/* StudyFlow Inspired Styles */

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

:root {
    --bg-color: #f9fafb;
    --surface-color: #ffffff;
    --subtle-surface: #f3f4f6;
    --text-color: #111827;
    --muted-text: #6b7280;
    --border-color: #e5e7eb;
    --accent-color: #10b981;
    --accent-strong: #059669;
    --accent-secondary: #0ea5e9;
   /* --selected-option-color: #fb923c ; */
    --selected-option-color: #2dd4bf;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --shadow: 0 12px 40px rgba(15, 23, 42, 0.08);
    --radius-lg: 16px;
    --radius-md: 12px;
    --radius-sm: 8px;
    --transition: all 0.2s ease;
    --card-gap: 1.5rem;
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'Fira Code', 'JetBrains Mono', 'Source Code Pro', 'SFMono-Regular', Consolas, 'Liberation Mono', monospace;
}

body {
    font-family: var(--font-family);
    background: var(--bg-color);
    color: var(--text-color);
    min-height: 100vh;
}

body.modal-open {
    overflow: hidden;
}

}

body.light-mode {
    background: var(--bg-color);
}

body.dark-mode {
    --bg-color: #0f172a;
    --surface-color: #1e293b;
    --subtle-surface: #111827;
    --text-color: #f8fafc;
    --muted-text: #cbd5f5;
    --border-color: #1f2937;
    --shadow: 0 12px 40px rgba(8, 15, 30, 0.45);
    /* --selected-option-color: #fb923c; */
    --selected-option-color: #2dd4bf;
}

body.dark-mode .btn-tertiary {
    color: var(--text-color);
    border-color: var(--border-color);
}

h1, h2, h3 {
    font-weight: 600;
}

p {
    color: var(--muted-text);
}

button {
    font-family: inherit;
}


.app-header {
    position: sticky;
    top: 0;
    z-index: 100;
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.55rem 1.25rem;
    background: var(--surface-color);
    box-shadow: 0 8px 22px rgba(15, 23, 42, 0.06);
    border-bottom: 1px solid var(--border-color);
}

.header-top {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    flex: 0 0 auto;
}

.header-top-actions {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.header-options-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    padding: 0.35rem 0.7rem;
    min-height: 2.5rem;
    min-width: 2.5rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
    background: var(--surface-color);
    color: var(--text-color);
    font-weight: 600;
    line-height: 1;
    cursor: pointer;
    transition: var(--transition);
    flex: 0 0 auto;
}

.header-options-btn .icon {
    color: var(--accent-color);
}

.icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 1.5rem;
    height: 1.5rem;
    pointer-events: none;
}

.icon svg {
    width: 100%;
    height: 100%;
    display: block;
}

.icon-tools svg,
.icon-hamburger svg,
.icon-gear svg {
    fill: currentColor;
}

.header-toggle .icon,
.floating-actions-toggle .icon {
    width: 1.35rem;
    height: 1.35rem;
}

.header-toggle .icon,
.floating-actions-toggle .icon {
    color: inherit;
}

.header-options-btn:hover,
.header-options-btn:focus-visible {
    border-color: var(--accent-color);
    color: var(--accent-color);
}

.header-options-btn .options-label {
    line-height: 1;
}

.logo {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--accent-color);
}

.header-toggle {
    display: none;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    border: 1px solid var(--border-color);
    background: var(--surface-color);
    color: var(--text-color);
    cursor: pointer;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.header-toggle:focus-visible,
.header-toggle:hover {
    border-color: var(--accent-color);
    color: var(--accent-color);
}

.header-sections {
    display: flex;
    align-items: center;
    gap: 1.25rem;
    width: 100%;
    flex-wrap: wrap;
}

.app-header .input-label {
    font-size: 0.85rem;
}

.app-header .assistive-text {
    display: none;
}

.app-header input[type="number"],
.app-header select {
    padding: 0.45rem 0.6rem;
    font-size: 0.9rem;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.header-main {
    display: flex;
    flex: 1 1 320px;
    gap: 1.15rem;
    align-items: center;
    flex-wrap: wrap;
}

.test-select-group {
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: 0.55rem;
    min-width: 200px;
}

.header-progress {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    flex: 1;
    max-width: 420px;
}

