/* ═══════════════════════════════════════════════
   CAT 2027 — Akshit's Prep Engine
   Design: Streako / spreadsheet-tracker aesthetic
   Light, white-dominant, pastel week accents
═══════════════════════════════════════════════ */

:root {
  /* Base */
  --bg:      #f5f6fa;
  --sur:     #ffffff;
  --sur2:    #f0f1f7;
  --sur3:    #e8e9f2;
  --bdr:     #e2e3ee;
  --tx:      #1a1a2e;
  --tx2:     #4a4a6a;
  --mu:      #9a9ab8;

  /* Accent — indigo primary */
  --ac:      #5b5fc7;
  --ac2:     #4a4eb8;
  --acbg:    #eef0ff;
  --ac-light:#dde0ff;

  /* Semantic */
  --gr:      #2d9e6b;
  --grbg:    #e6f7f0;
  --am:      #d48a0a;
  --ambg:    #fff3d6;
  --re:      #d94040;
  --rebg:    #fde8e8;
  --pu:      #7c3aed;
  --pubg:    #f0ebff;

  /* Week pastel palette — matches the video */
  --w1:      #b8d4f0;   /* blue   */
  --w1bg:    #e8f2fb;
  --w1tx:    #2a5f8a;
  --w2:      #f0b8c8;   /* pink   */
  --w2bg:    #fde8ef;
  --w2tx:    #8a2a48;
  --w3:      #b8e0c8;   /* green  */
  --w3bg:    #e8f7ee;
  --w3tx:    #2a6a48;
  --w4:      #f0deb8;   /* yellow */
  --w4bg:    #fdf5e8;
  --w4tx:    #7a5a20;

  --r:   12px;
  --rsm:  8px;
  --nav-h: 64px;
}

/* Dark mode (🌙 toggle) */
[data-theme="dark"] {
  --bg:      #12121e;
  --sur:     #1c1c2e;
  --sur2:    #24243a;
  --sur3:    #2e2e46;
  --bdr:     #38385a;
  --tx:      #f0f0f8;
  --tx2:     #a0a0c0;
  --mu:      #606080;
  --ac:      #818cf8;
  --ac2:     #6366f1;
  --acbg:    rgba(91,95,199,.18);
  --ac-light:rgba(91,95,199,.25);
  --gr:      #4ade80;
  --grbg:    rgba(74,222,128,.12);
  --am:      #fbbf24;
  --ambg:    rgba(251,191,36,.12);
  --re:      #f87171;
  --rebg:    rgba(248,113,113,.12);
  --pu:      #a78bfa;
  --pubg:    rgba(167,139,250,.12);
  --w1bg:    rgba(184,212,240,.1); --w1tx:#7ab8e8; --w1:#5a9fd4;
  --w2bg:    rgba(240,184,200,.1); --w2tx:#e878a0; --w2:#d46080;
  --w3bg:    rgba(184,224,200,.1); --w3tx:#78d4a8; --w3:#50c090;
  --w4bg:    rgba(240,222,184,.1); --w4tx:#e8c060; --w4:#d4a840;
}
[data-theme="dark"] .topbar { background: rgba(18,18,30,.9); }
[data-theme="dark"] .nav    { background: rgba(18,18,30,.92); }

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; -webkit-tap-highlight-color: transparent; }
html { font-size: 15px; scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--tx);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Inter", system-ui, sans-serif;
  line-height: 1.6;
  min-height: 100dvh;
  padding-bottom: calc(var(--nav-h) + env(safe-area-inset-bottom, 0px) + 8px);
  padding-top: env(safe-area-inset-top, 0px);
  -webkit-font-smoothing: antialiased;
}
input, select, textarea, button { font: inherit; }
a { color: inherit; text-decoration: none; }
h1, h2, h3, h4 { margin: 0; line-height: 1.3; }
img, svg { display: block; }

