/* ==========================================================================
   22B1 Design System - Components
   Reusable UI components for the research site
   ========================================================================== */

/* ==========================================================================
   BUTTONS
   ========================================================================== */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    font-family: var(--font-ui);
    font-size: var(--text-sm);
    font-weight: var(--font-weight-semibold);
    line-height: 1;
    padding: var(--space-3) var(--space-6);
    border-radius: var(--radius-md);
    border: 2px solid transparent;
    cursor: pointer;
    text-decoration: none;
    transition: all var(--duration-base) var(--ease-out);
}

.btn:focus-visible {
    outline: 2px solid var(--color-brand-gold);
    outline-offset: 2px;
}

/* Primary button - Gold */
.btn-primary {
    background: var(--color-brand-gold);
    color: var(--color-text-inverse);
    border-color: var(--color-brand-gold);
    font-weight: var(--font-weight-semibold);
    letter-spacing: 0.01em;
}

.btn-primary:hover {
    background: var(--color-brand-gold-light);
    border-color: var(--color-brand-gold-light);
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg), var(--shadow-glow-gold);
}

/* Secondary button */
.btn-secondary {
    background: var(--color-bg-surface);
    color: var(--color-text-primary);
    border-color: var(--color-border-strong);
}

.btn-secondary:hover {
    background: var(--color-bg-surface-elevated);
    border-color: var(--color-brand-gold);
    transform: translateY(-2px);
}

/* Outline button */
.btn-outline {
    background: transparent;
    color: var(--color-brand-gold);
    border-color: var(--color-brand-gold);
}

.btn-outline:hover {
    background: var(--color-brand-gold);
    color: var(--color-text-inverse);
    transform: translateY(-2px);
}

/* Ghost button */
.btn-ghost {
    background: transparent;
    color: var(--color-text-secondary);
    border-color: transparent;
}

.btn-ghost:hover {
    background: var(--color-bg-surface);
    color: var(--color-text-primary);
}

/* Button sizes */
.btn-sm {
    font-size: var(--text-xs);
    padding: var(--space-2) var(--space-4);
}

.btn-lg {
    font-size: var(--text-base);
    padding: var(--space-4) var(--space-8);
    font-weight: var(--font-weight-bold);
}

/* ==========================================================================
   CARDS
   ========================================================================== */

.card {
    background: var(--color-bg-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-6);
    transition: all var(--duration-base) var(--ease-out);
}

.card:hover {
    border-color: var(--color-border-strong);
    box-shadow: var(--shadow-md);
}

/* Card as link */
a.card {
    display: block;
    text-decoration: none;
    color: inherit;
}

a.card:hover {
    border-color: var(--color-brand-gold);
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

a.card:hover .card-title {
    color: var(--color-brand-gold);
}

a.card:active {
    transform: translateY(-1px);
    transition-duration: var(--duration-fast);
}

/* Card with accent border */
.card-accent {
    border-left: 3px solid var(--color-brand-gold);
}

.card-accent-blue {
    border-left-color: var(--color-accent-blue);
}

.card-accent-success {
    border-left-color: var(--color-success);
}

/* Card components */
.card-header {
    margin-bottom: var(--space-4);
    padding-bottom: var(--space-4);
    border-bottom: 1px solid var(--color-border-subtle);
}

.card-title {
    font-family: var(--font-heading);
    font-size: var(--text-lg);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    margin-bottom: var(--space-2);
    transition: color var(--duration-fast);
}

.card-subtitle {
    font-size: var(--text-sm);
    color: var(--color-text-tertiary);
}

.card-body {
    color: var(--color-text-secondary);
}

.card-body p {
    margin-bottom: var(--space-4);
}

.card-body p:last-child {
    margin-bottom: 0;
}

.card-footer {
    margin-top: var(--space-4);
    padding-top: var(--space-4);
    border-top: 1px solid var(--color-border-subtle);
}

/* Featured card */
.card-featured {
    background: var(--color-bg-surface-elevated);
    border-left: 4px solid var(--color-brand-gold);
    padding: var(--space-8);
}

