/* ==========================================================================
   PyQJunction — Student-First Design System
   Modern, Accessible, Responsive Education UI
   Light & Dark Theme with Zero Flash
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Theme Tokens & CSS Custom Properties
   -------------------------------------------------------------------------- */
:root,
[data-theme="light"] {
    /* Color System - Light (Calm Slate & Emerald) */
    --bg: #f8fafc;
    --bg-subtle: #f1f5f9;
    --surface: #ffffff;
    --surface-hover: #f8fafc;
    --surface-card: #ffffff;
    --surface-sunken: #f1f5f9;
    --surface-elevated: #ffffff;

    --border: #e2e8f0;
    --border-strong: #cbd5e1;
    --border-subtle: #f1f5f9;

    --text: #0f172a;
    --text2: #334155;
    --text3: #64748b;
    --text4: #94a3b8;

    /* Accent & Brand Colors */
    --green: #16a34a;
    --green-hover: #15803d;
    --green-dk: #ffffff;
    --green-soft: rgba(22, 163, 74, 0.09);
    --green-border: rgba(22, 163, 74, 0.25);

    --blue: #2563eb;
    --blue-soft: rgba(37, 99, 235, 0.08);
    --purple: #7c3aed;
    --purple-soft: rgba(124, 58, 237, 0.08);
    --amber: #d97706;
    --amber-soft: rgba(217, 119, 6, 0.09);
    --red: #dc2626;
    --red-soft: rgba(220, 38, 38, 0.08);

    /* UI Elevation & Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(15, 23, 42, 0.05);
    --shadow: 0 4px 12px -2px rgba(15, 23, 42, 0.06), 0 2px 6px -1px rgba(15, 23, 42, 0.03);
    --shadow-md: 0 10px 20px -3px rgba(15, 23, 42, 0.08), 0 4px 8px -2px rgba(15, 23, 42, 0.04);
    --shadow-lg: 0 20px 25px -5px rgba(15, 23, 42, 0.1), 0 8px 10px -6px rgba(15, 23, 42, 0.04);
    --shadow-card-hover: 0 12px 28px -4px rgba(15, 23, 42, 0.1), 0 4px 10px -2px rgba(15, 23, 42, 0.05);

    --navbar-bg: rgba(255, 255, 255, 0.92);
    --navbar-border: #e2e8f0;
    --footer-bg: #f1f5f9;
    --footer-border: #e2e8f0;

    --badge-bg: #f1f5f9;
    --badge-text: #475569;
    --badge-border: #e2e8f0;

    --focus-ring: 0 0 0 3px rgba(22, 163, 74, 0.25);
    --code-bg: #f1f5f9;
    --table-stripe: #f8fafc;
    --table-header-bg: #f1f5f9;

    --cta-bg: linear-gradient(135deg, #ffffff 0%, #f0fdf4 100%);
    --cta-border: #bbf7d0;
}

[data-theme="dark"] {
    /* Color System - Dark (Deep Slate Navy & Emerald Accent) */
    --bg: #0b0f19;
    --bg-subtle: #111827;
    --surface: #111827;
    --surface-hover: #172033;
    --surface-card: #111827;
    --surface-sunken: #070c14;
    --surface-elevated: #1e293b;

    --border: #1f293d;
    --border-strong: #334155;
    --border-subtle: #162032;

    --text: #f8fafc;
    --text2: #cbd5e1;
    --text3: #94a3b8;
    --text4: #64748b;

    /* Accent & Brand Colors */
    --green: #22c55e;
    --green-hover: #4ade80;
    --green-dk: #052e16;
    --green-soft: rgba(34, 197, 94, 0.12);
    --green-border: rgba(34, 197, 94, 0.3);

    --blue: #38bdf8;
    --blue-soft: rgba(56, 189, 248, 0.1);
    --purple: #a78bfa;
    --purple-soft: rgba(167, 139, 250, 0.1);
    --amber: #fbbf24;
    --amber-soft: rgba(251, 191, 36, 0.12);
    --red: #f87171;
    --red-soft: rgba(248, 113, 113, 0.12);

    /* UI Elevation & Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow: 0 4px 16px -2px rgba(0, 0, 0, 0.45);
    --shadow-md: 0 10px 24px -3px rgba(0, 0, 0, 0.55);
    --shadow-lg: 0 20px 30px -5px rgba(0, 0, 0, 0.65);
    --shadow-card-hover: 0 14px 30px -4px rgba(0, 0, 0, 0.65), 0 0 20px rgba(34, 197, 94, 0.08);

    --navbar-bg: rgba(11, 15, 25, 0.92);
    --navbar-border: #1f293d;
    --footer-bg: #070a12;
    --footer-border: #1f293d;

