/* dinglab.pl — Design System */

/* ===== Design Tokens (Dark Mode Default) ===== */
:root {
    --dl-bg-primary: #0F172A;
    --dl-bg-secondary: #1E293B;
    --dl-bg-card: #1E293B;
    --dl-bg-elevated: #334155;
    --dl-bg-input: #1E293B;
    --dl-text-primary: #F1F5F9;
    --dl-text-secondary: #94A3B8;
    --dl-text-muted: #64748B;
    --dl-accent-primary: #10B981;
    --dl-accent-primary-hover: #059669;
    --dl-accent-success: #10B981;
    --dl-accent-warning: #F59E0B;
    --dl-accent-danger: #EF4444;
    --dl-accent-info: #6366F1;
    --dl-accent-cyan: #06B6D4;
    --dl-border-color: #334155;
    --dl-shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
    --dl-shadow-md: 0 4px 12px rgba(0,0,0,0.3);
    --dl-shadow-lg: 0 8px 24px rgba(0,0,0,0.4);
    --dl-shadow-glow: 0 0 20px rgba(16,185,129,0.15);
    --dl-font-display: 'Nunito', sans-serif;
    --dl-font-body: 'Inter', sans-serif;
    --dl-radius-sm: 8px;
    --dl-radius-md: 12px;
    --dl-radius-lg: 16px;
    --dl-transition-fast: 150ms ease;
    --dl-transition-normal: 250ms ease;
    /* Legacy compat */
    --dinglab-green: #10B981;
    --dinglab-green-dark: #059669;
    --dinglab-green-light: #34D399;
    --dinglab-yellow: #F59E0B;
    --dinglab-yellow-light: #FCD34D;
    --dinglab-bg-light: var(--dl-bg-elevated);
    --dinglab-text-dark: var(--dl-text-primary);
}

[data-theme="light"] {
    --dl-bg-primary: #F8FAFC;
    --dl-bg-secondary: #FFFFFF;
    --dl-bg-card: #FFFFFF;
    --dl-bg-elevated: #F1F5F9;
    --dl-bg-input: #F1F5F9;
    --dl-text-primary: #1E293B;
    --dl-text-secondary: #475569;
    --dl-text-muted: #94A3B8;
    --dl-border-color: #E2E8F0;
    --dl-shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
    --dl-shadow-md: 0 4px 12px rgba(0,0,0,0.08);
    --dl-shadow-lg: 0 8px 24px rgba(0,0,0,0.12);
    --dl-shadow-glow: 0 0 20px rgba(16,185,129,0.08);
    --dinglab-bg-light: #F1F5F9;
    --dinglab-text-dark: #1E293B;
}

/* ===== Base Styles ===== */
*, *::before, *::after {
    transition: background-color var(--dl-transition-normal),
                color var(--dl-transition-normal),
                border-color var(--dl-transition-normal),
                box-shadow var(--dl-transition-normal);
}

body {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    background-color: var(--dl-bg-primary);
    color: var(--dl-text-primary);
    font-family: var(--dl-font-body);
}

main {
    flex: 1;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--dl-font-display);
    font-weight: 700;
    color: var(--dl-text-primary);
}

a {
    color: var(--dl-accent-primary);
    transition: color var(--dl-transition-fast);
}

a:hover {
    color: var(--dl-accent-primary-hover);
}

::selection {
    background: rgba(16, 185, 129, 0.3);
    color: var(--dl-text-primary);
}

/* Custom scrollbar */
::-webkit-scrollbar {
    width: 8px;
}
::-webkit-scrollbar-track {
    background: var(--dl-bg-primary);
}
::-webkit-scrollbar-thumb {
    background: var(--dl-bg-elevated);
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--dl-text-muted);
}

/* ===== Global Button Press Effect ===== */
.btn {
    transition: transform 0.1s ease, box-shadow var(--dl-transition-fast),
                background-color var(--dl-transition-fast), color var(--dl-transition-fast),
                border-color var(--dl-transition-fast);
}
.btn:active:not(:disabled) {
    transform: scale(0.97);
}

/* ===== Bootstrap Component Overrides ===== */

/* Buttons */
.btn-primary {
    background: linear-gradient(135deg, #10B981, #059669);
    border-color: transparent;
    color: #fff;
    font-weight: 600;
    border-radius: var(--dl-radius-sm);
}
.btn-primary:hover, .btn-primary:active, .btn-primary:focus {
    background: linear-gradient(135deg, #059669, #047857);
    border-color: transparent;
    color: #fff;
    box-shadow: 0 0 20px rgba(16, 185, 129, 0.3), 0 4px 12px rgba(16, 185, 129, 0.2);
}
.btn-outline-primary {
    color: var(--dl-accent-primary);
    border-color: var(--dl-accent-primary);
    border-radius: var(--dl-radius-sm);
}
.btn-outline-primary:hover, .btn-outline-primary:active, .btn-outline-primary:focus {
    background-color: var(--dl-accent-primary);
    border-color: var(--dl-accent-primary);
    color: #fff;
}
.btn-success {
    background: linear-gradient(135deg, #10B981, #059669);
    border-color: transparent;
}
.btn-success:hover {
    background: linear-gradient(135deg, #059669, #047857);
    border-color: transparent;
}
.btn-outline-secondary {
    color: var(--dl-text-secondary);
    border-color: var(--dl-border-color);
    border-radius: var(--dl-radius-sm);
}
.btn-outline-secondary:hover {
    background-color: var(--dl-bg-elevated);
    border-color: var(--dl-border-color);
    color: var(--dl-text-primary);
}
.btn-outline-success {
    color: var(--dl-accent-success);
    border-color: var(--dl-accent-success);
}
.btn-outline-success:hover {
    background-color: var(--dl-accent-success);
    color: #fff;
}
.btn-outline-warning {
    color: var(--dl-accent-warning);
    border-color: var(--dl-accent-warning);
}
.btn-outline-warning:hover {
    background-color: var(--dl-accent-warning);
    color: #000;
}
.btn-outline-danger {
    color: var(--dl-accent-danger);
    border-color: var(--dl-accent-danger);
}
.btn-outline-danger:hover {
    background-color: var(--dl-accent-danger);
    color: #fff;
}
.btn-outline-info {
    color: var(--dl-accent-cyan);
    border-color: var(--dl-accent-cyan);
}
.btn-outline-info:hover {
    background-color: var(--dl-accent-cyan);
    color: #fff;
}
.btn-warning {
    background: linear-gradient(135deg, #F59E0B, #D97706);
    border-color: transparent;
    color: #000;
}
.btn-warning:hover {
    background: linear-gradient(135deg, #D97706, #B45309);
    border-color: transparent;
}
.btn-danger {
    background: linear-gradient(135deg, #EF4444, #DC2626);
    border-color: transparent;
}
.btn-danger:hover {
    background: linear-gradient(135deg, #DC2626, #B91C1C);
    border-color: transparent;
}
.btn-light {
    background-color: var(--dl-bg-elevated);
    border-color: var(--dl-border-color);
    color: var(--dl-text-primary);
}
.btn-light:hover {
    background-color: var(--dl-bg-card);
    color: var(--dl-text-primary);
}

