:root {
    --bg-primary: #0a0a0a; /* True minimal black */
    --bg-secondary: #141414; /* Slight charcoal */
    --bg-glass: rgba(25, 25, 25, 0.6);
    --bg-glass-hover: rgba(35, 35, 35, 0.8);
    --text-primary: #FFFFFF;
    --text-secondary: #9ca3af; /* Silver/Grey */
    --accent-primary: #e5e7eb; /* Silver highlight */
    --accent-secondary: #d1d5db;
    --accent-glow: rgba(229, 231, 235, 0.4); /* Stronger silver glow */
    --accent-gradient: linear-gradient(135deg, #4b5563, #1f2937); /* Minimal gradient */
    --success: #10b981;
    --danger: #f43f5e;
    --warning: #f59e0b;
    --gold: #e5e7eb; /* overriding gold and orange to monochrome */
    --orange: #9ca3af;
    --border-color: rgba(255, 255, 255, 0.1);
    --border-highlight: rgba(255, 255, 255, 0.2);
    
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
    --shadow-glass: 0 4px 12px rgba(0, 0, 0, 0.5), inset 0 0 0 1px var(--border-color); 
    --shadow-glow: 0 0 10px var(--accent-glow), inset 0 0 0 1px var(--accent-primary);
    
    --radius-md: 6px; /* Smooth professional look */
    --radius-lg: 8px; 
    --transition: all 0.2s ease-out;
    
    --font-heading: 'Outfit', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
}

/* --- LIGHT MODE (Silver & Golden) --- */
:root[data-theme="light"] {
    --bg-primary: #e5e7eb; /* Silver */
    --bg-secondary: #f3f4f6; /* Light Silver */
    --bg-glass: rgba(255, 255, 255, 0.85);
    --bg-glass-hover: #ffffff;
    --text-primary: #111827; /* Rich Black */
    --text-secondary: #4b5563; /* Medium grey */
    --accent-primary: #111827; /* Black highlight */
    --accent-secondary: #374151; /* Dark Grey Highlight */
    --accent-glow: rgba(17, 24, 39, 0.4); /* Stronger charcoal glow */
    --accent-gradient: linear-gradient(135deg, #111827, #4b5563);
    --border-color: rgba(17, 24, 39, 0.15);
    --border-highlight: rgba(17, 24, 39, 0.3);
    
    --shadow-glass: 0 4px 6px -1px rgba(0, 0, 0, 0.05), inset 0 0 0 1px var(--border-color); 
    --shadow-glow: 0 0 15px var(--accent-glow), inset 0 0 0 1px var(--accent-primary);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body {
    font-family: var(--font-mono);
    font-size: 14px;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    overflow: hidden;
    letter-spacing: 0.02em;
}

:root[data-theme="light"] body {
    background-color: var(--bg-primary);
}
h1, h2, h3, h4, h5, h6 { font-family: var(--font-heading); font-weight: 800; letter-spacing: -0.02em; }

/* Helpers */
.mt-2 { margin-top: 16px; }
.text-center { text-align: center; }
.text-gold { color: var(--gold); }
.text-orange { color: var(--orange); }
.text-accent { color: var(--accent-primary); }
.text-danger { color: var(--danger); }
.w-100 { width: 100%; }
.flex-col { display: flex; flex-direction: column; }

.glass-panel {
    background: var(--bg-glass);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    border: none;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-glass);
    position: relative;
    overflow: hidden;
}

.glass-input {
    width: 100%;
    background: rgba(15, 23, 42, 0.5);
    border: 1px solid var(--border-color);
    color: white;
    padding: 12px 18px;
    border-radius: var(--radius-md);
    font-family: inherit;
    outline: none;
    transition: var(--transition);
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.2);
}
.glass-input:focus { 
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.2), inset 0 2px 4px rgba(0,0,0,0.2); 
}

:root[data-theme="light"] .glass-input {
    background: rgba(255, 255, 255, 0.8);
    color: var(--text-primary);
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.05);
}
:root[data-theme="light"] .glass-input:focus {
    box-shadow: 0 0 0 3px rgba(14, 165, 233, 0.2), inset 0 2px 4px rgba(0,0,0,0.05); 
}

