/* ============================================================
   AUDIT TRAIL — Screen-specific styles
   Inherits variables from style.css
   ============================================================ */

/* Force dark theme for this page */
html { color-scheme: dark; }

/* ============================================================
   NAV
   ============================================================ */
.at-nav {
  position: sticky; top: 0; z-index: 100;
  background: color-mix(in srgb, var(--color-bg) 85%, transparent);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-divider);
}
.at-nav-inner {
  max-width: 900px;
  margin: 0 auto;
  padding: var(--space-4) var(--space-8);
  display: flex; align-items: center; justify-content: space-between;
}
.at-nav-brand {
  display: flex; align-items: center; gap: var(--space-3);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-lg);
  letter-spacing: -0.01em;
  color: var(--color-text);
}
.at-nav-wordmark { color: var(--color-text); }

.at-back-btn {
  display: inline-flex; align-items: center; gap: var(--space-2);
  font-size: var(--text-sm);
  font-weight: 600;
  font-family: var(--font-body);
  color: var(--color-text-muted);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: all var(--transition-interactive);
}
.at-back-btn:hover {
  color: var(--color-text);
  border-color: var(--color-primary);
  background: var(--color-surface-offset);
}

/* ============================================================
   HERO
   ============================================================ */
.at-hero {
  border-bottom: 1px solid var(--color-divider);
  padding: clamp(var(--space-10), 6vw, var(--space-20)) var(--space-8) var(--space-12);
  background: linear-gradient(180deg,
    color-mix(in srgb, var(--color-primary) 4%, var(--color-bg)) 0%,
    var(--color-bg) 100%
  );
}
.at-container {
  max-width: 900px;
  margin: 0 auto;
}
.at-hero-eyebrow {
  display: flex; align-items: center; gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-primary);
  letter-spacing: 0.06em;
  margin-bottom: var(--space-4);
}
.at-status-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--color-success);
  box-shadow: 0 0 0 0 var(--color-success);
  animation: pulse-dot 2.2s infinite;
  flex-shrink: 0;
}
@keyframes pulse-dot {
  0%   { box-shadow: 0 0 0 0 rgba(46, 204, 138, 0.5); }
  70%  { box-shadow: 0 0 0 7px rgba(46, 204, 138, 0); }
  100% { box-shadow: 0 0 0 0 rgba(46, 204, 138, 0); }
}
.at-hero-title {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.05;
  color: var(--color-text);
  margin-bottom: var(--space-4);
}
.at-hero-sub {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  margin-bottom: var(--space-8);
  max-width: 52ch;
}
.at-hero-meta {
  display: flex; flex-wrap: wrap; gap: var(--space-3);
}
.at-meta-chip {
  display: flex; align-items: center; gap: var(--space-2);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  padding: var(--space-2) var(--space-4);
}
.at-meta-label {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  font-weight: 500;
}
.at-meta-label::after { content: ':'; margin-right: 2px; }
.at-meta-value {
  font-size: var(--text-xs);
  font-weight: 700;
  color: var(--color-text);
  font-family: var(--font-display);
}
.at-meta-approved {
  color: var(--color-success);
}

/* ============================================================
   MAIN / TIMELINE
   ============================================================ */
.at-main {
  padding: var(--space-12) var(--space-8) var(--space-8);
}

/* ============================================================
   STEP
   ============================================================ */
.at-step {
  display: grid;
  grid-template-columns: 32px 1fr;
  gap: 0 var(--space-5);
  position: relative;
}
.at-step-last .at-step-line { display: none; }

/* Spine */
.at-step-spine {
  display: flex; flex-direction: column; align-items: center;
  padding-top: 2px;
}
.at-step-node {
  width: 32px; height: 32px;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
  z-index: 1;
  transition: all var(--transition-interactive);
}
.at-node-complete {
  background: var(--color-success);
  border: 2px solid var(--color-success);
  color: white;
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--color-success) 20%, transparent);
}
.at-node-decision {
  background: var(--color-primary);
  border: 2px solid var(--color-primary);
  color: var(--color-bg);
  box-shadow: 0 0 0 4px var(--color-primary-glow);
}
.at-step-line {
  flex: 1;
  width: 2px;
  background: linear-gradient(180deg, var(--color-success) 0%, var(--color-border) 100%);
  margin: var(--space-2) 0;
  min-height: var(--space-6);
}

