/* ==========================================================================
   AI Studio v2 — Design System  (WHITE + GREEN ONLY)
   InternshipADDA Course Generator
   ========================================================================== */

:root {
  --green:        #16a34a;
  --green-600:    #12833c;
  --green-700:    #0f6e33;
  --green-800:    #0b5227;
  --green-050:    #f0fdf4;
  --green-100:    #dcfce7;
  --green-150:    #cbf4d6;
  --green-200:    #bbf7d0;
  --tint:         #f6fdf9;
  --border:       #d7f0e0;
  --border-soft:  #e6f6ec;
  --white:        #ffffff;
  --ink:          #0f2a1a;   /* near-black green for text */
  --ink-soft:     #35564321; /* unused fallback */
  --muted:        #5f7a6b;   /* muted green-gray */
  --muted-2:      #86a394;
  --shadow:       0 1px 2px rgba(15,42,26,.06), 0 8px 24px rgba(15,42,26,.06);
  --shadow-lg:    0 12px 40px rgba(15,42,26,.12);
  --radius:       14px;
  --radius-sm:    10px;
}

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

html, body { height: 100%; }

body {
  background:
    radial-gradient(1200px 500px at 100% -10%, var(--green-050), transparent 60%),
    radial-gradient(900px 500px at -10% 110%, var(--green-050), transparent 55%),
    var(--white);
  color: var(--ink);
  font-family: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
  font-size: 15px;
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--green-600); text-decoration: none; }
a:hover { color: var(--green-800); }

/* ---------- Layout ---------- */
.shell { max-width: 1180px; padding: 28px clamp(18px, 3vw, 40px) 64px; }
.sidebar ~ .shell { margin-left: var(--sidebar-w); }
.center-wrap { min-height: 100vh; display: flex; align-items: center; justify-content: center; padding: 22px; }

/* ---------- Brand (used on login screen) ---------- */
.brand { display: flex; align-items: center; gap: 11px; font-weight: 800; font-size: 18px; color: var(--ink); letter-spacing: -.3px; }
.brand .logo {
  width: 38px; height: 38px; border-radius: 11px;
  background: linear-gradient(135deg, var(--green), var(--green-700));
  color: #fff; display: grid; place-items: center; font-size: 20px;
  box-shadow: 0 6px 16px rgba(22,163,74,.35);
}
.brand small { display: block; font-size: 11px; font-weight: 600; color: var(--muted); letter-spacing: .2px; }

/* ---------- Sidebar (left navigation) ---------- */
:root { --sidebar-w: 250px; }
.sidebar {
  position: fixed; top: 0; left: 0; z-index: 60;
  width: var(--sidebar-w); height: 100vh;
  background: var(--white); border-right: 1px solid var(--border);
  display: flex; flex-direction: column; padding: 22px 16px;
  transition: transform .25s ease;
}
.side-brand { display: flex; align-items: center; gap: 11px; font-weight: 800; font-size: 18px; color: var(--ink); letter-spacing: -.3px; padding: 2px 6px 0; margin-bottom: 24px; }
.side-brand .logo {
  width: 40px; height: 40px; border-radius: 11px; flex: 0 0 auto;
  background: linear-gradient(135deg, var(--green), var(--green-700));
  color: #fff; display: grid; place-items: center; font-size: 21px;
  box-shadow: 0 6px 16px rgba(22,163,74,.35);
}
.side-brand small { display: block; font-size: 11px; font-weight: 600; color: var(--muted); letter-spacing: .2px; }
.side-nav { display: flex; flex-direction: column; gap: 4px; flex: 1; overflow-y: auto; }
.side-link { display: flex; align-items: center; gap: 12px; padding: 11px 13px; border-radius: 10px; font-weight: 600; font-size: 14.5px; color: var(--muted); transition: .15s; }
.side-link:hover { background: var(--green-050); color: var(--green-800); }
.side-link.active { background: var(--green-100); color: var(--green-800); }
.side-link .i { font-size: 17px; width: 22px; text-align: center; flex: 0 0 auto; }
.side-foot { border-top: 1px solid var(--border); padding-top: 14px; margin-top: 10px; }
.side-user { display: flex; align-items: center; gap: 10px; margin-bottom: 10px; padding: 0 4px; }
.side-user .nm { font-size: 13.5px; font-weight: 700; color: var(--ink); line-height: 1.2; }
.side-user .rl { font-size: 11.5px; color: var(--muted); }
.side-logout { display: flex; align-items: center; gap: 10px; padding: 10px 13px; border-radius: 10px; font-weight: 600; font-size: 14px; color: var(--green-800); }
.side-logout:hover { background: var(--green-050); }
.avatar { width: 36px; height: 36px; border-radius: 50%; background: var(--green-100); color: var(--green-800); display: grid; place-items: center; font-weight: 800; font-size: 14px; flex: 0 0 auto; }