/* Cards */
.card {
    background-color: var(--dl-bg-card);
    border: 1px solid var(--dl-border-color);
    border-radius: var(--dl-radius-md);
    box-shadow: var(--dl-shadow-sm);
    color: var(--dl-text-primary);
}
.card-header {
    background-color: var(--dl-bg-elevated);
    border-bottom: 1px solid var(--dl-border-color);
    color: var(--dl-text-primary);
    font-family: var(--dl-font-display);
    font-weight: 600;
}
.card-footer {
    background-color: var(--dl-bg-elevated);
    border-top: 1px solid var(--dl-border-color);
    color: var(--dl-text-secondary);
}

/* Badge */
.badge {
    font-weight: 600;
    border-radius: var(--dl-radius-sm);
}
.bg-primary { background-color: var(--dl-accent-primary) !important; }
.bg-success { background-color: var(--dl-accent-success) !important; }
.bg-warning { background-color: var(--dl-accent-warning) !important; }
.bg-danger { background-color: var(--dl-accent-danger) !important; }
.bg-info { background-color: var(--dl-accent-info) !important; }
.bg-secondary { background-color: var(--dl-bg-elevated) !important; color: var(--dl-text-secondary) !important; }
.bg-light { background-color: var(--dl-bg-elevated) !important; color: var(--dl-text-primary) !important; }

/* Text colors */
.text-primary { color: var(--dl-accent-primary) !important; }
.text-success { color: var(--dl-accent-success) !important; }
.text-warning { color: var(--dl-accent-warning) !important; }
.text-danger { color: var(--dl-accent-danger) !important; }
.text-info { color: var(--dl-accent-info) !important; }
.text-muted { color: var(--dl-text-muted) !important; }
.text-dark { color: var(--dl-text-primary) !important; }
.text-secondary { color: var(--dl-text-secondary) !important; }
.text-white-50 { color: rgba(241, 245, 249, 0.5) !important; }

/* Forms */
.form-control, .form-select {
    background-color: var(--dl-bg-input);
    border: 1px solid var(--dl-border-color);
    color: var(--dl-text-primary);
    border-radius: var(--dl-radius-sm);
}
.form-control:focus, .form-select:focus {
    background-color: var(--dl-bg-input);
    border-color: var(--dl-accent-primary);
    color: var(--dl-text-primary);
    box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.2), 0 0 12px rgba(16, 185, 129, 0.1);
}

/* ===== Enhanced Focus States ===== */
.btn:focus-visible {
    outline: none;
    box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.4);
}
.btn-warning:focus-visible {
    box-shadow: 0 0 0 3px rgba(245, 158, 11, 0.4);
}
.btn-danger:focus-visible, .btn-outline-danger:focus-visible {
    box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.4);
}
.btn-outline-info:focus-visible {
    box-shadow: 0 0 0 3px rgba(6, 182, 212, 0.4);
}
.dl-pill-chip:focus-visible, .dl-period-pill:focus-visible {
    outline: none;
    box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.4);
}
a:focus-visible {
    outline: 2px solid var(--dl-accent-primary);
    outline-offset: 2px;
    border-radius: 2px;
}
.form-control::placeholder {
    color: var(--dl-text-muted);
}
.form-label {
    color: var(--dl-text-secondary);
    font-weight: 500;
}
.form-text {
    color: var(--dl-text-muted);
}

/* Tables */
.table {
    color: var(--dl-text-primary);
    --bs-table-bg: transparent;
    --bs-table-striped-bg: var(--dl-bg-elevated);
    --bs-table-hover-bg: var(--dl-bg-elevated);
    border-color: var(--dl-border-color);
}
.table > :not(caption) > * > * {
    background-color: transparent;
    border-bottom-color: var(--dl-border-color);
    color: var(--dl-text-primary);
}
.table-striped > tbody > tr:nth-of-type(odd) > * {
    background-color: var(--dl-bg-elevated);
    color: var(--dl-text-primary);
}
.table-primary {
    --bs-table-bg: rgba(16, 185, 129, 0.1) !important;
    color: var(--dl-text-primary) !important;
}
.table-primary > * {
    color: var(--dl-text-primary) !important;
    background-color: rgba(16, 185, 129, 0.1) !important;
}
.table th {
    font-weight: 600;
    color: var(--dl-text-secondary);
}

/* Progress */
.progress {
    background-color: var(--dl-bg-elevated);
    border-radius: var(--dl-radius-sm);
    overflow: hidden;
}
.progress-bar {
    transition: width 0.8s cubic-bezier(0.4, 0, 0.2, 1);
    border-radius: var(--dl-radius-sm);
}
.progress-bar.bg-success {
    background: linear-gradient(90deg, #10B981, #34D399) !important;
}
.progress-bar.bg-warning {
    background: linear-gradient(90deg, #F59E0B, #FCD34D) !important;
}
.progress-bar.bg-danger {
    background: linear-gradient(90deg, #EF4444, #F87171) !important;
}
.progress-bar:not(.bg-success):not(.bg-warning):not(.bg-danger) {
    background: linear-gradient(90deg, #10B981, #34D399);
}

/* Alert */
.alert {
    border-radius: var(--dl-radius-md);
    border: 1px solid var(--dl-border-color);
    animation: slideIn 0.3s ease;
}
.alert-success {
    background-color: rgba(16, 185, 129, 0.15);
    border-color: rgba(16, 185, 129, 0.3);
    color: var(--dl-accent-success);
}
.alert-danger {
    background-color: rgba(239, 68, 68, 0.15);
    border-color: rgba(239, 68, 68, 0.3);
    color: var(--dl-accent-danger);
}
.alert-warning {
    background-color: rgba(245, 158, 11, 0.15);
    border-color: rgba(245, 158, 11, 0.3);
    color: var(--dl-accent-warning);
}
.alert-info {
    background-color: rgba(99, 102, 241, 0.15);
    border-color: rgba(99, 102, 241, 0.3);
    color: var(--dl-accent-info);
}
@keyframes slideIn {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Dropdown */
.dropdown-menu {
    background-color: var(--dl-bg-card);
    border: 1px solid var(--dl-border-color);
    border-radius: var(--dl-radius-md);
    box-shadow: var(--dl-shadow-lg);
    animation: dropdownReveal 0.2s ease;
}
@keyframes dropdownReveal {
    from { opacity: 0; }
    to { opacity: 1; }
}
.dropdown-item {
    color: var(--dl-text-primary);
    transition: background-color var(--dl-transition-fast), color var(--dl-transition-fast), padding-left var(--dl-transition-fast);
}
.dropdown-item:hover, .dropdown-item:focus {
    background-color: var(--dl-bg-elevated);
    color: var(--dl-accent-primary);
    padding-left: 1.25rem;
}

