/* ============================================
   CGPA Calculator Pakistan - Main Stylesheet
   Dark & Light Theme System
   ============================================ */

/* === DARK THEME (default) === */
:root, [data-theme="dark"] {
    --primary: #6C5CE7;
    --primary-dark: #5A4BD1;
    --primary-light: #A29BFE;
    --secondary: #00CEC9;
    --secondary-dark: #00B5B0;
    --accent: #FD79A8;
    --success: #00B894;
    --warning: #FDCB6E;
    --danger: #FF6B6B;
    --bg-body: #0F0F1A;
    --bg-surface: #16213E;
    --bg-surface-light: #1E2D50;
    --bg-glass: rgba(255,255,255,0.05);
    --bg-glass-hover: rgba(255,255,255,0.08);
    --border-glass: rgba(255,255,255,0.08);
    --border-glass-hover: rgba(255,255,255,0.15);
    --text: #E8E8F0;
    --text-muted: rgba(255,255,255,0.55);
    --text-dim: rgba(255,255,255,0.35);
    --text-heading: #ffffff;
    --header-bg: rgba(15,15,26,0.85);
    --footer-bg: #0a0a14;
    --footer-wave: #0f0f1a;
    --input-bg: rgba(255,255,255,0.06);
    --input-border: rgba(255,255,255,0.1);
    --input-text: #ffffff;
    --card-bg: rgba(255,255,255,0.04);
    --card-border: rgba(255,255,255,0.06);
    --code-bg: rgba(108,92,231,0.15);
    --shadow: 0 4px 24px rgba(0,0,0,0.3);
    --shadow-glow: 0 0 40px rgba(108,92,231,0.25);
    --bg-gradient-1: rgba(108,92,231,0.12);
    --bg-gradient-2: rgba(0,206,201,0.08);
    --grade-cell-bg: rgba(108,92,231,0.12);
}

/* === LIGHT THEME === */
[data-theme="light"] {
    --primary: #5A4BD1;
    --primary-dark: #4A3DB5;
    --primary-light: #6C5CE7;
    --secondary: #00A8A3;
    --secondary-dark: #008F8B;
    --bg-body: #F5F7FB;
    --bg-surface: #FFFFFF;
    --bg-surface-light: #F0F2F8;
    --bg-glass: rgba(0,0,0,0.03);
    --bg-glass-hover: rgba(0,0,0,0.06);
    --border-glass: rgba(0,0,0,0.08);
    --border-glass-hover: rgba(0,0,0,0.15);
    --text: #2D3748;
    --text-muted: rgba(0,0,0,0.55);
    --text-dim: rgba(0,0,0,0.35);
    --text-heading: #1A202C;
    --header-bg: rgba(255,255,255,0.9);
    --footer-bg: #1A202C;
    --footer-wave: #F5F7FB;
    --input-bg: #F7F8FC;
    --input-border: rgba(0,0,0,0.12);
    --input-text: #1A202C;
    --card-bg: #FFFFFF;
    --card-border: rgba(0,0,0,0.08);
    --code-bg: rgba(108,92,231,0.1);
    --shadow: 0 4px 24px rgba(0,0,0,0.08);
    --shadow-glow: 0 0 40px rgba(108,92,231,0.1);
    --bg-gradient-1: rgba(108,92,231,0.06);
    --bg-gradient-2: rgba(0,206,201,0.04);
    --grade-cell-bg: rgba(108,92,231,0.08);
    --success: #00A67E;
    --warning: #E5A800;
    --danger: #E53E3E;
}

/* === Shared Variables === */
:root {
    --radius-sm: 8px;
    --radius: 14px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    --font: 'Outfit', -apple-system, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --container: 1200px;
}

/* === Reset & Base === */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
    font-family: var(--font);
    background: var(--bg-body);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    transition: background 0.4s, color 0.4s;
}

body::before {
    content: '';
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background:
        radial-gradient(ellipse at 20% 0%, var(--bg-gradient-1) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 100%, var(--bg-gradient-2) 0%, transparent 50%);
    pointer-events: none;
    z-index: 0;
    transition: background 0.4s;
}

