/* ============================================================================
   AI FOOD COACH LANDING PAGE - MAIN STYLES
   Apple-inspired dark theme with glassmorphism (green color scheme)
   ============================================================================ */

/* === CSS VARIABLES === */
:root {
    /* Colors - Brand (Green) */
    --gradient-primary: linear-gradient(135deg, #2E7D32 0%, #4CAF50 50%, #66BB6A 100%);
    --gradient-hero: linear-gradient(180deg, #000000 0%, #0a1f0a 50%, #0d2818 100%);
    --gradient-card: linear-gradient(135deg, rgba(46, 125, 50, 0.1) 0%, rgba(76, 175, 80, 0.1) 100%);

    /* Plan Colors */
    --color-free: #4CAF50;
    --color-premium: #FFB300;

    /* Dark Theme */
    --color-bg-primary: #000000;
    --color-bg-secondary: #0a0a0a;
    --color-bg-tertiary: #1a1a1a;
    --color-bg-card: rgba(255, 255, 255, 0.05);
    --color-bg-card-hover: rgba(255, 255, 255, 0.08);

    /* Text */
    --color-text-primary: #ffffff;
    --color-text-secondary: rgba(255, 255, 255, 0.7);
    --color-text-tertiary: rgba(255, 255, 255, 0.5);

    /* Borders & Accents */
    --color-border: rgba(255, 255, 255, 0.1);
    --color-border-hover: rgba(255, 255, 255, 0.2);
    --color-accent-green: #4CAF50;
    --color-accent-dark-green: #2E7D32;

    /* Typography */
    --font-primary: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI",
                    Roboto, Helvetica, Arial, sans-serif;

    /* Type Scale */
    --text-hero: clamp(48px, 8vw, 72px);
    --text-h1: clamp(40px, 6vw, 56px);
    --text-h2: clamp(32px, 5vw, 40px);
    --text-h3: clamp(24px, 4vw, 32px);
    --text-body-lg: 20px;
    --text-body: 17px;
    --text-small: 15px;
    --text-caption: 13px;

    /* Spacing */
    --spacing-xs: 8px;
    --spacing-sm: 16px;
    --spacing-md: 24px;
    --spacing-lg: 40px;
    --spacing-xl: 64px;
    --spacing-2xl: 96px;
    --spacing-3xl: 128px;

    /* Layout */
    --container-max: 1200px;
    --container-padding: 24px;
    --section-padding-y: clamp(60px, 10vw, 120px);

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

    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.3);
    --shadow-glow: 0 0 60px rgba(76, 175, 80, 0.3);

    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 300ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* === BASE RESET === */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    overflow-x: hidden;
}

body {
    font-family: var(--font-primary);
    font-size: var(--text-body);
    line-height: 1.6;
    color: var(--color-text-primary);
    background: var(--color-bg-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

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

/* === SECTIONS === */
.section {
    padding: var(--section-padding-y) 0;
    position: relative;
    overflow: hidden;
}

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

.section-title {
    font-size: var(--text-h1);
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: var(--spacing-sm);
}

.section-subtitle {
    font-size: var(--text-body-lg);
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* === NAVIGATION === */
.nav-main {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 16px 0;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid var(--color-border);
    transition: all var(--transition-normal);
}

.nav-main.scrolled {
    padding: 12px 0;
    background: rgba(0, 0, 0, 0.95);
}

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

.nav-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: var(--color-text-primary);
    font-size: 20px;
    font-weight: 600;
}

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

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

.nav-link {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: var(--text-body);
    font-weight: 500;
    transition: color var(--transition-fast);
}

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

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

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

/* Language Switcher */
.nav-lang {
    display: flex;
    gap: 2px;
    background: var(--color-bg-card);
    border-radius: var(--radius-sm);
    padding: 3px;
    border: 1px solid var(--color-border);
}

.lang-btn {
    padding: 5px 10px;
    background: transparent;
    border: none;
    border-radius: 4px;
    color: var(--color-text-tertiary);
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    letter-spacing: 0.5px;
}

