/* ── Reset & Base ────────────────────────────────────────────────── */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg-deep: #07090f;
  --bg-surface: #0d1117;
  --bg-card: rgba(17, 24, 39, 0.7);
  --bg-card-solid: #111827;
  --bg-input: #0b1220;
  --border: rgba(56, 68, 102, 0.4);
  --border-focus: rgba(99, 130, 255, 0.5);
  --text: #e2e8f0;
  --text-dim: #8b9dc3;
  --text-muted: #4b5975;
  --accent: #6366f1;
  --accent-hover: #818cf8;
  --accent-glow: rgba(99, 102, 241, 0.25);
  --green: #10b981;
  --green-bg: rgba(16, 185, 129, 0.12);
  --amber: #f59e0b;
  --amber-bg: rgba(245, 158, 11, 0.12);
  --red: #ef4444;
  --radius: 14px;
  --radius-sm: 8px;
  --font: 'Inter', -apple-system, sans-serif;
  --mono: 'JetBrains Mono', 'Fira Code', monospace;
  --transition: 0.25s cubic-bezier(.4, 0, .2, 1);
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font);
  background: var(--bg-deep);
  color: var(--text);
  min-height: 100vh;
  overflow-x: hidden;
  line-height: 1.6;
}

/* ── Ambient Background ─────────────────────────────────────────── */
.bg-grid {
  position: fixed;
  inset: 0;
  z-index: 0;
  background-image:
    linear-gradient(rgba(99, 102, 241, .04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(99, 102, 241, .04) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none;
}

.bg-glow {
  position: fixed;
  border-radius: 50%;
  filter: blur(120px);
  opacity: 0.25;
  pointer-events: none;
  z-index: 0;
}

.bg-glow--1 {
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, #6366f1, transparent 70%);
  top: -200px;
  right: -100px;
  animation: float 18s ease-in-out infinite;
}

.bg-glow--2 {
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, #06b6d4, transparent 70%);
  bottom: -200px;
  left: -100px;
  animation: float 22s ease-in-out infinite reverse;
}

@keyframes float {

  0%,
  100% {
    transform: translate(0, 0) scale(1);
  }

  33% {
    transform: translate(30px, -40px) scale(1.05);
  }

  66% {
    transform: translate(-20px, 20px) scale(0.95);
  }
}

/* ── Container ──────────────────────────────────────────────────── */
.container {
  position: relative;
  z-index: 1;
  max-width: 820px;
  margin: 0 auto;
  padding: 40px 20px 80px;
}

/* ── Header ─────────────────────────────────────────────────────── */
.header {
  text-align: center;
  margin-bottom: 36px;
  animation: fadeInUp 0.6s ease-out;
}

.header__badge {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-glow);
  padding: 5px 14px;
  border-radius: 999px;
  margin-bottom: 14px;
}

.header h1 {
  font-size: clamp(28px, 5vw, 42px);
  font-weight: 800;
  background: linear-gradient(135deg, #e2e8f0 30%, #818cf8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
}

.header p {
  color: var(--text-dim);
  margin-top: 8px;
  font-size: 15px;
}

/* ── Card ───────────────────────────────────────────────────────── */
.card {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  margin-bottom: 20px;
  animation: fadeInUp 0.5s ease-out;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(18px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ── Labels ─────────────────────────────────────────────────────── */
label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-weight: 600;
  font-size: 14px;
  margin-bottom: 8px;
  color: var(--text);
}

.label-icon {
  font-size: 16px;
}

.label-hint {
  font-weight: 400;
  color: var(--text-muted);
  font-size: 12px;
}

/* ── Textarea ───────────────────────────────────────────────────── */
textarea {
  width: 100%;
  padding: 14px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-input);
  color: var(--text);
  font-family: var(--font);
  font-size: 14px;
  resize: vertical;
  transition: border-color var(--transition), box-shadow var(--transition);
  margin-bottom: 20px;
}

textarea:focus {
  outline: none;
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

/* ── Dropzone ───────────────────────────────────────────────────── */
.dropzone {
  border: 2px dashed var(--border);
  border-radius: var(--radius-sm);
  padding: 30px;
  text-align: center;
  cursor: pointer;
  transition: border-color var(--transition), background var(--transition);
  margin-bottom: 20px;
  position: relative;
  min-height: 120px;
}

