@import url('https://fonts.googleapis.com/css2?family=DM+Sans:ital,opsz,wght@0,9..40,300;0,9..40,400;0,9..40,500;0,9..40,600;0,9..40,700&family=JetBrains+Mono:wght@400;500;600&display=swap');

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

:root {
  --bg: #101216;
  --surface: #181b22;
  --surface-2: #1f2229;
  --surface-3: #262930;
  --border: #2c3038;
  --border-focus: #4f7df0;
  --text: #e8eaed;
  --text-2: #9aa0ac;
  --text-3: #686e7a;
  --blue: #4f7df0;
  --green: #34d399;
  --yellow: #fbbf24;
  --red: #f87171;
  --purple: #a78bfa;
  --teal: #2dd4bf;
}

body {
  font-family: 'DM Sans', system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  display: flex;
  flex-direction: column;
}

/* ---- NAV ---- */
nav {
  height: 52px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(16, 18, 22, 0.92);
  backdrop-filter: blur(12px);
}

.nav-left {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  font-size: 15px;
  letter-spacing: -0.3px;
}

.nav-left span:first-child {
  width: 26px;
  height: 26px;
  background: var(--blue);
  border-radius: 6px;
  display: grid;
  place-items: center;
  font-size: 13px;
  font-weight: 700;
  color: #fff;
}

.db-pill {
  font-size: 11px;
  font-weight: 500;
  padding: 4px 10px;
  border-radius: 100px;
  background: rgba(52, 211, 153, 0.1);
  color: var(--green);
  border: 1px solid rgba(52, 211, 153, 0.2);
  display: flex;
  align-items: center;
  gap: 5px;
}

.db-pill::before {
  content: '';
  width: 5px;
  height: 5px;
  background: var(--green);
  border-radius: 50%;
  animation: blink 2.5s ease infinite;
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}

/* ---- LAYOUT ---- */
.wrap {
  max-width: 1200px;
  margin: 0 auto;
  padding: 32px 20px;
  flex: 1;
  width: 100%;
}

/* ---- PAGE HEADER ---- */
.page-header {
  text-align: center;
  margin-bottom: 32px;
}

.page-title {
  font-size: 28px;
  font-weight: 700;
  letter-spacing: -0.5px;
  margin-bottom: 8px;
}

.page-desc {
  color: var(--text-3);
  font-size: 15px;
  max-width: 600px;
  margin: 0 auto;
}

/* ---- TABS ---- */
.tabs {
  display: flex;
  gap: 2px;
  background: var(--surface);
  border-radius: 10px;
  padding: 3px;
  width: fit-content;
  margin: 0 auto 32px;
}

.tab {
  padding: 8px 22px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-3);
  border: none;
  background: none;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s;
  font-family: inherit;
}

.tab:hover { color: var(--text-2); }
.tab.active {
  background: var(--surface-3);
  color: var(--text);
  box-shadow: 0 1px 3px rgba(0,0,0,0.2);
}

/* ---- PANELS ---- */
.panel { display: none; }
.panel.active { display: block; }

/* ---- QUICK LOOKUP ---- */
.lookup-box {
  max-width: 520px;
  margin: 0 auto;
}

.lookup-heading {
  font-size: 22px;
  font-weight: 600;
  letter-spacing: -0.5px;
  margin-bottom: 4px;
}

.lookup-sub {
  color: var(--text-3);
  font-size: 14px;
  margin-bottom: 20px;
}

.lookup-input-wrap {
  display: flex;
  gap: 8px;
  margin-bottom: 24px;
}

.lookup-input-wrap input {
  flex: 1;
  padding: 11px 14px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-size: 14px;
  font-family: 'JetBrains Mono', monospace;
  outline: none;
  transition: border-color 0.2s;
}

.lookup-input-wrap input::placeholder { color: var(--text-3); font-family: 'DM Sans', sans-serif; }
.lookup-input-wrap input:focus { border-color: var(--blue); }

.lookup-input-wrap button {
  padding: 0 20px;
  background: var(--blue);
  color: #fff;
  border: none;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
  transition: opacity 0.2s;
}

.lookup-input-wrap button:hover { opacity: 0.85; }

.lookup-result {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
}

.lookup-result.not-found {
  border-color: rgba(248, 113, 113, 0.3);
}

.lr-header {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.lr-name {
  font-size: 17px;
  font-weight: 600;
}

.lr-cgpa {
  font-size: 24px;
  font-weight: 700;
  font-family: 'JetBrains Mono', monospace;
}

.lr-cgpa.high { color: var(--green); }
.lr-cgpa.mid { color: var(--yellow); }
.lr-cgpa.low { color: var(--red); }

.lr-body {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--border);
}

.lr-cell {
  background: var(--surface);
  padding: 12px 16px;
}

.lr-cell-label {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  color: var(--text-3);
  margin-bottom: 2px;
}

.lr-cell-value {
  font-size: 14px;
  font-weight: 600;
}

.lr-notfound {
  padding: 24px;
  text-align: center;
  color: var(--red);
  font-weight: 500;
}

