    width: 20px;
    height: 20px;
}

/* Light mode: show sun, hide moon */
.theme-toggle .icon-sun {
    display: block;
}

.theme-toggle .icon-moon {
    display: none;
}

/* Dark mode: show moon, hide sun */
[data-theme="dark"] .theme-toggle .icon-sun {
    display: none;
}

[data-theme="dark"] .theme-toggle .icon-moon {
    display: block;
}

/* ==========================================================================
   6. Buttons
   ========================================================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    border-radius: var(--radius-full);
    transition: all var(--transition-fast);
}

.btn-primary {
    background: var(--color-primary);
    color: var(--color-white);
    padding: 0.75rem 1.5rem;
}

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

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.0625rem;
}

/* ==========================================================================
   7. Hero Section
   ========================================================================== */
.hero {
    padding-top: calc(var(--nav-height) + var(--spacing-3xl));
    padding-bottom: var(--spacing-3xl);
    min-height: 100vh;
    display: flex;
    align-items: center;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-2xl);
    align-items: center;
}

@media (min-width: 992px) {
    .hero-grid {
        grid-template-columns: 1fr 1fr;
        gap: var(--spacing-3xl);
    }
}

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

@media (min-width: 992px) {
    .hero-content {
        text-align: left;
    }
}

.hero-badge {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    color: var(--color-primary);
    background: rgba(232, 90, 79, 0.1);
    padding: 0.375rem 0.75rem;
    border-radius: var(--radius-full);
    margin-bottom: var(--spacing-md);
}

.hero-title {
    margin-bottom: var(--spacing-md);
}

.hero-subtitle {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-lg);
    max-width: 480px;
}

@media (min-width: 992px) {
    .hero-subtitle {
        margin-left: 0;
        margin-right: auto;
    }
}

.hero-cta {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
}

@media (min-width: 992px) {
    .hero-cta {
        align-items: flex-start;
    }
}

.hero-note {
    font-size: 0.875rem;
    color: var(--color-text-light);
}

.hero-social-proof {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-primary);
    background: rgba(232, 90, 79, 0.1);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-full);
    display: inline-block;
}

/* Phone Mockup */
.hero-phone {
    display: flex;
    justify-content: center;
}

.phone-mockup {
    max-width: 340px;
    width: 100%;
    height: auto;
    filter: drop-shadow(0 25px 50px rgba(0, 0, 0, 0.15));
}

@media (min-width: 768px) {
    .phone-mockup {
        max-width: 380px;
    }
}

/* Light mode: show light phone, hide dark phone */
.phone-light {
    display: block;
}

.phone-dark {
    display: none;
}

/* Dark mode: show dark phone, hide light phone */
[data-theme="dark"] .phone-light {
    display: none;
}

[data-theme="dark"] .phone-dark {
    display: block;
}

/* ==========================================================================
   8. Value Comparison Section
   ========================================================================== */
.comparison {
    background: var(--color-card-bg);
}

.comparison-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
    max-width: 800px;
    margin: 0 auto;
}

@media (min-width: 768px) {
    .comparison-grid {
        grid-template-columns: 1fr 1fr;
    }
}

.comparison-card {
    background: var(--color-bg);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    border: 1px solid var(--color-border);
    position: relative;
}

.comparison-tulip {
    background: var(--color-card-bg);
    border: 2px solid var(--color-primary);
    box-shadow: var(--shadow-lg);
}

.comparison-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--color-primary);
    color: var(--color-white);
    font-size: 0.6875rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    padding: 0.375rem 0.875rem;
    white-space: nowrap;
    text-align: center;
    border-radius: var(--radius-full);
}

.comparison-card-title {
    font-family: var(--font-body);
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-sm);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.comparison-price {
    font-family: var(--font-display);
    font-size: 2.25rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--spacing-lg);
}

.comparison-price span {
    font-size: 1rem;
    font-weight: 400;
    color: var(--color-text-muted);
}

.comparison-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.comparison-list li {
    display: flex;
    align-items: flex-start;
    gap: 0.625rem;
    font-size: 0.9375rem;
    color: var(--color-text-muted);
}

.icon-check {
    color: var(--color-success);
    font-weight: 700;
}

.icon-x {
    color: var(--color-error);
    font-weight: 700;
}

.comparison-savings {
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--color-border);
    text-align: center;
    font-weight: 600;
    color: var(--color-success);
    font-size: 0.9375rem;
}

/* ==========================================================================
   9. Features Section
   ========================================================================== */
.features-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
}

@media (min-width: 768px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 992px) {
    .features-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.feature-card {
    background: var(--color-card-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    transition: box-shadow var(--transition-base), transform var(--transition-base);
}

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

.feature-icon {
    width: 48px;
    height: 48px;
    background: rgba(232, 90, 79, 0.1);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-md);
}

.feature-icon svg {
    width: 24px;
    height: 24px;
    stroke: var(--color-primary);
}

.feature-title {
    margin-bottom: var(--spacing-xs);
}

.feature-description {
    font-size: 0.9375rem;
    line-height: 1.5;
}

/* ==========================================================================
   10. How It Works Section
   ========================================================================== */
.how-it-works {
    background: var(--color-card-bg);
}

.steps {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-lg);
    max-width: 900px;
    margin: 0 auto;
}

@media (min-width: 768px) {
    .steps {
        flex-direction: row;
        align-items: flex-start;
        gap: 0;
    }
}

