/* ============================
   CSS Variables & Base Styles
   ============================ */

:root {
    /* Colors from ThemeManager */
    --primary: #894fa3;
    --primary-light: #a66dbf;
    --primary-dark: #6e3f82;

    --background: #ffffff;
    --background-secondary: #f5f5f7;
    --text: #1d1d1f;
    --text-secondary: #6e6e73;

    --card-background: rgba(255, 255, 255, 0.7);
    --card-border: rgba(255, 255, 255, 0.3);

    --success: #34c759;
    --warning: #ff9500;

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

    /* Border radius */
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-xl: 32px;

    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.12);

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

    /* Container */
    --container-max: 1200px;
    --container-padding: 1.5rem;
}

/* Dark mode */
@media (prefers-color-scheme: dark) {
    :root {
        --background: #1c1c1e;
        --background-secondary: #2c2c2e;
        --text: #ffffff;
        --text-secondary: #98989d;

        --card-background: rgba(44, 44, 46, 0.7);
        --card-border: rgba(255, 255, 255, 0.1);

        --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
        --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.3);
        --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.4);
    }
}

/* Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--text);
    background-color: var(--background);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

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

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

ul {
    list-style: none;
}

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

/* ============================
   Navigation
   ============================ */

.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: var(--spacing-sm) 0;
    transition: background-color var(--transition-normal), backdrop-filter var(--transition-normal);
}

.nav.scrolled {
    background-color: var(--card-background);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--card-border);
}

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

.nav-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-weight: 600;
    font-size: 1.25rem;
}

.nav-logo-icon {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-sm);
}

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

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

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

.nav-cta {
    background: var(--primary);
    color: white;
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-lg);
    font-weight: 600;
    font-size: 0.9375rem;
    transition: background-color var(--transition-fast), transform var(--transition-fast);
}

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

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: var(--spacing-xs);
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text);
    border-radius: 2px;
    transition: transform var(--transition-fast), opacity var(--transition-fast);
}

/* Mobile Navigation */
@media (max-width: 768px) {
    .nav-toggle {
        display: flex;
    }

    .nav-links {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        flex-direction: column;
        background: var(--card-background);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        padding: var(--spacing-md);
        gap: var(--spacing-sm);
        opacity: 0;
        visibility: hidden;
        transform: translateY(-10px);
        transition: all var(--transition-normal);
        border-bottom: 1px solid var(--card-border);
    }

    .nav-links.active {
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
    }

    .nav-cta {
        display: none;
    }

    .nav-toggle.active span:nth-child(1) {
        transform: translateY(7px) rotate(45deg);
    }

    .nav-toggle.active span:nth-child(2) {
        opacity: 0;
    }

    .nav-toggle.active span:nth-child(3) {
        transform: translateY(-7px) rotate(-45deg);
    }
}

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

.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: calc(80px + var(--spacing-2xl)) 0 var(--spacing-3xl);
    overflow: hidden;
}

.hero-aurora {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(ellipse 80% 50% at 20% 40%, rgba(137, 79, 163, 0.3) 0%, transparent 50%),
        radial-gradient(ellipse 60% 40% at 80% 60%, rgba(166, 109, 191, 0.2) 0%, transparent 50%),
        radial-gradient(ellipse 50% 30% at 40% 80%, rgba(110, 63, 130, 0.15) 0%, transparent 50%);
    animation: aurora 20s ease-in-out infinite;
    pointer-events: none;
}

@keyframes aurora {
    0%, 100% {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
    25% {
        opacity: 0.8;
        transform: scale(1.05) translateY(-20px);
    }
    50% {
        opacity: 1;
        transform: scale(1.1) translateY(-10px);
    }
    75% {
        opacity: 0.9;
        transform: scale(1.02) translateY(-30px);
    }
}

.hero-content {
    position: relative;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
    align-items: center;
}

.hero-text {
    max-width: 560px;
}

.hero-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 700;
    line-height: 1.1;
    letter-spacing: -0.02em;
    margin-bottom: var(--spacing-md);
    background: linear-gradient(135deg, var(--text) 0%, var(--primary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-tagline {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.5;
}

.hero-value {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-sm);
    background: var(--card-background);
    border-radius: var(--radius-md);
    border: 1px solid var(--card-border);
}

