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

:root {
    --bg: #0f0f1a;
    --bg-surface: #1a1a2e;
    --bg-elevated: #222240;
    --bg-input: #16162b;
    --border: #2a2a4a;
    --border-focus: #6c5ce7;
    --text: #e8e8f0;
    --text-dim: #8888a8;
    --text-muted: #5a5a7a;
    --accent: #6c5ce7;
    --accent-hover: #7d6ff0;
    --accent-bg: rgba(108, 92, 231, 0.12);
    --success: #2ecc71;
    --warning: #f39c12;
    --error: #e74c3c;
    --radius: 10px;
    --radius-sm: 6px;
    --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --mono: 'JetBrains Mono', 'SF Mono', 'Fira Code', monospace;
    --safe-bottom: env(safe-area-inset-bottom, 0px);
    --safe-top: env(safe-area-inset-top, 0px);
}

html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
    text-size-adjust: 100%;
}

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    line-height: 1.5;
    min-height: 100dvh;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

/* ===== Scrollbar ===== */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

/* ===== Header ===== */
.app-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--bg-surface);
    border-bottom: 1px solid var(--border);
    padding: 0.6rem 1rem;
    padding-top: calc(0.6rem + var(--safe-top));
    backdrop-filter: blur(12px);
}

.header-inner {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.6rem;
}

.logo-icon { font-size: 1.6rem; }

.logo h1 {
    font-size: 1rem;
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: -0.01em;
}

.tagline {
    font-size: 0.7rem;
    color: var(--text-dim);
    line-height: 1;
}

.gh-link {
    color: var(--text-dim);
    transition: color 0.2s;
    padding: 0.5rem;
    display: flex;
    -webkit-tap-highlight-color: transparent;
}
.gh-link:hover { color: var(--text); }

/* ===== Main ===== */
.app-main {
    max-width: 1400px;
    margin: 0 auto;
    padding: 1rem;
}

/* ===== Sections ===== */
.section { margin-bottom: 1.5rem; }

.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 0.75rem;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.section-header h2 {
    font-size: 1.1rem;
    font-weight: 600;
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.5rem 1rem;
    border: none;
    border-radius: var(--radius-sm);
    font-family: var(--font);
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.15s;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
    min-height: 44px;
    white-space: nowrap;
}

.btn-primary {
    background: var(--accent);
    color: #fff;
}
.btn-primary:hover { background: var(--accent-hover); }
.btn-primary:active { transform: scale(0.97); }

.btn-secondary {
    background: var(--bg-elevated);
    color: var(--text);
    border: 1px solid var(--border);
}
.btn-secondary:hover { border-color: var(--text-muted); }

.btn-group {
    display: flex;
    gap: 0.5rem;
}

.btn-icon {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--bg-elevated);
    color: var(--text);
    font-size: 1rem;
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
}

/* ===== Textarea ===== */
.editor-wrap {
    position: relative;
}

.json-textarea {
    width: 100%;
    min-height: 200px;
    max-height: 50vh;
    padding: 1rem;
    background: var(--bg-input);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-family: var(--mono);
    font-size: 0.8rem;
    line-height: 1.6;
    resize: vertical;
    outline: none;
    transition: border-color 0.2s;
}
.json-textarea:focus { border-color: var(--border-focus); }
.json-textarea::placeholder { color: var(--text-muted); }

.error-msg {
    margin-top: 0.5rem;
    padding: 0.75rem 1rem;
    background: rgba(231, 76, 60, 0.1);
    border: 1px solid rgba(231, 76, 60, 0.3);
    border-radius: var(--radius-sm);
    color: var(--error);
    font-size: 0.85rem;
    font-family: var(--mono);
}

/* ===== Editor Tabs (Mobile) ===== */
.editor-tabs {
    display: flex;
    gap: 2px;
    background: var(--bg-surface);
    border-radius: var(--radius);
    padding: 3px;
    margin-bottom: 0.75rem;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.tab {
    flex: 1;
    padding: 0.6rem 0.75rem;
    background: transparent;
    border: none;
    border-radius: calc(var(--radius) - 2px);
    color: var(--text-dim);
    font-family: var(--font);
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    -webkit-tap-highlight-color: transparent;
    min-height: 44px;
    white-space: nowrap;
}
.tab.active {
    background: var(--accent);
    color: #fff;
}