.progress-label {
    font-weight: 600;
    color: var(--muted-text);
}

.progress-group {
    display: flex;
    align-items: center;
    gap: 0.55rem;
    width: 100%;
}

.progress-bar-container {
    flex: 1;
    height: 8px;
    background: var(--subtle-surface);
    border-radius: 999px;
    overflow: hidden;
}

#progress-bar {
    height: 100%;
    width: 0%;
    background: var(--accent-color);
    transition: width 0.3s ease;
}

#progress-text {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--accent-color);
    min-width: 40px;
    text-align: right;
}

.header-controls {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
    justify-content: flex-end;
    flex: 1 1 320px;
}

.timer-settings {
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: 0.6rem;
    min-width: 160px;
}

.timer-input-group {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.timer-input-group input {
    width: 70px;
}

.timer-unit {
    font-weight: 600;
    color: var(--muted-text);
}

.timer-display {
    font-weight: 600;
    color: var(--accent-color);
    min-width: 100px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.45rem 0.75rem;
    border-radius: var(--radius-sm);
    background: var(--subtle-surface);
    border: 1px solid var(--border-color);
    font-size: 0.95rem;
}

.header-actions {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    justify-content: flex-end;
}



.page-wrapper {
    padding: 1.25rem 1rem 4rem;
}

.page-container {
    max-width: 1080px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.page-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-color);
    margin: 0;
}

.mode-tabs {
    display: flex;
    gap: 0.6rem;
    flex-wrap: wrap;
    align-items: center;
}

.mode-tab-button {
    padding: 0.6rem 1.2rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
    background: var(--subtle-surface);
    color: var(--muted-text);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.mode-tab-button:hover,
.mode-tab-button:focus-visible {
    border-color: var(--accent-color);
    color: var(--accent-color);
}

.mode-tab-button.active {
    background: var(--accent-color);
    border-color: var(--accent-color);
    color: #ffffff;
}

.mode-panel {
    display: none;
}

.mode-panel.active {
    display: block;
}

.modal-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(15, 23, 42, 0.45);
    backdrop-filter: blur(4px);
    z-index: 150;
}

.modal {
    position: fixed;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1.5rem;
    z-index: 160;
}

.modal.hidden,
.modal-backdrop.hidden {
    display: none;
}

.modal-content {
    width: min(960px, 100%);
    max-height: calc(100vh - 3rem);
    overflow-y: auto;
    background: var(--surface-color);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    box-shadow: 0 30px 80px rgba(15, 23, 42, 0.22);
    padding: 1.75rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
}

.modal-close {
    background: transparent;
    border: none;
    font-size: 1.75rem;
    line-height: 1;
    cursor: pointer;
    color: var(--muted-text);
    transition: var(--transition);
}

.modal-close:hover,
.modal-close:focus-visible {
    color: var(--accent-color);
}


.modal-quick-settings {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.modal-quick-header {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.quick-settings-grid {
    display: grid;
    gap: 1.25rem;
    align-items: end;
}

@media (min-width: 600px) {
    .quick-settings-grid {
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    }
}

.quick-item {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.quick-item .btn,
.quick-item .file-upload {
    align-self: flex-start;
}

.quick-settings-grid input[type="number"] {
    padding: 0.55rem 0.7rem;
    font-size: 0.9rem;
    max-width: 120px;
}

.modal-summary {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.modal-grid {
    display: grid;
    gap: 1.5rem;
}

@media (min-width: 720px) {
    .modal-grid {
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
        align-items: stretch;
    }
}

.modal-card {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.modal-card-description {
    color: var(--muted-text);
    line-height: 1.5;
}

.modal-card-wide {
    grid-column: 1 / -1;
}

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

.status-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem;
}

.status-chip {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.6rem 0.85rem;
    background: var(--subtle-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
}

.chip-icon {
    font-size: 1.2rem;
}

.chip-body {
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
}


.chip-label {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--muted-text);
}

.chip-value {
    font-weight: 600;
    color: var(--text-color);
}
.card-block {
    background: var(--surface-color);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow);
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.file-upload {
    position: relative;
    overflow: hidden;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.file-upload input[type="file"] {
    position: absolute;
    inset: 0;
    opacity: 0;
    cursor: pointer;
}

.bookmark-bar {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: flex-end;
    gap: 1.25rem;
}

.bookmark-status {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    flex: 1 1 240px;
}

