:root {
  --ink: #1B2A4A;
  --ink-soft: #5C6E8C;
  --paper: #FBF6EC;
  --paper-raised: #FFFFFF;
  --accent: #2F6FED;
  --accent-deep: #1D4FC4;
  --correction: #E5484D;
  --correction-bg: #FDEAEA;
  --praise: #17A673;
  --praise-bg: #E1F7EE;
  --line: #E8E1D3;
  --surface-strong: #2F6FED;
  --on-surface-strong: #FFFFFF;
  --radius: 14px;
  --font-display: 'Space Grotesk', sans-serif;
  --font-body: 'Inter', sans-serif;
}

body[data-theme="light-blue"] {
  --ink: #143A5C;
  --ink-soft: #4779A0;
  --paper: #E6F5FF;
  --paper-raised: #FFFFFF;
  --accent: #29B6F6;
  --accent-deep: #039BE5;
  --correction: #E5484D;
  --correction-bg: #FDEAEA;
  --praise: #17A673;
  --praise-bg: #E1F7EE;
  --line: #C6E7FA;
  --surface-strong: #039BE5;
  --on-surface-strong: #FFFFFF;
}

body[data-theme="navy"] {
  --ink: #0B1B33;
  --ink-soft: #3E5A80;
  --paper: #EAEFF9;
  --paper-raised: #FFFFFF;
  --accent: #3D5AFE;
  --accent-deep: #2941D6;
  --correction: #E5484D;
  --correction-bg: #FDEAEA;
  --praise: #17A673;
  --praise-bg: #E1F7EE;
  --line: #D2D9EE;
  --surface-strong: #2941D6;
  --on-surface-strong: #FFFFFF;
}

body[data-theme="violet"] {
  --ink: #2A1B4D;
  --ink-soft: #6B5A8E;
  --paper: #F4F0FB;
  --paper-raised: #FFFFFF;
  --accent: #8B5CF6;
  --accent-deep: #6D28D9;
  --correction: #E5484D;
  --correction-bg: #FDEAEA;
  --praise: #17A673;
  --praise-bg: #E1F7EE;
  --line: #E1D6F7;
  --surface-strong: #6D28D9;
  --on-surface-strong: #FFFFFF;
}

body[data-theme="dark"] {
  --ink: #EAF1FB;
  --ink-soft: #9FB6D1;
  --paper: #0B1626;
  --paper-raised: #142236;
  --accent: #4FC3F7;
  --accent-deep: #29B6F6;
  --correction: #FF6E6E;
  --correction-bg: #3D2020;
  --praise: #4ADE9A;
  --praise-bg: #123024;
  --line: #21324A;
  --surface-strong: #2979FF;
  --on-surface-strong: #FFFFFF;
}

body[data-theme="green"] {
  --ink: #0F3D2E;
  --ink-soft: #3F7360;
  --paper: #EAFBF3;
  --paper-raised: #FFFFFF;
  --accent: #22C55E;
  --accent-deep: #16A34A;
  --correction: #E5484D;
  --correction-bg: #FDEAEA;
  --praise: #17A673;
  --praise-bg: #E1F7EE;
  --line: #CDEEDD;
  --surface-strong: #16A34A;
  --on-surface-strong: #FFFFFF;
}

body[data-theme="pink"] {
  --ink: #4A1030;
  --ink-soft: #8A4A6C;
  --paper: #FFF0F6;
  --paper-raised: #FFFFFF;
  --accent: #EC4899;
  --accent-deep: #DB2777;
  --correction: #E5484D;
  --correction-bg: #FDEAEA;
  --praise: #17A673;
  --praise-bg: #E1F7EE;
  --line: #FAD3E7;
  --surface-strong: #DB2777;
  --on-surface-strong: #FFFFFF;
}

body[data-theme="yellow"] {
  --ink: #4A3A00;
  --ink-soft: #8A7530;
  --paper: #FFFBEA;
  --paper-raised: #FFFFFF;
  --accent: #F5B700;
  --accent-deep: #B87700;
  --correction: #E5484D;
  --correction-bg: #FDEAEA;
  --praise: #17A673;
  --praise-bg: #E1F7EE;
  --line: #F5E6B8;
  --surface-strong: #B87700;
  --on-surface-strong: #FFFFFF;
}

