/* ===================================
   So Happy Stretching - Landing Page
   Mobile-First Design
   =================================== */

:root {
    /* App Color Palette */
    --color-primary: #E2C960;
    --color-primary-light: #FCF6DA;
    --color-primary-medium: #FFF4C1;
    --color-text-dark: #2D2D2D;
    --color-text-medium: #6B6B6B;
    --color-text-light: #9B9B9B;
    --color-white: #FFFFFF;
    --color-background: #FAFAFA;
    --color-error: #E13B45;

    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;
    --spacing-3xl: 64px;

    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.12);
    --shadow-primary: 0 4px 20px rgba(226, 201, 96, 0.4);

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
}

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

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

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

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

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

/* Container */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* ===================================
   Buttons
   =================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: 14px;
    font-weight: 600;
    border-radius: var(--radius-xl);
    border: none;
    cursor: pointer;
    transition: all var(--transition-normal);
    white-space: nowrap;
}

.btn-primary {
    background: var(--color-primary);
    color: var(--color-text-dark);
    box-shadow: var(--shadow-primary);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 24px rgba(226, 201, 96, 0.5);
}

.btn-secondary {
    background: var(--color-white);
    color: var(--color-text-dark);
    border: 2px solid var(--color-text-dark);
}

.btn-secondary:hover {
    background: var(--color-text-dark);
    color: var(--color-white);
}

.btn-large {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 16px;
}

.apple-icon {
    width: 20px;
    height: 20px;
}

/* ===================================
   Header
   =================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.logo-icon {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
}

.logo-text {
    font-size: 16px;
    font-weight: 700;
    color: var(--color-text-dark);
    display: none;
}

.btn-download {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 13px;
}

/* ===================================
   Hero Section
   =================================== */
.hero {
    position: relative;
    padding: 100px 0 var(--spacing-3xl);
    background: linear-gradient(180deg, var(--color-primary-light) 0%, var(--color-white) 100%);
    overflow: hidden;
}

.hero .container {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.hero-content {
    max-width: 600px;
    margin-bottom: var(--spacing-2xl);
}

.hero-badge {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-md);
    background: var(--color-primary);
    color: var(--color-text-dark);
    font-size: 12px;
    font-weight: 600;
    border-radius: var(--radius-full);
    margin-bottom: var(--spacing-md);
}

.hero-title {
    font-size: 32px;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    color: var(--color-text-dark);
}

.hero-subtitle {
    font-size: 16px;
    color: var(--color-text-medium);
    margin-bottom: var(--spacing-lg);
}

.hero-buttons {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: var(--spacing-xl);
}

.stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 24px;
    font-weight: 800;
    color: var(--color-primary);
}

.stat-label {
    font-size: 12px;
    color: var(--color-text-medium);
}

/* Phone Frame */
.hero-phone {
    position: relative;
    width: 100%;
    max-width: 280px;
}

.phone-frame {
    position: relative;
    background: #1a1a1a;
    border-radius: 40px;
    padding: 12px;
    box-shadow: var(--shadow-lg), 0 0 0 1px rgba(255,255,255,0.1) inset;
}

.phone-frame::before {
    content: '';
    position: absolute;
    top: 12px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 24px;
    background: #1a1a1a;
    border-radius: 0 0 16px 16px;
    z-index: 10;
}

.phone-screen {
    position: relative;
    background: var(--color-white);
    border-radius: 32px;
    overflow: hidden;
    aspect-ratio: 9/19.5;
}

.screen-content {
    padding: var(--spacing-md);
    height: 100%;
}

/* Mock Screen Content */
.mock-header {
    display: flex;
    justify-content: center;
    padding-bottom: var(--spacing-sm);
}

.mock-time {
    font-size: 12px;
    font-weight: 600;
    color: var(--color-text-dark);
}

.mock-hero {
    padding: var(--spacing-lg) 0;
}

.mock-greeting {
    font-size: 12px;
    color: var(--color-text-medium);
    margin-bottom: var(--spacing-xs);
}

