/* CSS Variables for theming */
:root {
    --bg-primary: #e8e8e8;
    --bg-secondary: #f5f5f5;
    --text-primary: #2c2c2c;
    --text-secondary: #555555;
    --border-color: #cccccc;
    --border-strong: #b5b5b5;
    --shadow: rgba(0, 0, 0, 0.1);
    --accent: #6b6b6b;
    --accent-hover: #555555;
    --canvas-bg: #ffffff;
    --paper-bg: #fdf6e3;
    --panel-surface: #f9f9f9;
    --panel-surface-strong: #ededed;
    --panel-glow: rgba(255, 255, 255, 0.45);
    --panel-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
}

[data-theme="dark"] {
    --bg-primary: #1a1a1a;
    --bg-secondary: #2c2c2c;
    --text-primary: #cccccc;
    --text-secondary: #888888;
    --border-color: #3a3a3a;
    --border-strong: #4a4a4a;
    --shadow: rgba(0, 0, 0, 0.3);
    --accent: #6b6b6b;
    --accent-hover: #888888;
    --canvas-bg: #ffffff;
    --paper-bg: #fdf6e3;
    --panel-surface: #262626;
    --panel-surface-strong: #2f2f2f;
    --panel-glow: rgba(255, 255, 255, 0.05);
    --panel-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
}

/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html, body {
    width: 100%;
    height: 100%;
    overflow: hidden;
    overscroll-behavior: none;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    -webkit-tap-highlight-color: transparent;
}

/* Walkthrough Modal */
.walkthrough-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(8px);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 32px;
    opacity: 1;
    animation: fadeIn 0.3s ease-out;
}

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

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

.walkthrough-content {
    background-color: transparent;
    background-image: url('walkthrough/gran-1600.jpg');
    background-position: center;
    background-size: cover;
    background-repeat: no-repeat;
    border-radius: 18px;
    padding: 32px;
    width: min(1100px, calc(100% - 64px));
    height: auto;
    max-width: 1100px;
    max-height: calc(100vh - 120px);
    overflow-y: auto;
    box-shadow: 0 18px 50px rgba(0, 0, 0, 0.45);
    animation: slideUp 0.4s ease-out;
    position: relative;
}

.walkthrough-content::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: 18px;
    background: linear-gradient(180deg, rgba(20, 20, 20, 0.45), rgba(20, 20, 20, 0.8));
    pointer-events: none;
}

.walkthrough-content > * {
    position: relative;
    z-index: 1;
}

@keyframes slideUp {
    from {
        transform: translateY(30px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.walkthrough-close {
    position: absolute;
    top: 16px;
    right: 16px;
    background: transparent;
    border: none;
    font-size: 32px;
    color: var(--text-secondary);
    cursor: pointer;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: all 0.2s ease;
}

.walkthrough-close:hover {
    background: var(--border-color);
    color: var(--text-primary);
}

.walkthrough-slide {
    display: none;
    animation: slideIn 0.4s ease-out;
}

.walkthrough-slide.active {
    display: block;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.walkthrough-header {
    text-align: center;
    margin-bottom: 24px;
    padding-bottom: 16px;
    border-bottom: 2px solid rgba(255, 255, 255, 0.25);
}

.walkthrough-logo {
    width: 80px;
    height: 80px;
    margin: 0 auto 16px;
    display: block;
    border-radius: 12px;
}

.walkthrough-header h1 {
    font-size: 32px;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.walkthrough-subtitle {
    font-size: 14px;
    color: var(--text-secondary);
    font-weight: 500;
}

.walkthrough-body {
    min-height: 300px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.walkthrough-image {
    width: 100%;
    max-width: 400px;
    margin-bottom: 20px;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.walkthrough-image img {
    width: 100%;
    height: auto;
    display: block;
}

.walkthrough-body h2 {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-primary);
    text-align: center;
}

.walkthrough-body p {
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-secondary);
    margin-bottom: 12px;
    text-align: center;
}

/* Walkthrough welcome slide text contrast */
.walkthrough-content .walkthrough-header h1,
.walkthrough-content .walkthrough-subtitle,
.walkthrough-content .walkthrough-body h2,
.walkthrough-content .walkthrough-body p {
    color: #f5f5f5;
    text-shadow: 0 2px 6px rgba(0, 0, 0, 0.45);
}

.walkthrough-navigation {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: 24px;
    padding-top: 16px;
    border-top: 2px solid rgba(255, 255, 255, 0.25);
}

.walkthrough-nav-btn {
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    background: var(--accent);
    color: white;
    transition: all 0.2s ease;
}

