/* ==================== CSS Variables ==================== */
:root {
    --primary: #0f766e;
    --primary-dark: #115e59;
    --primary-light: #14b8a6;
    --secondary: #22c55e;
    --accent: #f97316;

    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-tertiary: #e9ecef;
    --bg-elevated: #ffffff;

    --text-primary: #1a202c;
    --text-secondary: #4a5568;
    --text-tertiary: #718096;

    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.15);

    --success: #48bb78;
    --error: #f56565;
    --warning: #ed8936;

    --gradient-primary: linear-gradient(135deg, #0f766e 0%, #22c55e 100%);
    --gradient-secondary: linear-gradient(135deg, #f97316 0%, #e11d48 100%);
    --gradient-success: linear-gradient(135deg, #22c55e 0%, #16a34a 100%);

    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Courier New', monospace;
    --font-hindi: 'Noto Sans Devanagari', 'Nirmala UI', 'Mangal', system-ui, sans-serif;

    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;

    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;

    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --bg-elevated: #1e293b;

    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-tertiary: #94a3b8;

    --border-color: #334155;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.6);
}

/* ==================== Reset & Base ==================== */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

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

/* ==================== Navigation ==================== */
.navbar {
    background: var(--bg-elevated);
    border-bottom: 1px solid var(--border-color);
    padding: var(--spacing-md) 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.5rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-decoration: none;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-sm);
}

.nav-link {
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: var(--radius-md);
    font-weight: 500;
    transition: all var(--transition-fast);
}

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

.theme-toggle {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-sm);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    color: var(--text-primary);
}

.theme-toggle:hover { background: var(--bg-tertiary); transform: scale(1.05); }
.moon-icon { display: none; }
[data-theme="dark"] .sun-icon { display: none; }
[data-theme="dark"] .moon-icon { display: block; }

/* ==================== Page Content ==================== */
.main-content {
    flex: 1;
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-2xl) var(--spacing-lg);
    width: 100%;
}

/* ==================== Hero ==================== */
.hero {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.hero h1 {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: var(--spacing-md);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

/* ==================== Buttons ==================== */
.btn-primary, .btn-secondary {
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all var(--transition-fast);
    border: none;
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-family: var(--font-primary);
    text-decoration: none;
}

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

.btn-primary:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); }
.btn-primary:active { transform: translateY(0); }

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

.btn-secondary:hover { background: var(--bg-tertiary); transform: translateY(-2px); }
.btn-large { padding: var(--spacing-lg) var(--spacing-2xl); font-size: 1.125rem; }

/* ==================== Cards ==================== */
.card {
    background: var(--bg-elevated);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

.card:hover { transform: translateY(-5px); box-shadow: var(--shadow-xl); }

/* ==================== Grid Layouts ==================== */
.grid-2 { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: var(--spacing-xl); }
.grid-3 { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: var(--spacing-xl); }
.grid-4 { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: var(--spacing-xl); }

/* ==================== Info Sections ==================== */
.info-section {
    background: var(--bg-elevated);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    box-shadow: var(--shadow-lg);
    margin-bottom: var(--spacing-xl);
}

.info-section h2 {
    font-size: 1.75rem;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.info-section p {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: var(--spacing-md);
}

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

.info-section ul li {
    padding: var(--spacing-sm) 0;
    color: var(--text-secondary);
    padding-left: var(--spacing-lg);
    position: relative;
}

.info-section ul li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--primary);
    font-weight: 700;
}

/* ==================== Breadcrumb ==================== */
.breadcrumb {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xl);
    font-size: 0.875rem;
    color: var(--text-tertiary);
    flex-wrap: wrap;
}

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

.breadcrumb a:hover { opacity: 0.8; }
.breadcrumb span { color: var(--text-tertiary); }

/* ==================== Test Box ==================== */
.test-box {
    background: var(--bg-elevated);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    box-shadow: var(--shadow-lg);
    position: relative;
    overflow: hidden;
    margin-bottom: var(--spacing-xl);
}

.test-box::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 4px;
    background: var(--gradient-primary);
}