.lang-btn.active {
    background: var(--gradient-primary);
    color: var(--color-text-primary);
    box-shadow: 0 2px 8px rgba(76, 175, 80, 0.3);
}

.lang-btn:hover:not(.active) {
    color: var(--color-text-primary);
    background: rgba(255, 255, 255, 0.05);
}

/* Watch Nav Link */
.nav-mobile-only {
    display: none;
}

.nav-link-watch {
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

svg.nav-watch-icon {
    flex-shrink: 0;
    vertical-align: middle;
}

.btn-appstore-nav {
    padding: 8px 16px;
    font-size: var(--text-small);
    background: var(--gradient-primary);
    color: var(--color-text-primary);
    text-decoration: none;
    border-radius: var(--radius-sm);
    font-weight: 600;
    transition: all var(--transition-fast);
}

.btn-appstore-nav:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 16px rgba(76, 175, 80, 0.3);
}

.btn-appstore-mobile {
    display: none;
}

.nav-store-badges {
    display: none;
}

/* === HERO SECTION === */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    padding-top: calc(var(--section-padding-y) + 80px);
}

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

.hero-title {
    font-size: var(--text-hero);
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: var(--spacing-md);
}

.gradient-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: var(--text-body-lg);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-lg);
}

.hero-cta {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

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

.hero-store-badges img {
    height: 56px;
    width: auto;
    transition: opacity var(--transition-fast);
}

.hero-store-badges a:hover img {
    opacity: 0.8;
}

.hero-note {
    font-size: var(--text-small);
    color: var(--color-text-tertiary);
}

.hero-visual {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-image {
    width: 100%;
    max-width: 450px;
    height: auto;
    border-radius: 48px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5),
                0 0 40px rgba(76, 175, 80, 0.3);
    position: relative;
    z-index: 2;
}

.hero-image-placeholder {
    width: 100%;
    max-width: 400px;
    aspect-ratio: 9/19;
    background: var(--gradient-card);
    border: 2px dashed var(--color-border);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    z-index: 2;
}

.placeholder-text {
    text-align: center;
    color: var(--color-text-tertiary);
    font-size: var(--text-small);
}

.hero-glow {
    position: absolute;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(76, 175, 80, 0.4) 0%, transparent 70%);
    filter: blur(60px);
    z-index: 1;
}

.hero-bg-gradient {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--gradient-hero);
    opacity: 0.6;
    z-index: -1;
}

/* === BUTTONS === */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    font-size: var(--text-body);
    font-weight: 600;
    text-decoration: none;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: all var(--transition-normal);
}

.btn-lg {
    padding: 16px 32px;
    font-size: var(--text-body-lg);
}

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

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 80px rgba(76, 175, 80, 0.5);
}

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

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

/* === GLASS CARDS === */
.glass-card {
    background: var(--color-bg-card);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    transition: all var(--transition-normal);
}

.glass-card:hover {
    background: var(--color-bg-card-hover);
    border-color: var(--color-border-hover);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

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

.feature-icon {
    width: 64px;
    height: 64px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-md);
}

.gradient-icon {
    background: var(--gradient-card);
    border: 1px solid var(--color-border);
}

.feature-icon svg {
    width: 32px;
    height: 32px;
    stroke: var(--color-accent-green);
}

.feature-title {
    font-size: var(--text-h3);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.feature-description {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
}

.feature-image-wrapper {
    border-radius: var(--radius-md);
    overflow: hidden;
    margin-top: var(--spacing-md);
}

.feature-image {
    width: 100%;
    height: auto;
    border-radius: var(--radius-md);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
}

.placeholder-box {
    background: var(--gradient-card);
    border: 2px dashed var(--color-border);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
    color: var(--color-text-tertiary);
    font-size: var(--text-small);
    text-align: center;
    position: relative;
    overflow: hidden;
}

