/* ========================================
   CANT BALANCE - GRAYSCALE THEME
   Emberbright Studio Product Microsite
   ======================================== */

/* ========================================
   CSS RESET & BASE
   ======================================== */

*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* ========================================
   CSS CUSTOM PROPERTIES (DESIGN TOKENS)
   ======================================== */

:root {
    /* Colors - Light Mode (Grayscale) */
    --color-bg-primary: #FAFAFA;
    --color-bg-secondary: #F0F0F0;
    --color-bg-elevated: #FFFFFF;
    --color-bg-hero: #1A1A1A;

    --color-text-primary: #1A1A1A;
    --color-text-secondary: #666666;
    --color-text-muted: #999999;
    --color-text-inverse: #FAFAFA;

    --color-accent-primary: #333333;
    --color-accent-secondary: #555555;
    --color-accent-hover: #000000;

    --color-border: #E5E5E5;
    --color-border-hover: #CCCCCC;

    /* Typography */
    --font-serif: Georgia, 'Times New Roman', serif;
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica', 'Arial', sans-serif;
    --font-logo: 'Poppins', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'SF Mono', Monaco, 'Courier New', monospace;

    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;
    --font-size-6xl: 3.75rem;

    /* Spacing (8px grid) */
    --space-1: 0.5rem;
    --space-2: 1rem;
    --space-3: 1.5rem;
    --space-4: 2rem;
    --space-6: 3rem;
    --space-8: 4rem;
    --space-12: 6rem;
    --space-16: 8rem;

    /* Layout */
    --container-max: 1200px;
    --container-padding: 1.5rem;
    --nav-height: 80px;

    /* Borders */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 9999px;

    /* Shadows - Subtle for grayscale */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.08);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.10);

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

/* Dark Mode */
[data-theme="dark"] {
    --color-bg-primary: #1A1A1A;
    --color-bg-secondary: #242424;
    --color-bg-elevated: #2A2A2A;
    --color-bg-hero: #0D0D0D;

    --color-text-primary: #F5F5F5;
    --color-text-secondary: #A0A0A0;
    --color-text-muted: #666666;
    --color-text-inverse: #1A1A1A;

    --color-accent-primary: #FFFFFF;
    --color-accent-secondary: #CCCCCC;
    --color-accent-hover: #F0F0F0;

    --color-border: #333333;
    --color-border-hover: #444444;

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.4);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.5);
}

/* ========================================
   BASE STYLES
   ======================================== */

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

body {
    font-family: var(--font-sans);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-text-primary);
    background-color: var(--color-bg-primary);
    transition: background-color var(--transition-base), color var(--transition-base);
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-sans);
    line-height: 1.2;
    font-weight: 600;
    color: var(--color-text-primary);
}

a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

/* ========================================
   LAYOUT
   ======================================== */

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

/* ========================================
   NAVIGATION
   ======================================== */

.nav {
    position: sticky;
    top: 0;
    z-index: 100;
    background-color: var(--color-bg-elevated);
    border-bottom: 1px solid var(--color-border);
    transition: background-color var(--transition-base), border-color var(--transition-base);
}

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

.nav-logo {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.logo-image {
    height: 4rem;
    width: auto;
}

.logo-text {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    line-height: 1;
    font-family: var(--font-logo);
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text-primary);
    letter-spacing: -0.01em;
    text-transform: lowercase;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 40px;
    height: 40px;
    background: transparent;
    border: none;
    cursor: pointer;
    position: relative;
}

.nav-toggle-icon,
.nav-toggle-icon::before,
.nav-toggle-icon::after {
    width: 24px;
    height: 2px;
    background-color: var(--color-text-primary);
    transition: all var(--transition-base);
    position: absolute;
}

.nav-toggle-icon::before,
.nav-toggle-icon::after {
    content: '';
}

.nav-toggle-icon::before {
    transform: translateY(-7px);
}

.nav-toggle-icon::after {
    transform: translateY(7px);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-icon {
    background-color: transparent;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-icon::before {
    transform: rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-icon::after {
    transform: rotate(-45deg);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    list-style: none;
}