body[data-theme="red"] {
  --ink: #4A0E0E;
  --ink-soft: #8A4A4A;
  --paper: #FFF3F0;
  --paper-raised: #FFFFFF;
  --accent: #EF4444;
  --accent-deep: #DC2626;
  --correction: #EA580C;
  --correction-bg: #FFF0E6;
  --praise: #17A673;
  --praise-bg: #E1F7EE;
  --line: #FBD5D0;
  --surface-strong: #DC2626;
  --on-surface-strong: #FFFFFF;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: var(--font-body);
  background: var(--paper);
  color: var(--ink);
}

.hidden { display: none !important; }

h1, h2, h3 { font-family: var(--font-display); color: var(--ink); margin: 0; }
.muted { color: var(--ink-soft); font-size: 14px; }

/* ---------- Auth ---------- */
.auth-wrap {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(160deg, var(--ink) 0%, var(--accent-deep) 60%, var(--accent) 140%);
  padding: 24px;
}

.auth-card {
  background: var(--paper-raised);
  border-radius: 20px;
  padding: 40px 36px;
  width: 100%;
  max-width: 400px;
  box-shadow: 0 20px 60px rgba(27, 35, 64, 0.35);
}

.brand { text-align: center; margin-bottom: 28px; }
.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 52px; height: 52px;
  border-radius: 14px;
  overflow: hidden;
  margin-bottom: 12px;
}
.brand-mark.small { width: 28px; height: 28px; border-radius: 8px; margin: 0; }
.brand h1 { font-size: 24px; }
.brand-sub { color: var(--ink-soft); font-size: 13px; margin-top: 6px; }
.btn-install {
  margin-top: 16px;
  background: var(--paper);
  color: var(--ink);
  border: 1.5px solid var(--line);
  border-radius: 10px;
  padding: 10px 18px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  font-family: var(--font-body);
}
.btn-install:hover { border-color: var(--accent-deep); color: var(--accent-deep); }

.auth-form { display: flex; flex-direction: column; gap: 14px; }
.auth-form label { font-size: 13px; font-weight: 500; color: var(--ink-soft); display: flex; flex-direction: column; gap: 6px; }
.auth-form input {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 11px 13px;
  font-size: 14px;
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--paper-raised);
}
.auth-form input:focus { outline: 2px solid var(--accent); outline-offset: 1px; }

.form-error { color: var(--correction); font-size: 13px; min-height: 16px; margin: 0; }

.btn-primary {
  background: var(--surface-strong);
  color: var(--on-surface-strong);
  border: none;
  border-radius: 10px;
  padding: 12px 20px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  font-family: var(--font-body);
  transition: transform 0.1s ease, background 0.15s ease;
}
.btn-primary:hover { background: var(--accent-deep); filter: brightness(1.08); }
.btn-primary:active { transform: scale(0.98); }
.btn-wide { width: 100%; }

.switch-form { text-align: center; font-size: 13px; color: var(--ink-soft); margin: 4px 0 0; }
.switch-form a { color: var(--accent-deep); font-weight: 600; text-decoration: none; }

/* ---------- App shell ---------- */
.app-shell { min-height: 100vh; display: flex; flex-direction: column; }

.topbar {
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 14px 28px;
  background: var(--paper-raised);
  border-bottom: 1px solid var(--line);
}
.brand-mini { display: flex; align-items: center; gap: 10px; font-family: var(--font-display); font-weight: 700; }
.topbar-username {
  font-size: 13px;
  font-weight: 600;
  color: var(--ink-soft);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 140px;
}
.tabs { display: flex; gap: 6px; flex: 1; }
.tab-btn {
  background: transparent;
  border: none;
  padding: 8px 14px;
  border-radius: 8px;
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 500;
  color: var(--ink-soft);
  cursor: pointer;
}
.tab-btn:hover { background: var(--paper); }
.tab-btn.active { background: var(--surface-strong); color: var(--on-surface-strong); }
.btn-ghost {
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 8px 14px;
  font-size: 13px;
  cursor: pointer;
  color: var(--ink-soft);
}

