/* ===================================
   kapagame - Main Stylesheet
   A unified educational platform
   =================================== */

/* CSS Variables */
:root {
    --primary-color: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #3b82f6;
    --secondary-color: #7c3aed;
    --accent-color: #06b6d4;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --error-color: #ef4444;
    
    --math-color: #3b82f6;
    --physics-color: #8b5cf6;
    --units-color: #10b981;
    --time-color: #f59e0b;
    --guides-color: #14b8a6;
    --glossary-color: #06b6d4;
    
    --text-primary: #1f2937;
    --text-secondary: #4b5563;
    --text-muted: #9ca3af;
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --bg-tertiary: #f3f4f6;
    --border-color: #e5e7eb;
    
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'Fira Code', 'Consolas', monospace;
    
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 350ms ease;
    
    --container-max: 1280px;
    --header-height: 72px;
}

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

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

body {
    font-family: var(--font-family);
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

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

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

a:hover {
    color: var(--primary-dark);
}

ul, ol {
    list-style: none;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

input, select, textarea {
    font-family: inherit;
    font-size: inherit;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.3;
    color: var(--text-primary);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.125rem; }
h6 { font-size: 1rem; }

p {
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

/* Container */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 1.5rem;
}

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

.header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.25rem;
}

/* Navigation */
.nav {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.625rem 1rem;
    color: var(--text-secondary);
    font-weight: 500;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

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

.nav-link.active {
    color: var(--primary-color);
    background: rgba(37, 99, 235, 0.1);
}

.nav-link svg {
    width: 20px;
    height: 20px;
}

/* Mobile Menu Toggle */
.menu-toggle {
    display: none;
    width: 40px;
    height: 40px;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    color: var(--text-primary);
}

.menu-toggle:hover {
    background: var(--bg-tertiary);
}

.menu-toggle svg {
    width: 24px;
    height: 24px;
}

/* Mobile Navigation */
.mobile-nav {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg-primary);
    z-index: 999;
    padding: calc(var(--header-height) + 1rem) 1.5rem 1.5rem;
    overflow-y: auto;
}

.mobile-nav.active {
    display: block;
}

.mobile-nav-section {
    margin-bottom: 1.5rem;
}

.mobile-nav-title {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.75rem;
    padding: 0 0.5rem;
}

.mobile-nav-link {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem;
    color: var(--text-primary);
    font-weight: 500;
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
}

.mobile-nav-link:hover,
.mobile-nav-link.active {
    background: var(--bg-tertiary);
    color: var(--primary-color);
}

.mobile-nav-link svg {
    width: 24px;
    height: 24px;
}

/* Main Content */
.main {
    flex: 1;
    margin-top: var(--header-height);
    padding: 2rem 0;
}

/* Hero Section */
.hero {
    position: relative;
    padding: 4rem 0;
    background: linear-gradient(135deg, #1e3a8a 0%, #7c3aed 50%, #06b6d4 100%);
    color: white;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('../assets/banner-hero.jpg') center/cover no-repeat;
    opacity: 0.3;
}

.hero .container {
    position: relative;
    z-index: 1;
}

.hero-content {
    max-width: 700px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: rgba(255, 255, 255, 0.15);
    border-radius: 999px;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 1.5rem;
}

.hero-title {
    font-size: 3rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    color: white;
}

.hero-description {
    font-size: 1.25rem;
    opacity: 0.9;
    margin-bottom: 2rem;
    color: rgba(255, 255, 255, 0.9);
}

.hero-actions {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.875rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: var(--primary-color);
    color: white;
}

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

.btn-secondary {
    background: rgba(255, 255, 255, 0.15);
    color: white;
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.25);
    color: white;
}

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

.btn-outline:hover {
    background: var(--primary-color);
    color: white;
}

.btn-white {
    background: white;
    color: var(--primary-color);
}

.btn-white:hover {
    background: var(--bg-tertiary);
    color: var(--primary-dark);
}

.btn svg {
    width: 20px;
    height: 20px;
}

/* Section */
.section {
    padding: 4rem 0;
}

.section-header {
    text-align: center;
    margin-bottom: 3rem;
}

.section-title {
    font-size: 2rem;
    margin-bottom: 1rem;
}

.section-description {
    font-size: 1.125rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* Category Grid */
.category-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.category-card {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: 1.5rem;
    transition: all var(--transition-normal);
}

