/* =============================================
   JSON Formatter & Viewer — Stylesheet
   ============================================= */

:root {
    --bg: #0f172a;
    --surface: #1e293b;
    --surface-hover: #273548;
    --accent: #60a5fa;
    --accent-bright: #3b82f6;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-dim: #64748b;
    --border: rgba(255, 255, 255, 0.08);
    --border-light: rgba(255, 255, 255, 0.12);
    --radius: 8px;
    --radius-lg: 12px;
    --font-ui: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'SF Mono', 'Cascadia Code', 'Fira Code', 'JetBrains Mono', Consolas, monospace;

    /* Syntax colors */
    --syn-string: #4ade80;
    --syn-number: #fb923c;
    --syn-boolean: #c084fc;
    --syn-null: #f87171;
    --syn-key: #60a5fa;
    --syn-brace: #94a3b8;

    /* Diff colors */
    --diff-added-bg: rgba(74, 222, 128, 0.12);
    --diff-added-border: rgba(74, 222, 128, 0.4);
    --diff-removed-bg: rgba(248, 113, 113, 0.12);
    --diff-removed-border: rgba(248, 113, 113, 0.4);
    --diff-changed-bg: rgba(250, 204, 21, 0.12);
    --diff-changed-border: rgba(250, 204, 21, 0.4);
}

/* ===================== RESET ===================== */

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

html, body {
    height: 100%;
    overflow: hidden;
}

body {
    font-family: var(--font-ui);
    background: var(--bg);
    color: var(--text-primary);
    display: flex;
    flex-direction: column;
}

/* ===================== TOP BAR ===================== */

.top-bar {
    background: linear-gradient(135deg, #1e3a5f 0%, #2563eb 50%, #7c3aed 100%);
    padding: 0 24px;
    height: 56px;
    display: flex;
    align-items: center;
    gap: 24px;
    flex-shrink: 0;
    position: relative;
    z-index: 100;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.3);
}

.top-bar-left {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo {
    font-size: 18px;
    font-weight: 700;
    color: #fff;
    letter-spacing: -0.02em;
    white-space: nowrap;
}

.mode-tabs {
    display: flex;
    gap: 4px;
    background: rgba(0, 0, 0, 0.2);
    border-radius: 8px;
    padding: 3px;
}

.mode-tab {
    background: none;
    border: none;
    color: rgba(255, 255, 255, 0.65);
    font-family: var(--font-ui);
    font-size: 13px;
    font-weight: 500;
    padding: 6px 16px;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s;
}

.mode-tab:hover {
    color: #fff;
    background: rgba(255, 255, 255, 0.1);
}

.mode-tab.active {
    color: #fff;
    background: rgba(255, 255, 255, 0.2);
}

.top-bar-right {
    margin-left: auto;
}

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

.btn {
    font-family: var(--font-ui);
    font-size: 13px;
    font-weight: 500;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    white-space: nowrap;
}

.btn-primary {
    background: var(--accent-bright);
    color: #fff;
    padding: 8px 20px;
    font-weight: 600;
}

.btn-primary:hover {
    background: #2563eb;
    box-shadow: 0 0 16px rgba(59, 130, 246, 0.4);
}

.btn-secondary {
    background: var(--surface);
    color: var(--text-secondary);
    padding: 8px 20px;
    border: 1px solid var(--border-light);
}

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

.btn-sm {
    padding: 5px 12px;
    font-size: 12px;
}

.btn-ghost {
    background: none;
    color: rgba(255, 255, 255, 0.7);
    padding: 5px 12px;
}

.btn-ghost:hover {
    background: rgba(255, 255, 255, 0.1);
    color: #fff;
}

.btn-icon {
    background: none;
    border: none;
    color: var(--text-dim);
    padding: 4px 8px;
    font-size: 14px;
    cursor: pointer;
    border-radius: 4px;
    transition: all 0.15s;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.btn-icon:hover {
    background: rgba(255, 255, 255, 0.08);
    color: var(--text-primary);
}