/* === PRICING SECTION === */
.pricing {
    background: radial-gradient(circle at center, rgba(46, 125, 50, 0.1) 0%, transparent 70%);
}

/* Pricing Toggle (Monthly/Yearly) */
.pricing-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xl);
}

.pricing-toggle-label {
    font-size: var(--text-body);
    color: var(--color-text-secondary);
    font-weight: 500;
    cursor: pointer;
    transition: color var(--transition-fast);
}

.pricing-toggle-label.active {
    color: var(--color-text-primary);
}

.pricing-toggle-switch {
    position: relative;
    width: 52px;
    height: 28px;
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: 14px;
    cursor: pointer;
    transition: background var(--transition-fast);
}

.pricing-toggle-switch::after {
    content: '';
    position: absolute;
    top: 3px;
    left: 3px;
    width: 20px;
    height: 20px;
    background: var(--color-accent-green);
    border-radius: 50%;
    transition: transform var(--transition-fast);
}

.pricing-toggle-switch.yearly::after {
    transform: translateX(24px);
}

.pricing-save-badge {
    font-size: var(--text-caption);
    padding: 4px 10px;
    background: rgba(255, 179, 0, 0.2);
    color: var(--color-premium);
    border-radius: 100px;
    font-weight: 600;
}

/* Pricing Comparison Table */
.pricing-comparison {
    max-width: 800px;
    margin: 0 auto;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    background: var(--color-bg-card);
    backdrop-filter: blur(20px);
}

.pricing-comparison-header {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr;
    background: rgba(255, 255, 255, 0.03);
    border-bottom: 1px solid var(--color-border);
}

.pricing-comparison-header > div {
    padding: var(--spacing-md);
    text-align: center;
    font-weight: 600;
}

.pricing-comparison-header > div:first-child {
    text-align: left;
}

.pricing-plan-header {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.pricing-plan-name {
    font-size: var(--text-body-lg);
    font-weight: 700;
}

.pricing-plan-price {
    font-size: var(--text-h3);
    font-weight: 700;
}

.pricing-plan-price .period {
    font-size: var(--text-small);
    font-weight: 400;
    color: var(--color-text-secondary);
}

.pricing-plan-header.premium {
    color: var(--color-premium);
}

.pricing-comparison-row {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    transition: background var(--transition-fast);
}

.pricing-comparison-row:last-child {
    border-bottom: none;
}

.pricing-comparison-row:hover {
    background: rgba(255, 255, 255, 0.02);
}

.pricing-comparison-row > div {
    padding: var(--spacing-sm) var(--spacing-md);
    display: flex;
    align-items: center;
}

.pricing-comparison-row > div:first-child {
    color: var(--color-text-secondary);
    font-size: var(--text-small);
}

.pricing-comparison-row > div:not(:first-child) {
    justify-content: center;
}

.pricing-check {
    color: var(--color-accent-green);
}

.pricing-cross {
    color: var(--color-text-tertiary);
    opacity: 0.4;
}

.pricing-text {
    font-size: var(--text-small);
    color: var(--color-text-secondary);
}

.pricing-comparison-cta {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr;
    padding: var(--spacing-md);
    border-top: 1px solid var(--color-border);
    background: rgba(255, 255, 255, 0.02);
}

.pricing-comparison-cta > div {
    display: flex;
    justify-content: center;
    align-items: center;
}

.pricing-comparison-cta > div:first-child {
    /* empty spacer */
}

.pricing-also-android {
    text-align: center;
    font-size: var(--text-small);
    color: var(--color-text-tertiary);
    margin-top: var(--spacing-md);
}

.pricing-also-android a {
    color: var(--color-accent-green);
    text-decoration: none;
    font-weight: 500;
}

.pricing-also-android a:hover {
    text-decoration: underline;
}

.pricing-disclaimer {
    text-align: center;
    font-size: var(--text-small);
    color: var(--color-text-tertiary);
    margin-top: var(--spacing-sm);
    font-style: italic;
}