.walkthrough-nav-btn:hover {
    background: var(--accent-hover);
}

.walkthrough-nav-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.walkthrough-nav-btn.primary {
    background: #5a8dee;
}

.walkthrough-nav-btn.primary:hover {
    background: #4a7dde;
}

.walkthrough-dots {
    display: flex;
    gap: 8px;
    align-items: center;
}

.walkthrough-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--border-color);
    cursor: pointer;
    transition: all 0.2s ease;
}

.walkthrough-dot:hover {
    background: var(--accent);
}

.walkthrough-dot.active {
    background: #5a8dee;
    width: 12px;
    height: 12px;
}

.walkthrough-footer {
    margin-top: 16px;
    text-align: center;
}

/* Mobile responsiveness */
@media (max-width: 600px) {
    .walkthrough-content {
        padding: 20px;
        max-height: 95vh;
        max-width: 100%;
        height: auto;
    }
    
    .walkthrough-header h1 {
        font-size: 24px;
    }
    
    .walkthrough-body h2 {
        font-size: 20px;
    }
    
    .walkthrough-body p {
        font-size: 14px;
    }

    .walkthrough-body {
        min-height: auto;
    }
    
    .walkthrough-nav-btn {
        padding: 8px 16px;
        font-size: 12px;
    }
    
    .walkthrough-image {
        max-width: 100%;
    }
}

/* Advanced Color Panel */
.advanced-backdrop {
    display: none;
}

.advanced-panel {
    position: fixed;
    top: 0;
    left: 0;
    width: 380px;
    max-width: 100%;
    height: 100%;
    background: linear-gradient(165deg, var(--bg-secondary) 0%, var(--panel-surface) 55%, var(--bg-secondary) 100%);
    box-shadow: 12px 0 30px rgba(0, 0, 0, 0.3);
    border-right: 1px solid var(--border-strong);
    z-index: 1000;
    padding: 20px 20px 24px;
    display: flex;
    flex-direction: column;
    gap: 16px;
    min-height: 0;
    overflow: hidden;
    transform: translateX(-100%);
    transition: transform 0.3s ease, opacity 0.3s ease, box-shadow 0.3s ease;
    opacity: 0;
}

.advanced-panel.show {
    transform: translateX(0);
    opacity: 1;
}

@media (min-width: 1200px) {
    .advanced-panel {
        width: 420px;
    }

    .inspector-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }
}

.advanced-panel.hidden,
.advanced-backdrop.hidden {
    display: none;
}

.advanced-panel-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 12px;
}

.panel-kicker {
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-size: 12px;
    color: var(--text-secondary);
    margin-bottom: 4px;
}

.advanced-panel-header h3 {
    font-size: 20px;
    color: var(--text-primary);
}

.advanced-panel-body {
    display: flex;
    flex-direction: column;
    gap: 16px;
    flex: 1;
    min-height: 0;
    overflow-y: auto;
    padding-right: 4px;
}

.advanced-panel-body > .slider-group,
.advanced-panel-body > .palette-section,
.advanced-panel-body > .inspector-section,
.advanced-panel-body > .harmony-section,
.advanced-panel-body > .palette-manager,
.advanced-panel-body > .gradient-builder,
.advanced-panel-body > .image-extract,
.advanced-panel-body > .current-color-row {
    background: var(--panel-surface);
    border: 1px solid var(--border-strong);
    border-radius: 12px;
    box-shadow: var(--panel-shadow);
    padding: 12px 12px 14px;
}

.advanced-panel-body > .current-color-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
}

.color-wheel-wrapper {
    position: relative;
    width: 100%;
    aspect-ratio: 1 / 1;
    max-width: 280px;
    align-self: center;
}

#color-wheel-canvas {
    width: 100%;
    height: 100%;
    border-radius: 16px;
    border: 1px solid var(--border-color);
    box-shadow: 0 4px 18px var(--shadow);
}

.color-wheel-indicator {
    position: absolute;
    width: 16px;
    height: 16px;
    border: 2px solid #fff;
    border-radius: 50%;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.35);
    transform: translate(-50%, -50%);
    pointer-events: none;
}

.slider-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 6px;
    color: var(--text-primary);
}

.slider-row {
    display: flex;
    align-items: center;
    gap: 10px;
}

#lightness-slider {
    flex: 1;
}

.slider-value {
    min-width: 40px;
    text-align: right;
    color: var(--text-secondary);
}

.palette-section {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.palette-manager {
    display: flex;
    flex-direction: column;
    gap: 10px;
    position: sticky;
    top: 8px;
    z-index: 2;
    order: -1;
}

.palette-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: 8px;
}

.palette-header h4 {
    font-size: 15px;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: var(--text-primary);
}