.container { max-width: var(--container); margin: 0 auto; padding: 0 24px; position: relative; }

a { color: var(--primary-light); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--secondary); }

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

h1, h2, h3, h4, h5, h6 { color: var(--text-heading); }

.section-title { font-size: 1.8rem; font-weight: 800; margin-bottom: 8px; }
.section-subtitle { color: var(--text-muted); font-size: 0.95rem; }

/* === Header === */
.site-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: var(--header-bg);
    backdrop-filter: blur(20px) saturate(1.8);
    border-bottom: 1px solid var(--border-glass);
    transition: var(--transition);
}

.main-nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 68px;
    gap: 16px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--text-heading) !important;
    font-weight: 700;
    font-size: 1.1rem;
    white-space: nowrap;
    flex-shrink: 0;
}

.logo-icon { display: flex; }

.nav-links {
    display: flex;
    align-items: center;
    gap: 4px;
    flex: 1;
    justify-content: center;
}

.nav-link {
    padding: 8px 16px;
    border-radius: 10px;
    color: var(--text-muted) !important;
    font-size: 0.9rem;
    font-weight: 500;
    transition: var(--transition);
    white-space: nowrap;
}

.nav-link:hover, .nav-link.active {
    color: var(--text-heading) !important;
    background: var(--bg-glass);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-shrink: 0;
}

/* Theme Toggle */
.theme-toggle {
    width: 42px;
    height: 42px;
    border-radius: 12px;
    border: 1px solid var(--border-glass);
    background: var(--bg-glass);
    color: var(--text-muted);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    position: relative;
    font-size: 1rem;
}

.theme-toggle:hover {
    background: var(--bg-glass-hover);
    border-color: var(--border-glass-hover);
    color: var(--primary);
}

[data-theme="dark"] .theme-icon-dark { display: none; }
[data-theme="dark"] .theme-icon-light { display: inline; }
[data-theme="light"] .theme-icon-light { display: none; }
[data-theme="light"] .theme-icon-dark { display: inline; }

/* Mobile Toggle */
.mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.mobile-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text);
    border-radius: 2px;
    transition: var(--transition);
}

/* Dropdown */
.nav-dropdown { position: relative; }
.dropdown-toggle { display: flex; align-items: center; gap: 6px; }
.dropdown-toggle i { font-size: 0.65rem; transition: var(--transition); }

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%) translateY(8px);
    background: var(--bg-surface);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius);
    padding: 12px;
    min-width: 500px;
    max-height: 400px;
    overflow-y: auto;
    box-shadow: var(--shadow);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 100;
}

.nav-dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}

.dropdown-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4px;
}

.dropdown-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 14px;
    border-radius: var(--radius-sm);
    color: var(--text) !important;
    transition: var(--transition);
}

.dropdown-item:hover {
    background: var(--bg-glass);
    color: var(--primary-light) !important;
}

.uni-badge {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: #fff;
    font-size: 0.65rem;
    font-weight: 700;
    padding: 3px 8px;
    border-radius: 6px;
    white-space: nowrap;
    min-width: 42px;
    text-align: center;
}

.uni-name { font-size: 0.85rem; font-weight: 500; }

/* === Breadcrumb === */
.breadcrumb {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 20px;
    font-size: 0.85rem;
    color: var(--text-muted);
    flex-wrap: wrap;
}
.breadcrumb a { color: var(--text-muted); }
.breadcrumb a:hover { color: var(--primary-light); }
.breadcrumb i { font-size: 0.6rem; }
.breadcrumb span { color: var(--primary-light); font-weight: 500; }

/* === Hero === */
.hero {
    text-align: center;
    padding: 80px 0 60px;
}

.hero h1 {
    font-size: clamp(2rem, 5vw, 3.2rem);
    font-weight: 900;
    line-height: 1.15;
    margin-bottom: 16px;
    letter-spacing: -0.02em;
}

.gradient {
    background: linear-gradient(135deg, var(--primary), var(--secondary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 20px;
    background: var(--bg-glass);
    border: 1px solid var(--border-glass);
    border-radius: 50px;
    font-size: 0.82rem;
    font-weight: 500;
    color: var(--text-muted);
    margin-bottom: 24px;
    animation: fadeInUp 0.6s ease both;
}