/* ---------- Mobile top bar + overlay ---------- */
.mtop { display: none; position: fixed; top: 0; left: 0; right: 0; z-index: 55; height: 60px; align-items: center; gap: 12px; padding: 0 14px; background: rgba(255,255,255,.92); backdrop-filter: blur(10px); border-bottom: 1px solid var(--border); }
.burger { width: 42px; height: 42px; border-radius: 10px; border: 1px solid var(--border); background: #fff; display: grid; place-items: center; cursor: pointer; color: var(--green-800); }
.burger span, .burger span::before, .burger span::after { display: block; width: 18px; height: 2px; background: currentColor; border-radius: 2px; }
.burger span { position: relative; }
.burger span::before { content: ''; position: absolute; top: -6px; }
.burger span::after { content: ''; position: absolute; top: 6px; }
.m-brand { display: flex; align-items: center; gap: 9px; font-weight: 800; color: var(--ink); font-size: 16px; }
.m-brand .logo { width: 30px; height: 30px; border-radius: 8px; background: linear-gradient(135deg, var(--green), var(--green-700)); color: #fff; display: grid; place-items: center; font-size: 16px; }
.overlay { display: none; position: fixed; inset: 0; background: rgba(15,42,26,.4); z-index: 59; }
.overlay.show { display: block; }

/* ---------- Cards ---------- */
.card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.card-pad { padding: 24px; }
.card-tint { background: var(--tint); }

/* ---------- Headings ---------- */
.h1 { font-size: 26px; font-weight: 800; letter-spacing: -.5px; color: var(--ink); }
.h2 { font-size: 20px; font-weight: 800; letter-spacing: -.3px; color: var(--ink); }
.h3 { font-size: 16px; font-weight: 700; color: var(--ink); }
.sub { color: var(--muted); font-size: 14px; }
.eyebrow { text-transform: uppercase; letter-spacing: .14em; font-size: 11px; font-weight: 800; color: var(--green-600); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  border: 1px solid transparent; border-radius: var(--radius-sm);
  padding: 12px 20px; font-size: 15px; font-weight: 700; cursor: pointer;
  transition: .16s; text-decoration: none; line-height: 1;
}
.btn:disabled { opacity: .55; cursor: not-allowed; }
.btn-primary { background: var(--green); color: #fff; box-shadow: 0 6px 16px rgba(22,163,74,.28); }
.btn-primary:hover:not(:disabled) { background: var(--green-600); color:#fff; transform: translateY(-1px); }
.btn-ghost { background: var(--white); color: var(--green-800); border-color: var(--border); }
.btn-ghost:hover:not(:disabled) { background: var(--green-050); }
.btn-soft { background: var(--green-100); color: var(--green-800); }
.btn-soft:hover:not(:disabled) { background: var(--green-150); }
.btn-block { width: 100%; }
.btn-sm { padding: 8px 13px; font-size: 13px; border-radius: 9px; }
.btn-lg { padding: 15px 26px; font-size: 16px; }
.btn-danger { background: var(--white); color: var(--green-800); border-color: var(--border); }
.btn-danger:hover:not(:disabled) { background: var(--green-050); border-color: var(--green-200); }