/* Tabs & Pills */
.nav-tabs {
    border-bottom-color: var(--dl-border-color);
}
.nav-tabs .nav-link {
    color: var(--dl-text-secondary);
    border-radius: var(--dl-radius-sm) var(--dl-radius-sm) 0 0;
}
.nav-tabs .nav-link:hover {
    border-color: var(--dl-border-color);
    color: var(--dl-accent-primary);
}
.nav-tabs .nav-link.active {
    background-color: var(--dl-bg-card);
    border-color: var(--dl-border-color) var(--dl-border-color) var(--dl-bg-card);
    color: var(--dl-accent-primary);
}
.nav-pills .nav-link {
    color: var(--dl-text-secondary);
    border-radius: var(--dl-radius-sm);
}
.nav-pills .nav-link:hover {
    background-color: var(--dl-bg-elevated);
    color: var(--dl-text-primary);
}
.nav-pills .nav-link.active {
    background-color: var(--dl-accent-primary);
    color: #fff;
}

/* List Group */
.list-group-item {
    background-color: var(--dl-bg-card);
    border-color: var(--dl-border-color);
    color: var(--dl-text-primary);
    transition: background-color var(--dl-transition-fast);
}
.list-group-item:hover {
    background-color: var(--dl-bg-elevated);
}
.list-group-item-action:hover {
    background-color: var(--dl-bg-elevated);
    color: var(--dl-text-primary);
}
.list-group-item-success {
    background-color: rgba(16, 185, 129, 0.1) !important;
    color: var(--dl-accent-success) !important;
}
.list-group-item-danger {
    background-color: rgba(239, 68, 68, 0.1) !important;
    color: var(--dl-accent-danger) !important;
}

/* Modal */
.modal-content {
    background-color: var(--dl-bg-card);
    border: 1px solid var(--dl-border-color);
    border-radius: var(--dl-radius-lg);
}
.modal-header {
    border-bottom-color: var(--dl-border-color);
}
.modal-footer {
    border-top-color: var(--dl-border-color);
}

/* Jumbotron / hero bg-light */
.jumbotron, .bg-light.p-5 {
    background-color: var(--dl-bg-secondary) !important;
}

/* ===== Brand Bar ===== */
.dinglab-brand-bar {
    background-color: var(--dl-bg-secondary);
    border-bottom: 2px solid var(--dl-accent-primary);
}
.dinglab-logo {
    height: 65px;
    width: auto;
}
.dinglab-name {
    height: 35px;
    width: auto;
}
[data-theme="light"] .dinglab-name {
    filter: none;
}
[data-theme="dark"] .dinglab-name {
    filter: brightness(1.8) saturate(0.8);
}
.dinglab-slogan {
    color: var(--dl-text-secondary);
    font-style: italic;
    font-size: 0.95rem;
    font-weight: 500;
    letter-spacing: 0.5px;
}

/* Theme toggle */
.dl-theme-toggle {
    background: none;
    border: 1px solid var(--dl-border-color);
    border-radius: var(--dl-radius-sm);
    color: var(--dl-text-secondary);
    padding: 0.25rem 0.5rem;
    cursor: pointer;
    font-size: 1.1rem;
    line-height: 1;
    transition: all var(--dl-transition-fast);
}
.dl-theme-toggle:hover {
    color: var(--dl-accent-warning);
    border-color: var(--dl-accent-warning);
}

/* ===== Navigation Bar ===== */
.dinglab-nav {
    background-color: var(--dl-bg-secondary);
    padding: 0;
    box-shadow: var(--dl-shadow-sm);
    border-bottom: 1px solid var(--dl-border-color);
}
#subjectSelector, #subjectSelectorMobile { font-weight: 500; }
.dinglab-nav .nav-link {
    color: var(--dl-text-secondary);
    padding: 0.75rem 1rem;
    font-weight: 500;
    transition: all 0.2s ease;
    border-bottom: 3px solid transparent;
}
.dinglab-nav .nav-link:hover,
.dinglab-nav .nav-link:focus {
    color: var(--dl-accent-primary);
    background-color: var(--dl-bg-elevated);
    border-bottom-color: var(--dl-accent-primary);
}
.dinglab-nav .nav-link.active {
    color: var(--dl-accent-primary);
    border-bottom-color: var(--dl-accent-primary);
}
.dinglab-subject-link { position: relative; }
.dinglab-subject-link::before {
    content: '';
    display: inline-block;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: var(--subject-color);
    margin-right: 4px;
    vertical-align: middle;
}
.dinglab-nav .dropdown-menu {
    border: 1px solid var(--dl-border-color);
    box-shadow: var(--dl-shadow-lg);
    border-radius: var(--dl-radius-md);
    border-top: 3px solid var(--dl-accent-primary);
    background-color: var(--dl-bg-card);
}
.dinglab-nav .dropdown-item:hover {
    background-color: var(--dl-bg-elevated);
    color: var(--dl-accent-primary);
}
.dinglab-nav .navbar-toggler {
    border-color: var(--dl-accent-primary);
}
.dinglab-nav .navbar-toggler-icon {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='%2310B981' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}
.navbar-collapse {
    background-color: var(--dl-bg-secondary);
}

/* ===== Footer ===== */
.dinglab-footer {
    background: linear-gradient(135deg, #059669, #10B981);
    border-top: 3px solid var(--dl-accent-warning);
    padding: 1rem 0;
    margin-top: auto;
}

/* ===== Category Cards ===== */
.category-card {
    transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
}
.category-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--dl-shadow-lg);
    border-color: rgba(16, 185, 129, 0.3);
}
.category-icon {
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* ===== Quiz Styling ===== */

/* Answer buttons */
.btn-outline-primary:hover,
.btn-outline-success:hover,
.btn-outline-danger:hover {
    transform: scale(1.02);
}

/* Results page */
.display-1 {
    animation: bounce 0.5s ease;
}
@keyframes bounce {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}

/* Card shadows */
.card.shadow, .card.shadow-sm {
    box-shadow: var(--dl-shadow-sm);
}
.card.shadow:hover, .card.shadow-sm:hover {
    box-shadow: var(--dl-shadow-md);
}

/* Streak badge animation */
.badge.bg-warning {
    animation: pulse 1.5s infinite;
}
@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.7; }
}

/* ===== Streak Tiers ===== */
.streak-warm {
    box-shadow: 0 0 8px rgba(245, 158, 11, 0.5);
}
.streak-hot {
    animation: pulse 0.8s infinite !important;
    box-shadow: 0 0 12px rgba(245, 158, 11, 0.6);
}
.streak-legendary {
    animation: pulse 0.5s infinite !important;
    box-shadow: 0 0 20px rgba(245, 158, 11, 0.8), 0 0 40px rgba(239, 68, 68, 0.4);
    border: 1px solid var(--dl-accent-warning);
}

/* ===== Step Indicator Dots (legacy) ===== */
.step-dots {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
    justify-content: center;
}
.step-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    display: inline-block;
    background-color: var(--dl-bg-elevated);
    transition: background-color 0.3s;
}
.step-dots-small .step-dot {
    width: 8px;
    height: 8px;
}
.step-correct { background-color: var(--dl-accent-success); }
.step-wrong { background-color: var(--dl-accent-danger); }
.step-current {
    background-color: var(--dl-accent-warning);
    animation: dotPulse 1s infinite;
}
.step-future { background-color: var(--dl-bg-elevated); }
@keyframes dotPulse {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.3); opacity: 0.7; }
}

