/* Google Font Import */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

/* Dynamic Theme Variables */
:root {
    --primary-color: #3a86c8;
    --primary-pastel: #e0f2fe;
    --primary-hover: #0284c7;
    --bg-light: #f8fafc;
    --bg-white: #ffffff;
    --text-dark: #0f172a;
    --text-muted: #64748b;
    --text-light: #ffffff;
    --border-color: #e2e8f0;
    
    --success: #10b981;
    --success-bg: #ecfdf5;
    --warning: #f59e0b;
    --warning-bg: #fffbeb;
    --danger: #ef4444;
    --danger-bg: #fef2f2;
    
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 16px;
    
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

/* Global Reset & Base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-light);
    color: var(--text-dark);
    line-height: 1.6;
    overflow-x: hidden;
}

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

ul {
    list-style: none;
}

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

/* Header & Navigation */
.header {
    background-color: var(--bg-white);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-sm);
}

.nav-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
    height: 72px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 20px;
    font-weight: 700;
    color: var(--primary-color);
}

.logo-icon {
    width: 40px;
    height: 40px;
    background-color: var(--primary-pastel);
    color: var(--primary-color);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-link {
    font-size: 15px;
    font-weight: 500;
    color: var(--text-muted);
    padding: 8px 12px;
    border-radius: var(--radius-sm);
}

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

.nav-btn {
    background-color: var(--primary-color);
    color: var(--text-light);
    padding: 10px 20px;
    border-radius: var(--radius-md);
    font-weight: 600;
    border: none;
    cursor: pointer;
    box-shadow: var(--shadow-sm);
}

.nav-btn:hover {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

/* Responsive Hamburger */
.hamburger {
    display: none;
    flex-direction: column;
    gap: 6px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.hamburger span {
    display: block;
    width: 24px;
    height: 2.5px;
    background-color: var(--text-dark);
    border-radius: 2px;
    transition: var(--transition);
}

/* Home / Landing Page */
.hero-section {
    background: linear-gradient(135deg, var(--primary-pastel) 0%, var(--bg-white) 100%);
    padding: 80px 24px;
    text-align: center;
    border-bottom: 1px solid var(--border-color);
    position: relative;
    overflow: hidden;
}

.hero-container {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
    z-index: 10;
}

.hero-tag {
    display: inline-block;
    background-color: var(--bg-white);
    color: var(--primary-color);
    padding: 6px 16px;
    border-radius: 100px;
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 24px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
}

.hero-title {
    font-size: 44px;
    font-weight: 800;
    color: var(--text-dark);
    line-height: 1.2;
    margin-bottom: 20px;
    letter-spacing: -0.5px;
}

.hero-desc {
    font-size: 18px;
    color: var(--text-muted);
    margin-bottom: 32px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.news-section {
    max-width: 1280px;
    margin: 60px auto;
    padding: 0 24px;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    margin-bottom: 32px;
    border-left: 4px solid var(--primary-color);
    padding-left: 16px;
}

.section-title {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-dark);
}

.section-subtitle {
    font-size: 14px;
    color: var(--text-muted);
}

.grid-3 {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
    gap: 32px;
}

.card {
    background-color: var(--bg-white);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

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

.card-img {
    height: 200px;
    background-color: var(--primary-pastel);
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}

.card-tag {
    position: absolute;
    top: 16px;
    left: 16px;
    background-color: var(--bg-white);
    color: var(--primary-color);
    padding: 4px 12px;
    border-radius: 100px;
    font-size: 12px;
    font-weight: 600;
    box-shadow: var(--shadow-sm);
}

.card-body {
    padding: 24px;
}

.card-date {
    font-size: 13px;
    color: var(--text-muted);
    margin-bottom: 8px;
    display: block;
}

.card-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 12px;
    line-height: 1.4;
}

.card-text {
    font-size: 14px;
    color: var(--text-muted);
    margin-bottom: 20px;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.btn-link {
    font-weight: 600;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: 8px;
}

.btn-link:hover {
    color: var(--primary-hover);
}

/* Dashboard Layout */
.dashboard-wrapper {
    display: flex;
    min-height: calc(100vh - 72px);
}

.sidebar {
    width: 260px;
    background-color: var(--bg-white);
    border-right: 1px solid var(--border-color);
    padding: 32px 16px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    flex-shrink: 0;
}

.sidebar-heading {
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    color: var(--text-muted);
    padding-left: 16px;
    margin-top: 16px;
    margin-bottom: 8px;
    letter-spacing: 0.5px;
}

.sidebar-link {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    color: var(--text-muted);
    font-weight: 500;
    font-size: 14px;
    border-radius: var(--radius-md);
}

.sidebar-link:hover, .sidebar-link.active {
    color: var(--primary-color);
    background-color: var(--primary-pastel);
}

.sidebar-icon {
    font-size: 18px;
    width: 24px;
    text-align: center;
}

.main-content {
    flex-grow: 1;
    padding: 40px;
    max-width: 1400px;
    width: 100%;
}

.dashboard-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 40px;
}

.user-welcome h1 {
    font-size: 28px;
    font-weight: 700;
}

.user-welcome p {
    color: var(--text-muted);
}

/* Stats Cards */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 24px;
    margin-bottom: 40px;
}

.stat-card {
    background-color: var(--bg-white);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 24px;
    display: flex;
    align-items: center;
    gap: 20px;
    box-shadow: var(--shadow-sm);
}

.stat-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-md);
    background-color: var(--primary-pastel);
    color: var(--primary-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
}

.stat-info .stat-label {
    font-size: 13px;
    color: var(--text-muted);
    font-weight: 500;
}

.stat-info .stat-val {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-dark);
    line-height: 1.1;
    margin-top: 4px;
}

