:root {
  --bg: #0f1923;
  --bg2: #162030;
  --bg3: #1c2a3a;
  --card: #1a2535;
  --border: rgba(0,200,255,0.12);
  --border2: rgba(0,200,255,0.28);
  --accent: #00c8ff;
  --accent2: #00ffa3;
  --accent3: #ff6b35;
  --text: #e8f4f8;
  --text2: #8ab0c0;
  --text3: #4a7080;
  --danger: #ff4b4b;
  --warning: #ffb830;
  --success: #00ffa3;
  --sidebar-w: 230px;
  --radius: 10px;
  --font-mono: 'Space Mono', monospace;
  --font-body: 'DM Sans', sans-serif;
}

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

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 15px;
  min-height: 100vh;
}

/* ===== AUTH ===== */
#auth-screen {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  padding: 1rem;
}

.auth-bg {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 20% 50%, rgba(0,200,255,0.06) 0%, transparent 60%),
              radial-gradient(ellipse at 80% 20%, rgba(0,255,163,0.04) 0%, transparent 50%);
}

.auth-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(0,200,255,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,200,255,0.04) 1px, transparent 1px);
  background-size: 40px 40px;
  mask-image: radial-gradient(ellipse at center, black 40%, transparent 80%);
}

.auth-container {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 400px;
}

.auth-brand {
  text-align: center;
  margin-bottom: 2rem;
}
.auth-logo {
  font-size: 48px;
  color: var(--accent);
  display: block;
  margin-bottom: 0.5rem;
  animation: pulse 3s ease-in-out infinite;
}
@keyframes pulse {
  0%,100% { opacity: 1; }
  50% { opacity: 0.6; }
}
.auth-title {
  font-family: var(--font-mono);
  font-size: 28px;
  font-weight: 700;
  color: var(--text);
  letter-spacing: 0.05em;
}
.auth-sub {
  font-size: 13px;
  color: var(--text3);
  margin-top: 4px;
  font-family: var(--font-mono);
}

.auth-card {
  background: var(--bg2);
  border: 1px solid var(--border2);
  border-radius: 16px;
  padding: 2rem;
  backdrop-filter: blur(12px);
}

.auth-tabs {
  display: flex;
  gap: 0;
  margin-bottom: 1.5rem;
  background: var(--bg3);
  border-radius: 8px;
  padding: 3px;
}
.auth-tab {
  flex: 1;
  padding: 0.5rem;
  border: none;
  background: transparent;
  color: var(--text2);
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 500;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.2s;
}
.auth-tab.active {
  background: var(--bg2);
  color: var(--accent);
  border: 1px solid var(--border2);
}

.auth-form.hidden { display: none; }

.auth-error {
  background: rgba(255,75,75,0.1);
  border: 1px solid rgba(255,75,75,0.3);
  border-radius: 8px;
  padding: 0.6rem 0.9rem;
  font-size: 13px;
  color: var(--danger);
  margin-bottom: 1rem;
}
.auth-error.hidden { display: none; }

.auth-success {
  background: rgba(0,255,163,0.08);
  border: 1px solid rgba(0,255,163,0.3);
  border-radius: 8px;
  padding: 0.6rem 0.9rem;
  font-size: 13px;
  color: var(--success);
  margin-bottom: 1rem;
}
.auth-success.hidden { display: none; }

.auth-footer {
  text-align: center;
  font-size: 12px;
  color: var(--text3);
  margin-top: 1.5rem;
  font-family: var(--font-mono);
}

.btn-full { width: 100%; justify-content: center; }

/* ===== LAYOUT ===== */
#app { display: flex; min-height: 100vh; }
#app.hidden { display: none; }

#sidebar {
  width: var(--sidebar-w);
  background: var(--bg2);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  padding: 1.5rem 0;
  position: fixed;
  top: 0; left: 0;
  height: 100vh;
  z-index: 100;
  transition: transform 0.25s ease;
  overflow-y: auto;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 1rem;
}
.brand-icon { font-size: 22px; color: var(--accent); }
.brand-name { font-family: var(--font-mono); font-size: 16px; font-weight: 700; color: var(--accent); letter-spacing: 0.05em; }

.nav-links { flex: 1; display: flex; flex-direction: column; gap: 2px; padding: 0 0.75rem; }
.nav-bottom { padding: 0.75rem 0.75rem 0; border-top: 1px solid var(--border); display: flex; flex-direction: column; gap: 2px; }

