:root {
  color-scheme: light dark;

  /* base */
  --bg: #e8f1f0;
  --text: #0b1a1c;
  --muted: #4b6064;
  --accent: #059669;
  --accent-hover: #047857;
  --accent-ink: #ffffff;
  --accent-soft: rgba(5, 150, 105, 0.14);
  --danger: #b91c1c;
  --danger-soft: rgba(220, 38, 38, 0.12);
  --warn: #8a5a06;
  --warn-soft: rgba(217, 119, 6, 0.14);

  /* glass */
  --glass: rgba(255, 255, 255, 0.52);
  --glass-strong: rgba(255, 255, 255, 0.72);
  --glass-inset: rgba(255, 255, 255, 0.45);
  --glass-border: rgba(255, 255, 255, 0.75);
  --glass-line: rgba(11, 26, 28, 0.08);
  --glass-highlight: inset 0 1px 0 rgba(255, 255, 255, 0.9);
  --glass-shadow: 0 8px 32px -8px rgba(16, 70, 70, 0.22);
  --blur: blur(22px) saturate(170%);

  /* background orbs */
  --orb-1: #34d399;
  --orb-2: #38bdf8;
  --orb-3: #a78bfa;
  --orb-opacity: 0.55;
  --scrim: rgba(232, 241, 240, 0.38);

  --font: 'Inter', 'Hiragino Sans', 'Noto Sans JP', -apple-system, BlinkMacSystemFont, 'Segoe UI', Meiryo, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Consolas, Menlo, monospace;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #060b12;
    --text: #e9f1f5;
    --muted: #94a7b4;
    --accent: #34d399;
    --accent-hover: #6ee7b7;
    --accent-ink: #03211a;
    --accent-soft: rgba(52, 211, 153, 0.16);
    --danger: #fca5a5;
    --danger-soft: rgba(248, 113, 113, 0.14);
    --warn: #fcd34d;
    --warn-soft: rgba(250, 204, 21, 0.12);

    --glass: rgba(255, 255, 255, 0.06);
    --glass-strong: rgba(255, 255, 255, 0.1);
    --glass-inset: rgba(0, 0, 0, 0.22);
    --glass-border: rgba(255, 255, 255, 0.14);
    --glass-line: rgba(255, 255, 255, 0.09);
    --glass-highlight: inset 0 1px 0 rgba(255, 255, 255, 0.12);
    --glass-shadow: 0 16px 40px -12px rgba(0, 0, 0, 0.6);

    --orb-1: #10b981;
    --orb-2: #0ea5e9;
    --orb-3: #7c3aed;
    --orb-opacity: 0.42;
    --scrim: rgba(6, 11, 18, 0.58);
  }
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; -webkit-tap-highlight-color: transparent; }

/* 背景画像 + 可読性のためのスクリム（iOS Safari は background-attachment:fixed が不安定なため固定レイヤーで描画） */
html::before {
  content: "";
  position: fixed; inset: 0; z-index: 0; pointer-events: none;
  background-image: linear-gradient(var(--scrim), var(--scrim)), url('/image/bg.png');
  background-size: cover; background-position: center; background-repeat: no-repeat;
}

body {
  position: relative;
  font-family: var(--font);
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.65;
  word-break: auto-phrase; /* 日本語を文節で折り返す（未対応ブラウザでは通常動作） */
  overflow-wrap: break-word;
  min-height: 100vh;
  min-height: 100dvh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* ---------- ambient background (glassが映える色の塊) ---------- */
body::before, body::after {
  content: "";
  position: fixed;
  z-index: 0;
  border-radius: 50%;
  filter: blur(80px);
  opacity: var(--orb-opacity);
  pointer-events: none;
}
body::before {
  width: 46vmax; height: 46vmax; top: -14vmax; right: -10vmax;
  background: radial-gradient(circle at 30% 30%, var(--orb-1), var(--orb-2) 70%);
  animation: drift 26s ease-in-out infinite alternate;
}
body::after {
  width: 40vmax; height: 40vmax; bottom: -16vmax; left: -12vmax;
  background: radial-gradient(circle at 60% 40%, var(--orb-3), var(--orb-2) 75%);
  animation: drift 32s ease-in-out infinite alternate-reverse;
}
@keyframes drift {
  from { transform: translate3d(0, 0, 0) scale(1); }
  to   { transform: translate3d(-4vmax, 5vmax, 0) scale(1.12); }
}