.theme-picker { display: flex; gap: 5px; align-items: center; flex-wrap: wrap; max-width: 160px; justify-content: flex-end; }
.theme-dot {
  width: 19px; height: 19px;
  border-radius: 50%;
  border: 2px solid var(--line);
  cursor: pointer;
  padding: 0;
}
.theme-dot.active { border-color: var(--ink); box-shadow: 0 0 0 2px var(--paper), 0 0 0 3px var(--ink); }
.theme-dot-blue { background: linear-gradient(135deg, #2F6FED, #1D4FC4); }
.theme-dot-light-blue { background: linear-gradient(135deg, #6FD3FF, #039BE5); }
.theme-dot-navy { background: linear-gradient(135deg, #5C74FF, #2941D6); }
.theme-dot-dark { background: linear-gradient(135deg, #4FC3F7, #0B1626); }
.theme-dot-green { background: linear-gradient(135deg, #4ADE80, #16A34A); }
.theme-dot-pink { background: linear-gradient(135deg, #F472B6, #DB2777); }
.theme-dot-yellow { background: linear-gradient(135deg, #FDE047, #B87700); }
.theme-dot-red { background: linear-gradient(135deg, #F87171, #DC2626); }
.theme-dot-violet { background: linear-gradient(135deg, #A78BFA, #6D28D9); }

.tab-panel { display: none; flex: 1; overflow: auto; }
.tab-panel.active { display: flex; }
.panel-inner { max-width: 760px; margin: 0 auto; padding: 40px 24px; width: 100%; }
.plan-header-row { display: flex; align-items: center; gap: 16px; margin-bottom: 4px; }
.plan-mascot {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--line);
  background: var(--paper);
  flex-shrink: 0;
}
.plan-header-row h2 { margin-bottom: 4px; }
.plan-header-row p { margin: 0; }
.center-col { display: flex; flex-direction: column; align-items: center; text-align: center; }

/* ---------- Home / pickers ---------- */
.vocab-card {
  max-width: 420px;
  margin: 40px auto 0;
  background: var(--paper-raised);
  border: 1.5px solid var(--line);
  border-radius: 20px;
  padding: 48px 32px;
  text-align: center;
  cursor: pointer;
  min-height: 180px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
}
.vocab-card-word { font-family: var(--font-display); font-size: 28px; font-weight: 700; color: var(--ink); }
.vocab-card-translation { font-size: 18px; color: var(--accent-deep); font-weight: 600; }
.vocab-card-hint { font-size: 12px; color: var(--ink-soft); }
.vocab-review-actions {
  max-width: 420px;
  margin: 24px auto 0;
  display: flex;
  gap: 12px;
}
.vocab-btn-forgot, .vocab-btn-remembered {
  flex: 1;
  border: none;
  border-radius: 12px;
  padding: 14px;
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
}
.vocab-btn-forgot { background: var(--correction-bg); color: var(--correction); }
.vocab-btn-remembered { background: var(--praise-bg); color: var(--praise); }

.theme-picker-card { max-width: 400px; }
.theme-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-top: 16px;
}
.theme-choice {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  background: var(--paper);
  border: 1.5px solid var(--line);
  border-radius: 12px;
  padding: 14px 8px;
  font-size: 12px;
  font-weight: 600;
  color: var(--ink);
  cursor: pointer;
}
.theme-choice:hover { border-color: var(--accent-deep); }
.theme-choice.active { border-color: var(--ink); background: var(--paper-raised); box-shadow: 0 0 0 2px var(--accent) inset; }
.theme-swatch { width: 36px; height: 36px; border-radius: 50%; }

.streak-badge {
  display: flex;
  align-items: center;
  gap: 5px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 6px 12px;
  font-size: 13px;
  font-weight: 700;
  color: var(--ink);
}
#streak-flame { font-size: 15px; filter: grayscale(1); opacity: 0.5; }
.streak-badge.active #streak-flame { filter: none; opacity: 1; }