.nav-btn {
  display: flex; align-items: center; gap: 10px;
  padding: 0.6rem 0.75rem;
  border: none; background: transparent;
  color: var(--text2); font-family: var(--font-body);
  font-size: 14px; font-weight: 500;
  border-radius: var(--radius); cursor: pointer;
  width: 100%; text-align: left; transition: all 0.15s;
}
.nav-btn:hover { background: var(--bg3); color: var(--text); }
.nav-btn.active { background: rgba(0,200,255,0.1); color: var(--accent); border-left: 2px solid var(--accent); }
.nav-icon { font-size: 15px; width: 18px; text-align: center; }

.teacher-chip {
  display: flex; align-items: center; gap: 10px;
  padding: 0.6rem 0.75rem;
  margin-bottom: 4px;
}
.teacher-avatar {
  width: 32px; height: 32px; border-radius: 50%;
  background: rgba(0,200,255,0.15);
  border: 1px solid var(--border2);
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-mono); font-size: 12px; font-weight: 700;
  color: var(--accent); flex: none;
}
.teacher-info { overflow: hidden; }
.teacher-name { font-size: 13px; font-weight: 600; color: var(--text); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.teacher-role { font-size: 11px; color: var(--text3); font-family: var(--font-mono); }

#main {
  margin-left: var(--sidebar-w);
  flex: 1; padding: 2rem;
  min-height: 100vh; max-width: 1200px;
}

#mobile-header {
  display: none;
  position: fixed; top: 0; left: 0; right: 0;
  height: 56px; background: var(--bg2);
  border-bottom: 1px solid var(--border);
  align-items: center; justify-content: space-between;
  padding: 0 1rem; z-index: 200;
}
#mobile-menu-btn { background: none; border: none; color: var(--text); font-size: 22px; cursor: pointer; }

/* ===== PAGES ===== */
.page { display: none; }
.page.active { display: block; }

.page-header {
  display: flex; align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem; flex-wrap: wrap; gap: 0.75rem;
}
.page-header h1 { font-family: var(--font-mono); font-size: 22px; color: var(--text); letter-spacing: -0.02em; }
.header-meta { font-size: 13px; color: var(--text2); font-family: var(--font-mono); }

/* ===== CARDS ===== */
.card { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.25rem; }
.card-title { font-family: var(--font-mono); font-size: 11px; text-transform: uppercase; letter-spacing: 0.1em; color: var(--accent); margin-bottom: 1rem; }
.mt { margin-top: 1.25rem; }
.mt-sm { margin-top: 0.5rem; }

/* ===== STATS ===== */
.stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px,1fr)); gap: 1rem; margin-bottom: 1.25rem; }
.stat-card { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 1rem; }
.stat-label { font-size: 11px; color: var(--text3); text-transform: uppercase; letter-spacing: 0.08em; font-family: var(--font-mono); margin-bottom: 4px; }
.stat-value { font-size: 28px; font-weight: 600; color: var(--text); font-family: var(--font-mono); }
.stat-sub { font-size: 12px; color: var(--text2); margin-top: 2px; }

.dash-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1.25rem; }

/* ===== BUTTONS ===== */
.btn-primary {
  background: var(--accent); color: var(--bg);
  border: none; border-radius: var(--radius);
  padding: 0.55rem 1.1rem; font-family: var(--font-body);
  font-size: 14px; font-weight: 600; cursor: pointer;
  transition: opacity 0.15s, transform 0.1s;
  display: inline-flex; align-items: center; gap: 6px;
}
.btn-primary:hover { opacity: 0.85; }
.btn-primary:active { transform: scale(0.97); }
.btn-primary:disabled { opacity: 0.5; cursor: not-allowed; }

.btn-secondary {
  background: rgba(0,200,255,0.1); color: var(--accent);
  border: 1px solid var(--border2); border-radius: var(--radius);
  padding: 0.55rem 1.1rem; font-family: var(--font-body);
  font-size: 14px; font-weight: 500; cursor: pointer; transition: background 0.15s;
}
.btn-secondary:hover { background: rgba(0,200,255,0.18); }

.btn-ghost {
  background: transparent; color: var(--text2);
  border: 1px solid var(--border); border-radius: var(--radius);
  padding: 0.55rem 1.1rem; font-family: var(--font-body);
  font-size: 14px; cursor: pointer; transition: all 0.15s;
}
.btn-ghost:hover { border-color: var(--border2); color: var(--text); }
.btn-danger {
  background: rgba(255,75,75,0.12); color: var(--danger);
  border: 1px solid rgba(255,75,75,0.3); border-radius: var(--radius);
  padding: 0.55rem 1.1rem; font-size: 14px; cursor: pointer;
}
.btn-sm { padding: 0.3rem 0.7rem; font-size: 12px; }