.hero-desc {
    color: var(--text-muted);
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto 32px;
    line-height: 1.7;
}

/* Calc Page Hero */
.calc-page-hero {
    padding: 40px 0 24px;
}
.calc-page-hero h1 {
    font-size: 1.8rem;
    font-weight: 800;
    margin-bottom: 8px;
}
.calc-page-hero h1 i {
    color: var(--primary);
    margin-right: 8px;
}

/* === University Hero === */
.uni-hero {
    padding: 32px 0 24px;
}
.uni-hero-content {
    display: flex;
    align-items: flex-start;
    gap: 24px;
}
.uni-hero-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 1rem;
    color: #fff;
    flex-shrink: 0;
    box-shadow: 0 8px 30px rgba(108,92,231,0.3);
}
.uni-hero-info h1 {
    font-size: 1.8rem;
    font-weight: 800;
    margin-bottom: 12px;
    line-height: 1.2;
}
.uni-meta-row {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 12px;
}
.uni-meta-tag {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 5px 14px;
    background: var(--bg-glass);
    border: 1px solid var(--border-glass);
    border-radius: 50px;
    font-size: 0.82rem;
    font-weight: 500;
    color: var(--text-muted);
}
.uni-meta-tag.link { color: var(--primary-light); }
.uni-meta-tag.link:hover { color: var(--secondary); background: var(--bg-glass-hover); }
.uni-hero-desc {
    color: var(--text-muted);
    font-size: 0.95rem;
    max-width: 600px;
    line-height: 1.7;
}

/* === Buttons === */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: 12px;
    font-family: var(--font);
    font-size: 0.92rem;
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    color: #fff;
    white-space: nowrap;
}

.btn:hover { transform: translateY(-2px); color: #fff; }

.btn-primary { background: linear-gradient(135deg, var(--primary), #a855f7); box-shadow: 0 4px 16px rgba(108,92,231,0.3); }
.btn-primary:hover { box-shadow: 0 8px 30px rgba(108,92,231,0.4); }

.btn-success { background: linear-gradient(135deg, var(--success), var(--secondary)); box-shadow: 0 4px 16px rgba(0,184,148,0.3); }

.btn-secondary {
    background: var(--bg-glass);
    border: 1px solid var(--border-glass);
    color: var(--text-muted);
}
.btn-secondary:hover { background: var(--bg-glass-hover); border-color: var(--border-glass-hover); color: var(--text); }

.btn-lg { padding: 14px 32px; font-size: 1rem; border-radius: 14px; }

/* === University Grid === */
.uni-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 16px;
}

.uni-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: var(--radius);
    padding: 20px;
    transition: var(--transition);
    color: var(--text) !important;
    text-decoration: none;
    display: flex;
    flex-direction: column;
}

.uni-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-glow);
    border-color: var(--primary);
    color: var(--text) !important;
}

.uni-card-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 10px;
}

.uni-card-icon {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 0.65rem;
    color: #fff;
    flex-shrink: 0;
}

.uni-card-info h3 {
    font-size: 0.95rem;
    font-weight: 700;
    line-height: 1.3;
    color: var(--text-heading);
}

.uni-card-info span {
    font-size: 0.78rem;
    color: var(--text-muted);
}

.uni-card-desc {
    font-size: 0.85rem;
    color: var(--text-muted);
    line-height: 1.5;
    flex: 1;
    margin-bottom: 12px;
}

.uni-card-footer {
    display: flex;
    gap: 8px;
}

.uni-card-btn {
    flex: 1;
    padding: 8px 12px;
    text-align: center;
    border-radius: var(--radius-sm);
    font-size: 0.78rem;
    font-weight: 600;
}

.uni-card-btn.gpa {
    background: rgba(108,92,231,0.12);
    color: var(--primary-light);
    border: 1px solid rgba(108,92,231,0.2);
}

.uni-card-btn.cgpa {
    background: rgba(0,206,201,0.12);
    color: var(--secondary);
    border: 1px solid rgba(0,206,201,0.2);
}