.home-streak-card {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 14px;
  background: var(--paper-raised);
  border: 1.5px solid var(--line);
  border-radius: 14px;
  padding: 14px 20px;
  margin-bottom: 16px;
  text-align: left;
}
.home-streak-mascot { width: 44px; height: 44px; border-radius: 50%; object-fit: cover; flex-shrink: 0; background: var(--paper); border: 1.5px solid var(--line); opacity: 0.85; }
.home-streak-card.active .home-streak-mascot { opacity: 1; border-color: var(--accent); }
.home-streak-text { display: flex; flex-direction: column; gap: 2px; }
.home-streak-text strong { font-size: 15px; color: var(--ink); }
.home-streak-text span { font-size: 12.5px; }

.home-subscribe-banner {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  background: color-mix(in srgb, var(--accent) 12%, var(--paper-raised));
  border: 1.5px solid var(--accent);
  border-radius: 14px;
  padding: 16px 20px;
  margin-bottom: 24px;
  text-align: left;
}
.home-subscribe-text { display: flex; flex-direction: column; gap: 2px; }
.home-subscribe-text strong { font-size: 14.5px; color: var(--ink); }
.home-subscribe-text span { font-size: 12.5px; }
#home-subscribe-btn { white-space: nowrap; flex-shrink: 0; }

.hero-icon {
  width: 104px; height: 104px;
  border-radius: 24px;
  background: var(--paper-raised);
  border: 1.5px solid var(--line);
  display: flex; align-items: center; justify-content: center;
  overflow: hidden;
  margin-bottom: 16px;
}
.hero-icon img { width: 100%; height: 100%; object-fit: cover; }
.picker-group { width: 100%; margin-top: 28px; text-align: left; }
.picker-label { font-size: 13px; font-weight: 600; color: var(--ink-soft); display: block; margin-bottom: 10px; }
.pill-row { display: flex; gap: 10px; flex-wrap: wrap; }
.pill {
  border: 1.5px solid var(--line);
  background: var(--paper-raised);
  border-radius: 10px;
  padding: 10px 16px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
}
.pill.selected { border-color: var(--surface-strong); background: var(--surface-strong); color: var(--on-surface-strong); }
.pill-flag { width: 20px; height: 15px; object-fit: cover; border-radius: 2px; flex-shrink: 0; }
.pill small { display: block; font-size: 10px; font-weight: 400; opacity: 0.8; margin-top: 1px; }
#picker-level .pill, #plan-picker-level .pill, #progress-picker-level .pill { flex-direction: column; gap: 2px; min-width: 74px; text-align: center; }

.topic-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
.topic-card {
  border: 1.5px solid var(--line);
  background: var(--paper-raised);
  border-radius: 12px;
  padding: 16px 10px;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  display: flex; flex-direction: column; align-items: center; gap: 8px;
}
.topic-card span { font-size: 12px; }
.topic-card.selected { border-color: var(--accent-deep); background: color-mix(in srgb, var(--accent) 18%, var(--paper-raised)); }

#start-conversation-btn { margin-top: 32px; max-width: 320px; }

/* ---------- Chat ---------- */
.chat-layout { display: flex; width: 100%; height: calc(100vh - 61px); }
.chat-sidebar {
  width: 240px;
  border-right: 1px solid var(--line);
  background: var(--paper-raised);
  padding: 16px;
  display: flex; flex-direction: column; gap: 12px;
  overflow-y: auto;
}
.btn-secondary {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 10px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
}
.convo-list { display: flex; flex-direction: column; gap: 4px; }
.convo-item {
  padding: 9px 10px;
  border-radius: 8px;
  font-size: 13px;
  color: var(--ink-soft);
  cursor: pointer;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.convo-item:hover { background: var(--paper); }
.convo-item.active { background: var(--paper); color: var(--ink); font-weight: 600; }

.chat-main { flex: 1; display: flex; flex-direction: column; }
.messages { flex: 1; overflow-y: auto; padding: 24px; display: flex; flex-direction: column; gap: 16px; }

