/**
 * Hey Quiz - Design System
 * Version: 1.0
 *
 * A clean, professional design system for the Hey Quiz application.
 * Follows "Calm Productivity" philosophy - spacious, hierarchical, progressive disclosure.
 */

/* ============================================
   CSS CUSTOM PROPERTIES (Design Tokens)
   ============================================ */

:root {
    /* ----- Colors: Light Mode ----- */
    --color-bg: #FAFAFA;
    --color-bg-alt: #F5F5F7;
    --color-surface: #FFFFFF;
    --color-surface-subtle: #F5F5F7;
    --color-surface-hover: #F0F0F2;

    --color-primary: #5144C7;
    --color-primary-hover: #4136A0;
    --color-primary-active: #3A2F8F;
    --color-primary-subtle: #F1F0FF;
    --color-primary-subtle-hover: #E8E6FF;

    --color-accent: #E5BD55;
    --color-accent-hover: #D4A84A;
    --color-accent-subtle: #FEF9E7;

    --color-text-primary: #1D1D1F;
    --color-text-secondary: #6E6E73;
    --color-text-muted: #A1A1A6;
    --color-text-inverse: #FFFFFF;

    --color-border: #E5E5EA;
    --color-border-subtle: #F2F2F7;
    --color-border-strong: #D1D1D6;

    --color-success: #34C759;
    --color-success-subtle: #E8F9ED;
    --color-warning: #FF9500;
    --color-warning-subtle: #FFF4E5;
    --color-warning-text: #B36B00;
    --color-danger: #FF3B30;
    --color-danger-subtle: #FFEBE9;
    --color-info: #007AFF;
    --color-info-subtle: #E5F2FF;

    /* ----- Typography ----- */
    --font-family: 'Poppins', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

    --font-size-xs: 0.75rem;   /* 12px */
    --font-size-sm: 0.8125rem; /* 13px */
    --font-size-base: 0.875rem;/* 14px */
    --font-size-md: 1rem;      /* 16px */
    --font-size-lg: 1.25rem;   /* 20px */
    --font-size-xl: 1.5rem;    /* 24px */
    --font-size-2xl: 1.75rem;  /* 28px */

    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;

    --line-height-tight: 1.25;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.75;

    --letter-spacing-tight: -0.02em;
    --letter-spacing-normal: 0;
    --letter-spacing-wide: 0.02em;

    /* ----- Spacing (8px base) ----- */
    --space-0: 0;
    --space-1: 0.25rem;  /* 4px */
    --space-2: 0.5rem;   /* 8px */
    --space-3: 0.75rem;  /* 12px */
    --space-4: 1rem;     /* 16px */
    --space-5: 1.25rem;  /* 20px */
    --space-6: 1.5rem;   /* 24px */
    --space-8: 2rem;     /* 32px */
    --space-10: 2.5rem;  /* 40px */
    --space-12: 3rem;    /* 48px */
    --space-16: 4rem;    /* 64px */

    /* ----- Border Radius ----- */
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 9999px;

    /* ----- Shadows ----- */
    --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.04), 0 2px 4px rgba(0, 0, 0, 0.03);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.05), 0 4px 6px rgba(0, 0, 0, 0.03);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.06), 0 10px 10px rgba(0, 0, 0, 0.03);

    /* Focus ring */
    --focus-ring: 0 0 0 3px rgba(81, 68, 199, 0.15);
    --focus-ring-danger: 0 0 0 3px rgba(255, 59, 48, 0.15);

    /* ----- Transitions ----- */
    --transition-fast: 150ms ease;
    --transition-normal: 200ms ease;
    --transition-slow: 300ms ease;

    /* ----- Z-index ----- */
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-modal-backdrop: 300;
    --z-modal: 400;
    --z-toast: 500;
}

/* ============================================
   DARK MODE
   Based on participant review styling (#1a1a2e, #2a2a4a)
   ============================================ */

[data-theme="dark"] {
    --color-bg: #1a1a2e;
    --color-bg-alt: #16162a;
    --color-surface: #2a2a4a;
    --color-surface-subtle: #333355;
    --color-surface-hover: #3a3a5a;