/* Buttons */
.btn-primary, .btn-secondary, .btn-icon {
    font-family: inherit;
    cursor: pointer;
    border-radius: 8px;
    transition: var(--transition);
    border: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}
.btn-primary {
    background: var(--accent-gradient);
    color: white;
    padding: 12px 24px;
    font-weight: 600;
    box-shadow: 0 4px 10px rgba(0,0,0,0.3);
}
.btn-primary:hover { 
    transform: translateY(-2px); 
    box-shadow: var(--shadow-glow); 
}
.btn-secondary {
    background: rgba(255,255,255,0.05);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 12px 24px;
}
.btn-secondary:hover { 
    background: rgba(255,255,255,0.1); 
    border-color: var(--border-highlight);
}
.btn-icon {
    background: transparent;
    color: var(--text-secondary);
    font-size: 18px;
    padding: 10px;
}
.btn-icon:hover { 
    color: var(--accent-primary); 
    background: rgba(139, 92, 246, 0.1); 
    transform: scale(1.05);
}

/* Layout */
.app-container { display: flex; height: 100vh; max-width: 1600px; margin: 0 auto; transition: opacity 0.5s; opacity: 1;}

.login-overlay { position: fixed; inset: 0; background: var(--bg-primary); z-index: 9999; display: flex; align-items: center; justify-content: center; opacity: 0; pointer-events: none; transition: opacity 0.3s; }
.login-overlay.active { opacity: 1; pointer-events: auto; }

/* Sidebar */
.sidebar { width: 280px; padding: 24px; display: flex; flex-direction: column; border-right: 1px solid var(--border-color); z-index: 10; }
.logo { font-size: 24px; font-weight: 700; margin-bottom: 30px; display: flex; gap:10px; }
.logo i { color: var(--accent-primary); }

.user-stats { margin-bottom: 24px; padding: 16px; font-size: 14px; }
.stat-row { display: flex; justify-content: space-between; margin-bottom: 12px; }
.stat-item { display: flex; align-items: center; gap: 10px; }
.stat-item i { font-size: 20px; }
.stat-value { display: block; font-weight: 700; font-size: 16px; }
.stat-label { color: var(--text-secondary); font-size: 11px; text-transform: uppercase; }

.xp-bar-wrapper { height: 6px; background: rgba(0,0,0,0.4); border-radius: 3px; overflow: hidden; }
.xp-bar { height: 100%; width: 0%; background: var(--gold); transition: width 0.5s; }

#semester-nav { flex-grow: 1; overflow-y: auto; overflow-x: hidden; display: flex; flex-direction: column; gap: 6px; }
.nav-divider { font-size: 11px; color: var(--text-secondary); font-weight: 600; text-transform: uppercase; margin: 15px 0 5px 5px; letter-spacing: 0.1em; }
.nav-divider::before { content: '// '; color: var(--accent-primary); }
.nav-divider { font-size: 12px; color: var(--text-secondary); font-weight: 600; text-transform: uppercase; margin: 15px 0 5px 5px; }

.nav-item {
    padding: 14px 18px; border-radius: var(--radius-md); color: var(--text-secondary); text-decoration: none; font-weight: 500;
    display: flex; justify-content: space-between; align-items: center; transition: var(--transition);
    position: relative;
    overflow: hidden;
}
.nav-item::before {
    content: ''; position: absolute; inset: 0; background: var(--accent-gradient); opacity: 0; transition: var(--transition); z-index: -1;
}
.nav-item:hover { color: white; transform: translateX(4px); background: rgba(255,255,255,0.03);}
.nav-item.active { color: white; box-shadow: var(--shadow-md); border: 1px solid var(--border-highlight);}
.nav-item.active::before { opacity: 1; }

:root[data-theme="light"] .nav-item:hover { color: var(--text-primary); background: rgba(0,0,0,0.04);}
:root[data-theme="light"] .nav-item.active { color: white; }
:root[data-theme="light"] .nav-item.active::before { opacity: 1; }
:root[data-theme="light"] .btn-secondary { background: rgba(0,0,0,0.03); }
:root[data-theme="light"] .btn-secondary:hover { background: rgba(0,0,0,0.05); }

.sidebar-footer { display: flex; justify-content: space-around; padding-top: 15px; border-top: 1px solid var(--border-color); }

/* Main Content */
.main-content {
    flex-grow: 1; padding: 40px; overflow-y: auto;
}