/* ===== Editor Grid ===== */
.editor-grid {
    display: grid;
    gap: 0.75rem;
}

/* ===== Panel ===== */
.panel {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    min-height: 300px;
    max-height: 70vh;
}

.panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.6rem 0.75rem;
    border-bottom: 1px solid var(--border);
    gap: 0.5rem;
    flex-shrink: 0;
}

.panel-header h3 {
    font-size: 0.85rem;
    font-weight: 600;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.search-input {
    padding: 0.35rem 0.6rem;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text);
    font-family: var(--font);
    font-size: 0.8rem;
    outline: none;
    min-width: 0;
    flex-shrink: 1;
    min-height: 36px;
}
.search-input:focus { border-color: var(--border-focus); }

/* ===== Element Tree ===== */
.tree-container {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    padding: 0.5rem;
    -webkit-overflow-scrolling: touch;
}

.tree-node {
    user-select: none;
    -webkit-user-select: none;
}

.tree-label {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.45rem 0.5rem;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: background 0.1s;
    -webkit-tap-highlight-color: transparent;
    min-height: 40px;
    font-size: 0.82rem;
}
.tree-label:hover { background: var(--bg-elevated); }
.tree-label.selected { background: var(--accent-bg); color: var(--accent); }
.tree-label.hidden-by-search { display: none; }

.tree-toggle {
    width: 18px;
    height: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    font-size: 0.65rem;
    color: var(--text-muted);
    transition: transform 0.15s;
}
.tree-toggle.open { transform: rotate(90deg); }
.tree-toggle.empty { visibility: hidden; }

.tree-type {
    font-size: 0.65rem;
    padding: 0.1rem 0.35rem;
    border-radius: 3px;
    font-weight: 600;
    flex-shrink: 0;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}
.tree-type.t-panel   { background: rgba(108, 92, 231, 0.2); color: #a29bfe; }
.tree-type.t-label   { background: rgba(46, 204, 113, 0.2); color: #2ecc71; }
.tree-type.t-image   { background: rgba(243, 156, 18, 0.2); color: #f39c12; }
.tree-type.t-button  { background: rgba(231, 76, 60, 0.2); color: #e74c3c; }
.tree-type.t-stack   { background: rgba(52, 152, 219, 0.2); color: #3498db; }
.tree-type.t-grid    { background: rgba(155, 89, 182, 0.2); color: #9b59b6; }
.tree-type.t-custom  { background: rgba(149, 165, 166, 0.2); color: #95a5a6; }
.tree-type.t-screen  { background: rgba(241, 196, 15, 0.2); color: #f1c40f; }
.tree-type.t-factory { background: rgba(26, 188, 156, 0.2); color: #1abc9c; }
.tree-type.t-anim    { background: rgba(255, 107, 129, 0.2); color: #ff6b81; }
.tree-type.t-other   { background: rgba(149, 165, 166, 0.15); color: #7f8c8d; }

.tree-name {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    min-width: 0;
}

.tree-children {
    padding-left: 1rem;
    overflow: hidden;
}
.tree-children.collapsed { display: none; }

/* ===== Properties Panel ===== */
.props-container {
    flex: 1;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    padding: 0.5rem;
}

.empty-state {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100%;
    min-height: 150px;
    color: var(--text-muted);
    text-align: center;
    padding: 1rem;
    font-size: 0.85rem;
}

.prop-group {
    margin-bottom: 0.75rem;
}

.prop-group-title {
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-muted);
    padding: 0.4rem 0;
    border-bottom: 1px solid var(--border);
    margin-bottom: 0.5rem;
}

.prop-row {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.4rem;
    min-height: 40px;
}

