:root {
    --primary-color: #0f766e;
    --primary-hover: #0b5b56;
    --accent-color: #f59e0b;
    --bg-color: #fdf6ec;
    --surface-color: rgba(255, 255, 255, 0.92);
    --border-color: rgba(15, 118, 110, 0.2);
    --text-primary: #1f2933;
    --text-secondary: #6b7280;
    --text-muted: #9ca3af;
    --shadow: 0 20px 40px rgba(15, 23, 42, 0.12);
    --radius: 16px;
    --font-body: "Trebuchet MS", "Verdana", sans-serif;
    --font-display: "Georgia", "Times New Roman", serif;
    --font-mono: "Courier New", monospace;
}

@media (prefers-color-scheme: dark) {
    :root {
        --primary-color: #2dd4bf;
        --primary-hover: #22c7b6;
        --accent-color: #fbbf24;
        --bg-color: #0f172a;
        --surface-color: rgba(15, 23, 42, 0.9);
        --border-color: rgba(148, 163, 184, 0.25);
        --text-primary: #f8fafc;
        --text-secondary: #cbd5f5;
        --text-muted: #94a3b8;
        --shadow: 0 24px 48px rgba(0, 0, 0, 0.4);
    }
}

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

body {
    font-family: var(--font-body);
    background: radial-gradient(circle at 12% 18%, rgba(15, 118, 110, 0.14), transparent 40%),
        radial-gradient(circle at 80% 12%, rgba(245, 158, 11, 0.15), transparent 45%),
        var(--bg-color);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
}

.container {
    width: 100%;
    max-width: 1000px;
}

header {
    text-align: center;
    margin-bottom: 2rem;
}

header h1 {
    font-family: var(--font-display);
    font-size: clamp(2rem, 3vw, 2.6rem);
    margin-bottom: 0.6rem;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.layout {
    display: grid;
    gap: 1.5rem;
}

.panel {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 1.5rem;
    box-shadow: var(--shadow);
}

.panel-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    margin-bottom: 1rem;
}

.panel-head h2 {
    font-family: var(--font-display);
    font-size: 1.25rem;
}

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

.status {
    font-size: 0.9rem;
    color: var(--text-secondary);
}
.status[data-type="success"] {
    color: #10b981;
}

.status[data-type="error"] {
    color: #ef4444;
}

.toolbar {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-bottom: 1rem;
    padding: 0.75rem 1rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    background: var(--surface-color);
}

.toolbar-group {
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem;
    align-items: center;
}

.toolbar-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 600;
    margin-right: 0.4rem;
}

.toggle {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 600;
}

.toggle input {
    position: absolute;
    opacity: 0;
    pointer-events: none;
}

.toggle-track {
    width: 40px;
    height: 22px;
    background: var(--border-color);
    border-radius: 999px;
    position: relative;
    transition: background 0.2s ease;
}

.toggle-track::after {
    content: "";
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: #fff;
    position: absolute;
    top: 3px;
    left: 3px;
    transition: transform 0.2s ease;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.15);
}

.toggle input:checked + .toggle-track {
    background: var(--primary-color);
}

.toggle input:checked + .toggle-track::after {
    transform: translateX(18px);
}

.toggle input:focus-visible + .toggle-track {
    box-shadow: 0 0 0 3px rgba(15, 118, 110, 0.25);
}

.chip {
    border: 1px solid var(--border-color);
    background: rgba(255, 255, 255, 0.7);
    color: var(--text-primary);
    border-radius: 999px;
    padding: 0.35rem 0.9rem;
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.2s ease;
    font-weight: 600;
}

.chip:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    transform: translateY(-1px);
}

textarea {
    width: 100%;
    padding: 1rem;
    border: 1.5px solid var(--border-color);
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.6);
    color: inherit;
    font-family: var(--font-mono);
    font-size: 1rem;
    line-height: 1.7;
    resize: vertical;
    min-height: 150px;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(15, 118, 110, 0.2);
}

.settings-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 1rem;
    margin-top: 1.25rem;
}

.settings-grid label {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 600;
}

