/* ========================================
   Persist.Live Landing Page - Modern 2025 Design
   Pure.css + Custom CSS for optimal performance
   ======================================== */

/* ========================================
   1. CSS Variables
   ======================================== */
:root {
    /* Brand Colors */
    --brand-orange: #FF9500;
    --brand-orange-hover: #E68600;
    --brand-orange-light: rgba(255, 149, 0, 0.1);

    /* Light Mode - Soft, Professional */
    --bg-base: #FFFFFF;
    --bg-elevated: #FAFAFA;
    --bg-card: #FFFFFF;
    --text-primary: #0A0A0A;
    --text-secondary: #6B7280;
    --text-tertiary: #9CA3AF;
    --border-color: #E5E7EB;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.08);

    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-display: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;

    /* Spacing - Generous for modern look */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2.5rem;
    --spacing-xl: 4rem;
    --spacing-2xl: 6rem;

    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;

    /* Transitions */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Dark Mode - Elegant */
[data-theme="dark"] {
    --bg-base: #0A0A0A;
    --bg-elevated: #151515;
    --bg-card: #1A1A1A;
    --text-primary: #FAFAFA;
    --text-secondary: #A1A1AA;
    --text-tertiary: #71717A;
    --border-color: #27272A;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.5);
}

/* ========================================
   2. Base & Typography
   ======================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-family);
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-base);
    transition: background-color 0.3s ease, color 0.3s ease;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

section {
    padding: var(--spacing-xl) 0 var(--spacing-2xl);
}

/* Typography Scale */
h1, h2, h3, h4 {
    font-family: var(--font-display);
    font-weight: 700;
    line-height: 1.1;
    letter-spacing: -0.02em;
    color: var(--text-primary);
}

h1 { font-size: clamp(2.5rem, 5vw, 4rem); }
h2 { font-size: clamp(2rem, 4vw, 3rem); }
h3 { font-size: clamp(1.25rem, 2.5vw, 1.75rem); }
h4 { font-size: 1.125rem; }

p {
    font-size: 1.0625rem;
    line-height: 1.7;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

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

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

strong {
    font-weight: 600;
    color: var(--text-primary);
}

/* ========================================
   3. Navigation - Minimal & Clean
   ======================================== */
.navbar {
    position: sticky;
    top: 0;
    z-index: 1000;
    background-color: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    padding: var(--spacing-sm) 0;
    transition: var(--transition);
}

[data-theme="dark"] .navbar {
    background-color: rgba(10, 10, 10, 0.8);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.01em;
    display: flex;
    align-items: center;
}

.logo-dot {
    color: var(--brand-orange);
}

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

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

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

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

.dark-mode-toggle {
    background: none;
    border: none;
    font-size: 1.125rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    transition: var(--transition);
    display: flex;
    align-items: center;
}

.dark-mode-toggle:hover {
    background-color: var(--bg-elevated);
    color: var(--text-primary);
}

[data-theme="light"] .icon-moon,
[data-theme="dark"] .icon-sun {
    display: none;
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

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

@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: var(--bg-base);
        flex-direction: column;
        padding: var(--spacing-md);
        border-bottom: 1px solid var(--border-color);
        gap: var(--spacing-sm);
    }

    .nav-links.active {
        display: flex;
    }

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

/* ========================================
   4. Hero - Bold & Modern
   ======================================== */
.hero {
    position: relative;
    min-height: calc(100vh - 70px);
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: var(--spacing-2xl) 0;
    overflow: hidden;
}

.hero-gradient {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 50% 0%, rgba(255, 149, 0, 0.03) 0%, transparent 70%);
    pointer-events: none;
    z-index: 0;
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 800px;
    margin: 0 auto;
}

.hero-badge {
    display: inline-block;
    padding: 0.5rem 1rem;
    background-color: var(--brand-orange-light);
    color: var(--brand-orange);
    border-radius: 50px;
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    border: 1px solid rgba(255, 149, 0, 0.2);
}

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

.hero-subtitle {
    font-size: clamp(1.125rem, 2vw, 1.375rem);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    line-height: 1.5;
}

.hero-cta {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: var(--spacing-lg);
}

.hero-platforms {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    flex-wrap: wrap;
}