.app-store-badge img {
    height: 54px;
    transition: transform var(--transition-fast);
}

.app-store-badge:hover img {
    transform: scale(1.05);
}

.beta-button {
    display: inline-block;
    background: var(--primary);
    color: white;
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-lg);
    font-size: 1.125rem;
    font-weight: 600;
    transition: background-color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
    box-shadow: 0 4px 14px rgba(137, 79, 163, 0.4);
}

.beta-button:hover {
    background: var(--primary-light);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(137, 79, 163, 0.5);
}

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

.footer-cta .beta-button:hover {
    background: rgba(255, 255, 255, 0.9);
    color: var(--primary-dark);
}

.hero-mockup {
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-mockup img {
    max-height: 600px;
    width: auto;
    filter: drop-shadow(0 20px 40px rgba(0, 0, 0, 0.2));
    animation: float 6s ease-in-out infinite;
}

@keyframes float {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-20px);
    }
}

@media (max-width: 1024px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-text {
        max-width: 100%;
    }

    .hero-mockup img {
        max-height: 400px;
    }
}

@media (max-width: 640px) {
    .hero {
        padding-top: calc(70px + var(--spacing-xl));
    }

    .hero-mockup {
        display: none;
    }
}

/* ============================
   Section Headers
   ============================ */

.section-header {
    text-align: center;
    max-width: 600px;
    margin: 0 auto var(--spacing-2xl);
}

.section-header h2 {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    letter-spacing: -0.01em;
}

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

/* ============================
   Problem/Solution Section
   ============================ */

.problem-solution {
    padding: var(--spacing-3xl) 0;
    background: var(--background-secondary);
}

.comparison-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
    max-width: 900px;
    margin: 0 auto;
}

.comparison-card {
    background: var(--card-background);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
}

.comparison-icon {
    width: 48px;
    height: 48px;
    margin-bottom: var(--spacing-md);
}

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

.comparison-card.problem .comparison-icon {
    color: var(--warning);
}

.comparison-card.solution .comparison-icon {
    color: var(--success);
}

.comparison-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

.comparison-card ul {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.comparison-card li {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-xs);
    color: var(--text-secondary);
}

.comparison-card li::before {
    content: '';
    width: 6px;
    height: 6px;
    border-radius: 50%;
    margin-top: 0.5em;
    flex-shrink: 0;
}

.comparison-card.problem li::before {
    background: var(--warning);
}

.comparison-card.solution li::before {
    background: var(--success);
}

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

/* ============================
   Features Section
   ============================ */

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

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
}

.feature-card {
    background: var(--card-background);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

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

.feature-icon {
    width: 48px;
    height: 48px;
    margin-bottom: var(--spacing-md);
    color: var(--primary);
}

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

.feature-card h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.feature-card p {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

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

@media (max-width: 640px) {
    .features-grid {
        grid-template-columns: 1fr;
    }
}

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

.how-it-works {
    padding: var(--spacing-3xl) 0;
    background: var(--background-secondary);
}

.steps {
    display: flex;
    gap: var(--spacing-lg);
    max-width: 1000px;
    margin: 0 auto;
}

.step {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    position: relative;
}

.step:not(:last-child)::after {
    content: '';
    position: absolute;
    top: 40px;
    right: -20%;
    width: 40%;
    height: 2px;
    background: linear-gradient(90deg, var(--primary), var(--primary-light));
    opacity: 0.3;
}

.step-number {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: white;
    font-size: 2rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-md);
    box-shadow: 0 8px 24px rgba(137, 79, 163, 0.3);
}

.step-content h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.step-content p {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    max-width: 280px;
}

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

    .step:not(:last-child)::after {
        display: none;
    }

    .step {
        max-width: 400px;
    }
}

/* ============================
   Verification Section
   ============================ */

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

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

.verification-card {
    background: var(--card-background);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-sm);
    text-align: center;
    position: relative;
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

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

.verification-icon {
    width: 56px;
    height: 56px;
    margin: 0 auto var(--spacing-md);
    color: var(--primary);
}

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

.verification-card h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.verification-card p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

.verification-badge {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    background: var(--primary);
    color: white;
    font-size: 0.6875rem;
    font-weight: 600;
    padding: 4px 8px;
    border-radius: var(--radius-sm);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