.settings-grid label.disabled {
    opacity: 0.6;
}

.settings-grid input[type="number"],
.settings-grid input[type="color"],
.settings-grid select {
    padding: 0.6rem 0.7rem;
    border-radius: 10px;
    border: 1px solid var(--border-color);
    background: rgba(255, 255, 255, 0.75);
    color: var(--text-primary);
    font-family: inherit;
}

.settings-grid .toggle {
    flex-direction: row;
    align-items: center;
    gap: 0.6rem;
}

.settings-grid .toggle input {
    width: auto;
    position: static;
    opacity: 1;
}

.meta-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    margin-top: 0.75rem;
    flex-wrap: wrap;
}

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

.meta-pill {
    padding: 0.25rem 0.7rem;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.7);
    border: 1px solid var(--border-color);
    font-size: 0.75rem;
    color: var(--text-secondary);
    font-weight: 600;
}

.row {
    display: flex;
    gap: 0.8rem;
    margin-top: 1.5rem;
    flex-wrap: wrap;
}

.btn {
    padding: 0.75rem 1.4rem;
    border: none;
    border-radius: 999px;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    background: var(--primary-color);
    color: white;
    box-shadow: 0 10px 20px rgba(15, 118, 110, 0.25);
    transition: transform 0.2s ease, background 0.2s ease;
}

.btn:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
}

.btn-ghost {
    background: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    box-shadow: none;
}

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

.btn-small {
    padding: 0.4rem 0.9rem;
    font-size: 0.8rem;
}

.actions {
    align-items: center;
}

.history {
    margin-top: 1.5rem;
    padding-top: 1rem;
    border-top: 1px dashed var(--border-color);
}

.history-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    margin-bottom: 0.75rem;
}

.history-head h3 {
    font-family: var(--font-display);
    font-size: 1rem;
    margin: 0;
}

.history-list {
    display: grid;
    gap: 0.6rem;
}

.history-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    padding: 0.65rem 0.8rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    background: rgba(255, 255, 255, 0.7);
    font-family: var(--font-mono);
    font-size: 0.85rem;
    transition: background 0.2s ease, border-color 0.2s ease, transform 0.15s ease;
}

.history-item:hover {
    background: rgba(255, 255, 255, 0.95);
    border-color: var(--primary-color);
    transform: translateX(4px);
}

.history-text {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.history-item button {
    flex-shrink: 0;
}

.history-empty {
    color: var(--text-muted);
    font-size: 0.9rem;
    padding: 0.5rem 0;
}

.output {
    min-height: 200px;
    border-radius: 16px;
    border: 1px solid var(--border-color);
    background: rgba(255, 255, 255, 0.6);
    padding: 16px;
    overflow-x: auto;
}

.output.transparent {
    background-image: linear-gradient(45deg, rgba(148, 163, 184, 0.2) 25%, transparent 25%),
        linear-gradient(-45deg, rgba(148, 163, 184, 0.2) 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, rgba(148, 163, 184, 0.2) 75%),
        linear-gradient(-45deg, transparent 75%, rgba(148, 163, 184, 0.2) 75%);
    background-size: 16px 16px;
    background-position: 0 0, 0 8px, 8px -8px, -8px 0;
}

@media (max-width: 720px) {
    body {
        padding: 16px;
    }

    .panel-head {
        flex-direction: column;
        align-items: flex-start;
    }
}

@media (max-width: 480px) {
    body {
        padding: 8px;
    }

    .output {
        padding: 12px;
    }

    textarea {
        min-height: 80px;
    }

    .btn {
        min-height: 44px;
    }
}

.layout > .panel + .panel {
    border-top: 3px solid var(--primary-color);
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(6px); }
    to { opacity: 1; transform: translateY(0); }
}

.fade-in {
    animation: fadeIn 0.3s ease both;
}

.empty-state {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 120px;
    color: var(--text-muted);
    font-size: 1rem;
    text-align: center;
}

/* Extended symbols toolbar */
.toolbar-expand {
    display: flex;
    justify-content: center;
}

