/* ==========================================================================
   DESIGN SYSTEM & VARIABLES - HIGH-END DARK EDITION
   ========================================================================== */
:root {
    --bg-primary: #0b0f19;      
    --bg-secondary: #131a2c;    
    --text-main: #f8fafc;       
    --text-muted: #94a3b8;      
    --accent-blue: #38bdf8;     
    --accent-hover: #7dd3fc;    
    --border-color: #1e293b;    

    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-serif: 'Playfair Display', Georgia, serif;
    
    --max-width: 1200px;
}

/* ==========================================================================
   BASE STYLES
   ========================================================================== */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-primary);
    color: var(--text-main);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

a {
    color: inherit;
    text-decoration: none;
    transition: color 0.2s ease-in-out;
}

h1, h2, h3, h4 {
    font-weight: 700;
    letter-spacing: -0.02em;
    line-height: 1.2;
    margin-bottom: 1rem;
    color: var(--text-main);
}

.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 2rem;
}

/* ==========================================================================
   REUSABLE BUTTON SYSTEM - SANITIZED & UNIFIED
   ========================================================================== */
.btn-primary {
    background-color: var(--accent-blue);
    color: #0b0f19; 
    padding: 0.75rem 1.5rem;
    border-radius: 6px;
    font-weight: 600;
    font-size: 0.95rem; /* Explicit unified text mapping */
    line-height: 1.2;   /* Ensures text boxes don't alter height spacing */
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.2s ease;
    border: none;
    cursor: pointer;
}

.btn-primary:hover {
    background-color: var(--accent-hover);
    color: #0b0f19;
}

.btn-secondary {
    border: 2px solid var(--border-color);
    color: var(--text-main);
    padding: 0.75rem 1.5rem;
    border-radius: 6px;
    font-weight: 600;
    font-size: 0.95rem; /* Matches primary font layout perfectly */
    line-height: 1.2;   /* Matches primary baseline height spacing */
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
    background: transparent;
    cursor: pointer;
}

.btn-secondary:hover {
    border-color: var(--text-main);
    background-color: var(--bg-secondary);
}
/* ==========================================================================
   HEADER COMPONENT
   ========================================================================== */
.site-header {
    background-color: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1000;
}
.header-wrap {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 80px;
}
.logo a {
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: -0.03em;
    text-transform: uppercase;
}
.logo span {
    color: var(--accent-blue);
}
.main-nav ul {
    display: flex;
    list-style: none;
    gap: 2rem;
    align-items: center;
}
.nav-link {
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--text-muted);
}
.nav-link:hover, .nav-link.active {
    color: var(--accent-blue);
}

/* ==========================================================================
   PUBLIC LANDING PAGE (INDEX)
   ========================================================================== */
.hero-section {
    padding: 6rem 0;
    background-color: var(--bg-primary);
}
.hero-grid {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 4rem;
    align-items: center;
}
.hero-tagline {
    color: var(--accent-blue);
    font-weight: 700;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    display: block;
    margin-bottom: 1rem;
}
.hero-content h1 {
    font-size: 3.5rem;
    line-height: 1.1;
    margin-bottom: 1.5rem;
}
.hero-lead {
    font-size: 1.2rem;
    color: var(--text-muted);
    margin-bottom: 2.5rem;
    max-width: 540px;
}
.hero-actions {
    display: flex;
    gap: 1rem;
}
.media-placeholder {
    background-color: var(--bg-secondary);
    border: 2px dashed var(--border-color);
    border-radius: 8px;
    aspect-ratio: 4 / 5;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    font-weight: 600;
}
.pillars-section {
    padding: 5rem 0;
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
}
.section-title {
    font-size: 2rem;
    text-align: center;
    margin-bottom: 3rem;
}
.pillars-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2.5rem;
}
.pillar-card {
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    padding: 3rem;
    border-radius: 8px;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.pillar-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.3);
}
.card-icon {
    color: var(--accent-blue);
    font-weight: 700;
    text-transform: uppercase;
    font-size: 0.75rem;
    margin-bottom: 1rem;
    letter-spacing: 0.05em;
}
.pillar-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}
.pillar-card p {
    color: var(--text-muted);
    margin-bottom: 2rem;
}
.card-link {
    color: var(--accent-blue);
    font-weight: 600;
}
.card-link:hover {
    color: var(--accent-hover);
}