.nav-link {
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    font-weight: 500;
    letter-spacing: 0.02em;
    transition: color var(--transition-fast);
}

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

.theme-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: transparent;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

.theme-icon {
    font-size: var(--font-size-lg);
}

[data-theme="dark"] .theme-icon {
    color: #FFFFFF;
}

.nav-cta {
    padding: var(--space-2) var(--space-3);
    background-color: var(--color-accent-primary);
    color: var(--color-text-inverse);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    font-weight: 600;
    transition: all var(--transition-fast);
}

.nav-cta:hover {
    background-color: var(--color-accent-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

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

    .nav-menu {
        position: absolute;
        top: var(--nav-height);
        left: 0;
        right: 0;
        flex-direction: column;
        gap: 0;
        background-color: var(--color-bg-elevated);
        border-bottom: 1px solid var(--color-border);
        padding: var(--space-4) 0;
        opacity: 0;
        visibility: hidden;
        transform: translateY(-10px);
        transition: all var(--transition-base);
    }

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

    .nav-menu li {
        width: 100%;
        text-align: center;
        padding: var(--space-2) 0;
    }

    .nav-link {
        display: block;
        padding: var(--space-2);
    }
}

/* ========================================
   HERO SECTION
   ======================================== */

.hero {
    padding: var(--space-16) 0 var(--space-12);
    background-color: var(--color-bg-hero);
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.hero-logo-wrapper {
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: center;
    gap: var(--space-3);
    margin-bottom: var(--space-4);
}

.hero-logo {
    height: 140px;
    width: auto;
    filter: drop-shadow(0 4px 12px rgba(0, 0, 0, 0.15));
    transition: transform var(--transition-base);
}

.hero-logo:hover {
    transform: scale(1.02);
}

/* Product Icon */
.product-icon-large {
    width: 120px;
    height: 120px;
    border-radius: var(--radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--space-6);
    background: linear-gradient(135deg, #4A4A4A 0%, #2A2A2A 100%);
    box-shadow: var(--shadow-xl);
}

.product-emoji-large {
    font-size: 4rem;
}

.app-icon-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: var(--radius-xl);
}

.hero-title {
    font-size: var(--font-size-5xl);
    margin-bottom: var(--space-4);
    color: #FFFFFF;
    font-weight: 700;
}

.hero-tagline {
    font-size: var(--font-size-xl);
    color: #CCCCCC;
    margin-bottom: var(--space-6);
    line-height: 1.5;
}

.hero-actions {
    display: flex;
    gap: var(--space-3);
    justify-content: center;
    flex-wrap: wrap;
}

/* ========================================
   SCREENSHOT GALLERY
   ======================================== */

.screenshots {
    padding: var(--space-12) 0;
    background: var(--color-bg-secondary);
}

.screenshot-gallery {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-4);
    max-width: 1000px;
    margin: 0 auto;
}

.screenshot-item {
    margin: 0;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
    background: var(--color-bg-elevated);
}

.screenshot-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

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

/* ========================================
   BUTTONS
   ======================================== */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-3) var(--space-4);
    font-size: var(--font-size-base);
    font-weight: 600;
    border-radius: var(--radius-full);
    cursor: pointer;
    border: none;
    transition: all var(--transition-fast);
    text-decoration: none;
}

.btn-primary {
    background-color: var(--color-accent-primary);
    color: var(--color-text-inverse);
}

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

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

.btn-secondary:hover {
    background-color: var(--color-bg-elevated);
    border-color: var(--color-border-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-outline {
    background-color: transparent;
    color: var(--color-text-primary);
    border: 2px solid var(--color-border);
}

.btn-outline:hover {
    border-color: var(--color-accent-primary);
    color: var(--color-accent-primary);
    transform: translateY(-2px);
}

