:root {
  --ink: #0e0b1a;
  --ink-2: #171233;
  --panel: #1e1840;
  --panel-2: #241d4d;
  --line: #342b66;
  --lime: #c6f43a;
  --lime-ink: #16210a;
  --coral: #ff5d5d;
  --violet: #a78bfa;
  --cyan: #38e1d6;
  --text: #ede9ff;
  --muted: #a49dcf;
  --radius: 16px;
  --shadow: 0 18px 50px -20px rgba(0,0,0,.7);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: "Segoe UI", "Noto Sans TC", system-ui, -apple-system, sans-serif;
  background:
    radial-gradient(900px 500px at 85% -10%, rgba(167,139,250,.22), transparent 60%),
    radial-gradient(700px 500px at 5% 110%, rgba(56,225,214,.14), transparent 55%),
    var(--ink);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
a { color: inherit; text-decoration: none; }

/* ---- nav ---- */
.nav {
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px clamp(18px, 5vw, 48px);
  border-bottom: 1px solid var(--line);
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: blur(12px);
  background: rgba(14,11,26,.72);
}
.brand { font-weight: 800; letter-spacing: 1px; font-size: 20px; }
.brand-mark { color: var(--lime); }
.brand-sub { color: var(--muted); font-weight: 500; font-size: 13px; margin-left: 4px; }
.nav-links { display: flex; align-items: center; gap: clamp(10px, 2vw, 22px); font-weight: 600; }
.nav-links a:not(.btn):hover { color: var(--lime); }
.nav-user { color: var(--muted); font-weight: 500; font-size: 14px; }
.badge { background: var(--coral); color: #fff; font-size: 11px; padding: 1px 7px; border-radius: 999px; }

.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 18px; border-radius: 999px; font-weight: 700; cursor: pointer;
  border: 1px solid transparent; transition: transform .12s ease, box-shadow .12s ease, background .2s;
  font-size: 15px;
}
.btn:hover { transform: translateY(-1px); }
.btn-lime { background: var(--lime); color: var(--lime-ink); box-shadow: 0 8px 24px -8px rgba(198,244,58,.6); }
.btn-coral { background: var(--coral); color: #fff; }
.btn-ghost { border-color: var(--line); color: var(--text); }
.btn-ghost:hover { border-color: var(--lime); color: var(--lime); }
.btn-sm { padding: 6px 12px; font-size: 13px; }

/* ---- flash ---- */
.flash-wrap { position: fixed; top: 76px; right: 20px; z-index: 60; display: flex; flex-direction: column; gap: 8px; }
.flash { padding: 12px 18px; border-radius: 12px; font-weight: 600; box-shadow: var(--shadow); animation: pop .25s ease; }
.flash-ok { background: var(--lime); color: var(--lime-ink); }
.flash-error { background: var(--coral); color: #fff; }
@keyframes pop { from { opacity: 0; transform: translateY(-8px); } to { opacity: 1; } }

/* ---- layout ---- */
.container { width: 100%; max-width: 1080px; margin: 0 auto; padding: clamp(28px, 5vw, 56px) clamp(18px, 5vw, 24px); flex: 1; }
.full { width: 100%; flex: 1; }
.footer {
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px;
  padding: 22px clamp(18px, 5vw, 48px); border-top: 1px solid var(--line);
  color: var(--muted); font-size: 14px;
}

/* ---- hero ---- */
.hero { padding: clamp(48px, 9vw, 110px) clamp(18px, 5vw, 48px) 60px; max-width: 1100px; margin: 0 auto; }
.hero-tag {
  display: inline-flex; align-items: center; gap: 8px; font-weight: 700; font-size: 13px;
  color: var(--lime); border: 1px solid var(--line); padding: 6px 14px; border-radius: 999px; margin-bottom: 22px;
}
.hero h1 { font-size: clamp(38px, 7vw, 74px); line-height: 1.02; letter-spacing: -1px; font-weight: 800; }
.hero h1 .hl { color: var(--lime); }
.hero h1 .hl2 { color: var(--cyan); }
.hero h1 .hl3 { color: var(--coral); }
.hero p.lead { color: var(--muted); font-size: clamp(16px, 2.4vw, 21px); max-width: 620px; margin: 24px 0 34px; }
.hero-cta { display: flex; gap: 14px; flex-wrap: wrap; }

.feature-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 18px; margin-top: 72px; }
.f-card {
  border: 1px solid var(--line); background: linear-gradient(180deg, var(--panel), var(--ink-2));
  border-radius: var(--radius); padding: 26px; transition: transform .15s ease, border-color .2s;
}
.f-card:hover { transform: translateY(-4px); border-color: var(--lime); }
.f-icon { font-size: 30px; }
.f-card h3 { margin: 14px 0 8px; font-size: 20px; }
.f-card p { color: var(--muted); font-size: 15px; }

