/* /assets/css/teacher-dashboard.css - V6.0 COMPLETE PROFESSIONAL SUITE */

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

:root {
    /* --- COLOR PALETTE (Light Default) --- */
    --mcq-primary: #4f46e5;       /* Indigo 600 */
    --mcq-primary-hover: #4338ca; /* Indigo 700 */
    --mcq-primary-light: #e0e7ff; /* Indigo 100 */
    --mcq-secondary: #64748b;     /* Slate 500 */
    --mcq-success: #10b981;       /* Emerald 500 */
    --mcq-success-light: #d1fae5;
    --mcq-danger: #ef4444;        /* Red 500 */
    --mcq-danger-light: #fee2e2;
    --mcq-warning: #f59e0b;       /* Amber 500 */
    --mcq-warning-light: #fef3c7;
    
    /* --- SURFACE COLORS --- */
    --mcq-bg: #f3f4f6;            /* Slate 100 */
    --mcq-surface: #ffffff;
    --mcq-text-main: #111827;     /* Slate 900 */
    --mcq-text-muted: #6b7280;    /* Slate 500 */
    --mcq-border: #e2e8f0;        /* Slate 200 */
    
    /* --- UTILITIES --- */
    --mcq-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px -1px rgba(0, 0, 0, 0.1);
    --mcq-shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --mcq-shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
    --mcq-radius: 16px;
    --mcq-radius-sm: 12px;
    --header-height: 70px;
    --sidebar-width: 280px;
}

/* --- DARK MODE OVERRIDES (Manual Toggle Support) --- */
[data-theme="dark"] {
    --mcq-primary: #6366f1;       /* Indigo 500 */
    --mcq-primary-hover: #818cf8;
    --mcq-primary-light: #1e293b; /* Slate 800 (background for active items) */
    --mcq-bg: #0f172a;            /* Slate 900 */
    --mcq-surface: #1e293b;       /* Slate 800 */
    --mcq-text-main: #f8fafc;     /* Slate 50 */
    --mcq-text-muted: #94a3b8;    /* Slate 400 */
    --mcq-border: #334155;        /* Slate 700 */
    --mcq-success-light: #064e3b;
    --mcq-danger-light: #450a0a;
    --mcq-warning-light: #451a03;
}

/* System Preference Fallback */
@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        --mcq-primary: #6366f1;
        --mcq-primary-hover: #818cf8;
        --mcq-primary-light: #1e293b;
        --mcq-bg: #0f172a;
        --mcq-surface: #1e293b;
        --mcq-text-main: #f8fafc;
        --mcq-text-muted: #94a3b8;
        --mcq-border: #334155;
        --mcq-success-light: #064e3b;
        --mcq-danger-light: #450a0a;
        --mcq-warning-light: #451a03;
    }
}

/* =========================================
   1. RESET & BASE
   ========================================= */
* { margin: 0; padding: 0; box-sizing: border-box; }

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--mcq-bg);
    color: var(--mcq-text-main);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

a { text-decoration: none; color: inherit; transition: 0.2s; }
ul { list-style: none; }

/* Custom Scrollbar */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: var(--mcq-bg); }
::-webkit-scrollbar-thumb { background: var(--mcq-text-muted); border-radius: 4px; opacity: 0.5; }
::-webkit-scrollbar-thumb:hover { background: var(--mcq-primary); }

/* =========================================
   2. BUTTONS & INPUTS
   ========================================= */
.mcq-btn, .btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 8px;
    padding: 10px 20px; border-radius: 10px; font-weight: 600; font-size: 0.9rem;
    border: 1px solid transparent; cursor: pointer; transition: all 0.2s ease;
    font-family: inherit; line-height: 1;
}
.btn:hover { transform: translateY(-1px); box-shadow: var(--mcq-shadow); }
.btn:active { transform: translateY(0); }

.btn-primary { background: var(--mcq-primary); color: white; border-color: var(--mcq-primary); }
.btn-primary:hover { background: var(--mcq-primary-hover); border-color: var(--mcq-primary-hover); }