.palette-note {
    font-size: 12px;
    color: var(--text-secondary);
}

.gradient-swatches {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(80px, 1fr));
    gap: 10px;
}

.gradient-swatch {
    height: 40px;
    border-radius: 10px;
    border: 1px solid var(--border-strong);
    box-shadow: 0 6px 12px var(--shadow);
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.gradient-swatch:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 18px var(--shadow);
    border-color: var(--accent);
}

.current-color-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    padding: 10px 12px;
    border: 1px solid var(--border-color);
    border-radius: 10px;
    background: var(--bg-primary);
}

.color-chip {
    width: 34px;
    height: 34px;
    border-radius: 8px;
    border: 2px solid var(--border-strong);
    box-shadow: inset 0 0 0 1px rgba(0,0,0,0.15), 0 6px 12px var(--shadow);
}

.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border-color);
}

.inspector-actions {
    display: flex;
    gap: 8px;
}

.section-header h4 {
    font-size: 14px;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-primary);
}

.inspector-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px;
}

.inspector-grid label {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
    padding: 10px 10px 9px;
    border: 1px solid var(--border-strong);
    border-radius: 10px;
    background: var(--panel-surface-strong);
    color: var(--text-primary);
    font-size: 12px;
    box-shadow: 0 4px 12px var(--shadow);
}

.inspector-grid input {
    width: 100%;
    padding: 8px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-weight: 600;
}

.mini-btn {
    padding: 6px 10px;
    border-radius: 8px;
    border: 1px solid var(--border-strong);
    background: linear-gradient(180deg, var(--panel-surface) 0%, var(--bg-primary) 100%);
    color: var(--text-primary);
    cursor: pointer;
    font-weight: 700;
    letter-spacing: 0.01em;
    transition: all 0.2s ease;
    box-shadow: 0 4px 10px var(--shadow);
}

.mini-btn:hover {
    background: var(--panel-surface-strong);
    border-color: var(--accent);
    transform: translateY(-1px);
}

.swatch-row {
    display: flex;
    flex-wrap: nowrap;
    gap: 8px;
    overflow-x: auto;
    padding-bottom: 4px;
}

.swatch-row .swatch,
.swatch-list .swatch {
    width: 32px;
    height: 32px;
    border-radius: 6px;
    border: 2px solid var(--border-color);
    cursor: pointer;
    box-shadow: 0 2px 6px var(--shadow);
}

.palette-manager .swatch-list {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    overflow: visible;
    padding-bottom: 6px;
}

.palette-swatch-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    padding: 8px 10px;
    border: 1px solid var(--border-strong);
    border-radius: 10px;
    background: linear-gradient(180deg, var(--panel-surface) 0%, var(--bg-primary) 100%);
    min-width: 88px;
    box-shadow: 0 6px 14px var(--shadow);
}

.palette-swatch-controls {
    display: flex;
    gap: 4px;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.15s ease;
}

.palette-swatch-item:hover .palette-swatch-controls,
.palette-swatch-item:focus-within .palette-swatch-controls {
    opacity: 1;
    pointer-events: auto;
}

.palette-save-row,
.palette-load-row,
.palette-io-row {
    display: flex;
    gap: 8px;
    align-items: center;
}

.palette-save-row input,
.palette-load-row select {
    flex: 1;
    padding: 8px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background: var(--bg-primary);
    color: var(--text-primary);
}

.recent-row h5 {
    margin-bottom: 6px;
    color: var(--text-primary);
}

.gradient-builder {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.gradient-stop-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.gradient-stop-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 12px;
    border: 1px solid var(--border-strong);
    border-radius: 10px;
    background: var(--panel-surface);
    box-shadow: 0 6px 14px var(--shadow);
}

.gradient-stop-item input[type="range"] {
    flex: 1;
    pointer-events: auto;
    -webkit-appearance: none;
    appearance: none;
    height: 10px;
    background: transparent;
}

.gradient-stop-item input[type="range"]::-webkit-slider-runnable-track {
    height: 4px;
    background: var(--border-strong);
    border-radius: 999px;
}

.gradient-stop-item input[type="range"]::-moz-range-track {
    height: 4px;
    background: var(--border-strong);
    border-radius: 999px;
}

.gradient-stop-item input[type="range"]::-webkit-slider-thumb,
.gradient-stop-item input[type="range"]::-moz-range-thumb {
    pointer-events: auto;
    -webkit-appearance: none;
    appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--text-primary);
    border: 2px solid var(--bg-primary);
    box-shadow: 0 2px 6px var(--shadow);
    margin-top: -6px;
}