    --color-primary: #7B6FD6;
    --color-primary-hover: #8D83DD;
    --color-primary-active: #9F97E4;
    --color-primary-subtle: #2D2A4A;
    --color-primary-subtle-hover: #3A365A;

    --color-accent: #E5BD55;
    --color-accent-hover: #EBC96F;
    --color-accent-subtle: #3D3520;

    --color-text-primary: #e0e0e0;
    --color-text-secondary: #a0a0a0;
    --color-text-muted: #6E6E73;
    --color-text-inverse: #1a1a2e;

    --color-border: rgba(255, 255, 255, 0.1);
    --color-border-subtle: rgba(255, 255, 255, 0.05);
    --color-border-strong: rgba(255, 255, 255, 0.15);

    --color-success: #4ade80;
    --color-success-subtle: rgba(74, 222, 128, 0.1);
    --color-warning: #fbbf24;
    --color-warning-subtle: rgba(251, 191, 36, 0.1);
    --color-warning-text: #fbbf24;
    --color-danger: #f87171;
    --color-danger-subtle: rgba(248, 113, 113, 0.1);
    --color-info: #3b82f6;
    --color-info-subtle: rgba(59, 130, 246, 0.1);

    --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.4), 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.35), 0 2px 4px rgba(0, 0, 0, 0.25);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.4), 0 4px 6px rgba(0, 0, 0, 0.3);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.45), 0 10px 10px rgba(0, 0, 0, 0.3);
}

/* Dark mode for navbar */
[data-theme="dark"] .navbar {
    background-color: #2a2a4a !important;
    border-bottom-color: rgba(255, 255, 255, 0.1) !important;
}

[data-theme="dark"] .navbar-light .navbar-nav .nav-link {
    color: #e0e0e0;
}

[data-theme="dark"] .navbar-light .navbar-nav .nav-link:hover,
[data-theme="dark"] .navbar-light .navbar-nav .nav-link.active {
    color: #E5BD55;
}

/* Dropdown active state (both themes) */
.dropdown-item.active,
.dropdown-item.active:hover,
.dropdown-item.active:focus {
    background-color: rgba(81, 68, 199, 0.1);
    color: #5144C7;
}

[data-theme="dark"] .dropdown-menu {
    background-color: #2a2a4a;
    border-color: rgba(255, 255, 255, 0.1);
}

[data-theme="dark"] .dropdown-item {
    color: #e0e0e0;
}

[data-theme="dark"] .dropdown-item:hover,
[data-theme="dark"] .dropdown-item:focus {
    background-color: rgba(255, 255, 255, 0.1);
    color: #E5BD55;
}

[data-theme="dark"] .dropdown-item.active,
[data-theme="dark"] .dropdown-item.active:hover,
[data-theme="dark"] .dropdown-item.active:focus {
    background-color: rgba(229, 189, 85, 0.15);
    color: #E5BD55;
}

[data-theme="dark"] .dropdown-divider {
    border-color: rgba(255, 255, 255, 0.1);
}

/* Dark mode for footer */
[data-theme="dark"] footer.bg-light {
    background-color: #2a2a4a !important;
    color: #a0a0a0;
}

[data-theme="dark"] footer a {
    color: #E5BD55;
}

/* Dark mode for body */
[data-theme="dark"] body {
    background-color: #1a1a2e;
    color: #e0e0e0;
}

/* Dark mode for form controls */
[data-theme="dark"] .form-control,
[data-theme="dark"] .form-select {
    background-color: #333355;
    border-color: rgba(255, 255, 255, 0.1);
    color: #e0e0e0;
}

[data-theme="dark"] .form-control:focus,
[data-theme="dark"] .form-select:focus {
    background-color: #3a3a5a;
    border-color: #7B6FD6;
    color: #e0e0e0;
}

[data-theme="dark"] .form-control::placeholder {
    color: #6E6E73;
}

/* Dark mode for cards */
[data-theme="dark"] .card {
    background-color: #2a2a4a;
    border-color: rgba(255, 255, 255, 0.1);
}

/* Dark mode alerts */
[data-theme="dark"] .alert-warning {
    background-color: rgba(251, 191, 36, 0.15);
    color: #fbbf24;
    border-left-color: #fbbf24;
}

/* Dark mode for modals */
[data-theme="dark"] .modal-content {
    background-color: #2a2a4a;
    border-color: rgba(255, 255, 255, 0.1);
}