.pricing-footnote {
    text-align: center;
    font-size: var(--text-caption);
    color: var(--color-text-tertiary);
    margin-top: var(--spacing-xs);
}

.plans-cta {
    text-align: center;
    margin-top: var(--spacing-xl);
}

/* === HOW IT WORKS === */
.steps-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
}

.step {
    text-align: center;
}

.step-number {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--text-h3);
    font-weight: 700;
    margin: 0 auto var(--spacing-md);
}

.step-title {
    font-size: var(--text-h3);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.step-description {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
}

.step-image {
    width: 100%;
    max-width: 280px;
    height: auto;
    border-radius: var(--radius-lg);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.5);
    margin: 0 auto;
    display: block;
}

.step-image-placeholder {
    width: 100%;
    max-width: 280px;
    aspect-ratio: 4/5;
    margin: 0 auto;
}

/* === PRIVACY SECTION === */
.privacy-content {
    max-width: 900px;
    margin: 0 auto;
}

.privacy-features {
    list-style: none;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
    margin: var(--spacing-lg) 0;
}

.privacy-features li {
    display: flex;
    gap: var(--spacing-md);
}

.privacy-features svg {
    width: 32px;
    height: 32px;
    stroke: var(--color-accent-green);
    flex-shrink: 0;
}

.privacy-features strong {
    display: block;
    font-size: var(--text-body-lg);
    margin-bottom: var(--spacing-xs);
}

.privacy-features p {
    color: var(--color-text-secondary);
    font-size: var(--text-body);
}

.privacy-links {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    margin-top: var(--spacing-lg);
}

.link-arrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--color-accent-green);
    text-decoration: none;
    font-weight: 600;
    transition: gap var(--transition-fast);
}

.link-arrow:hover {
    gap: 12px;
}

.link-arrow::after {
    content: '\2192';
}

.how-science-note {
    text-align: center;
    color: var(--color-text-secondary);
    font-size: var(--text-body);
    max-width: 600px;
    margin: var(--spacing-xl) auto var(--spacing-sm);
}

/* === COMMUNITY SECTION === */
.community-card {
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
}

.community-icon {
    stroke: var(--color-accent-green);
    margin-bottom: var(--spacing-md);
}

.off-count {
    font-size: clamp(2.5rem, 5vw, 3.5rem);
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.2;
}

.off-count-label {
    font-size: var(--text-body);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
}

.community-card .section-subtitle {
    margin-bottom: var(--spacing-md);
}

.community-link-wrap {
    margin-top: var(--spacing-sm);
}

/* === FAQ SECTION === */
.faq-section {
    max-width: 800px;
    margin: 0 auto;
}

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

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

.faq-item summary {
    padding: var(--spacing-md);
    cursor: pointer;
    font-weight: 600;
    font-size: var(--text-body-lg);
    list-style: none;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-sm);
    transition: background var(--transition-fast);
}

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

.faq-item summary::after {
    content: '+';
    font-size: 24px;
    color: var(--color-accent-green);
    flex-shrink: 0;
    transition: transform var(--transition-fast);
}

.faq-item[open] summary::after {
    content: '\2212';
}

.faq-item summary:hover {
    background: rgba(255, 255, 255, 0.02);
}

.faq-answer {
    padding: 0 var(--spacing-md) var(--spacing-md);
    color: var(--color-text-secondary);
    line-height: 1.8;
}

/* === FOOTER === */
.footer {
    padding: var(--spacing-xl) 0 var(--spacing-lg);
    border-top: 1px solid var(--color-border);
    background: var(--color-bg-secondary);
}

.footer-content {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1fr;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.footer-brand {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

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

.footer-tagline {
    color: var(--color-text-secondary);
    font-size: var(--text-small);
}

.footer-col h4 {
    font-size: var(--text-body);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.footer-col a {
    display: block;
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: var(--text-small);
    margin-bottom: var(--spacing-xs);
    transition: color var(--transition-fast);
}

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

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

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