    --badge-bg: rgba(255, 255, 255, 0.05);
    --badge-text: #94a3b8;
    --badge-border: #1f293d;

    --focus-ring: 0 0 0 3px rgba(34, 197, 94, 0.3);
    --code-bg: #070c14;
    --table-stripe: #0e1422;
    --table-header-bg: #141c2e;

    --cta-bg: linear-gradient(135deg, #0d1624 0%, #062419 100%);
    --cta-border: #166534;
}

/* Base Typography & Dimensional Tokens */
:root {
    --font: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    
    --radius-sm: 8px;
    --radius: 12px;
    --radius-lg: 16px;
    --radius-pill: 9999px;

    --transition-fast: 0.15s ease;
    --transition: 0.2s cubic-bezier(0.16, 1, 0.3, 1);
    --transition-smooth: 0.3s cubic-bezier(0.16, 1, 0.3, 1);

    --header-height: 64px;
}

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

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
    text-size-adjust: 100%;
    max-width: 100%;
    overflow-x: hidden;
}

body {
    font-family: var(--font);
    background-color: var(--bg);
    color: var(--text);
    font-size: 15px;
    line-height: 1.65;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
    max-width: 100%;
    overflow-x: hidden;
    transition: background-color var(--transition-smooth), color var(--transition-smooth);
}

a {
    color: var(--green);
    text-decoration: none;
    transition: color var(--transition-fast), opacity var(--transition-fast);
}
a:hover {
    opacity: 0.88;
}

img, svg, video, iframe, embed, object {
    max-width: 100%;
    height: auto;
    display: block;
}

::selection {
    background: var(--green-soft);
    color: var(--text);
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}
::-webkit-scrollbar-track {
    background: var(--bg);
}
::-webkit-scrollbar-thumb {
    background: var(--border-strong);
    border-radius: var(--radius-pill);
}
::-webkit-scrollbar-thumb:hover {
    background: var(--text3);
}

/* Accessibility: Skip to Content */
.skip-link {
    position: absolute;
    top: -100px;
    left: 16px;
    background: var(--green);
    color: var(--green-dk);
    padding: 10px 18px;
    border-radius: var(--radius-sm);
    font-weight: 700;
    z-index: 9999;
    text-decoration: none;
    box-shadow: var(--shadow-md);
    transition: top 0.2s ease;
}
.skip-link:focus {
    top: 16px;
    outline: 2px solid var(--text);
}

/* Focus Visible Utility */
:focus-visible {
    outline: none;
    box-shadow: var(--focus-ring);
}

/* --------------------------------------------------------------------------
   3. Layout Containers
   -------------------------------------------------------------------------- */
.container {
    width: 100%;
    max-width: 1140px;
    margin: 0 auto;
    padding: 0 24px;
}

.main-content {
    min-height: calc(100vh - var(--header-height) - 180px);
    padding-top: var(--header-height);
}

/* --------------------------------------------------------------------------
   4. Header & Navigation
   -------------------------------------------------------------------------- */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    height: var(--header-height);
    background: var(--navbar-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--navbar-border);
    transition: background-color var(--transition-smooth), border-color var(--transition-smooth);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
    max-width: 1140px;
    margin: 0 auto;
    padding: 0 24px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--text);
    font-weight: 800;
    font-size: 1.2rem;
    letter-spacing: -0.4px;
    flex-shrink: 0;
}
.logo:hover {
    opacity: 1;
    color: var(--text);
    text-decoration: none;
}

.logo-img {
    height: 32px;
    width: auto;
    max-height: 32px;
    object-fit: contain;
    border-radius: 4px;
    flex-shrink: 0;
    display: inline-block;
    vertical-align: middle;
}

.footer .logo-img {
    height: 36px;
    max-height: 36px;
}

.logo-icon {
    width: 36px;
    height: 36px;
    border-radius: 10px;
    background: linear-gradient(135deg, var(--green), #3b82f6);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    box-shadow: 0 2px 10px rgba(34, 197, 94, 0.25);
    flex-shrink: 0;
}

.logo .accent {
    color: var(--green);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 4px;
}

.nav-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 14px;
    border-radius: var(--radius-sm);
    text-decoration: none;
    color: var(--text2);
    font-weight: 600;
    font-size: 0.88rem;
    transition: var(--transition-fast);
}
.nav-link:hover {
    color: var(--text);
    background: var(--surface-hover);
    text-decoration: none;
}
.nav-link.active {
    color: var(--green);
    background: var(--green-soft);
    font-weight: 700;
}

.nav-link-highlight {
    background: var(--green-soft);
    color: var(--green) !important;
    font-weight: 700;
    border: 1px solid var(--green-border);
}
.nav-link-highlight:hover {
    background: var(--green) !important;
    color: var(--green-dk) !important;
}