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

.timer {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
}

.live-stats { display: flex; gap: var(--spacing-xl); }

.live-stat { display: flex; flex-direction: column; align-items: center; }

.stat-label {
    font-size: 0.75rem;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 600;
}

.stat-value { font-size: 1.5rem; font-weight: 700; color: var(--text-primary); }

.text-display {
    font-family: var(--font-mono);
    font-size: 1.25rem;
    line-height: 2;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-xl);
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    min-height: 200px;
    user-select: none;
    letter-spacing: 0.02em;
}

.text-display .char { position: relative; transition: color var(--transition-fast); }
.text-display .char.correct { color: var(--success); }
.text-display .char.incorrect { color: var(--error); background: rgba(245, 101, 101, 0.1); border-radius: 2px; }
.text-display .char.current { background: var(--primary); color: white; border-radius: 2px; animation: blink 1s infinite; }

@keyframes blink { 0%, 50% { opacity: 1; } 51%, 100% { opacity: 0.3; } }

.input-container { margin-bottom: var(--spacing-xl); }

.typing-input {
    width: 100%;
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: 1.125rem;
    font-family: var(--font-mono);
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    color: var(--text-primary);
    transition: all var(--transition-fast);
}

.text-display.hindi-text {
    font-family: var(--font-hindi);
    font-size: 1.35rem;
    line-height: 2.1;
    letter-spacing: 0.01em;
}

.typing-input.hindi-input {
    font-family: var(--font-hindi);
}

.typing-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.test-controls {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
}

.config-panel {
    background: var(--bg-elevated);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    display: flex;
    gap: var(--spacing-2xl);
    justify-content: center;
    flex-wrap: wrap;
    box-shadow: var(--shadow-md);
}

.config-group { display: flex; flex-direction: column; gap: var(--spacing-md); }

.config-group label {
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.button-group { display: flex; gap: var(--spacing-sm); }

.config-btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: var(--font-primary);
    font-size: 0.9375rem;
}

.config-btn:hover { background: var(--bg-tertiary); transform: translateY(-2px); box-shadow: var(--shadow-sm); }
.config-btn.active { background: var(--gradient-primary); color: white; border-color: transparent; box-shadow: var(--shadow-md); }

/* ==================== Progress Bar ==================== */
.progress-bar {
    width: 100%;
    height: 8px;
    background: var(--bg-secondary);
    border-radius: 999px;
    overflow: hidden;
    margin-bottom: var(--spacing-sm);
}

.progress-fill {
    height: 100%;
    background: var(--gradient-primary);
    transition: width var(--transition-slow);
}

/* ==================== Badge ==================== */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 0.25rem 0.75rem;
    border-radius: 999px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.badge-primary { background: rgba(102, 126, 234, 0.15); color: var(--primary); }
.badge-success { background: rgba(72, 187, 120, 0.15); color: var(--success); }
.badge-warning { background: rgba(237, 137, 54, 0.15); color: var(--warning); }

/* ==================== Stats Row ==================== */
.stats-row {
    display: flex;
    gap: var(--spacing-xl);
    flex-wrap: wrap;
    margin-bottom: var(--spacing-xl);
}

.stat-item {
    flex: 1;
    min-width: 120px;
    background: var(--bg-elevated);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    text-align: center;
    box-shadow: var(--shadow-sm);
}

.stat-item .stat-number {
    font-size: 2rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-item .stat-desc {
    font-size: 0.875rem;
    color: var(--text-tertiary);
    margin-top: var(--spacing-xs);
}

/* ==================== Keyboard Visual ==================== */
.keyboard-visual {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    margin: var(--spacing-xl) 0;
    font-family: var(--font-mono);
}

.key-row {
    display: flex;
    gap: 0.3rem;
    justify-content: center;
    margin-bottom: 0.3rem;
}

.key {
    padding: 0.5rem 0.75rem;
    background: var(--bg-elevated);
    border: 1px solid var(--border-color);
    border-bottom: 3px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    font-weight: 600;
    min-width: 2.5rem;
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-fast);
}

