/* Base styles and variables */
:root {
    --color-bg: #faf8f5;
    --color-surface: #ffffff;
    --color-text: #2d2a26;
    --color-text-secondary: #7a7267;
    --color-primary: #c4a77d;
    --color-primary-hover: #b39567;
    --color-secondary: #f5f2ed;
    --color-secondary-hover: #ebe6de;
    --color-border: #e8e4dc;
    --color-accent: #d4a574;
    --color-accent-2: #8fae8b;
    --shadow-sm: 0 1px 3px rgba(45, 42, 38, 0.04);
    --shadow-md: 0 4px 16px rgba(45, 42, 38, 0.06);
    --shadow-lg: 0 12px 32px rgba(45, 42, 38, 0.08);
    --radius: 12px;
    --radius-lg: 20px;
    --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(ellipse at 0% 0%, rgba(196, 167, 125, 0.08) 0%, transparent 50%),
        radial-gradient(ellipse at 100% 100%, rgba(143, 174, 139, 0.06) 0%, transparent 50%);
    color: var(--color-text);
    line-height: 1.7;
    min-height: 100vh;
}

/* Container */
.container {
    max-width: 760px;
    margin: 0 auto;
    padding: 4rem 2rem;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header */
header {
    text-align: center;
    margin-bottom: 2rem;
}

h1 {
    font-family: var(--font-display);
    font-size: 1.875rem;
    font-weight: 500;
    color: var(--color-text);
    letter-spacing: -0.02em;
    line-height: 1.3;
}

/* Introduction section */
.introduction {
    margin-top: 2.5rem;
    padding: 1.5rem 2rem;
    background: var(--color-surface);
    border-radius: var(--radius);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-sm);
}

.introduction p {
    font-family: var(--font-sans);
    font-size: 0.875rem;
    color: #4a453e;
    line-height: 1.75;
    text-align: left;
    max-width: 100%;
}

/* 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: 420px;
    background: linear-gradient(160deg, #e8e4dc 0%, #ddd8ce 50%, #d4cfc5 100%);
}

.viewer-placeholder {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(160deg, #f5f2ed 0%, #ebe6de 50%, #e3ded4 100%);
}

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

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

.protein-icon {
    width: 64px;
    height: 64px;
    margin-bottom: 1rem;
    opacity: 0.25;
}

.placeholder-content p {
    font-family: var(--font-sans);
    font-size: 0.875rem;
    font-weight: 400;
    letter-spacing: 0.01em;
}

/* Loading overlay */
.loading-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(235, 230, 222, 0.95);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10;
    backdrop-filter: blur(8px);
}

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

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

.loading-spinner {
    width: 36px;
    height: 36px;
    border: 2px solid rgba(45, 42, 38, 0.1);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 1.25rem;
}

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

.loading-text {
    font-family: var(--font-sans);
    font-size: 0.875rem;
    font-weight: 400;
    margin-bottom: 1.25rem;
    color: var(--color-text-secondary);
    letter-spacing: 0.01em;
}

.progress-bar {
    width: 180px;
    height: 3px;
    background: rgba(45, 42, 38, 0.08);
    border-radius: 2px;
    overflow: hidden;
    margin: 0 auto;
}

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

/* Controls */
.controls {
    display: flex;
    gap: 0.75rem;
    justify-content: center;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    font-family: var(--font-sans);
    font-size: 0.875rem;
    font-weight: 500;
    letter-spacing: 0.01em;
    border-radius: var(--radius);
    border: none;
    cursor: pointer;
    transition: all 0.2s ease;
    position: relative;
}

.btn:disabled {
    opacity: 0.4;
    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: 1px solid var(--color-border);
    box-shadow: var(--shadow-sm);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--color-secondary);
    border-color: #d8d3c9;
    transform: translateY(-1px);
}

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

/* Metadata */
.metadata {
    display: flex;
    justify-content: center;
    gap: 3rem;
    padding: 1rem 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: 0.625rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-text-secondary);
    margin-bottom: 0.25rem;
    font-weight: 500;
}

.metadata-value {
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    color: var(--color-text);
    font-weight: 400;
}

/* 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: 0.8125rem;
    font-weight: 500;
    color: var(--color-text);
    white-space: nowrap;
}

.slider-wrapper {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 0.375rem;
}

.token-slider {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 4px;
    background: var(--color-secondary);
    border-radius: 2px;
    outline: none;
    cursor: pointer;
}

.token-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 16px;
    height: 16px;
    background: var(--color-primary);
    border-radius: 50%;
    cursor: pointer;
    transition: transform 0.15s ease, box-shadow 0.15s ease;
    box-shadow: 0 1px 4px rgba(45, 42, 38, 0.15);
}

.token-slider::-webkit-slider-thumb:hover {
    transform: scale(1.1);
    box-shadow: 0 2px 8px rgba(45, 42, 38, 0.2);
}

.token-slider::-moz-range-thumb {
    width: 16px;
    height: 16px;
    background: var(--color-primary);
    border-radius: 50%;
    cursor: pointer;
    border: none;
    transition: transform 0.15s ease, box-shadow 0.15s ease;
    box-shadow: 0 1px 4px rgba(45, 42, 38, 0.15);
}

.token-slider::-moz-range-thumb:hover {
    transform: scale(1.1);
    box-shadow: 0 2px 8px rgba(45, 42, 38, 0.2);
}

.slider-ticks {
    display: flex;
    justify-content: space-between;
    padding: 0 6px;
}

.slider-ticks .tick {
    font-family: var(--font-mono);
    font-size: 0.6875rem;
    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: 0.875rem;
    font-weight: 500;
    color: var(--color-primary);
    min-width: 2.5rem;
    text-align: center;
}

/* Footer */
footer {
    margin-top: 3rem;
    text-align: center;
    padding-top: 1.5rem;
    border-top: 1px solid var(--color-border);
}

footer p {
    font-family: var(--font-sans);
    font-size: 0.75rem;
    color: var(--color-text-secondary);
    letter-spacing: 0.01em;
}

/* Responsive */
@media (max-width: 640px) {
    .container {
        padding: 2.5rem 1.25rem;
    }

    h1 {
        font-size: 1.5rem;
    }

    .introduction {
        padding: 1.25rem 1.5rem;
        margin-top: 2rem;
    }

    .mol-viewer {
        height: 320px;
    }

    .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);
}