:root {
  --bg: #0f1117;
  --bg2: #1a1d27;
  --bg3: #22263a;
  --border: #2e3250;
  --accent: #7c6af7;
  --accent2: #a78bfa;
  --accent-dim: rgba(124,106,247,0.15);
  --green: #22c55e;
  --red: #ef4444;
  --yellow: #f59e0b;
  --text: #e2e8f0;
  --text2: #94a3b8;
  --text3: #64748b;
  --radius: 10px;
  --shadow: 0 4px 24px rgba(0,0,0,0.4);
}

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

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Inter', 'Segoe UI', sans-serif;
  font-size: 15px;
  line-height: 1.6;
  min-height: 100vh;
}

/* ── NAV ── */
.navbar {
  background: var(--bg2);
  border-bottom: 1px solid var(--border);
  padding: 0 24px;
  display: flex;
  align-items: center;
  gap: 8px;
  height: 56px;
  position: sticky;
  top: 0;
  z-index: 100;
}
.navbar .logo {
  font-weight: 700;
  font-size: 16px;
  color: var(--accent2);
  text-decoration: none;
  margin-right: 16px;
  white-space: nowrap;
}
.navbar a {
  color: var(--text2);
  text-decoration: none;
  padding: 6px 10px;
  border-radius: 6px;
  font-size: 13px;
  transition: all .15s;
  white-space: nowrap;
}
.navbar a:hover, .navbar a.active {
  background: var(--accent-dim);
  color: var(--accent2);
}
.navbar .user-badge {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  color: var(--text2);
}
.navbar .user-badge span { color: var(--accent2); font-weight: 600; }
.btn-logout {
  background: none;
  border: 1px solid var(--border);
  color: var(--text2);
  padding: 4px 12px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 12px;
  transition: all .15s;
}
.btn-logout:hover { border-color: var(--red); color: var(--red); }

/* ── LAYOUT ── */
.page-wrap {
  max-width: 1000px;
  margin: 0 auto;
  padding: 40px 24px;
}
.page-title {
  font-size: 26px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 6px;
}
.page-subtitle {
  color: var(--text2);
  font-size: 14px;
  margin-bottom: 32px;
}
.section {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  margin-bottom: 24px;
}
.section-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--accent2);
  text-transform: uppercase;
  letter-spacing: .08em;
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}

/* ── FORM ELEMENTS ── */
.form-group { margin-bottom: 18px; }
.form-group label {
  display: block;
  font-size: 13px;
  color: var(--text2);
  margin-bottom: 6px;
  font-weight: 500;
}
input[type=text], input[type=password], input[type=email],
input[type=number], input[type=date], input[type=search],
textarea, select {
  width: 100%;
  background: var(--bg3);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 10px 14px;
  border-radius: 8px;
  font-size: 14px;
  font-family: inherit;
  outline: none;
  transition: border-color .15s;
}
input:focus, textarea:focus, select:focus {
  border-color: var(--accent);
}
input.error, select.error { border-color: var(--red); }
.error-msg {
  color: var(--red);
  font-size: 12px;
  margin-top: 5px;
  display: none;
}
.error-msg.show { display: block; }
.success-msg {
  color: var(--green);
  font-size: 13px;
  margin-top: 8px;
  display: none;
}
.success-msg.show { display: block; }

/* ── BUTTONS ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all .15s;
  text-decoration: none;
}
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent2); }
.btn-secondary { background: var(--bg3); color: var(--text); border: 1px solid var(--border); }
.btn-secondary:hover { border-color: var(--accent); color: var(--accent2); }
.btn-success { background: #16a34a; color: #fff; }
.btn-success:hover { background: var(--green); }
.btn-danger { background: #dc2626; color: #fff; }
.btn-danger:hover { background: var(--red); }
.btn-warning { background: #d97706; color: #fff; }
.btn-sm { padding: 6px 14px; font-size: 13px; }
.btn:disabled { opacity: .5; cursor: not-allowed; }

/* ── CHECKBOX & RADIO ── */
.check-group, .radio-group { display: flex; flex-direction: column; gap: 10px; }
.check-item, .radio-item {
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  font-size: 14px;
}
.check-item input, .radio-item input { width: 16px; height: 16px; accent-color: var(--accent); cursor: pointer; }

/* ── SELECT / DROPDOWN ── */
select { appearance: none; background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%2394a3b8' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E"); background-repeat: no-repeat; background-position: right 12px center; padding-right: 36px; }

