/* =========================================================
   Koine Greek Study Tool — Styles
   ========================================================= */

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

:root {
    --font-ui: 'Inter', system-ui, -apple-system, sans-serif;
    --font-serif: 'Noto Serif', Georgia, 'Times New Roman', serif;

    --bg: #f5f5f0;
    --surface: #ffffff;
    --surface-alt: #fafaf7;
    --border: #e2e0d8;
    --border-light: #eceae3;
    --text: #1a1a1a;
    --text-2: #4a4a46;
    --text-3: #8a8a84;
    --accent: #2c5f8a;
    --accent-hover: #1e4a6e;
    --accent-light: #e8f0f7;
    --gold: #9a7b4f;
    --gold-light: #f5f0e6;
    --success: #2d8a4e;
    --success-light: #e6f4ec;
    --error: #c0392b;
    --error-light: #fbeae8;
    --radius: 8px;
    --radius-lg: 12px;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
    --shadow: 0 2px 8px rgba(0,0,0,0.08);
    --shadow-lg: 0 4px 16px rgba(0,0,0,0.1);
}

body {
    font-family: var(--font-ui);
    background: var(--bg);
    color: var(--text);
    line-height: 1.55;
    -webkit-font-smoothing: antialiased;
}

/* ---- HEADER ---- */
header {
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-inner {
    max-width: 960px;
    margin: 0 auto;
    padding: 0.75rem 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    font-family: var(--font-serif);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text);
    letter-spacing: 0.01em;
}

#main-nav { display: flex; gap: 4px; }

.nav-btn {
    font-family: var(--font-ui);
    font-size: 0.85rem;
    font-weight: 500;
    padding: 6px 14px;
    border-radius: 6px;
    border: none;
    background: transparent;
    color: var(--text-2);
    cursor: pointer;
    transition: all 0.15s;
}
.nav-btn:hover { background: var(--surface-alt); color: var(--text); }
.nav-btn.active { background: var(--accent-light); color: var(--accent); }

/* ---- LAYOUT ---- */
main {
    max-width: 960px;
    margin: 0 auto;
    padding: 2rem 1.5rem;
}

.view { display: none; }
.view.active { display: block; }
.hidden { display: none !important; }

.section-header { margin-bottom: 1.5rem; }
.section-header h2 {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 0.2rem;
}
.section-sub { color: var(--text-3); font-size: 0.9rem; }

/* ---- BUTTONS ---- */
.btn {
    font-family: var(--font-ui);
    font-size: 0.88rem;
    font-weight: 500;
    padding: 8px 18px;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    background: var(--surface);
    color: var(--text);
    cursor: pointer;
    transition: all 0.15s;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}
.btn:hover { border-color: #ccc; background: var(--surface-alt); }
.btn:disabled { opacity: 0.35; cursor: not-allowed; }

.btn-primary {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
}
.btn-primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); }

.btn-outline { background: transparent; }
.btn-outline:hover { background: var(--surface-alt); }

.btn-group { display: flex; gap: 8px; flex-wrap: wrap; }
.btn-group.centered { justify-content: center; }

.back-link {
    font-family: var(--font-ui);
    font-size: 0.85rem;
    color: var(--text-3);
    background: none;
    border: none;
    cursor: pointer;
    padding: 2px 0;
    transition: color 0.15s;
}
.back-link:hover { color: var(--text); }

/* ---- CATEGORY GRID ---- */
.category-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 12px;
}

.category-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1.25rem 1rem;
    cursor: pointer;
    transition: all 0.2s;
    text-align: left;
    display: flex;
    flex-direction: column;
    gap: 2px;
}
.category-card:hover {
    border-color: var(--accent);
    box-shadow: var(--shadow);
    transform: translateY(-1px);
}
.cat-icon { font-size: 1.4rem; margin-bottom: 6px; }
.cat-name { font-weight: 600; font-size: 0.95rem; }
.cat-count { font-size: 0.8rem; color: var(--text-3); }

/* ---- MODE GRID ---- */
.mode-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(170px, 1fr));
    gap: 10px;
    margin-bottom: 1.25rem;
}