.btn-outline { background: transparent; border-color: var(--mcq-border); color: var(--mcq-text-main); }
.btn-outline:hover { border-color: var(--mcq-primary); color: var(--mcq-primary); background: var(--mcq-primary-light); }

.btn-danger { background: var(--mcq-danger); color: white; }
.btn-danger:hover { background: #dc2626; }

.btn-sm { padding: 6px 12px; font-size: 0.8rem; border-radius: 8px; }
.btn-icon { padding: 8px; width: 36px; height: 36px; border-radius: 50%; }

.form-control, .mcq-form-input {
    width: 100%; padding: 12px 16px;
    border: 1px solid var(--mcq-border); border-radius: var(--mcq-radius-sm);
    background: var(--mcq-surface); color: var(--mcq-text-main);
    font-size: 0.95rem; transition: all 0.2s; font-family: inherit;
}
.form-control:focus { outline: none; border-color: var(--mcq-primary); box-shadow: 0 0 0 3px var(--mcq-primary-light); }

/* =========================================
   3. HEADER & LAYOUT
   ========================================= */
.td-header {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    height: var(--header-height);
    padding: 0 32px;
    display: flex; justify-content: space-between; align-items: center;
    border-bottom: 1px solid var(--mcq-border);
    position: sticky; top: 0; z-index: 50;
}
[data-theme="dark"] .td-header { background: rgba(30, 41, 59, 0.9); }

.header-brand h1 {
    font-size: 1.4rem; font-weight: 800; margin: 0;
    background: linear-gradient(135deg, var(--mcq-primary) 0%, #a855f7 100%);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}
.header-brand p { font-size: 0.85rem; color: var(--mcq-text-muted); margin: 0; }

.dashboard-layout {
    display: flex; min-height: calc(100vh - var(--header-height));
}

/* =========================================
   4. SIDEBAR (Desktop)
   ========================================= */
.sidebar {
    width: var(--sidebar-width);
    background: var(--mcq-surface);
    border-right: 1px solid var(--mcq-border);
    padding: 24px;
    position: sticky; top: var(--header-height);
    height: calc(100vh - var(--header-height));
    overflow-y: auto; display: none;
}
@media (min-width: 1024px) { .sidebar { display: block; } }

.sidebar-section-title {
    font-size: 0.8rem; text-transform: uppercase; letter-spacing: 1px;
    color: var(--mcq-text-muted); font-weight: 700; margin: 24px 0 12px;
    display: flex; align-items: center; gap: 8px;
}

/* Credits Card */
.credits-card {
    background: linear-gradient(135deg, #4f46e5 0%, #7c3aed 100%);
    border-radius: var(--mcq-radius); padding: 20px; color: white;
    box-shadow: 0 10px 20px rgba(79, 70, 229, 0.3); margin-bottom: 24px;
}
.credits-card h4 { font-size: 0.95rem; margin: 0 0 16px; display: flex; align-items: center; gap: 8px; }
.credits-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; }
.credit-item {
    background: rgba(255,255,255,0.15); border-radius: 8px; padding: 10px;
    text-align: center; border: 1px solid rgba(255,255,255,0.2);
}
.credit-value { display: block; font-size: 1.1rem; font-weight: 700; line-height: 1.2; }
.credit-label { font-size: 0.6rem; opacity: 0.9; text-transform: uppercase; }

/* Student List */
.student-list-item {
    display: flex; align-items: center; gap: 12px; padding: 10px;
    border-radius: var(--mcq-radius-sm); transition: 0.2s;
    border: 1px solid transparent; cursor: pointer;
}
.student-list-item:hover { background: var(--mcq-bg); border-color: var(--mcq-border); }
.student-avatar { width: 36px; height: 36px; position: relative; }
.student-avatar img { width: 100%; height: 100%; border-radius: 50%; object-fit: cover; }
.unread-badge {
    position: absolute; top: -2px; right: -2px; width: 10px; height: 10px;
    background: var(--mcq-danger); border-radius: 50%; border: 2px solid var(--mcq-surface);
}
.student-name { font-size: 0.9rem; font-weight: 600; color: var(--mcq-text-main); }
.student-email { font-size: 0.75rem; color: var(--mcq-text-muted); }