/* Theme Toggle Button */
.theme-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text2);
    cursor: pointer;
    transition: var(--transition-fast);
    padding: 0;
    flex-shrink: 0;
}
.theme-toggle:hover {
    color: var(--text);
    border-color: var(--border-strong);
    background: var(--surface-hover);
}

.theme-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    line-height: 1;
    transition: transform var(--transition-smooth), opacity var(--transition-fast);
}

/* Show sun in dark mode and moon in light mode */
[data-theme="dark"] .theme-icon-sun {
    display: inline-flex;
}
[data-theme="dark"] .theme-icon-moon {
    display: none;
}
:root:not([data-theme="dark"]) .theme-icon-sun,
[data-theme="light"] .theme-icon-sun {
    display: none;
}
:root:not([data-theme="dark"]) .theme-icon-moon,
[data-theme="light"] .theme-icon-moon {
    display: inline-flex;
}

/* Mobile Hamburger Toggle */
.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
    width: 40px;
    height: 40px;
    background: transparent;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    padding: 0;
    transition: var(--transition-fast);
    flex-shrink: 0;
}
.nav-toggle:hover {
    background: var(--surface-hover);
    border-color: var(--border-strong);
}

.nav-toggle-line {
    display: block;
    width: 18px;
    height: 2px;
    background: var(--text);
    border-radius: 2px;
    transition: transform var(--transition), opacity var(--transition-fast);
}
.nav-toggle.active .nav-toggle-line:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}
.nav-toggle.active .nav-toggle-line:nth-child(2) {
    opacity: 0;
}
.nav-toggle.active .nav-toggle-line:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* --------------------------------------------------------------------------
   5. Hero Section
   -------------------------------------------------------------------------- */
.hero {
    text-align: center;
    padding: 56px 0 48px;
    position: relative;
}

.hero-home {
    padding: 68px 0 56px;
    position: relative;
    overflow: hidden;
}

.hero-home::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse 70% 50% at 50% -15%, var(--green-soft), transparent),
        radial-gradient(ellipse 50% 40% at 90% 40%, var(--blue-soft), transparent),
        radial-gradient(ellipse 45% 35% at 10% 70%, var(--purple-soft), transparent);
    pointer-events: none;
}

.hero-inner {
    position: relative;
    z-index: 1;
    max-width: 780px;
    margin: 0 auto;
}

.hero-chip-row {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    justify-content: center;
    margin-bottom: 22px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 14px;
    border-radius: var(--radius-pill);
    background: var(--surface);
    border: 1px solid var(--amber-soft);
    color: var(--amber);
    font-size: 0.78rem;
    font-weight: 700;
    box-shadow: var(--shadow-sm);
}

.hero-badge-soft {
    border-color: var(--border) !important;
    color: var(--text3) !important;
    background: var(--surface) !important;
}

.hero h1 {
    font-size: clamp(2rem, 5.2vw, 3.2rem);
    font-weight: 900;
    letter-spacing: -1.2px;
    line-height: 1.16;
    margin-bottom: 16px;
    color: var(--text);
}

.hero h1 .grad {
    background: linear-gradient(135deg, var(--green) 0%, #3b82f6 50%, #8b5cf6 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-lead {
    font-size: 1.06rem;
    color: var(--text3);
    line-height: 1.75;
    max-width: 640px;
    margin: 0 auto 32px;
}

.hero-actions {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 40px;
}

.hero-pyq-btn {
    box-shadow: 0 4px 16px rgba(34, 197, 94, 0.35);
    background: linear-gradient(135deg, var(--green), #15803d);
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 40px;
    flex-wrap: wrap;
    padding-top: 12px;
}

.stat-item {
    text-align: center;
}
.stat-num {
    display: block;
    font-size: 1.45rem;
    font-weight: 900;
    color: var(--text);
    letter-spacing: -0.5px;
}
.stat-label {
    font-size: 0.74rem;
    color: var(--text4);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-top: 2px;
}

/* --------------------------------------------------------------------------
   6. Buttons
   -------------------------------------------------------------------------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 11px 22px;
    border-radius: var(--radius-sm);
    font-family: var(--font);
    font-weight: 700;
    font-size: 0.92rem;
    text-decoration: none;
    border: 1px solid transparent;
    cursor: pointer;
    transition: var(--transition-fast);
    min-height: 44px;
    line-height: 1;
}

.btn:hover {
    text-decoration: none;
    transform: translateY(-1px);
}

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

.btn-primary {
    background: var(--green);
    color: var(--green-dk);
    box-shadow: 0 2px 8px rgba(34, 197, 94, 0.25);
}
.btn-primary:hover {
    background: var(--green-hover);
    color: var(--green-dk);
    box-shadow: 0 4px 14px rgba(34, 197, 94, 0.35);
}

