/* ChemSketch — Dark Theme */
:root {
    --bg-primary: #0d1117;
    --bg-secondary: #161b22;
    --bg-tertiary: #21262d;
    --border-color: #30363d;
    --text-primary: #e6edf3;
    --text-secondary: #8b949e;
    --accent: #58a6ff;
    --accent-hover: #79b8ff;
    --success: #3fb950;
    --error: #f85149;
    --warning: #d29922;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

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

header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* Main Layout */
main {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    flex: 1;
}

/* Input Section */
.input-section {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.input-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
}

.input-wrapper {
    display: flex;
    gap: 0.5rem;
}

#smiles-input,
#name-input {
    flex: 1;
    padding: 0.75rem 1rem;
    font-size: 1rem;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    transition: border-color 0.2s, box-shadow 0.2s;
}

#name-input {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

#smiles-input:focus,
#name-input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(88, 166, 255, 0.2);
}

#smiles-input::placeholder,
#name-input::placeholder {
    color: var(--text-secondary);
}

/* Search Status */
.search-status {
    font-size: 0.875rem;
    min-height: 1.25rem;
    margin-top: 0.5rem;
    transition: color 0.2s;
}

.search-status.loading {
    color: var(--accent);
}

.search-status.success {
    color: var(--success);
}

.search-status.error {
    color: var(--error);
}

.btn-primary {
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    background: var(--accent);
    color: var(--bg-primary);
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: background 0.2s, transform 0.1s;
}

.btn-primary:hover {
    background: var(--accent-hover);
}

.btn-primary:active {
    transform: scale(0.98);
}

.error-msg {
    color: var(--error);
    font-size: 0.875rem;
    min-height: 1.25rem;
    margin-top: 0.5rem;
}

/* Molecules Library */
.molecules-library h3 {
    font-size: 0.875rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.75rem;
}

.molecule-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.molecule-buttons button {
    padding: 0.5rem 0.75rem;
    font-size: 0.875rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.2s;
}

.molecule-buttons button:hover {
    background: var(--bg-secondary);
    border-color: var(--accent);
    color: var(--accent);
}

/* Render Section */
.render-section {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.canvas-container {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 400px;
}

#molecule-canvas {
    max-width: 100%;
    height: auto;
    background: #ffffff;
    border-radius: 8px;
}

.molecule-name {
    margin-top: 0.75rem;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* Export Buttons */
.export-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.btn-export {
    flex: 1;
    min-width: 120px;
    padding: 0.625rem 1rem;
    font-size: 0.875rem;
    font-weight: 500;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.btn-export:hover:not(:disabled) {
    background: var(--bg-secondary);
    border-color: var(--accent);
}

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

.btn-export.success {
    background: var(--success);
    border-color: var(--success);
    color: white;
}

/* Footer */
footer {
    text-align: center;
    padding-top: 2rem;
    margin-top: auto;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

footer a {
    color: var(--accent);
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}

.hint {
    margin-top: 0.5rem;
    font-size: 0.75rem;
}

/* Toast Notification */
.toast {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    padding: 0.75rem 1.5rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 0.875rem;
    z-index: 1000;
    animation: slideUp 0.3s ease;
}

.toast.success {
    border-color: var(--success);
    background: rgba(63, 185, 80, 0.15);
}

.toast.error {
    border-color: var(--error);
    background: rgba(248, 81, 73, 0.15);
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateX(-50%) translateY(1rem);
    }
    to {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
}

/* Responsive */
@media (max-width: 900px) {
    main {
        grid-template-columns: 1fr;
    }

    .container {
        padding: 1rem;
    }

    header h1 {
        font-size: 2rem;
    }

    .canvas-container {
        min-height: 300px;
    }

    #molecule-canvas {
        width: 100%;
        max-width: 400px;
    }
}

@media (max-width: 500px) {
    .input-wrapper {
        flex-direction: column;
    }

    .btn-primary {
        width: 100%;
    }

    .export-buttons {
        flex-direction: column;
    }

    .btn-export {
        width: 100%;
    }
}