.gradient-stop-color {
    width: 28px;
    height: 28px;
    border-radius: 6px;
    border: 2px solid var(--border-color);
    box-shadow: 0 2px 6px var(--shadow);
}

.gradient-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.image-extract .extract-controls {
    display: flex;
    align-items: center;
    gap: 8px;
}

.image-extract select,
.harmony-section select,
.gradient-builder select {
    padding: 8px 10px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background: var(--bg-primary);
    color: var(--text-primary);
}

.swatch-list .swatch-button {
    width: 32px;
    height: 32px;
    border: 2px solid var(--border-strong);
    border-radius: 8px;
    cursor: pointer;
    box-shadow: 0 6px 12px var(--shadow);
    transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
}

.swatch-list .swatch-button:hover,
.swatch-row .swatch-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 18px var(--shadow);
    border-color: var(--accent);
}

@media (max-width: 720px) {
    .advanced-panel {
        width: 100%;
    }

    /* Mobile-friendly Advanced tab improvements */
    .inspector-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .inspector-grid label {
        padding: 10px;
        font-size: 14px;
    }

    .inspector-grid input {
        width: 100%;
        padding: 8px;
        font-size: 14px;
    }

    .section-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }

    .section-header h4 {
        font-size: 16px;
    }

    .inspector-actions,
    .palette-actions {
        width: 100%;
        justify-content: stretch;
    }

    .inspector-actions .mini-btn,
    .palette-actions .mini-btn {
        flex: 1;
        padding: 10px;
        font-size: 14px;
        min-height: 44px;
    }

    .mini-btn {
        padding: 10px 12px;
        font-size: 14px;
        min-height: 44px;
    }

    .harmony-section select,
    .gradient-builder select,
    .image-extract select {
        padding: 10px;
        font-size: 14px;
        min-height: 44px;
    }

    .palette-save-row input,
    .palette-load-row select {
        padding: 10px;
        font-size: 14px;
        min-height: 44px;
    }

    .gradient-actions {
        flex-direction: column;
    }

    .gradient-actions .mini-btn,
    .gradient-actions .secondary-btn {
        width: 100%;
        padding: 12px;
        font-size: 14px;
    }

    .image-extract .extract-controls {
        flex-wrap: wrap;
    }

    .image-extract .extract-controls label,
    .image-extract .extract-controls select {
        font-size: 14px;
    }

    .palette-io-row {
        flex-direction: column;
    }

    .palette-io-row .mini-btn {
        width: 100%;
    }
}

.primary-btn, .secondary-btn {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    min-height: 48px;
}

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

.primary-btn:hover {
    background: var(--accent-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(90, 141, 238, 0.3);
}

.secondary-btn {
    background: var(--bg-primary);
    color: var(--text-primary);
    border: 2px solid var(--border-color);
}

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

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    color: #555555;
    cursor: pointer;
    user-select: none;
}

[data-theme="dark"] .checkbox-label {
    color: #888888;
}

.checkbox-label input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
}

/* Main App */
#app {
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    position: relative;
}

/* Menu Toggle Button (Hamburger) */
.menu-toggle {
    position: fixed;
    top: 12px;
    left: 12px;
    width: 44px;
    height: 44px;
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    z-index: 100;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 5px;
    padding: 8px;
    box-shadow: 0 2px 8px var(--shadow);
    transition: all 0.3s ease;
}

.color-wheel-toggle {
    position: fixed;
    top: 12px;
    left: 64px;
    right: auto;
    width: 44px;
    height: 44px;
    background: linear-gradient(135deg, #ff8a00, #e52e71, #5a8dee);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    cursor: pointer;
    z-index: 100;
    display: grid;
    place-items: center;
    box-shadow: 0 2px 8px var(--shadow);
    transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.color-wheel-toggle:hover {
    transform: scale(1.06);
    box-shadow: 0 4px 12px var(--shadow);
}

.color-wheel-toggle:active {
    transform: scale(0.95);
}

.color-wheel-icon {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: conic-gradient(#ff5f6d, #ffc371, #00c6ff, #7f5a83, #ff5f6d);
    box-shadow: inset 0 0 0 2px rgba(0, 0, 0, 0.2);
}

.menu-toggle:hover {
    background: var(--border-color);
    transform: scale(1.05);
}

.menu-toggle:active {
    transform: scale(0.95);
}

.hamburger-line {
    width: 24px;
    height: 3px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: all 0.3s ease;
}

/* Hamburger animation when menu is collapsed */
.menu-collapsed .menu-toggle .hamburger-line:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
}

.menu-collapsed .menu-toggle .hamburger-line:nth-child(2) {
    opacity: 0;
}

.menu-collapsed .menu-toggle .hamburger-line:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
}