/* ---------- Forms ---------- */
.field { margin-bottom: 18px; }
.label { display: block; font-size: 13px; font-weight: 700; color: var(--green-800); margin-bottom: 8px; }
.hint { font-size: 12px; color: var(--muted); margin-top: 6px; }
.input, .select, .textarea {
  width: 100%; background: var(--white); color: var(--ink);
  border: 1px solid var(--border); border-radius: var(--radius-sm);
  padding: 12px 14px; font-size: 15px; font-family: inherit; outline: none; transition: .15s;
}
.input:focus, .select:focus, .textarea:focus { border-color: var(--green); box-shadow: 0 0 0 4px rgba(22,163,74,.12); }
.input::placeholder, .textarea::placeholder { color: var(--muted-2); }
.textarea { resize: vertical; min-height: 96px; }
.select { appearance: none; background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%2316a34a' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E"); background-repeat: no-repeat; background-position: right 12px center; padding-right: 38px; cursor: pointer; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
@media (max-width: 640px) { .grid-2, .grid-3 { grid-template-columns: 1fr; } }

/* split layouts (building / preview pages) */
.split { display: grid; gap: 16px; align-items: start; }
.split-build { grid-template-columns: 1.35fr .9fr; }
.split-preview { grid-template-columns: .8fr 1.6fr; }
.pv-side { position: sticky; top: 20px; }

/* ---------- Choice tiles (radio-cards) ---------- */
.tiles { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.tile {
  border: 1.5px solid var(--border); border-radius: var(--radius-sm);
  padding: 16px; cursor: pointer; transition: .15s; background: var(--white);
}
.tile:hover { border-color: var(--green-200); background: var(--green-050); }
.tile.selected { border-color: var(--green); background: var(--green-050); box-shadow: 0 0 0 3px rgba(22,163,74,.12); }
.tile .t-icon { font-size: 22px; }
.tile .t-title { font-weight: 800; margin-top: 6px; color: var(--ink); }
.tile .t-desc { font-size: 12.5px; color: var(--muted); margin-top: 2px; }

/* ---------- Badges / pills ---------- */
.badge {
  display: inline-flex; align-items: center; gap: 5px;
  padding: 4px 10px; border-radius: 999px; font-size: 12px; font-weight: 700;
  background: var(--green-100); color: var(--green-800); border: 1px solid var(--border);
}
.badge.outline { background: var(--white); }
.badge.dot::before { content: ''; width: 7px; height: 7px; border-radius: 50%; background: var(--green); }
.badge.muted { background: var(--tint); color: var(--muted); }
.badge.pulse::before { content:''; width:7px;height:7px;border-radius:50%;background:var(--green); animation: pulse 1.2s infinite; }
@keyframes pulse { 0%,100%{opacity:1} 50%{opacity:.25} }

/* ---------- Stats ---------- */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
@media (max-width: 720px) { .stats { grid-template-columns: 1fr 1fr; } }
.stat { background: var(--white); border: 1px solid var(--border); border-radius: var(--radius); padding: 18px 18px; box-shadow: var(--shadow); }
.stat .k { font-size: 30px; font-weight: 800; color: var(--green-700); line-height: 1; }
.stat .l { font-size: 13px; color: var(--muted); margin-top: 8px; font-weight: 600; }
.stat .ic { float: right; font-size: 22px; opacity: .5; }

