/* ─── Markday App Styles ─────────────────────────────────────────── */
/* Matches landing page design language: cream, charcoal, warm tones  */

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

:root {
  --cream: #FAF6F1;
  --charcoal: #1A1A1A;
  --graphite: #3D3D3D;
  --warm-gray: #8A8278;
  --pencil: #5C554B;
  --accent: #D4622B;
  --accent-light: #F0A67A;
  --accent-bg: #FDF3EC;
  --paper: #F2EDE7;
  --line: #E0D8CE;
  --green: #2D8A4E;
  --green-bg: #EDF7F0;
  --red: #C0392B;
  --red-bg: #FDEDED;
}

body {
  font-family: 'DM Sans', sans-serif;
  background: var(--cream);
  color: var(--charcoal);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

/* Pencil-line texture */
body::before {
  content: '';
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background-image: repeating-linear-gradient(0deg, transparent, transparent 39px, var(--line) 39px, var(--line) 40px);
  opacity: 0.1;
  pointer-events: none;
  z-index: 0;
}

/* ─── Layout ─────────────────────────────────────────────────────── */
.app-container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

/* ─── Nav ────────────────────────────────────────────────────────── */
.app-nav {
  padding: 24px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--line);
  margin-bottom: 40px;
}

.app-nav .logo {
  font-family: 'Syne', sans-serif;
  font-weight: 800;
  font-size: 1.35rem;
  letter-spacing: -0.03em;
  color: var(--charcoal);
  text-decoration: none;
}

.app-nav .logo span { color: var(--accent); }

.nav-right {
  display: flex;
  align-items: center;
  gap: 20px;
}

.nav-streak {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  color: var(--warm-gray);
  font-weight: 500;
}

.nav-streak .fire { font-size: 1.1rem; }

.nav-user {
  font-size: 0.85rem;
  color: var(--warm-gray);
}

.nav-link {
  font-size: 0.85rem;
  color: var(--warm-gray);
  text-decoration: none;
  cursor: pointer;
  transition: color 0.15s;
}

.nav-link:hover { color: var(--accent); }

/* ─── Auth Screen ────────────────────────────────────────────────── */
.auth-screen {
  max-width: 400px;
  margin: 80px auto;
  text-align: center;
}

.auth-screen h1 {
  font-family: 'Syne', sans-serif;
  font-weight: 800;
  font-size: 2rem;
  letter-spacing: -0.03em;
  margin-bottom: 8px;
}

.auth-screen .subtitle {
  color: var(--warm-gray);
  margin-bottom: 36px;
  font-size: 1.05rem;
}

.auth-form {
  background: white;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 32px;
  text-align: left;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--graphite);
  margin-bottom: 6px;
}

.form-group input {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  font-size: 0.95rem;
  font-family: 'DM Sans', sans-serif;
  background: var(--cream);
  color: var(--charcoal);
  transition: border-color 0.15s;
}

.form-group input:focus {
  outline: none;
  border-color: var(--accent);
  background: white;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border: none;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 500;
  font-family: 'DM Sans', sans-serif;
  cursor: pointer;
  transition: all 0.15s;
  text-decoration: none;
}

.btn-primary {
  background: var(--charcoal);
  color: white;
  width: 100%;
}

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

.btn-accent {
  background: var(--accent);
  color: white;
}

.btn-accent:hover { background: #C0571F; }

.btn-outline {
  background: transparent;
  border: 1px solid var(--line);
  color: var(--graphite);
}

.btn-outline:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.auth-toggle {
  margin-top: 20px;
  font-size: 0.9rem;
  color: var(--warm-gray);
}

.auth-toggle a {
  color: var(--accent);
  cursor: pointer;
  text-decoration: none;
  font-weight: 500;
}

.error-msg {
  background: var(--red-bg);
  color: var(--red);
  padding: 10px 14px;
  border-radius: 8px;
  font-size: 0.85rem;
  margin-bottom: 16px;
  display: none;
}

.error-msg.visible { display: block; }

/* ─── Lesson List ────────────────────────────────────────────────── */
.page-header {
  margin-bottom: 40px;
}

.page-header h1 {
  font-family: 'Syne', sans-serif;
  font-weight: 800;
  font-size: 2.2rem;
  letter-spacing: -0.03em;
  margin-bottom: 8px;
}

.page-header p {
  color: var(--warm-gray);
  font-size: 1.05rem;
  line-height: 1.6;
}

/* Progress Bar */
.progress-overview {
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 24px;
  background: white;
  border: 1px solid var(--line);
  border-radius: 12px;
  margin-bottom: 32px;
}