/* ── Scrollbar ── */
::-webkit-scrollbar { width: 5px; height: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--bdr); border-radius: 99px; }

/* ── Layout ── */
.wrap  { max-width: 720px; margin: 0 auto; padding: 0 16px; }
.stack { display: flex; flex-direction: column; gap: 12px; }
.row   { display: flex; align-items: center; gap: 8px; }
.row.sp { justify-content: space-between; }
.row > * { min-width: 0; }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.grid3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
@media (max-width: 420px) { .grid2 { grid-template-columns: 1fr; } .grid3 { grid-template-columns: repeat(2,1fr); } }

/* ── Topbar ── */
.topbar {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(16px) saturate(160%);
  -webkit-backdrop-filter: blur(16px) saturate(160%);
  border-bottom: 2px solid var(--bdr);
  padding: 10px 16px;
  display: flex; align-items: center; justify-content: space-between; gap: 10px;
}
.tb-brand .ttl {
  font-size: 16px; font-weight: 800; letter-spacing: -.02em;
  color: var(--ac);
}
.tb-brand .sub { font-size: 11px; color: var(--mu); margin-top: 1px; font-weight: 500; }
.tb-acts { display: flex; gap: 6px; align-items: center; }

/* ── Cards ── */
.card {
  background: var(--sur);
  border: 1.5px solid var(--bdr);
  border-radius: var(--r);
  padding: 16px;
  position: relative;
  overflow: hidden;
}
.card-sm  { padding: 12px 14px; }
.card-xs  { padding: 9px 12px; }
.card-in  { background: var(--sur2); border: 1.5px solid var(--bdr); border-radius: var(--rsm); padding: 11px 13px; }
.card-in + .card-in { margin-top: 6px; }

/* Hero gradient card (used on syllabus/errors protocol cards) */
.hero-grad { background: linear-gradient(135deg, var(--acbg) 0%, var(--sur) 100%); border-color: rgba(129,140,248,.25); }

/* Pastel week header cards */
.week-card { border-radius: var(--rsm); padding: 6px 10px; font-weight: 700; font-size: 12px; text-align: center; }
.wk1 { background: var(--w1bg); color: var(--w1tx); border: 1.5px solid var(--w1); }
.wk2 { background: var(--w2bg); color: var(--w2tx); border: 1.5px solid var(--w2); }
.wk3 { background: var(--w3bg); color: var(--w3tx); border: 1.5px solid var(--w3); }
.wk4 { background: var(--w4bg); color: var(--w4tx); border: 1.5px solid var(--w4); }

/* ── Inputs ── */
input, select, textarea {
  background: var(--sur2); color: var(--tx);
  border: 1.5px solid var(--bdr); border-radius: var(--rsm);
  padding: 9px 12px; font-size: 14px; outline: none;
  transition: border-color .15s, box-shadow .15s;
}
input:focus, select:focus, textarea:focus {
  border-color: var(--ac);
  box-shadow: 0 0 0 3px rgba(91,95,199,.15);
}
textarea { display: block; width: 100%; resize: vertical; min-height: 80px; }
.field { display: flex; flex-direction: column; gap: 5px; }
.field > label { font-size: 11.5px; color: var(--mu); font-weight: 700; text-transform: uppercase; letter-spacing: .05em; }
.field input, .field select, .field textarea { display: block; width: 100%; }
input[type=number] { -moz-appearance: textfield; }
input[type=number]::-webkit-inner-spin-button,
input[type=number]::-webkit-outer-spin-button { opacity: 1; }

