* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

:root {
    --bg-primary: #1a1a2e;
    --bg-secondary: #16213e;
    --bg-panel: #252540;
    --text-primary: #ffffff;
    --text-secondary: #a0a0b0;
    --accent: #FFD700;
    --accent-hover: #FFC000;
    --danger: #FF6B6B;
}

body {
    font-family: 'Montserrat', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    overflow: hidden;
    touch-action: manipulation;
    user-select: none;
    -webkit-user-select: none;
}

.app {
    display: flex;
    flex-direction: column;
    height: 100vh;
    height: 100dvh;
}

/* Header */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 16px;
    background: var(--bg-secondary);
    border-bottom: 1px solid rgba(255,255,255,0.1);
    flex-shrink: 0;
}

.header-title {
    font-weight: 600;
    font-size: 16px;
}

.btn-save {
    background: var(--accent);
    color: #1a1a1a;
    border: none;
    padding: 8px 20px;
    border-radius: 20px;
    font-weight: 700;
    font-size: 14px;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-save:active {
    transform: scale(0.95);
    background: var(--accent-hover);
}

/* Canvas Container */
.canvas-container {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 10px;
    overflow: hidden;
    background: #0d0d1a;
}

#canvas {
    border-radius: 8px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.5);
}

/* Toolbar */
.toolbar {
    display: flex;
    justify-content: space-around;
    padding: 8px 4px 12px;
    background: var(--bg-secondary);
    border-top: 1px solid rgba(255,255,255,0.1);
    flex-shrink: 0;
}

.tool-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    background: none;
    border: none;
    color: var(--text-secondary);
    padding: 8px 12px;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.2s;
    min-width: 60px;
}

.tool-btn.active {
    color: var(--accent);
    background: rgba(255,215,0,0.1);
}

.tool-btn:active {
    transform: scale(0.9);
}

.tool-icon {
    font-size: 24px;
}

.tool-label {
    font-size: 11px;
    font-weight: 500;
}

/* Panels */
.panel {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--bg-panel);
    border-radius: 20px 20px 0 0;
    transform: translateY(100%);
    transition: transform 0.3s ease;
    z-index: 100;
    max-height: 70vh;
    overflow-y: auto;
}

.panel.active {
    transform: translateY(0);
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 20px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
    position: sticky;
    top: 0;
    background: var(--bg-panel);
    z-index: 1;
}

.panel-header span {
    font-weight: 600;
    font-size: 16px;
}

.panel-close {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 20px;
    cursor: pointer;
    padding: 4px 8px;
}

.panel-content {
    padding: 16px 20px 30px;
}

/* Styles Grid */
.styles-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
    padding: 16px 20px 30px;
}

.style-card {
    aspect-ratio: 9/16;
    border-radius: 12px;
    overflow: hidden;
    cursor: pointer;
    border: 2px solid transparent;
    transition: all 0.2s;
    position: relative;
}

.style-card.active {
    border-color: var(--accent);
}

.style-card:active {
    transform: scale(0.95);
}

.style-card img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.style-card-name {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(transparent, rgba(0,0,0,0.8));
    padding: 20px 10px 10px;
    font-size: 12px;
    font-weight: 600;
    text-align: center;
}

/* Upload Button */
.upload-btn {
    display: block;
    background: rgba(255,255,255,0.1);
    border: 2px dashed rgba(255,255,255,0.3);
    border-radius: 12px;
    padding: 20px;
    text-align: center;
    cursor: pointer;
    font-size: 16px;
    transition: all 0.2s;
}

.upload-btn:active {
    background: rgba(255,255,255,0.15);
    border-color: var(--accent);
}

/* Color Presets */
.color-presets {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
    margin-top: 16px;
}

.color-preset {
    aspect-ratio: 1;
    border-radius: 12px;
    cursor: pointer;
    border: 2px solid transparent;
    transition: all 0.2s;
}

.color-preset:active,
.color-preset.active {
    border-color: var(--accent);
    transform: scale(0.95);
}

/* Text Panel */
.add-text-btn {
    display: block;
    width: 100%;
    background: rgba(255,255,255,0.1);
    border: none;
    border-radius: 10px;
    padding: 14px;
    color: var(--text-primary);
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    margin-bottom: 10px;
    text-align: left;
    transition: all 0.2s;
}

.add-text-btn:active {
    background: rgba(255,255,255,0.2);
}

.text-edit-section {
    margin-top: 16px;
}

.text-edit-section hr {
    border: none;
    border-top: 1px solid rgba(255,255,255,0.1);
    margin-bottom: 16px;
}

.text-edit-section label {
    display: block;
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 6px;
    margin-top: 12px;
}

.text-edit-section input[type="text"] {
    width: 100%;
    background: rgba(255,255,255,0.1);
    border: none;
    border-radius: 8px;
    padding: 12px;
    color: var(--text-primary);
    font-size: 15px;
}

.text-edit-section input[type="range"] {
    width: 100%;
    height: 6px;
    border-radius: 3px;
    background: rgba(255,255,255,0.2);
    -webkit-appearance: none;
}

.text-edit-section input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--accent);
    cursor: pointer;
}

.color-row {
    display: flex;
    gap: 10px;
}

.text-color {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    border: 2px solid transparent;
    transition: all 0.2s;
}

.text-color:active,
.text-color.active {
    border-color: var(--accent);
    transform: scale(0.9);
}

.delete-btn {
    display: block;
    width: 100%;
    background: var(--danger);
    border: none;
    border-radius: 10px;
    padding: 14px;
    color: white;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    margin-top: 16px;
}

.delete-btn:active {
    opacity: 0.8;
}

/* Hint */
.hint {
    font-size: 13px;
    color: var(--text-secondary);
    margin-top: 12px;
    text-align: center;
}

/* Overlay for panels */
.overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.5);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s;
    z-index: 99;
}

.overlay.active {
    opacity: 1;
    visibility: visible;
}

/* Loading */
.loading {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.8);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 200;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s;
}

.loading.active {
    opacity: 1;
    visibility: visible;
}

.loading-spinner {
    width: 50px;
    height: 50px;
    border: 3px solid rgba(255,255,255,0.2);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.loading-text {
    margin-top: 16px;
    font-size: 14px;
    color: var(--text-secondary);
}

/* Safe area for iOS */
@supports (padding-bottom: env(safe-area-inset-bottom)) {
    .toolbar {
        padding-bottom: calc(12px + env(safe-area-inset-bottom));
    }
    .panel {
        padding-bottom: env(safe-area-inset-bottom);
    }
}

/* Toast notification */
.toast {
    position: fixed;
    bottom: 100px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: rgba(0,0,0,0.9);
    color: white;
    padding: 12px 24px;
    border-radius: 25px;
    font-size: 14px;
    font-weight: 500;
    z-index: 300;
    opacity: 0;
    transition: all 0.3s ease;
    pointer-events: none;
    white-space: nowrap;
}

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

/* Select element buttons */
.select-element-btn {
    display: flex;
    align-items: center;
    gap: 12px;
    width: 100%;
    background: rgba(255,255,255,0.1);
    border: none;
    border-radius: 10px;
    padding: 14px 16px;
    color: var(--text-primary);
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    margin-bottom: 10px;
    text-align: left;
    transition: all 0.2s;
}

.select-element-btn:active {
    background: rgba(255,255,255,0.2);
}

.select-element-btn .icon {
    font-size: 20px;
    width: 30px;
    text-align: center;
}

.select-element-btn .text {
    flex: 1;
}

.select-element-btn .preview {
    font-size: 13px;
    color: var(--text-secondary);
    max-width: 100px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}