.platform-tag {
    padding: 0.375rem 0.875rem;
    background-color: var(--bg-elevated);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    color: var(--text-tertiary);
    font-weight: 500;
}

/* ========================================
   5. Buttons - Clean & Responsive
   ======================================== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.875rem 1.75rem;
    font-size: 1rem;
    font-weight: 600;
    text-align: center;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    white-space: nowrap;
}

.btn-primary {
    background-color: var(--brand-orange);
    color: white;
    box-shadow: 0 4px 14px rgba(255, 149, 0, 0.25);
}

.btn-primary:hover {
    background-color: var(--brand-orange-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(255, 149, 0, 0.35);
}

.btn-secondary {
    background-color: var(--bg-card);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    border-color: var(--text-tertiary);
    background-color: var(--bg-elevated);
}

.btn-large {
    padding: 1.125rem 2.25rem;
    font-size: 1.0625rem;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn svg {
    width: 18px;
    height: 18px;
}

.btn-loading .btn-text {
    display: inline;
}

.btn-loading .btn-loading {
    display: none;
}

.btn.loading .btn-text {
    display: none;
}

.btn.loading .btn-loading {
    display: inline;
}

/* ========================================
   6. Section Headers
   ======================================== */
.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto var(--spacing-xl);
}

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

.section-subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
}

/* ========================================
   7. Features - Bento Grid (Modern 2025)
   ======================================== */
.features {
    background-color: var(--bg-base);
}

.bento-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-xl);
}

.bento-item {
    padding: var(--spacing-lg);
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.bento-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--brand-orange), transparent);
    opacity: 0;
    transition: var(--transition);
}

.bento-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--brand-orange);
}

.bento-item:hover::before {
    opacity: 1;
}

.bento-item.featured {
    background: linear-gradient(135deg, var(--bg-card) 0%, rgba(255, 149, 0, 0.03) 100%);
    border-color: var(--brand-orange);
}

.bento-large {
    grid-column: span 2;
}

.bento-tall {
    grid-row: span 2;
}

.feature-label {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background-color: var(--brand-orange-light);
    color: var(--brand-orange);
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--spacing-sm);
}

.bento-content h3 {
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
}

.bento-content p {
    color: var(--text-secondary);
    font-size: 0.9375rem;
}

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

    .bento-large,
    .bento-tall {
        grid-column: span 1;
        grid-row: span 1;
    }
}

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

.steps {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
    max-width: 800px;
    margin: 0 auto;
}

.step {
    display: flex;
    gap: var(--spacing-md);
    align-items: flex-start;
}

.step-number {
    flex-shrink: 0;
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, var(--brand-orange) 0%, var(--brand-orange-hover) 100%);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    box-shadow: 0 4px 14px rgba(255, 149, 0, 0.25);
}

.step-content h3 {
    margin-bottom: var(--spacing-xs);
}

.step-content p {
    color: var(--text-secondary);
}

@media (max-width: 768px) {
    .step {
        flex-direction: column;
        text-align: center;
    }

    .step-number {
        margin: 0 auto;
    }
}

/* ========================================
   9. Forms - Clean & Modern
   ======================================== */
.waitlist,
.contact {
    background-color: var(--bg-base);
}

.waitlist-content {
    max-width: 600px;
    margin: 0 auto;
}

.waitlist-form,
.contact-form {
    background-color: var(--bg-card);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-lg);
}

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

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.875rem;
    font-size: 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background-color: var(--bg-base);
    color: var(--text-primary);
    font-family: var(--font-family);
    transition: var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--brand-orange);
    box-shadow: 0 0 0 3px var(--brand-orange-light);
}

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

.checkbox-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-xs);
    cursor: pointer;
    color: var(--text-secondary);
}

.checkbox-label input[type="checkbox"] {
    width: auto;
    cursor: pointer;
}

.form-message {
    margin-top: var(--spacing-md);
    padding: var(--spacing-sm);
    border-radius: var(--radius-sm);
    display: none;
    font-weight: 500;
}

.form-message.success {
    display: block;
    background-color: rgba(52, 199, 89, 0.1);
    color: #34C759;
    border: 1px solid rgba(52, 199, 89, 0.3);
}