.msg-row { display: flex; flex-direction: column; max-width: 70%; }
.msg-row.student { align-self: flex-end; align-items: flex-end; }
.msg-row.teacher { align-self: flex-start; align-items: flex-start; }
.msg-sender { font-size: 11px; color: var(--ink-soft); margin-bottom: 4px; font-weight: 600; }
.msg-teacher-content { display: flex; align-items: flex-end; gap: 8px; }
.msg-avatar {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
  background: var(--paper);
  border: 1.5px solid var(--line);
}
.msg-bubble { padding: 12px 16px; border-radius: 14px; font-size: 14px; line-height: 1.5; }
.msg-row.student .msg-bubble { background: var(--surface-strong); color: var(--on-surface-strong); border-bottom-right-radius: 4px; }
.msg-row.teacher .msg-bubble { background: var(--paper-raised); border: 1px solid var(--line); border-bottom-left-radius: 4px; }
.msg-audio-btn {
  margin-top: 6px;
  background: none;
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 4px 10px;
  font-size: 11px;
  cursor: pointer;
  color: var(--ink-soft);
}

.correction-card {
  margin-top: 8px;
  max-width: 100%;
  background: var(--correction-bg);
  border-left: 3px solid var(--correction);
  border-radius: 8px;
  padding: 12px 14px;
  font-size: 13px;
  line-height: 1.5;
}
.correction-card .correction-title { font-weight: 700; color: var(--correction); margin-bottom: 4px; display: flex; align-items: center; gap: 6px; }
.correction-card .corrected-version {
  margin-top: 8px;
  background: var(--paper-raised);
  border-radius: 6px;
  padding: 8px 10px;
  font-style: italic;
}
.praise-card {
  margin-top: 8px;
  background: var(--praise-bg);
  border-left: 3px solid var(--praise);
  border-radius: 8px;
  padding: 8px 14px;
  font-size: 13px;
  color: var(--praise);
  font-weight: 600;
}

.chat-input-row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 16px 24px;
  border-top: 1px solid var(--line);
  background: var(--paper-raised);
}
.chat-input-row input {
  flex: 1;
  border: 1px solid var(--line);
  border-radius: 24px;
  padding: 12px 18px;
  font-size: 14px;
  font-family: var(--font-body);
  background: var(--paper-raised);
  color: var(--ink);
}
.mic-btn, .send-btn {
  border: none;
  background: var(--surface-strong);
  color: var(--on-surface-strong);
  width: 42px; height: 42px;
  border-radius: 50%;
  cursor: pointer;
  font-size: 16px;
  flex-shrink: 0;
}
.mic-btn { background: var(--paper); color: var(--ink); border: 1px solid var(--line); transition: transform 0.15s ease; }
.mic-btn.recording {
  background: var(--correction);
  color: white;
  border-color: var(--correction);
  transform: scale(1.15);
  animation: mic-pulse 1.2s ease-in-out infinite;
}

@keyframes mic-pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(193, 80, 46, 0.45); }
  50% { box-shadow: 0 0 0 10px rgba(193, 80, 46, 0); }
}

.recording-indicator {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 24px;
  background: var(--correction-bg);
  border-top: 1px solid var(--line);
  font-size: 13.5px;
  font-weight: 600;
  color: var(--correction);
}
.recording-dot {
  width: 10px; height: 10px;
  border-radius: 50%;
  background: var(--correction);
  animation: mic-pulse 1s ease-in-out infinite;
  flex-shrink: 0;
}
#recording-timer { font-variant-numeric: tabular-nums; color: var(--ink-soft); font-weight: 500; }
.recording-hint { margin-left: auto; color: var(--ink-soft); font-weight: 500; font-style: italic; }

.empty-chat-hint { margin: auto; color: var(--ink-soft); font-size: 14px; text-align: center; }

.lesson-banner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 20px;
  background: var(--correction-bg);
  border-bottom: 1px solid var(--line);
  font-size: 13px;
  font-weight: 600;
  color: var(--ink);
}
.btn-finish-lesson {
  background: var(--praise);
  color: white;
  border: none;
  border-radius: 8px;
  padding: 7px 14px;
  font-size: 12.5px;
  font-weight: 700;
  cursor: pointer;
  flex-shrink: 0;
}

