/* ===================================
   CSS Variables & Theme
   =================================== */
:root {
    /* Colors - Tech Blue Palette */
    --color-primary: #1560BD;
    --color-primary-light: #2D68C4;
    --color-primary-dark: #11509D;
    --color-secondary: #536878;
    --color-accent: #0070FF;
    --color-success: #10B981;
    --color-error: #EF4444;
    --color-warning: #F59E0B;
    
    /* Neutral Colors */
    --color-background: #FFFFFF;
    --color-surface: #F8FAFC;
    --color-surface-elevated: #FFFFFF;
    --color-border: #E2E8F0;
    --color-border-light: #F1F5F9;
    
    /* Text Colors */
    --color-text-primary: #0F172A;
    --color-text-secondary: #475569;
    --color-text-tertiary: #94A3B8;
    --color-text-inverse: #FFFFFF;
    
    /* Gradient Colors */
    --gradient-primary: linear-gradient(135deg, #1560BD 0%, #0070FF 100%);
    --gradient-aurora: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
    --gradient-mesh: radial-gradient(at 40% 20%, rgba(21, 96, 189, 0.15) 0px, transparent 50%),
                     radial-gradient(at 80% 0%, rgba(0, 112, 255, 0.15) 0px, transparent 50%),
                     radial-gradient(at 0% 50%, rgba(83, 104, 120, 0.1) 0px, transparent 50%);
    
    /* Typography */
    --font-heading: 'Manrope', sans-serif;
    --font-body: 'Source Sans 3', sans-serif;
    
    /* Font Sizes */
    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-lg: 1.125rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;
    --text-3xl: 1.875rem;
    --text-4xl: 2.25rem;
    --text-5xl: 3rem;
    --text-6xl: 3.75rem;
    
    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;
    
    /* 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);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    
    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 300ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
}

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

/* ===================================
   Typography Classes
   =================================== */
.heading-1 {
    font-family: var(--font-heading);
    font-size: var(--text-6xl);
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: -0.02em;
}

.heading-2 {
    font-family: var(--font-heading);
    font-size: var(--text-4xl);
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: -0.01em;
}

.heading-3 {
    font-family: var(--font-heading);
    font-size: var(--text-2xl);
    font-weight: 600;
    line-height: 1.3;
}

.body-large {
    font-size: var(--text-lg);
    line-height: 1.7;
}

.body-base {
    font-size: var(--text-base);
    line-height: 1.6;
}

.body-small {
    font-size: var(--text-sm);
    line-height: 1.5;
}

/* ===================================
   Layout
   =================================== */
.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--space-6);
}

/* ===================================
   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 var(--color-border-light);
    transition: all var(--transition-base);
}

.navbar.scrolled {
    box-shadow: var(--shadow-md);
}

.nav-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-4) 0;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-family: var(--font-heading);
    font-size: var(--text-xl);
    font-weight: 700;
    color: var(--color-primary);
    text-decoration: none;
}

.brand-icon {
    font-size: var(--text-2xl);
}

.nav-menu {
    display: flex;
    gap: var(--space-8);
    list-style: none;
    margin: 0;
    padding: 0;
}

.nav-link {
    font-family: var(--font-heading);
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: color var(--transition-fast);
    position: relative;
}

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: width var(--transition-base);
}

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

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-2);
}

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

.nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

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

.nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
}

/* ===================================
   Hero Section
   =================================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    overflow: hidden;
    background: var(--gradient-mesh);
    padding-top: 80px;
}

.hero-background {
    position: absolute;
    inset: 0;
    overflow: hidden;
    z-index: 0;
}

.gradient-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.3;
    animation: float 20s ease-in-out infinite;
}

.orb-1 {
    width: 500px;
    height: 500px;
    background: var(--gradient-primary);
    top: -10%;
    left: -10%;
    animation-delay: 0s;
}

.orb-2 {
    width: 400px;
    height: 400px;
    background: linear-gradient(135deg, #0070FF 0%, #667eea 100%);
    bottom: -5%;
    right: -5%;
    animation-delay: 5s;
}

.orb-3 {
    width: 350px;
    height: 350px;
    background: linear-gradient(135deg, #764ba2 0%, #f093fb 100%);
    top: 50%;
    right: 20%;
    animation-delay: 10s;
}

@keyframes float {
    0%, 100% {
        transform: translate(0, 0) scale(1);
    }
    33% {
        transform: translate(30px, -30px) scale(1.1);
    }
    66% {
        transform: translate(-20px, 20px) scale(0.9);
    }
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 800px;
    padding: var(--space-20) 0;
}