[data-theme="dark"] .modal-header {
    border-bottom-color: rgba(255, 255, 255, 0.1);
}

[data-theme="dark"] .modal-footer {
    border-top-color: rgba(255, 255, 255, 0.1);
    background-color: #333355;
}

[data-theme="dark"] .btn-close {
    filter: invert(1);
}

/* ============================================
   BASE STYLES
   ============================================ */

.ds-page {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: var(--line-height-normal);
    color: var(--color-text-primary);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ============================================
   TYPOGRAPHY
   ============================================ */

.ds-heading-xl {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-semibold);
    line-height: var(--line-height-tight);
    letter-spacing: var(--letter-spacing-tight);
    color: var(--color-text-primary);
    margin: 0;
}

.ds-heading-lg {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    line-height: var(--line-height-tight);
    letter-spacing: var(--letter-spacing-tight);
    color: var(--color-text-primary);
    margin: 0;
}

.ds-heading-md {
    font-size: var(--font-size-md);
    font-weight: var(--font-weight-semibold);
    line-height: var(--line-height-tight);
    color: var(--color-text-primary);
    margin: 0;
}

.ds-heading-sm {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    line-height: var(--line-height-tight);
    color: var(--color-text-primary);
    margin: 0;
}

.ds-text {
    font-size: var(--font-size-base);
    color: var(--color-text-primary);
    margin: 0;
}

.ds-text-sm {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    margin: 0;
}

.ds-text-xs {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
    margin: 0;
}

.ds-text-muted {
    color: var(--color-text-muted);
}

.ds-text-secondary {
    color: var(--color-text-secondary);
}

/* ============================================
   BUTTONS
   ============================================ */

.ds-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    height: 36px;
    padding: 0 var(--space-4);
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
    line-height: 1;
    text-decoration: none;
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.ds-btn:focus-visible {
    outline: none;
    box-shadow: var(--focus-ring);
}

.ds-btn:disabled,
.ds-btn.disabled {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
}

/* Button sizes */
.ds-btn-sm {
    height: 32px;
    padding: 0 var(--space-3);
    font-size: var(--font-size-sm);
}

.ds-btn-lg {
    height: 44px;
    padding: 0 var(--space-6);
    font-size: var(--font-size-md);
}

/* Button variants */
.ds-btn-primary {
    background-color: var(--color-primary);
    border-color: var(--color-primary);
    color: var(--color-text-inverse);
}

.ds-btn-primary:hover:not(:disabled) {
    background-color: var(--color-primary-hover);
    border-color: var(--color-primary-hover);
}

.ds-btn-primary:active:not(:disabled) {
    background-color: var(--color-primary-active);
    border-color: var(--color-primary-active);
}

.ds-btn-secondary {
    background-color: var(--color-surface);
    border-color: var(--color-border);
    color: var(--color-text-primary);
}

.ds-btn-secondary:hover:not(:disabled) {
    background-color: var(--color-surface-hover);
    border-color: var(--color-border-strong);
}

.ds-btn-ghost {
    background-color: transparent;
    border-color: transparent;
    color: var(--color-text-secondary);
}

.ds-btn-ghost:hover:not(:disabled) {
    background-color: var(--color-surface-subtle);
    color: var(--color-text-primary);
}

.ds-btn-ghost-primary {
    background-color: transparent;
    border-color: transparent;
    color: var(--color-primary);
}

.ds-btn-ghost-primary:hover:not(:disabled) {
    background-color: var(--color-primary-subtle);
}

.ds-btn-success {
    background-color: var(--color-success);
    border-color: var(--color-success);
    color: var(--color-text-inverse);
}

.ds-btn-success:hover:not(:disabled) {
    background-color: #2DB84E;
    border-color: #2DB84E;
}

.ds-btn-danger {
    background-color: var(--color-danger);
    border-color: var(--color-danger);
    color: var(--color-text-inverse);
}

.ds-btn-danger:hover:not(:disabled) {
    background-color: #E5352B;
    border-color: #E5352B;
}

.ds-btn-danger:focus-visible {
    box-shadow: var(--focus-ring-danger);
}

.ds-btn-outline-danger {
    background-color: transparent;
    border-color: var(--color-danger);
    color: var(--color-danger);
}