.card-featured .card-title {
    font-size: var(--text-xl);
}

/* ==========================================================================
   BADGES & LABELS
   ========================================================================== */

.badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    font-family: var(--font-ui);
    font-size: var(--text-xs);
    font-weight: var(--font-weight-semibold);
    text-transform: uppercase;
    letter-spacing: var(--tracking-wide);
    padding: var(--space-1) var(--space-2);
    border-radius: var(--radius-sm);
}

/* Status badges */
.badge-published {
    background: var(--color-success-subtle);
    color: var(--color-success);
}

.badge-in-progress {
    background: var(--color-warning-subtle);
    color: var(--color-warning);
}

.badge-hypothesis {
    background: var(--color-info-subtle);
    color: var(--color-info);
}

.badge-new {
    background: var(--color-brand-gold-subtle);
    color: var(--color-brand-gold);
}

/* Badge with dot indicator */
.badge-dot::before {
    content: '';
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: currentColor;
}

/* ==========================================================================
   CALLOUTS & ALERTS
   ========================================================================== */

.callout {
    padding: var(--space-6);
    border-radius: var(--radius-lg);
    border-left: 4px solid;
    margin: var(--space-6) 0;
}

.callout-title {
    font-family: var(--font-heading);
    font-size: var(--text-base);
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--space-3);
}

.callout p {
    margin-bottom: var(--space-3);
}

.callout p:last-child {
    margin-bottom: 0;
}

.callout-info {
    background: var(--color-info-subtle);
    border-color: var(--color-info);
}

.callout-info .callout-title {
    color: var(--color-info);
}

.callout-warning {
    background: var(--color-warning-subtle);
    border-color: var(--color-warning);
}

.callout-warning .callout-title {
    color: var(--color-warning);
}

.callout-success {
    background: var(--color-success-subtle);
    border-color: var(--color-success);
}

.callout-success .callout-title {
    color: var(--color-success);
}

.callout-error {
    background: var(--color-error-subtle);
    border-color: var(--color-error);
}

.callout-error .callout-title {
    color: var(--color-error);
}

/* ==========================================================================
   STAT CARDS
   ========================================================================== */

.stat-card {
    background: var(--color-bg-surface);
    border: 1px solid var(--color-border);
    border-left: 3px solid var(--color-brand-gold);
    border-radius: var(--radius-lg);
    padding: var(--space-6);
    transition: all var(--duration-base) var(--ease-out);
}

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.stat-number {
    font-family: var(--font-heading);
    font-size: var(--text-3xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-brand-gold);
    line-height: 1;
    margin-bottom: var(--space-2);
}

.stat-label {
    font-size: var(--text-base);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-2);
}

.stat-source {
    font-size: var(--text-xs);
    color: var(--color-text-muted);
    font-style: italic;
}

/* ==========================================================================
   TABLES
   ========================================================================== */

.table-wrapper {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    margin: var(--space-6) 0;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    font-family: var(--font-ui);
    font-size: var(--text-sm);
}

.data-table th,
.data-table td {
    padding: var(--space-3) var(--space-4);
    text-align: left;
    border-bottom: 1px solid var(--color-border);
}

.data-table th {
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    background: var(--color-bg-surface);
}

.data-table tr:hover td {
    background: var(--color-bg-surface);
}

/* ==========================================================================
   EVIDENCE GRADES
   ========================================================================== */

.grade {
    display: inline-flex;
    align-items: center;
    font-family: var(--font-ui);
    font-size: var(--text-xs);
    font-weight: var(--font-weight-bold);
    text-transform: uppercase;
    letter-spacing: var(--tracking-wide);
    padding: var(--space-1) var(--space-2);
    border-radius: var(--radius-sm);
}

.grade-high {
    background: var(--color-success-subtle);
    color: var(--color-success);
}

.grade-moderate {
    background: var(--color-warning-subtle);
    color: var(--color-warning);
}