.category-card:hover {
    border-color: var(--primary-light);
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

.category-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.category-icon.math { background: rgba(59, 130, 246, 0.1); color: var(--math-color); }
.category-icon.physics { background: rgba(139, 92, 246, 0.1); color: var(--physics-color); }
.category-icon.units { background: rgba(16, 185, 129, 0.1); color: var(--units-color); }
.category-icon.time { background: rgba(245, 158, 11, 0.1); color: var(--time-color); }
.category-icon.guides { background: rgba(20, 184, 166, 0.1); color: var(--guides-color); }
.category-icon.glossary { background: rgba(6, 182, 212, 0.1); color: var(--glossary-color); }

.category-title {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

.category-description {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    margin-bottom: 1rem;
}

.category-links {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.category-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 0.75rem;
    color: var(--text-secondary);
    font-size: 0.9375rem;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.category-link:hover {
    background: var(--bg-tertiary);
    color: var(--primary-color);
}

.category-link svg {
    width: 18px;
    height: 18px;
}

/* Tool Page Layout */
.tool-page {
    max-width: 900px;
    margin: 0 auto;
}

.tool-header {
    margin-bottom: 2rem;
}

.tool-breadcrumb {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-bottom: 1rem;
}

.tool-breadcrumb a {
    color: var(--text-secondary);
}

.tool-breadcrumb a:hover {
    color: var(--primary-color);
}

.tool-breadcrumb svg {
    width: 16px;
    height: 16px;
}

.tool-title {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.tool-subtitle {
    color: var(--text-secondary);
    font-size: 1.125rem;
}

/* Content Sections */
.content-section {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: 2rem;
    margin-bottom: 1.5rem;
}

.content-section-title {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.content-section-title svg {
    width: 24px;
    height: 24px;
    color: var(--primary-color);
}

.content-section p {
    color: var(--text-secondary);
    line-height: 1.7;
}

/* Formula Display */
.formula-box {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    text-align: center;
    margin: 1rem 0;
}

.formula {
    font-family: var(--font-mono);
    font-size: 1.5rem;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.formula-description {
    font-size: 0.875rem;
    color: var(--text-muted);
}

/* Calculator */
.calculator {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
}

.calc-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-bottom: 1rem;
}

.calc-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.calc-label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-primary);
}

.calc-input {
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 1rem;
    background: var(--bg-primary);
    transition: all var(--transition-fast);
}

.calc-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.calc-input::placeholder {
    color: var(--text-muted);
}

.calc-select {
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 1rem;
    background: var(--bg-primary);
    cursor: pointer;
}

.input-with-unit {
    display: flex;
    gap: 0.5rem;
}

.input-with-unit .calc-input {
    flex: 1;
    min-width: 0;
}

.input-with-unit .calc-select {
    width: auto;
    flex-shrink: 0;
}

.calc-btn {
    padding: 0.875rem 1.5rem;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.calc-btn:hover {
    background: var(--primary-dark);
}

.calc-btn:disabled {
    background: var(--text-muted);
    cursor: not-allowed;
}

/* Educational Disclaimer */
.educational-disclaimer {
    margin: 1rem 0;
    padding: 14px 16px;
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.1), rgba(139, 92, 246, 0.1));
    border-left: 4px solid var(--primary-color);
    border-radius: 8px;
    font-size: 0.875rem;
    color: var(--text-secondary);
    display: flex;
    align-items: flex-start;
    gap: 10px;
}

.educational-disclaimer svg {
    flex-shrink: 0;
    width: 18px;
    height: 18px;
    color: var(--primary-color);
    margin-top: 2px;
}

.educational-disclaimer strong {
    color: var(--text-primary);
}

.calc-result {
    margin-top: 1rem;
    padding: 1.25rem;
    background: var(--bg-primary);
    border: 2px solid var(--success-color);
    border-radius: var(--radius-lg);
}

.calc-result-label {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-bottom: 0.25rem;
}

.calc-result-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    font-family: var(--font-mono);
}