/* ==========================================================================
   AUTHENTICATION LAYOUT (LOGIN)
   ========================================================================== */
.login-wrapper {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--bg-primary);
    padding: 2rem;
}
.login-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    width: 100%;
    max-width: 420px;
    padding: 3rem 2.5rem;
    border-radius: 8px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}
.login-header {
    text-align: center;
    margin-bottom: 2.5rem;
}
.login-header h2 {
    font-size: 1.75rem;
    margin-bottom: 0.5rem;
}
.login-header p {
    color: var(--text-muted);
    font-size: 0.9rem;
}
.form-group {
    margin-bottom: 1.5rem;
}
.form-group label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-main);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}
.form-control {
    width: 100%;
    padding: 0.75rem 1rem;
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-main);
    font-family: var(--font-sans);
    font-size: 1rem;
    transition: border-color 0.2s ease;
}
.form-control:focus {
    outline: none;
    border-color: var(--accent-blue);
}
.btn-submit {
    width: 100%;
    cursor: pointer;
    margin-top: 1rem;
    text-align: center;
}
.alert-danger {
    background-color: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.2);
    color: #f87171;
    padding: 0.75rem 1rem;
    border-radius: 6px;
    font-size: 0.9rem;
    margin-bottom: 1.5rem;
}

/* ==========================================================================
   ADMIN DASHBOARD WORKSPACE LAYOUT
   ========================================================================== */
.admin-layout {
    display: grid;
    grid-template-columns: 260px 1fr;
    min-height: 100vh;
}
.sidebar {
    background-color: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    padding: 2rem 1.5rem;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}
.sidebar-brand h2 {
    font-size: 1.2rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 2.5rem;
}
.sidebar-brand span {
    color: var(--accent-blue);
}
.sidebar-menu {
    list-style: none;
}
.sidebar-item {
    margin-bottom: 0.5rem;
}
.sidebar-link {
    display: block;
    padding: 0.75rem 1rem;
    border-radius: 6px;
    font-weight: 600;
    color: var(--text-muted);
    transition: all 0.2s ease;
}
.sidebar-link:hover, .sidebar-link.active {
    color: var(--text-main);
    background-color: var(--border-color);
}
.sidebar-link.logout {
    color: #ef4444;
}
.sidebar-link.logout:hover {
    background-color: rgba(239, 68, 68, 0.1);
}
.main-content {
    padding: 3rem;
    background-color: var(--bg-primary);
}
.welcome-banner {
    margin-bottom: 3rem;
}
.welcome-banner h1 {
    font-size: 2.2rem;
    margin-bottom: 0.5rem;
}
.welcome-banner p {
    color: var(--text-muted);
}
.metrics-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    margin-bottom: 4rem;
}
.metric-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    padding: 2rem;
    border-radius: 8px;
}
.metric-title {
    font-size: 0.85rem;
    text-transform: uppercase;
    color: var(--text-muted);
    letter-spacing: 0.05em;
    margin-bottom: 0.5rem;
}
.metric-value {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-main);
    line-height: 1;
}
.actions-section h3 {
    font-size: 1.25rem;
    margin-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.5rem;
}
.actions-btn-group {
    display: flex;
    gap: 1rem;
}