.grade-low {
    background: rgba(249, 115, 22, 0.12);
    color: #f97316;
}

.grade-very-low {
    background: var(--color-error-subtle);
    color: var(--color-error);
}

/* ==========================================================================
   HYPOTHESIS BOX
   ========================================================================== */

.hypothesis-box {
    background: var(--color-bg-surface);
    border: 1px solid var(--color-border);
    border-left: 4px solid var(--color-brand-gold);
    border-radius: var(--radius-lg);
    padding: var(--space-8);
    margin: var(--space-8) 0;
}

.hypothesis-label {
    display: inline-block;
    font-family: var(--font-ui);
    font-size: var(--text-xs);
    font-weight: var(--font-weight-bold);
    text-transform: uppercase;
    letter-spacing: var(--tracking-widest);
    color: var(--color-brand-gold);
    background: var(--color-brand-gold-subtle);
    padding: var(--space-1) var(--space-3);
    border-radius: var(--radius-sm);
    margin-bottom: var(--space-4);
}

.hypothesis-statement {
    font-family: var(--font-body);
    font-size: var(--text-lg);
    font-style: italic;
    color: var(--color-text-primary);
    margin-bottom: var(--space-4);
    max-width: 55ch;
}

.hypothesis-criteria {
    font-size: var(--text-sm);
    color: var(--color-text-tertiary);
}

/* ==========================================================================
   PROTOCOL BOX
   ========================================================================== */

.protocol-box {
    background: var(--color-success-subtle);
    border: 1px solid rgba(16, 185, 129, 0.2);
    border-radius: var(--radius-lg);
    padding: var(--space-6);
    margin: var(--space-6) 0;
}

.protocol-header {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin-bottom: var(--space-4);
}

.protocol-icon {
    font-size: var(--text-xl);
}

.protocol-title {
    font-family: var(--font-heading);
    font-size: var(--text-lg);
    font-weight: var(--font-weight-semibold);
    color: var(--color-success);
}

.protocol-steps {
    counter-reset: step;
}

.protocol-steps li {
    position: relative;
    padding-left: var(--space-10);
    margin-bottom: var(--space-4);
    counter-increment: step;
}

.protocol-steps li::before {
    content: counter(step);
    position: absolute;
    left: 0;
    top: 0;
    width: 1.5rem;
    height: 1.5rem;
    background: var(--color-success);
    color: white;
    font-family: var(--font-ui);
    font-size: var(--text-sm);
    font-weight: var(--font-weight-bold);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* ==========================================================================
   RESEARCH LINK CARDS
   ========================================================================== */

.research-link {
    display: block;
    background: var(--color-bg-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-6);
    text-decoration: none;
    transition: all var(--duration-base) var(--ease-out);
}

.research-link:hover {
    border-color: var(--color-brand-gold);
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.research-link h4 {
    font-family: var(--font-heading);
    font-size: var(--text-base);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    margin-bottom: var(--space-2);
    transition: color var(--duration-fast);
}

.research-link:hover h4 {
    color: var(--color-brand-gold);
}

.research-link p {
    font-size: var(--text-sm);
    color: var(--color-text-tertiary);
    margin-bottom: 0;
}

/* ==========================================================================
   PATH ITEMS (Homepage navigation)
   ========================================================================== */

.path-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.path-item {
    display: block;
    background: var(--color-bg-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-6);
    text-decoration: none;
    transition: all var(--duration-base) var(--ease-out);
}

.path-item:hover {
    background: var(--color-brand-gold-subtle);
    border-color: var(--color-brand-gold);
    transform: translateX(4px);
}

.path-question {
    font-family: var(--font-body);
    font-size: var(--text-lg);
    font-style: italic;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-3);
    line-height: var(--leading-snug);
}

.path-answer {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-family: var(--font-ui);
    font-size: var(--text-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-brand-gold);
}

.path-answer::before {
    content: '→';
}

/* ==========================================================================
   COMMITMENT LIST
   ========================================================================== */