.bookmark-label {
    font-weight: 600;
    color: var(--text-color);
}

.bookmark-list {
    min-height: 48px;
    padding: 0.5rem 0.75rem;
    border: 1px dashed var(--border-color);
    border-radius: var(--radius-md);
    background: var(--subtle-surface);
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    align-items: center;
}

.bookmark-list.empty {
    justify-content: center;
    color: var(--muted-text);
    font-style: italic;
}

.bookmark-pill {
    background: #fef3c7;
    border: none;
    border-radius: 999px;
    padding: 0.4rem 0.9rem;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.bookmark-pill:hover {
    transform: translateY(-2px);
}

.input-label {
    font-weight: 600;
    color: var(--text-color);
}

input[type="number"],
input[type="text"],
select,
textarea {
    padding: 0.75rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
    background: var(--subtle-surface);
    color: var(--text-color);
    font-size: 0.95rem;
    transition: border-color 0.2s ease;
}

input:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: var(--accent-color);
}

.assistive-text {
    font-size: 0.85rem;
}

.test-content {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

#questions-container {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.question {
    background: var(--surface-color);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    padding: 1.25rem 1.5rem;
    box-shadow: var(--shadow);
    display: flex;
    flex-direction: column;
    gap: 1rem;
    position: relative;
}

.question p {
    color: var(--text-color);
}

.question-text {
    display: flex;
    gap: 0.6rem;
    align-items: flex-start;
    flex-wrap: wrap;
}

.question-number {
    font-weight: 700;
    color: var(--accent-secondary);
    line-height: 1.6;
    flex-shrink: 0;
}

.question-body {
    flex: 1 1 0;
    min-width: 0;
    color: var(--text-color);
    line-height: 1.6;
}

.question-body .code-block:first-child {
    margin-top: 0.5rem;
}

.bookmark-button {
    align-self: flex-end;
    position: relative;
    margin-left: auto;
    margin-bottom: 0.25rem;
    padding: 0.4rem 0.85rem;
    border-radius: 999px;
    border: none;
    font-size: 0.8rem;
    font-weight: 600;
    cursor: pointer;
    background: var(--subtle-surface);
    color: var(--muted-text);
    transition: var(--transition);
    box-shadow: 0 6px 16px rgba(15, 23, 42, 0.08);
}

.bookmark-button.active,
.bookmark-button:hover {
    background: var(--accent-color);
    color: #ffffff;
}

.result-banner {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
    box-shadow: var(--shadow);
    margin-bottom: 1.5rem;
    position: relative;
    overflow: hidden;
}

.result-banner::before {
    content: "";
    position: absolute;
    inset: 0;
    opacity: 0.1;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

.result-banner--pass {
    border-color: #6ee7b7;
    background: linear-gradient(135deg, #ecfdf5 0%, #d1fae5 100%);
}

.result-banner--pass::before {
    content: "🎉 🎊 🎈";
    font-size: 1.75rem;
    display: block;
    text-align: right;
    padding: 1rem;
    animation: confetti-drift 6s linear infinite;
}

body.dark-mode .result-banner--pass {
    color: #064e3b;
}

body.dark-mode .result-banner--pass .result-headline,
body.dark-mode .result-banner--pass .result-summary {
    color: inherit;
}

.result-banner--fail {
    border-color: #fca5a5;
    background: linear-gradient(135deg, #fef2f2 0%, #fee2e2 100%);
}

.result-banner--fail::before {
    content: "💧 💧";
    font-size: 1.5rem;
    padding: 1rem;
    animation: drizzle 4s ease-in-out infinite;
}

.result-main {
    display: flex;
    align-items: center;
    gap: 1.25rem;
    flex-wrap: wrap;
}

.result-emoji {
    font-size: clamp(3rem, 6vw, 4.5rem);
    line-height: 1;
    filter: drop-shadow(0 12px 18px rgba(15, 23, 42, 0.15));
    display: inline-flex;
    gap: 0.25rem;
    white-space: nowrap;
}

.result-emoji.party {
    animation: celebration-bounce 1.4s ease-in-out infinite alternate;
}

.result-emoji.sad {
    animation: wobble 1.25s ease-in-out infinite;
}

.result-text {
    flex: 1 1 240px;
}

.result-headline {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-color);
    margin-bottom: 0.35rem;
}

