/* ── Design tokens ── */
:root {
    --primary:        #4f46e5;
    --primary-hover:  #4338ca;
    --primary-light:  #eef2ff;
    --primary-dark:   #312e81;
    --success:        #059669;
    --success-light:  #ecfdf5;
    --error:          #e11d48;
    --error-light:    #fff1f2;
    --bg:             #f1f4fb;
    --surface:        #ffffff;
    --surface-2:      #f8fafc;
    --border:         #e4e9f2;
    --text:           #1e293b;
    --text-muted:     #64748b;
    --text-subtle:    #94a3b8;
    --radius-sm:      6px;
    --radius:         10px;
    --radius-lg:      14px;
    --shadow-sm:      0 1px 3px rgba(15,23,42,0.08), 0 1px 2px rgba(15,23,42,0.04);
    --shadow:         0 4px 16px rgba(15,23,42,0.08), 0 1px 4px rgba(15,23,42,0.04);
    --shadow-lg:      0 8px 32px rgba(15,23,42,0.10), 0 2px 8px rgba(15,23,42,0.06);
    --transition:     all 0.2s ease;
}

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

/* ── Base ── */
body {
    font-family: 'Inter', 'Segoe UI', system-ui, sans-serif;
    line-height: 1.6;
    color: var(--text);
    background: var(--bg);
    padding: 28px 20px 48px;
    min-height: 100vh;
}

.container {
    max-width: 1020px;
    margin: 0 auto;
}

/* ── Header ── */
.app-header {
    text-align: center;
    margin-bottom: 32px;
    padding: 36px 0 32px;
}

.app-title {
    font-size: 2rem;
    font-weight: 800;
    letter-spacing: -0.5px;
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 60%, #7c3aed 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 8px;
}

.app-subtitle {
    color: var(--text-muted);
    font-size: 15px;
    font-weight: 400;
}

/* ── Card ── */
.card {
    background: var(--surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    padding: 28px;
    margin-bottom: 24px;
    border: 1px solid var(--border);
}

/* ── Input group ── */
.input-group {
    margin-bottom: 20px;
}

.input-label {
    display: block;
    margin-bottom: 7px;
    font-weight: 600;
    font-size: 13px;
    color: var(--text);
    letter-spacing: 0.01em;
}

.input-label i {
    color: var(--primary);
    margin-right: 5px;
}

.textarea {
    width: 100%;
    height: 240px;
    padding: 13px 14px;
    background: var(--surface-2);
    border: 1.5px solid var(--border);
    border-radius: var(--radius);
    font-family: 'Fira Code', 'Consolas', 'Courier New', monospace;
    font-size: 13.5px;
    line-height: 1.65;
    color: var(--text);
    resize: vertical;
    transition: border-color 0.18s, box-shadow 0.18s, background 0.18s;
}

.textarea:focus {
    outline: none;
    background: var(--surface);
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.12);
}

.textarea::placeholder {
    color: var(--text-subtle);
    font-family: 'Segoe UI', system-ui, sans-serif;
    font-size: 13px;
}

/* ── Buttons ── */
.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 7px;
    padding: 9px 20px;
    background: var(--primary);
    color: #fff;
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
    letter-spacing: 0.01em;
    transition: background 0.18s, transform 0.1s, box-shadow 0.18s;
    box-shadow: 0 1px 3px rgba(79,70,229,0.25);
}

.button:hover {
    background: var(--primary-hover);
    box-shadow: 0 3px 10px rgba(79,70,229,0.30);
}

.button:active {
    transform: translateY(1px);
    box-shadow: none;
}

.button i {
    font-size: 13px;
}

.button-group {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.clear-button {
    background: transparent;
    color: var(--text-muted);
    border: 1.5px solid var(--border);
    box-shadow: none;
}

.clear-button:hover {
    background: var(--surface-2);
    color: var(--text);
    border-color: #c8d0e0;
    box-shadow: none;
}

.copy-button {
    background: var(--success);
    box-shadow: 0 1px 3px rgba(5,150,105,0.25);
}

.copy-button:hover {
    background: #047857;
    box-shadow: 0 3px 10px rgba(5,150,105,0.28);
}

/* ── Messages ── */
.message {
    padding: 11px 16px;
    border-radius: var(--radius);
    margin-bottom: 20px;
    font-size: 14px;
    font-weight: 500;
    display: none;
}