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

.app-container {
    flex: 1;
    display: flex;
    gap: 1px;
    background: var(--bg);
    overflow: hidden;
    min-height: 0;
}

.hidden {
    display: none !important;
}

/* ===================== PANELS ===================== */

.panel {
    background: var(--surface);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.panel-header {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 16px;
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
    min-height: 44px;
}

.panel-title {
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-dim);
}

.panel-actions {
    margin-left: auto;
    display: flex;
    align-items: center;
    gap: 4px;
}

.panel-footer {
    padding: 10px 16px;
    border-top: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: 12px;
    flex-shrink: 0;
}

/* ===================== INPUT PANEL ===================== */

.input-panel {
    width: 40%;
    min-width: 300px;
}

.textarea-wrapper {
    flex: 1;
    display: flex;
    overflow: hidden;
    position: relative;
}

.line-numbers {
    width: 44px;
    flex-shrink: 0;
    padding: 12px 8px 12px 4px;
    text-align: right;
    font-family: var(--font-mono);
    font-size: 12px;
    line-height: 1.6;
    color: var(--text-dim);
    background: rgba(0, 0, 0, 0.15);
    overflow: hidden;
    user-select: none;
    border-right: 1px solid var(--border);
}

#json-input {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 13px;
    line-height: 1.6;
    padding: 12px 16px;
    resize: none;
    outline: none;
    tab-size: 2;
    white-space: pre;
    overflow: auto;
}

#json-input::placeholder {
    color: var(--text-dim);
}

.action-buttons {
    display: flex;
    gap: 8px;
}

/* ===================== ERROR DISPLAY ===================== */

.error-display {
    flex: 1;
    font-size: 12px;
    color: #f87171;
    display: flex;
    align-items: center;
    gap: 6px;
    overflow: hidden;
}

.error-display:empty {
    display: none;
}

.error-display .error-icon {
    flex-shrink: 0;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: rgba(248, 113, 113, 0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 11px;
    font-weight: 700;
}

.error-display .error-text {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* ===================== OUTPUT PANEL ===================== */

.output-panel {
    flex: 1;
    min-width: 300px;
}

.search-bar {
    display: flex;
    align-items: center;
    gap: 4px;
    flex: 1;
    max-width: 360px;
}

.search-input-wrapper {
    position: relative;
    flex: 1;
    display: flex;
    align-items: center;
}

.search-icon {
    position: absolute;
    left: 8px;
    color: var(--text-dim);
    pointer-events: none;
}

#search-input {
    width: 100%;
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--border);
    color: var(--text-primary);
    font-family: var(--font-ui);
    font-size: 12px;
    padding: 5px 60px 5px 28px;
    border-radius: 6px;
    outline: none;
    transition: border-color 0.2s;
}

#search-input:focus {
    border-color: var(--accent);
}

#search-input::placeholder {
    color: var(--text-dim);
}

.search-count {
    position: absolute;
    right: 8px;
    font-size: 11px;
    color: var(--text-dim);
    pointer-events: none;
}

/* ===================== PATH DISPLAY ===================== */

.path-display {
    display: none;
    align-items: center;
    gap: 8px;
    padding: 6px 16px;
    background: rgba(96, 165, 250, 0.06);
    border-bottom: 1px solid rgba(96, 165, 250, 0.15);
    flex-shrink: 0;
}

.path-display.visible {
    display: flex;
}

.path-label {
    font-size: 11px;
    font-weight: 600;
    color: var(--text-dim);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.path-value {
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--accent);
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.btn-copy-path {
    flex-shrink: 0;
}

/* ===================== OUTPUT CONTENT ===================== */

.output-content {
    flex: 1;
    overflow: auto;
    padding: 12px 16px;
    font-family: var(--font-mono);
    font-size: 13px;
    line-height: 1.6;
}

