/* ========================================
   UI Density Tester — Emerald Night Theme
   ======================================== */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

:root {
    --primary: #00B894;
    --primary-glow: rgba(0, 184, 148, 0.2);
    --secondary: #55EFC4;
    --accent: #FDCB6E;
    --bg-deep: #0A1F1C;
    --bg-base: #112B26;
    --bg-surface: #1A3D35;
    --bg-elevated: #245045;
    --text-primary: #E8F5E9;
    --text-secondary: #81C784;
    --text-muted: #4CAF50;
    --border: rgba(0, 184, 148, 0.2);
    --border-hover: rgba(85, 239, 196, 0.3);
    --radius: 12px;
    --radius-sm: 8px;
    --font-sans: 'Inter', system-ui, sans-serif;
    --transition: 250ms ease;
}

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

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
}

body {
    font-family: var(--font-sans);
    background: var(--bg-deep);
    color: var(--text-primary);
    min-height: 100vh;
}

.app {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 16px 60px;
}

.header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 700;
    font-size: 1.1rem;
}

.logo-icon {
    width: 32px;
    height: 32px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
}

.header-actions {
    display: flex;
    gap: 6px;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 7px 14px;
    border-radius: var(--radius-sm);
    font-family: var(--font-sans);
    font-size: 0.78rem;
    font-weight: 500;
    border: 1px solid var(--border);
    background: var(--bg-surface);
    color: var(--text-primary);
    cursor: pointer;
    transition: all var(--transition);
}

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

.btn-ghost {
    background: transparent;
    border-color: transparent;
    color: var(--text-muted);
}

/* Upload */
.upload-zone {
    border: 2px dashed var(--border);
    border-radius: var(--radius);
    padding: 60px 30px;
    text-align: center;
    cursor: pointer;
    transition: all var(--transition);
    margin-bottom: 16px;
}

.upload-zone:hover,
.upload-zone.dragover {
    border-color: var(--primary);
    background: rgba(0, 184, 148, 0.05);
}

.upload-icon {
    font-size: 2.5rem;
    margin-bottom: 10px;
}

.upload-hint {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 6px;
}

/* Toolbar */
.toolbar {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 12px 16px;
    background: var(--bg-base);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    margin-bottom: 16px;
    flex-wrap: wrap;
}

.toolbar-group {
    display: flex;
    align-items: center;
    gap: 8px;
}

.toggle-label {
    display: flex;
    align-items: center;
    gap: 5px;
    font-size: 0.78rem;
    color: var(--text-secondary);
    cursor: pointer;
    white-space: nowrap;
}

.toggle-label input {
    accent-color: var(--primary);
}

.control-label {
    font-size: 0.68rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.color-input {
    width: 28px;
    height: 24px;
    border: none;
    cursor: pointer;
    border-radius: 4px;
    background: none;
}

.range-input {
    width: 80px;
    accent-color: var(--primary);
}

.zoom-label {
    font-size: 0.72rem;
    color: var(--primary);
    font-weight: 600;
    min-width: 36px;
}

/* Canvas */
.canvas-wrapper {
    position: relative;
    overflow: auto;
    background: var(--bg-base);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    max-height: 70vh;
}

canvas {
    display: block;
    cursor: crosshair;
}

.measure-info {
    position: absolute;
    padding: 4px 10px;
    background: rgba(0, 0, 0, 0.85);
    border-radius: 6px;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--accent);
    pointer-events: none;
    white-space: nowrap;
}

/* Toast */
.toast-container {
    position: fixed;
    bottom: 20px;
    right: 20px;
    z-index: 2000;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.toast {
    padding: 10px 14px;
    background: rgba(17, 43, 38, 0.92);
    backdrop-filter: blur(16px);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 0.82rem;
    color: var(--text-primary);
    animation: toast-in 0.3s ease-out;
}

.toast.success {
    border-left: 3px solid var(--primary);
}

@keyframes toast-in {
    from {
        opacity: 0;
        transform: translateX(30px);
    }

    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@media (max-width: 600px) {
    .toolbar {
        flex-direction: column;
        align-items: flex-start;
    }

    .logo span {
        display: none;
    }
}