/* =========================================================================
   study.css — minimalist shared shell for /study/* and past-papers
   Goals:
     - Single light/dark surface, no nested cards
     - Quiet borders, generous whitespace, monospace credits/grades
     - Mobile-first; never overflow horizontally on a 360 px viewport
   ========================================================================= */

.study-page {
  max-width: 720px;
  margin: 0 auto;
  padding: 28px 18px 80px;
}

.study-head {
  margin: 0 0 22px;
}
.study-head h1 {
  font-size: 26px;
  font-weight: 800;
  letter-spacing: -0.01em;
  margin: 0 0 4px;
  color: var(--text);
}
.study-head p {
  font-size: 13px;
  color: var(--text3);
  margin: 0;
  line-height: 1.5;
}

/* ── Tabs (text-only, no chrome) ───────────────────────────── */
.study-tabs {
  display: flex;
  gap: 4px;
  margin: 0 -4px 16px;
  border-bottom: 1px solid var(--border);
}
.study-tab {
  background: transparent;
  border: 0;
  color: var(--text3);
  padding: 10px 14px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  transition: color 0.15s, border-color 0.15s;
}
.study-tab:hover { color: var(--text); }
.study-tab.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

/* ── Single-column row stack ───────────────────────────────── */
.row-list {
  display: flex;
  flex-direction: column;
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  margin-bottom: 14px;
}
.row-list > * {
  background: var(--bg);
  padding: 10px 14px;
}

/* Tight grid row used by SGPA + timetable + papers */
.study-row {
  display: grid;
  grid-template-columns: 1fr 64px 100px 32px;
  gap: 8px;
  align-items: center;
}
.study-row input,
.study-row select,
.study-field input,
.study-field select {
  background: transparent;
  border: 0;
  border-bottom: 1px dashed transparent;
  font: inherit;
  color: var(--text);
  padding: 4px 2px;
  width: 100%;
  min-width: 0;
}
.study-row input:focus,
.study-row select:focus,
.study-field input:focus,
.study-field select:focus {
  outline: 0;
  border-bottom-color: var(--accent);
}
.study-row input[type="number"],
.study-row select { font-variant-numeric: tabular-nums; }

/* Generic labelled field (target tab, papers form) */
.study-field {
  display: grid;
  grid-template-columns: 130px 1fr;
  align-items: center;
  gap: 12px;
}
.study-field > span {
  font-size: 13px;
  color: var(--text3);
  font-weight: 600;
}
.study-field input,
.study-field select {
  border-bottom: 1px solid var(--border);
  padding: 8px 0;
}
.study-field textarea {
  background: transparent;
  border: 0;
  border-bottom: 1px solid var(--border);
  font: inherit;
  color: var(--text);
  padding: 8px 0;
  width: 100%;
  resize: vertical;
  min-height: 60px;
}

.study-row-meta {
  font-size: 12px;
  color: var(--text3);
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.icon-btn {
  background: transparent;
  border: 0;
  color: var(--text3);
  width: 32px;
  height: 32px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 16px;
  line-height: 1;
}
.icon-btn:hover { background: var(--hover); color: var(--text); }
.icon-btn.danger:hover { background: rgba(176, 0, 32, 0.1); color: #b00020; }

/* ── Buttons ───────────────────────────────────────────────── */
.study-actions {
  display: flex;
  gap: 6px;
  margin: 0 0 18px;
  flex-wrap: wrap;
}
.study-btn-quiet {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text2);
  padding: 6px 12px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  text-transform: lowercase;
  letter-spacing: 0.02em;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
}
.study-btn-quiet:hover {
  background: var(--hover);
  color: var(--text);
}
.study-btn {
  background: var(--accent);
  color: #fff;
  border: 0;
  padding: 10px 18px;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
}
.study-btn:hover { filter: brightness(1.05); }
.study-btn:disabled { opacity: 0.5; cursor: not-allowed; }

/* ── Result block (big number, quiet meta) ─────────────────── */
.study-result {
  margin: 6px 0 0;
  padding: 18px 0 4px;
  border-top: 1px solid var(--border);
}
.study-result .big {
  font-size: 44px;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--accent);
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
}
.study-result .label {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text3);
  font-weight: 700;
  margin-bottom: 4px;
}
.study-result .meta {
  font-size: 13px;
  color: var(--text3);
  margin-top: 8px;
  line-height: 1.5;
}
.study-result .warn { color: #b00020; }

.study-foot {
  text-align: center;
  font-size: 11px;
  color: var(--text3);
  margin: 28px 0 0;
}