/* ==========================================================================
   FOOTER COMPONENT
   ========================================================================== */
.site-footer {
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 4rem 0 2rem 0;
    margin-top: 5rem;
    color: var(--text-muted);
    font-size: 0.9rem;
}
.footer-grid {
    display: grid;
    grid-template-columns: 2fr repeat(2, 1fr);
    gap: 4rem;
    margin-bottom: 3rem;
}
.footer-brand h3 {
    color: var(--text-main);
    margin-bottom: 0.5rem;
}
.footer-links h4 {
    color: var(--text-main);
    font-size: 1rem;
    margin-bottom: 1rem;
}
.footer-links ul {
    list-style: none;
}
.footer-links li {
    margin-bottom: 0.5rem;
}
.footer-links a:hover {
    color: var(--accent-blue);
}
.footer-bottom {
    border-top: 1px solid var(--border-color);
    padding-top: 2rem;
    text-align: center;
}

/* ==========================================================================
   GLOBAL RESPONSIVE DESIGN VIEWPORTS
   ========================================================================== */
@media (max-width: 768px) {
    .hero-grid, .pillars-grid, .metrics-grid, .footer-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    .hero-content h1 {
        font-size: 2.5rem;
    }
    .admin-layout {
        grid-template-columns: 1fr;
    }
    .sidebar {
        border-right: none;
        border-bottom: 1px solid var(--border-color);
    }
}

/* ==========================================================================
   COMING SOON / MAINTENANCE VIEWPORT STYLES
   ========================================================================== */
.maintenance-wrapper {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--bg-primary);
    padding: 2rem;
    text-align: center;
}

.maintenance-card {
    max-width: 640px;
    padding: 2rem;
}

.maintenance-logo {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.03em;
    text-transform: uppercase;
    margin-bottom: 3rem;
    color: var(--text-main);
}

.maintenance-logo span {
    color: var(--accent-blue);
}

.maintenance-tagline {
    color: var(--accent-blue);
    font-weight: 700;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    display: block;
    margin-bottom: 1.5rem;
}

.maintenance-card h1 {
    font-size: 3.5rem;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    font-family: var(--font-sans);
}

.maintenance-lead {
    font-size: 1.15rem;
    color: var(--text-muted);
    margin-bottom: 3rem;
}

/* Status Alert Container with Glowing Pulse Element */
.status-notification {
    display: inline-flex;
    align-items: center;
    gap: 1rem;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    padding: 0.75rem 1.5rem;
    border-radius: 50px;
    text-align: left;
}

.status-notification p {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-main);
}

.pulse-indicator {
    width: 10px;
    height: 10px;
    background-color: #22c55e;
    border-radius: 50%;
    display: inline-block;
    box-shadow: 0 0 0 0 rgba(34, 197, 94, 0.7);
    animation: pulse-glow 2s infinite;
}

/* Hidden Navigation Link for Private Admin Login */
.hidden-gate {
    margin-top: 4rem;
}

.hidden-gate a {
    color: rgba(148, 163, 184, 0.15); /* Blends into dark background so only you notice it */
    font-size: 0.8rem;
    font-weight: 600;
    transition: color 0.2s ease;
}

.hidden-gate a:hover {
    color: var(--accent-blue); /* Illuminates bright blue when mouse hovers over it */
}

/* Keyframes animations for the live status pulse indicator */
@keyframes pulse-glow {
    0% {
        transform: scale(0.95);
        box-shadow: 0 0 0 0 rgba(34, 197, 94, 0.7);
    }
    70% {
        transform: scale(1);
        box-shadow: 0 0 0 10px rgba(34, 197, 94, 0);
    }
    100% {
        transform: scale(0.95);
        box-shadow: 0 0 0 0 rgba(34, 197, 94, 0);
    }
}

/* Smartphone responsive adjustments */
@media (max-width: 768px) {
    .maintenance-card h1 {
        font-size: 2.2rem;
    }
    .status-notification {
        border-radius: 8px;
        padding: 1rem;
    }
}

/* ==========================================================================
   STUDENT ACADEMY MODULE PROGRESS TRACKER
   ========================================================================== */
.progress-container {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    padding: 2rem;
    border-radius: 8px;
    max-width: 600px;
}

.progress-header {
    display: flex;
    justify-content: space-between;
    font-size: 0.95rem;
    margin-bottom: 0.75rem;
    font-weight: 600;
}