/* ── Checkbox (spreadsheet style) ── */
.chk-cell {
  width: 26px; height: 26px; border: 2px solid var(--bdr);
  border-radius: 5px; background: var(--sur); cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: all .12s; flex-shrink: 0;
}
.chk-cell:hover { border-color: var(--ac); background: var(--acbg); }
.chk-cell.checked { background: var(--ac); border-color: var(--ac); }
.chk-cell.checked::after { content: '✓'; color: #fff; font-size: 13px; font-weight: 800; }
.chk-cell.partial { background: var(--ambg); border-color: var(--am); }
.chk-cell.partial::after { content: '◑'; color: var(--am); font-size: 12px; }
.chk-cell.missed  { background: var(--rebg); border-color: var(--re); }
.chk-cell.missed::after  { content: '✕'; color: var(--re); font-size: 11px; font-weight: 700; }

/* ── Spreadsheet grid ── */
.sheet-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; }
.sheet { border-collapse: collapse; width: 100%; min-width: 520px; font-size: 13px; }
.sheet th {
  font-weight: 700; font-size: 11px; text-transform: uppercase; letter-spacing: .04em;
  padding: 8px 10px; text-align: center; border: 1.5px solid var(--bdr);
  background: var(--sur2); color: var(--mu); white-space: nowrap;
}
.sheet th.task-col { text-align: left; min-width: 160px; }
.sheet th.wk1h { background: var(--w1bg); color: var(--w1tx); border-color: var(--w1); }
.sheet th.wk2h { background: var(--w2bg); color: var(--w2tx); border-color: var(--w2); }
.sheet th.wk3h { background: var(--w3bg); color: var(--w3tx); border-color: var(--w3); }
.sheet th.wk4h { background: var(--w4bg); color: var(--w4tx); border-color: var(--w4); }
.sheet td {
  padding: 7px 8px; border: 1px solid var(--bdr);
  vertical-align: middle; text-align: center;
  transition: background .1s;
}
.sheet td.task-name { text-align: left; font-weight: 500; font-size: 13px; padding-left: 12px; }
.sheet tr:hover td  { background: var(--sur2); }
.sheet tr.row-num td:first-child { color: var(--mu); font-size: 11px; font-weight: 700; width: 28px; }

/* ── Buttons ── */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  padding: 8px 16px; border: 1.5px solid var(--bdr); border-radius: var(--rsm);
  background: var(--sur); color: var(--tx); font-size: 13px; font-weight: 600;
  cursor: pointer; white-space: nowrap;
  transition: background .12s, border-color .12s, transform .08s;
}
.btn:hover  { background: var(--sur2); border-color: var(--mu); }
.btn:active { transform: scale(.97); }
.btn.xs { padding: 4px 10px; font-size: 12px; border-radius: 6px; }
.btn.sm { padding: 6px 13px; font-size: 12.5px; }
.btn.lg { padding: 11px 22px; font-size: 14px; border-radius: var(--r); }
.btn.full { width: 100%; }
.btn.ac  { background: var(--ac); color: #fff; border-color: var(--ac); box-shadow: 0 2px 10px rgba(91,95,199,.25); }
.btn.ac:hover  { background: var(--ac2); }
.btn.gr  { background: var(--gr); color: #fff; border-color: var(--gr); }
.btn.re  { background: var(--re); color: #fff; border-color: var(--re); }
.btn.am  { background: var(--am); color: #fff; border-color: var(--am); }
.btn.pu  { background: var(--pu); color: #fff; border-color: var(--pu); }
.btn.ghost { background: transparent; border-color: transparent; color: var(--mu); padding: 6px 9px; }
.btn.ghost:hover { background: var(--sur2); color: var(--tx); border-color: var(--bdr); }
.btn.icon-btn { width: 34px; height: 34px; padding: 0; border-radius: 9px; font-size: 16px; }

/* ── Badges ── */
.badge { display: inline-flex; align-items: center; gap: 3px; font-size: 11px; font-weight: 700; padding: 2px 8px; border-radius: 999px; border: 1.5px solid var(--bdr); background: var(--sur2); color: var(--mu); }
.badge.ac { background: var(--acbg); color: var(--ac); border-color: var(--ac); }
.badge.gr { background: var(--grbg); color: var(--gr); border-color: var(--gr); }
.badge.am { background: var(--ambg); color: var(--am); border-color: var(--am); }
.badge.re { background: var(--rebg); color: var(--re); border-color: var(--re); }
.badge.pu { background: var(--pubg); color: var(--pu); border-color: var(--pu); }