/* ---- generic panels / cards ---- */
.page-head { display: flex; align-items: flex-end; justify-content: space-between; flex-wrap: wrap; gap: 14px; margin-bottom: 26px; }
.page-head h1 { font-size: clamp(26px, 4vw, 38px); letter-spacing: -.5px; }
.page-head p { color: var(--muted); }
.eyebrow { color: var(--lime); font-weight: 700; letter-spacing: 2px; font-size: 12px; text-transform: uppercase; }

.grid-2 { display: grid; grid-template-columns: 340px 1fr; gap: 24px; align-items: start; }
@media (max-width: 820px) { .grid-2 { grid-template-columns: 1fr; } }

.panel { border: 1px solid var(--line); background: var(--panel); border-radius: var(--radius); padding: 22px; }
.panel h2 { font-size: 18px; margin-bottom: 16px; }

.field { margin-bottom: 14px; }
.field label { display: block; font-size: 13px; color: var(--muted); margin-bottom: 6px; font-weight: 600; }
.field input, .field select, .field textarea {
  width: 100%; padding: 11px 13px; border-radius: 11px; border: 1px solid var(--line);
  background: var(--ink-2); color: var(--text); font-size: 15px; font-family: inherit;
}
.field input:focus, .field select:focus, .field textarea:focus { outline: 2px solid var(--lime); border-color: transparent; }
.field textarea { resize: vertical; min-height: 70px; }
.checkbox { display: flex; align-items: center; gap: 8px; color: var(--muted); font-size: 14px; }
.checkbox input { width: auto; }

/* ---- list / items ---- */
.stat-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px,1fr)); gap: 16px; margin-bottom: 30px; }
.stat { border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; background: var(--panel); }
.stat .n { font-size: 34px; font-weight: 800; color: var(--lime); }
.stat.violet .n { color: var(--violet); }
.stat.coral .n { color: var(--coral); }
.stat .l { color: var(--muted); font-size: 14px; }

.item {
  display: flex; align-items: flex-start; gap: 14px; justify-content: space-between;
  border: 1px solid var(--line); border-radius: 14px; padding: 16px 18px; background: var(--panel);
  margin-bottom: 12px;
}
.item:hover { border-color: var(--violet); }
.item .title { font-weight: 700; font-size: 16px; }
.item .meta { color: var(--muted); font-size: 13px; margin-top: 3px; display: flex; gap: 12px; flex-wrap: wrap; }
.item .notes { color: var(--muted); font-size: 14px; margin-top: 8px; }
.item-actions { display: flex; gap: 8px; align-items: center; flex-shrink: 0; }
.item.done .title { text-decoration: line-through; color: var(--muted); }

.chip { display: inline-block; font-size: 12px; font-weight: 700; padding: 3px 10px; border-radius: 999px; background: var(--ink-2); border: 1px solid var(--line); color: var(--violet); }
.chip.cat { background: rgba(198,244,58,.14); color: var(--lime); border-color: transparent; }
.tag { display: inline-block; font-size: 12px; padding: 2px 8px; border-radius: 8px; background: var(--ink-2); color: var(--cyan); margin: 2px 4px 2px 0; }

.pri-high { color: var(--coral); }
.pri-medium { color: var(--lime); }
.pri-low { color: var(--muted); }

.filters { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 20px; }
.filters a { font-size: 13px; padding: 6px 12px; border-radius: 999px; border: 1px solid var(--line); color: var(--muted); font-weight: 600; }
.filters a.active { background: var(--lime); color: var(--lime-ink); border-color: transparent; }

.empty { text-align: center; color: var(--muted); padding: 40px 20px; border: 1px dashed var(--line); border-radius: var(--radius); }

.link-btn { background: none; border: none; color: var(--coral); cursor: pointer; font-size: 13px; font-weight: 600; font-family: inherit; }
.link-btn:hover { text-decoration: underline; }
.icon-btn { background: var(--ink-2); border: 1px solid var(--line); color: var(--text); border-radius: 10px; padding: 6px 10px; cursor: pointer; font-size: 14px; font-family: inherit; }
.icon-btn:hover { border-color: var(--lime); color: var(--lime); }

/* ---- auth ---- */
.auth-wrap { min-height: calc(100vh - 160px); display: grid; place-items: center; padding: 40px 18px; flex: 1; }
.auth-card { width: 100%; max-width: 400px; border: 1px solid var(--line); background: var(--panel); border-radius: 20px; padding: 34px; box-shadow: var(--shadow); }
.auth-card h1 { font-size: 26px; margin-bottom: 6px; }
.auth-card .sub { color: var(--muted); margin-bottom: 22px; font-size: 15px; }
.auth-card .btn { width: 100%; justify-content: center; margin-top: 6px; }
.auth-alt { text-align: center; margin-top: 18px; color: var(--muted); font-size: 14px; }
.auth-alt a { color: var(--lime); font-weight: 600; }

form.inline { display: inline; }