.dropzone:hover,
.dropzone.dragover {
  border-color: var(--accent);
  background: rgba(99, 102, 241, 0.04);
}

.dropzone__content {
  pointer-events: none;
}

.dropzone__icon {
  font-size: 32px;
  margin-bottom: 6px;
  animation: bounce 2s ease-in-out infinite;
}

@keyframes bounce {

  0%,
  100% {
    transform: translateY(0);
  }

  50% {
    transform: translateY(-6px);
  }
}

.dropzone p {
  color: var(--text-dim);
  font-size: 14px;
  margin-bottom: 2px;
}

.dropzone__hint {
  font-size: 12px;
  color: var(--text-muted);
}

.dropzone__preview {
  display: none;
  max-width: 100%;
  max-height: 200px;
  border-radius: var(--radius-sm);
  margin-top: 12px;
  object-fit: contain;
}

.dropzone__preview.visible {
  display: block;
}

/* ── Buttons ────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  border: none;
  border-radius: var(--radius-sm);
  font-family: var(--font);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
}

.btn:active {
  transform: scale(0.97);
}

.btn--primary {
  width: 100%;
  background: linear-gradient(135deg, var(--accent), #4f46e5);
  color: #fff;
  box-shadow: 0 4px 20px var(--accent-glow);
}

.btn--primary:hover {
  background: linear-gradient(135deg, var(--accent-hover), #6366f1);
  box-shadow: 0 6px 28px rgba(99, 102, 241, 0.35);
}

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

.btn--proceed {
  background: var(--green);
  color: #fff;
  box-shadow: 0 4px 14px rgba(16, 185, 129, 0.25);
}

.btn--proceed:hover {
  background: #059669;
  box-shadow: 0 6px 20px rgba(16, 185, 129, 0.35);
}

.btn--retry {
  background: var(--amber);
  color: #1a1a2e;
  box-shadow: 0 4px 14px rgba(245, 158, 11, 0.2);
}

.btn--retry:hover {
  background: #d97706;
  box-shadow: 0 6px 20px rgba(245, 158, 11, 0.3);
}

.btn__loader {
  display: none;
}

.btn.loading .btn__text {
  display: none;
}

.btn.loading .btn__loader {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.spinner {
  display: inline-block;
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

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

/* ── Progress Stepper ───────────────────────────────────────────── */
.stepper-card {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px 28px;
  margin-bottom: 20px;
  animation: fadeInUp 0.5s ease-out;
}

.stepper {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
}

.stepper__step {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  min-width: 72px;
}

.stepper__step span {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  transition: color var(--transition);
}

.stepper__dot {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--bg-input);
  border: 2px solid var(--text-muted);
  transition: all var(--transition);
  position: relative;
}

.stepper__step.active .stepper__dot {
  border-color: var(--accent);
  background: var(--accent);
  box-shadow: 0 0 14px var(--accent-glow);
  animation: pulse-dot 1.5s ease-in-out infinite;
}

.stepper__step.active span {
  color: var(--accent);
}

.stepper__step.done .stepper__dot {
  border-color: var(--green);
  background: var(--green);
  box-shadow: none;
  animation: none;
}

.stepper__step.done span {
  color: var(--green);
}

@keyframes pulse-dot {

  0%,
  100% {
    box-shadow: 0 0 8px var(--accent-glow);
  }

  50% {
    box-shadow: 0 0 20px rgba(99, 102, 241, .5);
  }
}

.stepper__line {
  flex: 1;
  height: 2px;
  background: var(--text-muted);
  opacity: 0.3;
  margin: 0 4px;
  margin-bottom: 24px;
  transition: background var(--transition), opacity var(--transition);
}

.stepper__line.done {
  background: var(--green);
  opacity: 0.8;
}

/* ── HITL Card ──────────────────────────────────────────────────── */
.card--hitl {
  border-color: var(--amber);
  background: linear-gradient(135deg, rgba(245, 158, 11, .06), var(--bg-card));
  animation: fadeInUp 0.4s ease-out, glow-border 2s ease-in-out infinite;
}

@keyframes glow-border {

  0%,
  100% {
    box-shadow: 0 0 8px rgba(245, 158, 11, .15);
  }

  50% {
    box-shadow: 0 0 20px rgba(245, 158, 11, .25);
  }
}

.hitl-badge {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--amber);
  margin-bottom: 12px;
}