.progress-bar-wrap {
  flex: 1;
}

.progress-label {
  font-size: 0.85rem;
  color: var(--warm-gray);
  margin-bottom: 8px;
  display: flex;
  justify-content: space-between;
}

.progress-bar {
  height: 8px;
  background: var(--paper);
  border-radius: 4px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: var(--accent);
  border-radius: 4px;
  transition: width 0.5s ease;
}

.progress-stats {
  display: flex;
  gap: 24px;
}

.stat {
  text-align: center;
}

.stat-value {
  font-family: 'Syne', sans-serif;
  font-weight: 800;
  font-size: 1.5rem;
  color: var(--charcoal);
}

.stat-label {
  font-size: 0.75rem;
  color: var(--warm-gray);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* Lesson Cards */
.lesson-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 20px;
  margin-bottom: 60px;
}

.lesson-card {
  background: white;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 28px;
  cursor: pointer;
  transition: all 0.2s;
  position: relative;
  overflow: hidden;
}

.lesson-card:hover {
  border-color: var(--accent);
  box-shadow: 0 4px 20px rgba(212, 98, 43, 0.08);
  transform: translateY(-2px);
}

.lesson-card.completed {
  border-color: var(--green);
  background: var(--green-bg);
}

.lesson-card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 12px;
}

.lesson-number {
  font-family: 'Syne', sans-serif;
  font-weight: 800;
  font-size: 2.5rem;
  line-height: 1;
  color: var(--line);
  letter-spacing: -0.04em;
}

.lesson-card.completed .lesson-number { color: #A8D5BA; }

.lesson-badge {
  font-size: 0.7rem;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 20px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.badge-time {
  background: var(--paper);
  color: var(--warm-gray);
}

.badge-done {
  background: var(--green);
  color: white;
}

.lesson-card h3 {
  font-family: 'Syne', sans-serif;
  font-weight: 700;
  font-size: 1.15rem;
  margin-bottom: 8px;
  letter-spacing: -0.01em;
}

.lesson-card p {
  font-size: 0.9rem;
  color: var(--graphite);
  line-height: 1.55;
}

/* ─── Lesson Detail ──────────────────────────────────────────────── */
.lesson-detail {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  margin-bottom: 60px;
}

.lesson-content {
  order: 1;
}

.lesson-sidebar {
  order: 2;
  position: sticky;
  top: 24px;
  align-self: start;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  color: var(--warm-gray);
  text-decoration: none;
  margin-bottom: 24px;
  cursor: pointer;
  transition: color 0.15s;
}

.back-link:hover { color: var(--accent); }

.lesson-content h1 {
  font-family: 'Syne', sans-serif;
  font-weight: 800;
  font-size: 2rem;
  letter-spacing: -0.03em;
  margin-bottom: 16px;
}

.lesson-meta {
  display: flex;
  gap: 16px;
  margin-bottom: 28px;
}

.lesson-meta-item {
  font-size: 0.85rem;
  color: var(--warm-gray);
  display: flex;
  align-items: center;
  gap: 4px;
}

.lesson-instructions {
  font-size: 0.95rem;
  line-height: 1.75;
  color: var(--graphite);
}

.lesson-instructions strong {
  color: var(--charcoal);
  font-weight: 500;
}

.lesson-instructions p {
  margin-bottom: 12px;
}

.lesson-tips {
  margin-top: 28px;
  padding: 20px;
  background: var(--accent-bg);
  border-radius: 10px;
  border-left: 3px solid var(--accent);
}

.lesson-tips h4 {
  font-family: 'Syne', sans-serif;
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--accent);
  margin-bottom: 8px;
}

.lesson-tips p {
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--pencil);
}

/* Reference Image */
.reference-card {
  background: white;
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
  margin-bottom: 20px;
}

.reference-card-header {
  padding: 16px 20px;
  border-bottom: 1px solid var(--line);
  font-family: 'Syne', sans-serif;
  font-weight: 600;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--warm-gray);
}

.reference-card-body {
  padding: 20px;
  display: flex;
  justify-content: center;
}

.reference-card-body svg {
  width: 100%;
  max-width: 360px;
  height: auto;
}

/* Upload Area */
.upload-card {
  background: white;
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
}

.upload-card-header {
  padding: 16px 20px;
  border-bottom: 1px solid var(--line);
  font-family: 'Syne', sans-serif;
  font-weight: 600;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--warm-gray);
}