/* Body */
.at-step-body {
  padding-bottom: var(--space-8);
  min-width: 0;
}
.at-step-last .at-step-body { padding-bottom: var(--space-4); }

.at-step-header {
  display: flex; align-items: center; justify-content: space-between;
  cursor: pointer;
  padding: var(--space-4) var(--space-5);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  gap: var(--space-4);
  transition: border-color var(--transition-interactive), background var(--transition-interactive);
  user-select: none;
}
.at-step-header:hover {
  border-color: color-mix(in srgb, var(--color-primary) 50%, var(--color-border));
  background: var(--color-surface-offset);
}
.at-step-body.is-open .at-step-header {
  border-radius: var(--radius-xl) var(--radius-xl) 0 0;
  border-bottom-color: var(--color-divider);
}
.at-step-left { min-width: 0; }
.at-step-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-lg);
  color: var(--color-text);
  letter-spacing: -0.01em;
}
.at-step-timestamp {
  display: flex; align-items: center; gap: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  margin-top: var(--space-1);
}
.at-step-right {
  display: flex; align-items: center; gap: var(--space-3);
  flex-shrink: 0;
}

/* Badges */
.at-badge {
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  white-space: nowrap;
}
.at-badge-complete { background: var(--color-success-bg); color: var(--color-success); }
.at-badge-approved { background: var(--color-success-bg); color: var(--color-success); }
.at-badge-warn { background: var(--color-warning-bg); color: var(--color-warning); }
.at-badge-fail { background: var(--color-error-bg); color: var(--color-error); }
.at-badge-sm { font-size: 0.65rem; padding: 3px 8px; }

/* Expand button */
.at-expand-btn {
  width: 32px; height: 32px;
  border-radius: var(--radius-md);
  display: flex; align-items: center; justify-content: center;
  color: var(--color-text-muted);
  background: var(--color-surface-offset);
  border: 1px solid var(--color-border);
  cursor: pointer;
  transition: all var(--transition-interactive);
  flex-shrink: 0;
}
.at-expand-btn:hover { color: var(--color-primary); border-color: var(--color-primary); }
.at-expand-btn svg { transition: transform var(--transition-interactive); }
.at-step-body.is-open .at-expand-btn svg { transform: rotate(180deg); }

/* ============================================================
   EXPANDABLE DETAIL
   ============================================================ */
.at-step-detail {
  display: none;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-top: none;
  border-radius: 0 0 var(--radius-xl) var(--radius-xl);
  padding: var(--space-6) var(--space-6) var(--space-5);
  animation: detail-in 0.2s ease;
}
@keyframes detail-in {
  from { opacity: 0; transform: translateY(-4px); }
  to   { opacity: 1; transform: translateY(0); }
}
.at-step-body.is-open .at-step-detail { display: block; }

.at-detail-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-6);
}
.at-detail-col {}
.at-detail-section {}
.at-full-width { grid-column: 1 / -1; }

.at-ds-label {
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-faint);
  margin-bottom: var(--space-3);
}
.at-ds-content { display: flex; flex-direction: column; gap: var(--space-2); }

.at-kv-row {
  display: flex; justify-content: space-between; align-items: center;
  gap: var(--space-4);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  background: var(--color-surface-2);
  border: 1px solid var(--color-divider);
}
.at-kv-key {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  font-weight: 500;
  flex-shrink: 0;
}
.at-kv-val {
  font-size: var(--text-xs);
  color: var(--color-text);
  font-weight: 600;
  text-align: right;
}
.at-mono { font-family: var(--font-mono); font-weight: 400; font-size: 0.7rem; }
.at-val-pass { color: var(--color-success); }
.at-val-warn { color: var(--color-warning); }
.at-val-fail { color: var(--color-error); }

