/* 
  ShardaHub Core Design System (Production-Grade)
  Unified across all subdomains
*/

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

:root {
    /* Colors (Tech Blue Palette) */
    --bg-deep: #0f172a;
    --sidebar-bg: #1e293b;
    --card-bg: rgba(30, 41, 59, 0.6);
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;

    /* Brand Colors */
    --accent-blue: #3b82f6;
    --accent-purple: #8b5cf6;
    --accent-gold: #fbbf24;
    --accent-glow: rgba(59, 130, 246, 0.3);

    /* AI Special Highlight (Ecosystem Flagship) */
    --ai-accent: #06b6d4;
    --ai-glow: rgba(6, 182, 212, 0.5);

    /* UI tokens */
    --radius-lg: 20px;
    --radius-md: 12px;
    --transition-base: all 0.4s cubic-bezier(0.2, 0.8, 0.2, 1);
    --font-main: 'Outfit', sans-serif;
}

body {
    background-color: var(--bg-deep);
    color: var(--text-primary);
    font-family: var(--font-main);
    margin: 0;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

/* --- Premium Utilities --- */

.glass {
    background: var(--card-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid rgba(255, 255, 255, 0.08);
}

.text-gradient {
    background: linear-gradient(135deg, var(--accent-blue), var(--ai-accent));
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.glow-effect:hover {
    box-shadow: 0 0 25px var(--accent-glow);
    border-color: var(--accent-blue);
}

/* --- Global Components --- */

/* Interactive Cards */
.interactive-card {
    transition: var(--transition-base);
    border: 1px solid rgba(255, 255, 255, 0.05) !important;
}

.interactive-card:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.5), 0 0 20px var(--accent-glow);
    border-color: var(--accent-blue) !important;
}

/* Sidebar Styling */
.sidebar {
    width: 280px;
    height: 100vh;
    background: var(--sidebar-bg);
    border-right: 1px solid rgba(255, 255, 255, 0.05);
    position: fixed;
    z-index: 1050;
    padding: 0 1.5rem 2rem 1.5rem;
    /* 0 top margin/padding */
    display: flex;
    flex-direction: column;
}

.sidebar-header {
    height: 70px;
    /* Synchronized with header height */
    display: flex;
    align-items: center;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    margin-bottom: 1rem;
}

.nav-link {
    color: var(--text-secondary) !important;
    font-weight: 500;
    border-radius: var(--radius-md);
    padding: 10px 16px;
    transition: var(--transition-base);
}

.nav-link:hover,
.nav-link.active {
    color: var(--text-primary) !important;
    background: rgba(59, 130, 246, 0.1);
    transform: translateX(8px);
}

/* AI Flagship Highlight */
.nav-link-ai {
    color: var(--ai-accent) !important;
    background: rgba(6, 182, 212, 0.05);
    border: 1px solid rgba(6, 182, 212, 0.1);
}

.nav-link-ai:hover {
    background: rgba(6, 182, 212, 0.1) !important;
    box-shadow: 0 0 15px var(--ai-glow);
    border-color: var(--ai-accent);
}

.ai-badge {
    background: var(--ai-accent);
    color: var(--bg-deep);
    font-size: 0.65rem;
    font-weight: 800;
    padding: 2px 8px;
    border-radius: 20px;
    margin-left: auto;
}

/* Buttons */
.btn-info {
    background-color: var(--ai-accent);
    border-color: var(--ai-accent);
    color: var(--bg-deep);
}

.btn-info:hover {
    background-color: #0891b2;
    box-shadow: 0 0 15px var(--ai-glow);
}

.hover-bright:hover {
    color: white !important;
    filter: brightness(1.2);
}

.hover-danger:hover {
    color: #ef4444 !important;
}

/* --- Layout Support for Sidebar --- */
.main-wrapper {
    margin-left: 280px !important;
    /* Forces physical offset */
    padding: 0 4rem !important;
    /* Safety gutter */
    width: calc(100% - 280px) !important;
    /* Syncs with margin */
    box-sizing: border-box;
    transition: var(--transition-base);
    min-height: 100vh;
    position: relative;
    overflow-x: hidden;
}

/* Section Spacing Utilities */
.section-spacer {
    margin-bottom: 6rem !important;
}

.content-padding {
    padding: 0 2rem;
}

@media (max-width: 991px) {
    .main-wrapper {
        margin-left: 0;
        width: 100%;
        padding: 0 1.5rem;
    }

    .sidebar {
        transform: translateX(-100%);
        transition: var(--transition-base);
    }

    .sidebar.open {
        transform: translateX(0);
    }
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-deep);
}

::-webkit-scrollbar-thumb {
    background: var(--sidebar-bg);
    border-radius: 10px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

/* --- Curriculum Manager UI --- */
.curriculum-accordion {
    max-height: 500px;
    overflow-y: auto;
    padding-right: 5px;
}

.module-card {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 16px;
    margin-bottom: 1rem;
    overflow: hidden;
    transition: var(--transition-base);
}

.module-card:hover {
    border-color: rgba(6, 182, 212, 0.3);
}

.module-header {
    background: rgba(255, 255, 255, 0.02);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    cursor: pointer;
}

.module-card.collapsed .lessons-container {
    display: none;
}

.lesson-item {
    padding-left: 3rem !important;
    transition: var(--transition-base);
}

.lesson-item:hover {
    background: rgba(6, 182, 212, 0.05);
}

.lesson-type-icon {
    width: 30px;
    height: 30px;
    background: rgba(6, 182, 212, 0.1);
    color: var(--ai-accent);
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
}

.btn-icon-sm {
    width: 32px;
    height: 32px;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}