.top-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 30px; }
.top-header h1 { font-size: 36px; font-weight: 800; text-shadow: 0 0 15px var(--accent-glow); color: var(--text-primary); }
.subtitle { color: var(--text-secondary); font-size: 15px; }
.timer-btn { font-size: 18px; border-radius: 30px; }

/* Dashboard */
.dashboard-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 24px; }
.dash-card { padding: 24px; transition: var(--transition); border: 1px solid transparent; }
.dash-card:hover { box-shadow: var(--shadow-glow); border-color: var(--accent-primary); transform: translateY(-2px); }
.dash-card h3 { margin-bottom: 20px; color: var(--text-secondary); font-weight: 600; font-size: 18px; text-transform: uppercase; letter-spacing: 1px; }
.chart-container { height: 200px; position: relative; width: 100%; display: flex; justify-content: center; filter: drop-shadow(0 0 15px var(--accent-glow)); }
.huge-text { font-family: var(--font-mono); font-size: 64px; font-weight: 800; color: var(--text-primary); text-shadow: 0 0 25px var(--accent-glow); }

.target-setup { margin-bottom: 20px; }
.target-setup label { display: block; margin-bottom: 8px; color: var(--text-secondary); font-size: 14px;}
.target-stats { display: flex; justify-content: space-around; background: rgba(0,0,0,0.2); padding: 15px; border-radius: 12px; }
.t-stat { text-align: center; }
.t-val { display: block; font-size: 32px; font-weight: 700; text-shadow: 0 0 15px var(--accent-glow); color: var(--text-primary); }
.t-label { font-size: 12px; color: var(--text-secondary); text-transform: uppercase; }

/* Dashboard Enhancements */
.quick-stats { display: flex; gap: 12px; }
.stat-box { background: rgba(0,0,0,0.2); padding: 12px; border-radius: 8px; flex: 1; text-align: center; border: 1px solid var(--border-color); }
.stat-box span { display: block; font-size: 20px; font-weight: 700; color: var(--text-primary); margin-bottom: 4px; font-family: var(--font-mono); }
.stat-box label { font-size: 10px; color: var(--text-secondary); text-transform: uppercase; letter-spacing: 1px; }

/* Heatmap */
.heatmap-wrapper { overflow-x: auto; padding-bottom: 10px; }
.heatmap-wrapper::-webkit-scrollbar { height: 4px; }
.heatmap-wrapper::-webkit-scrollbar-thumb { background: rgba(179, 102, 255, 0.4); border-radius: 2px; }
.heatmap { 
    display: grid; 
    grid-template-rows: repeat(7, 1fr); 
    grid-auto-flow: column; 
    gap: 4px; 
    margin-top: 10px; 
}
.heatmap-cell {
    width: 14px; height: 14px; 
    border-radius: 3px; 
    background: rgba(255,255,255,0.03); 
    transition: var(--transition);
}
.heatmap-cell:hover { transform: scale(1.2); z-index: 2; box-shadow: 0 0 8px var(--accent-primary); border: 1px solid rgba(255,255,255,0.5); }
.heatmap-cell[data-level="1"] { background: rgba(179, 102, 255, 0.3); }
.heatmap-cell[data-level="2"] { background: rgba(179, 102, 255, 0.6); }
.heatmap-cell[data-level="3"] { background: rgba(179, 102, 255, 1); box-shadow: 0 0 5px rgba(179, 102, 255, 0.4); }

:root[data-theme="light"] .heatmap-cell { background: rgba(0,0,0,0.03); border: 1px solid rgba(0,0,0,0.05); }
:root[data-theme="light"] .heatmap-cell[data-level="1"] { background: rgba(14, 165, 233, 0.3); border-color: rgba(14, 165, 233, 0.4); }
:root[data-theme="light"] .heatmap-cell[data-level="2"] { background: rgba(14, 165, 233, 0.6); border-color: rgba(14, 165, 233, 0.7); }
:root[data-theme="light"] .heatmap-cell[data-level="3"] { background: rgba(14, 165, 233, 1); box-shadow: 0 0 5px rgba(14, 165, 233, 0.4); border-color: rgba(14, 165, 233, 1); }

.heatmap-legend { display: flex; align-items: center; justify-content: flex-end; gap: 4px; margin-top: 8px; color: var(--text-secondary); }
.legend-color { width: 10px; height: 10px; border-radius: 2px; }