/* Quick Actions */
.quick-action-btn {
    width: 100%; display: flex; align-items: center; gap: 12px;
    padding: 12px 16px; background: var(--mcq-bg); border: 1px solid var(--mcq-border);
    border-radius: var(--mcq-radius-sm); color: var(--mcq-text-main);
    font-size: 0.9rem; font-weight: 500; cursor: pointer; margin-bottom: 8px;
    transition: 0.2s;
}
.quick-action-btn:hover {
    background: var(--mcq-primary-light); color: var(--mcq-primary); border-color: var(--mcq-primary);
}

/* =========================================
   5. MAIN CONTENT & CARDS
   ========================================= */
.main-content {
    flex: 1; padding: 32px; background: var(--mcq-bg); overflow-y: auto;
}

/* Stats Cards */
.stats-grid {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 20px; margin-bottom: 32px;
}
.stat-card {
    background: var(--mcq-surface); padding: 24px; border-radius: var(--mcq-radius);
    box-shadow: var(--mcq-shadow); border: 1px solid var(--mcq-border);
    position: relative; overflow: hidden; display: flex; align-items: center; gap: 16px;
}
.stat-card .dashicons {
    font-size: 32px; width: 32px; height: 32px; padding: 12px; box-sizing: content-box;
    border-radius: 12px;
}
.gradient-blue .dashicons { background: rgba(37, 99, 235, 0.1); color: #2563eb; }
.gradient-green .dashicons { background: rgba(16, 185, 129, 0.1); color: #10b981; }
.gradient-orange .dashicons { background: rgba(245, 158, 11, 0.1); color: #f59e0b; }
.gradient-purple .dashicons { background: rgba(124, 58, 237, 0.1); color: #7c3aed; }

.stat-value { font-size: 1.8rem; font-weight: 800; line-height: 1; display: block; color: var(--mcq-text-main); }
.stat-label { font-size: 0.9rem; color: var(--mcq-text-muted); }

/* Content Card */
.content-card {
    background: var(--mcq-surface); border-radius: var(--mcq-radius);
    padding: 32px; margin-bottom: 24px; border: 1px solid var(--mcq-border);
    box-shadow: var(--mcq-shadow);
}
.section-header {
    display: flex; justify-content: space-between; align-items: center; margin-bottom: 24px;
}
.section-header h2 { font-size: 1.25rem; font-weight: 700; color: var(--mcq-text-main); display: flex; align-items: center; gap: 10px; margin: 0; }

/* =========================================
   6. CURRICULUM DRAG & DROP
   ========================================= */
.chapter-wrapper {
    background: var(--mcq-surface); border: 1px solid var(--mcq-border);
    border-radius: var(--mcq-radius-sm); margin-bottom: 20px;
    box-shadow: var(--mcq-shadow); transition: 0.2s;
}
.chapter-header {
    background: var(--mcq-bg); padding: 16px 24px; border-bottom: 1px solid var(--mcq-border);
    display: flex; justify-content: space-between; align-items: center;
    border-radius: var(--mcq-radius-sm) var(--mcq-radius-sm) 0 0; cursor: grab;
}
.chapter-header h3 { font-size: 1rem; font-weight: 700; margin: 0; color: var(--mcq-text-main); }

.builder-item {
    padding: 12px 24px; border-bottom: 1px solid var(--mcq-border);
    background: var(--mcq-surface); display: flex; align-items: center; gap: 12px;
    cursor: grab; transition: background 0.2s;
}
.builder-item:hover { background: var(--mcq-bg); }
.builder-item:last-child { border-bottom: none; }

.item-type-badge {
    font-size: 0.65rem; font-weight: 700; text-transform: uppercase;
    padding: 2px 8px; border-radius: 4px; margin-left: auto;
}
.item-type-badge.lesson { background: var(--mcq-primary-light); color: var(--mcq-primary); }
.item-type-badge.quiz { background: var(--mcq-warning-light); color: var(--mcq-warning); }

.ui-sortable-placeholder {
    background: var(--mcq-bg) !important; border: 2px dashed var(--mcq-border) !important;
    visibility: visible !important; height: 50px; margin-bottom: 10px; border-radius: 8px;
}