/* ===== Segmented Quiz Progress Bar ===== */
.dl-quiz-segments {
    display: flex;
    gap: 2px;
    height: 8px;
    border-radius: 4px;
    overflow: hidden;
}
.dl-quiz-segment {
    flex: 1;
    border-radius: 2px;
    transition: background-color 0.3s ease, transform 0.2s ease;
}
.dl-quiz-segment.seg-correct {
    background: linear-gradient(135deg, #10B981, #34D399);
}
.dl-quiz-segment.seg-wrong {
    background: linear-gradient(135deg, #EF4444, #F87171);
}
.dl-quiz-segment.seg-current {
    background: linear-gradient(135deg, #F59E0B, #FCD34D);
    animation: segPulse 1.5s ease-in-out infinite;
}
.dl-quiz-segment.seg-future {
    background: var(--dl-bg-elevated);
}
@keyframes segPulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.6; }
}

/* ===== Circular Timer Ring ===== */
.dl-timer-ring {
    position: relative;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
}
.dl-timer-ring svg {
    position: absolute;
    top: 0;
    left: 0;
}
.dl-timer-ring #timerCircle {
    transition: stroke-dashoffset 0.5s linear, stroke 0.3s ease;
}
.dl-timer-text {
    font-family: var(--dl-font-display);
    font-weight: 800;
    font-size: 0.9rem;
    color: var(--dl-text-primary);
    z-index: 1;
}
.dl-timer-urgent {
    animation: timerPulse 0.8s ease-in-out infinite;
}
.dl-timer-expired .dl-timer-text {
    color: var(--dl-text-muted);
}
@keyframes timerPulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.08); }
}

/* ===== Streak Fire Animation ===== */
.dl-streak-badge {
    position: relative;
    overflow: visible;
}
.dl-fire-icon {
    display: inline-block;
    transition: transform 0.3s ease;
}
.dl-fire-icon i {
    display: inline-block;
}
.dl-fire-warm i {
    animation: fireWarm 1s ease-in-out infinite;
    filter: drop-shadow(0 0 3px rgba(245, 158, 11, 0.5));
}
.dl-fire-hot i {
    animation: fireHot 0.6s ease-in-out infinite;
    filter: drop-shadow(0 0 6px rgba(245, 158, 11, 0.7));
    font-size: 1.1em;
}
.dl-fire-legendary i {
    animation: fireLegendary 0.4s ease-in-out infinite;
    filter: drop-shadow(0 0 10px rgba(239, 68, 68, 0.8)) drop-shadow(0 -4px 8px rgba(245, 158, 11, 0.6));
    font-size: 1.2em;
}
@keyframes fireWarm {
    0%, 100% { transform: translateY(0) scale(1); }
    50% { transform: translateY(-1px) scale(1.05); }
}
@keyframes fireHot {
    0%, 100% { transform: translateY(0) scale(1) rotate(0deg); }
    25% { transform: translateY(-2px) scale(1.1) rotate(-3deg); }
    75% { transform: translateY(-1px) scale(1.05) rotate(3deg); }
}
@keyframes fireLegendary {
    0%, 100% { transform: translateY(0) scale(1) rotate(0deg); }
    25% { transform: translateY(-3px) scale(1.15) rotate(-5deg); }
    50% { transform: translateY(-1px) scale(1.1) rotate(0deg); }
    75% { transform: translateY(-2px) scale(1.12) rotate(5deg); }
}

/* ===== Score Popup ===== */
.score-popup {
    position: fixed;
    top: 30%;
    left: 50%;
    transform: translateX(-50%);
    font-size: 2.2rem;
    font-weight: 800;
    font-family: var(--dl-font-display);
    color: var(--dl-accent-primary);
    pointer-events: none;
    z-index: 9999;
    animation: floatUp 1.5s ease-out forwards;
    text-shadow: 0 2px 12px rgba(16, 185, 129, 0.5);
    background: rgba(16, 185, 129, 0.1);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    padding: 0.5rem 1.5rem;
    border-radius: var(--dl-radius-lg);
    border: 1px solid rgba(16, 185, 129, 0.2);
}

/* ===== Timer ===== */
.timer-shake {
    animation: shake 0.4s infinite !important;
}
@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-3px); }
    75% { transform: translateX(3px); }
}

/* ===== Milestone Banner ===== */
.milestone-banner {
    text-align: center;
    padding: 0.75rem;
    border-radius: var(--dl-radius-md);
    font-size: 1.1rem;
    font-weight: 600;
    font-family: var(--dl-font-display);
    color: #fff;
    background: linear-gradient(135deg, var(--dl-accent-primary), #34D399);
    animation: milestoneSlide 0.5s ease-out;
}
.milestone-last {
    background: linear-gradient(135deg, var(--dl-accent-warning), #F97316);
}
@keyframes milestoneSlide {
    from { opacity: 0; transform: translateY(-20px) scale(0.9); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

/* ===== Result Performance Tiers ===== */
.dl-result-tier {
    text-align: center;
    padding: 2rem 1.5rem;
    border-radius: var(--dl-radius-lg);
    position: relative;
    overflow: hidden;
}
.dl-result-tier::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    opacity: 0.06;
    pointer-events: none;
}
.dl-tier-icon {
    font-size: 4rem;
    margin-bottom: 0.5rem;
    line-height: 1;
}
.dl-tier-title {
    font-family: var(--dl-font-display);
    font-weight: 800;
    font-size: 2rem;
    margin-bottom: 0.25rem;
}
.dl-tier-subtitle {
    font-size: 1rem;
    margin-bottom: 0;
}

/* Tier: Master (90-100%) */
.dl-tier-master {
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.12), rgba(217, 119, 6, 0.08));
    border: 2px solid rgba(245, 158, 11, 0.3);
}
.dl-tier-master .dl-tier-icon { color: #F59E0B; }
.dl-tier-master .dl-tier-title { color: #F59E0B; }
.dl-tier-master .dl-tier-subtitle { color: var(--dl-text-secondary); }

/* Tier: Great (70-89%) */
.dl-tier-great {
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.12), rgba(52, 211, 153, 0.08));
    border: 2px solid rgba(16, 185, 129, 0.3);
}
.dl-tier-great .dl-tier-icon { color: var(--dl-accent-success); }
.dl-tier-great .dl-tier-title { color: var(--dl-accent-success); }
.dl-tier-great .dl-tier-subtitle { color: var(--dl-text-secondary); }

/* Tier: Good (50-69%) */
.dl-tier-good {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.12), rgba(99, 102, 241, 0.06));
    border: 2px solid rgba(99, 102, 241, 0.3);
}
.dl-tier-good .dl-tier-icon { color: var(--dl-accent-info); }
.dl-tier-good .dl-tier-title { color: var(--dl-accent-info); }
.dl-tier-good .dl-tier-subtitle { color: var(--dl-text-secondary); }

