/* ============================================
   gsim.app - Corporate One-Page Website
   Design System & Styles
   ============================================ */

/* CSS Custom Properties - Design Tokens */
:root {
    /* Color Palette - Neutral */
    --color-gray-50: #f9fafb;
    --color-gray-100: #f3f4f6;
    --color-gray-200: #e5e7eb;
    --color-gray-300: #d1d5db;
    --color-gray-400: #9ca3af;
    --color-gray-500: #6b7280;
    --color-gray-600: #4b5563;
    --color-gray-700: #374151;
    --color-gray-800: #1f2937;
    --color-gray-900: #111827;
    --color-gray-950: #030712;

    /* Color Palette - Primary (Dark Blue) */
    --color-primary-50: #eff6ff;
    --color-primary-100: #dbeafe;
    --color-primary-200: #bfdbfe;
    --color-primary-300: #93c5fd;
    --color-primary-400: #60a5fa;
    --color-primary-500: #3b82f6;
    --color-primary-600: #2563eb;
    --color-primary-700: #1d4ed8;
    --color-primary-800: #1e40af;
    --color-primary-900: #1e3a8a;

    /* Accent Colors */
    --color-accent: #0ea5e9;
    --color-accent-light: #38bdf8;
    --color-accent-dark: #0284c7;

    /* Semantic Colors */
    --color-text-primary: var(--color-gray-900);
    --color-text-secondary: var(--color-gray-600);
    --color-text-tertiary: var(--color-gray-500);
    --color-text-inverse: #ffffff;
    --color-background: #ffffff;
    --color-background-alt: var(--color-gray-50);
    --color-border: var(--color-gray-200);
    --color-border-light: var(--color-gray-100);

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    --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;

    --font-weight-light: 300;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;

    --line-height-tight: 1.25;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.625;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    --spacing-4xl: 6rem;
    --spacing-5xl: 8rem;

    /* Layout */
    --container-max-width: 1200px;
    --container-padding: 1.5rem;
    --section-padding: 6rem;
    --navbar-height: 72px;

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-full: 9999px;
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: var(--navbar-height);
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: var(--line-height-normal);
    color: var(--color-text-primary);
    background-color: var(--color-background);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

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

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

/* ============================================
   Navigation
   ============================================ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid transparent;
    transition: var(--transition-base);
}

.navbar.scrolled {
    border-bottom-color: var(--color-border);
    box-shadow: var(--shadow-sm);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--navbar-height);
}

.nav-brand {
    display: flex;
    align-items: center;
}

.nav-logo {
    height: 157px;
    width: auto;
}

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

.nav-link {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-secondary);
    transition: var(--transition-fast);
    padding: var(--spacing-sm) 0;
    position: relative;
}

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-primary-600);
    transition: var(--transition-fast);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-sm);
}

.hamburger {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-gray-900);
    position: relative;
    transition: var(--transition-fast);
}

.hamburger::before,
.hamburger::after {
    content: '';
    position: absolute;
    width: 24px;
    height: 2px;
    background: var(--color-gray-900);
    transition: var(--transition-fast);
}

.hamburger::before {
    top: -7px;
}

.hamburger::after {
    bottom: -7px;
}

.nav-toggle.active .hamburger {
    background: transparent;
}

.nav-toggle.active .hamburger::before {
    top: 0;
    transform: rotate(45deg);
}

.nav-toggle.active .hamburger::after {
    bottom: 0;
    transform: rotate(-45deg);
}

/* ============================================
   Sections - Base Styles
   ============================================ */
.section {
    padding: var(--section-padding) 0;
}

.section-alt {
    background-color: var(--color-background-alt);
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-4xl);
    max-width: 720px;
    margin-left: auto;
    margin-right: auto;
}

.section-label {
    display: inline-block;
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-primary-600);
    margin-bottom: var(--spacing-md);
}

.section-title {
    font-size: var(--font-size-4xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-text-primary);
    line-height: var(--line-height-tight);
    margin-bottom: var(--spacing-lg);
    letter-spacing: -0.025em;
}

.section-description {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    line-height: var(--line-height-relaxed);
}

/* ============================================
   Buttons
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.875rem 1.75rem;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: var(--transition-fast);
    text-decoration: none;
}

.btn-primary {
    background: var(--color-gray-900);
    color: var(--color-text-inverse);
}