.mode-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1.1rem 1rem;
    cursor: pointer;
    transition: all 0.2s;
    text-align: left;
    display: flex;
    flex-direction: column;
    gap: 4px;
}
.mode-card:hover {
    border-color: var(--accent);
    box-shadow: var(--shadow);
}

.mode-icon-wrap {
    color: var(--accent);
    margin-bottom: 4px;
}
.mode-label { font-weight: 600; font-size: 0.92rem; }
.mode-desc { font-size: 0.78rem; color: var(--text-3); }

.study-opts {
    display: flex;
    gap: 1.5rem;
    font-size: 0.85rem;
    color: var(--text-2);
}
.study-opts label {
    display: flex;
    align-items: center;
    gap: 5px;
    cursor: pointer;
}

/* ---- STUDY BAR ---- */
.study-bar {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 8px;
}
.progress-label { font-size: 0.85rem; color: var(--text-3); }
.score-label { margin-left: auto; font-weight: 600; font-size: 0.85rem; color: var(--accent); }

.progress-track {
    height: 3px;
    background: var(--border-light);
    border-radius: 2px;
    margin-bottom: 1.75rem;
    overflow: hidden;
}
.progress-fill {
    height: 100%;
    background: var(--accent);
    border-radius: 2px;
    transition: width 0.3s;
    width: 0%;
}

/* ---- FLASHCARD ---- */
.flashcard {
    perspective: 800px;
    cursor: pointer;
    margin: 0 auto 1.5rem;
    max-width: 540px;
    height: 280px;
    outline: none;
}
.flashcard-inner {
    position: relative;
    width: 100%;
    height: 100%;
    transition: transform 0.5s;
    transform-style: preserve-3d;
}
.flashcard.flipped .flashcard-inner { transform: rotateY(180deg); }

.flashcard-face {
    position: absolute;
    inset: 0;
    backface-visibility: hidden;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    box-shadow: var(--shadow);
}
.flashcard-back { transform: rotateY(180deg); }

.flashcard-face p {
    font-size: 1.5rem;
    text-align: center;
    word-break: break-word;
}
.flip-hint {
    position: absolute;
    bottom: 1rem;
    font-size: 0.75rem;
    color: var(--text-3);
}
.notes-text {
    font-size: 0.9rem !important;
    color: var(--text-3);
    margin-top: 0.5rem;
}
.fc-nav { display: flex; justify-content: center; gap: 10px; }

/* ---- GREEK TEXT ---- */
.greek-text {
    font-family: var(--font-serif);
    font-size: 1.4rem;
}

/* ---- QUIZ BODY ---- */
.quiz-body {
    max-width: 580px;
    margin: 0 auto;
}
.quiz-prompt {
    text-align: center;
    padding: 1.25rem 1.5rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    margin-bottom: 1.5rem;
    font-size: 1.3rem;
    box-shadow: var(--shadow-sm);
}
.quiz-sub {
    text-align: center;
    font-size: 1.1rem;
    color: var(--text-2);
    margin-top: -1rem;
    margin-bottom: 1.5rem;
}

/* ---- MULTIPLE CHOICE ---- */
.mc-options { display: grid; gap: 8px; margin-bottom: 1.25rem; }

.mc-option {
    background: var(--surface);
    border: 1.5px solid var(--border);
    border-radius: var(--radius);
    padding: 12px 16px;
    cursor: pointer;
    font-size: 0.95rem;
    font-family: var(--font-ui);
    text-align: left;
    transition: all 0.15s;
    color: var(--text);
}
.mc-option:hover:not(.answered) { border-color: var(--accent); background: var(--accent-light); }
.mc-option.correct { border-color: var(--success); background: var(--success-light); }
.mc-option.wrong { border-color: var(--error); background: var(--error-light); }
.mc-option.answered { cursor: default; }

/* ---- FILL IN BLANK ---- */
.fib-row { display: flex; gap: 8px; margin-bottom: 1rem; }
.fib-input {
    flex: 1;
    font-family: var(--font-ui);
    font-size: 1rem;
    padding: 10px 14px;
    background: var(--surface);
    border: 1.5px solid var(--border);
    border-radius: var(--radius);
    color: var(--text);
    outline: none;
    transition: border-color 0.15s;
}
.fib-input:focus { border-color: var(--accent); }