.btn-secondary {
    background: var(--surface);
    border-color: var(--border-strong);
    color: var(--text2);
    box-shadow: var(--shadow-sm);
}
.btn-secondary:hover {
    border-color: var(--text3);
    color: var(--text);
    background: var(--surface-hover);
}

.btn-outline {
    background: transparent;
    color: var(--green);
    border: 1.5px solid var(--green-border);
}
.btn-outline:hover {
    background: var(--green-soft);
    border-color: var(--green);
    color: var(--green);
}

.btn-light-secondary {
    background: var(--surface-sunken);
    color: var(--text2);
    border: 1px solid var(--border);
}
.btn-light-secondary:hover {
    border-color: var(--border-strong);
    color: var(--text);
}

.btn-lg {
    padding: 14px 28px;
    font-size: 1rem;
    border-radius: var(--radius);
}

/* --------------------------------------------------------------------------
   7. Sections & Page Headers
   -------------------------------------------------------------------------- */
.section {
    padding: 56px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 36px;
}
.section-header h2 {
    font-size: 1.65rem;
    font-weight: 800;
    letter-spacing: -0.5px;
    margin-bottom: 8px;
    color: var(--text);
}
.section-header p {
    color: var(--text3);
    font-size: 0.98rem;
    max-width: 560px;
    margin: 0 auto;
}

.section-eyebrow {
    font-size: 0.74rem;
    font-weight: 800;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--green);
    margin-bottom: 8px;
}

.page-header {
    padding: 48px 0 28px;
    text-align: center;
}
.page-header h1 {
    font-size: clamp(1.75rem, 4.5vw, 2.5rem);
    font-weight: 900;
    letter-spacing: -0.7px;
    margin-bottom: 10px;
    color: var(--text);
}
.page-header p {
    color: var(--text3);
    font-size: 1.02rem;
    max-width: 580px;
    margin: 0 auto;
    line-height: 1.65;
}

/* --------------------------------------------------------------------------
   8. Cards & Grid System
   -------------------------------------------------------------------------- */
.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 20px;
}

.card {
    background: var(--surface-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 22px;
    transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
    text-decoration: none;
    color: inherit;
    display: flex;
    flex-direction: column;
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.card:hover {
    transform: translateY(-4px);
    border-color: var(--border-strong);
    box-shadow: var(--shadow-card-hover);
    text-decoration: none;
    color: inherit;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--card-color, var(--green));
    opacity: 0.85;
}

/* Featured PYQ Card CTA in Grids */
.card-featured-pyq {
    background: var(--cta-bg) !important;
    border: 1.5px solid var(--cta-border) !important;
    box-shadow: 0 4px 16px rgba(34, 197, 94, 0.15);
}
.card-featured-pyq:hover {
    box-shadow: 0 10px 25px rgba(34, 197, 94, 0.25) !important;
}
.card-featured-pyq .card-icon {
    color: var(--green);
}

.card-icon {
    font-size: 2rem;
    margin-bottom: 14px;
    line-height: 1;
}

.card-title {
    font-size: 1.08rem;
    font-weight: 800;
    margin-bottom: 8px;
    color: var(--text);
    line-height: 1.35;
    letter-spacing: -0.2px;
}

.card-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 12px;
}

.badge {
    display: inline-flex;
    align-items: center;
    padding: 3px 9px;
    border-radius: var(--radius-pill);
    font-size: 0.72rem;
    font-weight: 700;
    background: var(--badge-bg);
    color: var(--badge-text);
    border: 1px solid var(--badge-border);
    line-height: 1.3;
}

.badge-accent {
    background: var(--green-soft) !important;
    color: var(--green) !important;
    border-color: var(--green-border) !important;
}

.card-desc {
    font-size: 0.87rem;
    color: var(--text3);
    flex-grow: 1;
    margin-bottom: 16px;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
    line-height: 1.6;
}

.card-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 0.78rem;
    color: var(--text4);
    font-weight: 600;
    border-top: 1px solid var(--border-subtle);
    padding-top: 12px;
}
.card-arrow {
    color: var(--green);
    font-weight: 700;
    transition: transform var(--transition);
}
.card:hover .card-arrow {
    transform: translateX(4px);
}

/* --------------------------------------------------------------------------
   9. PYQ Practice CTA Section (Global Above-Footer Component)
   -------------------------------------------------------------------------- */
.pyq-cta-section {
    padding: 48px 0 20px;
}