.result-summary {
    color: var(--text-color);
    font-size: 1rem;
    line-height: 1.6;
}

.result-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.result-actions .btn {
    flex: 1 1 180px;
    justify-content: center;
}

.result-actions .btn.btn-tertiary {
    background: rgba(16, 185, 129, 0.1);
}

.result-actions .btn.btn-tertiary:hover {
    background: rgba(16, 185, 129, 0.18);
}

.result-actions .btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

@keyframes celebration-bounce {
    0% {
        transform: translateY(0) scale(1);
    }
    100% {
        transform: translateY(-8px) scale(1.05);
    }
}

@keyframes wobble {
    0%, 100% {
        transform: rotate(-6deg);
    }
    50% {
        transform: rotate(6deg);
    }
}

@keyframes confetti-drift {
    0% {
        transform: translateY(-10%) rotate(-4deg);
        opacity: 0.25;
    }
    50% {
        transform: translateY(5%) rotate(4deg);
        opacity: 0.45;
    }
    100% {
        transform: translateY(-10%) rotate(-4deg);
        opacity: 0.25;
    }
}

@keyframes drizzle {
    0% {
        transform: translateY(-6%) scale(1);
        opacity: 0.28;
    }
    50% {
        transform: translateY(6%) scale(0.95);
        opacity: 0.18;
    }
    100% {
        transform: translateY(-6%) scale(1);
        opacity: 0.28;
    }
}

.options {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
}

.options li {
    background: var(--subtle-surface);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.options li label {
    display: flex;
    gap: 0.75rem;
    padding: 0.9rem 1rem;
    cursor: pointer;
    align-items: flex-start;
}

.options li input[type="radio"],
.options li input[type="checkbox"] {
    accent-color: var(--selected-option-color);
    transition: var(--transition);
    margin-top: 0.25rem;
}

.options li.selected {
    border-color: rgba(14, 165, 233, 0.55);
    background: linear-gradient(90deg, rgba(14, 165, 233, 0.25), rgba(16, 185, 129, 0.2));
    box-shadow: 0 10px 24px rgba(14, 165, 233, 0.18);
}

.options li.selected label {
    color: var(--text-color);
    font-weight: 600;
}

.options li:hover {
    border-color: var(--accent-color);
}

body.dark-mode .options li.selected {
    border-color: rgba(14, 165, 233, 0.7);
    background: linear-gradient(90deg, rgba(14, 165, 233, 0.35), rgba(5, 150, 105, 0.24));
    box-shadow: 0 14px 30px rgba(14, 165, 233, 0.28);
}

body.dark-mode .options li.selected label {
    color: #ffedd5;
}

.option-content {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.option-item.option-has-code label {
    align-items: flex-start;
}

.option-item.option-has-code .option-content {
    width: 100%;
}

.option-text {
    display: block;
    font-family: var(--font-mono);
    font-size: 0.95rem;
    line-height: 1.5;
    white-space: pre-wrap;
    word-break: break-word;
}

.option-inline-code {
    display: inline-block;
    max-width: 100%;
    font-family: var(--font-mono);
    white-space: pre-wrap;
    word-break: break-word;
    background: rgba(15, 23, 42, 0.06);
    border-color: rgba(15, 23, 42, 0.12);
}

.option-code-block {
    margin: 0;
    width: 100%;
    max-width: 100%;
    white-space: pre-wrap;
    word-break: break-word;
    font-family: var(--font-mono);
    background: rgba(15, 23, 42, 0.06);
    border-color: rgba(15, 23, 42, 0.12);
}

.option-code {
    font-family: var(--font-mono);
    display: block;
}

body.dark-mode .option-inline-code,
body.dark-mode .option-code-block {
    background: rgba(148, 163, 184, 0.18);
    border-color: rgba(148, 163, 184, 0.35);
}

.text-area-input {
    width: 100%;
    min-height: 120px;
    resize: vertical;
}

.study-correct-answer,
.correct-answer {
    font-size: 0.9rem;
    color: var(--accent-color);
    background: #ecfdf5;
    border-left: 4px solid var(--accent-color);
    border-radius: var(--radius-md);
    padding: 0.75rem 1rem;
}

.study-explanation,
.explanation {
    font-size: 0.9rem;
    color: var(--text-color);
    background: #eff6ff;
    border-left: 4px solid var(--accent-secondary);
    border-radius: var(--radius-md);
    padding: 0.75rem 1rem;
}