/* Criteria list */
.at-criteria-list { display: flex; flex-direction: column; gap: var(--space-2); }
.at-criteria-item {
  display: flex; align-items: flex-start; gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  line-height: 1.5;
  border-left: 3px solid transparent;
}
.at-c-met { background: var(--color-success-bg); color: var(--color-text-muted); border-left-color: var(--color-success); }
.at-c-warn { background: var(--color-warning-bg); color: var(--color-text-muted); border-left-color: var(--color-warning); }
.at-c-fail { background: var(--color-error-bg); color: var(--color-text-muted); border-left-color: var(--color-error); }
.at-c-icon { font-size: 0.9rem; flex-shrink: 0; margin-top: 1px; }
.at-c-met .at-c-icon { color: var(--color-success); }
.at-c-warn .at-c-icon { color: var(--color-warning); }
.at-c-fail .at-c-icon { color: var(--color-error); }

/* Note block */
.at-note-block {
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-left: 3px solid var(--color-primary);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  padding: var(--space-4) var(--space-5);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.7;
  max-width: none;
}

/* Score breakdown */
.at-score-breakdown {
  display: flex; flex-direction: column; gap: var(--space-3);
}
.at-score-row, .at-score-total-row {
  display: grid; grid-template-columns: 180px 1fr 44px;
  align-items: center; gap: var(--space-4);
}
.at-score-total-row {
  padding-top: var(--space-3);
  border-top: 1px solid var(--color-divider);
  margin-top: var(--space-1);
}
.at-score-domain { font-size: var(--text-sm); color: var(--color-text-muted); }
.at-score-bar-wrap { height: 8px; background: var(--color-surface-offset); border-radius: var(--radius-full); overflow: hidden; }
.at-score-bar { height: 100%; border-radius: var(--radius-full); transition: width 1.2s cubic-bezier(0.16, 1, 0.3, 1); }
.at-bar-high { background: var(--color-success); }
.at-bar-medium { background: var(--color-warning); }
.at-bar-low { background: var(--color-error); }
.at-score-val { font-family: var(--font-mono); font-size: var(--text-sm); font-weight: 600; text-align: right; }

/* ============================================================
   EXPLAIN BUTTON
   ============================================================ */
.at-explain-wrap {
  margin-top: var(--space-6);
  display: flex; justify-content: flex-start;
}
.at-explain-btn {
  display: inline-flex; align-items: center; gap: var(--space-3);
  background: linear-gradient(135deg,
    color-mix(in srgb, var(--color-primary) 15%, var(--color-surface)),
    color-mix(in srgb, var(--color-primary) 8%, var(--color-surface))
  );
  color: var(--color-primary);
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 700;
  padding: var(--space-4) var(--space-8);
  border-radius: var(--radius-xl);
  border: 1.5px solid color-mix(in srgb, var(--color-primary) 40%, var(--color-border));
  cursor: pointer;
  transition: all var(--transition-interactive);
  letter-spacing: -0.01em;
}
.at-explain-btn:hover {
  background: linear-gradient(135deg,
    color-mix(in srgb, var(--color-primary) 22%, var(--color-surface)),
    color-mix(in srgb, var(--color-primary) 14%, var(--color-surface))
  );
  border-color: var(--color-primary);
  box-shadow: 0 0 0 4px var(--color-primary-glow), var(--shadow-md);
  transform: translateY(-1px);
}
.at-explain-btn:active { transform: translateY(0); }
.at-explain-btn.is-open {
  background: var(--color-primary);
  color: var(--color-bg);
  border-color: var(--color-primary);
}