/* Tables Styling */
.table-container {
    background-color: var(--bg-white);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    overflow-x: auto;
    margin-bottom: 24px;
}

table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
    font-size: 14px;
}

th, td {
    padding: 16px 24px;
    border-bottom: 1px solid var(--border-color);
}

th {
    background-color: #f8fafc;
    font-weight: 600;
    color: var(--text-muted);
}

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

tr:hover td {
    background-color: #f8fafc;
}

.badge {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 100px;
    font-size: 12px;
    font-weight: 600;
}

.badge-primary { background-color: var(--primary-pastel); color: var(--primary-color); }
.badge-success { background-color: var(--success-bg); color: var(--success); }
.badge-warning { background-color: var(--warning-bg); color: var(--warning); }
.badge-danger { background-color: var(--danger-bg); color: var(--danger); }

/* Forms */
.form-card {
    background-color: var(--bg-white);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 32px;
    box-shadow: var(--shadow-sm);
    max-width: 800px;
    margin: 0 auto;
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-group.full-width {
    grid-column: span 2;
}

label {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-dark);
}

.required::after {
    content: " *";
    color: var(--danger);
}

input, select, textarea {
    font-family: var(--font-sans);
    padding: 12px 16px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 14px;
    outline: none;
    transition: var(--transition);
}

input:focus, select:focus, textarea:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px var(--primary-pastel);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-family: var(--font-sans);
    font-size: 14px;
    font-weight: 600;
    padding: 12px 24px;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: var(--transition);
}

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

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

.btn-secondary {
    background-color: #f1f5f9;
    color: var(--text-dark);
}

.btn-secondary:hover {
    background-color: #e2e8f0;
}

.btn-danger {
    background-color: var(--danger);
    color: var(--text-light);
}

.btn-danger:hover {
    background-color: #dc2626;
}

.btn-group {
    display: flex;
    gap: 12px;
    margin-top: 24px;
}

/* Flash Messages */
.alert {
    padding: 16px 24px;
    border-radius: var(--radius-md);
    margin-bottom: 24px;
    font-size: 14px;
    font-weight: 500;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.alert-success {
    background-color: var(--success-bg);
    color: var(--success);
    border: 1px solid #a7f3d0;
}

.alert-error {
    background-color: var(--danger-bg);
    color: var(--danger);
    border: 1px solid #fecaca;
}

/* Responsive Styles */
@media (max-width: 1024px) {
    .dashboard-wrapper {
        flex-direction: column;
    }
    
    .sidebar {
        width: 100%;
        border-right: none;
        border-bottom: 1px solid var(--border-color);
        padding: 16px 24px;
        flex-direction: row;
        flex-wrap: wrap;
    }
    
    .sidebar-heading {
        display: none;
    }
    
    .main-content {
        padding: 24px;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background-color: var(--bg-white);
        flex-direction: column;
        padding: 24px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
        gap: 16px;
        align-items: stretch;
    }
    
    .nav-menu.active {
        display: flex;
    }
    
    .nav-menu form {
        margin: 10px 0 !important;
        width: 100%;
        justify-content: space-between;
    }
    
    .nav-menu form select {
        flex-grow: 1;
    }
    
    .hamburger {
        display: flex;
    }
    
    .hero-title {
        font-size: 32px;
    }
    
    .grid-3 {
        grid-template-columns: 1fr;
    }
    
    .form-grid {
        grid-template-columns: 1fr;
    }
    
    .form-group.full-width {
        grid-column: span 1;
    }
}

/* Login Wrapper */
.login-wrapper {
    min-height: calc(100vh - 72px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    background: linear-gradient(135deg, var(--primary-pastel) 0%, var(--bg-light) 100%);
}

.login-card {
    background-color: var(--bg-white);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 40px;
    max-width: 440px;
    width: 100%;
    box-shadow: var(--shadow-lg);
}

.login-logo {
    text-align: center;
    margin-bottom: 32px;
}

.login-logo h2 {
    font-size: 24px;
    color: var(--primary-color);
    margin-top: 12px;
}

/* Iframe Assignment Display */
.iframe-container {
    position: relative;
    overflow: hidden;
    width: 100%;
    padding-top: 56.25%; /* 16:9 Aspect Ratio */
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    margin-bottom: 24px;
    box-shadow: var(--shadow-sm);
}

.iframe-container iframe {
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
    width: 100%;
    height: 100%;
    border: none;
}

/* Sidebar Accordion Groups */
.sidebar-group {
    display: flex;
    flex-direction: column;
}

.sidebar-group-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 16px;
    border-radius: var(--radius-md);
    background: none;
    border: none;
    cursor: pointer;
    font-family: var(--font-sans);
    font-size: 14px;
    font-weight: 600;
    color: var(--text-muted);
    width: 100%;
    text-align: left;
    transition: var(--transition);
}

.sidebar-group-header:hover {
    background-color: var(--primary-pastel);
    color: var(--primary-color);
}

.group-chevron {
    font-size: 12px;
    transition: transform 0.2s ease;
    flex-shrink: 0;
}

.sidebar-group-body {
    display: none;
    flex-direction: column;
    gap: 2px;
    padding-left: 8px;
    overflow: hidden;
}

.sidebar-group.open .sidebar-group-body {
    display: flex;
}

.sidebar-group.open .group-chevron {
    transform: rotate(180deg);
}

.sidebar-group.open .sidebar-group-header {
    color: var(--primary-color);
}

.sidebar-sub {
    font-size: 13px !important;
    padding: 9px 16px !important;
}

/* Student transcript table responsive */
.transcript-table th, .transcript-table td {
    padding: 10px 12px;
    font-size: 13px;
}