/* ---- UPLOAD AREA ---- */
.drop-area {
  border: 1.5px dashed var(--border);
  border-radius: 12px;
  padding: 44px 24px;
  text-align: center;
  cursor: pointer;
  transition: all 0.25s;
  margin-bottom: 24px;
}

.drop-area:hover, .drop-area.over {
  border-color: var(--blue);
  background: rgba(79, 125, 240, 0.04);
}

.drop-area svg {
  width: 32px;
  height: 32px;
  stroke: var(--text-3);
  margin-bottom: 10px;
}

.drop-area:hover svg { stroke: var(--blue); }

.drop-title {
  font-size: 15px;
  font-weight: 500;
  margin-bottom: 4px;
}

.drop-hint {
  font-size: 12px;
  color: var(--text-3);
}

.drop-hint em { color: var(--blue); font-style: normal; font-weight: 500; }

#file-input { display: none; }

/* ---- FILE BAR ---- */
.file-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  margin-bottom: 20px;
  font-size: 13px;
}

.file-bar .name { font-weight: 600; }
.file-bar .meta { color: var(--text-3); flex: 1; }
.file-bar .x-btn {
  background: none;
  border: 1px solid var(--border);
  color: var(--text-3);
  border-radius: 6px;
  padding: 4px 10px;
  font-size: 11px;
  cursor: pointer;
  font-family: inherit;
  font-weight: 500;
  transition: all 0.15s;
}

.file-bar .x-btn:hover { border-color: var(--red); color: var(--red); }

/* ---- STATS ---- */
.stats-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 10px;
  margin-bottom: 20px;
}

.s-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px 16px;
}

.s-label {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-3);
  font-weight: 500;
  margin-bottom: 2px;
}

.s-val {
  font-size: 20px;
  font-weight: 700;
  font-family: 'JetBrains Mono', monospace;
  letter-spacing: -0.5px;
}

.s-val.c-blue { color: var(--blue); }
.s-val.c-green { color: var(--green); }
.s-val.c-red { color: var(--red); }
.s-val.c-yellow { color: var(--yellow); }
.s-val.c-purple { color: var(--purple); }
.s-val.c-teal { color: var(--teal); }

/* ---- CHART ---- */
.chart-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px;
  margin-bottom: 20px;
}

.chart-title {
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 16px;
  color: var(--text-2);
}

.chart-bars {
  display: flex;
  align-items: flex-end;
  gap: 6px;
  height: 120px;
  padding-bottom: 24px;
  position: relative;
}

.chart-bar-col {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  height: 100%;
  justify-content: flex-end;
  position: relative;
}

.chart-bar {
  width: 100%;
  max-width: 48px;
  border-radius: 4px 4px 0 0;
  transition: height 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
  min-height: 2px;
  position: relative;
  cursor: default;
}

.chart-bar:hover { filter: brightness(1.2); }

.chart-bar-label {
  position: absolute;
  bottom: -22px;
  font-size: 10px;
  color: var(--text-3);
  white-space: nowrap;
  font-weight: 500;
}

.chart-bar-count {
  position: absolute;
  top: -18px;
  font-size: 10px;
  font-weight: 600;
  color: var(--text-2);
}

/* ---- CONTROLS ---- */
.ctrls {
  display: flex;
  gap: 8px;
  margin-bottom: 14px;
  flex-wrap: wrap;
  align-items: center;
}

.ctrls input[type="text"] {
  flex: 1;
  min-width: 200px;
  padding: 9px 12px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 7px;
  color: var(--text);
  font-size: 13px;
  font-family: inherit;
  outline: none;
  transition: border-color 0.2s;
}

.ctrls input[type="text"]::placeholder { color: var(--text-3); }
.ctrls input[type="text"]:focus { border-color: var(--blue); }

.ctrls select, .ctrls input[type="number"] {
  padding: 9px 12px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 7px;
  color: var(--text);
  font-size: 12px;
  font-family: inherit;
  outline: none;
  cursor: pointer;
  transition: border-color 0.2s;
}

.ctrls select:focus, .ctrls input[type="number"]:focus { border-color: var(--blue); }
.ctrls select option { background: var(--surface); }

.ctrls input[type="number"] {
  width: 72px;
  cursor: text;
}

.ctrls .sep {
  color: var(--text-3);
  font-size: 12px;
}

/* ---- ACTIONS ---- */
.act-row {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
  align-items: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border-radius: 7px;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  font-family: inherit;
  transition: all 0.15s;
}

.btn svg { width: 14px; height: 14px; }

.btn-fill {
  background: var(--green);
  color: #0a0e12;
}

.btn-fill:hover { opacity: 0.85; }

.btn-ghost {
  background: none;
  border: 1px solid var(--border);
  color: var(--text-2);
}

.btn-ghost:hover { border-color: var(--text-3); color: var(--text); }

.showing {
  margin-left: auto;
  font-size: 12px;
  color: var(--text-3);
}

.showing b { color: var(--text-2); font-weight: 600; }

/* ---- BRANCH CHIPS ---- */
.chips {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}