.badge {
    display: inline-block;
    padding: var(--space-2) var(--space-4);
    background: rgba(21, 96, 189, 0.1);
    border: 1px solid rgba(21, 96, 189, 0.2);
    border-radius: var(--radius-full);
    color: var(--color-primary);
    font-size: var(--text-sm);
    font-weight: 600;
    font-family: var(--font-heading);
    margin-bottom: var(--space-6);
    backdrop-filter: blur(10px);
}

.hero-title {
    font-family: var(--font-heading);
    font-size: var(--text-6xl);
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: -0.02em;
    margin-bottom: var(--space-6);
    color: var(--color-text-primary);
}

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

.hero-subtitle {
    font-size: var(--text-xl);
    line-height: 1.7;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-10);
    max-width: 600px;
}

.hero-cta {
    display: flex;
    gap: var(--space-4);
    margin-bottom: var(--space-10);
    flex-wrap: wrap;
}

.btn-large {
    padding: var(--space-4) var(--space-10);
    font-size: var(--text-lg);
}

.hero-stats {
    display: flex;
    gap: var(--space-8);
    flex-wrap: wrap;
}

.stat-item {
    text-align: center;
}

.stat-number {
    font-family: var(--font-heading);
    font-size: var(--text-3xl);
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--space-2);
}

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

/* ===================================
   About Section
   =================================== */
.about-section {
    padding: var(--space-20) 0;
    background: var(--color-background);
}

.about-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: var(--space-12);
    align-items: start;
}

.about-subtitle {
    font-family: var(--font-heading);
    font-size: var(--text-2xl);
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--space-4);
    margin-top: var(--space-8);
}

.about-subtitle:first-child {
    margin-top: 0;
}

.about-text {
    font-size: var(--text-lg);
    line-height: 1.8;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-4);
}

.about-list {
    list-style: none;
    padding: 0;
    margin: var(--space-6) 0;
}

.about-list li {
    display: flex;
    gap: var(--space-3);
    margin-bottom: var(--space-4);
    font-size: var(--text-base);
    line-height: 1.7;
    color: var(--color-text-secondary);
}

.list-icon {
    color: var(--color-primary);
    font-weight: 700;
    font-size: var(--text-lg);
}

.tech-stack-card {
    background: var(--color-surface);
    border-radius: var(--radius-xl);
    padding: var(--space-8);
    border: 1px solid var(--color-border-light);
    box-shadow: var(--shadow-lg);
    position: sticky;
    top: 100px;
}

.card-title {
    font-family: var(--font-heading);
    font-size: var(--text-xl);
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--space-6);
}

.tech-items {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.tech-item {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    padding: var(--space-4);
    background: var(--color-background);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
}

.tech-item:hover {
    transform: translateX(4px);
    box-shadow: var(--shadow-sm);
}

.tech-icon {
    font-size: var(--text-3xl);
}

.tech-name {
    font-family: var(--font-heading);
    font-size: var(--text-base);
    font-weight: 600;
    color: var(--color-text-primary);
}

.tech-desc {
    font-size: var(--text-sm);
    color: var(--color-text-tertiary);
}

/* ===================================
   Main Application Section
   =================================== */
.main-section {
    padding: var(--space-20) 0;
    background: var(--color-surface);
}

.app-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-8);
    align-items: start;
}

.panel {
    background: var(--color-surface-elevated);
    border-radius: var(--radius-2xl);
    padding: var(--space-8);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--color-border-light);
}

.panel-header {
    margin-bottom: var(--space-8);
}

.panel-title {
    font-family: var(--font-heading);
    font-size: var(--text-3xl);
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: var(--space-2);
}

.panel-description {
    font-size: var(--text-base);
    color: var(--color-text-secondary);
}

/* ===================================
   Form Styles
   =================================== */
.vibe-form {
    display: flex;
    flex-direction: column;
    gap: var(--space-6);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.form-label {
    font-family: var(--font-heading);
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--color-text-primary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    font-family: var(--font-body);
    font-size: var(--text-base);
    color: var(--color-text-primary);
    background: var(--color-surface);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
    outline: none;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(21, 96, 189, 0.1);
}

.form-textarea {
    resize: vertical;
    min-height: 100px;
}

.form-select {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23475569' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right var(--space-4) center;
    padding-right: var(--space-10);
}

.form-range {
    width: 100%;
    height: 6px;
    border-radius: var(--radius-full);
    background: var(--color-border);
    outline: none;
    -webkit-appearance: none;
    appearance: none;
}

.form-range::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--gradient-primary);
    cursor: pointer;
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-fast);
}

.form-range::-webkit-slider-thumb:hover {
    transform: scale(1.1);
}

.form-range::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--gradient-primary);
    cursor: pointer;
    border: none;
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-fast);
}