.ds-btn-outline-danger:hover:not(:disabled) {
    background-color: var(--color-danger-subtle);
}

/* Icon-only button */
.ds-btn-icon {
    width: 36px;
    padding: 0;
}

.ds-btn-icon.ds-btn-sm {
    width: 32px;
}

.ds-btn-icon.ds-btn-lg {
    width: 44px;
}

/* ============================================
   FORM INPUTS
   ============================================ */

.ds-input,
.ds-select,
.ds-textarea {
    display: block;
    width: 100%;
    height: 40px;
    padding: 0 var(--space-3);
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: var(--line-height-normal);
    color: var(--color-text-primary);
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.ds-input::placeholder,
.ds-textarea::placeholder {
    color: var(--color-text-muted);
}

.ds-input:hover:not(:disabled),
.ds-select:hover:not(:disabled),
.ds-textarea:hover:not(:disabled) {
    border-color: var(--color-border-strong);
}

.ds-input:focus,
.ds-select:focus,
.ds-textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: var(--focus-ring);
}

.ds-input:disabled,
.ds-select:disabled,
.ds-textarea:disabled {
    background-color: var(--color-surface-subtle);
    color: var(--color-text-muted);
    cursor: not-allowed;
}

/* Answer/Ordering form row - numeracja po lewej stronie pola */
.ds-ordering-row,
.ds-answer-row {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    margin-bottom: var(--space-2);
}

.ds-ordering-number,
.ds-answer-number {
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 44px;
    height: 44px;
    background: var(--color-primary);
    color: var(--color-text-inverse);
    font-weight: var(--font-weight-semibold);
    font-size: var(--font-size-base);
    border-radius: var(--radius-md);
    flex-shrink: 0;
}

/* Toggle switch */
.ds-toggle {
    position: relative;
    display: inline-block;
    width: 48px;
    height: 26px;
    flex-shrink: 0;
}

.ds-toggle input {
    opacity: 0;
    width: 0;
    height: 0;
}

.ds-toggle-slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--color-primary);
    border: 1px solid var(--color-primary);
    transition: .3s;
    border-radius: 26px;
}

.ds-toggle-slider:before {
    position: absolute;
    content: "";
    height: 20px;
    width: 20px;
    left: 2px;
    bottom: 2px;
    background-color: var(--color-text-inverse);
    transition: .3s;
    border-radius: 50%;
}

.ds-toggle input:checked + .ds-toggle-slider:before {
    transform: translateX(22px);
}

.ds-ordering-input {
    flex: 1;
    min-width: 0; /* Pozwala na shrink w flexbox */
}

.ds-textarea {
    height: auto;
    min-height: 80px;
    padding: var(--space-3);
    resize: vertical;
}

.ds-select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%236E6E73' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right var(--space-3) center;
    padding-right: var(--space-10);
}

/* Form label */
.ds-label {
    display: block;
    margin-bottom: var(--space-2);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-primary);
}

.ds-label-required::after {
    content: " *";
    color: var(--color-danger);
}

/* Form help text */
.ds-help-text {
    margin-top: var(--space-1);
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
}

/* Form group */
.ds-form-group {
    margin-bottom: var(--space-4);
}

/* Checkbox & Radio */
.ds-checkbox,
.ds-radio {
    display: flex;
    align-items: flex-start;
    gap: var(--space-2);
    cursor: pointer;
}

.ds-checkbox input,
.ds-radio input {
    flex-shrink: 0;
    width: 18px;
    height: 18px;
    margin-top: 2px;
    accent-color: var(--color-primary);
    cursor: pointer;
}

.ds-checkbox-label,
.ds-radio-label {
    font-size: var(--font-size-base);
    color: var(--color-text-primary);
}

/* Range slider */
.ds-range {
    width: 100%;
    height: 6px;
    background: var(--color-border);
    border-radius: var(--radius-full);
    appearance: none;
    cursor: pointer;
}

.ds-range::-webkit-slider-thumb {
    appearance: none;
    width: 18px;
    height: 18px;
    background: var(--color-primary);
    border-radius: 50%;
    cursor: pointer;
    transition: transform var(--transition-fast);
}