.btn-exercise {
  background: var(--paper);
  color: var(--ink);
  border: 1px solid var(--line) !important;
}

/* ---------- Exercises ---------- */
.exercise-mascot-row { display: flex; align-items: center; gap: 12px; margin-bottom: 18px; }
.exercise-mascot {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--line);
  background: var(--paper);
  flex-shrink: 0;
}
.exercise-mascot-text { font-family: var(--font-display); font-weight: 700; color: var(--ink); font-size: 15px; }
.exercise-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 8px; }
.exercise-back { background: none; border: none; color: var(--ink-soft); font-size: 13px; cursor: pointer; padding: 0; }
.exercise-progress-track { height: 8px; border-radius: 4px; background: var(--line); overflow: hidden; margin-bottom: 28px; }
.exercise-progress-fill { height: 100%; background: var(--accent-deep); transition: width 0.3s ease; }

.exercise-question {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 24px;
}
.exercise-options { display: flex; flex-direction: column; gap: 10px; }
.exercise-option {
  text-align: left;
  border: 1.5px solid var(--line);
  background: var(--paper-raised);
  border-radius: 12px;
  padding: 14px 18px;
  font-size: 15px;
  cursor: pointer;
  color: var(--ink);
}
.exercise-option:hover:not(:disabled) { border-color: var(--accent-deep); }
.exercise-option.correct { border-color: var(--praise); background: var(--praise-bg); }
.exercise-option.incorrect { border-color: var(--correction); background: var(--correction-bg); }
.exercise-option:disabled { cursor: default; }

.exercise-explanation {
  margin-top: 20px;
  background: var(--paper);
  border-radius: 10px;
  padding: 14px 16px;
  font-size: 13.5px;
  color: var(--ink-soft);
}
.exercise-next-btn { margin-top: 24px; }

.exercise-result { text-align: center; padding: 20px 0; }
.exercise-result .score { font-family: var(--font-display); font-size: 48px; font-weight: 700; color: var(--accent-deep); margin: 12px 0; }
.exercise-result-actions { display: flex; gap: 10px; justify-content: center; margin-top: 24px; flex-wrap: wrap; }

/* ---------- Study plan ---------- */
.plan-progress-bar { display: flex; align-items: center; gap: 12px; margin: 20px 0 24px; }
.bar-track { flex: 1; height: 8px; border-radius: 4px; background: var(--line); overflow: hidden; }
.bar-fill { height: 100%; background: linear-gradient(90deg, var(--accent), var(--accent-deep)); width: 0%; transition: width 0.3s ease; }
#plan-progress-label { font-size: 13px; color: var(--ink-soft); white-space: nowrap; }

.lesson-list { display: flex; flex-direction: column; gap: 10px; }
.lesson-card {
  background: var(--paper-raised);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 16px 18px;
  display: flex;
  align-items: center;
  gap: 14px;
}
.lesson-card.completed { opacity: 0.6; }
.lesson-card.locked { opacity: 0.55; }
.lesson-actions button:disabled { opacity: 0.5; cursor: not-allowed; }
.lesson-num {
  width: 28px; height: 28px;
  border-radius: 50%;
  background: var(--paper);
  border: 1.5px solid var(--line);
  display: flex; align-items: center; justify-content: center;
  font-size: 12px; font-weight: 700;
  flex-shrink: 0;
}
.lesson-card.completed .lesson-num { background: var(--praise); color: white; border-color: var(--praise); }
.lesson-body { flex: 1; }
.lesson-title-row { display: flex; align-items: center; gap: 8px; }
.lesson-title { font-weight: 600; font-size: 14px; }
.skill-tag { font-size: 10px; padding: 2px 8px; border-radius: 20px; background: var(--paper); color: var(--ink-soft); font-weight: 600; }
.lesson-desc { font-size: 12.5px; color: var(--ink-soft); margin-top: 3px; }
.lesson-requirements { display: flex; gap: 8px; margin-top: 8px; }
.req-badge {
  font-size: 11px;
  font-weight: 600;
  padding: 3px 9px;
  border-radius: 20px;
  background: var(--paper);
  color: var(--ink-soft);
  border: 1px solid var(--line);
}
.req-badge.done { background: var(--praise-bg); color: var(--praise); border-color: transparent; }
.lesson-actions { display: flex; gap: 8px; flex-shrink: 0; }
.lesson-actions button {
  border: none;
  border-radius: 8px;
  padding: 7px 12px;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
}
.btn-practice { background: var(--surface-strong); color: var(--on-surface-strong); }
.btn-done { background: var(--paper); color: var(--ink-soft); border: 1px solid var(--line) !important; }