.form-range::-moz-range-thumb:hover {
    transform: scale(1.1);
}

.range-labels {
    display: flex;
    justify-content: space-between;
    font-size: var(--text-xs);
    color: var(--color-text-tertiary);
    margin-top: var(--space-2);
}

/* ===================================
   Button Styles
   =================================== */
.btn {
    position: relative;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-4) var(--space-8);
    font-family: var(--font-heading);
    font-size: var(--text-base);
    font-weight: 600;
    border: none;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-base);
    outline: none;
    overflow: hidden;
}

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

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-primary.loading {
    pointer-events: none;
}

.btn-primary.loading .btn-text {
    opacity: 0;
}

.btn-primary.loading .btn-loader {
    opacity: 1;
}

.btn-secondary {
    background: var(--color-surface);
    color: var(--color-primary);
    border: 2px solid var(--color-border);
}

.btn-secondary:hover {
    background: var(--color-border-light);
    border-color: var(--color-primary);
}

.btn-loader {
    position: absolute;
    width: 20px;
    height: 20px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    opacity: 0;
    animation: spin 0.6s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.btn-copy {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-3);
    font-family: var(--font-heading);
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--color-text-secondary);
    background: transparent;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-copy:hover {
    color: var(--color-primary);
    border-color: var(--color-primary);
    background: rgba(21, 96, 189, 0.05);
}

/* ===================================
   Output Styles
   =================================== */
.output-section {
    margin-bottom: var(--space-6);
}

.output-section:last-child {
    margin-bottom: 0;
}

.output-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-4);
}

.output-title {
    font-family: var(--font-heading);
    font-size: var(--text-lg);
    font-weight: 600;
    color: var(--color-text-primary);
}

.output-content {
    padding: var(--space-6);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    font-size: var(--text-base);
    line-height: 1.8;
    color: var(--color-text-primary);
    white-space: pre-wrap;
    word-wrap: break-word;
}

/* ===================================
   Empty & Error States
   =================================== */
.empty-state,
.error-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--space-16) var(--space-8);
    text-align: center;
}

.empty-icon,
.error-icon {
    margin-bottom: var(--space-6);
    color: var(--color-text-tertiary);
}

.error-icon {
    color: var(--color-error);
}

.empty-title,
.error-title {
    font-family: var(--font-heading);
    font-size: var(--text-2xl);
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--space-3);
}

.empty-description,
.error-description {
    font-size: var(--text-base);
    color: var(--color-text-secondary);
    max-width: 400px;
    margin-bottom: var(--space-6);
}

/* ===================================
   Section Headers
   =================================== */
.section-header {
    text-align: center;
    margin-bottom: var(--space-16);
}

.section-title {
    font-family: var(--font-heading);
    font-size: var(--text-4xl);
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: var(--space-4);
}

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

/* ===================================
   Features Section
   =================================== */
.features-section {
    padding: var(--space-20) 0;
    background: var(--color-background);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-8);
}

.feature-card {
    padding: var(--space-8);
    background: var(--color-surface);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-xl);
    transition: all var(--transition-base);
}

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

.feature-icon {
    width: 64px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    border-radius: var(--radius-lg);
    color: white;
    margin-bottom: var(--space-6);
}

.feature-title {
    font-family: var(--font-heading);
    font-size: var(--text-xl);
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--space-3);
}

.feature-description {
    font-size: var(--text-base);
    color: var(--color-text-secondary);
    line-height: 1.7;
}

/* ===================================
   Tutorial Section
   =================================== */
.tutorial-section {
    padding: var(--space-20) 0;
    background: var(--color-background);
}

.tutorial-steps {
    max-width: 900px;
    margin: 0 auto;
}

.tutorial-step {
    display: flex;
    gap: var(--space-8);
    margin-bottom: var(--space-12);
    position: relative;
}

.tutorial-step:not(:last-child)::after {
    content: '';
    position: absolute;
    left: 30px;
    top: 80px;
    bottom: -48px;
    width: 2px;
    background: linear-gradient(to bottom, var(--color-primary), transparent);
}

.step-number {
    flex-shrink: 0;
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    color: white;
    font-family: var(--font-heading);
    font-size: var(--text-xl);
    font-weight: 700;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

.step-content {
    flex: 1;
}

.step-title {
    font-family: var(--font-heading);
    font-size: var(--text-2xl);
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--space-3);
}

.step-description {
    font-size: var(--text-base);
    line-height: 1.7;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-4);
}

.step-list {
    list-style: none;
    padding: 0;
    margin: var(--space-4) 0;
}

.step-list li {
    padding: var(--space-2) 0;
    font-size: var(--text-base);
    color: var(--color-text-secondary);
}

