/* =============================================
   StudySphere — Style System
   Font: Sora (UI) + JetBrains Mono (code/timer)
   Aesthetic: Clean academic, calm indigo palette
   ============================================= */

:root {
  --bg: #f0f4ff;
  --bg2: #ffffff;
  --bg3: #e8eeff;
  --surface: #ffffff;
  --border: #d4daf5;
  --text: #1a1f3a;
  --text2: #5a6080;
  --text3: #9099c0;
  --accent: #2563eb;
  --accent2: #7c3aed;
  --accent3: #0ea5e9;
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --shadow: 0 2px 16px rgba(37,99,235,0.08);
  --shadow-lg: 0 8px 40px rgba(37,99,235,0.14);
  --radius: 14px;
  --radius-sm: 8px;
  --sidebar-w: 256px;
  --font: 'Sora', sans-serif;
  --mono: 'JetBrains Mono', monospace;
  --transition: 0.22s cubic-bezier(0.4,0,0.2,1);
}

[data-theme="dark"] {
  --bg: #0f1120;
  --bg2: #161929;
  --bg3: #1e2240;
  --surface: #1e2240;
  --border: #2a3060;
  --text: #e8edff;
  --text2: #9099c0;
  --text3: #5a6080;
  --shadow: 0 2px 16px rgba(0,0,0,0.4);
  --shadow-lg: 0 8px 40px rgba(0,0,0,0.5);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  display: flex;
  min-height: 100vh;
  transition: background var(--transition), color var(--transition);
  overflow-x: hidden;
}

/* ---- SCROLLBAR ---- */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 99px; }

/* ===================== SIDEBAR ===================== */
.sidebar {
  width: var(--sidebar-w);
  background: var(--bg2);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0; left: 0; bottom: 0;
  z-index: 200;
  transform: translateX(0);
  transition: transform var(--transition), box-shadow var(--transition);
  overflow-y: auto;
}

.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 18px 16px;
  border-bottom: 1px solid var(--border);
}
.logo { display: flex; align-items: center; gap: 10px; }
.logo-icon { font-size: 22px; }
.logo-text { font-size: 18px; font-weight: 700; color: var(--accent); letter-spacing: -0.4px; }
.sidebar-close { display: none; background: none; border: none; color: var(--text2); cursor: pointer; font-size: 18px; }

.user-card {
  display: flex; align-items: center; gap: 12px;
  padding: 14px 18px;
  background: var(--bg3);
  margin: 12px 12px 4px;
  border-radius: var(--radius);
  cursor: pointer;
}
.user-info { min-width: 0; }
.user-name { font-weight: 600; font-size: 14px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.user-level { font-size: 11px; color: var(--text3); margin-top: 2px; font-family: var(--mono); }

/* AVATAR */
.avatar {
  width: 38px; height: 38px; border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 15px; color: #fff;
  flex-shrink: 0; user-select: none;
}
.avatar.sm { width: 32px; height: 32px; font-size: 13px; }
.avatar.lg { width: 80px; height: 80px; font-size: 32px; }

/* NAV */
.nav-menu { padding: 8px 10px; flex: 1; }
.nav-item {
  display: flex; align-items: center; gap: 11px;
  padding: 10px 12px; border-radius: var(--radius-sm);
  color: var(--text2); text-decoration: none; font-size: 14px; font-weight: 500;
  transition: all var(--transition);
}
.nav-item:hover { background: var(--bg3); color: var(--text); }
.nav-item.active { background: #2563eb18; color: var(--accent); font-weight: 600; }
.nav-item i { width: 18px; text-align: center; }