/* Tier: Retry (<50%) */
.dl-tier-retry {
    background: linear-gradient(135deg, rgba(239, 68, 68, 0.08), rgba(239, 68, 68, 0.04));
    border: 2px solid rgba(239, 68, 68, 0.2);
}
.dl-tier-retry .dl-tier-icon { color: var(--dl-accent-danger); }
.dl-tier-retry .dl-tier-title { color: var(--dl-accent-danger); }
.dl-tier-retry .dl-tier-subtitle { color: var(--dl-text-secondary); }

/* ===== Result Stars ===== */
.result-stars {
    font-size: 2.5rem;
    letter-spacing: 4px;
}
.result-stars .bi-star-fill {
    color: var(--dl-accent-warning);
    animation: starPop 0.3s ease-out both;
}
.result-stars .bi-star {
    color: var(--dl-bg-elevated);
}
.result-stars .bi-star-fill:nth-child(1) { animation-delay: 0.1s; }
.result-stars .bi-star-fill:nth-child(2) { animation-delay: 0.2s; }
.result-stars .bi-star-fill:nth-child(3) { animation-delay: 0.3s; }
.result-stars .bi-star-fill:nth-child(4) { animation-delay: 0.4s; }
.result-stars .bi-star-fill:nth-child(5) { animation-delay: 0.5s; }
@keyframes starPop {
    0% { transform: scale(0); opacity: 0; }
    60% { transform: scale(1.3); }
    100% { transform: scale(1); opacity: 1; }
}

/* ===== Score Counter ===== */
.score-counter {
    font-size: 3rem;
    font-weight: 700;
    font-family: var(--dl-font-display);
}

/* Loading state */
.loading {
    opacity: 0.6;
    pointer-events: none;
}

/* Essay criteria list */
.list-group-item {
    transition: background-color var(--dl-transition-fast);
}

/* ===== Quiz Card Feedback ===== */
.dl-quiz-correct {
    animation: correctGlow 0.8s ease;
    border-color: var(--dl-accent-success) !important;
    box-shadow: 0 0 16px rgba(16, 185, 129, 0.2);
}
.dl-quiz-correct .card {
    border-color: var(--dl-accent-success) !important;
}
.dl-quiz-wrong {
    animation: cardShake 0.5s ease;
    border-color: var(--dl-accent-danger) !important;
    box-shadow: 0 0 16px rgba(239, 68, 68, 0.2);
}
.dl-quiz-wrong .card {
    border-color: var(--dl-accent-danger) !important;
}

/* ===== SVG Accuracy Ring (Phase 3) ===== */
.dl-result-ring {
    position: relative;
    display: inline-block;
}
.dl-result-ring svg {
    transform: rotate(-90deg);
}
.dl-result-ring .ring-bg {
    stroke: var(--dl-bg-elevated);
}
.dl-result-ring .ring-progress {
    transition: stroke-dashoffset 1.5s ease;
}
.dl-result-ring .ring-text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-family: var(--dl-font-display);
    font-weight: 800;
    font-size: 2rem;
    color: var(--dl-text-primary);
}

/* ===== Answer Review Accordion (Phase 3) ===== */
.dl-review-item {
    cursor: pointer;
}
.dl-review-item .dl-review-detail {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}
.dl-review-item.open .dl-review-detail {
    max-height: 200px;
}

/* ===== Homepage ===== */
.dl-hero {
    background: linear-gradient(135deg, var(--dl-bg-secondary) 0%, rgba(16, 185, 129, 0.05) 100%);
    border: 1px solid var(--dl-border-color);
    border-radius: var(--dl-radius-lg);
    padding: 3rem;
    position: relative;
    overflow: hidden;
}
.dl-hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -30%;
    width: 60%;
    height: 200%;
    background: radial-gradient(circle, rgba(16, 185, 129, 0.06) 0%, transparent 70%);
    pointer-events: none;
}
.dl-hero::after {
    content: '';
    position: absolute;
    bottom: -20%;
    left: -10%;
    width: 40%;
    height: 150%;
    background: radial-gradient(circle, rgba(99, 102, 241, 0.04) 0%, transparent 70%);
    pointer-events: none;
    animation: floatBlob 8s ease-in-out infinite alternate;
}
@keyframes floatBlob {
    0% { transform: translate(0, 0); }
    100% { transform: translate(20px, -15px); }
}
.dl-hero h1 {
    font-family: var(--dl-font-display);
    font-weight: 800;
    font-size: 2.5rem;
    background: linear-gradient(135deg, var(--dl-accent-primary), #34D399, var(--dl-accent-cyan));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.dl-hero .lead {
    color: var(--dl-text-secondary);
}
.dl-glow-btn {
    box-shadow: 0 0 20px rgba(16, 185, 129, 0.3);
    transition: box-shadow 0.3s ease, transform 0.2s ease;
    animation: glowPulse 3s ease-in-out infinite;
}
.dl-glow-btn:hover {
    box-shadow: 0 0 30px rgba(16, 185, 129, 0.5);
    transform: translateY(-2px);
    animation: none;
}
@keyframes glowPulse {
    0%, 100% { box-shadow: 0 0 20px rgba(16, 185, 129, 0.3); }
    50% { box-shadow: 0 0 30px rgba(16, 185, 129, 0.45); }
}

.dl-stat-card {
    background: var(--dl-bg-card);
    border: 1px solid var(--dl-border-color);
    border-radius: var(--dl-radius-md);
    padding: 1.5rem;
    text-align: center;
    transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
}
.dl-stat-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--dl-shadow-md);
    border-color: rgba(16, 185, 129, 0.3);
}
.dl-stat-card .stat-value {
    font-family: var(--dl-font-display);
    font-size: 2rem;
    font-weight: 800;
}
.dl-stat-card .stat-label {
    color: var(--dl-text-muted);
    font-size: 0.85rem;
    margin-top: 0.25rem;
}

/* Pill chips */
.dl-pill-chip {
    display: inline-block;
    padding: 0.4rem 1rem;
    border-radius: 50px;
    border: 1px solid var(--dl-border-color);
    background: var(--dl-bg-card);
    color: var(--dl-text-secondary);
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all var(--dl-transition-fast);
    text-decoration: none;
}
.dl-pill-chip:hover {
    background: var(--dl-bg-elevated);
    color: var(--dl-text-primary);
}
.dl-pill-chip.active {
    background: var(--dl-accent-primary);
    border-color: var(--dl-accent-primary);
    color: #fff;
}

/* Subject card */
.dl-subject-card {
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    overflow: hidden;
}
.dl-subject-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--dl-shadow-lg);
}
.dl-subject-card:hover .card-body i {
    transform: scale(1.1);
    transition: transform 0.3s ease;
}
.dl-subject-card .card-body i {
    transition: transform 0.3s ease;
}
.dl-subject-card .card-footer .btn {
    transition: transform 0.1s ease, letter-spacing 0.3s ease;
}
.dl-subject-card:hover .card-footer .btn {
    letter-spacing: 0.5px;
}