.example-box {
    background: var(--color-surface);
    border-left: 4px solid var(--color-primary);
    padding: var(--space-4);
    border-radius: var(--radius-md);
    margin: var(--space-4) 0;
}

.example-box.bad {
    border-left-color: var(--color-error);
    background: rgba(239, 68, 68, 0.05);
}

.example-label {
    font-family: var(--font-heading);
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--color-primary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--space-2);
}

.example-box.bad .example-label {
    color: var(--color-error);
}

.example-text {
    font-size: var(--text-base);
    color: var(--color-text-secondary);
    margin: 0;
}

.tutorial-tips {
    margin-top: var(--space-16);
    background: var(--color-surface);
    padding: var(--space-10);
    border-radius: var(--radius-2xl);
    border: 1px solid var(--color-border-light);
}

.tips-title {
    font-family: var(--font-heading);
    font-size: var(--text-2xl);
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--space-8);
    text-align: center;
}

.tips-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-6);
}

.tip-card {
    background: var(--color-background);
    padding: var(--space-6);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border-light);
}

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

.tip-title {
    font-family: var(--font-heading);
    font-size: var(--text-lg);
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--space-2);
}

.tip-text {
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* ===================================
   FAQ Section
   =================================== */
.faq-section {
    padding: var(--space-20) 0;
    background: var(--color-surface);
}

.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background: var(--color-background);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-4);
    border: 1px solid var(--color-border-light);
    overflow: hidden;
}

.faq-question {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-5);
    background: none;
    border: none;
    font-family: var(--font-heading);
    font-size: var(--text-lg);
    font-weight: 600;
    color: var(--color-text-primary);
    text-align: left;
    cursor: pointer;
    transition: all var(--transition-base);
}

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

.faq-icon {
    flex-shrink: 0;
    transition: transform var(--transition-base);
}

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

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

.faq-item.active .faq-answer {
    max-height: 1000px;
}

.faq-answer p,
.faq-answer ul,
.faq-answer ol {
    padding: 0 var(--space-5) var(--space-5);
    margin: 0;
    font-size: var(--text-base);
    line-height: 1.7;
    color: var(--color-text-secondary);
}

.faq-answer ul,
.faq-answer ol {
    padding-left: var(--space-10);
}

.faq-answer li {
    margin-bottom: var(--space-2);
}

/* ===================================
   Footer
   =================================== */
.footer {
    padding: var(--space-16) 0 var(--space-8);
    background: var(--color-text-primary);
    color: var(--color-text-inverse);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--space-10);
    margin-bottom: var(--space-10);
}

.footer-title {
    font-family: var(--font-heading);
    font-size: var(--text-2xl);
    font-weight: 700;
    margin-bottom: var(--space-4);
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.footer-description {
    font-size: var(--text-base);
    line-height: 1.7;
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: var(--space-6);
}

.footer-tech {
    display: flex;
    gap: var(--space-3);
    flex-wrap: wrap;
}

.tech-badge {
    padding: var(--space-2) var(--space-3);
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    font-size: var(--text-xs);
    font-weight: 600;
}

.footer-heading {
    font-family: var(--font-heading);
    font-size: var(--text-base);
    font-weight: 600;
    margin-bottom: var(--space-4);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.footer-links {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-links li {
    margin-bottom: var(--space-3);
}

.footer-link {
    font-size: var(--text-sm);
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

.footer-text {
    font-size: var(--text-sm);
    color: rgba(255, 255, 255, 0.5);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--space-8);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-copyright {
    font-size: var(--text-sm);
    color: rgba(255, 255, 255, 0.5);
}

.footer-meta {
    font-size: var(--text-sm);
    color: rgba(255, 255, 255, 0.5);
}

/* ===================================
   Responsive Design
   =================================== */
@media (max-width: 1024px) {
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        background: white;
        flex-direction: column;
        padding: var(--space-6);
        box-shadow: var(--shadow-lg);
        transition: left var(--transition-base);
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .hero-title {
        font-size: var(--text-5xl);
    }
    
    .about-grid {
        grid-template-columns: 1fr;
    }
    
    .tech-stack-card {
        position: static;
    }
    
    .app-grid {
        grid-template-columns: 1fr;
    }
    
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .tips-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    .hero-title {
        font-size: var(--text-4xl);
    }
    
    .hero-subtitle {
        font-size: var(--text-lg);
    }
    
    .hero-cta {
        flex-direction: column;
    }
    
    .btn-large {
        width: 100%;
    }
    
    .hero-stats {
        gap: var(--space-6);
    }
    
    .panel {
        padding: var(--space-6);
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .tutorial-step {
        flex-direction: column;
    }
    
    .tutorial-step:not(:last-child)::after {
        display: none;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: var(--space-4);
        text-align: center;
    }
}