/**
 * Shared Utilities & Design Tokens
 *
 * Contains: Design tokens, reset, form elements, buttons, spinner
 * Used by: All modules
 */

/* ===== Design Tokens (Dark Mode OLED - Scientific) ===== */
:root {
    /* Background */
    --bg-primary: #0f0f0f;
    --bg-secondary: #1a1a1a;
    --bg-tertiary: #252525;
    --bg-hover: #2a2a2a;

    /* Text */
    --text-primary: #f5f5f5;
    --text-secondary: #a0a0a0;
    --text-muted: #666666;

    /* Accent Colors */
    --accent-blue: #3B82F6;
    --accent-blue-light: #60A5FA;
    --accent-orange: #F97316;
    --accent-green: #22C55E;
    --accent-red: #EF4444;
    --accent-purple: #8B5CF6;

    /* Borders */
    --border-subtle: rgba(255, 255, 255, 0.1);
    --border-accent: rgba(59, 130, 246, 0.3);

    /* Shadows */
    --glow-blue: 0 0 20px rgba(59, 130, 246, 0.3);

    /* Typography */
    --font-mono: 'Fira Code', monospace;
    --font-sans: 'Fira Sans', -apple-system, BlinkMacSystemFont, sans-serif;

    /* Sizing */
    --sidebar-width: 320px;
    --header-height: 60px;
}

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

body {
    font-family: var(--font-sans);
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
}

/* ===== Form Elements ===== */
.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-group label {
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.625rem 0.875rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-subtle);
    border-radius: 8px;
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 0.85rem;
    transition: all 0.2s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent-blue);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

.form-group input::placeholder {
    color: var(--text-muted);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
}

/* Checkbox */
.checkbox-group {
    flex-direction: row;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    font-size: 0.85rem;
    color: var(--text-primary);
}

.checkbox-label input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: var(--accent-blue);
    cursor: pointer;
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.25rem;
    font-size: 0.9rem;
    font-weight: 500;
    font-family: var(--font-sans);
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-blue-light));
    color: white;
    width: 100%;
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--glow-blue);
}

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

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-subtle);
}

.btn-secondary:hover {
    background: var(--bg-hover);
    border-color: var(--accent-blue);
}

.btn-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-subtle);
    border-radius: 8px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s;
}

.btn-icon:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
    border-color: var(--accent-blue);
}

.btn-icon.active {
    background: var(--accent-blue);
    border-color: var(--accent-blue);
    color: white;
}

.btn-sm {
    width: 30px;
    height: 30px;
    min-width: 30px;
    min-height: 30px;
    padding: 5px;
    border-radius: 6px;
    transition: all 0.15s ease-out;
}

.btn-sm:not(:disabled):hover {
    background: rgba(59, 130, 246, 0.15);
    color: var(--accent-blue);
}

.btn-sm:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

/* ===== Spinner ===== */
.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-subtle);
    border-top-color: var(--accent-blue);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* ===== Modal Base ===== */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.85);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 200;
    backdrop-filter: blur(8px);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.25s ease-out, visibility 0.25s ease-out;
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal {
    background: var(--bg-secondary);
    border: 1px solid var(--border-subtle);
    border-radius: 16px;
    max-height: 90vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    box-shadow:
        0 0 0 1px rgba(255, 255, 255, 0.05),
        0 25px 50px -12px rgba(0, 0, 0, 0.5),
        0 0 80px rgba(59, 130, 246, 0.1);
    transform: scale(0.95) translateY(10px);
    opacity: 0;
    transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1), opacity 0.25s ease-out;
}

.modal-overlay.active .modal {
    transform: scale(1) translateY(0);
    opacity: 1;
}

.modal-large {
    width: 90%;
    max-width: 1200px;
    height: 80vh;
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 1.5rem;
    background: linear-gradient(180deg, var(--bg-tertiary) 0%, rgba(37, 37, 37, 0.8) 100%);
    border-bottom: 1px solid var(--border-subtle);
    flex-shrink: 0;
}

.modal-header h3 {
    display: flex;
    align-items: center;
    gap: 0.625rem;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
}

.modal-header h3 svg {
    color: var(--accent-blue);
    filter: drop-shadow(0 0 6px rgba(59, 130, 246, 0.4));
}

.modal-close {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 24px;
    cursor: pointer;
    border-radius: 8px;
    transition: all 0.2s ease-out;
}

.modal-close:hover {
    background: rgba(239, 68, 68, 0.15);
    color: var(--accent-red);
    transform: scale(1.05);
}

.modal-close:active {
    transform: scale(0.95);
}

.modal-body {
    flex: 1;
    overflow: hidden;
}

/* ===== Loading Text ===== */
.loading-text {
    padding: 1.5rem;
    color: var(--text-muted);
    font-size: 0.85rem;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
}

.loading-text::before {
    content: '';
    width: 24px;
    height: 24px;
    border: 2px solid var(--border-subtle);
    border-top-color: var(--accent-blue);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

/* ===== Reduced Motion Support ===== */
@media (prefers-reduced-motion: reduce) {
    .modal-overlay,
    .modal,
    .btn,
    .btn-icon {
        transition: none;
    }

    .modal-overlay.active .modal {
        transform: none;
    }

    .spinner,
    .loading-text::before {
        animation: none;
        border-top-color: var(--accent-blue);
        border-right-color: var(--accent-blue);
    }
}