.error {
    background: var(--error-light);
    color: var(--error);
    border: 1px solid rgba(225,29,72,0.18);
    border-left: 3px solid var(--error);
    position: relative;
}

.error-main {
    display: block;
}

.error-detail {
    margin-top: 8px;
    font-family: 'Fira Code', 'Consolas', monospace;
    font-size: 12.5px;
    white-space: pre-wrap;
    background: rgba(225,29,72,0.05);
    border-radius: var(--radius-sm);
    padding: 8px 10px;
    color: inherit;
    line-height: 1.5;
}

.fix-popup {
    display: none;
    position: absolute;
    top: 50%;
    right: 12px;
    transform: translateY(-50%);
    z-index: 10;
}

#error-message:hover .fix-popup {
    display: flex;
}

.fix-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 5px 13px;
    background: var(--surface);
    color: var(--error);
    border: 1.5px solid var(--error);
    border-radius: var(--radius-sm);
    font-size: 12.5px;
    font-weight: 600;
    cursor: pointer;
    white-space: nowrap;
    box-shadow: 0 2px 8px rgba(225,29,72,0.15);
    transition: background 0.15s, color 0.15s;
}

.fix-btn:hover {
    background: var(--error);
    color: white;
}

.success {
    background: var(--success-light);
    color: var(--success);
    border: 1px solid rgba(5,150,105,0.18);
    border-left: 3px solid var(--success);
}

/* ── Result container ── */
.result-container {
    margin-top: 24px;
    display: none;
}

.result-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 14px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border);
}

.result-title {
    font-size: 15px;
    font-weight: 700;
    color: var(--text);
}

.result-title i {
    color: var(--primary);
    margin-right: 6px;
}

.result-header-actions {
    display: flex;
    gap: 8px;
    align-items: center;
}

.result-content {
    background: #fafbfc;
    border-radius: var(--radius);
    padding: 14px;
    white-space: pre-wrap;
    font-family: 'Fira Code', 'Consolas', 'Courier New', monospace;
    font-size: 13.5px;
    line-height: 1.65;
    max-height: 600px;
    overflow-y: auto;
    overflow-x: auto;
    border: 1px solid var(--border);
}

.result-content.fv-container {
    background: transparent;
    border: none;
    padding: 0;
    white-space: normal;
    font-family: inherit;
    max-height: 600px;
}

.result-content.has-line-numbers {
    padding-left: 3.5em;
}

/* ── Footer ── */
.footer {
    text-align: center;
    margin-top: 32px;
    padding-top: 16px;
    color: var(--text-subtle);
    font-size: 13px;
    border-top: 1px solid var(--border);
}

/* ── Animations ── */
@keyframes fadeIn  { from { opacity: 0; transform: translateY(-4px); } to { opacity: 1; transform: none; } }
@keyframes fadeOut { from { opacity: 1; } to { opacity: 0; } }

.fade-in  { animation: fadeIn  0.22s ease forwards; }
.fade-out { animation: fadeOut 0.22s ease forwards; }

/* ── JSON syntax colors ── */
.json-key     { color: #7c3aed; }
.json-string  { color: #0f766e; }
.json-number  { color: #0284c7; }
.json-boolean { color: #d97706; }
.json-null    { color: #94a3b8; font-style: italic; }
.json-braces  { color: #475569; }

/* ── Line numbers ── */
.result-content.has-line-numbers {
    position: relative;
    counter-reset: line;
}

.result-content:not(.has-line-numbers) {
    padding-left: 0;
}

.line {
    display: block;
    position: relative;
    white-space: pre-wrap;
}

.line::before {
    content: counter(line);
    counter-increment: line;
    position: absolute;
    left: -3em;
    width: 2.5em;
    text-align: right;
    color: var(--text-subtle);
    font-size: 0.88em;
    border-right: 1px solid var(--border);
    padding-right: 0.5em;
    user-select: none;
}

/* ── Collapsible JSON view ── */
.json-line {
    display: flex;
    align-items: center;
    min-height: 20px;
    position: relative;
    padding: 2px 0;
    border-radius: 3px;
}

.json-line:hover {
    background: rgba(79,70,229,0.04);
}

.line-number {
    display: inline-block;
    width: 48px;
    padding-right: 14px;
    text-align: right;
    color: var(--text-subtle);
    font-size: 12.5px;
    user-select: none;
    flex-shrink: 0;
    border-right: 1px solid var(--border);
}

