/* 
  SkillDev - Premium CSS Design System
  Author: Antigravity
  Theme: Neon Cyber Glass (Dark Theme)
*/

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

:root {
    --bg-main: #09080f;
    --bg-surface: rgba(20, 16, 35, 0.65);
    --bg-surface-hover: rgba(28, 22, 49, 0.85);
    --border-color: rgba(255, 255, 255, 0.08);
    --border-hover: rgba(255, 255, 255, 0.18);
    
    --primary: #8a3ffc;
    --primary-glow: rgba(138, 63, 252, 0.4);
    --secondary: #00f0ff;
    --secondary-glow: rgba(0, 240, 255, 0.3);
    
    --text-primary: #f4f3f6;
    --text-secondary: #9f9baa;
    --text-muted: #676375;
    
    --success: #24a148;
    --danger: #da1e28;
    --warning: #f1c21b;
    
    --font-heading: 'Outfit', sans-serif;
    --font-body: 'Inter', sans-serif;
    
    --card-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
    --transition-smooth: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

/* Base resets & typography */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    background-color: var(--bg-main);
    background-image: 
        radial-gradient(circle at 10% 20%, rgba(138, 63, 252, 0.08) 0%, transparent 40%),
        radial-gradient(circle at 90% 80%, rgba(0, 240, 255, 0.05) 0%, transparent 40%);
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 15px;
    line-height: 1.6;
    min-height: 100vh;
    padding-bottom: 60px;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 600;
    letter-spacing: -0.02em;
    color: #ffffff;
}

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

a:hover {
    color: #ffffff;
}

/* App Layout */
.app-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Premium Navigation Header */
header.app-header {
    background: rgba(9, 8, 15, 0.7);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
    margin-bottom: 40px;
}

.nav-wrapper {
    height: 70px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-family: var(--font-heading);
    font-size: 24px;
    font-weight: 800;
    background: linear-gradient(135deg, #ffffff 30%, var(--primary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.logo i {
    background: linear-gradient(135deg, var(--secondary) 0%, var(--primary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 20px;
}

/* Notifications/Alerts */
.alert {
    padding: 16px 20px;
    border-radius: 12px;
    margin-bottom: 24px;
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 500;
    animation: slideIn 0.3s ease-out;
}

.alert-success {
    background: rgba(36, 161, 72, 0.15);
    border: 1px solid rgba(36, 161, 72, 0.3);
    color: #4ade80;
}

.alert-error {
    background: rgba(218, 30, 40, 0.15);
    border: 1px solid rgba(218, 30, 40, 0.3);
    color: #f87171;
}

/* Glass Card styles */
.glass-card {
    background: var(--bg-surface);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    box-shadow: var(--card-shadow);
    padding: 30px;
    transition: var(--transition-smooth);
}

.glass-card:hover {
    border-color: var(--border-hover);
}

/* Primary buttons with glow & gradients */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 20px;
    border-radius: 10px;
    font-family: var(--font-heading);
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: var(--transition-smooth);
    font-size: 14px;
    outline: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, #6929c4 100%);
    color: #ffffff;
    box-shadow: 0 4px 14px 0 var(--primary-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px 0 var(--primary-glow);
    filter: brightness(1.1);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.15);
    transform: translateY(-2px);
}

.btn-danger {
    background: rgba(218, 30, 40, 0.15);
    border: 1px solid rgba(218, 30, 40, 0.4);
    color: #f87171;
}

.btn-danger:hover {
    background: var(--danger);
    color: #ffffff;
    transform: translateY(-2px);
}

.btn-sm {
    padding: 6px 12px;
    font-size: 12px;
    border-radius: 6px;
}

.btn-icon {
    padding: 8px;
    border-radius: 8px;
    line-height: 1;
}

/* Premium Form Elements */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-family: var(--font-heading);
    font-weight: 500;
    margin-bottom: 8px;
    color: var(--text-secondary);
}

.form-control {
    width: 100%;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 12px 16px;
    color: #ffffff;
    font-family: var(--font-body);
    font-size: 14px;
    transition: var(--transition-smooth);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-glow);
}

textarea.form-control {
    min-height: 100px;
    resize: vertical;
}

/* Search Bar (Dashboard) */
.search-container {
    margin-bottom: 30px;
}

.search-box-wrapper {
    position: relative;
    display: flex;
    gap: 12px;
}

.search-input-wrapper {
    position: relative;
    flex-grow: 1;
}

.search-input-wrapper i {
    position: absolute;
    left: 16px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    font-size: 18px;
}