.pyq-cta-box {
    background: var(--cta-bg);
    border: 1.5px solid var(--cta-border);
    border-radius: var(--radius-lg);
    padding: 36px 40px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 32px;
    box-shadow: var(--shadow-md);
    position: relative;
    overflow: hidden;
}

.pyq-cta-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 4px 12px;
    border-radius: var(--radius-pill);
    background: var(--green-soft);
    color: var(--green);
    font-weight: 800;
    font-size: 0.76rem;
    letter-spacing: 0.04em;
    margin-bottom: 10px;
    border: 1px solid var(--green-border);
}

.pyq-cta-title {
    font-size: 1.65rem;
    font-weight: 900;
    letter-spacing: -0.5px;
    color: var(--text);
    margin-bottom: 8px;
}

.pyq-cta-desc {
    color: var(--text3);
    font-size: 0.98rem;
    max-width: 580px;
    line-height: 1.65;
    margin-bottom: 16px;
}

.pyq-cta-features {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.pyq-feat {
    display: inline-flex;
    align-items: center;
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--text2);
    background: var(--surface);
    border: 1px solid var(--border);
    padding: 4px 10px;
    border-radius: var(--radius-pill);
}

.pyq-cta-action {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    flex-shrink: 0;
}

.pyq-btn {
    white-space: nowrap;
    padding: 14px 28px;
    font-size: 1rem;
    box-shadow: 0 4px 20px rgba(34, 197, 94, 0.35);
}

.pyq-cta-subtext {
    font-size: 0.76rem;
    color: var(--text4);
    font-weight: 600;
}

/* --------------------------------------------------------------------------
   10. Search & Filters
   -------------------------------------------------------------------------- */
.search-box {
    max-width: 520px;
    margin: 0 auto 30px;
    position: relative;
}

.search-box input {
    width: 100%;
    padding: 13px 18px 13px 44px;
    background: var(--surface);
    border: 1.5px solid var(--border);
    border-radius: var(--radius);
    color: var(--text);
    font-family: var(--font);
    font-size: 0.96rem;
    font-weight: 500;
    outline: none;
    transition: var(--transition-fast);
    box-shadow: var(--shadow-sm);
}

.search-box input::placeholder {
    color: var(--text4);
}

.search-box input:focus {
    border-color: var(--green);
    box-shadow: var(--focus-ring);
}

.search-box .search-icon {
    position: absolute;
    left: 15px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 1rem;
    color: var(--text4);
    pointer-events: none;
}

/* Filter Tabs */
.filter-tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    justify-content: center;
    margin-bottom: 30px;
}

.filter-tab {
    display: inline-flex;
    align-items: center;
    padding: 8px 16px;
    border-radius: var(--radius-pill);
    background: var(--surface);
    border: 1px solid var(--border);
    color: var(--text3);
    font-size: 0.84rem;
    font-weight: 700;
    font-family: var(--font);
    cursor: pointer;
    transition: var(--transition-fast);
    min-height: 38px;
}
.filter-tab:hover {
    border-color: var(--border-strong);
    color: var(--text);
}
.filter-tab.active {
    background: var(--green-soft);
    color: var(--green);
    border-color: var(--green-border);
}

/* Filter Bar (Subject tabs for Notes page) */
.filter-bar {
    border-bottom: 1px solid var(--border);
    margin-bottom: 32px;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
}
.filter-bar::-webkit-scrollbar {
    display: none;
}

.filter-bar-inner {
    display: flex;
    gap: 4px;
    min-width: max-content;
    padding-bottom: 2px;
}

.filter-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 16px;
    background: none;
    border: none;
    border-bottom: 2.5px solid transparent;
    color: var(--text3);
    font-family: var(--font);
    font-size: 0.88rem;
    font-weight: 700;
    cursor: pointer;
    transition: var(--transition-fast);
    white-space: nowrap;
}
.filter-btn .fdot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    opacity: 0.6;
    flex-shrink: 0;
}
.filter-btn:hover {
    color: var(--text);
}
.filter-btn.active {
    color: var(--green);
    border-bottom-color: var(--green);
}
.filter-btn.active .fdot {
    opacity: 1;
}
.filter-btn .fcnt {
    font-size: 0.72rem;
    background: var(--surface-sunken);
    color: var(--text4);
    padding: 2px 8px;
    border-radius: var(--radius-pill);
    font-weight: 700;
}
.filter-btn.active .fcnt {
    background: var(--green-soft);
    color: var(--green);
}

/* --------------------------------------------------------------------------
   11. Feature Cards & Roadmaps
   -------------------------------------------------------------------------- */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
    gap: 18px;
}