/* ---------- Progress ---------- */
.progress-hero { display: flex; align-items: center; gap: 28px; margin: 24px 0 32px; }
.progress-ring-wrap { position: relative; width: 120px; height: 120px; flex-shrink: 0; }
.progress-ring { width: 120px; height: 120px; transform: rotate(-90deg); }
.ring-bg { fill: none; stroke: var(--line); stroke-width: 10; }
.ring-fill { fill: none; stroke: var(--accent-deep); stroke-width: 10; stroke-linecap: round; stroke-dasharray: 327; stroke-dashoffset: 327; transition: stroke-dashoffset 0.4s ease; }
.ring-label { position: absolute; inset: 0; display: flex; align-items: center; justify-content: center; font-family: var(--font-display); font-size: 22px; font-weight: 700; }
.stat-line { font-size: 15px; }

.stat-cards { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin-bottom: 32px; }
.stat-card { background: var(--paper-raised); border: 1px solid var(--line); border-radius: 12px; padding: 16px; text-align: center; }
.stat-num { display: block; font-family: var(--font-display); font-size: 24px; font-weight: 700; }
.stat-label { font-size: 11.5px; color: var(--ink-soft); }

.skill-bars { display: flex; flex-direction: column; gap: 10px; margin-top: 14px; }
.skill-bar-row { display: flex; align-items: center; gap: 12px; }
.skill-bar-row .skill-name { width: 100px; font-size: 12.5px; color: var(--ink-soft); flex-shrink: 0; }
.skill-bar-track { flex: 1; height: 10px; border-radius: 5px; background: var(--paper); overflow: hidden; }
.skill-bar-fill { height: 100%; background: var(--ink); border-radius: 5px; }

.bottom-tabs { display: none; }

/* ---------- Admin ---------- */
.admin-users-list { display: flex; flex-direction: column; gap: 12px; margin-top: 20px; }
.admin-user-card {
  background: var(--paper-raised);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 16px 18px;
}
.admin-user-top { display: flex; justify-content: space-between; align-items: baseline; flex-wrap: wrap; gap: 6px; margin-bottom: 10px; }
.admin-user-name { font-weight: 700; font-size: 14px; }
.admin-user-email { font-size: 12.5px; color: var(--ink-soft); }
.admin-user-fields { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 10px; }
.admin-field { display: flex; flex-direction: column; gap: 4px; }
.admin-field label { font-size: 11px; font-weight: 600; color: var(--ink-soft); }
.admin-field select, .admin-field input {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 7px 9px;
  font-size: 13px;
  background: var(--paper-raised);
  color: var(--ink);
  font-family: var(--font-body);
}
.admin-user-actions { margin-top: 12px; display: flex; justify-content: flex-end; gap: 8px; }
.admin-delete-btn {
  background: var(--correction-bg);
  color: var(--correction);
  border: none;
  border-radius: 8px;
  padding: 8px 16px;
  font-size: 12.5px;
  font-weight: 700;
  cursor: pointer;
  margin-right: auto;
}
.admin-save-btn {
  background: var(--surface-strong);
  color: var(--on-surface-strong);
  border: none;
  border-radius: 8px;
  padding: 8px 16px;
  font-size: 12.5px;
  font-weight: 700;
  cursor: pointer;
}
.admin-save-btn.saved { background: var(--praise); }
.status-badge { font-size: 10.5px; padding: 2px 9px; border-radius: 20px; font-weight: 700; }
.status-badge.active { background: var(--praise-bg); color: var(--praise); }
.status-badge.trial { background: color-mix(in srgb, var(--accent) 18%, var(--paper)); color: var(--accent-deep); }
.status-badge.suspended, .status-badge.expired { background: var(--correction-bg); color: var(--correction); }
.status-badge.cancelled { background: var(--paper); color: var(--ink-soft); border: 1px solid var(--line); }