/* SUBJECTS */
.sidebar-subjects { padding: 4px 18px 12px; }
.section-label { font-size: 10px; font-weight: 700; letter-spacing: 1px; color: var(--text3); text-transform: uppercase; margin-bottom: 8px; }
.subject-tags { display: flex; flex-wrap: wrap; gap: 6px; }
.subject-tag {
  font-size: 11px; padding: 4px 10px; border-radius: 99px;
  background: var(--bg3); color: var(--text2); cursor: pointer;
  border: 1px solid var(--border); transition: all var(--transition);
  font-weight: 500;
}
.subject-tag:hover, .subject-tag.active { background: var(--accent); color: #fff; border-color: var(--accent); }

/* SIDEBAR FOOTER */
.sidebar-footer { padding: 12px 18px 20px; border-top: 1px solid var(--border); }
.theme-toggle {
  width: 100%; padding: 9px; border-radius: var(--radius-sm);
  background: var(--bg3); border: 1px solid var(--border);
  color: var(--text2); cursor: pointer; font-family: var(--font);
  font-size: 13px; display: flex; align-items: center; justify-content: center; gap: 8px;
  transition: all var(--transition);
}
.theme-toggle:hover { background: var(--accent); color: #fff; border-color: var(--accent); }
.streak-badge {
  text-align: center; margin-top: 10px; font-size: 12px;
  color: var(--warning); font-weight: 600; font-family: var(--mono);
}

/* ===================== OVERLAY ===================== */
.overlay {
  display: none; position: fixed; inset: 0;
  background: rgba(0,0,0,0.4); z-index: 190; backdrop-filter: blur(2px);
}
.overlay.visible { display: block; }

/* ===================== MAIN ===================== */
.main-content {
  margin-left: var(--sidebar-w);
  flex: 1; min-height: 100vh;
  display: flex; flex-direction: column;
}

/* TOPBAR */
.topbar {
  position: sticky; top: 0; z-index: 100;
  background: var(--bg2); border-bottom: 1px solid var(--border);
  padding: 10px 20px;
  display: flex; align-items: center; gap: 14px;
  box-shadow: var(--shadow);
}
.menu-btn {
  display: none; background: none; border: none; color: var(--text2);
  font-size: 18px; cursor: pointer; padding: 4px 8px;
}
.search-bar {
  flex: 1; display: flex; align-items: center; gap: 10px;
  background: var(--bg3); border: 1px solid var(--border);
  border-radius: 99px; padding: 8px 16px;
  max-width: 500px; transition: border var(--transition);
}
.search-bar:focus-within { border-color: var(--accent); }
.search-bar i { color: var(--text3); }
.search-bar input { flex: 1; background: none; border: none; outline: none; color: var(--text); font-family: var(--font); font-size: 14px; }
.topbar-actions { display: flex; align-items: center; gap: 10px; margin-left: auto; }
.icon-btn {
  position: relative; background: none; border: none; color: var(--text2);
  font-size: 16px; cursor: pointer; padding: 6px; border-radius: var(--radius-sm);
  transition: all var(--transition);
}
.icon-btn:hover { background: var(--bg3); color: var(--accent); }
.icon-btn .badge {
  position: absolute; top: 0; right: 0;
  background: var(--danger); color: #fff; font-size: 9px;
  width: 16px; height: 16px; border-radius: 50%; display: flex; align-items: center; justify-content: center;
  font-family: var(--mono); font-weight: 700;
}

/* ===================== PAGE WRAPPER ===================== */
.page-wrapper { flex: 1; padding: 24px 28px; max-width: 900px; margin: 0 auto; width: 100%; }
.page { display: none; animation: fadeSlide 0.3s ease; }
.page.active { display: block; }

@keyframes fadeSlide {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.page-header {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 20px;
}
.page-header h1 { font-size: 22px; font-weight: 700; }

/* ===================== BUTTONS ===================== */
.btn {
  display: inline-flex; align-items: center; gap: 7px;
  padding: 9px 18px; border-radius: var(--radius-sm);
  font-family: var(--font); font-size: 13px; font-weight: 600;
  cursor: pointer; transition: all var(--transition); border: none;
}
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: #1d4ed8; transform: translateY(-1px); box-shadow: 0 4px 12px rgba(37,99,235,0.3); }
.btn-outline { background: transparent; border: 1px solid var(--border); color: var(--text2); }
.btn-outline:hover { border-color: var(--accent); color: var(--accent); }
.btn-danger { background: var(--danger); color: #fff; }