.feature-card {
    background: var(--surface-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 26px 20px;
    text-align: center;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}
.feature-card:hover {
    border-color: var(--border-strong);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}
.feature-icon {
    font-size: 2rem;
    margin-bottom: 12px;
}
.feature-card h3 {
    font-size: 1.05rem;
    font-weight: 800;
    margin-bottom: 8px;
    color: var(--text);
}
.feature-card p {
    font-size: 0.88rem;
    color: var(--text3);
    line-height: 1.6;
}

.roadmap-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
    gap: 16px;
    margin: 24px 0;
}

.roadmap-item {
    background: var(--surface-sunken);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px 18px;
}
.roadmap-item .ri-icon {
    font-size: 1.6rem;
    margin-bottom: 10px;
}
.roadmap-item h4 {
    font-size: 0.96rem;
    font-weight: 800;
    margin-bottom: 6px;
    color: var(--text);
}
.roadmap-item p {
    font-size: 0.85rem;
    color: var(--text3);
    margin: 0;
    line-height: 1.6;
}

/* --------------------------------------------------------------------------
   12. Content Boxes & Rich Notes Layout
   -------------------------------------------------------------------------- */
.content-box {
    background: var(--surface-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 36px;
    margin-bottom: 32px;
    box-shadow: var(--shadow-sm);
}

.content-box h2 {
    font-size: 1.35rem;
    font-weight: 800;
    margin: 32px 0 12px;
    color: var(--text);
    letter-spacing: -0.3px;
}
.content-box h2:first-child {
    margin-top: 0;
}

.content-box h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin: 22px 0 10px;
    color: var(--text2);
}

.content-box h4 {
    font-size: 0.98rem;
    font-weight: 700;
    margin: 16px 0 8px;
    color: var(--text2);
}

.content-box p,
.content-box li {
    color: var(--text2);
    margin-bottom: 12px;
    line-height: 1.8;
    font-size: 0.96rem;
}

.content-box ul,
.content-box ol {
    padding-left: 24px;
    margin-bottom: 18px;
}

.content-box a {
    color: var(--green);
    font-weight: 600;
}
.content-box a:hover {
    text-decoration: underline;
}

/* Callouts / Highlight Boxes */
.info-box {
    padding: 16px 20px;
    border-radius: var(--radius);
    font-size: 0.94rem;
    line-height: 1.7;
    margin: 20px 0;
}

.info-box-green {
    background: var(--green-soft);
    border: 1px solid var(--green-border);
    color: var(--text);
}
.info-box-green strong {
    color: var(--green);
}

.info-box-amber {
    background: var(--amber-soft);
    border: 1px solid rgba(217, 119, 6, 0.25);
    color: var(--text);
}
.info-box-amber strong {
    color: var(--amber);
}

.info-box-blue {
    background: var(--blue-soft);
    border: 1px solid rgba(37, 99, 235, 0.25);
    color: var(--text);
}
.info-box-blue strong {
    color: var(--blue);
}

.highlight-box {
    background: var(--green-soft);
    border-left: 4px solid var(--green);
    padding: 16px 20px;
    border-radius: var(--radius-sm);
    margin-bottom: 24px;
    font-size: 0.95rem;
    line-height: 1.7;
    color: var(--text);
}

.important {
    background: var(--amber-soft);
    border-left: 4px solid var(--amber);
    padding: 16px 20px;
    border-radius: var(--radius-sm);
    margin: 20px 0;
    font-size: 0.95rem;
    color: var(--text);
}

.pro-tip {
    background: var(--green-soft);
    border-left: 4px solid var(--green);
    padding: 16px 20px;
    border-radius: var(--radius-sm);
    margin: 20px 0;
    font-size: 0.95rem;
    color: var(--text);
}

.syllabus-note {
    background: var(--purple-soft);
    border-left: 4px solid var(--purple);
    padding: 14px 18px;
    border-radius: var(--radius-sm);
    margin: 16px 0;
    font-size: 0.9rem;
    color: var(--text);
}

.diagram-box {
    background: var(--code-bg);
    border: 1.5px dashed var(--border-strong);
    padding: 18px;
    border-radius: var(--radius);
    margin: 20px 0;
    font-family: var(--font-mono);
    font-size: 0.88rem;
    line-height: 1.65;
    white-space: pre;
    overflow-x: auto;
    color: var(--text);
}

code {
    background: var(--code-bg);
    color: var(--text);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 0.88em;
    border: 1px solid var(--border);
}

/* --------------------------------------------------------------------------
   13. Responsive Bulletproof Tables
   -------------------------------------------------------------------------- */
.table-responsive {
    width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    margin: 20px 0;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    background: var(--surface);
    box-shadow: var(--shadow-sm);
}