.card--hitl h2 {
  font-size: 20px;
  margin-bottom: 16px;
}

.hitl-content {
  background: var(--bg-input);
  border-radius: var(--radius-sm);
  padding: 16px;
  margin-bottom: 20px;
  font-size: 14px;
  line-height: 1.7;
  max-height: 300px;
  overflow-y: auto;
}

.hitl-content strong {
  color: var(--accent);
}

.hitl-actions {
  display: flex;
  gap: 12px;
}

.hitl-actions .btn {
  flex: 1;
  padding: 12px;
}

/* ── Results ────────────────────────────────────────────────────── */
.card--results h2 {
  margin-bottom: 20px;
  font-size: 22px;
}

.results-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
}

.results-header h2 {
  margin-bottom: 0;
}

.verify-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 700;
}

.verify-badge.high {
  background: var(--green-bg);
  color: var(--green);
}

.verify-badge.medium {
  background: var(--amber-bg);
  color: var(--amber);
}

.verify-badge.low {
  background: rgba(239, 68, 68, .12);
  color: var(--red);
}

.result-block {
  margin-bottom: 24px;
}

.result-block:last-child {
  margin-bottom: 0;
}

.result-block--context {
  border-left: 3px solid var(--accent);
  padding-left: 16px;
}

.result-body {
  background: var(--bg-input);
  border-radius: var(--radius-sm);
  padding: 20px 24px;
  font-size: 15px;
  line-height: 1.8;
  overflow-x: auto;
}

/* Math content typography */
.math-content h2 {
  font-size: 20px;
  font-weight: 700;
  margin: 0 0 16px;
  color: var(--accent-hover);
}

.math-content h3 {
  font-size: 16px;
  font-weight: 600;
  margin: 20px 0 10px;
  color: var(--text);
}

.math-content h4 {
  font-size: 14px;
  font-weight: 600;
  margin: 16px 0 8px;
  color: var(--text-dim);
}

.math-content p {
  margin-bottom: 10px;
}

.math-content ul,
.math-content ol {
  padding-left: 20px;
  margin-bottom: 10px;
}

.math-content li {
  margin-bottom: 4px;
}

.math-content code {
  font-family: var(--mono);
  font-size: 13px;
  background: rgba(99, 102, 241, .12);
  padding: 2px 6px;
  border-radius: 4px;
}

.math-content pre {
  background: #080c14;
  padding: 16px;
  border-radius: var(--radius-sm);
  overflow-x: auto;
  margin: 12px 0;
}

.math-content pre code {
  background: none;
  padding: 0;
}

/* KaTeX display math centered */
.math-content .katex-display {
  margin: 16px 0;
  text-align: center;
}

.math-content .katex {
  font-size: 1.1em;
}

.result-body pre {
  background: #080c14;
  padding: 14px;
  border-radius: var(--radius-sm);
  overflow-x: auto;
  margin: 8px 0;
}

.result-body pre code {
  background: none;
  padding: 0;
}

/* ── Logs ────────────────────────────────────────────────────────── */
.card--logs {
  padding: 0;
  overflow: hidden;
}

.logs-toggle {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 16px 24px;
  background: transparent;
  border: none;
  color: var(--text-dim);
  font-family: var(--font);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: color var(--transition);
}

.logs-toggle:hover {
  color: var(--text);
}

.logs-count {
  background: var(--accent-glow);
  color: var(--accent);
  font-size: 11px;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 999px;
  min-width: 22px;
  text-align: center;
}

.logs-chevron {
  margin-left: auto;
  transition: transform var(--transition);
  font-size: 12px;
}

.logs-chevron.open {
  transform: rotate(180deg);
}

.logs-body {
  padding: 0 24px 16px;
  max-height: 300px;
  overflow-y: auto;
}

.logs-list {
  list-style: none;
}

.logs-list li {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--text-dim);
  padding: 4px 0;
  border-bottom: 1px solid rgba(56, 68, 102, .15);
  line-height: 1.5;
}

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

/* ── Responsive ─────────────────────────────────────────────────── */
@media (max-width: 600px) {
  .container {
    padding: 20px 14px 60px;
  }

  .card {
    padding: 20px;
  }

  .stepper__step {
    min-width: 56px;
  }

  .stepper__step span {
    font-size: 10px;
  }

  .hitl-actions {
    flex-direction: column;
  }
}