/* ===================== QUOTE BANNER ===================== */
.quote-banner {
  background: linear-gradient(135deg, #2563eb14, #7c3aed10);
  border: 1px solid var(--border); border-left: 4px solid var(--accent);
  padding: 14px 20px; border-radius: var(--radius); margin-bottom: 20px;
  font-size: 14px; color: var(--text2); font-style: italic; line-height: 1.6;
}

/* ===================== FILTER BAR ===================== */
.filter-bar { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 20px; }
.filter-btn {
  padding: 6px 14px; border-radius: 99px;
  background: var(--bg3); border: 1px solid var(--border);
  color: var(--text2); cursor: pointer; font-family: var(--font); font-size: 13px; font-weight: 500;
  transition: all var(--transition);
}
.filter-btn:hover, .filter-btn.active { background: var(--accent); color: #fff; border-color: var(--accent); }

/* ===================== POST CARD ===================== */
.post-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 18px 20px;
  margin-bottom: 14px; transition: all var(--transition);
}
.post-card:hover { box-shadow: var(--shadow); border-color: var(--accent); }

.post-header { display: flex; align-items: center; gap: 12px; margin-bottom: 12px; }
.post-meta { flex: 1; min-width: 0; }
.post-author { font-weight: 600; font-size: 14px; }
.post-date { font-size: 12px; color: var(--text3); font-family: var(--mono); }
.post-type {
  font-size: 11px; padding: 3px 10px; border-radius: 99px; font-weight: 600;
}
.post-type.note { background: #10b98120; color: #10b981; }
.post-type.question { background: #f59e0b20; color: #f59e0b; }
.post-type.tip { background: #7c3aed20; color: #7c3aed; }
.post-type.advice { background: #0ea5e920; color: #0ea5e9; }

.post-title { font-size: 16px; font-weight: 600; margin-bottom: 6px; }
.post-body { font-size: 14px; color: var(--text2); line-height: 1.7; margin-bottom: 12px; }
.post-subject { font-size: 11px; color: var(--accent); font-weight: 600; margin-bottom: 10px; }
.post-actions { display: flex; gap: 16px; align-items: center; }
.post-action {
  background: none; border: none; color: var(--text3); cursor: pointer;
  font-size: 13px; display: flex; align-items: center; gap: 5px;
  font-family: var(--font); transition: color var(--transition);
}
.post-action:hover { color: var(--accent); }
.post-action.liked { color: var(--danger); }

/* COMMENTS */
.post-comments { margin-top: 14px; border-top: 1px solid var(--border); padding-top: 12px; }
.comment { display: flex; gap: 10px; margin-bottom: 10px; }
.comment-content { flex: 1; }
.comment-author { font-size: 12px; font-weight: 600; }
.comment-text { font-size: 13px; color: var(--text2); margin-top: 2px; }
.comment-input-row { display: flex; gap: 8px; margin-top: 10px; }
.comment-input-row input {
  flex: 1; padding: 8px 12px; border-radius: var(--radius-sm);
  border: 1px solid var(--border); background: var(--bg3);
  color: var(--text); font-family: var(--font); font-size: 13px;
  outline: none;
}
.comment-input-row input:focus { border-color: var(--accent); }

/* ===================== NOTES GRID ===================== */
.notes-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 16px; }
.note-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 18px; cursor: pointer;
  transition: all var(--transition); position: relative; overflow: hidden;
}
.note-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
}
.note-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-2px); }
.note-subject { font-size: 11px; font-weight: 700; color: var(--accent); text-transform: uppercase; letter-spacing: 0.5px; margin-bottom: 8px; }
.note-title { font-size: 15px; font-weight: 600; margin-bottom: 6px; }
.note-preview { font-size: 13px; color: var(--text2); line-height: 1.5; margin-bottom: 12px; display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }
.note-footer { display: flex; justify-content: space-between; align-items: center; font-size: 12px; color: var(--text3); }
.featured-badge { font-size: 10px; background: var(--warning); color: #fff; padding: 2px 8px; border-radius: 99px; font-weight: 700; }