#more-symbols-btn {
    font-size: 0.8rem;
    padding: 0.3rem 1rem;
}

.extended-symbols {
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
    overflow: hidden;
    transition: max-height 0.3s ease, opacity 0.3s ease;
}

.extended-symbols[hidden] {
    display: none;
}

.extended-symbols.collapsing {
    max-height: 0;
    opacity: 0;
}

.extended-symbols.expanded {
    max-height: 500px;
    opacity: 1;
}

.symbol-row {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    align-items: center;
    padding: 0.25rem 0;
}

.chip-symbol {
    min-width: 36px;
    padding: 0.3rem 0.6rem;
    font-size: 1rem;
    text-align: center;
}

/* Favorites panel */
.favorites {
    margin-top: 1.25rem;
    padding-top: 1rem;
    border-top: 1px dashed var(--border-color);
}

.favorites-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    margin-bottom: 0.75rem;
    cursor: pointer;
}

.favorites-head h3 {
    font-family: var(--font-display);
    font-size: 1rem;
    margin: 0;
}

.favorites-list {
    display: grid;
    gap: 0.6rem;
    transition: max-height 0.3s ease, opacity 0.3s ease;
    overflow: hidden;
}

.favorites-list.collapsed {
    max-height: 0;
    opacity: 0;
    margin: 0;
}

.fav-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.65rem 0.8rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    background: rgba(255, 255, 255, 0.7);
    cursor: pointer;
    transition: background 0.2s ease, border-color 0.2s ease, transform 0.15s ease;
}

.fav-item:hover {
    background: rgba(255, 255, 255, 0.95);
    border-color: var(--primary-color);
    transform: translateX(4px);
}

.fav-item:active {
    transform: scale(0.98);
}

.fav-text {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    font-family: var(--font-mono);
    font-size: 0.85rem;
}

.fav-preview {
    flex-shrink: 0;
    max-width: 120px;
    max-height: 40px;
    overflow: hidden;
    font-size: 14px;
}

.fav-empty {
    color: var(--text-muted);
    font-size: 0.9rem;
    padding: 0.5rem 0;
}

#fav-btn {
    font-size: 1.2rem;
    padding: 0.6rem 0.9rem;
    line-height: 1;
    color: var(--accent-color);
    border-color: var(--accent-color);
}

#fav-btn:hover {
    background: rgba(245, 158, 11, 0.12);
    transform: translateY(-1px);
}

/* Zoom controls */
.preview-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    margin-bottom: 1rem;
}

.preview-head h2 {
    font-family: var(--font-display);
    font-size: 1.25rem;
}

.zoom-controls {
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.zoom-controls .btn {
    padding: 0.3rem 0.7rem;
    font-size: 0.85rem;
    min-width: 32px;
    text-align: center;
}

#zoom-level {
    min-width: 48px;
    text-align: center;
    font-variant-numeric: tabular-nums;
}

.output.zoomed {
    overflow: auto;
    max-height: 60vh;
}

/* Resize handle */
.resize-handle {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 20px;
    cursor: row-resize;
    color: var(--text-muted);
    font-size: 1.2rem;
    letter-spacing: 4px;
    user-select: none;
    touch-action: none;
    border-radius: 4px;
    transition: background 0.2s ease, color 0.2s ease;
}

.resize-handle:hover {
    background: var(--border-color);
    color: var(--primary-color);
}

/* Enhanced interactive states */
.btn:active {
    transform: scale(0.97);
}

.btn-ghost:active {
    background: rgba(15, 118, 110, 0.08);
}

.chip:active {
    transform: scale(0.95);
}

/* Dark mode adjustments */
@media (prefers-color-scheme: dark) {
    .chip {
        background: rgba(30, 41, 59, 0.7);
    }

    .chip:hover {
        background: rgba(45, 212, 191, 0.12);
    }

    .fav-item,
    .history-item {
        background: rgba(30, 41, 59, 0.7);
    }

    .fav-item:hover,
    .history-item:hover {
        background: rgba(45, 212, 191, 0.12);
    }

    #fav-btn {
        color: var(--accent-color);
        border-color: var(--accent-color);
    }
}