/* ==================================
   KiDraw — Design System & Styles
   ================================== */

/* --- Design Tokens --- */
:root {
    /* Dark theme colors */
    --bg-primary: #12131a;
    --bg-secondary: #1a1b26;
    --bg-surface: #1e2030;
    --bg-surface-hover: #262840;
    --bg-surface-active: #2e3150;
    --bg-canvas: #ffffff;

    /* Text */
    --text-primary: #e0e0f0;
    --text-secondary: #8888a8;
    --text-muted: #555570;

    /* Accents */
    --accent-primary: #7c6aef;
    --accent-primary-hover: #9080ff;
    --accent-secondary: #e94560;
    --accent-glow: rgba(124, 106, 239, 0.3);

    /* Danger */
    --danger: #e94560;
    --danger-hover: #ff5a78;

    /* Layout */
    --sidebar-width: 64px;
    --topbar-height: 44px;
    --bottombar-height: 36px;
    --border-radius: 8px;
    --border-radius-sm: 5px;

    /* Typography */
    --font-family: 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;

    /* Transitions */
    --transition-fast: 120ms ease;
    --transition-normal: 200ms ease;
    --transition-smooth: 300ms cubic-bezier(0.4, 0, 0.2, 1);

    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 12px var(--accent-glow);
}

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

html, body {
    width: 100%;
    height: 100%;
    overflow: hidden;
    font-family: var(--font-family);
    background: var(--bg-primary);
    color: var(--text-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* --- App Layout Grid --- */
#app {
    display: grid;
    grid-template-rows: var(--topbar-height) 1fr var(--bottombar-height);
    grid-template-columns: var(--sidebar-width) 1fr;
    grid-template-areas:
        "topbar topbar"
        "sidebar canvas"
        "bottombar bottombar";
    width: 100%;
    height: 100%;
}

/* --- Top Bar --- */
#top-bar {
    grid-area: topbar;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 10px;
    background: var(--bg-secondary);
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    z-index: 10;
}

#topbar-left {
    display: flex;
    align-items: center;
    gap: 8px;
}

#topbar-right {
    display: flex;
    align-items: center;
    gap: 4px;
}

.topbar-separator {
    width: 1px;
    height: 20px;
    background: rgba(255, 255, 255, 0.08);
    margin: 0 4px;
}

#drawing-title {
    background: transparent;
    border: 1px solid transparent;
    border-radius: var(--border-radius-sm);
    color: var(--text-primary);
    font-family: var(--font-family);
    font-size: 14px;
    font-weight: 500;
    padding: 4px 8px;
    width: 200px;
    transition: all var(--transition-fast);
}

#drawing-title:hover {
    border-color: rgba(255, 255, 255, 0.1);
}

#drawing-title:focus {
    outline: none;
    border-color: var(--accent-primary);
    background: var(--bg-surface);
}

/* --- Shared Button Styles --- */
.topbar-btn, .sidebar-btn, .bottombar-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: var(--border-radius-sm);
    transition: all var(--transition-fast);
    position: relative;
}

.topbar-btn {
    width: 32px;
    height: 32px;
}

.topbar-btn:hover:not(:disabled) {
    color: var(--text-primary);
    background: var(--bg-surface-hover);
}

.topbar-btn:active:not(:disabled) {
    background: var(--bg-surface-active);
    transform: scale(0.94);
}

.topbar-btn:disabled {
    opacity: 0.3;
    cursor: default;
}

.topbar-btn--danger:hover:not(:disabled) {
    color: var(--danger);
    background: rgba(233, 69, 96, 0.12);
}

/* --- Sidebar --- */
#sidebar {
    grid-area: sidebar;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 8px 0;
    background: var(--bg-secondary);
    border-right: 1px solid rgba(255, 255, 255, 0.06);
    gap: 4px;
    overflow-y: auto;
    overflow-x: hidden;
    z-index: 10;
}

#sidebar::-webkit-scrollbar {
    width: 0;
}

.sidebar-separator {
    width: 36px;
    height: 1px;
    background: rgba(255, 255, 255, 0.08);
    margin: 4px 0;
}

