/* ============================================
   Memory Lane - Batch 2022
   Modern, warm, nostalgic design
   ============================================ */

:root {
    --primary: #6C63FF;
    --primary-dark: #5548d9;
    --secondary: #FF6B9D;
    --accent: #FFD166;
    --bg: #0F0F1A;
    --bg-card: #1A1A2E;
    --bg-elevated: #232340;
    --text: #F0F0F5;
    --text-muted: #A0A0B8;
    --border: rgba(255,255,255,0.08);
    --success: #4ADE80;
    --error: #F87171;
    --radius: 16px;
    --radius-sm: 10px;
    --shadow: 0 10px 40px rgba(0,0,0,0.4);
    --gradient: linear-gradient(135deg, #6C63FF 0%, #FF6B9D 50%, #FFD166 100%);
    --gradient-soft: linear-gradient(135deg, rgba(108,99,255,0.15), rgba(255,107,157,0.1));
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Segoe UI', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

/* Background effects */
body::before {
    content: '';
    position: fixed;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: 
        radial-gradient(circle at 20% 30%, rgba(108,99,255,0.12) 0%, transparent 40%),
        radial-gradient(circle at 80% 70%, rgba(255,107,157,0.1) 0%, transparent 40%),
        radial-gradient(circle at 50% 50%, rgba(255,209,102,0.05) 0%, transparent 50%);
    z-index: -1;
    animation: bgFloat 20s ease-in-out infinite alternate;
}

@keyframes bgFloat {
    0% { transform: translate(0, 0) rotate(0deg); }
    100% { transform: translate(-3%, 2%) rotate(2deg); }
}

a {
    color: var(--primary);
    text-decoration: none;
    transition: color 0.2s;
}
a:hover {
    color: var(--secondary);
}

/* ========== LAYOUT ========== */
.container {
    width: 100%;
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ========== NAV ========== */
.navbar {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(15,15,26,0.85);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border);
    padding: 14px 0;
}

.nav-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--text);
}

.logo-icon {
    width: 36px;
    height: 36px;
    background: var(--gradient);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 12px;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 20px;
    border-radius: 999px;
    font-weight: 600;
    font-size: 0.95rem;
    border: none;
    cursor: pointer;
    transition: all 0.25s ease;
    text-decoration: none;
}

.btn-primary {
    background: var(--gradient);
    color: #fff;
    box-shadow: 0 4px 20px rgba(108,99,255,0.35);
}
.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 28px rgba(108,99,255,0.45);
    color: #fff;
}

.btn-outline {
    background: transparent;
    color: var(--text);
    border: 1.5px solid var(--border);
}
.btn-outline:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: rgba(108,99,255,0.08);
}

.btn-ghost {
    background: transparent;
    color: var(--text-muted);
}
.btn-ghost:hover {
    color: var(--text);
}

.btn-sm {
    padding: 7px 14px;
    font-size: 0.85rem;
}

.btn-block {
    width: 100%;
}

/* ========== HERO ========== */
.hero {
    padding: 80px 0 60px;
    text-align: center;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--gradient-soft);
    border: 1px solid var(--border);
    padding: 6px 16px;
    border-radius: 999px;
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 24px;
}

.hero h1 {
    font-size: clamp(2.2rem, 5vw, 3.4rem);
    font-weight: 800;
    line-height: 1.15;
    margin-bottom: 18px;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero p {
    font-size: 1.15rem;
    color: var(--text-muted);
    max-width: 560px;
    margin: 0 auto 32px;
}

.hero-actions {
    display: flex;
    gap: 14px;
    justify-content: center;
    flex-wrap: wrap;
}

/* ========== FEATURES ========== */
.features {
    padding: 40px 0 80px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 24px;
}

.feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 28px;
    transition: transform 0.25s, border-color 0.25s;
}
.feature-card:hover {
    transform: translateY(-4px);
    border-color: rgba(108,99,255,0.3);
}

.feature-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    background: var(--gradient-soft);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    margin-bottom: 16px;
}

.feature-card h3 {
    font-size: 1.15rem;
    margin-bottom: 8px;
}

.feature-card p {
    color: var(--text-muted);
    font-size: 0.95rem;
}

/* ========== CARDS / FORMS ========== */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 32px;
    box-shadow: var(--shadow);
}

.card-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.card-subtitle {
    color: var(--text-muted);
    margin-bottom: 28px;
    font-size: 0.95rem;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-muted);
}

.form-control {
    width: 100%;
    padding: 12px 16px;
    background: var(--bg-elevated);
    border: 1.5px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text);
    font-size: 1rem;
    transition: border-color 0.2s, box-shadow 0.2s;
    outline: none;
}

.form-control:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(108,99,255,0.2);
}

.form-control::placeholder {
    color: var(--text-muted);
    opacity: 0.7;
}

select.form-control {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%23A0A0B8' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10l-5 5z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 14px center;
    padding-right: 36px;
}

