/* ==========================================================================
   1. GLOBAL SYSTEM SETTINGS & VARIABLES
   ========================================================================== */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --secondary: #0f172a;
    --text-dark: #1e293b;
    --text-light: #64748b;
    --bg-light: #f8fafc;
    --bg-white: #ffffff;
    --border: #e2e8f0;
    --success: #10b981;
    --radius-lg: 12px;
    --radius-md: 8px;
    --shadow: 0 10px 25px rgba(15, 23, 42, 0.05);
    --transition: all 0.25s ease-in-out;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-light);
    color: var(--text-dark);
    line-height: 1.6;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ==========================================================================
   2. SITE-WIDE RESPONSIVE NAVBAR & FOOTER
   ========================================================================== */
header {
    background-color: var(--bg-white);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.logo {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--secondary);
}

.logo span {
    color: var(--primary);
}

.nav-links {
    display: flex;
    align-items: center;
    list-style: none;
    gap: 30px;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-light);
    font-weight: 500;
    font-size: 0.95rem;
    transition: var(--transition);
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--primary);
}

.nav-links .login-btn {
    background-color: var(--primary);
    color: var(--bg-white);
    padding: 8px 20px;
    border-radius: var(--radius-md);
}

.nav-links .login-btn:hover,
.nav-links .login-btn.active {
    background-color: var(--primary-dark);
    color: var(--bg-white);
}

footer {
    background-color: var(--secondary);
    color: #94a3b8;
    text-align: center;
    padding: 25px 20px;
    font-size: 0.9rem;
    border-top: 1px solid rgba(255,255,255,0.05);
}

/* ==========================================================================
   3. INDEX / HOME PAGE LAYOUT HOOKS (ENHANCED PREMIUM UTILITY)
   ========================================================================== */
.hero-premium {
    position: relative;
    background: linear-gradient(135deg, #0f172a 0%, #1e1b4b 100%);
    color: #ffffff;
    padding: 100px 0;
    text-align: center;
    overflow: hidden;
}

.hero-premium::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background: radial-gradient(circle at 80% 20%, rgba(37, 99, 235, 0.15) 0%, transparent 50%);
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 800px;
    margin: 0 auto;
}

.hero-badge {
    display: inline-block;
    background: rgba(59, 130, 246, 0.15);
    color: #60a5fa;
    border: 1px solid rgba(59, 130, 246, 0.3);
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 25px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.hero-premium h1 {
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 20px;
    letter-spacing: -0.5px;
}

.hero-premium p {
    font-size: 1.25rem;
    color: #94a3b8;
    margin-bottom: 35px;
    line-height: 1.7;
}

.btn-hero {
    display: inline-block;
    padding: 14px 32px;
    font-weight: 600;
    border-radius: 8px;
    text-decoration: none;
    transition: all 0.2s ease-in-out;
    font-size: 1rem;
}

.btn-hero-primary {
    background-color: #2563eb;
    color: #ffffff;
    box-shadow: 0 4px 14px rgba(37, 99, 235, 0.3);
}

.btn-hero-primary:hover {
    background-color: #1d4ed8;
    transform: translateY(-2px);
}

.btn-hero-secondary {
    background-color: rgba(255, 255, 255, 0.05);
    color: #ffffff;
    border: 1px solid rgba(255, 255, 255, 0.15);
    margin-left: 15px;
}

.btn-hero-secondary:hover {
    background-color: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.25);
    transform: translateY(-2px);
}

/* Grade Selector Sections */
.hub-header {
    text-align: center;
    margin-bottom: 50px;
}

.hub-header h2 {
    font-size: 2.2rem;
    color: #0f172a;
    margin-bottom: 10px;
}

.hub-header p {
    color: #64748b;
    font-size: 1.1rem;
}

.grade-selection-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(450px, 1fr));
    gap: 30px;
    margin-bottom: 40px;
}

.grade-card {
    background: #ffffff;
    border: 1px solid #e2e8f0;
    border-radius: 16px;
    padding: 40px;
    position: relative;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.card-accent-line {
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 4px;
    border-radius: 16px 16px 0 0;
}

.target-g9 .card-accent-line { background: #3b82f6; }
.target-g10 .card-accent-line { background: #10b981; }