.btn-primary:hover {
    background: var(--color-gray-800);
}

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

.btn-secondary:hover {
    background: var(--color-gray-50);
    border-color: var(--color-gray-300);
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: calc(var(--navbar-height) + var(--spacing-3xl));
    padding-bottom: var(--spacing-4xl);
    background: linear-gradient(180deg, var(--color-background) 0%, var(--color-gray-50) 100%);
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-4xl);
    align-items: center;
}

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

.hero-title {
    font-size: var(--font-size-6xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-gray-900);
    line-height: 1.1;
    letter-spacing: -0.035em;
    margin-bottom: var(--spacing-lg);
}

.hero-subtitle {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-normal);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: var(--line-height-normal);
}

.hero-tagline {
    font-size: var(--font-size-lg);
    color: var(--color-text-tertiary);
    margin-bottom: var(--spacing-2xl);
}

.hero-cta {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

/* Hero Visual - Architecture Diagram */
.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.architecture-diagram {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-2xl);
}

.diagram-layer {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xl) var(--spacing-3xl);
    border-radius: var(--radius-lg);
    text-align: center;
    min-width: 280px;
    transition: var(--transition-base);
}

.diagram-layer span {
    font-weight: var(--font-weight-semibold);
    font-size: var(--font-size-sm);
}

.diagram-layer small {
    font-size: var(--font-size-xs);
    color: var(--color-text-tertiary);
    margin-top: var(--spacing-xs);
}

.layer-top {
    background: var(--color-gray-100);
    border: 1px solid var(--color-gray-200);
    color: var(--color-gray-700);
}

.layer-middle {
    background: var(--color-gray-900);
    color: var(--color-text-inverse);
    box-shadow: var(--shadow-lg);
}

.layer-middle small {
    color: var(--color-gray-400);
}

.layer-bottom {
    background: var(--color-gray-100);
    border: 1px solid var(--color-gray-200);
    color: var(--color-gray-700);
}

.diagram-connector {
    width: 2px;
    height: 24px;
    background: linear-gradient(180deg, var(--color-gray-300) 0%, var(--color-gray-400) 50%, var(--color-gray-300) 100%);
    position: relative;
}

.diagram-connector::before,
.diagram-connector::after {
    content: '';
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--color-gray-400);
}

.diagram-connector::before {
    top: -3px;
}

.diagram-connector::after {
    bottom: -3px;
}

/* ============================================
   Problem Section
   ============================================ */
.problem-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-xl);
}

.problem-card {
    background: var(--color-background);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-2xl);
    transition: var(--transition-base);
}

.problem-card:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--color-gray-300);
}

.problem-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-gray-100);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-lg);
}

.problem-icon svg {
    width: 24px;
    height: 24px;
    color: var(--color-gray-600);
}

.problem-card h3 {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-sm);
}

.problem-card p {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    line-height: var(--line-height-relaxed);
}

/* ============================================
   Platform Section
   ============================================ */
.platform-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-4xl);
    align-items: start;
}

.platform-intro .lead {
    font-size: var(--font-size-xl);
    color: var(--color-text-secondary);
    line-height: var(--line-height-relaxed);
}

.platform-features {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
}

.feature-item {
    display: flex;
    gap: var(--spacing-lg);
}

.feature-marker {
    width: 12px;
    height: 12px;
    min-width: 12px;
    background: var(--color-primary-600);
    border-radius: var(--radius-sm);
    margin-top: 6px;
}

.feature-text h4 {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-xs);
}

.feature-text p {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    line-height: var(--line-height-relaxed);
}

/* ============================================
   Principles Section
   ============================================ */
.principles-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
}

.principles-grid .principle-card:last-child {
    grid-column: 2;
}

.principle-card {
    background: var(--color-background);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-2xl);
    text-align: center;
    transition: var(--transition-base);
}

.principle-card:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--color-gray-300);
}

.principle-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-gray-900);
    border-radius: var(--radius-lg);
    margin: 0 auto var(--spacing-lg);
}

.principle-icon svg {
    width: 28px;
    height: 28px;
    color: var(--color-text-inverse);
}

.principle-card h3 {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-sm);
}

.principle-card p {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    line-height: var(--line-height-relaxed);
}

/* ============================================
   How It Works Section
   ============================================ */
.how-it-works-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-4xl);
    align-items: start;
}

.concept-diagram {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-2xl);
    background: var(--color-gray-50);
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-border);
}

.concept-layer {
    width: 100%;
}

.concept-box {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xl);
    border-radius: var(--radius-md);
    text-align: center;
}