/* ---------- Table ---------- */
.table-wrap { overflow-x: auto; border: 1px solid var(--border); border-radius: var(--radius); background: var(--white); }
table.tbl { width: 100%; border-collapse: collapse; font-size: 14px; }
.tbl th { text-align: left; padding: 13px 16px; background: var(--tint); color: var(--muted); font-weight: 700; font-size: 12px; text-transform: uppercase; letter-spacing: .05em; border-bottom: 1px solid var(--border); white-space: nowrap; }
.tbl td { padding: 13px 16px; border-bottom: 1px solid var(--border-soft); vertical-align: middle; }
.tbl tr:last-child td { border-bottom: none; }
.tbl tr:hover td { background: var(--green-050); }

/* status chips */
.chip { display:inline-flex; align-items:center; gap:5px; padding:3px 9px; border-radius:999px; font-size:11.5px; font-weight:800; border:1px solid var(--border); }
.chip-saved { background: var(--green-100); color: var(--green-800); }
.chip-gen   { background: var(--tint); color: var(--green-700); }
.chip-fail  { background: #fff; color: var(--muted); border-style: dashed; }

/* ---------- Progress ---------- */
.progress { height: 12px; background: var(--green-100); border-radius: 999px; overflow: hidden; border: 1px solid var(--border); }
.progress > i { display: block; height: 100%; width: 0%; background: linear-gradient(90deg, var(--green), var(--green-700)); border-radius: 999px; transition: width .4s ease; }
.ring { --p: 0; width: 120px; height: 120px; border-radius: 50%; display: grid; place-items: center;
  background: conic-gradient(var(--green) calc(var(--p)*1%), var(--green-100) 0); }
.ring > span { width: 92px; height: 92px; border-radius: 50%; background: #fff; display: grid; place-items: center; font-weight: 800; font-size: 22px; color: var(--green-700); }

/* ---------- Alerts ---------- */
.alert { border-radius: var(--radius-sm); padding: 12px 15px; font-size: 13.5px; font-weight: 600; display: none; }
.alert.show { display: block; }
.alert-err { background: var(--tint); border: 1px solid var(--border); color: var(--ink); }
.alert-ok  { background: var(--green-050); border: 1px solid var(--green-200); color: var(--green-800); }

/* ---------- Log feed (building page) ---------- */
.log { font-family: 'SF Mono', ui-monospace, Menlo, Consolas, monospace; font-size: 12.5px; background: var(--tint); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 12px 14px; max-height: 240px; overflow-y: auto; }
.log-line { padding: 2px 0; color: var(--muted); white-space: pre-wrap; word-break: break-word; }
.log-line b { color: var(--green-700); }
.log-line.err { color: #4a5b52; font-style: italic; }
.log-line.ok { color: var(--green-700); }

/* ---------- Live chapter list ---------- */
.chap { border: 1px solid var(--border); border-radius: var(--radius-sm); background: var(--white); margin-bottom: 8px; overflow: hidden; }
.chap-head { display: flex; align-items: center; gap: 10px; padding: 11px 14px; cursor: pointer; }
.chap-head:hover { background: var(--green-050); }
.chap-num { width: 30px; height: 30px; border-radius: 8px; background: var(--green-100); color: var(--green-800); display: grid; place-items: center; font-weight: 800; font-size: 13px; flex: 0 0 auto; }
.chap-title { font-weight: 700; font-size: 14px; color: var(--ink); flex: 1; }
.chap-body { padding: 4px 16px 18px 16px; border-top: 1px solid var(--border-soft); display: none; }
.chap.open .chap-body { display: block; }