.chip {
  font-size: 11px;
  font-weight: 500;
  padding: 4px 10px;
  border-radius: 6px;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text-3);
  cursor: pointer;
  transition: all 0.15s;
  font-family: inherit;
}

.chip b { font-weight: 600; color: var(--text-2); margin-left: 3px; }

.chip:hover, .chip.on {
  border-color: var(--blue);
  color: var(--blue);
  background: rgba(79, 125, 240, 0.06);
}

/* ---- TABLE ---- */
.tbl-wrap {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
}

.tbl-scroll {
  overflow-x: auto;
  max-height: 65vh;
  overflow-y: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
}

thead { position: sticky; top: 0; z-index: 5; }

thead th {
  background: var(--surface-2);
  padding: 10px 14px;
  text-align: left;
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  color: var(--text-3);
  border-bottom: 1px solid var(--border);
  cursor: pointer;
  user-select: none;
  white-space: nowrap;
  transition: color 0.15s;
}

thead th:hover { color: var(--text-2); }

thead th.asc, thead th.desc { color: var(--blue); }

thead th .arr {
  margin-left: 3px;
  opacity: 0.35;
  font-size: 9px;
}

thead th.asc .arr, thead th.desc .arr { opacity: 1; }

tbody tr {
  border-bottom: 1px solid rgba(44, 48, 56, 0.5);
  transition: background 0.1s;
}

tbody tr:hover { background: rgba(79, 125, 240, 0.03); }

tbody td {
  padding: 9px 14px;
  font-size: 13px;
  color: var(--text-2);
}

.col-idx { color: var(--text-3); font-size: 11px; font-weight: 500; }
.col-name { color: var(--text); font-weight: 500; }
.col-roll { font-family: 'JetBrains Mono', monospace; font-size: 12px; letter-spacing: 0.2px; }

.col-cgpa {
  font-weight: 700;
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
}

.col-cgpa.high { color: var(--green); }
.col-cgpa.mid { color: var(--yellow); }
.col-cgpa.low { color: var(--red); }

.badge-br {
  font-size: 10px;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 4px;
  background: rgba(79, 125, 240, 0.08);
  color: var(--blue);
  letter-spacing: 0.3px;
}

.col-st { font-weight: 600; font-size: 11px; }
.col-st.ok { color: var(--green); }
.col-st.no { color: var(--red); }

/* ---- EMPTY ---- */
.empty {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-3);
}

.empty p { font-size: 14px; margin-top: 6px; }

/* ---- TOAST ---- */
.toasts {
  position: fixed;
  bottom: 16px;
  right: 16px;
  z-index: 999;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.toast {
  padding: 10px 16px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 12px;
  font-weight: 500;
  color: var(--text);
  box-shadow: 0 8px 24px rgba(0,0,0,0.35);
  animation: t-in 0.35s cubic-bezier(0.16, 1, 0.3, 1);
  max-width: 340px;
  display: flex;
  align-items: center;
  gap: 8px;
}

@keyframes t-in {
  from { transform: translateY(12px) scale(0.96); opacity: 0; }
  to { transform: none; opacity: 1; }
}

/* ---- LOADING BAR ---- */
.ld-bar {
  position: fixed;
  top: 52px;
  left: 0;
  width: 100%;
  height: 2px;
  z-index: 100;
  overflow: hidden;
  opacity: 0;
  transition: opacity 0.2s;
}

.ld-bar.on { opacity: 1; }

.ld-bar::after {
  content: '';
  display: block;
  width: 30%;
  height: 100%;
  background: var(--blue);
  border-radius: 1px;
  animation: ld-slide 1s ease-in-out infinite;
}

@keyframes ld-slide {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(430%); }
}

.hidden { display: none !important; }

/* ---- FOOTER ---- */
.app-footer {
  margin-top: auto;
  padding: 40px 24px;
  border-top: 1px solid var(--border);
  text-align: center;
}

.footer-text {
  font-size: 13px;
  color: var(--text-2);
  margin-bottom: 12px;
  font-weight: 500;
}

.footer-links {
  display: flex;
  gap: 20px;
  justify-content: center;
}

.footer-links a {
  color: var(--text-3);
  text-decoration: none;
  font-size: 13px;
  font-weight: 500;
  transition: color 0.2s;
}

.footer-links a:hover {
  color: var(--blue);
}

/* ---- RESPONSIVE ---- */
@media (max-width: 640px) {
  .wrap { padding: 20px 14px; }
  .stats-row { grid-template-columns: repeat(2, 1fr); }
  .ctrls { flex-direction: column; align-items: stretch; }
  .ctrls input[type="text"] { min-width: unset; }
  .act-row { flex-direction: column; align-items: stretch; }
  .showing { margin-left: 0; text-align: center; }
  .tabs { width: 100%; }
  .tab { flex: 1; text-align: center; }
  .lookup-heading { font-size: 19px; }
}

/* scrollbar */
::-webkit-scrollbar { width: 5px; height: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-3); }