.concept-box .concept-label {
    font-weight: var(--font-weight-semibold);
    font-size: var(--font-size-sm);
}

.concept-box .concept-desc {
    font-size: var(--font-size-xs);
    margin-top: var(--spacing-xs);
    opacity: 0.8;
}

.concept-box.external {
    background: var(--color-gray-200);
    color: var(--color-gray-700);
}

.concept-box.platform {
    background: var(--color-gray-900);
    color: var(--color-text-inverse);
    box-shadow: var(--shadow-lg);
}

.platform-capabilities {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-sm);
}

.platform-capabilities span {
    font-size: var(--font-size-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-sm);
}

.concept-box.resources {
    background: var(--color-gray-200);
    color: var(--color-gray-700);
}

.concept-flow {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) 0;
}

.flow-arrow {
    width: 8px;
    height: 16px;
    position: relative;
}

.flow-arrow::after {
    content: '';
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    border: solid var(--color-gray-400);
    border-width: 0 2px 2px 0;
    padding: 4px;
}

.flow-arrow.down::after {
    top: 0;
    transform: translateX(-50%) rotate(45deg);
}

.flow-arrow.up::after {
    bottom: 0;
    transform: translateX(-50%) rotate(-135deg);
}

.flow-label {
    font-size: var(--font-size-xs);
    color: var(--color-text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.concept-explanation {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
}

.explanation-item {
    display: flex;
    gap: var(--spacing-lg);
}

.explanation-number {
    width: 32px;
    height: 32px;
    min-width: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-gray-100);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    color: var(--color-gray-600);
}

.explanation-text h4 {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-xs);
}

.explanation-text p {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    line-height: var(--line-height-relaxed);
}

/* ============================================
   Domains Section
   ============================================ */
.domains-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-xl);
}

.domain-card {
    background: var(--color-background);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-2xl);
    transition: var(--transition-base);
}

.domain-card:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--color-gray-300);
}

.domain-card-wide {
    grid-column: span 2;
}

.domain-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.domain-icon {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-gray-900);
    border-radius: var(--radius-md);
}

.domain-icon svg {
    width: 22px;
    height: 22px;
    color: var(--color-text-inverse);
}

.domain-card h3 {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
}

.domain-card p {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    line-height: var(--line-height-relaxed);
}

/* ============================================
   Benefits Section
   ============================================ */
.benefits-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
}

.benefits-grid .benefit-item:nth-child(4),
.benefits-grid .benefit-item:nth-child(5) {
    grid-column: span 1;
}

.benefit-item {
    text-align: center;
    padding: var(--spacing-xl);
}

.benefit-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-primary-50);
    border-radius: var(--radius-lg);
    margin: 0 auto var(--spacing-lg);
}

.benefit-icon svg {
    width: 24px;
    height: 24px;
    color: var(--color-primary-600);
}

.benefit-item h4 {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-sm);
}

.benefit-item p {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    line-height: var(--line-height-relaxed);
}

/* ============================================
   Audience Section
   ============================================ */
.audience-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-xl);
}

.audience-card {
    background: var(--color-background);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-2xl);
    display: flex;
    gap: var(--spacing-lg);
    align-items: flex-start;
    transition: var(--transition-base);
}

.audience-card:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--color-gray-300);
}

.audience-icon {
    width: 48px;
    height: 48px;
    min-width: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-gray-100);
    border-radius: var(--radius-md);
}

.audience-icon svg {
    width: 24px;
    height: 24px;
    color: var(--color-gray-600);
}

.audience-card h3 {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-sm);
}

.audience-card p {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    line-height: var(--line-height-relaxed);
}

/* ============================================
   Manifesto Section
   ============================================ */
.section-manifesto {
    background: var(--color-gray-900);
    padding: var(--spacing-5xl) 0;
}

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

.manifesto-quote {
    border: none;
    margin: 0;
    padding: 0;
}

.manifesto-quote p {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-light);
    color: var(--color-text-inverse);
    line-height: var(--line-height-relaxed);
    margin-bottom: var(--spacing-md);
}

.manifesto-quote p:last-child {
    font-weight: var(--font-weight-medium);
    margin-bottom: 0;
}

/* ============================================
   Footer
   ============================================ */
.footer {
    background: var(--color-gray-950);
    padding: var(--spacing-3xl) 0 var(--spacing-xl);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: var(--spacing-2xl);
    border-bottom: 1px solid var(--color-gray-800);
    margin-bottom: var(--spacing-xl);
}