.prop-label {
    font-size: 0.78rem;
    color: var(--text-dim);
    min-width: 80px;
    flex-shrink: 0;
    font-family: var(--mono);
}

.prop-input {
    flex: 1;
    padding: 0.4rem 0.5rem;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text);
    font-family: var(--mono);
    font-size: 0.8rem;
    outline: none;
    min-height: 38px;
    min-width: 0;
}
.prop-input:focus { border-color: var(--border-focus); }

.prop-select {
    flex: 1;
    padding: 0.4rem 0.5rem;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text);
    font-family: var(--font);
    font-size: 0.8rem;
    outline: none;
    min-height: 38px;
    min-width: 0;
    -webkit-appearance: none;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath d='M3 5l3 3 3-3' stroke='%238888a8' stroke-width='1.5' fill='none'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.5rem center;
    padding-right: 1.5rem;
}

.prop-checkbox-wrap {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    min-height: 38px;
}

.prop-checkbox {
    width: 20px;
    height: 20px;
    accent-color: var(--accent);
}

/* Offset nudge buttons */
.nudge-group {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.3rem;
    flex: 1;
}

.nudge-row {
    display: flex;
    align-items: center;
    gap: 0.3rem;
}

.nudge-btn {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--bg-elevated);
    color: var(--text);
    font-size: 0.85rem;
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
    flex-shrink: 0;
}
.nudge-btn:active {
    background: var(--accent);
    border-color: var(--accent);
}

.nudge-val {
    flex: 1;
    text-align: center;
    font-family: var(--mono);
    font-size: 0.8rem;
    min-width: 0;
}

.prop-step {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    margin-bottom: 0.5rem;
}

.prop-step label {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.step-select {
    padding: 0.3rem 0.4rem;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text);
    font-family: var(--mono);
    font-size: 0.78rem;
    outline: none;
    min-height: 32px;
}

/* ===== Preview ===== */
.preview-viewport {
    flex: 1;
    overflow: auto;
    -webkit-overflow-scrolling: touch;
    display: flex;
    align-items: center;
    justify-content: center;
    background:
        radial-gradient(circle at center, rgba(108, 92, 231, 0.03) 0%, transparent 70%),
        repeating-conic-gradient(var(--bg-elevated) 0% 25%, transparent 0% 50%) 0 0 / 20px 20px;
    padding: 1rem;
    position: relative;
}

.preview-screen {
    width: 320px;
    height: 180px;
    background: rgba(0, 0, 0, 0.6);
    border: 1px solid var(--border);
    border-radius: 4px;
    position: relative;
    overflow: hidden;
    flex-shrink: 0;
    transition: transform 0.2s;
}

.preview-el {
    position: absolute;
    border: 1px dashed rgba(108, 92, 231, 0.5);
    background: rgba(108, 92, 231, 0.08);
    font-size: 0.55rem;
    font-family: var(--mono);
    color: var(--accent);
    padding: 1px 3px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    cursor: pointer;
    transition: border-color 0.15s, background 0.15s;
}
.preview-el:hover,
.preview-el.active {
    border-color: var(--accent);
    background: rgba(108, 92, 231, 0.18);
    z-index: 10;
}
.preview-el.type-label {
    border-color: rgba(46, 204, 113, 0.5);
    background: rgba(46, 204, 113, 0.08);
    color: #2ecc71;
}
.preview-el.type-image {
    border-color: rgba(243, 156, 18, 0.5);
    background: rgba(243, 156, 18, 0.08);
    color: #f39c12;
}

.preview-controls {
    display: flex;
    align-items: center;
    gap: 0.3rem;
    font-size: 0.75rem;
    color: var(--text-dim);
    font-family: var(--mono);
}

/* ===== Modal ===== */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
    display: none;
    align-items: flex-end;
    justify-content: center;
    z-index: 200;
    padding: 0;
}
.modal-overlay.visible {
    display: flex;
}

.modal {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius) var(--radius) 0 0;
    width: 100%;
    max-width: 700px;
    max-height: 90vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--border);
}