.inline-code {
    background: var(--subtle-surface);
    border: 1px solid rgba(15, 23, 42, 0.1);
    border-radius: var(--radius-sm);
    padding: 0.1rem 0.35rem;
    font-family: 'Fira Code', 'JetBrains Mono', 'Source Code Pro', 'SFMono-Regular', Consolas, 'Liberation Mono', monospace;
    font-size: 0.95em;
}

.code-block {
    background: var(--subtle-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 0.75rem 1rem;
    font-family: 'Fira Code', 'JetBrains Mono', 'Source Code Pro', 'SFMono-Regular', Consolas, 'Liberation Mono', monospace;
    font-size: 0.95rem;
    line-height: 1.6;
    overflow-x: auto;
    margin-top: 0.75rem;
}

body.dark-mode .study-correct-answer,
body.dark-mode .correct-answer {
    background: rgba(16, 185, 129, 0.18);
    color: #6ee7b7;
    border-left-color: rgba(16, 185, 129, 0.6);
}

body.dark-mode .study-explanation,
body.dark-mode .explanation {
    background: rgba(14, 165, 233, 0.16);
    color: var(--text-color);
    border-left-color: rgba(56, 189, 248, 0.55);
}

body.dark-mode .code-block {
    background: rgba(30, 41, 59, 0.75);
    border-color: rgba(148, 163, 184, 0.25);
    color: #e2e8f0;
}

body.dark-mode .inline-code {
    background: rgba(148, 163, 184, 0.18);
    border-color: rgba(148, 163, 184, 0.35);
    color: #f8fafc;
}

body.dark-mode .flashcard {
    background: rgba(15, 23, 42, 0.8);
    border-color: rgba(148, 163, 184, 0.25);
}

body.dark-mode .flashcard--flipped .flashcard-question {
    color: rgba(226, 232, 240, 0.55);
}

body.dark-mode .flashcard-hint {
    color: rgba(148, 163, 184, 0.85);
}

@media (max-width: 960px) {
    .flashcard--wide {
        grid-column: span 1;
    }
}

@media (max-width: 720px) {
    .flashcards-grid {
        grid-template-columns: minmax(0, 1fr);
    }

    .flashcard--full {
        grid-column: span 1;
    }
}

body.study-mode-active .question {
    border-color: var(--accent-secondary);
    box-shadow: 0 18px 40px rgba(14, 165, 233, 0.12);
}

.feedback {
    font-weight: 600;
}

.feedback.correct {
    color: var(--accent-color);
}

.feedback.incorrect {
    color: var(--danger-color);
}

.question.correct {
    border-color: var(--accent-color);
}

.question.incorrect {
    border-color: var(--danger-color);
}

.pagination {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
}

.pagination span {
    font-weight: 600;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.65rem 1.25rem;
    border-radius: var(--radius-sm);
    border: none;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn-primary {
    background: var(--accent-color);
    color: #ffffff;
}

.btn-primary:hover {
    background: var(--accent-strong);
}

.btn-secondary {
    background: var(--subtle-surface);
    color: var(--text-color);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: #e5e7eb;
}

.btn-tertiary {
    background: transparent;
    color: var(--accent-color);
    border: 1px solid var(--accent-color);
}

.btn-tertiary:hover {
    background: rgba(16, 185, 129, 0.08);
}

.flashcards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.25rem;
    align-items: start;
    grid-auto-flow: dense;
    width: 100%;
    justify-items: stretch;
}

.flashcard {
    background: var(--surface-color);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow);
    padding: 1.25rem;
    text-align: left;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    min-height: 0;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    align-items: stretch;
    gap: 0.6rem;
    overflow: hidden;
    word-break: break-word;
    touch-action: manipulation;
}

.flashcard:hover {
    transform: translateY(-4px);
}

.flashcard p {
    margin: 0;
}

.flashcard .flashcard-question,
.flashcard .flashcard-answer {
    text-align: left;
    white-space: pre-wrap;
    word-break: break-word;
    overflow-wrap: anywhere;
}

.flashcard .flashcard-answer {
    opacity: 0;
    transform: translateY(8px);
    transition: opacity 0.2s ease, transform 0.2s ease, max-height 0.3s ease;
    color: var(--accent-color);
    font-weight: 600;
    max-height: 0;
    overflow: hidden;
    pointer-events: none;
    margin-top: 0;
}