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

/* Alert messages */
.alert {
    padding: 14px 18px;
    border-radius: var(--radius-sm);
    margin-bottom: 20px;
    font-size: 0.95rem;
}
.alert-success {
    background: rgba(74,222,128,0.12);
    border: 1px solid rgba(74,222,128,0.3);
    color: var(--success);
}
.alert-error {
    background: rgba(248,113,113,0.12);
    border: 1px solid rgba(248,113,113,0.3);
    color: var(--error);
}
.alert-info {
    background: rgba(108,99,255,0.12);
    border: 1px solid rgba(108,99,255,0.3);
    color: #a5a0ff;
}

/* ========== AUTH PAGES ========== */
.auth-page {
    min-height: calc(100vh - 70px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px 20px;
}

.auth-card {
    width: 100%;
    max-width: 420px;
}

/* ========== DASHBOARD ========== */
.dashboard {
    padding: 40px 0 80px;
}

.dashboard-header {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    margin-bottom: 32px;
}

.welcome-text h1 {
    font-size: 1.75rem;
    font-weight: 700;
}
.welcome-text p {
    color: var(--text-muted);
    font-size: 0.95rem;
}

.stats-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 16px;
    margin-bottom: 32px;
}

.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 18px;
    text-align: center;
}
.stat-card .num {
    font-size: 1.8rem;
    font-weight: 800;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.stat-card .label {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 4px;
}

.stat-card-dept.stat-card-active {
    border-color: rgba(108, 99, 255, 0.45);
    box-shadow: 0 0 20px rgba(108, 99, 255, 0.15);
}

.stat-card-dept .num {
    transition: transform 0.3s ease;
}

.stat-card-dept.stat-card-active .num {
    transform: scale(1.08);
}

.grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 28px;
}

@media (max-width: 768px) {
    .grid-2 {
        grid-template-columns: 1fr;
    }
}

/* Message cards */
.message-list {
    display: flex;
    flex-direction: column;
    gap: 14px;
    max-height: 480px;
    overflow-y: auto;
    padding-right: 6px;
}

.message-card {
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 16px 18px;
    transition: border-color 0.2s;
}
.message-card:hover {
    border-color: rgba(108,99,255,0.25);
}

.message-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
    font-size: 0.8rem;
    color: var(--text-muted);
}

.message-from {
    font-weight: 600;
    color: var(--primary);
}

.message-text {
    font-size: 0.98rem;
    line-height: 1.5;
}

.empty-state {
    text-align: center;
    padding: 40px 20px;
    color: var(--text-muted);
}
.empty-state .icon {
    font-size: 2.5rem;
    margin-bottom: 12px;
    opacity: 0.6;
}

/* Searchable select helper */
.select-wrapper {
    position: relative;
}

.student-search {
    margin-bottom: 8px;
}

/* Footer */
.footer {
    border-top: 1px solid var(--border);
    padding: 28px 0;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* Character counter */
.char-count {
    text-align: right;
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 6px;
}

/* Tabs */
.tabs {
    display: flex;
    gap: 8px;
    margin-bottom: 24px;
    border-bottom: 1px solid var(--border);
    padding-bottom: 0;
}
.tab-btn {
    padding: 10px 18px;
    background: none;
    border: none;
    color: var(--text-muted);
    font-weight: 600;
    cursor: pointer;
    border-bottom: 2px solid transparent;
    margin-bottom: -1px;
    transition: all 0.2s;
}
.tab-btn.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
}
.tab-btn:hover {
    color: var(--text);
}

.tab-content {
    display: none;
}
.tab-content.active {
    display: block;
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 6px;
}
::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background: rgba(255,255,255,0.15);
    border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
    background: rgba(255,255,255,0.25);
}

/* Utility */
.text-center { text-align: center; }
.mt-2 { margin-top: 12px; }
.mb-2 { margin-bottom: 12px; }
.hidden { display: none !important; }

/* ========== ANIMATIONS ========== */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(16px); }
    to { opacity: 1; transform: translateY(0); }
}
@keyframes panelIn {
    from { opacity: 0; transform: translateY(-8px) scale(0.98); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}
@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-6px); }
    75% { transform: translateX(6px); }
}
@keyframes spin {
    to { transform: rotate(360deg); }
}

.animate-in {
    animation: fadeInUp 0.5s ease both;
}
.animate-shake {
    animation: shake 0.4s ease;
}

/* ========== AUTH ENHANCEMENTS ========== */
.auth-icon {
    width: 56px;
    height: 56px;
    border-radius: 16px;
    background: var(--gradient-soft);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.6rem;
    margin-bottom: 16px;
}
.auth-hint {
    font-size: 0.85rem;
    color: var(--text-muted);
}
.input-icon-wrap {
    position: relative;
}
.input-icon-wrap .input-icon {
    position: absolute;
    left: 14px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 0.9rem;
    opacity: 0.6;
    pointer-events: none;
}
.input-icon-wrap .form-control {
    padding-left: 40px;
}
.toggle-password {
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1rem;
    opacity: 0.6;
    transition: opacity 0.2s;
}
.toggle-password:hover { opacity: 1; }