/* === Tabs === */
.uni-tabs {
    display: flex;
    gap: 4px;
    background: var(--bg-glass);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius);
    padding: 4px;
    margin-bottom: 24px;
}

.uni-tab {
    flex: 1;
    padding: 12px 20px;
    background: transparent;
    border: none;
    border-radius: 10px;
    font-family: var(--font);
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-muted);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.uni-tab:hover { color: var(--text); }
.uni-tab.active {
    background: linear-gradient(135deg, var(--primary), #a855f7);
    color: #fff;
    box-shadow: 0 4px 16px rgba(108,92,231,0.3);
}

/* === Calculator === */
.calc-page { padding: 0 0 40px; }

.calc-layout {
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: 24px;
    align-items: flex-start;
}

.calc-main { min-width: 0; }

.calculator-box {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-lg);
    padding: 32px;
}

.calc-title {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 6px;
}
.calc-title i { color: var(--primary); margin-right: 6px; }
.calc-subtitle { color: var(--text-muted); font-size: 0.9rem; }

/* Sidebar */
.calc-sidebar { position: sticky; top: 92px; }

.sidebar-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: var(--radius);
    padding: 20px;
    margin-bottom: 16px;
}

.sidebar-card h3 {
    font-size: 0.95rem;
    font-weight: 700;
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 8px;
}
.sidebar-card h3 i { color: var(--primary); }

.sidebar-uni-list { display: flex; flex-direction: column; gap: 4px; }
.sidebar-uni-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 12px;
    border-radius: var(--radius-sm);
    color: var(--text-muted) !important;
    font-size: 0.82rem;
    transition: var(--transition);
}
.sidebar-uni-item:hover, .sidebar-uni-item.active {
    background: var(--bg-glass);
    color: var(--text-heading) !important;
}
.sidebar-uni-item.active { border-left: 3px solid var(--primary); }
.sidebar-uni-badge {
    background: var(--bg-glass);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.7rem;
    font-weight: 700;
    color: var(--primary-light);
    min-width: 36px;
    text-align: center;
}

/* CGPA Guide */
.cgpa-guide { display: flex; flex-direction: column; gap: 8px; }
.guide-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 14px;
    border-radius: var(--radius-sm);
    font-size: 0.82rem;
}
.guide-item.excellent { background: rgba(0,184,148,0.12); color: var(--success); border-left: 3px solid var(--success); }
.guide-item.good { background: rgba(108,92,231,0.12); color: var(--primary-light); border-left: 3px solid var(--primary); }
.guide-item.average { background: rgba(253,203,110,0.12); color: var(--warning); border-left: 3px solid var(--warning); }
.guide-item.poor { background: rgba(255,107,107,0.12); color: var(--danger); border-left: 3px solid var(--danger); }
.guide-range { font-weight: 700; font-family: var(--font-mono); }
.guide-label { font-weight: 500; }

.sidebar-tips { list-style: none; padding: 0; }
.sidebar-tips li {
    padding: 8px 0;
    border-bottom: 1px solid var(--border-glass);
    font-size: 0.85rem;
    color: var(--text-muted);
    line-height: 1.5;
}
.sidebar-tips li:last-child { border-bottom: none; }

/* Subject rows */
.subject-labels {
    display: grid;
    grid-template-columns: 2fr 80px 1fr 40px;
    gap: 10px;
    padding: 0 0 10px;
    font-size: 0.78rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--text-muted);
}

.subject-row {
    display: grid;
    grid-template-columns: 2fr 80px 1fr 40px;
    gap: 10px;
    margin-bottom: 10px;
    animation: slideIn 0.3s ease;
}

.subject-row input,
.subject-row select,
.uni-selector,
.semester-card input {
    width: 100%;
    padding: 12px 14px;
    background: var(--input-bg);
    border: 1px solid var(--input-border);
    border-radius: 10px;
    color: var(--input-text);
    font-family: var(--font);
    font-size: 0.9rem;
    transition: var(--transition);
}

.subject-row input:focus,
.subject-row select:focus,
.uni-selector:focus,
.semester-card input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(108,92,231,0.15);
}