/* ===================== GROUPS GRID ===================== */
.groups-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 16px; }
.group-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 18px; cursor: pointer;
  transition: all var(--transition);
}
.group-card:hover { box-shadow: var(--shadow); border-color: var(--accent); }
.group-icon { font-size: 28px; margin-bottom: 10px; }
.group-name { font-size: 16px; font-weight: 600; margin-bottom: 4px; }
.group-subject { font-size: 12px; color: var(--accent); font-weight: 600; margin-bottom: 8px; }
.group-members { font-size: 12px; color: var(--text3); }
.group-join {
  margin-top: 12px; width: 100%; padding: 8px;
  background: var(--accent); color: #fff; border: none; border-radius: var(--radius-sm);
  font-family: var(--font); font-size: 13px; font-weight: 600; cursor: pointer;
  transition: all var(--transition);
}
.group-join:hover { background: #1d4ed8; }
.group-join.joined { background: var(--success); }

/* ===================== CHAT ===================== */
.chat-panel { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; }
.chat-header { display: flex; align-items: center; gap: 12px; padding: 14px 18px; border-bottom: 1px solid var(--border); font-weight: 600; }
.back-btn { background: none; border: none; color: var(--text2); cursor: pointer; font-size: 16px; }
.chat-messages { height: 350px; overflow-y: auto; padding: 16px; display: flex; flex-direction: column; gap: 10px; }
.chat-msg { display: flex; gap: 8px; max-width: 80%; }
.chat-msg.own { flex-direction: row-reverse; align-self: flex-end; }
.chat-bubble {
  padding: 9px 14px; border-radius: 14px; font-size: 14px; line-height: 1.5;
  background: var(--bg3); border-bottom-left-radius: 4px;
}
.chat-msg.own .chat-bubble { background: var(--accent); color: #fff; border-bottom-left-radius: 14px; border-bottom-right-radius: 4px; }
.chat-input-row { display: flex; gap: 8px; padding: 12px; border-top: 1px solid var(--border); }
.chat-input-row input { flex: 1; padding: 9px 14px; border-radius: 99px; border: 1px solid var(--border); background: var(--bg3); color: var(--text); font-family: var(--font); font-size: 14px; outline: none; }
.chat-input-row input:focus { border-color: var(--accent); }

/* ===================== TOOLS ===================== */
.tools-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 20px; }
.tool-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 22px;
  transition: all var(--transition);
}
.tool-card:hover { box-shadow: var(--shadow); }
.tool-icon { font-size: 30px; margin-bottom: 10px; }
.tool-card h3 { font-size: 16px; font-weight: 700; margin-bottom: 14px; }

/* POMODORO */
.pomodoro-display {
  font-family: var(--mono); font-size: 52px; font-weight: 700;
  text-align: center; color: var(--accent);
  padding: 14px 0; letter-spacing: -2px;
}
.pomodoro-controls { display: flex; gap: 8px; margin-bottom: 12px; }
.pomodoro-controls .btn { flex: 1; justify-content: center; }
.pomodoro-mode { display: flex; gap: 6px; flex-wrap: wrap; }
.mode-btn {
  flex: 1; padding: 6px; border-radius: var(--radius-sm);
  background: var(--bg3); border: 1px solid var(--border);
  color: var(--text2); cursor: pointer; font-family: var(--font); font-size: 12px; font-weight: 500;
  transition: all var(--transition);
}
.mode-btn.active { background: var(--accent); color: #fff; border-color: var(--accent); }