.ds-range::-webkit-slider-thumb:hover {
    transform: scale(1.1);
}

.ds-range::-moz-range-thumb {
    width: 18px;
    height: 18px;
    background: var(--color-primary);
    border: none;
    border-radius: 50%;
    cursor: pointer;
}

/* ============================================
   CARDS
   ============================================ */

.ds-card {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.ds-card-shadow {
    border: none;
    box-shadow: var(--shadow-sm);
}

.ds-card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-4) var(--space-5);
    border-bottom: 1px solid var(--color-border);
    background-color: var(--color-surface);
}

.ds-card-body {
    padding: var(--space-5);
}

.ds-card-footer {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: var(--space-3);
    padding: var(--space-4) var(--space-5);
    border-top: 1px solid var(--color-border);
    background-color: var(--color-surface-subtle);
}

/* ============================================
   BADGES
   ============================================ */

.ds-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    height: 22px;
    padding: 0 var(--space-2);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-medium);
    line-height: 1;
    border-radius: var(--radius-sm);
    white-space: nowrap;
}

.ds-badge-default {
    background-color: var(--color-surface-subtle);
    color: var(--color-text-secondary);
}

.ds-badge-primary {
    background-color: var(--color-primary-subtle);
    color: var(--color-primary);
}

.ds-badge-success {
    background-color: var(--color-success-subtle);
    color: var(--color-success);
}

.ds-badge-warning {
    background-color: var(--color-warning-subtle);
    color: var(--color-warning-text);
}

.ds-badge-danger {
    background-color: var(--color-danger-subtle);
    color: var(--color-danger);
}

.ds-badge-info {
    background-color: var(--color-info-subtle);
    color: var(--color-info);
}

.ds-badge-accent {
    background-color: var(--color-accent-subtle);
    color: #9A7E28;
}

/* ============================================
   COLLAPSIBLE SECTIONS
   ============================================ */

.ds-collapse-trigger {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: var(--space-3) var(--space-4);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-primary);
    background-color: var(--color-surface-subtle);
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: background-color var(--transition-fast);
}

.ds-collapse-trigger:hover {
    background-color: var(--color-surface-hover);
}

.ds-collapse-trigger-icon {
    transition: transform var(--transition-fast);
}

.ds-collapse-trigger[aria-expanded="true"] .ds-collapse-trigger-icon {
    transform: rotate(180deg);
}

.ds-collapse-content {
    padding: var(--space-4);
}

/* ============================================
   QUESTION CARDS (Quiz Editor specific)
   ============================================ */

.ds-question-card {
    display: flex;
    align-items: flex-start;
    gap: var(--space-3);
    padding: var(--space-4);
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.ds-question-card:hover {
    border-color: var(--color-border-strong);
    box-shadow: var(--shadow-sm);
}

.ds-question-card-checkbox {
    flex-shrink: 0;
    margin-top: var(--space-1);
}

.ds-question-card-number {
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    color: var(--color-primary);
    background-color: var(--color-primary-subtle);
    border-radius: var(--radius-sm);
}

.ds-question-card-content {
    flex-grow: 1;
    min-width: 0;
}

.ds-question-card-title {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-primary);
    margin-bottom: var(--space-2);
    word-wrap: break-word;
}

.ds-question-card-meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
    margin-bottom: var(--space-3);
}

.ds-question-card-answers {
    margin-top: var(--space-3);
    padding-top: var(--space-3);
    border-top: 1px solid var(--color-border-subtle);
}

.ds-question-card-answer {
    display: flex;
    align-items: flex-start;
    gap: var(--space-2);
    padding: var(--space-1) 0;
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

.ds-question-card-answer-correct {
    color: var(--color-success);
}

.ds-question-card-answer-icon {
    flex-shrink: 0;
    margin-top: 2px;
}

.ds-question-card-actions {
    display: flex;
    align-items: center;
    gap: var(--space-1);
    flex-shrink: 0;
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.ds-question-card:hover .ds-question-card-actions {
    opacity: 1;
}

/* Touch devices: always show actions (no hover capability) */
@media (hover: none) {
    .ds-question-card-actions {
        opacity: 1;
    }
}

.ds-question-card-explanation {
    margin-top: var(--space-3);
    padding: var(--space-3);
    font-size: var(--font-size-sm);
    font-style: italic;
    color: var(--color-text-secondary);
    background-color: var(--color-surface-subtle);
    border-radius: var(--radius-md);
}