/* ── Progress bar ── */
.pbar   { height: 7px; background: var(--sur3); border-radius: 99px; overflow: hidden; }
.pbar-f { height: 100%; border-radius: 99px; background: var(--ac); transition: width .4s ease; }
.pbar-f.gr  { background: var(--gr); }
.pbar-f.am  { background: var(--am); }
.pbar-f.re  { background: var(--re); }

/* ── Donut ring (streako style) ── */
.ring-w   { position: relative; flex-shrink: 0; }
.ring-svg { display: block; }
.ring-bg  { fill: none; stroke: var(--sur3); stroke-width: 8; }
.ring-fg  { fill: none; stroke-linecap: round; transition: stroke-dasharray .6s ease; }
.ring-lbl { position: absolute; inset: 0; display: flex; flex-direction: column; align-items: center; justify-content: center; }
.ring-pct { font-weight: 900; letter-spacing: -.02em; line-height: 1; }
.ring-sub { font-size: 10px; color: var(--mu); font-weight: 600; margin-top: 2px; }

/* ── Stat box (top summary) ── */
.stat-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 8px; }
@media (min-width: 480px) { .stat-grid { grid-template-columns: repeat(auto-fit, minmax(110px,1fr)); } }
.stat { background: var(--sur); border: 1.5px solid var(--bdr); border-radius: var(--rsm); padding: 12px 10px; text-align: center; }
.stat .v { font-size: 22px; font-weight: 900; display: block; line-height: 1.1; color: var(--ac); }
.stat .l { font-size: 10.5px; color: var(--mu); display: block; margin-top: 3px; font-weight: 600; text-transform: uppercase; letter-spacing: .04em; }

/* ── Section header ── */
.sh { display: flex; align-items: center; justify-content: space-between; margin: 20px 0 10px; flex-wrap: wrap; gap: 6px; }
.sh h2 { font-size: 11px; font-weight: 800; text-transform: uppercase; letter-spacing: .08em; color: var(--mu); }

/* ── Week strip ── */
.wstrip { display: grid; grid-template-columns: repeat(7,1fr); gap: 4px; margin-top: 12px; }
.wd { text-align: center; padding: 5px 2px; border-radius: 8px; border: 1.5px solid transparent; background: var(--sur2); cursor: pointer; transition: all .12s; }
.wd .wn { font-size: 9px; color: var(--mu); text-transform: uppercase; font-weight: 700; }
.wd .wi { font-size: 14px; margin-top: 2px; }
.wd.cur { border-color: var(--ac); background: var(--acbg); }
.wd.ok  { background: var(--grbg); border-color: var(--gr); }
.wd.nz  { background: var(--ambg); border-color: var(--am); }
.wd.no  { background: var(--rebg); border-color: var(--re); }

/* ── Calendar ── */
.calgrid { display: grid; grid-template-columns: repeat(7,1fr); gap: 4px; }
.calhdr  { font-size: 10px; color: var(--mu); text-align: center; padding: 4px 0; font-weight: 800; letter-spacing: .04em; text-transform: uppercase; }
.calday  { aspect-ratio: 1; display: flex; align-items: center; justify-content: center; border: 1.5px solid var(--bdr); border-radius: 6px; font-size: 12px; background: var(--sur2); cursor: pointer; transition: all .12s; font-weight: 500; }
.calday.good  { background: var(--grbg); border-color: var(--gr); color: var(--gr); font-weight: 700; }
.calday.warn  { background: var(--ambg); border-color: var(--am); color: var(--am); font-weight: 700; }
.calday.bad   { background: var(--rebg); border-color: var(--re); color: var(--re); font-weight: 700; }
.calday.today { outline: 2.5px solid var(--ac); outline-offset: 1px; font-weight: 900; }
.calday.empty { background: transparent; border-color: transparent; cursor: default; }