.subject-row select {
    appearance: auto;
    cursor: pointer;
}

.btn-remove-subject {
    width: 40px;
    height: 44px;
    border: 1px solid rgba(255,107,107,0.2);
    background: rgba(255,107,107,0.1);
    color: var(--danger);
    border-radius: 10px;
    cursor: pointer;
    font-size: 0.85rem;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-remove-subject:hover {
    background: rgba(255,107,107,0.2);
    border-color: rgba(255,107,107,0.4);
}

.form-label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-muted);
    margin-bottom: 6px;
}

.form-label i { margin-right: 4px; }

.uni-selector {
    display: block;
    appearance: auto;
    cursor: pointer;
}

/* Semester cards */
.semester-card {
    background: var(--bg-glass);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius);
    padding: 16px 20px;
    margin-bottom: 12px;
    animation: slideIn 0.3s ease;
}

.semester-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

.semester-badge {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: #fff;
    font-size: 0.75rem;
    font-weight: 700;
    padding: 4px 12px;
    border-radius: 8px;
}

.semester-fields {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.semester-field label {
    display: block;
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--text-muted);
    margin-bottom: 4px;
}

.calc-actions {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-top: 20px;
}

/* === Result Display === */
.result-display {
    margin-top: 24px;
    display: none;
}

.result-display.visible { display: block; animation: resultReveal 0.5s ease; }

.result-card {
    background: linear-gradient(135deg, rgba(108,92,231,0.15), rgba(0,206,201,0.1));
    border: 1px solid rgba(108,92,231,0.2);
    border-radius: var(--radius-lg);
    padding: 32px;
    text-align: center;
}

.result-gpa-ring {
    width: 160px;
    height: 160px;
    margin: 0 auto 20px;
    position: relative;
}

.result-gpa-ring svg {
    width: 100%;
    height: 100%;
    transform: rotate(-90deg);
}

.result-gpa-ring .ring-bg {
    fill: none;
    stroke: var(--border-glass);
    stroke-width: 8;
}

.result-gpa-ring .ring-fill {
    fill: none;
    stroke: url(#resultGrad);
    stroke-width: 8;
    stroke-linecap: round;
    transition: stroke-dashoffset 1.5s ease;
}

.result-gpa-value {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
}

.result-gpa-value .gpa-number {
    font-size: 2.5rem;
    font-weight: 900;
    font-family: var(--font-mono);
    color: var(--text-heading);
    line-height: 1;
}

.result-gpa-value .gpa-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-weight: 500;
}

.result-stats {
    display: flex;
    justify-content: center;
    gap: 32px;
    margin-top: 16px;
    flex-wrap: wrap;
}

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

.result-stat .stat-value {
    font-size: 1.2rem;
    font-weight: 700;
    font-family: var(--font-mono);
    color: var(--text-heading);
}

.result-stat .stat-label {
    font-size: 0.78rem;
    color: var(--text-muted);
}

.result-badge {
    display: inline-block;
    padding: 6px 20px;
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 700;
    margin-top: 12px;
}

.result-badge.excellent { background: rgba(0,184,148,0.2); color: var(--success); }
.result-badge.good { background: rgba(108,92,231,0.2); color: var(--primary-light); }
.result-badge.average { background: rgba(253,203,110,0.2); color: var(--warning); }
.result-badge.poor { background: rgba(255,107,107,0.2); color: var(--danger); }

/* === Grading Table === */
.grading-table-wrapper { overflow-x: auto; }

.grading-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}

.grading-table th {
    text-align: left;
    padding: 12px 16px;
    font-size: 0.78rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--text-muted);
    border-bottom: 2px solid var(--border-glass);
}

.grading-table td {
    padding: 10px 16px;
    border-bottom: 1px solid var(--border-glass);
    color: var(--text);
}

.grading-table tr:hover td { background: var(--bg-glass); }
.grading-table .grade-cell { font-weight: 700; color: var(--primary-light); background: var(--grade-cell-bg); text-align: center; }