.commitment-list {
    border-top: 1px solid var(--color-border);
}

.commitment-list li {
    padding: var(--space-4) 0;
    border-bottom: 1px solid var(--color-border);
    font-size: var(--text-base);
}

.commitment-list li:last-child {
    border-bottom: none;
}

.commitment-list strong {
    color: var(--color-text-primary);
}

/* ==========================================================================
   ADDRESS BOX
   ========================================================================== */

.address-box {
    background: var(--color-bg-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-6);
    font-family: var(--font-ui);
    color: var(--color-text-secondary);
    line-height: var(--leading-loose);
}

.address-label {
    display: block;
    font-size: var(--text-xs);
    font-weight: var(--font-weight-semibold);
    text-transform: uppercase;
    letter-spacing: var(--tracking-widest);
    color: var(--color-brand-gold);
    margin-bottom: var(--space-3);
}

/* ==========================================================================
   TIMELINE
   ========================================================================== */

.timeline {
    position: relative;
    padding-left: var(--space-8);
}

.timeline::before {
    content: '';
    position: absolute;
    left: 5px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--color-border);
}

.timeline-item {
    position: relative;
    padding-bottom: var(--space-8);
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: calc(-1 * var(--space-8) + 1px);
    top: 4px;
    width: 10px;
    height: 10px;
    background: var(--color-bg-surface);
    border: 2px solid var(--color-border);
    border-radius: 50%;
}

.timeline-item.completed::before {
    background: var(--color-success);
    border-color: var(--color-success);
}

.timeline-item.active::before {
    background: var(--color-brand-gold);
    border-color: var(--color-brand-gold);
    box-shadow: 0 0 0 4px var(--color-brand-gold-subtle);
}

.timeline-date {
    font-family: var(--font-ui);
    font-size: var(--text-sm);
    font-weight: var(--font-weight-semibold);
    color: var(--color-brand-gold);
    margin-bottom: var(--space-2);
}

.timeline-title {
    font-family: var(--font-heading);
    font-size: var(--text-lg);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    margin-bottom: var(--space-2);
}

.timeline-content {
    color: var(--color-text-tertiary);
}

/* ==========================================================================
   DOWNLOAD CARD
   ========================================================================== */

.download-card {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    background: var(--color-bg-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-4);
    text-decoration: none;
    transition: all var(--duration-base) var(--ease-out);
}

.download-card:hover {
    border-color: var(--color-brand-gold);
    box-shadow: var(--shadow-md);
}

.download-icon {
    width: 48px;
    height: 48px;
    background: var(--color-bg-surface-elevated);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--text-xl);
    flex-shrink: 0;
}

.download-info {
    flex: 1;
    min-width: 0;
}

.download-title {
    font-family: var(--font-heading);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    margin-bottom: var(--space-1);
}

.download-meta {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
}

/* ==========================================================================
   COLLAB GRID
   ========================================================================== */

.collab-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-6);
}

.collab-item {
    background: var(--color-bg-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-6);
    text-align: center;
}

.collab-item h4 {
    font-size: var(--text-base);
    color: var(--color-brand-gold);
    margin-bottom: var(--space-2);
}

.collab-item p {
    font-size: var(--text-sm);
    color: var(--color-text-tertiary);
    margin-bottom: 0;
}

@media (max-width: 768px) {
    .collab-grid {
        grid-template-columns: 1fr;
    }
}

/* ==========================================================================
   RESPONSIVE ADJUSTMENTS
   ========================================================================== */

@media (max-width: 768px) {
    .card {
        padding: var(--space-4);
    }
    
    .card-featured {
        padding: var(--space-6);
    }
    
    .stat-number {
        font-size: var(--text-2xl);
    }
    
    .hypothesis-box {
        padding: var(--space-6);
    }
    
    .protocol-box {
        padding: var(--space-4);
    }
}

/* ==========================================================================
   ICON SYSTEM
   ========================================================================== */

/* Icon container base */
.icon {
    display: inline-block;
    width: 1.5rem;
    height: 1.5rem;
    flex-shrink: 0;
}