.progress-bar-bg {
    background-color: var(--border-color);
    width: 100%;
    height: 10px;
    border-radius: 50px;
    overflow: hidden;
}

.progress-bar-fill {
    background-color: var(--accent-blue);
    height: 100%;
    border-radius: 50px;
    transition: width 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ==========================================================================
   NESTED CURRICULUM CANVASES & LIGHTWEIGHT MODALS
   ========================================================================== */
.builder-module-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 2rem;
    margin-bottom: 2rem;
}

.module-card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 1.25rem;
    margin-bottom: 1.5rem;
}

.nested-lessons-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.builder-lesson-item {
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    padding: 1rem 1.5rem;
    border-radius: 6px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* Modal Popup Core Backdrop Layer */
.custom-modal-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(11, 15, 25, 0.85); /* Dark transparent dimming */
    backdrop-filter: blur(4px);
    z-index: 2000;
    display: none; /* Controlled by JavaScript visibility triggers */
    align-items: center;
    justify-content: center;
    padding: 2rem;
}

.custom-modal-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    width: 100%;
    max-width: 520px;
    padding: 2.5rem;
    border-radius: 8px;
    box-shadow: 0 30px 60px rgba(0, 0, 0, 0.6);
}

/* ==========================================================================
   ADMIN TWO-COLUMN COURSE CATALOG CARD LAYOUT
   ========================================================================== */
.course-grid-container {
    display: flex;
    flex-direction: column;
    gap: 2.5rem;
    width: 100%;
}

.course-catalog-card {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 2.5rem;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 2rem;
    align-items: start;
}

/* Left side elements container styling */
.catalog-card-left {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
    width: 100%;
}

.catalog-cover-wrapper {
    width: 100%;
    aspect-ratio: 16 / 10;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    overflow: hidden;
    background-color: var(--bg-primary);
}

.catalog-cover-wrapper img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.catalog-no-cover {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.05em;
}

/* Actions group buttons configuration layer */
.catalog-action-stack {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0.5rem;
    width: 100%;
}

.card-action-btn {
    width: 100%;
    padding: 0.5rem 1rem;
    font-size: 0.85rem;
    height: 36px;
}

.btn-danger-action {
    border-color: rgba(239, 68, 68, 0.2) !important;
    color: #f87171 !important;
}

.btn-danger-action:hover {
    background-color: rgba(239, 68, 68, 0.1) !important;
    border-color: #ef4444 !important;
}

/* Right side elements details layout styling */
.catalog-card-right {
    display: flex;
    flex-direction: column;
    min-height: 100%;
}

.catalog-card-right h2 {
    font-size: 1.5rem;
    margin-bottom: 0.75rem;
    color: var(--text-main);
}

.catalog-description-text {
    color: var(--text-muted);
    font-size: 0.95rem;
    line-height: 1.6;
    margin-bottom: 2rem;
}

/* Ensures nested editor lists display clean indentation inside the dark grid cards */
.catalog-description-text ul, 
.catalog-description-text ol {
    padding-left: 1.5rem;
    margin-top: 0.5rem;
    margin-bottom: 0.5rem;
}

.catalog-description-text li {
    margin-bottom: 0.35rem;
}

/* Metadata bottom footer placement */
.catalog-meta-footer {
    margin-top: auto; /* Pushes meta parameters to the very bottom right */
    display: flex;
    gap: 3rem;
    border-top: 1px solid var(--border-color);
    padding-top: 1.25rem;
}

.meta-pill {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
}

.meta-label {
    font-size: 0.75rem;
    text-transform: uppercase;
    color: var(--text-muted);
    letter-spacing: 0.05em;
    font-weight: 600;
}

/* Viewport responsive adjustment layout overriding for smaller screens */
@media (max-width: 900px) {
    .course-catalog-card {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    .catalog-card-left {
        max-width: 320px;
    }
    .catalog-meta-footer {
        gap: 1.5rem;
    }
}