/* ===== Glassmorphism (Phase 2) ===== */
.dl-glassmorphism {
    background: rgba(30, 41, 59, 0.8);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid rgba(51, 65, 85, 0.5);
    border-radius: var(--dl-radius-lg);
}
[data-theme="light"] .dl-glassmorphism {
    background: rgba(255, 255, 255, 0.85);
    border-color: rgba(226, 232, 240, 0.8);
}
.dl-auth-bg {
    min-height: 60vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, var(--dl-bg-primary) 0%, rgba(16, 185, 129, 0.05) 50%, var(--dl-bg-primary) 100%);
}

/* ===== Mobile Bottom Nav (Phase 2) ===== */
.dl-bottom-nav {
    display: none;
}
@media (max-width: 767.98px) {
    .dl-bottom-nav {
        display: flex;
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        background-color: var(--dl-bg-secondary);
        border-top: 1px solid var(--dl-border-color);
        z-index: 1040;
        padding: 0.5rem 0;
        padding-bottom: calc(0.5rem + env(safe-area-inset-bottom, 0px));
    }
    .dl-bottom-nav a {
        flex: 1;
        display: flex;
        flex-direction: column;
        align-items: center;
        text-decoration: none;
        color: var(--dl-text-muted);
        font-size: 0.7rem;
        font-weight: 600;
        padding: 0.25rem 0;
        transition: color var(--dl-transition-fast);
    }
    .dl-bottom-nav a i {
        font-size: 1.25rem;
        margin-bottom: 2px;
    }
    .dl-bottom-nav a.active,
    .dl-bottom-nav a:hover {
        color: var(--dl-accent-primary);
    }
    .dl-has-bottom-nav {
        padding-bottom: 72px;
    }
}

/* ===== Streak Calendar ===== */
.dl-streak-calendar {
    display: grid;
    grid-template-columns: repeat(13, 1fr);
    gap: 3px;
}
.dl-streak-cell {
    aspect-ratio: 1;
    border-radius: 3px;
    background-color: var(--dl-bg-elevated);
    transition: background-color var(--dl-transition-fast), transform 0.15s ease, box-shadow 0.15s ease;
    position: relative;
    cursor: default;
}
.dl-streak-cell:hover {
    transform: scale(1.3);
    z-index: 2;
    box-shadow: var(--dl-shadow-md);
}
.dl-streak-cell[data-count="1"],
.dl-streak-cell[data-count="2"] {
    background-color: rgba(16, 185, 129, 0.25);
}
.dl-streak-cell[data-count="3"],
.dl-streak-cell[data-count="4"],
.dl-streak-cell[data-count="5"] {
    background-color: rgba(16, 185, 129, 0.5);
}
.dl-streak-cell.dl-streak-high {
    background-color: var(--dl-accent-primary);
}
.dl-streak-cell.dl-streak-today {
    outline: 2px solid var(--dl-accent-warning);
    outline-offset: 1px;
}

/* ===== Mastery Ring ===== */
.dl-mastery-ring {
    position: relative;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}
.dl-mastery-ring svg {
    transform: rotate(-90deg);
}
.dl-mastery-ring .ring-label {
    position: absolute;
    font-family: var(--dl-font-display);
    font-weight: 800;
    color: var(--dl-text-primary);
}

/* Mastery Card */
.dl-mastery-card {
    background: var(--dl-bg-card);
    border: 1px solid var(--dl-border-color);
    border-radius: var(--dl-radius-md);
    padding: 1rem;
    text-align: center;
    transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}
.dl-mastery-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--dl-shadow-md);
}

/* ===== Podium (Phase 4) ===== */
.dl-podium {
    display: flex;
    align-items: flex-end;
    justify-content: center;
    gap: 0.5rem;
    padding: 1rem 0;
    min-height: 180px;
}
.dl-podium-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    flex: 1;
    max-width: 120px;
}
.dl-podium-bar {
    width: 100%;
    border-radius: var(--dl-radius-sm) var(--dl-radius-sm) 0 0;
    display: flex;
    align-items: flex-start;
    justify-content: center;
    padding-top: 1rem;
    font-family: var(--dl-font-display);
    font-weight: 800;
    color: #fff;
}
.dl-podium-bar.gold { background: linear-gradient(180deg, #F59E0B, #D97706); height: 120px; }
.dl-podium-bar.silver { background: linear-gradient(180deg, #94A3B8, #64748B); height: 90px; }
.dl-podium-bar.bronze { background: linear-gradient(180deg, #F97316, #C2410C); height: 70px; }
.dl-podium-name {
    margin-top: 0.5rem;
    font-weight: 600;
    font-size: 0.85rem;
    color: var(--dl-text-primary);
    text-align: center;
}
.dl-podium-points {
    font-size: 0.75rem;
    color: var(--dl-text-muted);
}
.dl-podium-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--dl-accent-primary);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-family: var(--dl-font-display);
    margin-bottom: 0.5rem;
}

/* User hero */
.dl-user-hero {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.5rem;
    background: var(--dl-bg-card);
    border: 1px solid var(--dl-border-color);
    border-radius: var(--dl-radius-lg);
    margin-bottom: 1.5rem;
}
.dl-avatar {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--dl-accent-primary), var(--dl-accent-cyan));
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 800;
    font-family: var(--dl-font-display);
}

/* ===== Flashcard ===== */
.dl-flashcard {
    perspective: 1200px;
    min-height: 300px;
    cursor: pointer;
}
.dl-flashcard-inner {
    position: relative;
    width: 100%;
    min-height: 300px;
    transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1), box-shadow 0.6s ease;
    transform-style: preserve-3d;
}
.dl-flashcard:not(.flipped) .dl-flashcard-inner {
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
}
.dl-flashcard.flipped .dl-flashcard-inner {
    transform: rotateY(180deg);
    box-shadow: 0 12px 32px rgba(16, 185, 129, 0.2);
}
.dl-flashcard-front, .dl-flashcard-back {
    position: absolute;
    width: 100%;
    min-height: 300px;
    backface-visibility: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    border-radius: var(--dl-radius-lg);
    overflow: hidden;
}
.dl-flashcard-front {
    background-color: var(--dl-bg-card);
    border: 1px solid var(--dl-border-color);
}
.dl-flashcard-front::before {
    content: '?';
    position: absolute;
    bottom: -20px;
    right: 10px;
    font-size: 8rem;
    font-family: var(--dl-font-display);
    font-weight: 900;
    color: var(--dl-bg-elevated);
    opacity: 0.3;
    pointer-events: none;
    line-height: 1;
}
.dl-flashcard-back {
    transform: rotateY(180deg);
    background: linear-gradient(135deg, var(--dl-accent-primary), #059669);
    color: #fff;
}
.dl-flashcard-back::before {
    content: '\2713';
    position: absolute;
    bottom: -20px;
    right: 10px;
    font-size: 8rem;
    font-weight: 900;
    color: rgba(255, 255, 255, 0.1);
    pointer-events: none;
    line-height: 1;
}
.dl-flashcard-swipe-left {
    animation: swipeLeft 0.3s ease forwards;
}
.dl-flashcard-swipe-right {
    animation: swipeRight 0.3s ease forwards;
}