/* Tool buttons */
#tool-buttons {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.tool-btn {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: var(--border-radius);
    transition: all var(--transition-fast);
    font-size: 20px;
    position: relative;
}

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

.tool-btn.active {
    color: var(--accent-primary);
    background: rgba(124, 106, 239, 0.15);
    box-shadow: var(--shadow-glow);
}

.tool-btn.active::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 3px;
    height: 20px;
    background: var(--accent-primary);
    border-radius: 0 2px 2px 0;
}

/* Size control */
#size-control {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    padding: 4px 0;
}

#size-preview-wrapper {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: var(--bg-surface);
}

#size-preview {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--text-primary);
    transition: all var(--transition-fast);
}

#size-slider {
    writing-mode: vertical-lr;
    direction: rtl;
    width: 6px;
    height: 80px;
    appearance: none;
    -webkit-appearance: none;
    background: var(--bg-surface);
    border-radius: 3px;
    outline: none;
    cursor: pointer;
}

#size-slider::-webkit-slider-thumb {
    appearance: none;
    -webkit-appearance: none;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--accent-primary);
    cursor: pointer;
    box-shadow: 0 0 6px var(--accent-glow);
    transition: transform var(--transition-fast);
}

#size-slider::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

#size-slider::-moz-range-thumb {
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--accent-primary);
    cursor: pointer;
    border: none;
}

#size-value {
    font-size: 10px;
    color: var(--text-muted);
    font-weight: 500;
}

/* Quick palette */
#quick-palette {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3px;
    padding: 0 8px;
}

.color-swatch {
    width: 22px;
    height: 22px;
    border-radius: 4px;
    cursor: pointer;
    border: 2px solid transparent;
    transition: all var(--transition-fast);
    position: relative;
    box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.1);
}

.color-swatch:hover {
    transform: scale(1.15);
    z-index: 1;
}

.color-swatch.active {
    border-color: white;
    box-shadow: 0 0 8px rgba(255, 255, 255, 0.3);
    transform: scale(1.1);
}

.sidebar-btn {
    width: 44px;
    height: 36px;
    font-size: 18px;
}

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

/* --- Canvas --- */
#canvas-container {
    grid-area: canvas;
    position: relative;
    overflow: hidden;
    background: var(--bg-primary);
}

#draw-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    touch-action: none;
}

/* Cursor preview */
#cursor-preview {
    position: fixed;
    pointer-events: none;
    border-radius: 50%;
    border: 1.5px solid rgba(124, 106, 239, 0.6);
    transform: translate(-50%, -50%);
    z-index: 100;
    display: none;
    mix-blend-mode: difference;
}

/* --- Bottom Bar --- */
#bottom-bar {
    grid-area: bottombar;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 12px;
    background: var(--bg-secondary);
    border-top: 1px solid rgba(255, 255, 255, 0.06);
    gap: 16px;
    z-index: 10;
}

#zoom-controls, #symmetry-controls, #stabilizer-control, #bottombar-right, #background-controls {
    display: flex;
    align-items: center;
    gap: 4px;
}

.bottombar-btn {
    width: 28px;
    height: 28px;
    font-size: 14px;
}

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

.bottombar-btn:active {
    transform: scale(0.92);
}

.bottombar-btn.active {
    color: var(--accent-primary);
    background: rgba(124, 106, 239, 0.15);
}

#zoom-level {
    font-size: 11px;
    color: var(--text-secondary);
    min-width: 40px;
    text-align: center;
    font-weight: 500;
    user-select: none;
}

#stabilizer-control label,
#stabilizer-control svg {
    color: var(--text-muted);
    font-size: 11px;
}

#stabilizer-slider {
    width: 70px;
    height: 4px;
    appearance: none;
    -webkit-appearance: none;
    background: var(--bg-surface);
    border-radius: 2px;
    cursor: pointer;
    outline: none;
}

#stabilizer-slider::-webkit-slider-thumb {
    appearance: none;
    -webkit-appearance: none;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--text-secondary);
    cursor: pointer;
}

#stabilizer-slider::-moz-range-thumb {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--text-secondary);
    border: none;
    cursor: pointer;
}