.mock-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--color-text-dark);
    line-height: 1.3;
}

.mock-card {
    background: var(--color-primary-light);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.mock-card-badge {
    display: inline-block;
    font-size: 10px;
    font-weight: 600;
    color: var(--color-primary);
    background: var(--color-primary-medium);
    padding: 2px 8px;
    border-radius: var(--radius-full);
    margin-bottom: var(--spacing-sm);
}

.mock-card-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--color-text-dark);
    margin-bottom: var(--spacing-xs);
}

.mock-card-info {
    font-size: 11px;
    color: var(--color-text-medium);
}

.mock-progress {
    background: var(--color-background);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
}

.mock-progress-title {
    font-size: 12px;
    font-weight: 600;
    color: var(--color-text-dark);
    margin-bottom: var(--spacing-sm);
}

.mock-progress-bar {
    height: 6px;
    background: #E5E5E5;
    border-radius: var(--radius-full);
    overflow: hidden;
    margin-bottom: var(--spacing-xs);
}

.mock-progress-fill {
    height: 100%;
    width: 68%;
    background: var(--color-primary);
    border-radius: var(--radius-full);
}

.mock-progress-text {
    font-size: 10px;
    color: var(--color-text-medium);
}

/* ===================================
   Problem Section
   =================================== */
.problem {
    padding: var(--spacing-3xl) 0;
    background: var(--color-white);
}

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

.section-badge {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-md);
    background: var(--color-primary-light);
    color: var(--color-text-dark);
    font-size: 12px;
    font-weight: 600;
    border-radius: var(--radius-full);
    margin-bottom: var(--spacing-md);
}

.section-title {
    font-size: 28px;
    font-weight: 800;
    color: var(--color-text-dark);
    margin-bottom: var(--spacing-md);
}

.section-subtitle {
    font-size: 16px;
    color: var(--color-text-medium);
}

.problem-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
}

.problem-card {
    background: var(--color-background);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    text-align: center;
}

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

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

.problem-card h3 {
    font-size: 16px;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-dark);
}

.problem-card p {
    font-size: 14px;
    color: var(--color-text-medium);
}

/* ===================================
   Features Section
   =================================== */
.features {
    padding: var(--spacing-3xl) 0;
    background: var(--color-primary-light);
}

.feature-block {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-3xl);
}

.feature-block:last-child {
    margin-bottom: 0;
}

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

.feature-badge {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-md);
    background: var(--color-primary);
    color: var(--color-text-dark);
    font-size: 12px;
    font-weight: 600;
    border-radius: var(--radius-full);
    margin-bottom: var(--spacing-md);
}

.feature-title {
    font-size: 24px;
    font-weight: 800;
    color: var(--color-text-dark);
    margin-bottom: var(--spacing-md);
}

.feature-description {
    font-size: 15px;
    color: var(--color-text-medium);
    margin-bottom: var(--spacing-lg);
}

.feature-list {
    list-style: none;
    text-align: left;
    max-width: 300px;
    margin: 0 auto;
}

.feature-list li {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 14px;
    color: var(--color-text-dark);
    margin-bottom: var(--spacing-sm);
}

.feature-list svg {
    width: 20px;
    height: 20px;
    color: var(--color-primary);
    flex-shrink: 0;
}

.feature-phone {
    width: 100%;
    max-width: 240px;
}

.phone-frame-small {
    border-radius: 32px;
    padding: 10px;
}

.phone-frame-small::before {
    width: 60px;
    height: 20px;
    top: 10px;
}

.phone-frame-small .phone-screen {
    border-radius: 24px;
}

/* AI Screen Mock */
.screen-ai {
    background: linear-gradient(180deg, #F5F5F5 0%, #FFFFFF 100%);
    display: flex;
    flex-direction: column;
}

.mock-ai-title {
    font-size: 16px;
    font-weight: 700;
    text-align: center;
    margin: var(--spacing-md) 0;
    color: var(--color-text-dark);
}

