/* Base styles and variables */
:root {
    --color-bg: #f8f9fc;
    --color-surface: #ffffff;
    --color-text: #1e293b;
    --color-text-secondary: #64748b;
    --color-primary: #6366f1;
    --color-primary-hover: #4f46e5;
    --color-secondary: #f1f5f9;
    --color-secondary-hover: #e2e8f0;
    --color-border: #e2e8f0;
    --color-accent: #a855f7;
    --color-accent-2: #06b6d4;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 12px 24px rgba(0, 0, 0, 0.12);
    --shadow-glow: 0 0 20px rgba(99, 102, 241, 0.3);
    --radius: 10px;
    --radius-lg: 16px;
    --font-display: 'Space Grotesk', -apple-system, sans-serif;
    --font-sans: 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'IBM Plex Mono', 'Fira Code', monospace;
}

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

body {
    font-family: var(--font-sans);
    background: var(--color-bg);
    background-image:
        radial-gradient(at 20% 20%, rgba(99, 102, 241, 0.04) 0%, transparent 50%),
        radial-gradient(at 80% 80%, rgba(168, 85, 247, 0.04) 0%, transparent 50%);
    color: var(--color-text);
    line-height: 1.6;
    min-height: 100vh;
}

/* Container */
.container {
    max-width: 820px;
    margin: 0 auto;
    padding: 3rem 1.5rem;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header */
header {
    text-align: center;
    margin-bottom: 2.5rem;
}

h1 {
    font-family: var(--font-display);
    font-size: 2.25rem;
    font-weight: 600;
    color: var(--color-text);
    letter-spacing: -0.03em;
    margin-bottom: 0.5rem;
    background: linear-gradient(135deg, var(--color-text) 0%, #475569 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    font-family: var(--font-sans);
    font-size: 1rem;
    color: var(--color-text-secondary);
    font-weight: 400;
    letter-spacing: 0.01em;
}

/* Main content */
main {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

/* Viewer container */
.viewer-container {
    position: relative;
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    border: 1px solid var(--color-border);
}

.mol-viewer {
    width: 100%;
    height: 480px;
    background: linear-gradient(145deg, #e0e7ef 0%, #d1dce8 50%, #c7d4e2 100%);
}

.viewer-placeholder {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(145deg, #f8fafc 0%, #f1f5f9 50%, #e2e8f0 100%);
}

.viewer-placeholder.hidden {
    display: none;
}

.placeholder-content {
    text-align: center;
    color: var(--color-text-secondary);
}

.protein-icon {
    width: 80px;
    height: 80px;
    margin-bottom: 1rem;
    opacity: 0.35;
}

.placeholder-content p {
    font-family: var(--font-sans);
    font-size: 0.9375rem;
    font-weight: 500;
}

/* Loading overlay */
.loading-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(209, 220, 232, 0.95);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10;
    backdrop-filter: blur(4px);
}

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

.loading-content {
    text-align: center;
    color: #1e293b;
}

.loading-spinner {
    width: 44px;
    height: 44px;
    border: 3px solid rgba(0, 0, 0, 0.1);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin: 0 auto 1.25rem;
}

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

.loading-text {
    font-family: var(--font-sans);
    font-size: 0.9375rem;
    font-weight: 500;
    margin-bottom: 1.25rem;
    opacity: 0.9;
    letter-spacing: 0.02em;
}

.progress-bar {
    width: 220px;
    height: 5px;
    background: rgba(0, 0, 0, 0.1);
    border-radius: 3px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--color-accent-2), var(--color-accent));
    border-radius: 3px;
    transition: width 0.3s ease;
}

/* Controls */
.controls {
    display: flex;
    gap: 0.875rem;
    justify-content: center;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.875rem 1.75rem;
    font-family: var(--font-display);
    font-size: 0.9375rem;
    font-weight: 500;
    letter-spacing: 0.01em;
    border-radius: var(--radius);
    border: none;
    cursor: pointer;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

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

.btn-primary {
    background: var(--color-primary);
    color: #ffffff;
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover:not(:disabled) {
    background: var(--color-primary-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-primary:active:not(:disabled) {
    transform: translateY(0);
}

.btn-secondary {
    background: var(--color-surface);
    color: var(--color-text);
    border: 1.5px solid var(--color-border);
    box-shadow: var(--shadow-sm);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--color-secondary);
    border-color: #cbd5e1;
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-secondary:active:not(:disabled) {
    transform: translateY(0);
}

/* Metadata */
.metadata {
    display: flex;
    justify-content: center;
    gap: 2.5rem;
    padding: 1.125rem 1.5rem;
    background: var(--color-surface);
    border-radius: var(--radius);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-sm);
}

.metadata.hidden {
    display: none;
}

.metadata-item {
    text-align: center;
}

.metadata-label {
    display: block;
    font-family: var(--font-sans);
    font-size: 0.6875rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-text-secondary);
    margin-bottom: 0.375rem;
    font-weight: 500;
}

.metadata-value {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    color: var(--color-text);
    font-weight: 500;
}

/* Slider */
.slider-container {
    display: flex;
    align-items: center;
    gap: 1.25rem;
    padding: 1rem 1.5rem;
    background: var(--color-surface);
    border-radius: var(--radius);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-sm);
}

.slider-container.hidden {
    display: none;
}

.slider-label {
    font-family: var(--font-sans);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text);
    white-space: nowrap;
}

.slider-wrapper {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.token-slider {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 6px;
    background: var(--color-secondary);
    border-radius: 3px;
    outline: none;
    cursor: pointer;
}

.token-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    background: var(--color-primary);
    border-radius: 50%;
    cursor: pointer;
    transition: transform 0.15s ease, box-shadow 0.15s ease;
    box-shadow: var(--shadow-sm);
}

.token-slider::-webkit-slider-thumb:hover {
    transform: scale(1.1);
    box-shadow: var(--shadow-md);
}

.token-slider::-moz-range-thumb {
    width: 20px;
    height: 20px;
    background: var(--color-primary);
    border-radius: 50%;
    cursor: pointer;
    border: none;
    transition: transform 0.15s ease, box-shadow 0.15s ease;
    box-shadow: var(--shadow-sm);
}

.token-slider::-moz-range-thumb:hover {
    transform: scale(1.1);
    box-shadow: var(--shadow-md);
}

.slider-ticks {
    display: flex;
    justify-content: space-between;
    padding: 0 8px;
}

.slider-ticks .tick {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: color 0.15s ease;
}

.slider-ticks .tick:hover {
    color: var(--color-primary);
}

.slider-ticks .tick.active {
    color: var(--color-primary);
    font-weight: 500;
}

.slider-value {
    font-family: var(--font-mono);
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--color-primary);
    min-width: 2.5rem;
    text-align: center;
}

/* Footer */
footer {
    margin-top: 2.5rem;
    text-align: center;
    padding-top: 1.5rem;
    border-top: 1px solid var(--color-border);
}

footer p {
    font-family: var(--font-sans);
    font-size: 0.8125rem;
    color: var(--color-text-secondary);
    letter-spacing: 0.01em;
}

/* Responsive */
@media (max-width: 640px) {
    .container {
        padding: 2rem 1rem;
    }

    h1 {
        font-size: 1.75rem;
    }

    .mol-viewer {
        height: 360px;
    }

    .metadata {
        flex-direction: column;
        gap: 0.75rem;
    }

    .controls {
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }
}

/* Smooth transitions for the viewer */
.mol-viewer canvas {
    border-radius: var(--radius-lg);
}