.grade-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.05), 0 10px 10px -5px rgba(0, 0, 0, 0.03);
}

.class-tag {
    display: inline-block;
    padding: 4px 12px;
    background: #f1f5f9;
    color: #475569;
    border-radius: 6px;
    font-size: 0.8rem;
    font-weight: 700;
    margin-bottom: 20px;
}

.class-tag.hot-tag {
    background: #ecfdf5;
    color: #059669;
}

.grade-card h3 {
    font-size: 1.6rem;
    color: #0f172a;
    margin-bottom: 15px;
}

.grade-card p {
    color: #64748b;
    font-size: 1.05rem;
    line-height: 1.6;
    margin-bottom: 30px;
}

.grade-action-btn {
    text-decoration: none;
    font-weight: 600;
    font-size: 1rem;
    color: #2563eb;
    transition: color 0.2s;
}

.target-g10 .grade-action-btn {
    color: #10b981;
}

.grade-card:hover .grade-action-btn {
    text-decoration: underline;
}

/* Responsive updates for grid layout */
@media (max-width: 768px) {
    .grade-selection-grid {
        grid-template-columns: 1fr;
    }
    .hero-premium h1 {
        font-size: 2.5rem;
    }
    .btn-hero-secondary {
        margin-left: 0;
        margin-top: 15px;
        display: block;
    }
}

/* ==========================================================================
   4. DASHBOARD GRID SYSTEM (GRADE 9 & GRADE 10)
   ========================================================================== */
.grade-banner {
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
    color: var(--bg-white);
    padding: 60px 0;
    text-align: center;
}

.grade-banner h1 {
    font-size: 2.4rem;
    margin-bottom: 10px;
}

.page-layout {
    padding: 50px 20px;
}

.section-title {
    font-size: 1.8rem;
    margin-bottom: 30px;
    color: var(--secondary);
}

.chapter-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 25px;
}

.chapter-card {
    background-color: var(--bg-white);
    padding: 30px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
    transition: var(--transition);
}

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

.unit-tag {
    display: inline-block;
    background: #f1f5f9;
    color: var(--text-light);
    padding: 4px 10px;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    margin-bottom: 15px;
}

.chapter-card h3 {
    margin-bottom: 10px;
    color: var(--secondary);
}

.chapter-card p {
    color: var(--text-light);
    font-size: 0.95rem;
}

.chapter-link {
    display: inline-block;
    margin-top: 20px;
    color: var(--primary);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
}

/* ==========================================================================
   5. FLOATING-LABEL STUDENT LOGIN PORTAL
   ========================================================================== */
.login-wrapper {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: calc(100vh - 140px);
    padding: 40px 20px;
}

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

.login-header {
    text-align: center;
    margin-bottom: 35px;
}

.login-header h2 {
    color: var(--secondary);
    margin-bottom: 8px;
}

.login-header p {
    color: var(--text-light);
    font-size: 0.95rem;
}

.login-form .input-group {
    position: relative;
    margin-bottom: 30px;
}

.login-form .input-group input {
    width: 100%;
    padding: 12px 0;
    font-size: 1rem;
    color: var(--text-dark);
    border: none;
    border-bottom: 2px solid var(--border);
    outline: none;
    background: transparent;
    transition: var(--transition);
}

.login-form .input-group label {
    position: absolute;
    top: 12px;
    left: 0;
    font-size: 1rem;
    color: var(--text-light);
    pointer-events: none;
    transition: var(--transition);
}

/* Active Float Transforms */
.login-form .input-group input:focus ~ label,
.login-form .input-group input:valid ~ label {
    top: -12px;
    font-size: 0.85rem;
    color: var(--primary);
    font-weight: 600;
}

.login-form .input-group .bar {
    position: absolute;
    bottom: 0;
    left: 0;
    height: 2px;
    width: 0;
    background-color: var(--primary);
    transition: var(--transition);
}

.login-form .input-group input:focus ~ .bar {
    width: 100%;
}

.form-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.9rem;
    margin-bottom: 25px;
}

.remember-me {
    color: var(--text-light);
    display: flex;
    align-items: center;
    gap: 6px;
    cursor: pointer;
}