.line-toggle {
    width: 18px;
    text-align: center;
    flex-shrink: 0;
    cursor: pointer;
    user-select: none;
    color: var(--text-subtle);
    transition: color 0.15s;
    padding: 2px 4px;
    margin-right: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.line-toggle:hover { color: var(--primary); }
.line-toggle i { font-size: 9px; opacity: 0.85; }
.line-toggle:empty { cursor: default; }

.line-content {
    flex: 1;
    white-space: pre;
    font-family: 'Fira Code', 'Consolas', 'Courier New', monospace;
    font-size: 13.5px;
    line-height: 1.65;
    overflow-x: visible;
}

.json-collapsible-line { cursor: pointer; }
.json-grouped-line { display: flex; }
.json-grouped-line[style*="display: none"] { display: none !important; }

/* ── View toggle button ── */
.view-toggle-btn {
    background: transparent;
    color: var(--text-muted);
    border: 1.5px solid var(--border);
    font-size: 13px;
    padding: 7px 14px;
    box-shadow: none;
}

.view-toggle-btn:hover {
    background: var(--primary-light);
    color: var(--primary);
    border-color: var(--primary);
    box-shadow: none;
}

.view-toggle-btn.active {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
    box-shadow: 0 1px 4px rgba(79,70,229,0.25);
}

.view-toggle-btn.active:hover {
    background: var(--primary-hover);
}

/* ── Responsive ── */
@media (max-width: 768px) {
    body { padding: 16px 12px 40px; }
    .card { padding: 20px 16px; }
    .button-group { flex-direction: column; }
    .button { width: 100%; }
    .app-title { font-size: 1.65rem; }
}

/* ── Tabs ── */
.tab-nav {
    display: inline-flex;
    gap: 3px;
    margin-bottom: 26px;
    background: var(--bg);
    border-radius: var(--radius);
    padding: 4px;
    border: 1px solid var(--border);
}

.tab-btn {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    padding: 8px 20px;
    background: transparent;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 13.5px;
    font-weight: 500;
    color: var(--text-muted);
    transition: background 0.18s, color 0.18s, box-shadow 0.18s;
    white-space: nowrap;
}

.tab-btn i {
    font-size: 12px;
    opacity: 0.7;
}

.tab-btn:hover {
    color: var(--primary);
    background: rgba(255,255,255,0.7);
}

.tab-btn.active {
    background: var(--surface);
    color: var(--primary);
    font-weight: 700;
    box-shadow: var(--shadow-sm);
}

.tab-btn.active i {
    opacity: 1;
}

/* ── Schema Validate tab ── */
.schema-panels {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-bottom: 16px;
}

@media (max-width: 700px) {
    .schema-panels { grid-template-columns: 1fr; }
}

.schema-label-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.load-example-btn {
    background: none;
    border: 1.5px solid var(--primary);
    color: var(--primary);
    border-radius: var(--radius-sm);
    padding: 2px 10px;
    font-size: 11.5px;
    cursor: pointer;
    font-weight: 600;
    transition: background 0.15s, color 0.15s;
}

.load-example-btn:hover {
    background: var(--primary);
    color: white;
}

/* ── Schema result area ── */
#schema-result-area {
    margin-top: 20px;
    border-radius: var(--radius);
    overflow: hidden;
    border: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
}

.schema-valid-banner {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 16px 20px;
    background: var(--success-light);
    color: var(--success);
    font-weight: 600;
    font-size: 15px;
    border-left: 4px solid var(--success);
}

.schema-valid-banner i {
    font-size: 20px;
}

.schema-error-banner {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 13px 20px;
    background: var(--error-light);
    color: var(--error);
    font-weight: 600;
    font-size: 14px;
    border-left: 4px solid var(--error);
}

.schema-error-banner i {
    font-size: 16px;
}

.schema-error-list {
    list-style: none;
    padding: 0;
    margin: 0;
    background: var(--surface);
}

.schema-error-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 11px 20px;
    border-bottom: 1px solid var(--bg);
}

.schema-error-item:last-child {
    border-bottom: none;
}

.schema-error-path {
    flex-shrink: 0;
    background: var(--error-light);
    color: var(--error);
    font-family: 'Fira Code', 'Consolas', monospace;
    font-size: 11.5px;
    font-weight: 700;
    padding: 2px 8px;
    border-radius: 4px;
    border: 1px solid rgba(225,29,72,0.2);
    white-space: nowrap;
}