/* ---------- glass primitive ---------- */
.glass,
.bar, .result, .panel, .features, .topbar-actions .btn-ghost {
  background: var(--glass);
  -webkit-backdrop-filter: var(--blur);
  backdrop-filter: var(--blur);
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-highlight), var(--glass-shadow);
}
@supports not ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))) {
  .glass, .bar, .result, .panel, .features, .topbar-actions .btn-ghost { background: var(--glass-strong); }
  @media (prefers-color-scheme: dark) {
    .glass, .bar, .result, .panel, .features, .topbar-actions .btn-ghost { background: #121a27; }
  }
}

/* ---------- shell ---------- */
.shell {
  position: relative; z-index: 1;
  max-width: 760px; margin: 0 auto;
  padding-top: max(20px, env(safe-area-inset-top));
  padding-right: max(20px, env(safe-area-inset-right));
  padding-bottom: max(32px, env(safe-area-inset-bottom));
  padding-left: max(20px, env(safe-area-inset-left));
}
.shell.narrow { max-width: 520px; display: flex; flex-direction: column; justify-content: center; min-height: 100dvh; }

.topbar { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 8px 12px; padding: 8px 0 0; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 700; letter-spacing: -.01em; color: var(--text); text-decoration: none; }
.brand img { width: 28px; height: 28px; border-radius: 8px; box-shadow: 0 4px 12px -4px rgba(5, 150, 105, .6); }
.topbar-actions { display: flex; align-items: center; flex-wrap: wrap; justify-content: flex-end; gap: 10px; background: none; border: 0; box-shadow: none; backdrop-filter: none; -webkit-backdrop-filter: none; }

.pill {
  font-size: .78rem; font-weight: 600; padding: 4px 12px; border-radius: 999px;
  background: var(--warn-soft); color: var(--warn);
  border: 1px solid var(--glass-border);
  -webkit-backdrop-filter: var(--blur); backdrop-filter: var(--blur);
}

/* ---------- hero ---------- */
.hero { padding: clamp(40px, 9vw, 88px) 0 28px; }
h1 {
  font-size: clamp(2rem, 6.4vw, 3.4rem);
  line-height: 1.15; font-weight: 800; letter-spacing: -.035em;
  text-wrap: balance;
}
.lead { margin-top: 16px; color: var(--muted); font-size: 1.02rem; max-width: 34em; text-wrap: pretty; }

/* ---------- command bar ---------- */
.bar {
  margin-top: 28px; display: flex; gap: 8px; padding: 8px;
  border-radius: 20px;
  transition: border-color .2s, box-shadow .2s, background .2s;
}
.bar:focus-within {
  background: var(--glass-strong);
  border-color: var(--accent);
  box-shadow: var(--glass-highlight), 0 0 0 4px var(--accent-soft), var(--glass-shadow);
}
.bar input {
  flex: 1; min-width: 0; border: 0; outline: 0; background: transparent;
  color: var(--text); font: inherit; font-size: 1rem; padding: 12px;
}
.bar input::placeholder { color: var(--muted); opacity: .75; }
.bar[data-invalid="true"] { border-color: var(--danger); }
@media (max-width: 560px) {
  .bar { flex-direction: column; }
  .bar .btn { width: 100%; }
}
.field-error { min-height: 1.4em; margin-top: 10px; padding-left: 4px; font-size: .85rem; color: var(--danger); }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  min-height: 44px; padding: 12px 20px; border-radius: 14px; border: 1px solid transparent;
  background: linear-gradient(180deg, color-mix(in srgb, var(--accent) 88%, #fff), var(--accent));
  color: var(--accent-ink);
  box-shadow: inset 0 1px 0 rgba(255,255,255,.35), 0 8px 20px -8px var(--accent);
  font: inherit; font-size: .95rem; font-weight: 650; text-decoration: none; white-space: nowrap;
  cursor: pointer; transition: filter .15s, transform .12s, background .15s;
}
@media (hover: hover) { .btn:hover { filter: brightness(1.06); } }
.btn:active { transform: scale(.98); }
.btn-ghost {
  background: var(--glass); color: var(--text);
  border-color: var(--glass-border);
  box-shadow: var(--glass-highlight);
  -webkit-backdrop-filter: var(--blur); backdrop-filter: var(--blur);
}
@media (hover: hover) { .btn-ghost:hover { background: var(--glass-strong); filter: none; } }
.btn-sm { min-height: 36px; padding: 7px 14px; font-size: .85rem; border-radius: 12px; }
.btn-block { display: flex; width: 100%; }
.btn.copied { background: var(--accent); color: var(--accent-ink); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* ---------- result ---------- */
.result { margin-top: 20px; padding: 20px; border-radius: 22px; animation: rise .3s ease-out; }
.result-label { font-size: .85rem; font-weight: 650; color: var(--muted); margin-bottom: 10px; }
.url-display {
  font-family: var(--mono); font-size: .88rem; line-height: 1.55; word-break: break-all;
  background: var(--glass-inset); border: 1px solid var(--glass-line); border-radius: 14px;
  padding: 12px 14px; max-height: 8em; overflow: auto; user-select: all;
}
.result-meta { margin-top: 10px; font-size: .8rem; color: var(--muted); }
.actions { display: flex; gap: 8px; margin-top: 14px; flex-wrap: wrap; }
.actions .btn { flex: 1 1 140px; white-space: normal; text-align: center; }