/* ── CUSTOM DROPDOWN ── */
.custom-dropdown { position: relative; width: 100%; }
.custom-dropdown-trigger {
  width: 100%;
  background: var(--bg3);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 10px 14px;
  border-radius: 8px;
  font-size: 14px;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  user-select: none;
  transition: border-color .15s;
}
.custom-dropdown-trigger:hover { border-color: var(--accent); }
.custom-dropdown-trigger.open { border-color: var(--accent); border-radius: 8px 8px 0 0; }
.custom-dropdown-menu {
  position: absolute;
  top: 100%; left: 0; right: 0;
  background: var(--bg3);
  border: 1px solid var(--accent);
  border-top: none;
  border-radius: 0 0 8px 8px;
  z-index: 50;
  display: none;
  max-height: 200px;
  overflow-y: auto;
}
.custom-dropdown-menu.open { display: block; }
.custom-dropdown-item {
  padding: 10px 14px;
  cursor: pointer;
  font-size: 14px;
  transition: background .1s;
}
.custom-dropdown-item:hover { background: var(--accent-dim); color: var(--accent2); }
.custom-dropdown-item.selected { color: var(--accent2); font-weight: 600; }

/* ── TABLE ── */
.data-table { width: 100%; border-collapse: collapse; font-size: 14px; }
.data-table th {
  background: var(--bg3);
  color: var(--text2);
  font-weight: 600;
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid var(--border);
  font-size: 13px;
}
.data-table td { padding: 12px 16px; border-bottom: 1px solid var(--border); color: var(--text); }
.data-table tr:last-child td { border-bottom: none; }
.data-table tr:hover td { background: var(--bg3); }
.badge {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
}
.badge-green { background: rgba(34,197,94,.15); color: var(--green); }
.badge-red { background: rgba(239,68,68,.15); color: var(--red); }
.badge-yellow { background: rgba(245,158,11,.15); color: var(--yellow); }
.badge-blue { background: var(--accent-dim); color: var(--accent2); }

/* ── PAGINATION ── */
.pagination { display: flex; gap: 6px; align-items: center; margin-top: 20px; }
.page-btn {
  width: 34px; height: 34px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--bg3);
  color: var(--text2);
  cursor: pointer;
  font-size: 13px;
  display: flex; align-items: center; justify-content: center;
  transition: all .15s;
}
.page-btn:hover { border-color: var(--accent); color: var(--accent2); }
.page-btn.active { background: var(--accent); border-color: var(--accent); color: #fff; }

/* ── TOOLTIP ── */
.tooltip-wrap { position: relative; display: inline-block; }
.tooltip-box {
  position: absolute;
  bottom: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%);
  background: #1e2235;
  border: 1px solid var(--border);
  color: var(--text);
  padding: 8px 12px;
  border-radius: 6px;
  font-size: 12px;
  white-space: nowrap;
  pointer-events: none;
  opacity: 0;
  transition: opacity .2s;
  z-index: 200;
}
.tooltip-wrap:hover .tooltip-box { opacity: 1; }

/* ── DRAG DROP ── */
.drag-container { display: flex; gap: 20px; flex-wrap: wrap; }
.drop-zone {
  flex: 1;
  min-width: 200px;
  min-height: 150px;
  border: 2px dashed var(--border);
  border-radius: 10px;
  padding: 16px;
  transition: all .2s;
}
.drop-zone.dragover { border-color: var(--accent); background: var(--accent-dim); }
.drop-zone h4 { font-size: 13px; color: var(--text2); margin-bottom: 12px; }
.drag-item {
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 14px;
  margin-bottom: 8px;
  cursor: grab;
  font-size: 14px;
  user-select: none;
  transition: all .15s;
}
.drag-item:active { cursor: grabbing; opacity: .7; }
.drag-item.dragging { opacity: .4; }

/* ── TABS ── */
.tab-list { display: flex; gap: 4px; border-bottom: 1px solid var(--border); margin-bottom: 20px; }
.tab-btn {
  padding: 8px 18px;
  background: none;
  border: none;
  color: var(--text2);
  cursor: pointer;
  font-size: 14px;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  transition: all .15s;
}
.tab-btn:hover { color: var(--text); }
.tab-btn.active { color: var(--accent2); border-bottom-color: var(--accent); font-weight: 600; }
.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* ── ALERT BOXES ── */
.alert {
  padding: 12px 16px;
  border-radius: 8px;
  font-size: 14px;
  margin-bottom: 12px;
  display: none;
}
.alert.show { display: block; }
.alert-success { background: rgba(34,197,94,.1); border: 1px solid rgba(34,197,94,.3); color: var(--green); }
.alert-error { background: rgba(239,68,68,.1); border: 1px solid rgba(239,68,68,.3); color: var(--red); }
.alert-info { background: var(--accent-dim); border: 1px solid rgba(124,106,247,.3); color: var(--accent2); }