.forgot-link {
    color: var(--primary);
    text-decoration: none;
}

.login-submit-btn {
    width: 100%;
    background-color: var(--primary);
    color: var(--bg-white);
    border: none;
    padding: 14px;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
}

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

.login-footer {
    text-align: center;
    margin-top: 25px;
    font-size: 0.9rem;
    color: var(--text-light);
}

.login-footer a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
}

/* ==========================================================================
   6. INTERACTIVE STUDENT SUPPORT DESK (TAB COMPONENT)
   ========================================================================== */
.contact-wrapper {
    display: grid;
    grid-template-columns: 1fr 1.3fr;
    gap: 50px;
    padding: 60px 20px;
    align-items: start;
}

.contact-sidebar h2 {
    font-size: 2rem;
    color: var(--secondary);
    margin-bottom: 15px;
}

.contact-sidebar > p {
    color: var(--text-light);
    margin-bottom: 30px;
}

.support-channels {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.channel-card {
    background-color: var(--bg-white);
    padding: 20px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
}

.channel-card h4 {
    margin-bottom: 6px;
    color: var(--secondary);
}

.channel-card p {
    font-size: 0.9rem;
    color: var(--text-light);
}

/* Tab Setup Container */
.contact-portal {
    background-color: var(--bg-white);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
    padding: 35px;
    overflow: hidden;
}

/* Hide System Radio Controls completely */
input[name="desk-toggle"] {
    display: none;
}

.portal-tabs {
    display: flex;
    border-bottom: 2px solid var(--border);
    margin-bottom: 30px;
    gap: 10px;
}

.portal-tab-btn {
    padding: 12px 20px;
    font-weight: 600;
    cursor: pointer;
    color: var(--text-light);
    transition: var(--transition);
    border-bottom: 2px solid transparent;
    margin-bottom: -2px;
}

/* Content Panel Base State */
.portal-panel {
    display: none;
}

.portal-panel h3 {
    margin-bottom: 8px;
    color: var(--secondary);
}

.portal-panel > p {
    color: var(--text-light);
    font-size: 0.95rem;
    margin-bottom: 25px;
}

/* Standard Tab Forms */
.portal-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 20px;
}

.portal-group label {
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--secondary);
}

.portal-group input,
.portal-group select,
.portal-group textarea {
    padding: 12px;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 0.95rem;
    outline: none;
    transition: var(--transition);
}

.portal-group input:focus,
.portal-group select:focus,
.portal-group textarea:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.star-rating-row {
    display: flex;
    flex-direction: column;
    gap: 10px;
    padding: 5px 0;
}

.star-rating-row label {
    font-weight: 400;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
}

.portal-submit {
    background-color: var(--primary);
    color: var(--bg-white);
    border: none;
    padding: 12px 24px;
    font-weight: 600;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
}

.portal-submit:hover {
    background-color: var(--primary-dark);
}

.portal-submit.success-theme {
    background-color: var(--success);
}

.portal-submit.success-theme:hover {
    filter: brightness(0.9);
}

/* ==========================================================================
   7. CSS LOGIC GATES (THE SELECTOR ENGINE)
   ========================================================================== */
#desk-help:checked ~ .portal-tabs .tab-help-label {
    color: var(--primary);
    border-bottom-color: var(--primary);
}

#desk-feedback:checked ~ .portal-tabs .tab-feedback-label {
    color: var(--success);
    border-bottom-color: var(--success);
}

#desk-help:checked ~ .panel-help {
    display: block;
}

#desk-feedback:checked ~ .panel-feedback {
    display: block;
}

/* ==========================================================================
   8. MEDIA QUERIES (MOBILE OPTIMIZATION)
   ========================================================================== */
@media (max-width: 768px) {
    .navbar {
        flex-direction: column;
        height: auto;
        padding: 15px 20px;
        gap: 15px;
    }
    
    .nav-links {
        gap: 15px;
        flex-wrap: wrap;
        justify-content: center;
    }

    .hero h1 {
        font-size: 2.2rem;
    }

    .contact-wrapper {
        grid-template-columns: 1fr;
        gap: 40px;
    }
}