.placeholder-message {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: var(--text-dim);
    text-align: center;
    gap: 12px;
}

.placeholder-icon {
    font-size: 48px;
    font-weight: 700;
    opacity: 0.3;
    font-family: var(--font-mono);
}

.placeholder-message p {
    font-family: var(--font-ui);
    font-size: 14px;
}

/* ===================== TREE VIEW ===================== */

.json-tree {
    list-style: none;
}

.json-tree ul {
    list-style: none;
    padding-left: 20px;
    border-left: 1px solid var(--border);
    margin-left: 4px;
}

.tree-line {
    display: flex;
    align-items: flex-start;
    padding: 1px 0;
    border-radius: 3px;
    cursor: default;
}

.tree-line:hover {
    background: rgba(255, 255, 255, 0.03);
}

.tree-line.search-match {
    background: rgba(250, 204, 21, 0.12);
    outline: 1px solid rgba(250, 204, 21, 0.3);
}

.tree-line.search-current {
    background: rgba(250, 204, 21, 0.25);
    outline: 1px solid rgba(250, 204, 21, 0.5);
}

.tree-line.selected {
    background: rgba(96, 165, 250, 0.1);
}

.tree-toggle {
    width: 16px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--text-dim);
    flex-shrink: 0;
    font-size: 10px;
    transition: transform 0.15s;
    user-select: none;
}

.tree-toggle.expanded {
    transform: rotate(90deg);
}

.tree-toggle-placeholder {
    width: 16px;
    flex-shrink: 0;
}

.tree-key {
    color: var(--syn-key);
    margin-right: 0;
    cursor: pointer;
}

.tree-colon {
    color: var(--syn-brace);
    margin: 0 6px 0 0;
}

.tree-value {
    cursor: pointer;
}

.tree-value.type-string { color: var(--syn-string); }
.tree-value.type-number { color: var(--syn-number); }
.tree-value.type-boolean { color: var(--syn-boolean); }
.tree-value.type-null { color: var(--syn-null); font-style: italic; }

.tree-brace {
    color: var(--syn-brace);
}

.tree-comma {
    color: var(--syn-brace);
}

.tree-info {
    color: var(--text-dim);
    font-size: 12px;
    margin-left: 6px;
    font-style: italic;
}

.tree-children {
    overflow: hidden;
}

.tree-children.collapsed {
    display: none;
}

.tree-value .string-quote {
    color: var(--syn-string);
    opacity: 0.6;
}

/* ===================== EXPORT DROPDOWN ===================== */

.export-dropdown {
    position: relative;
}

.dropdown-menu {
    display: none;
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: 4px;
    background: var(--surface);
    border: 1px solid var(--border-light);
    border-radius: var(--radius);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
    z-index: 200;
    overflow: hidden;
    min-width: 160px;
}

.dropdown-menu.open {
    display: block;
}

.dropdown-item {
    display: block;
    width: 100%;
    background: none;
    border: none;
    color: var(--text-secondary);
    font-family: var(--font-ui);
    font-size: 13px;
    padding: 9px 16px;
    text-align: left;
    cursor: pointer;
    transition: all 0.15s;
}

.dropdown-item:hover {
    background: rgba(255, 255, 255, 0.06);
    color: var(--text-primary);
}

/* ===================== DIFF MODE ===================== */

.diff-container {
    flex-direction: column;
}

.diff-inputs {
    display: flex;
    gap: 1px;
    height: 35%;
    min-height: 180px;
    flex-shrink: 0;
}

.diff-input-panel {
    flex: 1;
}

.diff-textarea {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 13px;
    line-height: 1.6;
    padding: 12px 16px;
    resize: none;
    outline: none;
    tab-size: 2;
    overflow: auto;
    width: 100%;
}

.diff-textarea::placeholder {
    color: var(--text-dim);
}

.diff-actions-bar {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 10px 16px;
    background: var(--bg);
    flex-shrink: 0;
}