/* Formula Box */
.formula-box {
    margin-top: 28px;
    padding: 24px;
    background: var(--bg-glass);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius);
}
.formula-box h3 {
    font-size: 1.05rem;
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 8px;
}
.formula-box h3 i { color: var(--warning); }
.formula-steps { display: flex; flex-direction: column; gap: 10px; margin-bottom: 16px; }
.formula-step {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 0.9rem;
    color: var(--text-muted);
    line-height: 1.6;
}
.step-num {
    width: 28px;
    height: 28px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: 700;
    flex-shrink: 0;
}
.formula-display {
    text-align: center;
    padding: 16px;
    background: var(--code-bg);
    border-radius: var(--radius-sm);
}
.formula-display code {
    font-family: var(--font-mono);
    font-size: 0.95rem;
    color: var(--secondary);
    font-weight: 600;
}

/* === Content Sections === */
.content-sections { padding: 20px 0 40px; }

.content-section {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: var(--radius);
    padding: 32px;
    margin-bottom: 20px;
}

.content-section h2 {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--border-glass);
}

.section-body, .content-section div {
    color: var(--text-muted);
    line-height: 1.8;
    font-size: 0.95rem;
}

.section-body p, .content-section p { margin-bottom: 12px; }
.section-body h3, .content-section h3 { font-size: 1.1rem; font-weight: 700; margin: 20px 0 10px; color: var(--text-heading); }
.section-body ul, .content-section ul { padding-left: 24px; margin-bottom: 12px; }
.section-body li, .content-section li { margin-bottom: 6px; }
.section-body strong, .content-section strong { color: var(--text-heading); }
.section-body code, .content-section code { background: var(--code-bg); padding: 2px 8px; border-radius: 4px; font-family: var(--font-mono); font-size: 0.88rem; color: var(--secondary); }

.faq-item { margin-bottom: 20px; padding-bottom: 20px; border-bottom: 1px solid var(--border-glass); }
.faq-item:last-child { border-bottom: none; margin-bottom: 0; padding-bottom: 0; }
.faq-item h3 { color: var(--text-heading); margin-bottom: 8px !important; margin-top: 0 !important; }

/* === Blog === */
.blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
}

.blog-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: var(--radius);
    overflow: hidden;
    transition: var(--transition);
}

.blog-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow);
}

.blog-card-image {
    height: 180px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.blog-card-image img { width: 100%; height: 100%; object-fit: cover; }
.blog-card-image i { font-size: 2.5rem; color: rgba(255,255,255,0.5); }
.blog-card-body { padding: 20px; }

.blog-card-meta {
    display: flex;
    gap: 16px;
    margin-bottom: 8px;
    font-size: 0.78rem;
    color: var(--text-dim);
}

.blog-card-body h3 { font-size: 1.05rem; font-weight: 700; margin-bottom: 8px; line-height: 1.4; }
.blog-card-body h3 a { color: var(--text-heading); }
.blog-card-body h3 a:hover { color: var(--primary-light); }
.blog-card-excerpt { font-size: 0.88rem; color: var(--text-muted); line-height: 1.6; }

/* Blog Single */
.blog-single { padding: 40px 0 60px; }
.blog-featured-img { width: 100%; border-radius: var(--radius-lg); margin-bottom: 24px; }
.blog-single h1 { font-size: 2rem; font-weight: 800; margin-bottom: 16px; }
.blog-single-meta { display: flex; gap: 20px; margin-bottom: 32px; font-size: 0.85rem; color: var(--text-muted); flex-wrap: wrap; }
.blog-content { color: var(--text); line-height: 1.9; font-size: 1rem; }
.blog-content p { margin-bottom: 16px; }
.blog-content h2 { font-size: 1.4rem; margin: 28px 0 12px; }
.blog-content h3 { font-size: 1.2rem; margin: 20px 0 10px; }

/* === Footer === */
.site-footer {
    background: var(--footer-bg);
    color: rgba(255,255,255,0.7);
    padding: 60px 0 24px;
    position: relative;
}

.footer-wave {
    position: absolute;
    top: -1px;
    left: 0;
    right: 0;
    color: var(--bg-body);
    line-height: 0;
}