/* ===== FORMS ===== */
.form-group { margin-bottom: 1rem; }
.form-group label { display: block; font-size: 12px; color: var(--text2); margin-bottom: 5px; text-transform: uppercase; letter-spacing: 0.06em; }
.form-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px,1fr)); gap: 1rem; }

input[type="text"], input[type="number"], input[type="email"], input[type="password"], select, textarea {
  width: 100%; background: var(--bg3); border: 1px solid var(--border);
  border-radius: 8px; color: var(--text); font-family: var(--font-body);
  font-size: 14px; padding: 0.55rem 0.8rem; outline: none; transition: border-color 0.15s;
}
input:focus, select:focus, textarea:focus { border-color: var(--accent); }
select option { background: var(--bg3); }
textarea { resize: vertical; }
.hint { font-size: 12px; color: var(--text3); margin-bottom: 1rem; }

.search-bar { margin-bottom: 1.25rem; }
.search-bar input { max-width: 360px; }

/* ===== STUDENTS ===== */
.students-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px,1fr)); gap: 1rem; }
.student-card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.25rem;
  transition: border-color 0.2s, transform 0.15s; position: relative;
}
.student-card:hover { border-color: var(--border2); transform: translateY(-2px); }
.student-avatar {
  width: 48px; height: 48px; border-radius: 50%;
  background: linear-gradient(135deg, rgba(0,200,255,0.2), rgba(0,255,163,0.2));
  border: 2px solid var(--border2);
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-mono); font-size: 16px; font-weight: 700;
  color: var(--accent); margin-bottom: 0.75rem;
}
.student-name { font-size: 15px; font-weight: 600; color: var(--text); }
.student-meta { font-size: 12px; color: var(--text2); margin-top: 3px; }
.student-score-badge { position: absolute; top: 1rem; right: 1rem; }
.student-actions { display: flex; gap: 6px; margin-top: 0.75rem; flex-wrap: wrap; }

/* ===== WEEK NAV ===== */
.week-nav { display: flex; align-items: center; gap: 1rem; margin-bottom: 1.25rem; }
.week-label { font-family: var(--font-mono); font-size: 14px; color: var(--accent); }

/* ===== SCORES TABLE ===== */
#scores-table-wrap { overflow-x: auto; margin-top: 1rem; }
.scores-table { width: 100%; border-collapse: collapse; font-size: 14px; }
.scores-table th {
  background: var(--bg3); color: var(--text2);
  font-size: 11px; text-transform: uppercase; letter-spacing: 0.06em;
  padding: 0.6rem 0.75rem; text-align: left;
  border-bottom: 1px solid var(--border); font-family: var(--font-mono); white-space: nowrap;
}
.scores-table td { padding: 0.6rem 0.75rem; border-bottom: 1px solid var(--border); color: var(--text); }
.scores-table tr:hover td { background: var(--bg3); }

.grade-badge { display: inline-block; padding: 2px 8px; border-radius: 4px; font-family: var(--font-mono); font-size: 12px; font-weight: 700; }
.grade-A { background: rgba(0,255,163,0.12); color: var(--accent2); }
.grade-B { background: rgba(0,200,255,0.12); color: var(--accent); }
.grade-C { background: rgba(255,184,48,0.12); color: var(--warning); }
.grade-D { background: rgba(255,107,53,0.12); color: var(--accent3); }
.grade-F { background: rgba(255,75,75,0.12); color: var(--danger); }

.category-chips { display: flex; gap: 8px; flex-wrap: wrap; }
.chip { padding: 4px 10px; border-radius: 20px; font-size: 12px; background: rgba(0,200,255,0.08); border: 1px solid var(--border2); color: var(--accent); font-family: var(--font-mono); }