/* ---------- responsive ---------- */
@media (min-width: 1024px) {
  .shell { max-width: 860px; }
  .shell.narrow { max-width: 560px; }
}
@media (max-width: 640px) {
  body::before, body::after { filter: blur(56px); } /* 小画面では blur を軽量化 */
  .hero { padding-top: 32px; }
  .features { margin-top: 40px; }
  .features > div { padding: 16px 18px; }
}
@media (max-width: 380px) {
  .shell { padding-left: max(14px, env(safe-area-inset-left)); padding-right: max(14px, env(safe-area-inset-right)); }
  .bar { padding: 6px; border-radius: 18px; }
  .result { padding: 16px; }
  .panel { padding: 24px 16px; border-radius: 22px; }
}
/* 横向きスマホなど高さの低い画面：中央寄せをやめて上から表示 */
@media (max-height: 520px) {
  .shell.narrow { justify-content: flex-start; }
  .hero { padding-top: 24px; }
}

/* ---------- features: ひとつのガラス帯 ---------- */
.features {
  margin-top: 56px; display: grid; grid-template-columns: repeat(3, 1fr);
  border-radius: 22px; padding: 6px 0;
}
.features > div { padding: 18px 22px; }
.features > div + div { border-left: 1px solid var(--glass-line); }
.features h2 { font-size: .98rem; font-weight: 700; margin-bottom: 6px; }
.features p { font-size: .88rem; color: var(--muted); }
@media (max-width: 640px) {
  .features { grid-template-columns: 1fr; }
  .features > div + div { border-left: 0; border-top: 1px solid var(--glass-line); }
}

.note { margin-top: 36px; font-size: .82rem; color: var(--muted); max-width: 44em; }
.note strong { color: var(--text); font-weight: 650; }

/* ---------- confirm / 404 panel ---------- */
.panel { border-radius: 28px; padding: 36px 32px; }
@media (max-width: 480px) { .panel { padding: 28px 20px; } }
.panel h1 { font-size: clamp(1.5rem, 5vw, 1.9rem); letter-spacing: -.025em; }
.panel .lead { margin-top: 8px; font-size: .95rem; }
.center { text-align: center; }
.center .lead { margin-inline: auto; }
.emoji { font-size: 3rem; line-height: 1; margin-bottom: 12px; }

.dest { margin: 24px 0 18px; }
.dest-label { font-size: .8rem; font-weight: 650; color: var(--muted); }
.dest-host { font-size: 1.35rem; font-weight: 750; letter-spacing: -.02em; word-break: break-all; margin-top: 4px; }
.dest-url {
  margin-top: 10px; padding: 12px 14px; font-family: var(--mono); font-size: .8rem; color: var(--muted);
  background: var(--glass-inset); border: 1px solid var(--glass-line); border-radius: 14px;
  word-break: break-all; max-height: 8em; overflow: auto;
}

.callout { border-radius: 14px; padding: 14px 16px; margin-bottom: 14px; font-size: .88rem; border: 1px solid var(--glass-line); }
.callout ul { margin: 6px 0 0 1.2em; }
.callout.warn { background: var(--warn-soft); color: var(--warn); }
.callout.danger { background: var(--danger-soft); color: var(--danger); }
.stack { display: grid; gap: 10px; margin-top: 20px; }

.hidden { display: none !important; }

@keyframes rise { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
}