@media (max-width: 1024px) {
    .verification-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 640px) {
    .verification-grid {
        grid-template-columns: 1fr;
    }
}

.section-intro {
    text-align: center;
    max-width: 700px;
    margin: calc(-1 * var(--spacing-lg)) auto var(--spacing-2xl);
    font-size: 1.0625rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ============================
   Why Anchors Work Section
   ============================ */

.why-anchors {
    padding: var(--spacing-3xl) 0;
    background: var(--background-secondary);
}

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

.why-anchors-content p {
    font-size: 1.125rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: var(--spacing-md);
}

.why-anchors-content p:first-child {
    font-size: 1.375rem;
    color: var(--text);
    font-weight: 500;
}

.why-anchors-content .supportive-note {
    margin-top: var(--spacing-xl);
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--card-background);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-style: italic;
    color: var(--text-secondary);
}

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

.faq {
    padding: var(--spacing-3xl) 0;
    background: var(--background-secondary);
}

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

.faq-item {
    background: var(--card-background);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.faq-question {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: 1rem;
    font-weight: 600;
    text-align: left;
    color: var(--text);
    transition: color var(--transition-fast);
}

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

.faq-question svg {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
    transition: transform var(--transition-normal);
}

.faq-item.active .faq-question svg {
    transform: rotate(180deg);
}

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

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

.faq-answer p {
    padding: 0 var(--spacing-lg) var(--spacing-md);
    color: var(--text-secondary);
    font-size: 0.9375rem;
    line-height: 1.6;
}

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

.footer {
    padding: var(--spacing-3xl) 0 var(--spacing-xl);
    background: var(--background);
}

.footer-cta {
    text-align: center;
    padding: var(--spacing-2xl);
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    border-radius: var(--radius-xl);
    margin-bottom: var(--spacing-2xl);
    color: white;
}

.footer-cta h2 {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
}

.footer-cta p {
    opacity: 0.9;
    margin-bottom: var(--spacing-lg);
}

.footer-cta .app-store-badge img {
    margin: 0 auto;
    filter: brightness(0) invert(1);
}

.footer-links {
    display: grid;
    grid-template-columns: 2fr repeat(3, 1fr);
    gap: var(--spacing-xl);
    padding-bottom: var(--spacing-xl);
    border-bottom: 1px solid var(--card-border);
}

.footer-brand {
    max-width: 200px;
}

.footer-logo {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-sm);
    margin-bottom: var(--spacing-sm);
}

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

.footer-nav h4 {
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: var(--spacing-md);
    color: var(--text-secondary);
}

.footer-nav a {
    display: block;
    font-size: 0.9375rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
    transition: color var(--transition-fast);
}

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

.footer-bottom {
    padding-top: var(--spacing-lg);
    text-align: center;
}

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

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

    .footer-brand {
        grid-column: span 2;
        max-width: 100%;
        text-align: center;
        margin-bottom: var(--spacing-md);
    }

    .footer-logo {
        margin: 0 auto var(--spacing-sm);
    }
}

@media (max-width: 480px) {
    .footer-links {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .footer-brand {
        grid-column: span 1;
    }

    .footer-nav {
        padding: var(--spacing-md) 0;
        border-top: 1px solid var(--card-border);
    }
}

/* ============================
   Animations
   ============================ */

.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* Stagger children animations */
.features-grid .feature-card:nth-child(1) { transition-delay: 0s; }
.features-grid .feature-card:nth-child(2) { transition-delay: 0.1s; }
.features-grid .feature-card:nth-child(3) { transition-delay: 0.2s; }
.features-grid .feature-card:nth-child(4) { transition-delay: 0.3s; }
.features-grid .feature-card:nth-child(5) { transition-delay: 0.4s; }
.features-grid .feature-card:nth-child(6) { transition-delay: 0.5s; }

.verification-grid .verification-card:nth-child(1) { transition-delay: 0s; }
.verification-grid .verification-card:nth-child(2) { transition-delay: 0.1s; }
.verification-grid .verification-card:nth-child(3) { transition-delay: 0.2s; }
.verification-grid .verification-card:nth-child(4) { transition-delay: 0.3s; }

/* ============================
   Utility Classes
   ============================ */

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}