/* NPTEL Candidate Portal - Main Stylesheet */

:root {
    --nptel-primary: #800020;
    --nptel-primary-light: #5a0018;
    --nptel-primary-lighter: #9a0026;
    --nptel-accent: #FFD700;
    --nptel-secondary: #6c757d;
    --nptel-success: #198754;
    --nptel-info: #0dcaf0;
    --nptel-warning: #ffc107;
    --nptel-danger: #dc3545;
    --nptel-text-dark: #1c1c28;
    --nptel-text-muted: #555770;
    --nptel-bg-light: #FFF8E7;
}

/* study.iitm.ac.in scheme — Bootstrap primary override (#133) */
:root {
    --bs-primary: #800020;
    --bs-primary-rgb: 128, 0, 32;
}
.btn-primary {
    background-color: #800020;
    border-color: #800020;
}
.btn-primary:hover,
.btn-primary:focus,
.btn-primary:active {
    background-color: #5a0018;
    border-color: #5a0018;
}
.text-primary { color: #800020 !important; }
.bg-primary { background-color: #800020 !important; }
.border-primary { border-color: #800020 !important; }
.link-primary { color: #800020 !important; }

/* General Styles */
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

main {
    flex: 1;
}

/* Navbar Customization */
.nptel-navbar-public {
    background: linear-gradient(180deg, #5a0018 0%, #800020 100%);
    border-bottom: none;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.3);
    padding: 0;
    z-index: 1030;
    position: relative;
}

.nptel-navbar-public .navbar-brand {
    font-size: 1.35rem;
    letter-spacing: 0.5px;
    padding: 0.6rem 0;
}

.nptel-navbar-public .navbar-brand img {
    border: 2px solid rgba(255, 255, 255, 0.2);
    border-radius: 6px;
}

.nptel-navbar-public .navbar-nav .nav-link {
    color: rgba(255, 255, 255, 0.85);
    font-weight: 500;
    font-size: 0.9rem;
    padding: 0.75rem 0.85rem;
    transition: color 0.2s ease, background-color 0.2s ease;
    border-radius: 4px;
}

.nptel-navbar-public .navbar-nav .nav-link:hover,
.nptel-navbar-public .navbar-nav .nav-link:focus {
    color: #ffffff;
    background-color: rgba(255, 255, 255, 0.1);
}

.nptel-navbar-public .navbar-nav .nav-link.active {
    color: #ffffff;
}

.nptel-navbar-public .dropdown-menu {
    background: #ffffff;
    border: none;
    border-radius: 8px;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.15);
    padding: 0.5rem 0;
    margin-top: 0.25rem;
}

.nptel-navbar-public .dropdown-item {
    font-size: 0.9rem;
    padding: 0.5rem 1.25rem;
    color: #333;
    transition: all 0.15s ease;
}

.nptel-navbar-public .dropdown-item:hover {
    background-color: #e8eaf6;
    color: var(--nptel-primary);
}

.nptel-navbar-public .btn-outline-light {
    border-color: rgba(255, 255, 255, 0.5);
    font-weight: 600;
    border-radius: 6px;
    transition: all 0.2s ease;
}

.nptel-navbar-public .btn-outline-light:hover {
    background-color: rgba(255, 255, 255, 0.15);
    border-color: #fff;
}

.nptel-navbar {
    border-bottom: 1px solid #e5e7eb;
    padding: 0.75rem 1.25rem;
}

.nptel-brand {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
}

.nptel-brand:hover {
    opacity: 0.9;
}

.nptel-logo {
    height: 40px;
    width: auto;
}

.navbar-light .navbar-nav .nav-link {
    color: #111827;
    font-weight: 500;
    padding: 0.5rem 1rem;
}

.navbar-light .navbar-nav .nav-link:hover,
.navbar-light .navbar-nav .nav-link:focus {
    color: #800020;
}

.nptel-login {
    border-radius: 8px;
    padding: 0.4rem 1.25rem;
    font-weight: 600;
}

/* Hero Section */
.nptel-hero {
    background: linear-gradient(135deg, #5a0018 0%, #800020 40%, #5a0018 70%, #9a0026 100%);
    color: #ffffff;
    padding: 4.5rem 0 4rem;
    position: relative;
    overflow: hidden;
}

.nptel-hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(ellipse at 20% 50%, rgba(154, 0, 38, 0.3) 0%, transparent 60%),
        radial-gradient(ellipse at 80% 20%, rgba(90, 0, 24, 0.25) 0%, transparent 50%);
    pointer-events: none;
}

.nptel-hero::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image:
        linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
    background-size: 40px 40px;
    pointer-events: none;
}

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

.nptel-hero h1 {
    font-size: 2.75rem;
    font-weight: 800;
    letter-spacing: -0.5px;
    line-height: 1.2;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.nptel-hero .lead {
    font-size: 1.15rem;
    opacity: 0.9;
    line-height: 1.7;
    max-width: 600px;
}

.nptel-hero .btn-light {
    background: #ffffff;
    color: var(--nptel-primary);
    font-weight: 700;
    border: none;
    padding: 0.65rem 1.75rem;
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
    transition: all 0.25s ease;
}

.nptel-hero .btn-light:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
    background: #f5f5f5;
}

.nptel-hero .btn-outline-light {
    border: 2px solid rgba(255, 255, 255, 0.6);
    color: #ffffff;
    font-weight: 600;
    padding: 0.6rem 1.75rem;
    border-radius: 8px;
    transition: all 0.25s ease;
}

.nptel-hero .btn-outline-light:hover {
    background: rgba(255, 255, 255, 0.15);
    border-color: #ffffff;
    transform: translateY(-2px);
}