/* Up Next */
.up-next-list { display: flex; gap: 15px; margin-top: 10px; overflow-x: auto; padding-bottom: 5px; }
.up-next-list::-webkit-scrollbar { height: 4px; }
.up-next-list::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.2); }
.up-next-card { 
    background: rgba(0,0,0,0.3); border: 1px solid var(--border-color);
    padding: 18px; border-radius: 12px; min-width: 280px; flex-shrink: 0;
    transition: var(--transition); display: flex; flex-direction: column; 
}
.up-next-card:hover { border-color: var(--accent-primary); transform: translateY(-3px); background: rgba(179, 102, 255, 0.05); }
.up-course-tag { font-size: 11px; color: var(--accent-primary); font-weight: 700; text-transform: uppercase; margin-bottom: 5px; text-shadow: 0 0 8px var(--accent-glow); }
.up-topic-title { font-size: 15px; font-weight: 600; color: white; line-height: 1.4; margin-bottom: 12px; }
.up-topic-btn { margin-top: auto; font-size: 12px; padding: 6px 12px; border-radius: 6px; background: rgba(255,255,255,0.05); color: var(--text-secondary); border: 1px solid transparent; cursor: pointer; transition: all 0.2s;}
.up-topic-btn:hover { border-color: var(--accent-primary); color: var(--accent-primary); }

:root[data-theme="light"] .up-next-card { background: rgba(255,255,255,0.7); }
:root[data-theme="light"] .up-topic-title { color: var(--text-primary); }
:root[data-theme="light"] .up-topic-btn { background: rgba(0,0,0,0.03); }

/* Quick Actions alignment */
.dashboard-grid { align-items: start; }

/* Syllabus Courses */
.courses-container { display: grid; grid-template-columns: repeat(auto-fill, minmax(450px, 1fr)); gap: 28px; }
.course-card { 
    background: var(--bg-glass);
    border: none;
    padding: 28px; 
    border-radius: var(--radius-lg); 
    backdrop-filter: blur(16px); 
    box-shadow: var(--shadow-glass); 
    transition: var(--transition);
    position: relative;
}
.course-card:hover { border-color: rgba(139, 92, 246, 0.3); box-shadow: var(--shadow-glow); transform: translateY(-2px); }

:root[data-theme="light"] .course-card {
    background: var(--bg-glass);
    box-shadow: var(--shadow-glass);
}
:root[data-theme="light"] .course-card:hover {
    border-color: var(--accent-primary);
}
.course-header { display: flex; justify-content: space-between; align-items: center; border-bottom: 1px solid var(--border-color); padding-bottom: 18px; margin-bottom: 0px; cursor: pointer; transition: var(--transition); }
.course-header:hover { opacity: 0.9; }
.course-info { display: flex; flex-direction: column; flex-grow: 1; margin-right: 15px; }
.course-info h3 { color: var(--accent-primary); font-size: 14px; letter-spacing: 1.5px; font-weight: 700; text-transform: uppercase; margin-bottom: 4px; }
.course-info h2 { font-size: 20px; line-height: 1.3; font-weight: 600; color: #fff; }

:root[data-theme="light"] .course-info h2 { color: var(--text-primary); }

.header-right { display: flex; align-items: center; gap: 18px; }
.chevron-icon { font-size: 16px; color: var(--text-secondary); transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1); }
.course-card.expanded .chevron-icon { transform: rotate(180deg); color: var(--accent-primary); }
.course-card.expanded .course-header { border-bottom-color: var(--accent-primary); margin-bottom: 20px; }

.topics-collapse { max-height: 0; overflow: hidden; transition: max-height 0.5s cubic-bezier(0.16, 1, 0.3, 1), margin-top 0.5s, opacity 0.4s; opacity: 0; }
.course-card.expanded .topics-collapse { max-height: 2500px; opacity: 1; margin-top: 20px; }

.topic-list { list-style: none; display: flex; flex-direction: column; gap: 8px; }
.topic-item-wrapper { display: flex; align-items: center; justify-content: space-between; padding: 6px 8px; border-radius: 8px; transition: var(--transition); }
.topic-item-wrapper:hover { background: rgba(255,255,255,0.05); }
:root[data-theme="light"] .topic-item-wrapper:hover { background: rgba(0,0,0,0.05); }