/* Progress dots */
.dl-progress-dots {
    display: flex;
    gap: 6px;
    justify-content: center;
    flex-wrap: wrap;
}
.dl-progress-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--dl-bg-elevated);
}
.dl-progress-dot.done { background: var(--dl-accent-primary); }
.dl-progress-dot.current {
    background: var(--dl-accent-warning);
    animation: dotPulse 1s infinite;
}

/* Reading mode */
.dl-reading-content {
    max-width: 720px;
    margin: 0 auto;
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--dl-text-primary);
}
.dl-reading-content h1, .dl-reading-content h2, .dl-reading-content h3 {
    margin-top: 1.5em;
    margin-bottom: 0.5em;
}
.dl-reading-content p { margin-bottom: 1em; }
.dl-reading-content ul, .dl-reading-content ol { margin-bottom: 1em; }
.dl-reading-content table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 1em;
}
.dl-reading-content table td,
.dl-reading-content table th {
    padding: 0.5rem;
    border: 1px solid var(--dl-border-color);
}

/* Sticky CTA */
.dl-sticky-cta {
    position: sticky;
    bottom: 0;
    background: var(--dl-bg-card);
    border-top: 1px solid var(--dl-border-color);
    padding: 0.75rem 1rem;
    z-index: 10;
    border-radius: 0;
}

/* ===== Empty States (Phase 6) ===== */
.dl-empty-state {
    text-align: center;
    padding: 3rem 1.5rem;
    color: var(--dl-text-muted);
}
.dl-empty-state .dl-empty-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
    opacity: 0.3;
}
.dl-empty-state p {
    max-width: 400px;
    margin: 0 auto;
    line-height: 1.6;
}

/* Sound toggle */
.dl-sound-toggle {
    background: none;
    border: 1px solid var(--dl-border-color);
    border-radius: var(--dl-radius-sm);
    color: var(--dl-text-secondary);
    padding: 0.25rem 0.5rem;
    cursor: pointer;
    font-size: 1.1rem;
    line-height: 1;
    transition: all var(--dl-transition-fast);
}
.dl-sound-toggle:hover {
    color: var(--dl-accent-primary);
    border-color: var(--dl-accent-primary);
}

/* ===== Responsive ===== */
@media (max-width: 991.98px) {
    .dinglab-brand-bar .container {
        flex-wrap: nowrap;
    }
    .dinglab-logo { height: 50px; }
    .dinglab-name { height: 26px; }
    .dinglab-nav .nav-link {
        padding: 0.6rem 1rem;
        border-bottom: none;
        border-left: 3px solid transparent;
    }
    .dinglab-nav .nav-link:hover,
    .dinglab-nav .nav-link.active {
        border-left-color: var(--dl-accent-primary);
        border-bottom: none;
    }
    .dinglab-subject-link::before {
        width: 6px;
        height: 6px;
    }
}

@media (max-width: 767.98px) {
    .display-4 { font-size: 2rem; }
    .btn-lg {
        padding: 0.5rem 1rem;
        font-size: 1rem;
    }
    .dl-hero {
        padding: 2rem 1.5rem;
    }
    .dl-hero h1 {
        font-size: 1.8rem;
    }
}

@media (max-width: 575.98px) {
    .dinglab-logo { height: 40px; }
    .dinglab-name { height: 20px; }
}

/* ===== Bonus Reward Popup ===== */
.bonus-popup {
    position: fixed;
    top: 20%;
    left: 50%;
    transform: translateX(-50%);
    z-index: 9999;
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.95), rgba(217, 119, 6, 0.95));
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    color: #fff;
    padding: 1rem 2rem;
    border-radius: var(--dl-radius-lg);
    font-family: var(--dl-font-display);
    font-size: 1.3rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    box-shadow: 0 0 30px rgba(245, 158, 11, 0.5), 0 0 60px rgba(245, 158, 11, 0.2);
    animation: bonusPop 2.5s ease-out forwards;
    pointer-events: none;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.bonus-popup i {
    font-size: 1.6rem;
}

@keyframes bonusPop {
    0% { opacity: 0; transform: translateX(-50%) scale(0.5); }
    15% { opacity: 1; transform: translateX(-50%) scale(1.15); }
    30% { transform: translateX(-50%) scale(1); }
    75% { opacity: 1; transform: translateX(-50%) translateY(0); }
    100% { opacity: 0; transform: translateX(-50%) translateY(-40px); }
}

/* ===== Phase 2: Achievement Unlock Animation ===== */
.achievement-unlock {
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.15), rgba(245, 158, 11, 0.05));
    border: 2px solid var(--dl-accent-warning);
    border-radius: var(--dl-radius-md);
    padding: 1rem;
    animation: achievementGlow 2s ease-in-out;
}

@keyframes achievementGlow {
    0% { box-shadow: 0 0 0 rgba(245, 158, 11, 0); }
    50% { box-shadow: 0 0 30px rgba(245, 158, 11, 0.4); }
    100% { box-shadow: 0 0 10px rgba(245, 158, 11, 0.1); }
}

.achievement-progress-bar {
    height: 8px;
    border-radius: 4px;
    background: var(--dl-bg-elevated);
    overflow: hidden;
}

.achievement-progress-bar .bar-fill {
    height: 100%;
    border-radius: 4px;
    background: linear-gradient(90deg, var(--dl-accent-warning), #D97706);
    transition: width 0.6s ease;
}

/* ===== Phase 3: Nearby Ranking ===== */
.dl-rank-card {
    background: linear-gradient(135deg, var(--dl-bg-card), var(--dl-bg-elevated));
    border: 1px solid var(--dl-border-color);
    border-radius: var(--dl-radius-md);
    padding: 1.25rem;
    text-align: center;
}

.dl-rank-number {
    font-family: var(--dl-font-display);
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--dl-accent-primary);
}

.dl-rank-gap {
    font-size: 0.9rem;
    color: var(--dl-accent-warning);
    font-weight: 600;
}

.dl-nearby-highlight {
    background: rgba(16, 185, 129, 0.1) !important;
    border-left: 3px solid var(--dl-accent-primary);
}

/* ===== Phase 4: Streak Display ===== */
.dl-streak-card {
    background: linear-gradient(135deg, var(--dl-bg-card), var(--dl-bg-elevated));
    border: 1px solid var(--dl-border-color);
    border-radius: var(--dl-radius-md);
    padding: 1.25rem;
    text-align: center;
}

.dl-streak-number {
    font-family: var(--dl-font-display);
    font-size: 3rem;
    font-weight: 900;
    color: var(--dl-accent-warning);
}

.dl-streak-milestone {
    height: 6px;
    border-radius: 3px;
    background: var(--dl-bg-elevated);
    overflow: hidden;
}

.dl-streak-milestone .bar-fill {
    height: 100%;
    border-radius: 3px;
    background: linear-gradient(90deg, var(--dl-accent-warning), var(--dl-accent-danger));
    transition: width 0.6s ease;
}