/* Example Box */
.example-box {
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.05), rgba(124, 58, 237, 0.05));
    border: 1px solid rgba(37, 99, 235, 0.2);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
}

.example-title {
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 0.75rem;
}

.example-content {
    color: var(--text-secondary);
    line-height: 1.7;
}

.example-content code {
    background: rgba(37, 99, 235, 0.1);
    padding: 0.125rem 0.375rem;
    border-radius: var(--radius-sm);
    font-family: var(--font-mono);
    font-size: 0.875em;
}

/* Limitations Box */
.limitations-box {
    background: rgba(245, 158, 11, 0.05);
    border: 1px solid rgba(245, 158, 11, 0.3);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
}

.limitations-title {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
    color: var(--warning-color);
    margin-bottom: 0.75rem;
}

.limitations-list {
    color: var(--text-secondary);
}

.limitations-list li {
    padding-left: 1.5rem;
    position: relative;
    margin-bottom: 0.5rem;
}

.limitations-list li::before {
    content: '•';
    position: absolute;
    left: 0.5rem;
    color: var(--warning-color);
}

/* Footer */
.footer {
    background: var(--text-primary);
    color: rgba(255, 255, 255, 0.7);
    padding: 4rem 0 2rem;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.footer-brand {
    grid-column: span 2;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.25rem;
    font-weight: 700;
    color: white;
    margin-bottom: 1rem;
}

.footer-description {
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.9375rem;
    line-height: 1.6;
    max-width: 300px;
}

.footer-title {
    font-size: 1rem;
    font-weight: 600;
    color: white;
    margin-bottom: 1rem;
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.footer-link {
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.9375rem;
    transition: color var(--transition-fast);
}

.footer-link:hover {
    color: white;
}

.footer-social {
    display: flex;
    gap: 0.75rem;
    margin-top: 1rem;
}

.social-link {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: rgba(255, 255, 255, 0.7);
    transition: all var(--transition-fast);
}

.social-link:hover {
    background: var(--primary-color);
    color: white;
}

.social-link svg {
    width: 20px;
    height: 20px;
}

.footer-bottom {
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.footer-copyright {
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.5);
}

.footer-legal {
    display: flex;
    gap: 1.5rem;
}

.footer-legal a {
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.5);
}

.footer-legal a:hover {
    color: white;
}

/* Guide Pages */
.guide-content {
    max-width: 800px;
    margin: 0 auto;
}

.guide-header {
    margin-bottom: 2rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--border-color);
}

.guide-title {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.guide-meta {
    display: flex;
    gap: 1.5rem;
    color: var(--text-muted);
    font-size: 0.875rem;
}

.guide-body {
    line-height: 1.8;
}

.guide-body h2 {
    margin-top: 2.5rem;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border-color);
}

.guide-body h3 {
    margin-top: 2rem;
    margin-bottom: 0.75rem;
}

.guide-body p {
    margin-bottom: 1.25rem;
}

.guide-body ul,
.guide-body ol {
    margin-bottom: 1.25rem;
    padding-left: 1.5rem;
}

.guide-body li {
    margin-bottom: 0.5rem;
    list-style: disc;
}

.guide-body ol li {
    list-style: decimal;
}

/* Glossary */
.glossary-search {
    margin-bottom: 2rem;
}

.glossary-search-input {
    width: 100%;
    padding: 1rem 1.25rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    font-size: 1rem;
}

.glossary-section {
    margin-bottom: 2rem;
}

.glossary-letter {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--primary-color);
    margin-bottom: 1rem;
}

.glossary-term {
    padding: 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    margin-bottom: 0.75rem;
}

.glossary-term-title {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.glossary-term-definition {
    color: var(--text-secondary);
    font-size: 0.9375rem;
}

/* Legal Pages */
.legal-content {
    max-width: 800px;
    margin: 0 auto;
}

.legal-header {
    margin-bottom: 2rem;
}

.legal-title {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

.legal-updated {
    color: var(--text-muted);
    font-size: 0.875rem;
}

.legal-body {
    line-height: 1.8;
}

.legal-body h2 {
    margin-top: 2rem;
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