.footer-wave svg { width: 100%; height: 60px; }

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-logo {
    font-size: 1.2rem;
    font-weight: 700;
    color: #fff !important;
    display: block;
    margin-bottom: 12px;
}

.footer-desc { font-size: 0.88rem; line-height: 1.6; opacity: 0.6; margin-bottom: 16px; }

.social-links { display: flex; gap: 8px; }

.social-link {
    width: 36px;
    height: 36px;
    background: rgba(255,255,255,0.1);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: rgba(255,255,255,0.6) !important;
    font-size: 0.85rem;
    transition: var(--transition);
}

.social-link:hover { background: var(--primary); color: #fff !important; transform: translateY(-2px); }

.footer-col h4 { font-size: 0.88rem; font-weight: 700; color: #fff; margin-bottom: 16px; text-transform: uppercase; letter-spacing: 0.04em; }
.footer-col ul { list-style: none; }
.footer-col li { margin-bottom: 8px; }
.footer-col a { color: rgba(255,255,255,0.5) !important; font-size: 0.88rem; }
.footer-col a:hover { color: #fff !important; }

.footer-bottom { padding-top: 24px; border-top: 1px solid rgba(255,255,255,0.08); text-align: center; font-size: 0.82rem; color: rgba(255,255,255,0.35); }
.footer-note { margin-top: 6px; font-size: 0.78rem; }

/* === Ad Slots === */
.ad-slot { padding: 8px 0; text-align: center; }

/* === Animations === */
@keyframes fadeInUp { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }
@keyframes slideIn { from { opacity: 0; transform: translateX(-10px); } to { opacity: 1; transform: translateX(0); } }
@keyframes resultReveal { from { opacity: 0; transform: scale(0.95); } to { opacity: 1; transform: scale(1); } }

.animate-in { opacity: 0; transform: translateY(20px); transition: opacity 0.5s, transform 0.5s; }
.animate-in.visible { opacity: 1; transform: translateY(0); }

/* Confetti */
.confetti-piece {
    position: fixed;
    width: 8px;
    height: 8px;
    border-radius: 2px;
    pointer-events: none;
    z-index: 9999;
    animation: confettiFall 2s ease forwards;
}

@keyframes confettiFall {
    0% { opacity: 1; transform: translateY(0) rotate(0deg); }
    100% { opacity: 0; transform: translateY(100vh) rotate(720deg); }
}

/* === Responsive === */
@media (max-width: 768px) {
    .nav-links { display: none; flex-direction: column; position: absolute; top: 68px; left: 0; right: 0; background: var(--bg-surface); border-bottom: 1px solid var(--border-glass); padding: 12px; gap: 4px; }
    .nav-links.open { display: flex; }
    .mobile-toggle { display: flex; }
    .dropdown-menu { position: static; transform: none; min-width: 100%; box-shadow: none; opacity: 1; visibility: visible; background: var(--bg-glass); max-height: 200px; }
    .dropdown-grid { grid-template-columns: 1fr; }
    .nav-dropdown:hover .dropdown-menu { transform: none; }
    
    .hero h1 { font-size: 1.8rem; }
    .hero { padding: 48px 0 40px; }
    
    .uni-hero-content { flex-direction: column; align-items: center; text-align: center; }
    .uni-hero-info h1 { font-size: 1.4rem; }
    .uni-meta-row { justify-content: center; }
    
    .uni-tabs { flex-direction: column; }
    .uni-grid { grid-template-columns: 1fr; }
    .calc-layout { grid-template-columns: 1fr; }
    .calc-sidebar { position: static; }
    
    .subject-labels, .subject-row { grid-template-columns: 2fr 60px 1fr 36px; gap: 6px; }
    .calculator-box { padding: 20px; }
    
    .footer-grid { grid-template-columns: 1fr; gap: 24px; }
    .blog-grid { grid-template-columns: 1fr; }
    
    .result-stats { gap: 16px; }
}

@media (max-width: 480px) {
    .container { padding: 0 16px; }
    .subject-labels { display: none; }
    .subject-row { grid-template-columns: 1fr 1fr; gap: 8px; }
    .subject-row input:first-child { grid-column: 1 / -1; }
}