/* Navbar */
.navbar {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: 12px 16px;
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    align-items: center;
    box-shadow: 0 2px 8px var(--shadow);
    z-index: 10;
    transition: transform 0.3s ease, opacity 0.3s ease;
}

/* Navbar collapsed state */
.menu-collapsed .navbar {
    transform: translateY(-200%);
    opacity: 0;
    pointer-events: none;
    display: none;
}

.nav-section {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.nav-section label {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
    white-space: nowrap;
}

.colors-section {
    flex: 1;
    min-width: 200px;
    margin-left: auto;
    justify-content: flex-end;
}

.color-swatches {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
    margin-left: auto;
}

.preset-swatches {
    display: none;
}

.palette-inline-group {
    display: flex;
    align-items: center;
    gap: 6px;
    margin-left: 8px;
    padding-left: 10px;
    border-left: 1px solid var(--border-color);
}

.palette-inline {
    flex-wrap: wrap;
    gap: 6px;
    margin-left: 0;
}

.palette-inline-label {
    font-size: 12px;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--text-secondary);
}

.hidden-inline {
    display: none;
}

.palette-inline-swatch {
    width: 28px;
    height: 28px;
    border: 2px solid var(--border-strong);
    border-radius: 8px;
    box-shadow: 0 3px 8px var(--shadow);
    cursor: pointer;
    background: var(--bg-primary);
}

.palette-inline-swatch.active {
    box-shadow: 0 0 0 2px var(--bg-secondary), 0 0 0 4px var(--accent), 0 6px 12px var(--shadow);
}

.color-swatch {
    width: 32px;
    height: 32px;
    border-radius: 6px;
    border: 2px solid transparent;
    cursor: pointer;
    transition: all 0.2s ease;
}

.color-swatch:hover {
    transform: scale(1.1);
    box-shadow: 0 2px 8px var(--shadow);
}

.color-swatch.active {
    border-color: var(--accent);
    box-shadow: 0 0 0 2px var(--bg-secondary), 0 0 0 4px var(--accent);
}

#custom-color {
    width: 32px;
    height: 32px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    background: none;
}

#pen-size {
    width: 100px;
    cursor: pointer;
}

#pen-size-value {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    min-width: 24px;
    text-align: center;
}

#brush-texture {
    padding: 6px 12px;
    border-radius: 6px;
    border: 1px solid var(--border-color);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 14px;
    cursor: pointer;
    min-height: 36px;
}

.actions-section {
    gap: 8px;
}

.settings-section {
    margin-left: auto;
}

.zoom-section {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 4px 8px;
    background: var(--bg-primary);
    border-radius: 6px;
    border: 1px solid var(--border-color);
}

#zoom-level {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-primary);
    min-width: 45px;
    text-align: center;
}

.tool-btn {
    padding: 8px 16px;
    border-radius: 6px;
    border: 1px solid var(--border-color);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    min-height: 36px;
    white-space: nowrap;
}

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

.tool-btn:active {
    transform: translateY(0);
}

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

.tool-btn.primary:hover {
    background: var(--accent-hover);
}

.tool-btn.active {
    background: var(--accent);
    color: white;
    border-color: var(--accent);
}

.checkbox-label.small {
    font-size: 13px;
}

.checkbox-label.small input[type="checkbox"] {
    width: 16px;
    height: 16px;
}

/* Canvas Container */
#canvas-container {
    flex: 1;
    position: relative;
    overflow: hidden;
    background: var(--canvas-bg);
    touch-action: none;
    user-select: none;
    -webkit-user-select: none;
    -webkit-touch-callout: none;
}

/* Background canvas - bottom layer */
#bgCanvas {
    display: block;
    position: absolute;
    top: 0;
    left: 0;
    touch-action: none;
    user-select: none;
    -webkit-user-select: none;
    -webkit-touch-callout: none;
    z-index: 1;
}

/* Drawing canvas - middle layer */
#drawCanvas {
    display: block;
    position: absolute;
    top: 0;
    left: 0;
    touch-action: none;
    cursor: crosshair;
    user-select: none;
    -webkit-user-select: none;
    -webkit-touch-callout: none;
    z-index: 2;
}

/* Overlay canvas - top layer for previews */
#overlay-canvas {
    display: block;
    position: absolute;
    top: 0;
    left: 0;
    touch-action: none;
    pointer-events: none;
    user-select: none;
    -webkit-user-select: none;
    -webkit-touch-callout: none;
    z-index: 5;
}