.admin-field-checkbox { justify-content: center; }
.admin-field-checkbox label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  font-weight: 600;
  color: var(--ink);
  cursor: pointer;
}
.admin-field-checkbox input[type="checkbox"] { width: 15px; height: 15px; cursor: pointer; }

/* ---------- Overview cards (admin + teacher) ---------- */
.overview-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 10px;
  margin: 20px 0;
}
.overview-card {
  background: var(--paper-raised);
  border: 1.5px solid var(--line);
  border-radius: 12px;
  padding: 14px 12px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.overview-card.highlight { border-color: var(--accent); background: color-mix(in srgb, var(--accent) 8%, var(--paper-raised)); }
.overview-num { font-family: var(--font-display); font-size: 22px; font-weight: 700; color: var(--ink); }
.overview-label { font-size: 11px; color: var(--ink-soft); font-weight: 600; }

/* ---------- Admin toolbar (search + filters) ---------- */
.admin-toolbar { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 4px; }
.admin-search-input {
  flex: 2;
  min-width: 180px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 9px 12px;
  font-size: 13px;
  background: var(--paper-raised);
  color: var(--ink);
  font-family: var(--font-body);
}
.admin-filter-select {
  flex: 1;
  min-width: 130px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 9px 10px;
  font-size: 13px;
  background: var(--paper-raised);
  color: var(--ink);
  font-family: var(--font-body);
}

/* ---------- Teacher dashboard ---------- */
.teacher-student-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(110px, 1fr));
  gap: 10px;
  margin-top: 4px;
}
.teacher-stat { display: flex; flex-direction: column; gap: 2px; }
.teacher-stat-num { font-size: 14px; font-weight: 700; color: var(--ink); }
.teacher-stat-label { font-size: 11px; color: var(--ink-soft); }

/* ---------- Access blocked overlay ---------- */
.access-blocked-overlay {
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.55);
  display: flex; align-items: center; justify-content: center;
  z-index: 200;
  padding: 20px;
}
.access-blocked-card {
  background: var(--paper-raised);
  border-radius: 16px;
  padding: 32px 28px;
  max-width: 360px;
  text-align: center;
}
.access-blocked-card h3 { margin: 10px 0 8px; }
.access-blocked-card .btn-primary { margin-top: 18px; }

@media (max-width: 720px) {
  .tabs { display: none; }
  .chat-sidebar { display: none; }
  .topbar-username { max-width: 76px; font-size: 11.5px; }
  .plan-header-row { gap: 12px; }
  .plan-mascot { width: 50px; height: 50px; }
  .stat-cards { grid-template-columns: repeat(2, 1fr); }
  .topic-grid { grid-template-columns: repeat(2, 1fr); }

  .bottom-tabs {
    display: flex;
    position: fixed;
    bottom: 0; left: 0; right: 0;
    background: var(--paper-raised);
    border-top: 1px solid var(--line);
    padding: 6px 4px calc(6px + env(safe-area-inset-bottom, 0px));
    z-index: 50;
  }
  .bottom-tabs .tab-btn {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
    font-size: 9.5px;
    padding: 6px 2px;
    border-radius: 10px;
    background: transparent;
    color: var(--ink-soft);
  }
  .bottom-tabs .tab-btn.active { background: transparent; color: var(--accent-deep); font-weight: 700; }
  .bottom-tabs .tab-icon { font-size: 19px; }

  .tab-panel.active { padding-bottom: 64px; }
  .chat-layout { height: calc(100vh - 61px - 60px); }
  .theme-picker { flex-wrap: wrap; max-width: 90px; justify-content: flex-end; }

  .lesson-card {
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
  }
  .lesson-card .lesson-num { align-self: flex-start; }
  .lesson-actions {
    flex-wrap: wrap;
    width: 100%;
  }
  .lesson-actions button {
    flex: 1 1 auto;
    min-width: 0;
    text-align: center;
  }
}