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.92rem;
    text-align: left;
}

table th {
    background: var(--table-header-bg);
    color: var(--text);
    font-weight: 700;
    padding: 12px 16px;
    border-bottom: 1px solid var(--border-strong);
    white-space: nowrap;
}

table td {
    padding: 12px 16px;
    border-bottom: 1px solid var(--border);
    color: var(--text2);
}

table tr:last-child td {
    border-bottom: none;
}

table tr:nth-child(even) td {
    background: var(--table-stripe);
}

/* --------------------------------------------------------------------------
   14. Exam Detail Page Layout
   -------------------------------------------------------------------------- */
.exam-header {
    display: flex;
    align-items: center;
    gap: 24px;
    margin-bottom: 28px;
    flex-wrap: wrap;
}

.exam-icon-lg {
    font-size: 3.5rem;
    line-height: 1;
    flex-shrink: 0;
}

.exam-info h1 {
    font-size: 2rem;
    font-weight: 900;
    margin-bottom: 6px;
    color: var(--text);
    letter-spacing: -0.5px;
}

.badges {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 8px;
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 14px;
    margin: 24px 0;
}

.info-item {
    background: var(--surface-sunken);
    border-radius: var(--radius);
    padding: 16px;
    border: 1px solid var(--border);
}

.info-item label {
    display: block;
    font-size: 0.72rem;
    color: var(--text4);
    margin-bottom: 4px;
    text-transform: uppercase;
    letter-spacing: 0.6px;
    font-weight: 800;
}

.info-item span {
    font-weight: 700;
    font-size: 1rem;
    color: var(--text);
}

/* --------------------------------------------------------------------------
   15. Forms
   -------------------------------------------------------------------------- */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 7px;
    font-weight: 700;
    font-size: 0.9rem;
    color: var(--text);
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 12px 16px;
    background: var(--surface);
    border: 1.5px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text);
    font-family: var(--font);
    font-size: 0.96rem;
    outline: none;
    transition: var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    border-color: var(--green);
    box-shadow: var(--focus-ring);
}

.form-group textarea {
    min-height: 140px;
    resize: vertical;
}

/* --------------------------------------------------------------------------
   16. Footer & Conducting Bodies Directory
   -------------------------------------------------------------------------- */
.footer {
    background: var(--footer-bg);
    border-top: 1px solid var(--footer-border);
    padding: 56px 0 28px;
    margin-top: 40px;
    transition: background-color var(--transition-smooth), border-color var(--transition-smooth);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 36px;
    margin-bottom: 44px;
}

.footer .logo {
    color: var(--text);
    margin-bottom: 14px;
}

.footer-tagline {
    color: var(--text3);
    font-size: 0.9rem;
    max-width: 320px;
    line-height: 1.65;
}

.footer-links h4 {
    font-size: 0.92rem;
    font-weight: 800;
    margin-bottom: 14px;
    color: var(--text);
    letter-spacing: -0.2px;
}

.footer-links a {
    display: block;
    color: var(--text3);
    text-decoration: none;
    font-size: 0.88rem;
    font-weight: 600;
    margin-bottom: 10px;
    transition: var(--transition-fast);
}
.footer-links a:hover {
    color: var(--green);
}

/* Conducting Bodies Directory */
.footer-conducting-bodies {
    border-top: 1px solid var(--border);
    padding-top: 36px;
    margin-bottom: 36px;
}

.conducting-heading {
    font-size: 1rem;
    font-weight: 800;
    letter-spacing: -0.3px;
    color: var(--text);
    margin-bottom: 20px;
    text-align: center;
}

.conducting-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 24px;
}

.conducting-col h5 {
    font-size: 0.84rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--green);
    margin-bottom: 12px;
}

.conducting-col ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.conducting-col li {
    margin-bottom: 8px;
    font-size: 0.82rem;
}

.conducting-col a {
    color: var(--text3);
    text-decoration: none;
    font-weight: 500;
    transition: color var(--transition-fast);
    display: inline-block;
}
.conducting-col a:hover {
    color: var(--green);
    text-decoration: underline;
}

.footer-bottom {
    border-top: 1px solid var(--border);
    padding-top: 24px;
    text-align: center;
}

.footer-bottom p {
    color: var(--text3);
    font-size: 0.85rem;
}

.footer-note {
    margin-top: 6px;
    font-size: 0.76rem !important;
    color: var(--text4) !important;
    max-width: 760px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.5;
}

/* --------------------------------------------------------------------------
   17. Helper Classes & States
   -------------------------------------------------------------------------- */
.empty-state {
    text-align: center;
    padding: 56px 20px;
    color: var(--text3);
}
.empty-state .icon {
    font-size: 2.6rem;
    margin-bottom: 14px;
    opacity: 0.7;
}

.text-center { text-align: center; }
.mt-20 { margin-top: 20px; }
.mb-20 { margin-bottom: 20px; }
.hidden { display: none !important; }