.diff-summary {
    font-size: 13px;
    color: var(--text-secondary);
}

.diff-output-panel {
    flex: 1;
    min-height: 0;
}

.diff-output-content {
    flex: 1;
    overflow: auto;
    padding: 12px 16px;
    font-family: var(--font-mono);
    font-size: 13px;
    line-height: 1.6;
}

.diff-legend {
    display: flex;
    gap: 16px;
    margin-left: auto;
}

.legend-item {
    font-size: 11px;
    font-weight: 500;
    padding: 2px 10px;
    border-radius: 4px;
}

.legend-added {
    background: var(--diff-added-bg);
    color: #4ade80;
    border: 1px solid var(--diff-added-border);
}

.legend-removed {
    background: var(--diff-removed-bg);
    color: #f87171;
    border: 1px solid var(--diff-removed-border);
}

.legend-changed {
    background: var(--diff-changed-bg);
    color: #facc15;
    border: 1px solid var(--diff-changed-border);
}

/* Diff tree items */
.diff-line {
    padding: 2px 8px;
    border-radius: 3px;
    margin: 1px 0;
    display: flex;
    align-items: flex-start;
    gap: 8px;
}

.diff-line .diff-marker {
    flex-shrink: 0;
    width: 18px;
    text-align: center;
    font-weight: 700;
    font-size: 12px;
}

.diff-line .diff-path {
    color: var(--text-dim);
    margin-right: 8px;
    font-size: 12px;
    flex-shrink: 0;
}

.diff-line .diff-content {
    flex: 1;
    word-break: break-all;
}

.diff-line.added {
    background: var(--diff-added-bg);
    border-left: 3px solid var(--diff-added-border);
}

.diff-line.added .diff-marker { color: #4ade80; }

.diff-line.removed {
    background: var(--diff-removed-bg);
    border-left: 3px solid var(--diff-removed-border);
}

.diff-line.removed .diff-marker { color: #f87171; }

.diff-line.changed {
    background: var(--diff-changed-bg);
    border-left: 3px solid var(--diff-changed-border);
}

.diff-line.changed .diff-marker { color: #facc15; }

.diff-old-value {
    color: #f87171;
    text-decoration: line-through;
    margin-right: 8px;
}

.diff-new-value {
    color: #4ade80;
}

.diff-arrow {
    color: var(--text-dim);
    margin: 0 6px;
}

/* ===================== STATS BAR ===================== */

.stats-bar {
    display: flex;
    align-items: center;
    gap: 24px;
    padding: 8px 24px;
    background: var(--surface);
    border-top: 1px solid var(--border);
    flex-shrink: 0;
}

.stat-item {
    display: flex;
    align-items: center;
    gap: 6px;
}

.stat-label {
    font-size: 11px;
    color: var(--text-dim);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.stat-value {
    font-size: 12px;
    font-weight: 600;
    color: var(--text-secondary);
    font-family: var(--font-mono);
}

/* ===================== TOAST ===================== */

.toast {
    position: fixed;
    bottom: 60px;
    left: 50%;
    transform: translateX(-50%) translateY(20px);
    background: var(--accent-bright);
    color: #fff;
    font-family: var(--font-ui);
    font-size: 13px;
    font-weight: 500;
    padding: 8px 20px;
    border-radius: 8px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.3);
    opacity: 0;
    pointer-events: none;
    transition: all 0.3s ease;
    z-index: 999;
}

.toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

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

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

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.18);
}

/* ===================== RESPONSIVE ===================== */

@media (max-width: 800px) {
    .app-container {
        flex-direction: column;
    }

    .input-panel {
        width: 100%;
        min-width: 0;
        max-height: 40%;
    }

    .output-panel {
        min-width: 0;
    }

    .diff-inputs {
        flex-direction: column;
    }

    .stats-bar {
        flex-wrap: wrap;
        gap: 12px 20px;
    }

    .search-bar {
        max-width: 200px;
    }
}