.footer-logo {
    height: 134px;
    width: auto;
    filter: brightness(0) invert(1);
}

.footer-tagline {
    font-size: var(--font-size-sm);
    color: var(--color-gray-500);
    margin-top: var(--spacing-xs);
}

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

.footer-link {
    font-size: var(--font-size-sm);
    color: var(--color-gray-400);
    transition: var(--transition-fast);
}

.footer-link:hover {
    color: var(--color-text-inverse);
}

.footer-bottom {
    text-align: center;
}

.copyright {
    font-size: var(--font-size-xs);
    color: var(--color-gray-600);
}

.powered-by {
    font-size: var(--font-size-xs);
    color: var(--color-gray-600);
    margin-top: var(--spacing-sm);
}

.powered-by a {
    color: var(--color-gray-400);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.powered-by a:hover {
    color: var(--color-text-inverse);
}

/* ============================================
   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);
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 1024px) {
    :root {
        --section-padding: 5rem;
    }

    .hero .container {
        grid-template-columns: 1fr;
        gap: var(--spacing-3xl);
    }

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

    .hero-cta {
        justify-content: center;
    }

    .platform-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-2xl);
    }

    .how-it-works-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-2xl);
    }

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

    .principles-grid .principle-card:last-child {
        grid-column: span 2;
    }

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

@media (max-width: 768px) {
    :root {
        --section-padding: 4rem;
        --container-padding: 1.25rem;
    }

    .nav-menu {
        position: fixed;
        top: var(--navbar-height);
        left: 0;
        right: 0;
        background: var(--color-background);
        flex-direction: column;
        padding: var(--spacing-xl);
        gap: var(--spacing-md);
        border-bottom: 1px solid var(--color-border);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition-base);
    }

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

    .nav-toggle {
        display: block;
    }

    .hero-title {
        font-size: var(--font-size-4xl);
    }

    .hero-subtitle {
        font-size: var(--font-size-xl);
    }

    .section-title {
        font-size: var(--font-size-3xl);
    }

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

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

    .principles-grid .principle-card:last-child {
        grid-column: span 1;
    }

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

    .domain-card-wide {
        grid-column: span 1;
    }

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

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

    .audience-card {
        flex-direction: column;
        text-align: center;
    }

    .audience-icon {
        margin: 0 auto;
    }

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

    .footer-links {
        justify-content: center;
    }

    .manifesto-quote p {
        font-size: var(--font-size-xl);
    }

    .architecture-diagram {
        padding: var(--spacing-lg);
    }

    .diagram-layer {
        padding: var(--spacing-lg) var(--spacing-xl);
        min-width: 240px;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: var(--font-size-3xl);
    }

    .hero-cta {
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }

    .section-title {
        font-size: var(--font-size-2xl);
    }
}

/* ============================================
   Privacy Policy Page
   ============================================ */
.policy-section {
    padding-top: calc(var(--navbar-height) + var(--spacing-4xl));
    padding-bottom: var(--spacing-4xl);
    min-height: 100vh;
}

.policy-header {
    text-align: center;
    margin-bottom: var(--spacing-4xl);
}

.policy-title {
    font-size: var(--font-size-4xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.025em;
}

.policy-subtitle {
    font-size: var(--font-size-base);
    color: var(--color-text-tertiary);
}

.policy-content {
    max-width: 800px;
    margin: 0 auto;
}

.policy-block {
    margin-bottom: var(--spacing-3xl);
}

.policy-block h2 {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--color-primary-600);
}

.policy-block h3 {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    margin-top: var(--spacing-xl);
    margin-bottom: var(--spacing-md);
}

.policy-block h4 {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-sm);
}

.policy-block p {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    line-height: var(--line-height-relaxed);
    margin-bottom: var(--spacing-md);
}

.policy-block ul {
    list-style: none;
    margin-bottom: var(--spacing-lg);
}

.policy-block ul li {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    line-height: var(--line-height-relaxed);
    padding-left: var(--spacing-xl);
    position: relative;
    margin-bottom: var(--spacing-sm);
}

.policy-block ul li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 10px;
    width: 6px;
    height: 6px;
    background: var(--color-primary-600);
    border-radius: 50%;
}

.policy-block ul li strong {
    color: var(--color-text-primary);
}

.cookie-type {
    background: var(--color-background-alt);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
}