.mock-ai-body {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md);
}

.mock-ai-silhouette {
    width: 100px;
    height: 120px;
}

.mock-ai-silhouette svg {
    width: 100%;
    height: 100%;
}

.mock-ai-result {
    text-align: center;
    padding: var(--spacing-md);
    background: var(--color-primary-light);
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.mock-ai-score {
    font-size: 32px;
    font-weight: 800;
    color: var(--color-primary);
}

.mock-ai-label {
    font-size: 12px;
    color: var(--color-text-medium);
}

/* Video Screen Mock */
.screen-video {
    background: #1a1a1a;
    padding: 0;
}

.mock-video-player {
    position: relative;
    aspect-ratio: 16/10;
    background: linear-gradient(135deg, #FFE5B4 0%, #FFC864 100%);
    display: flex;
    align-items: center;
    justify-content: center;
}

.mock-video-overlay {
    width: 48px;
    height: 48px;
    background: rgba(0,0,0,0.5);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.mock-video-overlay svg {
    width: 24px;
    height: 24px;
    margin-left: 4px;
}

.mock-video-info {
    padding: var(--spacing-md);
    background: var(--color-white);
}

.mock-video-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--color-text-dark);
    margin-bottom: var(--spacing-xs);
}

.mock-video-meta {
    display: flex;
    gap: var(--spacing-sm);
    font-size: 11px;
    color: var(--color-text-medium);
}

.mock-video-progress {
    padding: var(--spacing-md);
    background: var(--color-white);
}

.mock-video-progress-bar {
    height: 4px;
    background: #E5E5E5;
    border-radius: var(--radius-full);
    margin-bottom: var(--spacing-xs);
}

.mock-video-progress-fill {
    height: 100%;
    width: 42%;
    background: var(--color-primary);
    border-radius: var(--radius-full);
}

.mock-video-time {
    font-size: 10px;
    color: var(--color-text-medium);
}

/* Progress Screen Mock */
.screen-progress {
    background: var(--color-white);
}

.mock-stats-title {
    font-size: 16px;
    font-weight: 700;
    color: var(--color-text-dark);
    margin: var(--spacing-md) 0;
}

.mock-stats-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.mock-stat-card {
    background: var(--color-primary-light);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    text-align: center;
}

.mock-stat-value {
    font-size: 20px;
    font-weight: 800;
    color: var(--color-primary);
}

.mock-stat-label {
    font-size: 10px;
    color: var(--color-text-medium);
}

.mock-chart {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    height: 80px;
    padding: var(--spacing-sm);
    background: var(--color-background);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-xs);
}

.mock-chart-bar {
    width: 12%;
    background: var(--color-primary-medium);
    border-radius: 4px 4px 0 0;
    transition: all var(--transition-normal);
}

.mock-chart-bar.active {
    background: var(--color-primary);
}

.mock-chart-labels {
    display: flex;
    justify-content: space-between;
    font-size: 8px;
    color: var(--color-text-light);
}

/* ===================================
   Audience Section
   =================================== */
.audience {
    padding: var(--spacing-3xl) 0;
    background: var(--color-white);
}

.audience-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
}

.audience-card {
    background: var(--color-background);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    text-align: center;
    transition: all var(--transition-normal);
}

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

.audience-emoji {
    font-size: 40px;
    margin-bottom: var(--spacing-md);
}

.audience-card h3 {
    font-size: 16px;
    font-weight: 700;
    color: var(--color-text-dark);
    margin-bottom: var(--spacing-sm);
}

.audience-card p {
    font-size: 14px;
    color: var(--color-text-medium);
}

/* ===================================
   Testimonials Section
   =================================== */
.testimonials {
    padding: var(--spacing-3xl) 0;
    background: var(--color-primary-light);
}

.testimonials-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
}

.testimonial-card {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
}

.testimonial-stars {
    color: var(--color-primary);
    font-size: 16px;
    margin-bottom: var(--spacing-md);
    letter-spacing: 2px;
}