/* --------------------------------------------------------------------------
   18. Responsive Breakpoints (Mobile-First Optimizations)
   -------------------------------------------------------------------------- */
@media (max-width: 960px) {
    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 32px;
    }
    .cards-grid {
        grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
        gap: 16px;
    }
    .pyq-cta-box {
        flex-direction: column;
        text-align: center;
        align-items: center;
        padding: 30px 24px;
    }
    .pyq-cta-features {
        justify-content: center;
    }
    .pyq-cta-action {
        width: 100%;
    }
    .pyq-btn {
        width: 100%;
        max-width: 320px;
    }
}

@media (max-width: 1100px) {
    .nav-toggle {
        display: flex;
    }

    /* Tablet + mobile navigation drawer — 6 links overflow before 768px */
    .nav-links {
        position: fixed;
        top: var(--header-height);
        left: 0;
        right: 0;
        max-height: calc(100vh - var(--header-height));
        overflow-y: auto;
        -webkit-overflow-scrolling: touch;
        background: var(--surface);
        border-bottom: 1px solid var(--border);
        flex-direction: column;
        padding: 14px 18px 24px;
        gap: 4px;
        display: none;
        box-shadow: var(--shadow-lg);
        z-index: 999;
    }

    .nav-links.open {
        display: flex;
    }

    .nav-link {
        width: 100%;
        padding: 12px 16px;
        font-size: 0.98rem;
        min-height: 44px;
    }
}

@media (max-width: 768px) {
    :root {
        --header-height: 60px;
    }

    .container {
        padding: 0 18px;
    }

    .nav-container {
        padding: 0 18px;
    }

    .nav-link {
        width: 100%;
        padding: 12px 16px;
        font-size: 0.98rem;
        min-height: 44px;
    }

    .hero-home {
        padding: 42px 0 40px;
    }
    .hero-home h1 {
        font-size: clamp(1.8rem, 7.5vw, 2.45rem);
        letter-spacing: -0.8px;
        line-height: 1.22;
    }
    .hero-lead {
        font-size: 0.98rem;
        margin-bottom: 24px;
    }
    .hero-actions {
        flex-direction: column;
        width: 100%;
        max-width: 320px;
        margin-left: auto;
        margin-right: auto;
    }
    .hero-actions .btn {
        width: 100%;
    }

    .hero-stats {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 16px 12px;
        max-width: 290px;
        margin-left: auto;
        margin-right: auto;
    }

    .section {
        padding: 42px 0;
    }
    .section-header h2 {
        font-size: 1.45rem;
    }
    .page-header {
        padding: 32px 0 20px;
    }

    .cards-grid,
    .exam-cards {
        grid-template-columns: 1fr !important;
        gap: 14px;
    }

    .features-grid,
    .roadmap-grid {
        grid-template-columns: 1fr !important;
    }

    .filter-tabs {
        justify-content: flex-start;
        overflow-x: auto;
        flex-wrap: nowrap;
        -webkit-overflow-scrolling: touch;
        padding-bottom: 4px;
        margin-left: -18px;
        margin-right: -18px;
        padding-left: 18px;
        padding-right: 18px;
        scrollbar-width: none;
    }
    .filter-tabs::-webkit-scrollbar {
        display: none;
    }
    .filter-tab {
        flex-shrink: 0;
    }

    .filter-bar {
        margin-left: -18px;
        margin-right: -18px;
        padding-left: 18px;
        padding-right: 18px;
        width: calc(100% + 36px);
    }

    .content-box {
        padding: 22px 18px;
        border-radius: var(--radius);
    }

    .footer-grid {
        grid-template-columns: 1fr !important;
        gap: 28px;
    }

    .conducting-grid {
        grid-template-columns: 1fr 1fr;
        gap: 20px;
    }

    .exam-header {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }
    .info-grid {
        grid-template-columns: 1fr 1fr;
    }

    /* iOS auto-zoom prevention */
    input, select, textarea {
        font-size: 16px !important;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 14px;
    }
    .nav-container {
        padding: 0 14px;
    }

    .hero-stats {
        max-width: 100%;
        gap: 14px 8px;
    }

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

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

    .btn-lg {
        padding: 13px 22px;
        font-size: 0.96rem;
    }

    .card {
        padding: 18px 16px;
    }

    .card-title {
        font-size: 1.02rem;
    }
}

/* --------------------------------------------------------------------------
   19. Touch Target Standards & Reduced Motion
   -------------------------------------------------------------------------- */
@media (hover: none) and (pointer: coarse) {
    .nav-link,
    .filter-tab,
    .filter-btn,
    .btn,
    .theme-toggle,
    .nav-toggle {
        min-height: 44px;
    }
}

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