.schema-error-msg {
    color: var(--text-muted);
    font-size: 13.5px;
    line-height: 1.5;
    padding-top: 1px;
}

.schema-parse-error {
    padding: 14px 20px;
    background: var(--surface);
    color: var(--text-muted);
    font-size: 13.5px;
}

.schema-parse-error strong {
    color: var(--error);
}

/* ── Friendly View ── */
.fv-container {
    padding: 0;
    background: transparent;
    border: none;
    white-space: normal;
    font-family: inherit;
}

.fv-table {
    display: flex;
    flex-direction: column;
    background: var(--surface);
    border-radius: var(--radius);
    border: 1px solid var(--border);
    width: 100%;
    min-width: 0;
    box-shadow: var(--shadow-sm);
}

.fv-table-nested {
    border-radius: var(--radius-sm);
    margin-top: 8px;
    box-shadow: none;
    border-color: #e8edf6;
}

.fv-row {
    display: block;
    padding: 10px 18px;
    border-bottom: 1px solid #f0f4f8;
    min-width: 0;
    transition: background 0.1s;
}

.fv-row:last-child { border-bottom: none; }
.fv-row:hover      { background: #f7f9ff; }
.fv-row-complex    { display: block; }

.fv-key {
    display: block;
    font-weight: 700;
    color: var(--text-subtle);
    font-size: 10.5px;
    text-transform: uppercase;
    letter-spacing: 0.6px;
    margin-bottom: 3px;
}

.fv-val, .fv-string {
    display: block;
    color: var(--text);
    font-size: 14px;
    word-break: break-word;
    overflow-wrap: break-word;
    line-height: 1.5;
}

.fv-number {
    color: #0284c7;
    font-family: 'Fira Code', 'Consolas', monospace;
    font-size: 14px;
    font-weight: 500;
}

.fv-null  { color: var(--text-subtle); font-style: italic; font-size: 14px; }
.fv-empty { color: var(--text-subtle); font-style: italic; font-size: 12px; }

.fv-badge {
    display: inline-flex;
    align-items: center;
    padding: 2px 11px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 700;
}

.fv-badge-true  { background: #f0fdf4; color: #166534; border: 1px solid #bbf7d0; }
.fv-badge-false { background: #fff1f2; color: #9f1239; border: 1px solid #fecdd3; }

.fv-tags { display: flex; flex-wrap: wrap; gap: 6px; }

.fv-tag {
    background: var(--surface-2);
    border-radius: var(--radius-sm);
    padding: 3px 10px;
    font-size: 12.5px;
    color: var(--text-muted);
    border: 1px solid var(--border);
}

.fv-nested-details { width: 100%; min-width: 0; display: block; }

.fv-nested-summary {
    color: var(--primary);
    cursor: pointer;
    font-size: 12px;
    font-weight: 600;
    user-select: none;
    list-style: none;
    padding: 2px 0;
    display: inline-flex;
    align-items: center;
    gap: 5px;
}

.fv-nested-summary::-webkit-details-marker { display: none; }
.fv-nested-summary::before { content: '▶'; font-size: 8px; }
.fv-nested-details[open] > .fv-nested-summary::before { content: '▼'; }

.fv-nested-body {
    padding-left: 0;
    border-left: 2px solid #c7d7f8;
    margin-top: 8px;
    min-width: 0;
}

.fv-array-list { display: flex; flex-direction: column; gap: 10px; }

.fv-item-card {
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.fv-item-summary {
    padding: 10px 18px;
    background: linear-gradient(135deg, #f7f9ff 0%, var(--primary-light) 100%);
    cursor: pointer;
    font-size: 12.5px;
    font-weight: 700;
    color: var(--primary-dark);
    list-style: none;
    user-select: none;
    border-bottom: 1px solid var(--border);
}

.fv-item-card:not([open]) > .fv-item-summary { border-bottom: none; }
.fv-item-summary::-webkit-details-marker   { display: none; }
.fv-item-summary::before { content: '▶  '; font-size: 9px; color: var(--primary); }
.fv-item-card[open] > .fv-item-summary::before { content: '▼  '; }
.fv-item-summary i { margin-right: 6px; color: var(--primary); }
.fv-item-body { padding: 0; }