/* ── Saved-semester list ───────────────────────────────────── */
.sem-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
}
.sem-row strong { font-size: 15px; color: var(--text); }
.sem-row .meta { font-size: 12px; color: var(--text3); margin-top: 2px; }

/* ── Timetable add-row + list ──────────────────────────────── */
.tt-add-row { grid-template-columns: 1fr 60px 80px 80px 80px; }
.tt-list { margin-top: 18px; }

/* ── Timetable grid (minimal) ──────────────────────────────── */
.tt-wrap { overflow-x: auto; margin: 0 -18px; padding: 0 18px; }
.tt {
  display: grid;
  grid-template-columns: 56px repeat(6, minmax(72px, 1fr));
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
  font-size: 11px;
  min-width: 480px;
}
.tt > div {
  background: var(--bg);
  padding: 6px 4px;
  min-height: 38px;
}
.tt .tt-h {
  background: transparent;
  font-weight: 700;
  color: var(--text3);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  text-align: center;
  font-size: 10px;
}
.tt .tt-t {
  background: transparent;
  color: var(--text3);
  font-variant-numeric: tabular-nums;
  text-align: right;
  padding-right: 8px;
  font-size: 10px;
}
.tt .tt-c {
  background: var(--accent-bg, rgba(212, 112, 74, 0.12));
  color: var(--text);
  font-weight: 600;
  cursor: pointer;
  border-left: 2px solid var(--accent);
}
.tt .tt-c.tt-conflict {
  background: rgba(176, 0, 32, 0.12);
  border-left-color: #b00020;
}
.tt .tt-c .room {
  display: block;
  font-weight: 400;
  font-size: 9px;
  color: var(--text3);
  margin-top: 1px;
}

/* ── Papers form (collapsible) ─────────────────────────────── */
.paper-form-details {
  border: 1px solid var(--border);
  border-radius: 12px;
  margin-bottom: 14px;
  overflow: hidden;
}
.paper-form-details > summary {
  list-style: none;
  cursor: pointer;
  padding: 12px 16px;
  font-size: 14px;
  font-weight: 700;
  color: var(--accent);
  -webkit-user-select: none;
  user-select: none;
}
.paper-form-details > summary::-webkit-details-marker { display: none; }
.paper-form-details[open] > summary { border-bottom: 1px solid var(--border); }
.paper-form-list { border: 0; border-radius: 0; margin-bottom: 0; }
.paper-form-details .study-actions { padding: 12px 16px; margin: 0; }
.paper-or {
  text-align: center;
  font-size: 11px;
  color: var(--text3);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  background: var(--bg);
  padding: 6px;
}
.paper-search { margin-bottom: 6px; }

/* ── Papers list ───────────────────────────────────────────── */
.paper-group h2 {
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text3);
  font-weight: 700;
  margin: 18px 0 8px;
}
.paper-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
}
.paper-row a {
  color: var(--text);
  text-decoration: none;
  font-weight: 600;
  font-size: 14px;
  display: block;
}
.paper-row a:hover { color: var(--accent); }
.paper-row .meta {
  font-size: 12px;
  color: var(--text3);
  margin-top: 2px;
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  align-items: center;
}
.paper-row .pill {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  background: var(--hover);
  padding: 2px 6px;
  border-radius: 4px;
  color: var(--text2);
}
.paper-row .pill.pdf {
  background: rgba(176, 0, 32, 0.12);
  color: #b00020;
}

/* ── File-drop zone ────────────────────────────────────────── */
.file-drop {
  border: 1px dashed var(--border);
  border-radius: 10px;
  padding: 18px;
  text-align: center;
  color: var(--text3);
  font-size: 13px;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
  margin: 0;
}
.file-drop:hover, .file-drop.drag {
  background: var(--hover);
  border-color: var(--accent);
  color: var(--text);
}
.file-drop input[type="file"] {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}
.file-drop strong { color: var(--accent); }
.file-chip {
  display: inline-flex;
  gap: 8px;
  align-items: center;
  margin-top: 8px;
  padding: 4px 10px;
  background: var(--hover);
  border-radius: 999px;
  font-size: 12px;
}
.file-chip button {
  background: transparent;
  border: 0;
  color: var(--text3);
  cursor: pointer;
  font-size: 14px;
  padding: 0;
}

/* ── Mobile tightening ─────────────────────────────────────── */
@media (max-width: 600px) {
  .study-page { padding: 20px 14px 60px; }
  .study-head h1 { font-size: 22px; }
  .study-row { grid-template-columns: 1fr 56px 92px 28px; gap: 6px; }
  .study-field { grid-template-columns: 1fr; gap: 4px; }
  .study-field > span { font-size: 12px; }
  .study-result .big { font-size: 36px; }
}