.upload-area {
  padding: 32px 20px;
  text-align: center;
}

.upload-dropzone {
  border: 2px dashed var(--line);
  border-radius: 10px;
  padding: 40px 20px;
  cursor: pointer;
  transition: all 0.2s;
  position: relative;
}

.upload-dropzone:hover {
  border-color: var(--accent);
  background: var(--accent-bg);
}

.upload-dropzone.has-image {
  border-style: solid;
  border-color: var(--green);
  padding: 12px;
}

.upload-icon {
  font-size: 2.5rem;
  margin-bottom: 12px;
  opacity: 0.5;
}

.upload-text {
  font-size: 0.95rem;
  color: var(--graphite);
  margin-bottom: 4px;
}

.upload-hint {
  font-size: 0.8rem;
  color: var(--warm-gray);
}

.upload-preview {
  max-width: 100%;
  max-height: 300px;
  border-radius: 6px;
  object-fit: contain;
}

.upload-actions {
  padding: 0 20px 20px;
  display: flex;
  gap: 10px;
}

.upload-actions .btn { flex: 1; }

/* ─── Feedback Display ───────────────────────────────────────────── */
.feedback-section {
  margin-top: 20px;
}

.feedback-card {
  background: white;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 28px;
  margin-bottom: 20px;
}

.feedback-card h3 {
  font-family: 'Syne', sans-serif;
  font-weight: 700;
  font-size: 1.15rem;
  margin-bottom: 20px;
  color: var(--charcoal);
}

.score-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-bottom: 24px;
}

.score-item {
  text-align: center;
  padding: 16px 12px;
  background: var(--paper);
  border-radius: 10px;
}

.score-ring {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 10px;
  font-family: 'Syne', sans-serif;
  font-weight: 800;
  font-size: 1.4rem;
  color: white;
  position: relative;
}

.score-ring::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: conic-gradient(
    var(--score-color, var(--accent)) calc(var(--score-pct, 60) * 3.6deg),
    var(--line) 0deg
  );
  z-index: 0;
}

.score-ring::after {
  content: '';
  position: absolute;
  inset: 5px;
  border-radius: 50%;
  background: var(--paper);
  z-index: 1;
}

.score-ring span {
  position: relative;
  z-index: 2;
  color: var(--charcoal);
}

.score-category {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--warm-gray);
  font-weight: 500;
}

.feedback-text {
  margin-bottom: 20px;
}

.feedback-text h4 {
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 6px;
  color: var(--charcoal);
}

.feedback-text p {
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--graphite);
}

.corrections-list {
  list-style: none;
  margin-bottom: 20px;
}

.corrections-list h4 {
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 10px;
  color: var(--charcoal);
}

.correction-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 10px 14px;
  background: var(--accent-bg);
  border-radius: 8px;
  margin-bottom: 8px;
  font-size: 0.9rem;
  line-height: 1.5;
  color: var(--pencil);
}

.correction-item::before {
  content: '→';
  color: var(--accent);
  font-weight: 700;
  flex-shrink: 0;
  margin-top: 1px;
}

.encouragement {
  padding: 16px 20px;
  background: var(--green-bg);
  border-radius: 10px;
  border-left: 3px solid var(--green);
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--graphite);
  font-style: italic;
}

/* ─── Loading ────────────────────────────────────────────────────── */
.loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 60px 20px;
  color: var(--warm-gray);
}

.spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--line);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin-bottom: 16px;
}

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

.loading-text {
  font-size: 0.95rem;
  font-weight: 500;
}

.analyzing-text {
  font-size: 0.85rem;
  color: var(--warm-gray);
  margin-top: 4px;
}

/* ─── Empty State ────────────────────────────────────────────────── */
.empty-state {
  text-align: center;
  padding: 60px 20px;
  color: var(--warm-gray);
}

.empty-state .icon {
  font-size: 3rem;
  margin-bottom: 16px;
  opacity: 0.4;
}

/* ─── Mobile ─────────────────────────────────────────────────────── */
@media (max-width: 768px) {
  .lesson-detail {
    grid-template-columns: 1fr;
  }

  .lesson-content { order: 1; }
  .lesson-sidebar { order: 2; position: static; }

  .score-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
  }

  .score-ring {
    width: 52px;
    height: 52px;
    font-size: 1.1rem;
  }

  .progress-overview {
    flex-direction: column;
    align-items: stretch;
    gap: 16px;
  }

  .progress-stats {
    justify-content: center;
  }

  .lesson-grid {
    grid-template-columns: 1fr;
  }

  .page-header h1 {
    font-size: 1.8rem;
  }

  .nav-user { display: none; }
}