.flashcard.flashcard--flipped .flashcard-answer {
    opacity: 1;
    transform: translateY(0);
    max-height: 200rem;
    pointer-events: auto;
    margin-top: 0.75rem;
}

.flashcard.flashcard--flipped .flashcard-question {
    opacity: 0.35;
}

.flashcard .code-block {
    margin-top: 0.5rem;
    text-align: left;
}

.flashcard-hint {
    font-size: 0.75rem;
    color: var(--muted-text);
    transition: opacity 0.2s ease;
    margin-top: 0.25rem;
}

.flashcard.flashcard--flipped .flashcard-hint {
    display: none;
}

.flashcard--wide {
    grid-column: span 2;
    width: 100%;
    max-width: min(720px, 100%);
    justify-self: center;
}

.flashcard--full {
    grid-column: 1 / -1;
    width: 100%;
    max-width: min(960px, 100%);
    justify-self: center;
}

.empty-state {
    margin-top: 1rem;
    text-align: center;
    font-style: italic;
    color: var(--muted-text);
}

.stats-layout {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 1.5rem;
}

.stat-summary {
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
}

.stat-row {
    display: flex;
    justify-content: space-between;
    font-weight: 600;
    color: var(--text-color);
    background: var(--subtle-surface);
    padding: 0.75rem 1rem;
    border-radius: var(--radius-sm);
}

.stat-history {
    display: grid;
    gap: 1rem;
}

.stat-history h3 {
    font-size: 1rem;
    margin-bottom: 0.35rem;
}

.history-list {
    list-style: none;
    background: var(--subtle-surface);
    border-radius: var(--radius-sm);
    padding: 0.75rem 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
    min-height: 80px;
    color: var(--muted-text);
    font-size: 0.9rem;
}

.history-list li {
    color: var(--text-color);
}

.score-value {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--accent-color);
}

#score-filter-container.result-filter-controls {
    margin-top: 0.75rem;
}

.result-filter-controls {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-wrap: wrap;
    color: var(--muted-text);
    font-size: 0.9rem;
}

.result-filter-controls select {
    padding: 0.35rem 0.75rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
    background: var(--surface-color);
    color: var(--text-color);
    font-size: 0.9rem;
}

#filter-empty-state {
    margin-top: 1rem;
}

#result-message {
    font-size: 1rem;
    font-weight: 500;
}

#result-message.pass-message {
    color: var(--accent-color);
}

#result-message.fail-message {
    color: var(--danger-color);
}

#floating-actions {
    position: fixed;
    right: 2rem;
    bottom: 2rem;
    display: flex;
    flex-direction: column-reverse;
    align-items: flex-end;
    gap: 0.5rem;
    z-index: 90;
}

.floating-actions-panel {
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
    align-items: stretch;
}

.floating-actions-panel .btn {
    box-shadow: var(--shadow);
}

.floating-actions-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    border: none;
    background: var(--accent-color);
    color: #ffffff;
    cursor: pointer;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.floating-actions-toggle:focus-visible,
.floating-actions-toggle:hover {
    filter: brightness(0.95);
}

#floating-actions.collapsed .floating-actions-toggle {
    background: var(--surface-color);
    color: var(--accent-color);
    border: 1px solid var(--accent-color);
}

.floating-actions.collapsed .floating-actions-panel {
    display: none;
}

#back-to-top {
    position: fixed;
    left: 50%;
    bottom: 2rem;
    transform: translateX(-50%);
    width: 50px;
    height: 50px;
    border-radius: 50%;
    border: none;
    background: var(--accent-color);
    color: #ffffff;
    font-size: 1.4rem;
    cursor: pointer;
    box-shadow: var(--shadow);
    display: none;
}

#achievement-toast {
    position: fixed;
    left: 50%;
    bottom: 30px;
    transform: translateX(-50%);
    background: var(--accent-color);
    color: #ffffff;
    padding: 0.75rem 1.5rem;
    border-radius: 999px;
    box-shadow: var(--shadow);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
    z-index: 120;
}

#achievement-toast.visible {
    opacity: 1;
}

.app-footer {
    margin-top: 3rem;
    text-align: center;
    color: var(--muted-text);
    font-size: 0.9rem;
}