.step {
    flex: 1;
    text-align: center;
    padding: 0 var(--spacing-md);
}

.step-number {
    width: 48px;
    height: 48px;
    background: var(--color-primary);
    color: var(--color-white);
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 600;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-md);
}

.step-title {
    margin-bottom: var(--spacing-xs);
}

.step-description {
    font-size: 0.9375rem;
}

.step-connector {
    display: none;
}

@media (min-width: 768px) {
    .step-connector {
        display: block;
        flex: 0 0 60px;
        height: 2px;
        background: var(--color-border);
        margin-top: 24px;
    }
}

/* ==========================================================================
   11. Pricing Section
   ========================================================================== */
.pricing {
    text-align: center;
}

.pricing-card {
    background: var(--color-card-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    max-width: 400px;
    margin: 0 auto;
    box-shadow: var(--shadow-lg);
}

.pricing-label {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--color-text-muted);
    background: var(--color-bg);
    padding: 0.375rem 0.75rem;
    border-radius: var(--radius-full);
    margin-bottom: var(--spacing-md);
}

.pricing-amount {
    display: flex;
    align-items: flex-start;
    justify-content: center;
    gap: 0.25rem;
    margin-bottom: var(--spacing-xs);
}

.pricing-currency {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 500;
    margin-top: 0.5rem;
}

.pricing-value {
    font-family: var(--font-display);
    font-size: 4.5rem;
    font-weight: 600;
    line-height: 1;
    color: var(--color-text);
}

.pricing-period {
    font-size: 1rem;
    color: var(--color-text-muted);
    margin-top: 2.5rem;
}

.pricing-tagline {
    font-size: 0.9375rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-lg);
}

.pricing-features {
    text-align: left;
    margin-bottom: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.pricing-features li {
    display: flex;
    align-items: center;
    gap: 0.625rem;
    font-size: 0.9375rem;
    color: var(--color-text-muted);
}

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

.faq-list {
    max-width: 680px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 0;
}

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

.faq-item:first-child {
    border-top: 1px solid var(--color-border);
}

.faq-question {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) 0;
    font-size: 1.0625rem;
    font-weight: 500;
    color: var(--color-text);
    text-align: left;
    transition: color var(--transition-fast);
}

.faq-question:hover {
    color: var(--color-primary);
}

.faq-icon {
    font-size: 1.5rem;
    font-weight: 300;
    color: var(--color-text-muted);
    transition: transform var(--transition-base);
}

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

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-base), padding var(--transition-base);
}

.faq-item.open .faq-answer {
    max-height: 300px;
    padding-bottom: var(--spacing-md);
}

.faq-answer p {
    font-size: 0.9375rem;
    line-height: 1.6;
}

/* ==========================================================================
   13. Final CTA Section
   ========================================================================== */
.final-cta {
    background: var(--color-bg-alt);
    text-align: center;
    padding: var(--spacing-3xl) 0;
}

.final-cta-title {
    margin-bottom: var(--spacing-xs);
}

.final-cta-subtitle {
    font-size: 1.25rem;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-lg);
}

.final-cta .btn {
    margin-bottom: var(--spacing-sm);
}

.final-cta-note {
    font-size: 0.875rem;
    color: var(--color-text-light);
}

/* ==========================================================================
   14. Footer
   ========================================================================== */
.footer {
    padding: var(--spacing-lg) 0;
    border-top: 1px solid var(--color-border);
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
}

@media (min-width: 768px) {
    .footer-content {
        flex-direction: row;
        justify-content: space-between;
    }
}

.footer-logo {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 600;
}

.footer-copyright {
    font-size: 0.875rem;
    color: var(--color-text-light);
}

/* ==========================================================================
   15. Beta Signup Forms
   ========================================================================== */
.beta-signup-form {
    width: 100%;
    max-width: 500px;
}

.form-row {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

@media (min-width: 768px) {
    .form-row {
        flex-direction: row;
        align-items: center;
    }
}

.form-input {
    flex: 1;
    padding: 0.875rem 1rem;
    font-size: 1rem;
    font-family: var(--font-body);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-card-bg);
    color: var(--color-text);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

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

.form-input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(232, 90, 79, 0.15);
}

.form-status {
    margin-top: 0.75rem;
    font-size: 0.875rem;
    text-align: center;
}

.form-status.success {
    color: var(--color-success);
}

.form-status.error {
    color: var(--color-error);
}

/* Inline form variant for pricing card */
.beta-signup-inline {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.beta-signup-inline .form-input {
    width: 100%;
}

.beta-signup-inline .btn {
    width: 100%;
}

.beta-signup-inline .form-status {
    margin-top: 0.5rem;
}

/* Hero form centering */
.hero-cta .beta-signup-form {
    margin: 0 auto;
}

@media (min-width: 992px) {
    .hero-cta .beta-signup-form {
        margin: 0;
    }
}

/* Final CTA form centering */
.final-cta .beta-signup-form {
    margin: 0 auto var(--spacing-sm);
}

/* ==========================================================================
   16. Responsive Adjustments
   ========================================================================== */
@media (max-width: 767px) {
    :root {
        --spacing-section: 4rem;
    }

    .section-title {
        margin-bottom: var(--spacing-2xl);
    }

    .hero {
        padding-top: calc(var(--nav-height) + var(--spacing-xl));
        min-height: auto;
    }

    .nav-links {
        display: none;
    }
}