.modal-header h3 { font-size: 1rem; }

.btn-close {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: none;
    border: none;
    color: var(--text-dim);
    font-size: 1.5rem;
    cursor: pointer;
}

.modal .json-textarea {
    flex: 1;
    border: none;
    border-radius: 0;
    min-height: 40vh;
    resize: none;
    color: #e8e8f0 !important;
    background: #16162b !important;
    -webkit-text-fill-color: #e8e8f0;
    opacity: 1 !important;
}

.modal-actions {
    display: flex;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
    padding-bottom: calc(0.75rem + var(--safe-bottom));
    border-top: 1px solid var(--border);
}
.modal-actions .btn { flex: 1; }

/* ===== Footer ===== */
.app-footer {
    max-width: 1400px;
    margin: 2rem auto 0;
    padding: 0 1rem 2rem;
    padding-bottom: calc(2rem + var(--safe-bottom));
}

.seo-content {
    padding: 1.5rem;
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    margin-bottom: 1rem;
}

.seo-content h2 {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
}

.seo-content h3 {
    font-size: 0.95rem;
    margin: 1rem 0 0.4rem;
}

.seo-content p, .seo-content li {
    font-size: 0.85rem;
    color: var(--text-dim);
    line-height: 1.7;
}

.seo-content ul, .seo-content ol {
    padding-left: 1.2rem;
}

.seo-content code {
    background: var(--bg-elevated);
    padding: 0.15rem 0.4rem;
    border-radius: 3px;
    font-family: var(--mono);
    font-size: 0.8rem;
}

.footer-bottom {
    text-align: center;
    color: var(--text-muted);
    font-size: 0.8rem;
}

.footer-bottom a {
    color: var(--accent);
    text-decoration: none;
}

.footer-links {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-top: 0.4rem;
}

.footer-links a {
    color: var(--text-dim);
    text-decoration: none;
    font-size: 0.78rem;
}
.footer-links a:hover { color: var(--text); }

/* ===== Toast ===== */
.toast {
    position: fixed;
    bottom: calc(1rem + var(--safe-bottom));
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: var(--success);
    color: #fff;
    padding: 0.6rem 1.2rem;
    border-radius: var(--radius);
    font-size: 0.85rem;
    font-weight: 600;
    z-index: 300;
    opacity: 0;
    transition: all 0.3s ease;
    pointer-events: none;
    white-space: nowrap;
}
.toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

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

/* Mobile: show only active tab panel */
@media (max-width: 768px) {
    .editor-grid { grid-template-columns: 1fr; }

    .panel[data-panel] { display: none; }
    .panel[data-panel].active-panel { display: flex; }

    .panel { max-height: 65vh; min-height: 250px; }

    .app-main { padding: 0.6rem; }

    .section-header { flex-direction: column; align-items: flex-start; }
    .section-header .btn-group { width: 100%; }
    .section-header .btn-group .btn { flex: 1; }

    .json-textarea { font-size: 0.75rem; min-height: 150px; }

    .modal { max-height: 95vh; }
    .modal .json-textarea { min-height: 35vh; font-size: 0.7rem; }

    .prop-label { min-width: 70px; font-size: 0.72rem; }

    .preview-screen { width: 280px; height: 158px; }

    .tree-label { padding: 0.5rem; min-height: 44px; }

    .seo-content { padding: 1rem; }
}

/* Tablet+ */
@media (min-width: 769px) {
    .editor-tabs { display: none; }

    .editor-grid {
        grid-template-columns: 280px 1fr 1fr;
    }

    .panel[data-panel] { display: flex !important; }

    .panel { max-height: 75vh; min-height: 400px; }

    .modal {
        border-radius: var(--radius);
        margin: auto;
    }

    .modal-overlay {
        align-items: center;
        padding: 2rem;
    }
}

/* Large desktop */
@media (min-width: 1100px) {
    .editor-grid {
        grid-template-columns: 300px 340px 1fr;
    }

    .panel { min-height: 500px; }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        transition-duration: 0.01ms !important;
        animation-duration: 0.01ms !important;
    }
}