/* ── Task row (spreadsheet row style) ── */
.task-row { display: flex; align-items: center; gap: 10px; padding: 9px 12px; border-bottom: 1px solid var(--bdr); background: var(--sur); }
.task-row:last-child { border-bottom: none; }
.task-row:hover { background: var(--sur2); }
.task-row .row-n { width: 22px; font-size: 11px; color: var(--mu); font-weight: 700; flex-shrink: 0; text-align: right; }
.task-row .task-label { flex: 1; font-size: 13.5px; font-weight: 500; }
.task-row .task-tag { font-size: 11px; font-weight: 700; padding: 2px 8px; border-radius: 999px; flex-shrink: 0; }

/* ── Stepper ── */
.stepper { display: flex; align-items: center; gap: 5px; }
.stepper input { width: 54px !important; text-align: center; padding: 6px 4px; flex-shrink: 0; }

/* ── Error card ── */
.errc { background: var(--sur); border: 1.5px solid var(--bdr); border-radius: var(--r); padding: 14px 16px; border-left: 4px solid var(--bdr); }
.errc.cc { border-left-color: var(--ac); }
.errc.cr { border-left-color: var(--am); }
.errc.cs { border-left-color: var(--re); }
.errc.resolved { opacity: .45; }

/* ── Top-10 leaderboard (mocks page) ── */
.leaderboard { border-collapse: collapse; width: 100%; font-size: 13px; }
.leaderboard th { font-weight: 800; font-size: 10.5px; text-transform: uppercase; letter-spacing: .05em; padding: 9px 12px; background: var(--sur2); border-bottom: 2px solid var(--bdr); color: var(--mu); text-align: left; }
.leaderboard td { padding: 9px 12px; border-bottom: 1px solid var(--bdr); }
.leaderboard tr:last-child td { border-bottom: none; }
.leaderboard tr:hover td { background: var(--sur2); }
.leaderboard .rank { width: 28px; font-weight: 900; color: var(--mu); font-size: 12px; }
.leaderboard .pct-bar { display: flex; align-items: center; gap: 8px; }
.leaderboard .pct-fill { height: 6px; border-radius: 99px; background: var(--ac); flex-shrink: 0; transition: width .4s; }

/* ── SVG bar chart (pastel bars) ── */
.chartwrap { width: 100%; overflow-x: hidden; }
.chartwrap svg { width: 100%; height: auto; display: block; }

/* ── Bottom nav ── */
.nav {
  position: fixed; left: 0; right: 0; bottom: 0;
  height: var(--nav-h);
  padding-bottom: env(safe-area-inset-bottom, 0px);
  background: rgba(255,255,255,.94);
  backdrop-filter: blur(16px) saturate(160%);
  -webkit-backdrop-filter: blur(16px) saturate(160%);
  border-top: 2px solid var(--bdr);
  display: flex; z-index: 100;
}
.nbtn {
  flex: 1; border: 0; background: none; color: var(--mu);
  padding: 4px 1px 6px; display: flex; flex-direction: column;
  align-items: center; justify-content: center; gap: 1px;
  font-size: 9px; font-weight: 700; cursor: pointer;
  transition: color .15s; overflow: hidden; position: relative;
  text-transform: uppercase; letter-spacing: .02em;
}
.nbtn .ni { font-size: 18px; line-height: 1; transition: transform .15s; }
.nbtn.on  { color: var(--ac); }
.nbtn.on .ni { transform: translateY(-1px); }
.nbtn.on::after {
  content: ''; position: absolute; bottom: calc(env(safe-area-inset-bottom,0px) + 3px);
  left: 50%; transform: translateX(-50%);
  width: 22px; height: 3px; background: var(--ac); border-radius: 99px;
}
@media (max-width: 360px) { .nbtn span { font-size: 0; } .nbtn .ni { font-size: 22px; } }