#canvas-container.paper-mode {
    background: var(--paper-bg);
}

/* Toast Notification */
.toast {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: var(--bg-secondary);
    color: var(--text-primary);
    padding: 12px 24px;
    border-radius: 8px;
    box-shadow: 0 4px 16px var(--shadow);
    z-index: 999;
    opacity: 0;
    transition: all 0.3s ease;
    font-size: 14px;
    max-width: 90%;
    text-align: center;
    pointer-events: none;
}

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

.toast button {
    margin-left: 12px;
    padding: 4px 12px;
    border: none;
    border-radius: 4px;
    background: var(--accent);
    color: white;
    cursor: pointer;
    font-size: 13px;
}

/* Safe area support for iOS */
@supports (padding: max(0px)) {
    .navbar {
        padding-left: max(16px, env(safe-area-inset-left));
        padding-right: max(16px, env(safe-area-inset-right));
        padding-top: max(12px, env(safe-area-inset-top));
    }
    
    #canvas-container {
        padding-left: env(safe-area-inset-left);
        padding-right: env(safe-area-inset-right);
        padding-bottom: env(safe-area-inset-bottom);
    }
}

/* Mobile optimizations */
@media (max-width: 768px) {
    .navbar {
        padding: 8px 12px;
        gap: 12px;
    }
    
    .nav-section {
        gap: 6px;
    }
    
    .nav-section label {
        font-size: 13px;
    }
    
    .tool-btn {
        padding: 6px 12px;
        font-size: 13px;
        min-height: 32px;
    }
    
    .color-swatch {
        width: 28px;
        height: 28px;
    }
    
    #custom-color {
        width: 28px;
        height: 28px;
    }
    
    .intro-content {
        padding: 24px;
    }
    
    .intro-header h1 {
        font-size: 28px;
    }
}

/* Collaboration Status */
.collab-status-section {
    margin-left: auto;
    gap: 12px;
}

.collab-status, .tool-status {
    display: inline-block;
    padding: 6px 12px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 600;
    background: var(--bg-primary);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    white-space: nowrap;
}

.collab-status.disconnected {
    background: #e8e8e8;
    color: #555555;
}

.collab-status.connecting,
.collab-status.creating-offer,
.collab-status.waiting-for-answer,
.collab-status.ready-to-join {
    background: #cccccc;
    color: #3a3a3a;
}

.collab-status.connected {
    background: #888888;
    color: #1a1a1a;
}

.collab-status.encrypted {
    background: #6b6b6b;
    color: #f5f5f5;
}

[data-theme="dark"] .collab-status.disconnected {
    background: #2c2c2c;
    color: #888888;
}

[data-theme="dark"] .collab-status.connecting,
[data-theme="dark"] .collab-status.creating-offer,
[data-theme="dark"] .collab-status.waiting-for-answer,
[data-theme="dark"] .collab-status.ready-to-join {
    background: #3a3a3a;
    color: #cccccc;
}

[data-theme="dark"] .collab-status.connected {
    background: #555555;
    color: #e8e8e8;
}

[data-theme="dark"] .collab-status.encrypted {
    background: #6b6b6b;
    color: #f5f5f5;
}

/* Modal Overlay */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(8px);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    opacity: 1;
    animation: fadeIn 0.3s ease-out;
}

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

.modal-content {
    background: var(--bg-secondary);
    border-radius: 16px;
    max-width: 600px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 8px 32px var(--shadow);
    animation: slideUp 0.4s ease-out;
}

.collab-modal {
    max-width: 700px;
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 24px;
    border-bottom: 2px solid var(--border-color);
}

.modal-header h2 {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0;
}

.close-btn {
    background: none;
    border: none;
    font-size: 32px;
    line-height: 1;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 4px;
    transition: all 0.2s ease;
}

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

.modal-tabs {
    display: flex;
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-primary);
}

.tab-btn {
    flex: 1;
    padding: 12px 16px;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    border-bottom: 2px solid transparent;
}

.tab-btn:hover {
    background: var(--bg-secondary);
}

.tab-btn.active {
    color: var(--accent);
    border-bottom-color: var(--accent);
    background: var(--bg-secondary);
}

.modal-body {
    padding: 24px;
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

.info-box {
    background: var(--bg-primary);
    padding: 16px;
    border-radius: 8px;
    margin-bottom: 20px;
    border-left: 4px solid var(--accent);
}

.info-box p {
    margin: 0 0 8px 0;
    font-size: 14px;
    color: var(--text-primary);
}

.info-box ol {
    margin: 8px 0 0 20px;
    padding: 0;
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.6;
}

.info-box li {
    margin-bottom: 4px;
}

.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    margin-bottom: 6px;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
}

.form-group input[type="password"],
.form-group textarea {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 14px;
    font-family: inherit;
    resize: vertical;
}