/* ============================================
   SIDEBAR (Settings panel)
   ============================================ */

.ds-sidebar {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.ds-sidebar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-4) var(--space-5);
    border-bottom: 1px solid var(--color-border);
}

.ds-sidebar-body {
    padding: var(--space-4);
}

.ds-sidebar-section {
    margin-bottom: var(--space-4);
}

.ds-sidebar-section:last-child {
    margin-bottom: 0;
}

.ds-sidebar-section-title {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    margin-bottom: var(--space-3);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: var(--letter-spacing-wide);
}

/* ============================================
   PAGE HEADER
   ============================================ */

.ds-page-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-4);
    margin-bottom: var(--space-6);
}

.ds-page-header-left {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.ds-page-header-right {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.ds-page-title {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    margin: 0;
}

.ds-page-subtitle {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    margin: 0;
}

/* ============================================
   DIVIDERS
   ============================================ */

.ds-divider {
    height: 1px;
    background-color: var(--color-border);
    border: none;
    margin: var(--space-4) 0;
}

.ds-divider-subtle {
    background-color: var(--color-border-subtle);
}

/* ============================================
   EMPTY STATES
   ============================================ */

.ds-empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--space-12) var(--space-6);
    text-align: center;
}

.ds-empty-state-icon {
    font-size: 48px;
    color: var(--color-text-muted);
    margin-bottom: var(--space-4);
}

.ds-empty-state-title {
    font-size: var(--font-size-md);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-primary);
    margin-bottom: var(--space-2);
}

.ds-empty-state-description {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-6);
    max-width: 360px;
}

/* ============================================
   ALERTS
   ============================================ */

.ds-alert {
    display: flex;
    align-items: flex-start;
    gap: var(--space-3);
    padding: var(--space-4);
    border-radius: var(--radius-lg);
    font-size: var(--font-size-sm);
}

.ds-alert-icon {
    flex-shrink: 0;
    font-size: 18px;
}

.ds-alert-content {
    flex-grow: 1;
}

.ds-alert-info {
    background-color: var(--color-info-subtle);
    color: var(--color-info);
}

.ds-alert-success {
    background-color: var(--color-success-subtle);
    color: #1B7F37;
}

.ds-alert-warning {
    background-color: var(--color-warning-subtle);
    color: var(--color-warning-text);
}

.ds-alert-danger {
    background-color: var(--color-danger-subtle);
    color: var(--color-danger);
}

/* ============================================
   LAYOUT UTILITIES
   ============================================ */

.ds-flex {
    display: flex;
}

.ds-flex-col {
    flex-direction: column;
}

.ds-items-center {
    align-items: center;
}

.ds-items-start {
    align-items: flex-start;
}

.ds-justify-between {
    justify-content: space-between;
}

.ds-justify-center {
    justify-content: center;
}

.ds-justify-end {
    justify-content: flex-end;
}

.ds-gap-1 { gap: var(--space-1); }
.ds-gap-2 { gap: var(--space-2); }
.ds-gap-3 { gap: var(--space-3); }
.ds-gap-4 { gap: var(--space-4); }
.ds-gap-5 { gap: var(--space-5); }
.ds-gap-6 { gap: var(--space-6); }

.ds-w-full { width: 100%; }
.ds-h-full { height: 100%; }

/* ============================================
   SPACING UTILITIES
   ============================================ */

.ds-m-0 { margin: 0; }
.ds-mt-1 { margin-top: var(--space-1); }
.ds-mt-2 { margin-top: var(--space-2); }
.ds-mt-3 { margin-top: var(--space-3); }
.ds-mt-4 { margin-top: var(--space-4); }
.ds-mt-6 { margin-top: var(--space-6); }
.ds-mb-1 { margin-bottom: var(--space-1); }
.ds-mb-2 { margin-bottom: var(--space-2); }
.ds-mb-3 { margin-bottom: var(--space-3); }
.ds-mb-4 { margin-bottom: var(--space-4); }
.ds-mb-6 { margin-bottom: var(--space-6); }

.ds-p-0 { padding: 0; }
.ds-p-4 { padding: var(--space-4); }
.ds-p-5 { padding: var(--space-5); }
.ds-p-6 { padding: var(--space-6); }