/* ── Modal ── */
.mbg { position: fixed; inset: 0; background: rgba(0,0,0,.45); backdrop-filter: blur(4px); z-index: 200; display: flex; align-items: flex-end; justify-content: center; padding: 10px; animation: fadeIn .15s ease; }
@media (min-width: 500px) { .mbg { align-items: center; } }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
.modal { background: var(--sur); border: 1.5px solid var(--bdr); border-radius: 16px 16px var(--r) var(--r); width: 100%; max-width: 480px; max-height: 92vh; overflow-y: auto; padding: 20px; box-shadow: 0 16px 60px rgba(0,0,0,.15); animation: slideUp .18s ease; }
@media (min-width: 500px) { .modal { border-radius: var(--r); } }
@keyframes slideUp { from { transform: translateY(24px); opacity: 0; } to { transform: translateY(0); opacity: 1; } }
.mhdr { display: flex; align-items: center; justify-content: space-between; margin-bottom: 16px; }
.mhdr h3 { font-size: 16px; font-weight: 800; }

/* ── Timer ── */
.tdisp { font-size: 54px; font-weight: 900; letter-spacing: 3px; font-variant-numeric: tabular-nums; color: var(--ac); text-align: center; line-height: 1; }

/* ── Table ── */
.tblw { overflow-x: auto; -webkit-overflow-scrolling: touch; }
table  { border-collapse: collapse; width: 100%; font-size: 13px; }
th     { font-weight: 700; color: var(--mu); font-size: 10.5px; text-transform: uppercase; letter-spacing: .05em; text-align: left; padding: 8px 10px; border-bottom: 2px solid var(--bdr); background: var(--sur2); }
td     { padding: 8px 10px; border-bottom: 1px solid var(--bdr); vertical-align: top; }
tr:last-child td { border-bottom: none; }
tr:hover td { background: var(--sur2); }

/* ── Accordion ── */
details { border: 1.5px solid var(--bdr); border-radius: var(--rsm); background: var(--sur); overflow: hidden; }
details + details { margin-top: 6px; }
summary { padding: 12px 14px; font-weight: 700; font-size: 13px; cursor: pointer; list-style: none; display: flex; justify-content: space-between; align-items: center; user-select: none; }
summary::-webkit-details-marker { display: none; }
summary::after { content: "›"; font-size: 18px; color: var(--mu); transition: transform .2s; }
details[open] summary::after { transform: rotate(90deg); }
.db { padding: 0 14px 14px; }

/* ── Sync dot ── */
.sync-dot { width: 8px; height: 8px; border-radius: 50%; display: inline-block; }
.sync-dot.ok   { background: var(--gr); }
.sync-dot.busy { background: var(--am); animation: pulse 1s infinite; }
.sync-dot.err  { background: var(--re); }
@keyframes pulse { 0%,100%{opacity:1} 50%{opacity:.3} }

/* ── Misc ── */
.mu   { color: var(--mu); }
.tx2  { color: var(--tx2); }
.tsm  { font-size: 13px; }
.txs  { font-size: 12px; }
.fb   { font-weight: 700; }
.f8   { font-weight: 800; }
.empty { color: var(--mu); font-size: 13px; text-align: center; padding: 32px 0; }
.pill  { display: flex; gap: 5px; flex-wrap: wrap; }
.sep   { border: none; border-top: 1.5px solid var(--bdr); margin: 14px 0; }
.txt-ac { color: var(--ac); } .txt-gr { color: var(--gr); } .txt-am { color: var(--am); } .txt-re { color: var(--re); }

/* ── Responsive ── */
@media (max-width: 479px) {
  td, th { padding: 6px 7px; font-size: 12px; }
  .tdisp { font-size: 44px; }
  .stat .v { font-size: 18px; }
}