.form-group input[type="password"]:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(90, 141, 238, 0.1);
}

.output-section,
.input-section {
    margin-top: 20px;
    padding: 16px;
    background: var(--bg-primary);
    border-radius: 8px;
}

.output-section.hidden,
.input-section.hidden {
    display: none;
}

.output-section label,
.input-section label {
    display: block;
    margin-bottom: 8px;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
}

.output-section textarea {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 12px;
    font-family: 'Courier New', monospace;
    resize: vertical;
    margin-bottom: 8px;
}

.modal-footer {
    padding: 16px 24px;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.error-message {
    padding: 12px 16px;
    background: #cccccc;
    color: #2c2c2c;
    border-radius: 6px;
    font-size: 13px;
    font-weight: 500;
    flex: 1;
}

.error-message.hidden {
    display: none;
}

[data-theme="dark"] .error-message {
    background: #3a3a3a;
    color: #cccccc;
}

/* Connection Success Modal */
.connection-success {
    max-width: 500px;
    text-align: center;
}

.connection-success .modal-header {
    justify-content: center;
    border-bottom: none;
    padding-bottom: 10px;
}

.connection-names {
    display: flex;
    align-items: center;
    justify-content: space-around;
    margin: 20px 0;
    padding: 20px;
    background: var(--bg-primary);
    border-radius: 12px;
    gap: 15px;
}

.name-item {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.name-label {
    font-size: 12px;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.name-value {
    font-size: 18px;
    font-weight: 700;
    color: var(--accent);
    padding: 8px 16px;
    background: var(--bg-secondary);
    border-radius: 8px;
    border: 2px solid var(--border-color);
}

.connection-arrow {
    font-size: 24px;
    color: var(--text-secondary);
}

.connection-message {
    margin: 16px 0;
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.5;
}

.modal-footer {
    padding: 16px 24px;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: center;
    gap: 10px;
}

/* High contrast improvements for accessibility */
@media (prefers-contrast: high) {
    :root {
        --border-color: #999999;
    }
    
    [data-theme="dark"] {
        --border-color: #888888;
    }
}

/* Tools Dropdown */
.tools-dropdown {
    position: relative;
    display: inline-block;
}

.dropdown-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    margin-top: 4px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    box-shadow: 0 4px 16px var(--shadow);
    z-index: 100;
    min-width: 150px;
}

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

.dropdown-item {
    display: block;
    width: 100%;
    padding: 10px 16px;
    border: none;
    background: none;
    color: var(--text-primary);
    font-size: 14px;
    text-align: left;
    cursor: pointer;
    transition: background 0.2s ease;
}

.dropdown-item:hover {
    background: var(--bg-primary);
}

.dropdown-item:first-child {
    border-radius: 6px 6px 0 0;
}

.dropdown-item:last-child {
    border-radius: 0 0 6px 6px;
}

/* Shapes Panel */
.shapes-panel {
    position: absolute;
    top: 20px;
    right: 20px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 16px;
    box-shadow: 0 4px 16px var(--shadow);
    z-index: 50;
    min-width: 200px;
}

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

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

.panel-header h3 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.close-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 20px;
    cursor: pointer;
    padding: 0;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 4px;
    transition: all 0.2s ease;
}

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

.shapes-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
    margin-bottom: 12px;
}

.shape-btn {
    padding: 12px;
    border: 2px solid var(--border-color);
    border-radius: 6px;
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 24px;
    cursor: pointer;
    transition: all 0.2s ease;
    aspect-ratio: 1;
    display: flex;
    align-items: center;
    justify-content: center;
}

.shape-btn:hover {
    background: var(--border-color);
    transform: translateY(-2px);
}

.shape-btn.active {
    background: var(--accent);
    color: white;
    border-color: var(--accent);
}

.shape-controls {
    padding-top: 8px;
    border-top: 1px solid var(--border-color);
}

.shape-controls label {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    color: var(--text-primary);
    cursor: pointer;
}

.shape-controls input[type="checkbox"] {
    cursor: pointer;
}

/* Ruler Overlay */
.ruler-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 40;
}

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

.ruler-container {
    width: 100%;
    height: 100%;
    position: relative;
}

.ruler {
    position: absolute;
    background: rgba(100, 100, 100, 0.8);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
    pointer-events: auto;
    cursor: move;
    user-select: none;
}

.horizontal-ruler {
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    width: 600px;
    height: 40px;
    border-radius: 4px;
}

.vertical-ruler {
    top: 50%;
    left: 20px;
    transform: translateY(-50%);
    width: 40px;
    height: 600px;
    border-radius: 4px;
}