/* Stats Section */
.nptel-stats {
    background: var(--nptel-bg-light);
    padding: 3.5rem 0;
}

.nptel-stats .stat-card {
    text-align: center;
    padding: 1.75rem 1rem;
    border-radius: 12px;
    background: #ffffff;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
    border: 1px solid rgba(0, 0, 0, 0.04);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    height: 100%;
}

.nptel-stats .stat-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(128, 0, 32, 0.12);
}

.nptel-stats .stat-value {
    font-size: 2.25rem;
    font-weight: 800;
    color: var(--nptel-primary);
    line-height: 1.2;
}

.nptel-stats .stat-desc {
    color: var(--nptel-text-muted);
    font-size: 0.9rem;
    font-weight: 500;
    margin-top: 0.4rem;
}

/* Section Titles */
.section-title {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--nptel-text-dark);
    letter-spacing: -0.3px;
}

.section-subtitle {
    color: var(--nptel-text-muted);
    font-size: 1.05rem;
}

/* Footer Styles */
.nptel-footer {
    background-color: #fafafc !important;
    border-top: 1px solid #e5e7eb;
}

.nptel-footer h6 {
    color: #1c1c28;
    font-size: 16px;
    font-weight: 500;
    margin-bottom: 1rem;
}

.footer-links {
    line-height: 2.2;
}

.footer-links li {
    margin-bottom: 0.25rem;
}

.footer-links a {
    color: #8f90a6;
    text-decoration: none;
    font-size: 14px;
    transition: color 0.2s;
}

.footer-links a:hover {
    color: #800020;
}

.social-links a {
    color: #555770;
    font-size: 1.5rem;
    transition: color 0.2s;
}

.social-links a:hover {
    color: #800020;
}

.partner-logos img {
    opacity: 0.8;
    transition: opacity 0.2s;
    max-height: 40px;
    width: auto;
}

.partner-logos img:hover {
    opacity: 1;
}

/* Card Styles */
.card {
    border: none;
    border-radius: 8px;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
    transform: translateY(-2px);
}

.card-header {
    background-color: var(--nptel-primary);
    color: white;
    font-weight: 600;
    border-radius: 8px 8px 0 0 !important;
}

/* Dashboard Stats Cards */
.card.bg-primary,
.card.bg-success,
.card.bg-info,
.card.bg-warning {
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

/* Messages */
.messages-container {
    position: relative;
    z-index: 1000;
}

.alert {
    border-radius: 8px;
    border-left: 4px solid;
}

.alert-success {
    border-left-color: var(--nptel-success);
}

.alert-error,
.alert-danger {
    border-left-color: var(--nptel-danger);
}

.alert-warning {
    border-left-color: var(--nptel-warning);
}

.alert-info {
    border-left-color: var(--nptel-info);
}

/* Footer */
footer {
    margin-top: auto;
    border-top: 1px solid #dee2e6;
}

footer a {
    text-decoration: none;
    transition: color 0.2s ease;
}

footer a:hover {
    color: var(--nptel-primary) !important;
}

/* Buttons */
.btn {
    border-radius: 6px;
    font-weight: 500;
    transition: all 0.2s ease;
}

.btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.15);
}

/* Forms */
.form-control,
.form-select {
    border-radius: 6px;
    border: 1px solid #ced4da;
    transition: border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
}

.form-control:focus,
.form-select:focus {
    border-color: var(--nptel-primary);
    box-shadow: 0 0 0 0.25rem rgba(13, 110, 253, 0.25);
}

/* Tables */
.table {
    border-radius: 8px;
    overflow: hidden;
}

.table thead {
    background-color: var(--nptel-primary);
    color: white;
}

/* List Groups */
.list-group-item {
    border: none;
    border-bottom: 1px solid #dee2e6;
    transition: background-color 0.2s ease;
}

.list-group-item:hover {
    background-color: #f8f9fa;
}

.list-group-item:last-child {
    border-bottom: none;
}

/* Badges */
.badge {
    font-weight: 500;
    padding: 0.5em 0.8em;
    border-radius: 6px;
}

/* Loading Spinner (for HTMX) */
.htmx-indicator {
    display: none;
}

.htmx-request .htmx-indicator {
    display: inline-block;
}

.htmx-request.htmx-indicator {
    display: inline-block;
}

/* Utility Classes */
.shadow-sm-hover:hover {
    box-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075) !important;
}

.text-decoration-none:hover {
    text-decoration: underline !important;
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .navbar-brand {
        font-size: 1.25rem;
    }

    .card {
        margin-bottom: 1rem;
    }

    .display-4 {
        font-size: 2.5rem;
    }
}

/* Print styles */
@media print {
    .navbar,
    footer,
    .btn,
    .no-print {
        display: none !important;
    }
}

/* Certificate tier badges — Track C1 (#99).
   Elite+Gold uses a metallic-gold gradient; Elite+Silver uses metallic-silver.
   Plain Elite stays bg-warning yellow so the modifier tiers stand out. */
.cert-tier-gold {
    background: linear-gradient(135deg, #ffe066 0%, #d4a72c 50%, #c08a18 100%);
    color: #3b2c00;
    font-weight: 600;
    text-shadow: 0 1px 0 rgba(255, 255, 255, 0.4);
}
.cert-tier-silver {
    background: linear-gradient(135deg, #f1f3f5 0%, #adb5bd 50%, #6c757d 100%);
    color: #1f2429;
    font-weight: 600;
    text-shadow: 0 1px 0 rgba(255, 255, 255, 0.4);
}