.topic-item { display: flex; align-items: flex-start; gap: 12px; cursor: pointer; flex-grow: 1;}
.topic-checkbox {
    appearance: none; width: 16px; height: 16px; border: 1px solid var(--text-secondary); border-radius: 0;
    cursor: pointer; position: relative; margin-top: 3px; flex-shrink: 0; transition: var(--transition);
}
.topic-checkbox:checked { background: var(--accent-primary); border-color: var(--accent-primary); box-shadow: 0 0 12px var(--accent-glow); }
.topic-text { font-size: 14px; transition: var(--transition); line-height: 1.4; color: var(--text-primary); }
.topic-text.completed { color: var(--text-secondary); text-decoration: line-through; opacity: 0.6; }

.note-btn { background: transparent; border: none; color: var(--text-secondary); cursor: pointer; padding: 5px; border-radius: 50%; width: 28px; height: 28px; transition: var(--transition);}
.note-btn:hover { background: rgba(255,255,255,0.1); color: var(--accent-primary); }
.note-btn.has-note { color: var(--gold); }

/* Modals */
.modal-overlay { position: fixed; inset: 0; background: rgba(0,0,0,0.6); backdrop-filter: blur(5px); display: flex; align-items: center; justify-content: center; z-index: 1000; opacity: 0; pointer-events: none; transition: opacity 0.3s; }
.modal-overlay.active { opacity: 1; pointer-events: auto; }
.modal { position: relative; width: 90%; max-width: 400px; padding: 30px; text-align: center; transform: translateY(20px); transition: transform 0.3s; }
.modal-overlay.active .modal { transform: translateY(0); }
.close-modal { position: absolute; top: 15px; right: 15px; background: transparent; border: none; color: var(--text-secondary); font-size: 20px; cursor: pointer; }
.close-modal:hover { color: white; }

.timer-display { font-size: 72px; font-weight: 800; font-variant-numeric: tabular-nums; margin: 20px 0; letter-spacing: 2px; }
.timer-controls { display: flex; gap: 10px; justify-content: center; }

.notes-modal-content { text-align: left; max-width: 500px; }
.notes-modal-content h3 { margin-bottom: 20px; font-size: 18px; padding-right: 20px; color: var(--accent-primary);}
.input-group { margin-bottom: 20px; }
.input-group label { display: block; margin-bottom: 8px; font-size: 14px; color: var(--text-secondary); }

/* Celebration */
.celebration-overlay { position: fixed; inset: 0; background: rgba(0,0,0,0.8); z-index: 2000; display: flex; align-items: center; justify-content: center; opacity: 0; pointer-events: none; transition: 0.5s; }
.celebration-overlay.active { opacity: 1; pointer-events: auto; }
.celeb-content { text-align: center; transform: scale(0.8); transition: 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275); }
.celebration-overlay.active .celeb-content { transform: scale(1); }

@media (max-width: 768px) {
    .app-container { flex-direction: column; }
    .sidebar { width: 100%; border-right: none; border-bottom: 1px solid var(--border-color); padding: 15px; padding-bottom: 10px; max-height: max-content; }
    .logo { margin-bottom: 15px; }
    .user-stats { margin-bottom: 15px; padding: 12px; }
    #semester-nav { flex-direction: row; overflow-x: auto; padding-bottom: 5px; margin-bottom: 0px; }
    .nav-divider { display: none; }
    .nav-item { white-space: nowrap; margin-right: 10px; flex-shrink: 0; padding: 10px 14px;}
    .sidebar-footer { padding-top: 10px; margin-top: 10px; }
    
    .main-content { padding: 15px; }
    .top-header { flex-direction: column; align-items: stretch; gap: 12px; margin-bottom: 20px; }
    .top-header h1 { font-size: 26px; }
    .timer-btn { align-self: flex-start; padding: 10px 18px; font-size: 15px; }
    
    .dashboard-grid { grid-template-columns: 1fr; gap: 15px; }
    .dash-card { padding: 18px; }
    .huge-text { font-size: 40px; }
    .t-val { font-size: 26px; }
    
    .courses-container { grid-template-columns: 1fr; gap: 15px; }
    .course-card { padding: 18px; }
    .course-card h3 { font-size: 18px; }
    .btn-icon { padding: 8px; }
}

/* Manage Subjects */
.subject-toggle-row {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 12px 16px;
    background: rgba(255, 255, 255, 0.03);
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition);
}
.subject-toggle-row:hover {
    background: rgba(255, 255, 255, 0.08);
}
.subject-toggle-checkbox {
    width: 20px;
    height: 20px;
    accent-color: var(--accent-primary);
    cursor: pointer;
}