/* FLASHCARD */
.flashcard {
  width: 100%; height: 130px; perspective: 1000px; cursor: pointer; margin-bottom: 12px;
}
.flashcard-inner {
  width: 100%; height: 100%; position: relative;
  transform-style: preserve-3d; transition: transform 0.5s;
}
.flashcard.flipped .flashcard-inner { transform: rotateY(180deg); }
.flashcard-front, .flashcard-back {
  position: absolute; inset: 0; backface-visibility: hidden;
  background: var(--bg3); border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  padding: 16px; text-align: center; font-size: 15px; font-weight: 500;
  border: 1px solid var(--border);
}
.flashcard-back { transform: rotateY(180deg); background: var(--accent); color: #fff; }
.flashcard-controls { display: flex; align-items: center; justify-content: space-between; margin-bottom: 10px; font-size: 13px; color: var(--text3); font-family: var(--mono); }

/* TASKS */
.task-input-row { display: flex; gap: 8px; margin-bottom: 12px; }
.task-input-row input { flex: 1; padding: 8px 12px; border-radius: var(--radius-sm); border: 1px solid var(--border); background: var(--bg3); color: var(--text); font-family: var(--font); font-size: 13px; outline: none; }
.task-input-row input:focus { border-color: var(--accent); }
.task-list { list-style: none; margin-bottom: 12px; max-height: 180px; overflow-y: auto; }
.task-item {
  display: flex; align-items: center; gap: 10px; padding: 8px;
  border-radius: var(--radius-sm); transition: background var(--transition);
}
.task-item:hover { background: var(--bg3); }
.task-item input[type="checkbox"] { accent-color: var(--accent); width: 16px; height: 16px; cursor: pointer; }
.task-item label { flex: 1; font-size: 13px; cursor: pointer; }
.task-item.done label { text-decoration: line-through; color: var(--text3); }
.task-del { background: none; border: none; color: var(--text3); cursor: pointer; font-size: 12px; padding: 2px 6px; border-radius: 4px; }
.task-del:hover { color: var(--danger); background: #ef444420; }
.progress-bar-wrap { height: 6px; background: var(--bg3); border-radius: 99px; overflow: hidden; }
.progress-bar { height: 100%; background: var(--success); border-radius: 99px; transition: width 0.4s ease; }
.progress-label { font-size: 11px; color: var(--text3); margin-top: 4px; text-align: right; font-family: var(--mono); }

/* GOALS */
.goals-list { margin-bottom: 12px; }
.goal-item { display: flex; align-items: center; gap: 10px; padding: 7px 0; border-bottom: 1px solid var(--border); font-size: 13px; }
.goal-item:last-child { border: none; }
.goal-done { color: var(--success); cursor: pointer; }

/* PLANNER */
.planner-list { margin-bottom: 12px; max-height: 160px; overflow-y: auto; }
.planner-item { display: flex; gap: 10px; padding: 7px 0; border-bottom: 1px solid var(--border); font-size: 13px; align-items: center; }
.planner-item:last-child { border: none; }
.planner-time { font-family: var(--mono); font-size: 12px; color: var(--accent); font-weight: 600; }
.planner-form { display: flex; gap: 6px; flex-wrap: wrap; }
.planner-form input, .planner-form select {
  flex: 1; min-width: 80px; padding: 7px 10px; border-radius: var(--radius-sm);
  border: 1px solid var(--border); background: var(--bg3); color: var(--text);
  font-family: var(--font); font-size: 12px; outline: none;
}

/* QUIZ */
#quizArea { margin-bottom: 12px; }
.quiz-question { font-size: 14px; font-weight: 600; margin-bottom: 12px; line-height: 1.5; }
.quiz-options { display: flex; flex-direction: column; gap: 7px; }
.quiz-opt {
  padding: 9px 14px; border-radius: var(--radius-sm);
  border: 1px solid var(--border); background: var(--bg3);
  cursor: pointer; font-size: 13px; text-align: left; font-family: var(--font);
  transition: all var(--transition);
}
.quiz-opt:hover { border-color: var(--accent); }
.quiz-opt.correct { background: #10b98120; border-color: var(--success); color: var(--success); }
.quiz-opt.wrong { background: #ef444420; border-color: var(--danger); color: var(--danger); }
.quiz-score { font-size: 18px; font-weight: 700; text-align: center; color: var(--accent); padding: 12px 0; font-family: var(--mono); }