/* --- Floating Panels --- */
.floating-panel {
    position: fixed;
    background: var(--bg-secondary);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
    z-index: 200;
    backdrop-filter: blur(20px);
    min-width: 240px;
    animation: panelIn var(--transition-smooth) forwards;
}

.floating-panel.hidden {
    display: none;
}

@keyframes panelIn {
    from {
        opacity: 0;
        transform: scale(0.95) translateY(4px);
    }
    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

.panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 14px;
    font-size: 13px;
    font-weight: 600;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    cursor: move;
    user-select: none;
}

.panel-close {
    width: 22px;
    height: 22px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: 4px;
    font-size: 16px;
    transition: all var(--transition-fast);
}

.panel-close:hover {
    color: var(--text-primary);
    background: var(--bg-surface-hover);
}

.panel-body {
    padding: 12px 14px;
}

/* --- Color Picker Panel --- */
#color-picker-panel {
    top: 80px;
    left: calc(var(--sidebar-width) + 16px);
}

#color-wheel {
    display: block;
    margin: 0 auto 12px;
    cursor: crosshair;
    border-radius: 8px;
}

#color-sliders {
    display: flex;
    flex-direction: column;
    gap: 6px;
    margin-bottom: 10px;
}

.color-slider-row {
    display: flex;
    align-items: center;
    gap: 8px;
}

.color-slider-row label {
    font-size: 11px;
    font-weight: 600;
    color: var(--text-muted);
    width: 12px;
    text-align: center;
}

.color-slider-row input[type="range"] {
    flex: 1;
    height: 4px;
    appearance: none;
    -webkit-appearance: none;
    background: var(--bg-surface);
    border-radius: 2px;
    cursor: pointer;
    outline: none;
}

.color-slider-row input[type="range"]::-webkit-slider-thumb {
    appearance: none;
    -webkit-appearance: none;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--accent-primary);
    cursor: pointer;
}

.color-slider-row input[type="range"]::-moz-range-thumb {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--accent-primary);
    border: none;
    cursor: pointer;
}

.color-slider-row input[type="number"] {
    width: 42px;
    background: var(--bg-surface);
    border: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: 4px;
    color: var(--text-primary);
    font-family: var(--font-family);
    font-size: 11px;
    padding: 2px 4px;
    text-align: center;
    outline: none;
}

.color-slider-row input[type="number"]:focus {
    border-color: var(--accent-primary);
}

/* Hide number input arrows */
.color-slider-row input[type="number"]::-webkit-inner-spin-button,
.color-slider-row input[type="number"]::-webkit-outer-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

.color-slider-row input[type="number"] {
    -moz-appearance: textfield;
}

#hex-row {
    display: flex;
    align-items: center;
    gap: 4px;
    margin-bottom: 10px;
}

#hex-row label {
    font-size: 12px;
    font-weight: 600;
    color: var(--text-muted);
}

#hex-input {
    flex: 1;
    background: var(--bg-surface);
    border: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: 4px;
    color: var(--text-primary);
    font-family: 'Outfit', monospace;
    font-size: 12px;
    padding: 4px 8px;
    outline: none;
    text-transform: uppercase;
    letter-spacing: 1px;
}

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

#color-preview-row {
    display: flex;
    gap: 4px;
    border-radius: 6px;
    overflow: hidden;
}

#color-preview-old, #color-preview-new {
    flex: 1;
    height: 28px;
}

/* --- Modal --- */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 300;
    animation: fadeIn var(--transition-normal) forwards;
}

.modal-overlay.hidden {
    display: none;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.modal-content {
    background: var(--bg-secondary);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 16px;
    box-shadow: var(--shadow-lg);
    padding: 24px;
    min-width: 320px;
    max-width: 420px;
    animation: modalIn var(--transition-smooth) forwards;
}

@keyframes modalIn {
    from {
        opacity: 0;
        transform: scale(0.92) translateY(8px);
    }
    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

.modal-content h3 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 8px;
}

.modal-content p {
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 20px;
    line-height: 1.5;
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 8px;
}