.testimonial-text {
    font-size: 15px;
    color: var(--color-text-dark);
    margin-bottom: var(--spacing-lg);
    font-style: italic;
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.testimonial-avatar {
    width: 40px;
    height: 40px;
    background: var(--color-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    color: var(--color-text-dark);
}

.testimonial-name {
    font-size: 14px;
    font-weight: 600;
    color: var(--color-text-dark);
}

.testimonial-role {
    font-size: 12px;
    color: var(--color-text-medium);
}

/* ===================================
   CTA Section
   =================================== */
.cta {
    padding: var(--spacing-3xl) 0;
    background: var(--color-text-dark);
}

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

.cta-title {
    font-size: 28px;
    font-weight: 800;
    color: var(--color-white);
    margin-bottom: var(--spacing-md);
}

.cta-subtitle {
    font-size: 16px;
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: var(--spacing-xl);
}

.cta .btn-primary {
    margin-bottom: var(--spacing-md);
}

.cta-note {
    font-size: 12px;
    color: rgba(255, 255, 255, 0.5);
}

/* ===================================
   Footer
   =================================== */
.footer {
    padding: var(--spacing-xl) 0;
    background: #1a1a1a;
}

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

.footer-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.footer-logo {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-sm);
}

.footer-name {
    font-size: 14px;
    font-weight: 600;
    color: var(--color-white);
}

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

.footer-links a {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.6);
    transition: color var(--transition-fast);
}

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

.footer-copyright {
    font-size: 12px;
    color: rgba(255, 255, 255, 0.4);
}

/* ===================================
   Tablet Styles (min-width: 640px)
   =================================== */
@media (min-width: 640px) {
    .container {
        padding: 0 var(--spacing-lg);
    }

    .logo-text {
        display: block;
    }

    .hero-title {
        font-size: 40px;
    }

    .hero-buttons {
        flex-direction: row;
        justify-content: center;
    }

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

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

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

/* ===================================
   Desktop Styles (min-width: 1024px)
   =================================== */
@media (min-width: 1024px) {
    .nav {
        height: 80px;
    }

    .logo-icon {
        width: 48px;
        height: 48px;
    }

    .logo-text {
        font-size: 18px;
    }

    .btn-download {
        padding: var(--spacing-md) var(--spacing-lg);
        font-size: 14px;
    }

    .hero {
        padding: 140px 0 var(--spacing-3xl);
    }

    .hero .container {
        flex-direction: row;
        justify-content: space-between;
        text-align: left;
    }

    .hero-content {
        flex: 1;
        max-width: 550px;
        margin-bottom: 0;
    }

    .hero-title {
        font-size: 52px;
    }

    .hero-subtitle {
        font-size: 18px;
    }

    .hero-buttons {
        justify-content: flex-start;
    }

    .hero-stats {
        justify-content: flex-start;
    }

    .hero-phone {
        flex-shrink: 0;
    }

    .section-title {
        font-size: 36px;
    }

    .problem-grid {
        grid-template-columns: repeat(4, 1fr);
    }

    .feature-block {
        flex-direction: row;
        text-align: left;
        gap: var(--spacing-3xl);
    }

    .feature-block.reverse {
        flex-direction: row-reverse;
    }

    .feature-content {
        flex: 1;
        text-align: left;
    }

    .feature-title {
        font-size: 32px;
    }

    .feature-list {
        margin: 0;
        max-width: none;
    }

    .feature-phone {
        flex-shrink: 0;
        max-width: 280px;
    }

    .audience-grid {
        grid-template-columns: repeat(3, 1fr);
    }

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

    .cta-title {
        font-size: 40px;
    }

    .footer-content {
        flex-direction: row;
        justify-content: space-between;
    }
}

/* ===================================
   Animations
   =================================== */
@keyframes float {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-10px);
    }
}

.hero-phone {
    animation: float 4s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.7;
    }
}

.mock-progress-fill,
.mock-video-progress-fill {
    animation: pulse 2s ease-in-out infinite;
}

/* Scroll reveal animation classes */
.reveal {
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.6s ease;
}

.reveal.active {
    opacity: 1;
    transform: translateY(0);
}