/* =========================================
   7. REDESIGNED SMS MODAL (Mobile Mockup)
   ========================================= */
.sms-modal-modern .modal-body { padding: 0; background: var(--mcq-bg); }

.sms-recipient-card {
    background: var(--mcq-surface); padding: 16px 24px; border-bottom: 1px solid var(--mcq-border);
    display: flex; align-items: center; gap: 16px;
}
.sms-avatar-placeholder {
    width: 48px; height: 48px; background: linear-gradient(135deg, var(--mcq-primary) 0%, #818cf8 100%);
    color: white; border-radius: 50%; display: flex; align-items: center; justify-content: center;
    font-weight: 700; font-size: 1.2rem;
}
.sms-recipient-name { font-weight: 700; font-size: 1rem; color: var(--mcq-text-main); display: block; }
.sms-recipient-phone { font-size: 0.85rem; color: var(--mcq-text-muted); }

.sms-input-wrapper { padding: 24px; }
.sms-bubble-container {
    background: var(--mcq-surface); border: 1px solid var(--mcq-border);
    border-radius: 20px; border-bottom-right-radius: 4px;
    padding: 6px; box-shadow: var(--mcq-shadow); transition: 0.2s;
}
.sms-bubble-container:focus-within { border-color: var(--mcq-primary); box-shadow: 0 0 0 3px var(--mcq-primary-light); }

.sms-textarea {
    width: 100%; border: none; background: transparent; resize: none;
    padding: 12px; font-family: inherit; font-size: 1rem; color: var(--mcq-text-main);
    outline: none; min-height: 120px;
}

.sms-footer-meta {
    display: flex; justify-content: space-between; padding: 8px 12px; border-top: 1px dashed var(--mcq-border);
}
.char-progress-bar {
    width: 100%; height: 4px; background: var(--mcq-border); margin-top: 12px; border-radius: 2px; overflow: hidden;
}
.char-progress-fill { height: 100%; background: var(--mcq-success); width: 0%; transition: 0.3s; }

.sms-quick-chips { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }
.sms-chip {
    background: var(--mcq-surface); border: 1px solid var(--mcq-border);
    padding: 6px 14px; border-radius: 20px; font-size: 0.8rem; font-weight: 500;
    color: var(--mcq-text-muted); cursor: pointer; transition: 0.2s;
}
.sms-chip:hover { background: var(--mcq-primary-light); color: var(--mcq-primary); border-color: var(--mcq-primary); }

/* =========================================
   8. SUBMISSION HUB & ACCORDION
   ========================================= */
.lesson-accordion-item {
    background: var(--mcq-surface); border: 1px solid var(--mcq-border);
    border-radius: var(--mcq-radius-sm); margin-bottom: 12px; overflow: hidden;
}
.lesson-accordion-header {
    padding: 16px 20px; cursor: pointer; display: flex; justify-content: space-between;
    align-items: center; transition: background 0.2s;
}
.lesson-accordion-header:hover { background: var(--mcq-bg); }
.lesson-accordion-header h4 { font-size: 1rem; font-weight: 600; margin: 0; color: var(--mcq-text-main); display: flex; align-items: center; gap: 8px; }

.new-badge {
    background: var(--mcq-danger); color: white; font-size: 0.7rem; padding: 2px 8px;
    border-radius: 12px; margin-left: 8px; font-weight: 700;
}
.lesson-accordion-content { display: none; padding: 20px; border-top: 1px solid var(--mcq-border); background: var(--mcq-bg); }
.lesson-accordion-item.open .lesson-accordion-content { display: block; }

.submission-item {
    background: var(--mcq-surface); border: 1px solid var(--mcq-border);
    border-radius: 12px; padding: 16px; margin-bottom: 12px; display: flex; align-items: center; justify-content: space-between;
}
.file-link-btn {
    background: var(--mcq-primary-light); color: var(--mcq-primary); padding: 6px 12px;
    border-radius: 6px; font-weight: 500; font-size: 0.85rem; display: flex; align-items: center; gap: 6px;
}