.hidden {
    display: none !important;
}

@media (max-width: 1024px) {
    .app-header {
        flex-direction: column;
        align-items: stretch;
        gap: 1rem;
        padding: 0.75rem 1rem;
    }

    .header-sections {
        flex-direction: column;
        align-items: stretch;
        gap: 1.25rem;
    }

    .header-main {
        align-items: stretch;
    }

    .header-controls {
        justify-content: flex-start;
        align-items: stretch;
        gap: 1rem;
    }

    .header-main,
    .header-controls {
        flex: 1 1 100%;
    }

    .test-select-group {
        flex-direction: column;
        align-items: stretch;
    }

    .timer-settings {
        flex-direction: column;
        align-items: stretch;
    }


}
@media (max-width: 768px) {
    .app-header {
        position: fixed;
        top: 1rem;
        left: 1rem;
        width: min(90vw, 320px);
        max-height: calc(100vh - 2rem);
        padding: 0.85rem;
        gap: 0.85rem;
        border-radius: var(--radius-lg);
        box-shadow: 0 12px 30px rgba(15, 23, 42, 0.18);
        backdrop-filter: blur(6px);
        flex-direction: column;
        align-items: stretch;
        transform: translateX(0);
        transition: transform 0.32s ease, box-shadow 0.32s ease;
    }

    .app-header.collapsed {
        transform: translateX(calc(-100% + 84px));
        box-shadow: 0 8px 20px rgba(15, 23, 42, 0.15);
    }

    .app-header.collapsed .header-top {
        flex-direction: row;
        justify-content: center;
        gap: 0.4rem;
    }

    .app-header.collapsed .logo {
        font-size: 1rem;
        max-width: 80px;
        overflow: hidden;
        text-overflow: ellipsis;
        white-space: nowrap;
    }

    .header-toggle {
        display: inline-flex;
    }

    .header-top {
        justify-content: space-between;
    }

    .header-options-btn .options-label {
        display: none;
    }

    .header-options-btn {
        width: 44px;
        height: 44px;
        padding: 0;
        border-radius: 50%;
        justify-content: center;
    }

    #floating-header.collapsed #header-sections {
        display: none;
    }

    .header-sections {
        flex-direction: column;
        align-items: stretch;
        gap: 1rem;
        overflow-y: auto;
        max-height: calc(100vh - 4.5rem);
        padding-right: 0.25rem;
    }

    .test-select-group,
    .timer-settings {
        flex-direction: column;
        align-items: stretch;
        gap: 0.5rem;
    }

    .app-header .assistive-text {
        display: block;
        font-size: 0.8rem;
    }

    .header-controls {
        align-items: stretch;
        gap: 1rem;
        width: 100%;
        justify-content: flex-start;
    }

    .timer-settings,
    .timer-display {
        width: 100%;
    }

    .timer-display {
        justify-content: flex-start;
    }

    .header-actions {
        width: 100%;
        justify-content: flex-start;
        flex-direction: column;
    }

    .mode-tabs {
        width: 100%;
    }

    .mode-tab-button {
        flex: 1 1 100%;
    }

    .page-wrapper {
        padding: 1rem 1rem 4rem;
    }

    #floating-actions {
        right: 1rem;
        bottom: 1rem;
        gap: 0.5rem;
    }

    .floating-actions-panel .btn {
        width: 100%;
    }
}

@media (max-width: 640px) {
    .header-main {
        gap: 1rem;
    }

    .progress-group {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }

    .header-actions {
        flex-direction: column;
        align-items: stretch;
    }

    .header-actions .btn {
        width: 100%;
    }

    .test-select-group,
    .timer-settings {
        min-width: 0;
    }

    .timer-input-group input,
    .test-select-group select {
        width: 100%;
        min-width: 0;
    }

    .mode-tab-button {
        flex: 1 1 100%;
    }
}

@media (max-width: 480px) {
    .app-header {
        width: min(92vw, 280px);
        padding: 0.75rem;
    }

    .app-header.collapsed {
        transform: translateX(calc(-100% + 72px));
    }

    .logo {
        font-size: 0.95rem;
    }

    .app-header.collapsed .logo {
        font-size: 0.95rem;
    }

    .header-controls {
        gap: 0.6rem;
    }

    #floating-actions {
        right: 0.75rem;
        bottom: 0.75rem;
    }
}