.ruler-measurements {
    width: 100%;
    height: 100%;
    position: relative;
}

.horizontal-ruler .ruler-measurements {
    display: flex;
    align-items: center;
    padding: 0 10px;
}

.vertical-ruler .ruler-measurements {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 10px 0;
}

.close-ruler-btn {
    position: absolute;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    padding: 10px 20px;
    background: var(--accent);
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    pointer-events: auto;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
    transition: all 0.2s ease;
}

.close-ruler-btn:hover {
    background: var(--accent-hover);
    transform: translateX(-50%) translateY(-2px);
}

/* Ruler measurement marks */
.ruler-mark {
    position: absolute;
    background: white;
}

.horizontal-ruler .ruler-mark {
    width: 2px;
    top: 0;
}

.horizontal-ruler .ruler-mark.major {
    height: 30px;
}

.horizontal-ruler .ruler-mark.minor {
    height: 20px;
}

.vertical-ruler .ruler-mark {
    height: 2px;
    left: 0;
}

.vertical-ruler .ruler-mark.major {
    width: 30px;
}

.vertical-ruler .ruler-mark.minor {
    width: 20px;
}

.ruler-label {
    position: absolute;
    color: white;
    font-size: 11px;
    font-weight: bold;
}

.horizontal-ruler .ruler-label {
    top: 5px;
}

.vertical-ruler .ruler-label {
    left: 5px;
    writing-mode: vertical-rl;
}

/* Ruler resize handles */
.resize-handle {
    position: absolute;
    background: rgba(255, 255, 255, 0.6);
    cursor: pointer;
    z-index: 10;
    transition: background 0.2s ease;
}

.resize-handle:hover {
    background: rgba(255, 255, 255, 0.9);
}

.resize-handle-h {
    right: 0;
    top: 0;
    width: 20px;
    height: 100%;
    cursor: ew-resize;
    border-top-right-radius: 4px;
    border-bottom-right-radius: 4px;
}

.resize-handle-v {
    bottom: 0;
    left: 0;
    width: 100%;
    height: 20px;
    cursor: ns-resize;
    border-bottom-left-radius: 4px;
    border-bottom-right-radius: 4px;
}

/* Ruler controls */
.ruler-controls {
    position: absolute;
    bottom: 80px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--bg-secondary);
    padding: 15px 20px;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
    display: flex;
    gap: 20px;
    align-items: center;
    pointer-events: auto;
    z-index: 45;
}

.ruler-control-group {
    display: flex;
    align-items: center;
    gap: 10px;
}

.ruler-control-group label {
    font-size: 13px;
    font-weight: 500;
    color: var(--text);
    white-space: nowrap;
}

.ruler-control-group input[type="range"] {
    width: 150px;
}

.ruler-control-group span {
    font-size: 13px;
    font-weight: bold;
    color: var(--accent);
    min-width: 40px;
}

.ruler-controls .secondary-btn {
    padding: 8px 16px;
    font-size: 13px;
    background: var(--accent);
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.ruler-controls .secondary-btn:hover {
    background: var(--accent-hover);
}

/* Mobile adjustments for new features */
@media (max-width: 768px) {
    .shapes-panel {
        right: 10px;
        top: 10px;
        min-width: 180px;
    }
    
    .horizontal-ruler {
        width: 90%;
        max-width: 400px;
    }
    
    .vertical-ruler {
        height: 90%;
        max-height: 400px;
    }
    
    .ruler-controls {
        flex-direction: column;
        gap: 10px;
        bottom: 70px;
        padding: 12px 15px;
    }
    
    .ruler-control-group input[type="range"] {
        width: 120px;
    }
}

/* Text Dialog */
.text-dialog {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 24px;
    box-shadow: 0 8px 32px var(--shadow);
    z-index: 100;
    min-width: 300px;
    max-width: 500px;
}

.text-dialog.hidden {
    display: none;
}

.text-dialog-content textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 16px;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    resize: vertical;
    margin-bottom: 16px;
}

.text-dialog-content textarea:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(90, 141, 238, 0.1);
}

.text-dialog-actions {
    display: flex;
    gap: 12px;
    justify-content: flex-end;
}

.text-dialog-actions button {
    padding: 10px 20px;
    border: none;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

/* Selection highlight */
.selection-box {
    position: absolute;
    border: 2px dashed var(--accent);
    background: rgba(90, 141, 238, 0.1);
    pointer-events: none;
    z-index: 20;
}

/* Object handles */
.object-handle {
    position: absolute;
    width: 10px;
    height: 10px;
    background: white;
    border: 2px solid var(--accent);
    border-radius: 50%;
    cursor: pointer;
    z-index: 21;
}