/* =========================================
   9. CHAT WINDOW (Modern)
   ========================================= */
.chat-window-modern {
    position: fixed; bottom: 20px; right: 20px; width: 380px; height: 550px;
    background: var(--mcq-surface); border: 1px solid var(--mcq-border);
    border-radius: 16px; box-shadow: var(--mcq-shadow-lg);
    display: none; flex-direction: column; z-index: 2000; overflow: hidden;
}
.chat-header {
    background: var(--mcq-primary); color: white; padding: 16px;
    display: flex; justify-content: space-between; align-items: center;
}
.chat-messages {
    flex: 1; padding: 20px; overflow-y: auto; background: var(--mcq-bg);
    display: flex; flex-direction: column; gap: 12px;
}
.chat-message { max-width: 80%; display: flex; flex-direction: column; }
.chat-message.me { align-self: flex-end; align-items: flex-end; }
.message-bubble {
    padding: 10px 14px; border-radius: 18px; font-size: 0.95rem; line-height: 1.4;
    background: var(--mcq-surface); border: 1px solid var(--mcq-border);
    border-bottom-left-radius: 4px;
}
.chat-message.me .message-bubble {
    background: var(--mcq-primary); color: white; border: none;
    border-radius: 18px; border-bottom-right-radius: 4px;
}
.message-time { font-size: 0.7rem; color: var(--mcq-text-muted); margin-top: 4px; }
.chat-input-area {
    padding: 12px; border-top: 1px solid var(--mcq-border); background: var(--mcq-surface);
    display: flex; gap: 8px;
}
.chat-input-area input {
    flex: 1; padding: 10px 16px; border: 1px solid var(--mcq-border);
    border-radius: 20px; background: var(--mcq-bg); color: var(--mcq-text-main);
}

/* =========================================
   10. MOBILE NAV & MODALS
   ========================================= */
.mobile-nav {
    display: none; position: fixed; bottom: 0; left: 0; right: 0;
    background: rgba(255, 255, 255, 0.95); backdrop-filter: blur(10px);
    border-top: 1px solid var(--mcq-border); padding: 10px 0; z-index: 999;
    padding-bottom: env(safe-area-inset-bottom);
    justify-content: space-around;
}
.nav-item {
    display: flex; flex-direction: column; align-items: center; gap: 4px;
    color: var(--mcq-text-muted); font-size: 0.7rem; font-weight: 500;
}
.nav-item.active { color: var(--mcq-primary); }
.nav-item .dashicons { font-size: 20px; height: 20px; }

[data-theme="dark"] .mobile-nav { background: rgba(30, 41, 59, 0.95); }

@media (max-width: 1024px) {
    .sidebar { display: none; }
    .mobile-nav { display: flex; }
    .main-content { padding: 20px; padding-bottom: 90px; }
}

/* Modal Core */
.modal-backdrop {
    position: fixed; inset: 0; background: rgba(0, 0, 0, 0.6);
    display: none; align-items: center; justify-content: center; z-index: 3000;
    backdrop-filter: blur(4px);
}
.modal-content {
    background: var(--mcq-surface); border-radius: var(--mcq-radius);
    width: 500px; max-width: 90%; max-height: 90vh; overflow-y: auto;
    position: relative; box-shadow: var(--mcq-shadow-lg); animation: slideUp 0.2s ease;
}
.modal-title {
    padding: 20px 24px; border-bottom: 1px solid var(--mcq-border);
    font-size: 1.2rem; font-weight: 700; color: var(--mcq-text-main);
    display: flex; align-items: center; gap: 10px; margin: 0;
}
.modal-body { padding: 24px; }
.modal-actions {
    padding: 16px 24px; border-top: 1px solid var(--mcq-border);
    display: flex; justify-content: flex-end; gap: 12px; background: var(--mcq-bg);
}
.modal-close {
    position: absolute; top: 20px; right: 24px; font-size: 24px; cursor: pointer; color: var(--mcq-text-muted);
}

@keyframes slideUp { from { transform: translateY(20px); opacity: 0; } to { transform: translateY(0); opacity: 1; } }