/* ===== Phase 5: Period Pills ===== */
.dl-period-pills {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.dl-period-pill {
    padding: 0.35rem 1rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    text-decoration: none;
    border: 1px solid var(--dl-border-color);
    color: var(--dl-text-secondary);
    background: var(--dl-bg-card);
    transition: all var(--dl-transition-fast);
}

.dl-period-pill:hover {
    color: var(--dl-accent-primary);
    border-color: var(--dl-accent-primary);
}

.dl-period-pill.active {
    background: var(--dl-accent-primary);
    color: #fff;
    border-color: var(--dl-accent-primary);
}

/* ===== Phase 6: XP Level Badge ===== */
.dl-level-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    padding: 0.15rem 0.6rem;
    border-radius: 20px;
    font-family: var(--dl-font-display);
    font-size: 0.8rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--dl-accent-info), #4F46E5);
    color: #fff;
}

.dl-xp-progress {
    height: 8px;
    border-radius: 4px;
    background: var(--dl-bg-elevated);
    overflow: hidden;
}

.dl-xp-progress .bar-fill {
    height: 100%;
    border-radius: 4px;
    background: linear-gradient(90deg, var(--dl-accent-info), #4F46E5);
    transition: width 0.6s ease;
}

.dl-level-card {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1), rgba(99, 102, 241, 0.05));
    border: 1px solid rgba(99, 102, 241, 0.3);
    border-radius: var(--dl-radius-md);
    padding: 1.25rem;
    text-align: center;
}

.dl-level-title {
    font-family: var(--dl-font-display);
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--dl-accent-info);
}

.multi-dropdown-group {
    display: inline-flex;
    align-items: center;
    flex-wrap: nowrap;
}

/* Matching dropzone glow when chip is selected */
.matching-dropzone.dropzone-active {
    border-color: var(--dl-accent-info) !important;
    box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.25), 0 0 12px rgba(16, 185, 129, 0.15);
    animation: dropzone-pulse 1.5s ease-in-out infinite;
}

@keyframes dropzone-pulse {
    0%, 100% { box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.25); }
    50% { box-shadow: 0 0 0 5px rgba(16, 185, 129, 0.4), 0 0 16px rgba(16, 185, 129, 0.2); }
}

/* Highlight word hover feedback */
.highlight-word {
    transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.highlight-word:hover {
    transform: scale(1.08);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

/* Hover scale for immediate-submit quiz buttons */
.d-grid .btn-outline-primary:hover,
.d-grid .btn-outline-success:hover,
.d-grid .btn-outline-danger:hover,
.d-grid .btn-outline-info:hover,
.d-grid .btn-outline-warning:hover {
    transform: scale(1.02);
    transition: transform 0.15s ease;
}

/* Hotspot card hover */
.hotspot-card:hover {
    transform: scale(1.03);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

/* Word scramble / sentence build letter animation */
#scrambleResult .badge,
#sentenceArea .badge,
#orderArea .badge {
    animation: badge-pop 0.2s ease-out;
}

@keyframes badge-pop {
    0% { transform: scale(0.7); opacity: 0.5; }
    100% { transform: scale(1); opacity: 1; }
}

/* ===== Worksheet Exercises ===== */
.ws-type-card {
    border-left: 4px solid var(--dl-accent-primary);
    transition: transform var(--dl-transition-fast), box-shadow var(--dl-transition-fast);
}
.ws-type-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--dl-shadow-md);
}
.ws-type-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--dl-accent-primary);
    color: #fff;
    font-weight: 700;
    font-size: 0.95rem;
    flex-shrink: 0;
}
.ws-task-card {
    transition: transform var(--dl-transition-fast), box-shadow var(--dl-transition-fast);
}
.ws-task-card:hover {
    transform: translateY(-1px);
    box-shadow: var(--dl-shadow-md);
}
.ws-quote {
    font-style: italic;
    padding: 12px 16px;
    background: var(--dl-bg-elevated);
    border-left: 3px solid var(--dl-accent-info);
    border-radius: var(--dl-radius-sm);
    line-height: 1.6;
}
.ws-quote-good {
    border-left-color: var(--dl-accent-success);
}

/* Exercise type HTML content styles */
.ws-example-content .ws-example-label {
    font-weight: 700;
    color: var(--dl-accent-success);
    font-size: 0.85rem;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    margin-bottom: 8px;
}
.ws-example-content .ws-result-text {
    font-style: italic;
    padding: 12px 16px;
    background: var(--dl-bg-card);
    border: 1px solid var(--dl-border-color);
    border-radius: var(--dl-radius-sm);
    margin: 8px 0;
    line-height: 1.6;
}
.ws-example-content .ws-result-text.ws-weak {
    border-color: var(--dl-accent-danger);
    opacity: 0.85;
}
.ws-example-content .ws-highlight {
    background: rgba(16,185,129,0.15);
    padding: 2px 6px;
    border-radius: 3px;
}
.ws-example-content .ws-note {
    font-size: 0.85rem;
    color: var(--dl-text-muted);
    font-style: italic;
    margin-top: 8px;
}

/* Schema steps */
.ws-schema {
    display: flex;
    flex-direction: column;
    margin: 12px 0;
}
.ws-schema-step {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 10px 14px;
    border: 1px solid var(--dl-border-color);
    border-bottom: none;
}
.ws-schema-step:first-child { border-radius: var(--dl-radius-sm) var(--dl-radius-sm) 0 0; }
.ws-schema-step:last-child { border-bottom: 1px solid var(--dl-border-color); border-radius: 0 0 var(--dl-radius-sm) var(--dl-radius-sm); }
.ws-step-num {
    flex-shrink: 0;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.85rem;
    color: #fff;
}
.ws-s1 { background: rgba(196,122,32,0.1); }
.ws-s1 .ws-step-num { background: #c47a20; }
.ws-s2 { background: rgba(122,74,138,0.1); }
.ws-s2 .ws-step-num { background: #7a4a8a; }
.ws-s3 { background: rgba(46,90,58,0.1); }
.ws-s3 .ws-step-num { background: #2e5a3a; }

/* Markers in example text */
.ws-marker {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    font-weight: 700;
    font-size: 0.75rem;
    color: #fff;
    margin-right: 2px;
}
.ws-m1 { background: #c47a20; }
.ws-m2 { background: #7a4a8a; }
.ws-m3 { background: #2e5a3a; }

/* Tags */
.ws-tag-streszczenie {
    display: inline-block;
    font-size: 0.7rem;
    font-weight: 700;
    color: var(--dl-accent-danger);
    background: rgba(239,68,68,0.15);
    padding: 1px 6px;
    border-radius: 3px;
    letter-spacing: 0.5px;
    text-transform: uppercase;
}
.ws-tag-analiza {
    display: inline-block;
    font-size: 0.7rem;
    font-weight: 700;
    color: var(--dl-accent-success);
    background: rgba(16,185,129,0.15);
    padding: 1px 6px;
    border-radius: 3px;
    letter-spacing: 0.5px;
    text-transform: uppercase;
}