/* ================================================
   COURSESYNC — UNIVERSITY / COURSE SELECTORS
   ================================================ */

/* Selector Overlay Wrapper */
.selector-wrapper {
    padding: 48px 40px;
    max-width: 640px;
    width: 92%;
    text-align: center;
    align-items: center;
    gap: 0;
    animation: fadeInUp 0.35s ease-out;
}
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(24px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* Logo inside selector */
.selector-logo {
    font-size: 26px;
    font-weight: 800;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 28px;
    letter-spacing: -0.5px;
}
.selector-logo i { color: var(--accent-primary); font-size: 22px; }
.selector-logo-thin { color: var(--text-secondary); font-weight: 300; }

/* Titles */
.selector-title {
    font-size: 22px;
    color: var(--text-primary);
    margin-bottom: 6px;
}
.selector-subtitle {
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 28px;
    font-family: var(--font-mono);
}

/* Card Grid */
.selector-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(190px, 1fr));
    gap: 16px;
    width: 100%;
    margin-bottom: 4px;
}

/* Individual Cards */
.selector-card {
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 26px 18px 20px;
    cursor: pointer;
    text-align: center;
    transition: all 0.22s ease-out;
    position: relative;
    overflow: hidden;
}
.selector-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--accent-gradient);
    opacity: 0;
    transition: opacity 0.22s;
    z-index: 0;
}
.selector-card:hover {
    border-color: var(--accent-primary);
    transform: translateY(-4px);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.35);
}
.selector-card:hover::before { opacity: 0.06; }
.selector-card > * { position: relative; z-index: 1; }

.selector-card-icon {
    font-size: 30px;
    color: var(--accent-primary);
    margin-bottom: 12px;
    display: block;
    filter: drop-shadow(0 0 8px var(--accent-glow));
}
.selector-card h3 {
    font-size: 15px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 5px;
    line-height: 1.3;
}
.selector-card p {
    font-size: 11px;
    color: var(--text-secondary);
    margin-bottom: 10px;
    line-height: 1.4;
}
.selector-card-tag {
    display: inline-block;
    font-size: 11px;
    color: var(--accent-primary);
    background: rgba(255, 255, 255, 0.07);
    border: 1px solid var(--border-color);
    padding: 3px 10px;
    border-radius: 20px;
    font-family: var(--font-mono);
}

/* "Coming Soon" greyed-out cards */
.selector-card-soon {
    opacity: 0.35;
    cursor: default;
}
.selector-card-soon:hover {
    transform: none;
    border-color: var(--border-color);
    box-shadow: none;
}
.selector-card-soon:hover::before { opacity: 0; }

/* Light mode adjustments */
:root[data-theme="light"] .selector-card {
    background: rgba(0, 0, 0, 0.03);
}
:root[data-theme="light"] .selector-card:hover {
    background: rgba(0, 0, 0, 0.06);
}

/* ================================================
   SIDEBAR BREADCRUMB
   ================================================ */
.uni-breadcrumb {
    display: flex;
    align-items: center;
    gap: 5px;
    font-size: 11px;
    padding: 7px 10px;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    margin-bottom: 8px;
    min-height: 30px;
    font-family: var(--font-mono);
}
.breadcrumb-uni {
    color: var(--text-secondary);
    font-weight: 500;
}
.breadcrumb-sep {
    font-size: 8px;
    color: var(--text-secondary);
    opacity: 0.4;
}
.breadcrumb-course {
    color: var(--accent-primary);
    font-weight: 700;
    text-shadow: 0 0 8px var(--accent-glow);
}

/* Switch Course Button */
.btn-switch-course {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    border-radius: 6px;
    padding: 7px 12px;
    font-size: 11px;
    cursor: pointer;
    width: 100%;
    display: flex;
    align-items: center;
    gap: 7px;
    justify-content: center;
    transition: var(--transition);
    margin-bottom: 20px;
    font-family: var(--font-mono);
    letter-spacing: 0.03em;
}
.btn-switch-course:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
    background: rgba(255, 255, 255, 0.03);
}

/* Responsive */
@media (max-width: 768px) {
    .selector-wrapper { padding: 32px 20px; }
    .selector-grid { grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 12px; }
    .selector-card { padding: 20px 14px 16px; }
}