/* ============================================================
   DECISION TRACE PANEL
   ============================================================ */
.at-trace-panel {
  display: none;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-2xl);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  margin-top: var(--space-5);
  animation: trace-in 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}
.at-trace-panel.is-visible {
  display: block;
}
@keyframes trace-in {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}
.at-trace-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: var(--space-5) var(--space-6);
  background: color-mix(in srgb, var(--color-primary) 8%, var(--color-surface));
  border-bottom: 1px solid var(--color-border);
}
.at-trace-title {
  display: flex; align-items: center; gap: var(--space-3);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--text-lg);
  letter-spacing: -0.01em;
  color: var(--color-text);
}
.at-trace-title svg { color: var(--color-primary); }
.at-trace-close {
  width: 32px; height: 32px;
  border-radius: var(--radius-md);
  display: flex; align-items: center; justify-content: center;
  color: var(--color-text-muted);
  background: var(--color-surface-offset);
  border: 1px solid var(--color-border);
  cursor: pointer;
  transition: all var(--transition-interactive);
}
.at-trace-close:hover { color: var(--color-error); border-color: var(--color-error); }

.at-trace-body {
  padding: var(--space-6);
  display: flex; flex-direction: column; gap: var(--space-8);
}
.at-trace-section {}
.at-trace-section-label {
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-faint);
  margin-bottom: var(--space-4);
}

/* Linked Steps */
.at-trace-links { display: flex; flex-direction: column; gap: var(--space-3); }
.at-trace-link {
  display: flex; align-items: center; gap: var(--space-4);
  padding: var(--space-4) var(--space-5);
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-interactive);
}
.at-trace-link:hover { border-color: var(--color-primary); background: var(--color-surface-offset); }
.at-tl-node {
  width: 28px; height: 28px; border-radius: 50%;
  background: var(--color-primary-highlight);
  border: 1.5px solid color-mix(in srgb, var(--color-primary) 40%, transparent);
  display: flex; align-items: center; justify-content: center;
  font-size: var(--text-xs); font-weight: 800;
  font-family: var(--font-display);
  color: var(--color-primary); flex-shrink: 0;
}
.at-tl-content { flex: 1; min-width: 0; }
.at-tl-title { font-weight: 700; font-size: var(--text-sm); color: var(--color-text); }
.at-tl-desc { font-size: var(--text-xs); color: var(--color-text-muted); margin-top: 2px; }

/* Dependencies */
.at-dep-grid { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-3); }
.at-dep-item {
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  display: flex; flex-direction: column; gap: var(--space-1);
}
.at-dep-name { font-family: var(--font-mono); font-size: var(--text-xs); font-weight: 500; color: var(--color-text); }
.at-dep-desc { font-size: var(--text-xs); color: var(--color-text-muted); }
.at-dep-status { margin-top: var(--space-2); font-size: 0.65rem; font-weight: 700; letter-spacing: 0.06em; text-transform: uppercase; align-self: flex-start; padding: 2px 8px; border-radius: var(--radius-full); }
.at-dep-active { background: var(--color-success-bg); color: var(--color-success); }

/* Justification */
.at-justification { display: flex; flex-direction: column; gap: var(--space-4); }
.at-just-block {
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
}
.at-just-heading {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-base);
  color: var(--color-text);
  margin-bottom: var(--space-3);
}
.at-just-block p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.7;
  max-width: none;
}
.at-just-block strong { color: var(--color-text); font-weight: 700; }

/* Trace footer */
.at-trace-footer {
  display: flex; align-items: center; justify-content: space-between;
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-divider);
  flex-wrap: wrap; gap: var(--space-4);
}
.at-trace-meta {
  display: flex; align-items: center; gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 720px) {
  .at-nav-inner { padding: var(--space-4); }
  .at-hero { padding: var(--space-8) var(--space-5) var(--space-10); }
  .at-main { padding: var(--space-8) var(--space-5); }
  .at-hero-title { font-size: clamp(2rem, 8vw, 3rem); }
  .at-detail-grid { grid-template-columns: 1fr; }
  .at-score-row, .at-score-total-row { grid-template-columns: 130px 1fr 36px; gap: var(--space-3); }
  .at-dep-grid { grid-template-columns: 1fr; }
  .at-step { grid-template-columns: 28px 1fr; gap: 0 var(--space-4); }
  .at-step-node { width: 28px; height: 28px; }
  .at-trace-footer { flex-direction: column; align-items: flex-start; }
}