:root {
  --color-bg: oklch(98% 0.005 250);
  --color-surface: oklch(100% 0 0);
  --color-text: oklch(22% 0.02 260);
  --color-muted: oklch(55% 0.02 260);
  --color-accent: oklch(52% 0.16 264);
  --color-accent-strong: oklch(44% 0.17 264);
  --color-error: oklch(55% 0.19 25);
  --color-border: oklch(90% 0.01 260);

  --text-title: clamp(1.7rem, 1.2rem + 2vw, 2.4rem);
  --space: clamp(1rem, 0.6rem + 1.6vw, 1.6rem);
  --radius: 14px;
  --shadow: 0 1px 2px oklch(20% 0.02 260 / 0.06), 0 8px 24px oklch(20% 0.02 260 / 0.08);
  --duration: 180ms;
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100dvh;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  line-height: 1.5;
  display: grid;
  place-items: start center;
  padding: var(--space);
}

.shell { width: 100%; max-width: 640px; }

.title { font-size: var(--text-title); font-weight: 700; letter-spacing: -0.02em; margin: 0.2em 0 0.1em; }
.subtitle { color: var(--color-muted); margin: 0 0 1.5rem; }

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: var(--space);
  display: grid;
  gap: 1rem;
}

.field { display: grid; gap: 0.35rem; }
.field span { font-size: 0.85rem; font-weight: 600; color: var(--color-muted); }

input {
  font: inherit;
  padding: 0.7rem 0.85rem;
  border: 1px solid var(--color-border);
  border-radius: 10px;
  background: var(--color-bg);
  transition: border-color var(--duration) var(--ease), box-shadow var(--duration) var(--ease);
}
input:focus-visible {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px oklch(52% 0.16 264 / 0.18);
}

.btn {
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  padding: 0.7rem 1.1rem;
  border: 0;
  border-radius: 10px;
  color: oklch(99% 0 0);
  background: var(--color-accent);
  transition: transform var(--duration) var(--ease), background var(--duration) var(--ease);
}
.btn:hover { background: var(--color-accent-strong); }
.btn:active { transform: translateY(1px); }
.btn:disabled { opacity: 0.6; cursor: progress; }
.btn-ghost { background: transparent; color: var(--color-accent); padding: 0.4rem 0.7rem; }
.btn-ghost:hover { background: oklch(52% 0.16 264 / 0.08); }

.topbar { display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.who { color: var(--color-muted); font-size: 0.9rem; }

.error { color: var(--color-error); font-size: 0.85rem; margin: 0; }

.result { margin-top: 1.5rem; animation: rise var(--duration) var(--ease); }
@keyframes rise { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }

.result-url { font-size: 0.85rem; color: var(--color-muted); word-break: break-all; }
.badge {
  display: inline-block; font-size: 0.72rem; font-weight: 600;
  color: var(--color-accent-strong); background: oklch(52% 0.16 264 / 0.1);
  padding: 0.1rem 0.5rem; border-radius: 999px; margin-left: 0.4rem;
}

.kw-table { width: 100%; border-collapse: collapse; margin: 0.75rem 0; }
.kw-table th, .kw-table td { text-align: left; padding: 0.6rem 0.5rem; border-bottom: 1px solid var(--color-border); }
.kw-table th { font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.04em; color: var(--color-muted); }
.kw-table .num { text-align: right; font-variant-numeric: tabular-nums; }

.total { font-size: 1.05rem; }
.total strong { font-size: 1.3rem; color: var(--color-accent-strong); }

.empty { margin-top: 1.5rem; color: var(--color-muted); }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
}