/* ── CALENDAR ── */
.calendar-wrap { max-width: 320px; }
.calendar-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 12px; }
.cal-nav { background: none; border: 1px solid var(--border); color: var(--text2); width: 30px; height: 30px; border-radius: 6px; cursor: pointer; font-size: 16px; }
.cal-nav:hover { border-color: var(--accent); color: var(--accent2); }
.calendar-grid { display: grid; grid-template-columns: repeat(7,1fr); gap: 2px; text-align: center; }
.cal-day-name { font-size: 12px; color: var(--text3); padding: 6px 0; font-weight: 600; }
.cal-day {
  padding: 8px 4px; border-radius: 6px; cursor: pointer;
  font-size: 13px; color: var(--text2); transition: all .1s;
}
.cal-day:hover { background: var(--accent-dim); color: var(--accent2); }
.cal-day.today { color: var(--accent2); font-weight: 700; }
.cal-day.selected { background: var(--accent); color: #fff; }
.cal-day.other-month { color: var(--text3); }

/* ── UPLOAD ── */
.upload-zone {
  border: 2px dashed var(--border);
  border-radius: 10px;
  padding: 40px;
  text-align: center;
  cursor: pointer;
  transition: all .2s;
}
.upload-zone:hover, .upload-zone.dragover { border-color: var(--accent); background: var(--accent-dim); }
.upload-zone p { color: var(--text2); font-size: 14px; margin-top: 8px; }
.upload-list { margin-top: 16px; }
.upload-item {
  display: flex; align-items: center; justify-content: space-between;
  background: var(--bg3); border: 1px solid var(--border);
  border-radius: 8px; padding: 10px 14px; margin-bottom: 8px; font-size: 13px;
}
.upload-item .file-name { color: var(--text); }
.upload-item .file-size { color: var(--text2); }

/* ── SCROLL DEMO ── */
.scroll-content { height: 600px; overflow-y: auto; padding: 16px; background: var(--bg3); border-radius: 8px; border: 1px solid var(--border); }
.scroll-item { padding: 16px; border-bottom: 1px solid var(--border); }
.scroll-item:last-child { border-bottom: none; }

/* ── LOGIN PAGE ── */
.login-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg);
}
.login-card {
  width: 100%;
  max-width: 420px;
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 40px;
  box-shadow: var(--shadow);
}
.login-logo {
  text-align: center;
  margin-bottom: 32px;
}
.login-logo h1 { font-size: 22px; font-weight: 700; color: var(--accent2); }
.login-logo p { font-size: 13px; color: var(--text2); margin-top: 4px; }
.login-alert {
  background: rgba(239,68,68,.1);
  border: 1px solid rgba(239,68,68,.3);
  color: var(--red);
  padding: 10px 14px;
  border-radius: 8px;
  font-size: 13px;
  margin-bottom: 16px;
  display: none;
}
.login-alert.show { display: block; }
.btn-login {
  width: 100%;
  padding: 12px;
  font-size: 15px;
  margin-top: 8px;
}
.login-hint {
  text-align: center;
  margin-top: 20px;
  font-size: 12px;
  color: var(--text3);
}

/* ── HOME GRID ── */
.card-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px,1fr)); gap: 16px; }
.practice-card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  text-decoration: none;
  transition: all .2s;
  display: block;
}
.practice-card:hover { border-color: var(--accent); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(124,106,247,.15); }
.practice-card .card-icon { font-size: 28px; margin-bottom: 12px; }
.practice-card .card-title { font-size: 14px; font-weight: 600; color: var(--text); margin-bottom: 4px; }
.practice-card .card-desc { font-size: 12px; color: var(--text2); }

/* ── MISC ── */
.row { display: flex; gap: 16px; flex-wrap: wrap; align-items: flex-start; }
.col { flex: 1; min-width: 200px; }
.mt-12 { margin-top: 12px; }
.mt-20 { margin-top: 20px; }
.result-box {
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px;
  font-size: 13px;
  color: var(--text2);
  min-height: 48px;
  margin-top: 12px;
}
.result-box strong { color: var(--accent2); }
hr.divider { border: none; border-top: 1px solid var(--border); margin: 24px 0; }

/* ── IFRAME PAGE ── */
.iframe-wrap { border-radius: 8px; overflow: hidden; border: 1px solid var(--border); }
iframe { display: block; }

/* ── PROGRESS BAR ── */
.progress-wrap { background: var(--bg3); border-radius: 20px; height: 10px; overflow: hidden; margin-top: 8px; }
.progress-bar { height: 100%; background: var(--accent); border-radius: 20px; transition: width .4s; }