/* ---------- Rich content (course HTML) ---------- */
.content-html { color: #1c2b22; font-size: 15px; line-height: 1.75; }
.content-html h1, .content-html h2, .content-html h3, .content-html h4 { color: var(--green-800); margin: 18px 0 8px; line-height: 1.3; }
.content-html h2 { font-size: 21px; } .content-html h3 { font-size: 18px; } .content-html h4 { font-size: 16px; }
.content-html p { margin: 10px 0; }
.content-html ul, .content-html ol { margin: 10px 0 10px 22px; }
.content-html li { margin: 5px 0; }
.content-html code { background: var(--green-050); border: 1px solid var(--border); border-radius: 6px; padding: 1px 6px; font-family: ui-monospace, Menlo, Consolas, monospace; font-size: 13.5px; color: var(--green-800); }
.content-html pre { background: #0b3d22; color: #eafff0; border-radius: 12px; padding: 16px 18px; overflow-x: auto; margin: 14px 0; border: 1px solid var(--green-800); }
.content-html pre code { background: none; border: none; color: inherit; padding: 0; font-size: 13.5px; }
.content-html table { width: 100%; border-collapse: collapse; margin: 14px 0; }
.content-html th, .content-html td { border: 1px solid var(--border); padding: 9px 12px; text-align: left; }
.content-html th { background: var(--green-050); color: var(--green-800); }
.content-html blockquote { border-left: 4px solid var(--green); background: var(--green-050); padding: 10px 16px; margin: 14px 0; border-radius: 0 8px 8px 0; color: var(--green-800); }
.content-html a { color: var(--green-600); text-decoration: underline; }
.content-html img { max-width: 100%; border-radius: 10px; }

/* ---------- Quiz ---------- */
.quiz { border: 1px solid var(--border); border-radius: var(--radius-sm); background: var(--green-050); padding: 16px; margin-top: 14px; }
.quiz .q { font-weight: 700; margin-bottom: 10px; color: var(--ink); }
.quiz .opt { display: flex; gap: 10px; align-items: flex-start; padding: 9px 12px; border: 1px solid var(--border); border-radius: 9px; background: #fff; margin-bottom: 7px; cursor: pointer; transition: .12s; }
.quiz .opt:hover { border-color: var(--green-200); }
.quiz .opt.correct { border-color: var(--green); background: var(--green-100); }
.quiz .opt .mk { font-weight: 800; color: var(--green-700); }

/* ---------- Misc ---------- */
.spinner { width: 18px; height: 18px; border: 2.5px solid rgba(255,255,255,.45); border-top-color: #fff; border-radius: 50%; animation: spin .7s linear infinite; display: inline-block; }
.spinner.green { border-color: var(--green-100); border-top-color: var(--green); }
@keyframes spin { to { transform: rotate(360deg); } }
.row { display: flex; align-items: center; gap: 10px; }
.between { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.wrap-gap { display: flex; flex-wrap: wrap; gap: 10px; }
.mt-8{margin-top:8px}.mt-12{margin-top:12px}.mt-16{margin-top:16px}.mt-20{margin-top:20px}.mt-24{margin-top:24px}
.mb-8{margin-bottom:8px}.mb-12{margin-bottom:12px}.mb-16{margin-bottom:16px}.mb-20{margin-bottom:20px}.mb-24{margin-bottom:24px}
.muted { color: var(--muted); }
.hidden { display: none !important; }
.text-c { text-align: center; }
.divider { height: 1px; background: var(--border); margin: 18px 0; border: none; }

/* ==========================================================================
   Responsive breakpoints (full mobile friendly)
   ========================================================================== */
@media (max-width: 1080px) {
  .stats { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 900px) {
  .mtop { display: flex; }
  .sidebar { transform: translateX(-100%); width: 272px; box-shadow: var(--shadow-lg); }
  .sidebar.open { transform: translateX(0); }
  .sidebar ~ .shell { margin-left: 0; padding-top: 78px; }
  .split-build, .split-preview { grid-template-columns: 1fr; }
  .pv-side { position: static; }
}
@media (max-width: 640px) {
  .h1 { font-size: 22px; }
  .h2 { font-size: 18px; }
  .between { flex-wrap: wrap; }
  .card-pad { padding: 18px; }
  .btn-lg { padding: 13px 18px; font-size: 15px; }
  .stat .k { font-size: 24px; }
  .stats { grid-template-columns: 1fr 1fr; gap: 10px; }
}
@media (max-width: 430px) {
  .stats, .tiles { grid-template-columns: 1fr; }
}