/* ===================== QA ===================== */
.qa-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 18px 20px; margin-bottom: 14px;
  transition: all var(--transition);
}
.qa-card:hover { box-shadow: var(--shadow); }
.qa-status { font-size: 11px; padding: 3px 10px; border-radius: 99px; font-weight: 700; display: inline-block; margin-bottom: 8px; }
.qa-status.answered { background: #10b98120; color: #10b981; }
.qa-status.open { background: #f59e0b20; color: #f59e0b; }
.qa-title { font-size: 16px; font-weight: 600; margin-bottom: 6px; }
.qa-body { font-size: 14px; color: var(--text2); line-height: 1.6; }
.qa-answers { margin-top: 14px; border-top: 1px solid var(--border); padding-top: 12px; }
.answer-item { padding: 10px; background: var(--bg3); border-radius: var(--radius-sm); margin-bottom: 8px; font-size: 13px; line-height: 1.6; }
.answer-author { font-weight: 600; font-size: 12px; margin-bottom: 4px; color: var(--accent); }

/* ===================== LEADERBOARD ===================== */
.leaderboard-tabs { display: flex; gap: 8px; margin-bottom: 20px; }
.leaderboard-list { display: flex; flex-direction: column; gap: 10px; }
.lb-item {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 14px 18px;
  display: flex; align-items: center; gap: 14px;
  transition: all var(--transition);
}
.lb-item:hover { box-shadow: var(--shadow); }
.lb-rank { font-family: var(--mono); font-size: 18px; font-weight: 700; width: 32px; text-align: center; }
.lb-rank.gold { color: #f59e0b; }
.lb-rank.silver { color: #9ca3af; }
.lb-rank.bronze { color: #d97706; }
.lb-info { flex: 1; }
.lb-name { font-weight: 600; font-size: 15px; }
.lb-meta { font-size: 12px; color: var(--text3); font-family: var(--mono); }
.lb-score { font-family: var(--mono); font-weight: 700; font-size: 16px; color: var(--accent); }
.lb-badge { font-size: 18px; }

/* ===================== PROFILE ===================== */
.profile-hero { display: flex; gap: 20px; align-items: flex-start; margin-bottom: 20px; flex-wrap: wrap; }
.profile-info { flex: 1; min-width: 200px; }
.profile-info h2 { font-size: 24px; font-weight: 700; margin-bottom: 4px; }
.profile-meta { font-size: 13px; color: var(--text3); margin-bottom: 12px; }
.xp-bar-wrap { height: 8px; background: var(--bg3); border-radius: 99px; overflow: hidden; margin-bottom: 6px; }
.xp-bar { height: 100%; background: linear-gradient(90deg, var(--accent), var(--accent2)); border-radius: 99px; transition: width 0.5s ease; }
.xp-label { font-size: 12px; color: var(--text3); font-family: var(--mono); }
.badges-row { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 20px; }
.badge-chip {
  display: flex; align-items: center; gap: 6px;
  padding: 6px 12px; border-radius: 99px;
  background: var(--bg3); border: 1px solid var(--border); font-size: 12px; font-weight: 600;
}
.profile-stats { display: grid; grid-template-columns: repeat(auto-fill, minmax(130px, 1fr)); gap: 12px; margin-bottom: 24px; }
.stat-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px; text-align: center; }
.stat-value { font-size: 24px; font-weight: 700; color: var(--accent); font-family: var(--mono); }
.stat-label { font-size: 12px; color: var(--text3); margin-top: 2px; }
.profile-edit-form { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 22px; }
.profile-edit-form h3 { font-size: 16px; font-weight: 700; margin-bottom: 14px; }
.profile-edit-form input, .profile-edit-form select {
  width: 100%; padding: 10px 14px; border-radius: var(--radius-sm);
  border: 1px solid var(--border); background: var(--bg3); color: var(--text);
  font-family: var(--font); font-size: 14px; outline: none; margin-bottom: 10px;
}
.profile-edit-form input:focus, .profile-edit-form select:focus { border-color: var(--accent); }