.cookie-type h4 {
    margin-bottom: var(--spacing-xs);
}

.cookie-type p {
    margin-bottom: 0;
}

/* ============================================
   Cookie Consent Banner
   ============================================ */
.cookie-banner {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 2000;
    background: var(--color-gray-900);
    padding: var(--spacing-xl);
    transform: translateY(100%);
    transition: transform var(--transition-base);
    box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.15);
}

.cookie-banner.visible {
    transform: translateY(0);
}

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

.cookie-banner-text h3 {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-inverse);
    margin-bottom: var(--spacing-sm);
}

.cookie-banner-text p {
    font-size: var(--font-size-sm);
    color: var(--color-gray-400);
    line-height: var(--line-height-relaxed);
    max-width: 600px;
}

.cookie-banner-actions {
    display: flex;
    gap: var(--spacing-md);
    flex-shrink: 0;
}

.cookie-banner .btn-secondary {
    background: transparent;
    border-color: var(--color-gray-600);
    color: var(--color-text-inverse);
}

.cookie-banner .btn-secondary:hover {
    background: var(--color-gray-800);
    border-color: var(--color-gray-500);
}

.cookie-banner .btn-primary {
    background: var(--color-text-inverse);
    color: var(--color-gray-900);
}

.cookie-banner .btn-primary:hover {
    background: var(--color-gray-200);
}

/* ============================================
   Cookie Settings Modal
   ============================================ */
.cookie-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 3000;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-base), visibility var(--transition-base);
}

.cookie-modal.visible {
    opacity: 1;
    visibility: visible;
}

.cookie-modal-content {
    background: var(--color-background);
    border-radius: var(--radius-xl);
    max-width: 500px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-xl);
}

.cookie-modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-xl);
    border-bottom: 1px solid var(--color-border);
}

.cookie-modal-header h2 {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
}

.cookie-modal-close {
    background: none;
    border: none;
    font-size: 28px;
    color: var(--color-text-tertiary);
    cursor: pointer;
    padding: 0;
    line-height: 1;
    transition: color var(--transition-fast);
}

.cookie-modal-close:hover {
    color: var(--color-text-primary);
}

.cookie-modal-body {
    padding: var(--spacing-xl);
}

.cookie-modal-body > p {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xl);
    line-height: var(--line-height-relaxed);
}

.cookie-option {
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
}

.cookie-option:last-child {
    margin-bottom: 0;
}

.cookie-option-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: var(--spacing-lg);
}

.cookie-option-info h4 {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-xs);
}

.cookie-option-info p {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    line-height: var(--line-height-normal);
}

/* Toggle Switch */
.cookie-toggle {
    position: relative;
    display: inline-block;
    width: 48px;
    height: 26px;
    flex-shrink: 0;
}

.cookie-toggle input {
    opacity: 0;
    width: 0;
    height: 0;
}

.cookie-toggle-slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--color-gray-300);
    transition: var(--transition-fast);
    border-radius: var(--radius-full);
}

.cookie-toggle-slider::before {
    position: absolute;
    content: '';
    height: 20px;
    width: 20px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    transition: var(--transition-fast);
    border-radius: 50%;
    box-shadow: var(--shadow-sm);
}

.cookie-toggle input:checked + .cookie-toggle-slider {
    background-color: var(--color-primary-600);
}

.cookie-toggle input:checked + .cookie-toggle-slider::before {
    transform: translateX(22px);
}

.cookie-toggle-slider.disabled {
    background-color: var(--color-primary-600);
    opacity: 0.6;
    cursor: not-allowed;
}

.cookie-modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-md);
    padding: var(--spacing-xl);
    border-top: 1px solid var(--color-border);
}

/* ============================================
   Cookie Responsive Styles
   ============================================ */
@media (max-width: 768px) {
    .cookie-banner-content {
        flex-direction: column;
        text-align: center;
    }

    .cookie-banner-text p {
        max-width: 100%;
    }

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

    .cookie-banner-actions .btn {
        width: 100%;
    }

    .policy-title {
        font-size: var(--font-size-3xl);
    }

    .policy-block h2 {
        font-size: var(--font-size-xl);
    }
}

@media (max-width: 480px) {
    .cookie-modal-content {
        margin: var(--spacing-md);
    }

    .cookie-modal-footer {
        flex-direction: column;
    }

    .cookie-modal-footer .btn {
        width: 100%;
    }
}