.search-input-wrapper input {
    padding-left: 48px;
}

/* Course Grid */
.course-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 24px;
}

.course-card {
    display: flex;
    flex-direction: column;
    height: 100%;
}

.course-card-header {
    margin-bottom: 12px;
}

.course-card-title {
    font-size: 20px;
    margin-bottom: 8px;
    font-weight: 700;
    line-height: 1.3;
}

.course-card-body {
    flex-grow: 1;
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 20px;
}

.course-card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-top: 1px solid var(--border-color);
    padding-top: 16px;
}

.course-stats {
    font-size: 12px;
    color: var(--text-muted);
    display: flex;
    gap: 12px;
}

/* Course view / builder details */
.builder-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 32px;
    flex-wrap: wrap;
    gap: 20px;
}

.builder-title-area {
    max-width: 70%;
}

.builder-title-area h1 {
    font-size: 32px;
    margin-bottom: 8px;
    line-height: 1.2;
}

.builder-actions {
    display: flex;
    gap: 12px;
}

/* Course Builder Outline */
.chapters-container {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.chapter-wrapper {
    background: rgba(22, 18, 38, 0.4);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 20px;
    transition: var(--transition-smooth);
}

.chapter-wrapper:hover {
    border-color: rgba(255, 255, 255, 0.15);
    background: rgba(22, 18, 38, 0.55);
}

.chapter-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.chapter-title-group {
    display: flex;
    align-items: center;
    gap: 12px;
}

.chapter-drag-handle {
    cursor: grab;
    color: var(--text-muted);
    font-size: 18px;
}

.chapter-title {
    font-size: 18px;
    font-weight: 700;
}

.chapter-actions {
    display: flex;
    gap: 8px;
    align-items: center;
}

/* Lesson Items */
.lessons-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.lesson-item {
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 12px 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--transition-smooth);
}

.lesson-item:hover {
    border-color: rgba(255, 255, 255, 0.15);
    background: rgba(255, 255, 255, 0.03);
    transform: translateX(4px);
}

.lesson-info {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-grow: 1;
    min-width: 0; /* truncate helper */
}

.lesson-drag-handle {
    cursor: grab;
    color: var(--text-muted);
    font-size: 14px;
}

.lesson-icon {
    width: 32px;
    height: 32px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    flex-shrink: 0;
}

/* Brand Link icons */
.lesson-icon.youtube {
    background: rgba(255, 0, 0, 0.15);
    color: #ff4a4a;
}
.lesson-icon.vimeo {
    background: rgba(26, 183, 234, 0.15);
    color: #1ab7ea;
}
.lesson-icon.google_drive {
    background: rgba(52, 168, 83, 0.15);
    color: #34a853;
}
.lesson-icon.onedrive {
    background: rgba(0, 120, 215, 0.15);
    color: #0078d7;
}
.lesson-icon.article {
    background: rgba(138, 63, 252, 0.15);
    color: #a76eff;
}
.lesson-icon.other {
    background: rgba(255, 255, 255, 0.08);
    color: var(--text-secondary);
}

.lesson-title-link {
    font-weight: 500;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.lesson-item:hover .lesson-title-link {
    color: var(--secondary);
}

.lesson-actions {
    display: flex;
    gap: 8px;
    flex-shrink: 0;
}

/* Modals */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.75);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

.modal-overlay.active {
    opacity: 1;
    pointer-events: all;
}

.modal-box {
    background: rgba(20, 16, 35, 0.95);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    width: 100%;
    max-width: 600px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.5);
    transform: translateY(20px);
    transition: transform 0.3s ease;
    overflow: hidden;
}

.modal-overlay.active .modal-box {
    transform: translateY(0);
}

.modal-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h3 {
    font-size: 20px;
}

.modal-close {
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 20px;
    cursor: pointer;
    transition: var(--transition-smooth);
}

.modal-close:hover {
    color: #ffffff;
}

.modal-body {
    padding: 24px;
}

.modal-footer {
    padding: 16px 24px;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: flex-end;
    gap: 12px;
}


/* Animations */
@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Responsive Grid/Flex tweaks */
@media (max-width: 768px) {
    .builder-header {
        flex-direction: column;
        align-items: stretch;
    }
    
    .builder-title-area {
        max-width: 100%;
    }
    
    .builder-actions {
        margin-top: 12px;
        width: 100%;
        justify-content: flex-start;
    }
}