.form-message.error {
    display: block;
    background-color: rgba(255, 59, 48, 0.1);
    color: #FF3B30;
    border: 1px solid rgba(255, 59, 48, 0.3);
}

/* ========================================
   10. Pricing
   ======================================== */
.pricing {
    background-color: var(--bg-elevated);
}

.pricing-card {
    max-width: 500px;
    margin: 0 auto;
    padding: var(--spacing-xl);
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: var(--shadow-lg);
}

.pricing-tag {
    display: inline-block;
    padding: 0.625rem 1.25rem;
    background-color: var(--brand-orange);
    color: white;
    border-radius: 50px;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

.pricing-features {
    list-style: none;
    text-align: left;
    margin: var(--spacing-lg) 0;
}

.pricing-features li {
    padding: var(--spacing-xs) 0;
    color: var(--text-secondary);
}

.pricing-note {
    margin-top: var(--spacing-md);
    font-weight: 600;
    color: var(--brand-orange);
}

/* ========================================
   11. FAQ - Accordion
   ======================================== */
.faq {
    background-color: var(--bg-base);
}

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

.faq-item {
    margin-bottom: var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: var(--transition);
}

.faq-item:hover {
    border-color: var(--brand-orange);
}

.faq-question {
    width: 100%;
    padding: var(--spacing-md);
    background-color: var(--bg-card);
    border: none;
    text-align: left;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--transition);
}

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

.faq-icon {
    font-size: 1.5rem;
    color: var(--brand-orange);
    transition: transform 0.3s ease;
    flex-shrink: 0;
}

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

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease;
}

.faq-item.active .faq-answer {
    max-height: 600px;
}

.faq-answer p, ol {
    padding: var(--spacing-sm);
    background-color: var(--bg-elevated);
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 0px;
}

.faq-answer ol {
    padding: 8px 36px;
}

/* ========================================
   12. Footer
   ======================================== */
.footer {
    background-color: var(--bg-card);
    border-top: 1px solid var(--border-color);
    padding: var(--spacing-xl) 0 var(--spacing-md);
}

.footer-content {
    display: grid;
    grid-template-columns: 1.5fr 2fr;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
}

.footer-brand p {
    color: var(--text-secondary);
    margin-top: var(--spacing-xs);
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing-lg);
}

.footer-column h4 {
    font-size: 0.875rem;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.footer-column ul {
    list-style: none;
}

.footer-column li {
    margin-bottom: var(--spacing-xs);
}

.footer-column a {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    transition: var(--transition);
}

.footer-column a:hover {
    color: var(--brand-orange);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border-color);
}

.footer-bottom p {
    color: var(--text-tertiary);
    font-size: 0.875rem;
}

@media (max-width: 768px) {
    .footer-content {
        grid-template-columns: 1fr;
    }
}

/* ========================================
   13. Legal Pages
   ======================================== */
.legal-page {
    padding: var(--spacing-2xl) 0;
    min-height: 70vh;
}

.legal-page .container {
    max-width: 850px;
}

.legal-page h1 {
    margin-bottom: var(--spacing-sm);
}

.last-updated {
    color: var(--text-tertiary);
    font-size: 0.875rem;
    margin-bottom: var(--spacing-xl);
}

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

.legal-section h2 {
    margin-top: var(--spacing-xl);
    margin-bottom: var(--spacing-md);
    font-size: 1.75rem;
}

.legal-section h3 {
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-sm);
    font-size: 1.25rem;
}

.legal-section ul {
    margin-left: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.legal-section li {
    margin-bottom: var(--spacing-xs);
    color: var(--text-secondary);
}

.legal-footer {
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
}

/* ========================================
   14. Utilities
   ======================================== */
section {
    scroll-margin-top: 25px;
}

/* Smooth Loading Animation */
@keyframes spin {
    to { transform: rotate(360deg); }
}

.loading::after {
    content: "";
    display: inline-block;
    width: 1em;
    height: 1em;
    border: 2px solid currentColor;
    border-right-color: transparent;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
    margin-left: 0.5em;
}

/* Fade-in Animation */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Apply fade-in to sections on load */
section {
    animation: fadeIn 0.8s ease-out;
}