/* ========================================
   SECTION TITLE
   ======================================== */

.section-title {
    font-size: var(--font-size-4xl);
    text-align: center;
    margin-bottom: var(--space-8);
    color: var(--color-text-primary);
}

/* ========================================
   CATEGORIES SECTION
   ======================================== */

.categories {
    padding: var(--space-12) 0;
    background-color: var(--color-bg-primary);
}

.category-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-6);
}

.category-card {
    background-color: var(--color-bg-elevated);
    padding: var(--space-6);
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-border);
    transition: all var(--transition-base);
}

.category-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--color-accent-primary);
}

.category-icon {
    font-size: var(--font-size-5xl);
    margin-bottom: var(--space-3);
}

.category-title {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--space-2);
    color: var(--color-text-primary);
}

.category-description {
    color: var(--color-text-secondary);
    margin-bottom: var(--space-4);
    line-height: 1.6;
}

.category-link {
    color: var(--color-accent-primary);
    font-weight: 600;
    font-size: var(--font-size-sm);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    transition: color var(--transition-fast);
}

.category-link:hover {
    color: var(--color-accent-hover);
}

/* ========================================
   FEATURED SECTION
   ======================================== */

.featured {
    padding: var(--space-12) 0;
    background-color: var(--color-bg-secondary);
}

.featured-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--space-6);
    margin-bottom: var(--space-8);
}

/* ========================================
   PRODUCT BADGES
   ======================================== */

.product-badge {
    padding: var(--space-1) var(--space-2);
    border-radius: var(--radius-full);
    font-size: var(--font-size-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    white-space: nowrap;
}

.product-badge-active {
    background-color: #333333;
    color: white;
}

.product-badge-dev {
    background-color: #666666;
    color: white;
}

.product-badge-concept {
    background-color: #999999;
    color: white;
}

.product-badge-planned {
    background-color: #CCCCCC;
    color: #333333;
}

/* ========================================
   CTA SECTION
   ======================================== */

.cta {
    padding: var(--space-12) 0;
    background-color: var(--color-bg-primary);
}

.cta-content {
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
}

.cta-title {
    font-size: var(--font-size-4xl);
    margin-bottom: var(--space-4);
    color: var(--color-text-primary);
}

.cta-description {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-6);
    line-height: 1.6;
}

.email-form {
    margin-bottom: var(--space-3);
}

.email-input-group {
    display: flex;
    gap: var(--space-2);
    max-width: 500px;
    margin: 0 auto;
}

.email-input {
    flex: 1;
    padding: var(--space-3);
    font-size: var(--font-size-base);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-full);
    background-color: var(--color-bg-elevated);
    color: var(--color-text-primary);
    transition: all var(--transition-fast);
}

.email-input:focus {
    outline: none;
    border-color: var(--color-accent-primary);
    box-shadow: 0 0 0 3px rgba(0, 0, 0, 0.05);
}

.email-note {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

/* Consent Checkbox */
.consent-checkbox {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    margin-top: 1rem;
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

.consent-checkbox input[type="checkbox"] {
    margin-top: 0.25rem;
    cursor: pointer;
    flex-shrink: 0;
    width: 1.125rem;
    height: 1.125rem;
    accent-color: var(--color-accent-primary);
}

.consent-checkbox label {
    cursor: pointer;
    line-height: 1.5;
}

.consent-checkbox a {
    color: var(--color-accent-primary);
    text-decoration: underline;
}

.consent-checkbox a:hover {
    color: var(--color-accent-hover);
}

/* ========================================
   FOOTER
   ======================================== */

.footer {
    background-color: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
    padding: var(--space-12) 0 var(--space-6);
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-8);
    margin-bottom: var(--space-8);
}

.footer-brand {
    max-width: 250px;
}

.footer-logo-wrapper {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    margin-bottom: var(--space-2);
}

.footer-logo {
    height: 4rem;
    width: auto;
}

.footer-logo-text {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    line-height: 1;
    font-family: var(--font-logo);
    font-size: 0.917rem;
    font-weight: 600;
    color: var(--color-text-primary);
    letter-spacing: -0.01em;
    text-transform: lowercase;
}