.modal-btn {
    padding: 8px 18px;
    border: none;
    border-radius: var(--border-radius);
    font-family: var(--font-family);
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.modal-btn--cancel {
    background: var(--bg-surface);
    color: var(--text-secondary);
}

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

.modal-btn--danger {
    background: var(--danger);
    color: white;
}

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

.modal-btn--primary {
    background: var(--accent-primary);
    color: white;
}

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

/* --- Gallery --- */
.gallery-panel {
    background: var(--bg-secondary);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 16px;
    box-shadow: var(--shadow-lg);
    width: 90vw;
    max-width: 800px;
    max-height: 80vh;
    display: flex;
    flex-direction: column;
    animation: modalIn var(--transition-smooth) forwards;
}

#gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 16px;
    padding: 16px;
    overflow-y: auto;
}

.gallery-card {
    background: var(--bg-surface);
    border-radius: 12px;
    overflow: hidden;
    cursor: pointer;
    transition: all var(--transition-normal);
    border: 1px solid rgba(255, 255, 255, 0.04);
}

.gallery-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
    border-color: rgba(255, 255, 255, 0.1);
}

.gallery-card-thumb {
    width: 100%;
    aspect-ratio: 4/3;
    background: white;
    background-size: contain;
    background-position: center;
    background-repeat: no-repeat;
}

.gallery-card-info {
    padding: 10px 12px;
}

.gallery-card-name {
    font-size: 13px;
    font-weight: 500;
    margin-bottom: 4px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.gallery-card-date {
    font-size: 11px;
    color: var(--text-muted);
}

.gallery-card-actions {
    display: flex;
    justify-content: flex-end;
    padding: 0 8px 8px;
}

.gallery-card-delete {
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    border-radius: 4px;
    font-size: 14px;
    transition: all var(--transition-fast);
}

.gallery-card-delete:hover {
    color: var(--danger);
    background: rgba(233, 69, 96, 0.12);
}

.gallery-card--new {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: 8px;
    border: 2px dashed rgba(255, 255, 255, 0.1);
    background: transparent;
    min-height: 180px;
}

.gallery-card--new:hover {
    border-color: var(--accent-primary);
    background: rgba(124, 106, 239, 0.05);
}

.gallery-card--new svg {
    color: var(--text-muted);
    transition: color var(--transition-fast);
}

.gallery-card--new:hover svg {
    color: var(--accent-primary);
}

.gallery-card--new span {
    font-size: 13px;
    color: var(--text-muted);
}

/* --- Shortcuts Panel --- */
#shortcuts-panel {
    top: auto;
    bottom: 50px;
    right: 16px;
}

.shortcuts-body {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.shortcut-row {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 12px;
    color: var(--text-secondary);
}

.shortcut-row span {
    margin-left: auto;
    color: var(--text-muted);
}

kbd {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 22px;
    height: 20px;
    padding: 0 5px;
    background: var(--bg-surface);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 4px;
    font-family: var(--font-family);
    font-size: 10px;
    font-weight: 500;
    color: var(--text-primary);
}

/* --- Toast --- */
.toast {
    position: fixed;
    bottom: 56px;
    left: 50%;
    transform: translateX(-50%) translateY(20px);
    background: var(--bg-surface);
    color: var(--text-primary);
    padding: 8px 20px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 500;
    box-shadow: var(--shadow-md);
    border: 1px solid rgba(255, 255, 255, 0.08);
    z-index: 400;
    opacity: 0;
    transition: all var(--transition-smooth);
    pointer-events: none;
}

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

.toast.hidden {
    display: block;
}

/* --- Background grid patterns rendered on canvas, no CSS needed --- */

/* --- Responsive adjustments --- */
@media (max-width: 600px) {
    :root {
        --sidebar-width: 52px;
        --topbar-height: 40px;
    }

    #drawing-title {
        width: 120px;
        font-size: 13px;
    }

    .tool-btn {
        width: 38px;
        height: 38px;
        font-size: 17px;
    }

    .color-swatch {
        width: 18px;
        height: 18px;
    }

    #stabilizer-control {
        display: none;
    }
}