/* ===================== MODAL ===================== */
.modal-overlay {
  display: none; position: fixed; inset: 0;
  background: rgba(0,0,0,0.5); z-index: 300;
  align-items: center; justify-content: center;
  backdrop-filter: blur(4px);
}
.modal-overlay.visible { display: flex; }
.modal {
  background: var(--bg2); border-radius: var(--radius);
  width: 90%; max-width: 480px; max-height: 90vh;
  overflow-y: auto; box-shadow: var(--shadow-lg);
  animation: modalIn 0.25s ease;
}
@keyframes modalIn {
  from { opacity: 0; transform: scale(0.94) translateY(20px); }
  to { opacity: 1; transform: scale(1) translateY(0); }
}
.modal-header { display: flex; align-items: center; justify-content: space-between; padding: 18px 20px; border-bottom: 1px solid var(--border); }
.modal-header h3 { font-size: 17px; font-weight: 700; }
.modal-close { background: none; border: none; color: var(--text2); cursor: pointer; font-size: 16px; }
.modal-body { padding: 20px; }
.modal-body input, .modal-body textarea, .modal-body select {
  width: 100%; padding: 10px 14px; border-radius: var(--radius-sm);
  border: 1px solid var(--border); background: var(--bg3); color: var(--text);
  font-family: var(--font); font-size: 14px; outline: none; margin-bottom: 12px;
}
.modal-body input:focus, .modal-body textarea:focus, .modal-body select:focus { border-color: var(--accent); }
.modal-body textarea { resize: vertical; min-height: 100px; }
.modal-body label { font-size: 13px; font-weight: 600; display: block; margin-bottom: 5px; color: var(--text2); }
.modal-footer { display: flex; gap: 10px; justify-content: flex-end; padding: 14px 20px; border-top: 1px solid var(--border); }

/* ===================== TOAST ===================== */
.toast {
  position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%) translateY(80px);
  background: var(--text); color: var(--bg2);
  padding: 12px 22px; border-radius: 99px; font-size: 13px; font-weight: 600;
  z-index: 999; transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
  pointer-events: none; white-space: nowrap;
}
.toast.show { transform: translateX(-50%) translateY(0); }

/* ===================== FOCUS MODE ===================== */
body.focus-mode .sidebar,
body.focus-mode .topbar { display: none; }
body.focus-mode .main-content { margin-left: 0; }
body.focus-mode .page-wrapper { padding: 40px; }

/* ===================== RESPONSIVE ===================== */
@media (max-width: 768px) {
  .sidebar {
    transform: translateX(-100%);
    box-shadow: none;
  }
  .sidebar.open {
    transform: translateX(0);
    box-shadow: var(--shadow-lg);
  }
  .sidebar-close { display: block; }
  .menu-btn { display: block; }
  .main-content { margin-left: 0; }
  .page-wrapper { padding: 16px; }
  .tools-grid { grid-template-columns: 1fr; }
  .notes-grid { grid-template-columns: 1fr; }
  .groups-grid { grid-template-columns: 1fr; }
  .profile-stats { grid-template-columns: repeat(2, 1fr); }
  .pomodoro-display { font-size: 40px; }
  .topbar { padding: 10px 14px; }
}

@media (max-width: 480px) {
  .profile-hero { flex-direction: column; align-items: center; text-align: center; }
  .post-header { flex-wrap: wrap; }
}