/* ===== NOTES ===== */
.notes-filter { display: flex; gap: 0.75rem; margin-bottom: 1.25rem; flex-wrap: wrap; }
.notes-filter select { width: auto; min-width: 180px; }
#notes-list { display: flex; flex-direction: column; gap: 0.75rem; }
.note-card { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 1rem 1.25rem; }
.note-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 0.5rem; flex-wrap: wrap; gap: 0.5rem; }
.note-student-name { font-weight: 600; font-size: 14px; }
.note-meta { font-size: 12px; color: var(--text3); font-family: var(--font-mono); }
.note-category-tag { font-size: 11px; padding: 2px 8px; border-radius: 4px; font-family: var(--font-mono); text-transform: uppercase; letter-spacing: 0.05em; }
.tag-general { background: rgba(138,176,192,0.12); color: var(--text2); }
.tag-behavior { background: rgba(0,200,255,0.1); color: var(--accent); }
.tag-technical { background: rgba(0,255,163,0.1); color: var(--accent2); }
.tag-creativity { background: rgba(255,184,48,0.1); color: var(--warning); }
.tag-leadership { background: rgba(138,100,255,0.12); color: #a08aff; }
.tag-concern { background: rgba(255,75,75,0.1); color: var(--danger); }
.tag-achievement { background: rgba(255,107,53,0.1); color: var(--accent3); }
.note-text { font-size: 14px; color: var(--text); line-height: 1.6; }
.note-actions { margin-top: 0.5rem; display: flex; gap: 6px; }

/* ===== MODALS ===== */
.modal-overlay { position: fixed; inset: 0; background: rgba(0,0,0,0.75); z-index: 300; display: flex; align-items: center; justify-content: center; padding: 1rem; backdrop-filter: blur(4px); }
.modal-overlay.hidden { display: none; }
.modal { background: var(--bg2); border: 1px solid var(--border2); border-radius: 14px; width: 100%; max-width: 480px; max-height: 90vh; overflow-y: auto; }
.modal-wide { max-width: 720px; }
.modal.hidden { display: none; }
.modal-header { display: flex; align-items: center; justify-content: space-between; padding: 1.25rem 1.5rem; border-bottom: 1px solid var(--border); }
.modal-header h2 { font-family: var(--font-mono); font-size: 16px; }
.modal-close { background: none; border: none; color: var(--text2); font-size: 18px; cursor: pointer; padding: 4px; }
.modal-close:hover { color: var(--text); }
.modal-body { padding: 1.25rem 1.5rem; }
.modal-footer { display: flex; gap: 0.75rem; justify-content: flex-end; padding: 1rem 1.5rem; border-top: 1px solid var(--border); }

/* ===== SCORE FIELDS ===== */
.score-field { display: flex; align-items: center; gap: 1rem; margin-bottom: 0.75rem; }
.score-field label { flex: 1; font-size: 13px; color: var(--text2); }
.score-field input { width: 80px; flex: none; text-align: center; }
.score-field .max-pts { font-size: 12px; color: var(--text3); font-family: var(--font-mono); }
.score-total { margin-top: 0.5rem; font-family: var(--font-mono); font-size: 14px; color: var(--accent); text-align: right; padding: 0.5rem; background: var(--bg3); border-radius: 6px; }

/* ===== REPORT ===== */
#report-output { margin-top: 1.5rem; }
.report-card { background: var(--card); border: 1px solid var(--border2); border-radius: var(--radius); padding: 2rem; }
.report-header { display: flex; align-items: flex-start; justify-content: space-between; margin-bottom: 2rem; flex-wrap: wrap; gap: 1rem; }
.report-student-info h2 { font-family: var(--font-mono); font-size: 22px; color: var(--accent); }
.report-student-info p { font-size: 13px; color: var(--text2); margin-top: 3px; }
.report-period { font-family: var(--font-mono); font-size: 12px; color: var(--text3); text-align: right; }
.report-section { margin-bottom: 2rem; }
.report-section-title { font-family: var(--font-mono); font-size: 11px; text-transform: uppercase; letter-spacing: 0.1em; color: var(--accent); border-bottom: 1px solid var(--border); padding-bottom: 0.5rem; margin-bottom: 1rem; }
.report-metrics { display: grid; grid-template-columns: repeat(auto-fit, minmax(110px,1fr)); gap: 0.75rem; }
.report-metric { background: var(--bg3); border-radius: 8px; padding: 0.75rem; text-align: center; }
.report-metric .val { font-family: var(--font-mono); font-size: 20px; font-weight: 700; }
.report-metric .lbl { font-size: 11px; color: var(--text3); text-transform: uppercase; letter-spacing: 0.05em; margin-top: 2px; }
.trend-bar { display: flex; align-items: center; gap: 8px; margin-bottom: 6px; }
.trend-bar-label { width: 100px; font-size: 12px; color: var(--text2); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.trend-bar-track { flex: 1; height: 8px; background: var(--bg3); border-radius: 4px; overflow: hidden; }
.trend-bar-fill { height: 100%; border-radius: 4px; background: var(--accent); }
.trend-bar-val { width: 36px; font-size: 12px; font-family: var(--font-mono); color: var(--text2); text-align: right; }