.feedback {
    padding: 10px 14px;
    border-radius: var(--radius);
    margin-bottom: 1rem;
    font-size: 0.92rem;
    text-align: center;
}
.feedback.correct {
    background: var(--success-light);
    color: var(--success);
    border: 1px solid #b7dfc6;
}
.feedback.wrong {
    background: var(--error-light);
    color: var(--error);
    border: 1px solid #eac5c1;
}

/* ---- TRUE/FALSE ---- */
.tf-row { display: flex; justify-content: center; gap: 12px; margin-bottom: 1rem; }
.btn-tf {
    min-width: 120px;
    padding: 10px 24px;
    font-size: 1rem;
    font-weight: 600;
    font-family: var(--font-ui);
    border-radius: var(--radius);
    border: 1.5px solid var(--border);
    background: var(--surface);
    color: var(--text);
    cursor: pointer;
    transition: all 0.15s;
}
.btn-tf:hover:not(:disabled) { border-color: var(--accent); }
.btn-tf:disabled { cursor: default; }
.btn-tf.correct { border-color: var(--success) !important; background: var(--success-light) !important; }
.btn-tf.wrong { border-color: var(--error) !important; background: var(--error-light) !important; }

/* ---- MATCHING ---- */
.match-area {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.25rem;
    max-width: 680px;
    margin: 0 auto 1.25rem;
}
.match-col { display: flex; flex-direction: column; gap: 8px; }

.match-item {
    background: var(--surface);
    border: 1.5px solid var(--border);
    border-radius: var(--radius);
    padding: 10px 12px;
    cursor: pointer;
    font-size: 0.92rem;
    text-align: center;
    transition: all 0.15s;
    user-select: none;
}
.match-item:hover:not(.matched) { border-color: var(--accent); }
.match-item.selected { border-color: var(--accent); background: var(--accent-light); }
.match-item.matched { border-color: var(--success); background: var(--success-light); opacity: 0.55; cursor: default; }
.match-item.wrong-flash { border-color: var(--error); background: var(--error-light); }

/* ---- PARADIGM TABLE QUIZ ---- */
.paradigm-body {
    max-width: 720px;
    margin: 0 auto;
}
.para-title {
    font-family: var(--font-serif);
    font-size: 1.15rem;
    font-weight: 600;
    text-align: center;
    margin-bottom: 1rem;
    color: var(--text);
}

.para-table-wrap {
    overflow-x: auto;
    margin-bottom: 1.25rem;
}

.para-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.92rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}
.para-table th {
    background: var(--surface-alt);
    font-weight: 600;
    font-size: 0.82rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--text-2);
    padding: 10px 12px;
    border-bottom: 1px solid var(--border);
    text-align: center;
}
.para-table th.row-header {
    text-align: left;
    text-transform: none;
    letter-spacing: 0;
    font-size: 0.88rem;
}
.para-table td {
    padding: 10px 12px;
    border-bottom: 1px solid var(--border-light);
    text-align: center;
    font-family: var(--font-serif);
    font-size: 0.95rem;
    min-width: 80px;
}
.para-table tr:last-child td { border-bottom: none; }
.para-table td.row-label {
    font-family: var(--font-ui);
    font-weight: 500;
    font-size: 0.85rem;
    color: var(--text-2);
    text-align: left;
    background: var(--surface-alt);
}

.para-table td.blank-cell {
    background: var(--gold-light);
    color: var(--gold);
    font-family: var(--font-ui);
    font-weight: 600;
    font-size: 0.85rem;
    cursor: pointer;
    letter-spacing: 0.08em;
    transition: background 0.15s, transform 0.1s;
}
.para-table td.blank-cell:hover {
    background: var(--accent-light);
    color: var(--accent);
}
.para-table td.active-cell {
    background: var(--accent-light);
    border: 2px solid var(--accent);
    color: var(--accent);
    font-weight: 700;
}
.para-table td.correct-cell {
    background: var(--success-light);
    color: var(--success);
    font-family: var(--font-serif);
    font-weight: 400;
}
.para-table td.wrong-cell {
    background: var(--error-light);
    color: var(--error);
    font-family: var(--font-serif);
    font-weight: 400;
}
.para-table td.revealed-cell {
    color: var(--text);
    font-family: var(--font-serif);
}

