:root {
  --navy: #14213d;
  --blue: #155eef;
  --blue-soft: #eaf1ff;
  --ink: #1b2436;
  --muted: #64748b;
  --line: #d9e1ef;
  --canvas: #f5f7fb;
  --white: #ffffff;
  --do: #fff0ed;
  --plan: #eff7e9;
  --delegate: #fff8df;
  --later: #f1f1f5;
  --radius: 20px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--canvas);
  color: var(--ink);
  font-family: "Pretendard", "Noto Sans KR", system-ui, sans-serif;
}

button, input, select { font: inherit; }

.page-shell {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
  padding: 72px 0 64px;
}

.hero { max-width: 720px; margin-bottom: 34px; }
.eyebrow, .section-label {
  margin: 0 0 8px;
  color: var(--blue);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.1em;
}
h1, h2, h3, p { margin-top: 0; }
h1 { margin-bottom: 14px; color: var(--navy); font-size: clamp(2rem, 5vw, 3.5rem); letter-spacing: -0.06em; }
h2 { margin-bottom: 0; color: var(--navy); font-size: 1.35rem; letter-spacing: -0.04em; }
h3 { margin-bottom: 4px; font-size: 1.1rem; }
.hero-copy { margin-bottom: 0; color: var(--muted); font-size: 1.05rem; line-height: 1.7; }

.add-card, .guide-card {
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--white);
  box-shadow: 0 12px 30px rgba(30, 57, 100, 0.05);
}

#task-form { display: grid; grid-template-columns: minmax(220px, 2fr) 1fr 1fr auto; gap: 12px; margin-top: 24px; }
.field { display: grid; gap: 7px; color: var(--muted); font-size: 0.8rem; font-weight: 700; }
.field input, .field select {
  min-height: 46px;
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--white);
  color: var(--ink);
  padding: 0 12px;
  outline-color: var(--blue);
}
.primary-button {
  align-self: end;
  min-height: 46px;
  border: 0;
  border-radius: 10px;
  background: var(--blue);
  color: var(--white);
  cursor: pointer;
  font-weight: 800;
  padding: 0 18px;
}
.primary-button:hover { background: #0746cb; }
.form-message { min-height: 1.2em; margin: 12px 0 0; color: #bd263d; font-size: 0.88rem; }

.matrix-heading { display: flex; align-items: end; justify-content: space-between; gap: 16px; margin-bottom: 16px; }
.task-count { margin: 0; color: var(--muted); font-size: 0.9rem; }
.matrix { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.quadrant { min-height: 265px; border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; }
.quadrant-do { background: var(--do); }
.quadrant-plan { background: var(--plan); }
.quadrant-delegate { background: var(--delegate); }
.quadrant-later { background: var(--later); }
.quadrant-header { display: flex; align-items: flex-start; gap: 12px; }
.quadrant-number { display: grid; width: 31px; height: 31px; place-items: center; border-radius: 50%; background: rgba(255,255,255,0.7); color: var(--navy); font-size: 0.75rem; font-weight: 850; }
.quadrant-header p { margin: 0; color: #667085; font-size: 0.82rem; }
.task-list { min-height: 92px; margin: 20px 0 0; padding: 0; list-style: none; }
.task-item { display: flex; align-items: center; justify-content: space-between; gap: 10px; padding: 10px 0; border-bottom: 1px solid rgba(58, 74, 105, 0.14); }
.task-check { display: flex; min-width: 0; align-items: center; gap: 9px; cursor: pointer; }
.complete-checkbox { width: 17px; height: 17px; accent-color: var(--blue); }
.task-text { overflow-wrap: anywhere; font-size: 0.93rem; font-weight: 650; }
.task-item.is-complete .task-text { color: var(--muted); text-decoration: line-through; }
.delete-button { border: 0; background: transparent; color: #7a4a51; cursor: pointer; font-size: 0.76rem; font-weight: 700; padding: 5px; }
.empty-message { color: var(--muted); font-size: 0.86rem; padding-top: 8px; }

.guide-card { display: flex; justify-content: space-between; gap: 32px; margin-top: 36px; }
.guide-card ul { margin: 4px 0 0; padding-left: 20px; color: var(--muted); font-size: 0.9rem; line-height: 1.8; }
.guide-card strong { color: var(--ink); }

@media (max-width: 760px) {
  .page-shell { padding-top: 42px; }
  #task-form, .matrix { grid-template-columns: 1fr; }
  .guide-card { display: block; }
  .guide-card ul { margin-top: 18px; }
}