/* ===== CATEGORIES ===== */
.category-row { display: flex; align-items: center; gap: 0.75rem; margin-bottom: 0.5rem; }
.category-row input[type="text"] { flex: 1; }
.category-row input[type="number"] { width: 70px; flex: none; }

/* ===== ACTIVITY ===== */
.activity-item { display: flex; align-items: center; gap: 10px; padding: 6px 0; border-bottom: 1px solid var(--border); font-size: 13px; }
.activity-item:last-child { border-bottom: none; }
.activity-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--accent); flex: none; }
.performer-row { display: flex; align-items: center; gap: 10px; padding: 6px 0; font-size: 13px; }
.performer-rank { font-family: var(--font-mono); font-size: 11px; color: var(--text3); width: 20px; }
.performer-name { flex: 1; }
.performer-score { font-family: var(--font-mono); font-size: 13px; color: var(--accent2); }

/* ===== STUDENT CARD ===== */
.student-card-full { padding: 0.5rem; }
.sc-header { display: flex; align-items: center; gap: 1.25rem; margin-bottom: 1.5rem; }
.sc-avatar { width: 64px; height: 64px; border-radius: 50%; background: linear-gradient(135deg, rgba(0,200,255,0.2), rgba(0,255,163,0.2)); border: 2px solid var(--border2); display: flex; align-items: center; justify-content: center; font-family: var(--font-mono); font-size: 22px; font-weight: 700; color: var(--accent); }
.sc-info h2 { font-family: var(--font-mono); font-size: 20px; }
.sc-info p { font-size: 13px; color: var(--text2); margin-top: 2px; }
.sc-stats { display: grid; grid-template-columns: repeat(3,1fr); gap: 0.75rem; margin-bottom: 1.5rem; }
.sc-stat { background: var(--bg3); border-radius: 8px; padding: 0.75rem; text-align: center; }
.sc-stat .v { font-family: var(--font-mono); font-size: 20px; }
.sc-stat .l { font-size: 11px; color: var(--text3); text-transform: uppercase; letter-spacing: 0.05em; }

/* ===== GLOBAL LOADER ===== */
.global-loader { position: fixed; inset: 0; background: rgba(15,25,35,0.85); z-index: 500; display: flex; align-items: center; justify-content: center; }
.global-loader.hidden { display: none; }
.loader-spinner { width: 36px; height: 36px; border: 3px solid var(--border); border-top-color: var(--accent); border-radius: 50%; animation: spin 0.8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

.loading-state { color: var(--text3); font-size: 14px; padding: 2rem; }

/* ===== EMPTY / TOAST ===== */
.empty-state { text-align: center; padding: 2.5rem 1rem; color: var(--text3); }
.empty-state .icon { font-size: 40px; margin-bottom: 0.75rem; }
.empty-state p { font-size: 14px; }
.empty-state.hidden { display: none; }

.toast { position: fixed; bottom: 2rem; right: 2rem; background: var(--bg3); border: 1px solid var(--border2); border-radius: var(--radius); padding: 0.75rem 1.25rem; font-size: 14px; color: var(--text); z-index: 999; max-width: 300px; }
.toast.hidden { display: none; }
.toast.success { border-color: var(--success); color: var(--success); }
.toast.error { border-color: var(--danger); color: var(--danger); }

/* ===== SIDEBAR OVERLAY ===== */
.sidebar-overlay { display: none; position: fixed; inset: 0; background: rgba(0,0,0,0.5); z-index: 99; }
.sidebar-overlay.show { display: block; }

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
  #sidebar { transform: translateX(-100%); }
  #sidebar.open { transform: translateX(0); }
  #mobile-header { display: flex; }
  #main { margin-left: 0; padding: 1rem; padding-top: 72px; }
  .dash-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2,1fr); }
}

/* ===== PRINT ===== */
@media print {
  #sidebar, #mobile-header, .modal-footer, .page-header button, #auth-screen { display: none !important; }
  #app.hidden { display: flex !important; }
  body { background: white; color: #111; }
  :root { --bg: white; --bg2: #f9f9f9; --bg3: #f0f0f0; --card: white; --text: #111; --text2: #444; --text3: #888; --accent: #0066aa; --accent2: #007755; --border: #ddd; --border2: #bbb; }
}

::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--bg2); }
::-webkit-scrollbar-thumb { background: var(--bg3); border-radius: 3px; }