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

.footer-heading {
    font-size: var(--font-size-sm);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--space-3);
    color: var(--color-text-primary);
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: var(--space-2);
}

.footer-links a {
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    transition: color var(--transition-fast);
}

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

.footer-bottom {
    text-align: center;
    padding-top: var(--space-6);
    border-top: 1px solid var(--color-border);
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
}

/* ========================================
   SUB-NAVIGATION (Product Pages)
   ======================================== */

.sub-nav {
    display: flex;
    justify-content: center;
    gap: var(--space-4);
    padding: var(--space-3) 0;
    background-color: var(--color-bg-elevated);
    border-bottom: 1px solid var(--color-border);
}

.sub-nav-link {
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    font-weight: 500;
    padding: var(--space-1) var(--space-2);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.sub-nav-link:hover {
    color: var(--color-text-primary);
    background-color: var(--color-bg-secondary);
}

.sub-nav-link.active {
    color: var(--color-text-primary);
    background-color: var(--color-bg-secondary);
}

/* ========================================
   APP SCREENSHOTS
   ======================================== */

.screenshots {
    padding: var(--space-12) 0;
    background-color: var(--color-bg-secondary);
}

.screenshot-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-4);
    max-width: 900px;
    margin: 0 auto;
}

.screenshot {
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    transition: transform var(--transition-base);
}

.screenshot:hover {
    transform: scale(1.02);
}

.screenshot img {
    width: 100%;
    height: auto;
}

/* ========================================
   APP ICON DISPLAY
   ======================================== */

.app-icon {
    width: 128px;
    height: 128px;
    border-radius: 28px;
    box-shadow: var(--shadow-xl);
    margin: 0 auto var(--space-6);
}

/* ========================================
   FAQ STYLES
   ======================================== */

.faq-item {
    margin-bottom: var(--space-6);
}

.faq-question {
    color: var(--color-text-primary);
    font-size: var(--font-size-xl);
    margin-bottom: var(--space-2);
}

.faq-answer {
    color: var(--color-text-secondary);
    line-height: 1.7;
}

/* ========================================
   RESPONSIVE DESIGN
   ======================================== */

@media (max-width: 768px) {
    :root {
        --font-size-5xl: 2.25rem;
        --font-size-4xl: 1.875rem;
        --font-size-3xl: 1.5rem;
        --space-12: 4rem;
        --space-16: 6rem;
    }

    .hero {
        padding: var(--space-12) 0 var(--space-8);
    }

    .hero-logo {
        height: 100px;
    }

    .product-icon-large {
        width: 100px;
        height: 100px;
    }

    .product-emoji-large {
        font-size: 3rem;
    }

    .logo-text {
        font-size: var(--font-size-sm);
    }

    .footer-logo-text {
        font-size: var(--font-size-sm);
    }

    .hero-actions {
        flex-direction: column;
        width: 100%;
    }

    .hero-actions .btn {
        width: 100%;
    }

    .category-grid {
        grid-template-columns: 1fr;
    }

    .featured-grid {
        grid-template-columns: 1fr;
    }

    .screenshot-gallery {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-2);
    }

    .email-input-group {
        flex-direction: column;
    }

    .email-input-group .btn {
        width: 100%;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: var(--space-6);
    }

    .sub-nav {
        flex-wrap: wrap;
        gap: var(--space-2);
    }

    .screenshot-grid {
        grid-template-columns: 1fr;
    }
}

@media (min-width: 769px) and (max-width: 1024px) {
    .category-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

/* ========================================
   ACCESSIBILITY
   ======================================== */

.skip-to-content {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--color-accent-primary);
    color: var(--color-text-inverse);
    padding: var(--space-2);
    z-index: 200;
}

.skip-to-content:focus {
    top: 0;
}

/* Focus styles */
a:focus-visible,
button:focus-visible,
input:focus-visible {
    outline: 2px solid var(--color-accent-primary);
    outline-offset: 2px;
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}