/* ========================================
   Animated Gradient Generator — Dark Theme
   ======================================== */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
    --bg-deep: #0F172A;
    --bg-base: #1E293B;
    --bg-surface: #334155;
    --bg-elevated: #475569;

    --text-primary: #F1F5F9;
    --text-secondary: #94A3B8;
    --text-muted: #64748B;

    --border: rgba(51, 65, 85, 0.6);
    --accent: #8B5CF6;
    --accent-glow: rgba(139, 92, 246, 0.2);
    --success: #10B981;

    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;

    --font-sans: 'Inter', system-ui, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    --transition: 200ms 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: 760px;
    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, #ec4899, #8b5cf6, #06b6d4);
    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-sm {
    padding: 4px 10px;
    font-size: 0.72rem;
}

.card {
    background: var(--bg-base);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 22px;
    margin-bottom: 16px;
}

.section-title {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 14px;
}

/* Preview */
.preview-card {
    margin-bottom: 16px;
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.preview-box {
    width: 100%;
    height: 220px;
    border-radius: var(--radius-lg);
    transition: height 0.3s;
}

/* Controls */
.controls-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 14px;
    margin-bottom: 14px;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.control-label {
    font-size: 0.72rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--text-muted);
}

.control-select {
    padding: 7px 10px;
    font-family: var(--font-sans);
    font-size: 0.82rem;
    color: var(--text-primary);
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    outline: none;
}

.control-range {
    width: 100%;
    accent-color: var(--accent);
}

.range-value {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--accent);
}

/* Color Stops */
.stops-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 8px;
}

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

.stop-row {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 12px;
    background: var(--bg-surface);
    border-radius: var(--radius-sm);
}

.stop-color-input {
    width: 36px;
    height: 28px;
    border: none;
    cursor: pointer;
    border-radius: 4px;
    background: none;
}

.stop-position {
    width: 60px;
    padding: 4px 6px;
    font-family: var(--font-mono);
    font-size: 0.78rem;
    color: var(--text-primary);
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: 4px;
    text-align: center;
    outline: none;
}

.stop-remove {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 0.9rem;
    padding: 2px 6px;
    transition: color var(--transition);
}

.stop-remove:hover {
    color: #ef4444;
}

/* Toggle */
.toggle-group {
    display: flex;
    gap: 16px;
}

.toggle-label {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.78rem;
    color: var(--text-secondary);
    cursor: pointer;
}

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

/* Presets */
.presets-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
    gap: 8px;
}

.preset-swatch {
    width: 100%;
    height: 48px;
    border-radius: var(--radius-sm);
    border: 2px solid transparent;
    cursor: pointer;
    transition: all var(--transition);
}

.preset-swatch:hover {
    border-color: white;
    transform: scale(1.05);
}

/* Code */
.code-output {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 16px;
    overflow-x: auto;
    margin: 0;
}

.code-output code {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    line-height: 1.7;
    color: var(--text-secondary);
    white-space: pre;
}

/* Fullscreen */
body.fullscreen-mode .app {
    display: none;
}

body.fullscreen-mode .fullscreen-preview {
    display: block;
    position: fixed;
    inset: 0;
    z-index: 9000;
    cursor: pointer;
}

.fullscreen-preview {
    display: none;
}

/* 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(30, 41, 59, 0.9);
    backdrop-filter: blur(16px);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    font-size: 0.82rem;
    color: var(--text-primary);
    animation: toast-in 0.3s ease-out;
}

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

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

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

@media (max-width: 600px) {
    .controls-grid {
        grid-template-columns: 1fr;
    }

    .logo span {
        display: none;
    }

    .preview-box {
        height: 160px;
    }
}