.icon svg {
    width: 100%;
    height: 100%;
    display: block;
}

/* Decorative icons should be hidden from screen readers */
.icon[aria-hidden="true"] {
    pointer-events: none;
}

/* Icon sizes */
.icon-sm {
    width: 1rem;
    height: 1rem;
}

.icon-md {
    width: 1.5rem;
    height: 1.5rem;
}

.icon-lg {
    width: 2rem;
    height: 2rem;
}

.icon-xl {
    width: 3rem;
    height: 3rem;
}

/* Icon in circular container */
.icon-container {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-full);
    padding: var(--space-3);
    background: var(--color-bg-surface);
    border: 1px solid var(--color-border);
    transition: all var(--duration-base) var(--ease-out);
}

.icon-container-sm {
    padding: var(--space-2);
}

.icon-container-lg {
    padding: var(--space-4);
}

/* Icon container variants */
.icon-container-primary {
    background: var(--color-brand-gold-subtle);
    border-color: var(--color-brand-gold);
    color: var(--color-brand-gold);
}

.icon-container-blue {
    background: var(--color-accent-blue-subtle);
    border-color: var(--color-accent-blue);
    color: var(--color-accent-blue);
}

.icon-container-success {
    background: var(--color-success-subtle);
    border-color: var(--color-success);
    color: var(--color-success);
}

.icon-container-warning {
    background: var(--color-warning-subtle);
    border-color: var(--color-warning);
    color: var(--color-warning);
}

.icon-container-error {
    background: var(--color-error-subtle);
    border-color: var(--color-error);
    color: var(--color-error);
}

/* Icon with text */
.icon-text {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
}

/* ==========================================================================
   ENHANCED STAT DISPLAY COMPONENTS
   ========================================================================== */

.stat-display {
    text-align: center;
}

.stat-display-number {
    font-family: var(--font-mono);
    font-size: var(--text-5xl);
    font-weight: var(--font-weight-bold);
    line-height: 1;
    color: var(--color-text-primary);
    margin-bottom: var(--space-2);
}

.stat-display-label {
    font-family: var(--font-ui);
    font-size: var(--text-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-tertiary);
    text-transform: uppercase;
    letter-spacing: var(--tracking-wider);
}

.stat-display-description {
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    margin-top: var(--space-2);
    max-width: 30ch;
    margin-left: auto;
    margin-right: auto;
}

/* Stat display with icon */
.stat-with-icon {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-3);
}

/* ==========================================================================
   PROGRESS INDICATORS
   ========================================================================== */

.progress-bar {
    width: 100%;
    height: 8px;
    background: var(--color-bg-surface);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.progress-bar-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--color-brand-gold), var(--color-brand-gold-light));
    border-radius: var(--radius-full);
    transition: width var(--duration-slow) var(--ease-out);
}

.progress-bar-fill-blue {
    background: linear-gradient(90deg, var(--color-accent-blue), var(--color-accent-blue-light));
}

.progress-bar-fill-success {
    background: linear-gradient(90deg, var(--color-success), var(--color-success-light));
}

/* Progress steps */
.progress-steps {
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: relative;
}

.progress-steps::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--color-border);
    transform: translateY(-50%);
    z-index: 0;
}

.progress-step {
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-2);
}

.progress-step-marker {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-full);
    background: var(--color-bg-surface);
    border: 2px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--text-sm);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-muted);
    transition: all var(--duration-base) var(--ease-out);
}

.progress-step-label {
    font-size: var(--text-xs);
    color: var(--color-text-tertiary);
    text-align: center;
}

.progress-step.completed .progress-step-marker {
    background: var(--color-brand-gold);
    border-color: var(--color-brand-gold);
    color: var(--color-text-inverse);
}

.progress-step.active .progress-step-marker {
    border-color: var(--color-brand-gold);
    color: var(--color-brand-gold);
    box-shadow: 0 0 0 4px var(--color-brand-gold-subtle);
}