.legal-body p {
    margin-bottom: 1rem;
}

.legal-body ul {
    padding-left: 1.5rem;
    margin-bottom: 1rem;
}

.legal-body li {
    list-style: disc;
    margin-bottom: 0.5rem;
}

/* Contact Page */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
}

.contact-info h2 {
    margin-bottom: 1rem;
}

.contact-item {
    display: flex;
    gap: 1rem;
    padding: 1rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    margin-bottom: 1rem;
}

.contact-icon {
    width: 48px;
    height: 48px;
    background: var(--primary-color);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    flex-shrink: 0;
}

.contact-icon svg {
    width: 24px;
    height: 24px;
}

.contact-label {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-bottom: 0.25rem;
}

.contact-value {
    font-weight: 500;
    color: var(--text-primary);
}

/* Utility Classes */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }

.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }

.hidden { display: none !important; }

/* Responsive Design */
@media (max-width: 1024px) {
    .footer-brand {
        grid-column: span 1;
    }
}

@media (max-width: 768px) {
    :root {
        --header-height: 64px;
    }
    
    .nav {
        display: none;
    }
    
    .menu-toggle {
        display: flex;
    }
    
    .hero {
        padding: 3rem 0;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-description {
        font-size: 1rem;
    }
    
    .section {
        padding: 3rem 0;
    }
    
    .section-title {
        font-size: 1.5rem;
    }
    
    .content-section {
        padding: 1.5rem;
    }
    
    .formula {
        font-size: 1.125rem;
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
    
    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
    
    h1 { font-size: 2rem; }
    h2 { font-size: 1.5rem; }
    h3 { font-size: 1.25rem; }
}

@media (max-width: 480px) {
    .container {
        padding: 0 1rem;
    }

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

    .btn {
        width: 100%;
    }

    .calc-row {
        grid-template-columns: 1fr;
    }

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

    .footer-legal {
        flex-direction: column;
        gap: 0.5rem;
        align-items: center;
    }

    /* Motion calculator mobile styles */
    .calc-group .input-with-unit {
        flex-direction: column;
        gap: 0.5rem;
    }

    .calc-group .input-with-unit .calc-input {
        width: 100%;
    }

    .calc-group .input-with-unit .calc-select {
        width: 100%;
    }

    .calc-select {
        min-width: 0;
        width: 100%;
    }

    .calc-input {
        min-width: 0;
        width: 100%;
    }
}

/* ===================================
   Contact Page Styles
   =================================== */
.contact-card {
    background: linear-gradient(135deg, var(--primary-color), #1d4ed8);
    color: white;
    padding: 3rem;
    border-radius: 16px;
    text-align: center;
    margin-bottom: 2rem;
}

.contact-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
}

.contact-card h2 {
    color: white;
    border: none;
    padding: 0;
    margin-bottom: 1rem;
}

.contact-card p {
    opacity: 0.9;
    margin-bottom: 2rem;
}

.contact-email {
    margin-top: 1.5rem;
}

.email-link {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    background: white;
    color: var(--primary-color);
    padding: 1rem 2rem;
    border-radius: 50px;
    font-size: 1.25rem;
    font-weight: 600;
    text-decoration: none;
    transition: transform 0.2s, box-shadow 0.2s;
}

.email-link:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
}

.contact-tips {
    display: grid;
    gap: 1rem;
    margin-top: 1.5rem;
}

.tip-item {
    display: flex;
    gap: 1rem;
    padding: 1.25rem;
    background: var(--bg-secondary);
    border-radius: 12px;
    align-items: flex-start;
}

.tip-icon {
    font-size: 1.5rem;
    flex-shrink: 0;
}

.tip-content h4 {
    margin: 0 0 0.25rem 0;
    color: var(--text-primary);
}

.tip-content p {
    margin: 0;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.inquiry-types {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1rem;
    margin-top: 1.5rem;
}

.inquiry-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem 1.25rem;
    background: var(--bg-secondary);
    border-radius: 10px;
}

.inquiry-icon {
    font-size: 1.25rem;
}

.social-links-contact {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin-top: 1.5rem;
}

.social-link-contact {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    background: var(--bg-secondary);
    border-radius: 50px;
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 500;
    transition: background 0.2s, transform 0.2s;
}

.social-link-contact:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-2px);
}

.social-icon {
    font-size: 1.25rem;
}