/* ============================================
   RESPONSIVE GRID FOR EDITOR
   ============================================ */

.ds-editor-layout {
    display: grid;
    grid-template-columns: 320px 1fr;
    gap: var(--space-6);
    align-items: start;
}

@media (max-width: 1024px) {
    .ds-editor-layout {
        grid-template-columns: 1fr;
    }
}

.ds-editor-sidebar {
    position: sticky;
    top: var(--space-6);
}

@media (max-width: 1024px) {
    .ds-editor-sidebar {
        position: static;
    }
}

/* ============================================
   MODAL OVERRIDES (for Bootstrap modals)
   ============================================ */

.ds-modal .modal-content {
    border: none;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
}

.ds-modal .modal-header {
    padding: var(--space-5);
    border-bottom: 1px solid var(--color-border);
}

.ds-modal .modal-title {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
}

.ds-modal .modal-body {
    padding: var(--space-5);
}

.ds-modal .modal-footer {
    padding: var(--space-4) var(--space-5);
    border-top: 1px solid var(--color-border);
    background-color: var(--color-surface-subtle);
}

.ds-modal .btn-close {
    opacity: 0.5;
    transition: opacity var(--transition-fast);
}

.ds-modal .btn-close:hover {
    opacity: 1;
}

/* ============================================
   SORTABLE/DRAG HANDLE
   ============================================ */

.ds-drag-handle {
    cursor: grab;
    color: var(--color-text-muted);
    transition: color var(--transition-fast);
}

.ds-drag-handle:hover {
    color: var(--color-text-secondary);
}

.ds-drag-handle:active {
    cursor: grabbing;
}

/* ============================================
   ANIMATIONS
   ============================================ */

@keyframes ds-fade-in {
    from {
        opacity: 0;
        transform: translateY(8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.ds-animate-fade-in {
    animation: ds-fade-in var(--transition-normal) ease-out;
}

/* ============================================
   SCROLLBAR STYLING
   ============================================ */

.ds-scrollbar::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

.ds-scrollbar::-webkit-scrollbar-track {
    background: var(--color-surface-subtle);
    border-radius: var(--radius-full);
}

.ds-scrollbar::-webkit-scrollbar-thumb {
    background: var(--color-border-strong);
    border-radius: var(--radius-full);
}

.ds-scrollbar::-webkit-scrollbar-thumb:hover {
    background: var(--color-text-muted);
}

/* ============================================
   COVER IMAGE UPLOAD
   ============================================ */

.cover-image-upload {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.cover-image-preview {
    position: relative;
    width: 100%;
    aspect-ratio: 16/9;
    border-radius: var(--radius-md);
    overflow: hidden;
    background: var(--color-surface-subtle);
    border: 2px dashed var(--color-border);
    transition: border-color var(--transition-fast);
    cursor: pointer;
}

.cover-image-preview:hover {
    border-color: var(--color-primary);
}

.cover-image-preview.has-image {
    border-style: solid;
    border-color: var(--color-border);
}

.cover-image-preview.has-image:hover {
    border-color: var(--color-primary);
}

.cover-image-preview img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.cover-image-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    gap: var(--space-2);
    color: var(--color-text-muted);
}

.cover-image-placeholder i {
    font-size: 2rem;
}

.cover-image-placeholder span {
    font-size: var(--font-size-sm);
}

.cover-image-actions {
    display: flex;
    gap: var(--space-2);
    flex-wrap: wrap;
}

.cover-upload-status {
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-sm);
}

.cover-upload-status.is-uploading {
    background: var(--color-info-subtle);
    color: var(--color-info);
}

.cover-upload-status.is-success {
    background: var(--color-success-subtle);
    color: var(--color-success);
}

.cover-upload-status.is-error {
    background: var(--color-danger-subtle);
    color: var(--color-danger);
}

/* Quiz block cover (dashboard) */
.quiz-block-cover {
    width: 80px;
    height: 45px;
    border-radius: var(--radius-md);
    overflow: hidden;
    flex-shrink: 0;
    background: var(--color-surface-subtle);
}

.quiz-block-cover img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.quiz-block-cover-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-muted);
    font-size: 1.5rem;
}