.key.highlight {
    background: var(--gradient-primary);
    color: white;
    border-color: transparent;
    box-shadow: var(--shadow-md);
}

/* ==================== FAQ Section ==================== */
.faq-section { margin: var(--spacing-2xl) 0; }

.faq-section h2 {
    font-size: 1.75rem;
    margin-bottom: var(--spacing-xl);
    text-align: center;
}

.faq-item {
    background: var(--bg-elevated);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-md);
    overflow: hidden;
    transition: box-shadow var(--transition-fast);
}

.faq-item:hover { box-shadow: var(--shadow-md); }

.faq-question {
    padding: var(--spacing-lg) var(--spacing-xl);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 600;
    color: var(--text-primary);
    gap: var(--spacing-md);
}

.faq-question::after {
    content: '+';
    font-size: 1.5rem;
    color: var(--primary);
    flex-shrink: 0;
    transition: transform var(--transition-fast);
}

.faq-item.open .faq-question::after { transform: rotate(45deg); }

.faq-answer {
    display: none;
    padding: 0 var(--spacing-xl) var(--spacing-lg);
    color: var(--text-secondary);
    line-height: 1.8;
    border-top: 1px solid var(--border-color);
}

.faq-item.open .faq-answer { display: block; }

/* ==================== Feature Grid ==================== */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: var(--spacing-xl);
    margin: var(--spacing-2xl) 0;
}

.feature-card {
    background: var(--bg-elevated);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

.feature-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-xl); border-color: var(--primary); }

.feature-icon { font-size: 2.5rem; margin-bottom: var(--spacing-md); }

.feature-card h3 { font-size: 1.125rem; margin-bottom: var(--spacing-sm); color: var(--text-primary); }

.feature-card p { color: var(--text-secondary); font-size: 0.9375rem; line-height: 1.6; }

/* ==================== Footer ==================== */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: var(--spacing-2xl) 0 var(--spacing-md);
    margin-top: auto;
}

.footer-top {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg) var(--spacing-2xl);
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr 1fr;
    gap: var(--spacing-2xl);
    border-bottom: 1px solid var(--border-color);
}

.footer-brand .logo-text {
    font-size: 1.5rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: block;
    margin-bottom: var(--spacing-md);
}

.footer-brand p {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    line-height: 1.7;
    margin-bottom: var(--spacing-lg);
}

.footer-socials { display: flex; gap: var(--spacing-md); }

.social-link {
    width: 36px;
    height: 36px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    text-decoration: none;
    transition: all var(--transition-fast);
    font-size: 1rem;
}

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

.footer-col h4 {
    font-size: 0.875rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-primary);
    margin-bottom: var(--spacing-lg);
}

.footer-col ul { list-style: none; }

.footer-col ul li { margin-bottom: var(--spacing-sm); }

.footer-col ul li a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9375rem;
    transition: color var(--transition-fast);
    display: inline-block;
}

.footer-col ul li a:hover { color: var(--primary); transform: translateX(2px); }

.footer-bottom {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-lg) var(--spacing-lg) 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.footer-bottom p { color: var(--text-tertiary); font-size: 0.875rem; }

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

.footer-bottom-links a {
    color: var(--text-tertiary);
    text-decoration: none;
    font-size: 0.875rem;
    transition: color var(--transition-fast);
}

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

/* ==================== Responsive ==================== */
@media (max-width: 1024px) {
    .footer-top { grid-template-columns: 1fr 1fr 1fr; }
    .footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 768px) {
    .hero h1 { font-size: 2rem; }
    .nav-menu { display: none; }
    .footer-top { grid-template-columns: 1fr 1fr; }
    .footer-brand { grid-column: 1 / -1; }
    .footer-bottom { flex-direction: column; text-align: center; }
    .test-header { flex-direction: column; gap: var(--spacing-md); }
}

@media (max-width: 480px) {
    .footer-top { grid-template-columns: 1fr; }
    .footer-brand { grid-column: 1; }
    .hero h1 { font-size: 1.75rem; }
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.page-fade { animation: fadeIn var(--transition-base); }