.para-input-area {
    margin-bottom: 1rem;
}
.para-input-area .fib-row { max-width: 400px; margin: 0 auto 1rem; }
.para-input-area .mc-options { max-width: 500px; margin: 0 auto; }

/* ---- PARADIGM SELECT ---- */
.para-select-layout {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
    margin-bottom: 1.5rem;
}
.para-select-layout.two-col {
    display: grid !important;
    grid-template-columns: 1fr 1fr;
    gap: 1.25rem;
}
.para-section-header {
    font-family: var(--font-ui);
    font-size: 0.72rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-3);
    padding: 0.6rem 0.85rem 0.25rem;
    border-bottom: 1px solid var(--border-light);
    margin-top: 0.25rem;
}
.para-panel {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1.25rem;
    box-shadow: var(--shadow);
}
.para-panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 0.75rem;
}
.para-panel-header h3 {
    font-family: var(--font-serif);
    font-size: 1.1rem;
    margin: 0;
}
.para-panel-actions {
    display: flex;
    gap: 0.4rem;
}
.btn-sm {
    padding: 0.3rem 0.65rem;
    font-size: 0.78rem;
}
.para-select-list {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
    max-height: 360px;
    overflow-y: auto;
}
.para-select-item {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.6rem 0.85rem;
    background: var(--bg);
    border: 1px solid transparent;
    border-radius: var(--radius);
    cursor: pointer;
    transition: border-color 0.15s, background 0.15s;
    user-select: none;
}
.para-select-item:hover {
    border-color: var(--accent);
    background: var(--accent-light);
}
.para-select-item input[type="checkbox"] {
    width: 16px;
    height: 16px;
    accent-color: var(--accent);
    flex-shrink: 0;
}
.para-select-item .para-item-title {
    font-family: var(--font-ui);
    font-weight: 500;
    font-size: 0.88rem;
    color: var(--text);
}
.para-select-item .para-item-info {
    font-size: 0.75rem;
    color: var(--text-2);
    margin-left: auto;
    white-space: nowrap;
}
.para-start-btn {
    width: 100%;
    max-width: 280px;
    margin: 0 auto;
    display: block;
}

/* ---- VERB SELECT ---- */
.verb-select-section .hint {
    font-size: 0.8rem;
    color: var(--text-2);
    margin-bottom: 0.6rem;
}
.verb-search {
    width: 100%;
    padding: 0.55rem 0.85rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-family: var(--font-ui);
    font-size: 0.88rem;
    margin-bottom: 0.5rem;
    background: var(--bg);
    transition: border-color 0.15s;
}
.verb-search:focus {
    outline: none;
    border-color: var(--accent);
}
.verb-picker-list {
    max-height: 200px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 2px;
    margin-bottom: 0.75rem;
}
.verb-picker-item {
    display: flex;
    align-items: baseline;
    gap: 0.5rem;
    padding: 0.45rem 0.7rem;
    border-radius: var(--radius);
    cursor: pointer;
    transition: background 0.12s;
    user-select: none;
}
.verb-picker-item:hover {
    background: var(--accent-light);
}
.verb-picker-item.selected {
    background: var(--accent-light);
    font-weight: 600;
}
.verb-picker-item .vp-lexical {
    font-family: var(--font-serif);
    font-size: 0.92rem;
    color: var(--text);
}
.verb-picker-item .vp-meaning {
    font-family: var(--font-ui);
    font-size: 0.78rem;
    color: var(--text-2);
}
.verb-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.35rem;
}
.verb-tag {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    padding: 0.25rem 0.55rem;
    background: var(--accent-light);
    color: var(--accent);
    border-radius: 99px;
    font-size: 0.78rem;
    font-family: var(--font-serif);
    font-weight: 500;
}
.verb-tag button {
    background: none;
    border: none;
    color: var(--accent);
    cursor: pointer;
    font-size: 0.9rem;
    padding: 0 0 0 2px;
    line-height: 1;
    opacity: 0.5;
}
.verb-tag button:hover { opacity: 1; }