.btn-loader {
    width: 18px;
    height: 18px;
    border: 2px solid rgba(255,255,255,0.3);
    border-top-color: #fff;
    border-radius: 50%;
    animation: spin 0.7s linear infinite;
    display: inline-block;
}

/* ========== USER CHIP ========== */
.user-chip {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.9rem;
    color: var(--text-muted);
}
.user-avatar, .mini-avatar {
    width: 32px;
    height: 32px;
    border-radius: 10px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 0.7rem;
    font-weight: 800;
    color: #fff;
    flex-shrink: 0;
}
.mini-avatar {
    width: 26px;
    height: 26px;
    font-size: 0.65rem;
    margin-right: 6px;
}
.message-from {
    display: inline-flex;
    align-items: center;
}

/* ========== DEPARTMENT DROPDOWN ========== */
.dept-dropdown {
    position: relative;
}
.dept-trigger {
    width: 100%;
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 18px;
    background: var(--bg-elevated);
    border: 1.5px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text);
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.25s ease;
    text-align: left;
}
.dept-trigger:hover,
.dept-trigger.open {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(108,99,255,0.15);
}
.dept-trigger-icon {
    font-size: 1.3rem;
}
.dept-trigger-text {
    flex: 1;
    font-weight: 600;
}
.dept-trigger-arrow {
    color: var(--text-muted);
    transition: transform 0.25s;
}
.dept-trigger.open .dept-trigger-arrow {
    transform: rotate(180deg);
}
.dept-panel {
    position: absolute;
    top: calc(100% + 8px);
    left: 0;
    right: 0;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow);
    z-index: 60;
    overflow: hidden;
    animation: panelIn 0.25s ease;
}
.dept-option {
    width: 100%;
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 14px 18px;
    background: none;
    border: none;
    color: var(--text);
    cursor: pointer;
    transition: background 0.2s;
    text-align: left;
}
.dept-option:hover {
    background: rgba(108,99,255,0.12);
}
.dept-option-icon {
    font-size: 1.4rem;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-soft);
    border-radius: 10px;
}
.dept-option-text strong {
    display: block;
    font-size: 0.95rem;
}
.dept-option-text small {
    color: var(--text-muted);
    font-size: 0.78rem;
}

/* ========== SEARCHABLE DROPDOWN ========== */
.searchable-dropdown {
    position: relative;
}
.sd-trigger {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 16px;
    background: var(--bg-elevated);
    border: 1.5px solid var(--border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.25s;
    min-height: 50px;
}
.sd-trigger:hover,
.sd-trigger.open {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(108,99,255,0.15);
}
.sd-placeholder {
    color: var(--text-muted);
}
.sd-arrow {
    color: var(--text-muted);
    transition: transform 0.25s;
}
.sd-trigger.open .sd-arrow {
    transform: rotate(180deg);
}
.sd-panel {
    position: absolute;
    top: calc(100% + 6px);
    left: 0;
    right: 0;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow);
    z-index: 60;
    overflow: hidden;
    animation: panelIn 0.25s ease;
}
.sd-search-wrap {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 14px;
    border-bottom: 1px solid var(--border);
}
.sd-search {
    flex: 1;
    background: none;
    border: none;
    color: var(--text);
    font-size: 0.95rem;
    outline: none;
}
.sd-list {
    max-height: 260px;
    overflow-y: auto;
}
.sd-item {
    width: 100%;
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    background: none;
    border: none;
    color: var(--text);
    cursor: pointer;
    transition: background 0.15s;
    text-align: left;
}
.sd-item:hover {
    background: rgba(108,99,255,0.1);
}
.sd-item.selected {
    background: rgba(108,99,255,0.18);
}
.sd-avatar {
    width: 38px;
    height: 38px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 0.8rem;
    color: #fff;
    flex-shrink: 0;
}
.sd-info {
    flex: 1;
    min-width: 0;
}
.sd-info strong {
    display: block;
    font-size: 0.92rem;
}
.sd-info small {
    color: var(--text-muted);
    font-size: 0.78rem;
}
.sd-check {
    color: var(--success);
    font-weight: 800;
    opacity: 0;
    transition: opacity 0.2s;
}
.sd-item.selected .sd-check {
    opacity: 1;
}
.sd-selected {
    display: flex;
    align-items: center;
    gap: 10px;
}
.sd-selected small {
    display: block;
    color: var(--text-muted);
    font-size: 0.78rem;
}
.sd-empty, .sd-loading {
    padding: 24px;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.9rem;
}
.spinner {
    width: 24px;
    height: 24px;
    border: 2px solid var(--border);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.7s linear infinite;
    margin: 0 auto 10px;
}

.export-actions {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}
.card-title-sm {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 6px;
}