/* ---- RESULTS ---- */
.results-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 2.5rem;
    text-align: center;
    max-width: 480px;
    margin: 2rem auto;
    box-shadow: var(--shadow);
}
.results-card h2 {
    font-family: var(--font-serif);
    margin-bottom: 0.5rem;
}
.results-pct {
    font-size: 3rem;
    font-weight: 700;
    margin: 0.5rem 0;
}
.results-detail { color: var(--text-3); margin-bottom: 1.5rem; }

.results-missed { text-align: left; margin-bottom: 1.5rem; }
.results-missed h4 { margin-bottom: 0.5rem; color: var(--error); font-size: 0.9rem; }
.missed-item {
    padding: 6px 0;
    border-bottom: 1px solid var(--border-light);
    font-size: 0.88rem;
}
.missed-item span { color: var(--text-3); }

/* ---- MANAGE ---- */
.manage-layout {
    display: grid;
    grid-template-columns: 320px 1fr;
    gap: 1.5rem;
    align-items: start;
}

.manage-sidebar {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.manage-sidebar select,
.manage-sidebar input[type="text"],
.manage-sidebar textarea {
    width: 100%;
    font-family: var(--font-ui);
    font-size: 0.88rem;
    padding: 8px 10px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--surface);
    color: var(--text);
    outline: none;
    transition: border-color 0.15s;
}
.manage-sidebar select:focus,
.manage-sidebar input:focus,
.manage-sidebar textarea:focus { border-color: var(--accent); }

.field-label {
    font-size: 0.78rem;
    font-weight: 500;
    color: var(--text-3);
    margin-bottom: 2px;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.add-form, .import-export {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1rem;
    display: flex;
    flex-direction: column;
    gap: 6px;
}
.add-form h3, .import-export h3 {
    font-size: 0.92rem;
    font-weight: 600;
    margin-bottom: 4px;
}

.hint { font-size: 0.75rem; color: var(--text-3); }

.file-label { cursor: pointer; }

.manage-main h3 { font-size: 0.95rem; margin-bottom: 8px; }
.count-badge {
    display: inline-block;
    background: var(--accent-light);
    color: var(--accent);
    font-size: 0.75rem;
    font-weight: 600;
    padding: 1px 8px;
    border-radius: 99px;
    margin-left: 4px;
}

.card-list {
    display: flex;
    flex-direction: column;
    gap: 4px;
    max-height: 500px;
    overflow-y: auto;
}
.card-list-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: var(--surface);
    border: 1px solid var(--border-light);
    border-radius: var(--radius);
    padding: 8px 10px;
    gap: 8px;
}
.card-list-item .card-text { display: flex; gap: 10px; flex: 1; min-width: 0; }
.card-list-item .card-term {
    font-family: var(--font-serif);
    font-weight: 500;
    min-width: 100px;
}
.card-list-item .card-def {
    color: var(--text-3);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    font-size: 0.88rem;
}
.card-list-item .delete-btn {
    background: none;
    border: none;
    color: var(--error);
    cursor: pointer;
    font-size: 1.1rem;
    padding: 2px 6px;
    opacity: 0.35;
    transition: opacity 0.15s;
}
.card-list-item .delete-btn:hover { opacity: 1; }

/* ---- RESPONSIVE ---- */
@media (max-width: 700px) {
    .header-inner { padding: 0.6rem 1rem; }
    main { padding: 1.25rem 1rem; }
    .manage-layout { grid-template-columns: 1fr; }
    .category-grid { grid-template-columns: 1fr 1fr; }
    .mode-grid { grid-template-columns: 1fr 1fr; }
    .flashcard { height: 230px; }
    .match-area { grid-template-columns: 1fr; }
    .fib-row { flex-direction: column; }
    .para-table { font-size: 0.82rem; }
    .para-table td, .para-table th { padding: 8px 6px; }
    .para-select-layout.two-col { grid-template-columns: 1fr; }
}