:root {
  --bg: #e7eef5;
  --bg-deep: #d5e0eb;
  --ink: #0b1f33;
  --ink-soft: #3a556d;
  --panel: rgba(255, 255, 255, 0.72);
  --line: rgba(11, 31, 51, 0.14);
  --accent: #0f6e6e;
  --accent-ink: #063b3b;
  --danger: #9b2c2c;
  --shadow: 0 18px 40px rgba(11, 31, 51, 0.08);
  --radius: 4px;
  --font-display: "Avenir Next", "Segoe UI", "Helvetica Neue", sans-serif;
  --font-body: "Avenir Next", "Segoe UI", "Helvetica Neue", sans-serif;
  --font-mono: "SF Mono", "Cascadia Code", "Consolas", "Liberation Mono", monospace;
  --max: 72rem;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  color-scheme: light;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-body);
  color: var(--ink);
  background:
    linear-gradient(180deg, rgba(231, 238, 245, 0.92), rgba(213, 224, 235, 0.96)),
    repeating-linear-gradient(
      0deg,
      transparent,
      transparent 23px,
      rgba(11, 31, 51, 0.045) 23px,
      rgba(11, 31, 51, 0.045) 24px
    ),
    repeating-linear-gradient(
      90deg,
      transparent,
      transparent 23px,
      rgba(11, 31, 51, 0.045) 23px,
      rgba(11, 31, 51, 0.045) 24px
    ),
    var(--bg);
  line-height: 1.5;
}

a {
  color: var(--accent-ink);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

a:hover {
  color: var(--accent);
}

.site-header {
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.55);
  backdrop-filter: blur(10px);
}

.site-header__inner,
.site-main,
.site-footer__inner {
  width: min(100% - 2rem, var(--max));
  margin-inline: auto;
}

.site-header__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem 1.25rem;
  padding: 0.9rem 0;
}

.brand {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: -0.03em;
  font-size: 1.35rem;
  color: var(--ink);
  text-decoration: none;
}

.brand:hover {
  color: var(--accent);
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 0.85rem;
  flex: 1;
}

.site-nav a {
  font-size: 0.92rem;
  color: var(--ink-soft);
  text-decoration: none;
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  color: var(--ink);
  text-decoration: underline;
}

.lang-switch {
  display: inline-flex;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--panel);
}

.lang-switch button {
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--ink-soft);
  font: inherit;
  font-size: 0.8rem;
  letter-spacing: 0.04em;
  padding: 0.35rem 0.55rem;
  cursor: pointer;
}

.lang-switch button.is-active {
  background: var(--ink);
  color: #f4f8fb;
}

.site-main {
  padding: 2.5rem 0 4rem;
  animation: rise 0.45s ease-out both;
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(0.4rem);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.hero {
  padding: 1.5rem 0 2.25rem;
  max-width: 38rem;
}

.hero h1 {
  margin: 0 0 0.6rem;
  font-family: var(--font-display);
  font-size: clamp(2.6rem, 6vw, 4.2rem);
  line-height: 0.95;
  letter-spacing: -0.045em;
}

.hero p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 1.05rem;
  max-width: 32rem;
}

.tool-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.85rem;
}

.tool-list a {
  display: grid;
  gap: 0.2rem;
  padding: 1rem 1.1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  box-shadow: var(--shadow);
  text-decoration: none;
  color: inherit;
  transition: transform 0.15s ease, border-color 0.15s ease;
}

.tool-list a:hover {
  transform: translateY(-1px);
  border-color: rgba(15, 110, 110, 0.45);
}

.tool-list strong {
  font-family: var(--font-mono);
  font-size: 0.98rem;
}

.tool-list span {
  color: var(--ink-soft);
  font-size: 0.95rem;
}

.page-intro {
  margin-bottom: 1.5rem;
  max-width: 40rem;
}

.page-intro h1 {
  margin: 0 0 0.4rem;
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 3vw, 2.4rem);
  letter-spacing: -0.03em;
}

.page-intro p {
  margin: 0;
  color: var(--ink-soft);
}

.panel {
  display: grid;
  gap: 1rem;
  padding: 1.1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  box-shadow: var(--shadow);
}

.field {
  display: grid;
  gap: 0.4rem;
}

.field label {
  font-size: 0.85rem;
  letter-spacing: 0.02em;
  color: var(--ink-soft);
}

textarea {
  width: 100%;
  min-height: 10rem;
  resize: vertical;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 0.85rem 0.95rem;
  font: 0.95rem/1.45 var(--font-mono);
  color: var(--ink);
  background: rgba(255, 255, 255, 0.9);
}

textarea:focus {
  outline: 2px solid rgba(15, 110, 110, 0.35);
  outline-offset: 1px;
}

.actions,
.mode-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

button,
.button {
  appearance: none;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  color: var(--ink);
  font: inherit;
  font-size: 0.92rem;
  padding: 0.55rem 0.85rem;
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}

button:hover,
.button:hover {
  border-color: rgba(15, 110, 110, 0.5);
}

button.primary,
.mode-row button.is-active {
  background: var(--accent);
  border-color: var(--accent);
  color: #f3fbfb;
}

button.is-copied {
  background: var(--ink);
  border-color: var(--ink);
  color: #f4f8fb;
}

.meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--ink-soft);
}

.error {
  margin: 0;
  color: var(--danger);
  font-size: 0.92rem;
}

.site-footer {
  border-top: 1px solid var(--line);
  padding: 1rem 0 1.5rem;
  color: var(--ink-soft);
  font-size: 0.85rem;
}

@media (max-width: 720px) {
  .site-header__inner {
    align-items: flex-start;
  }

  .lang-switch {
    margin-left: auto;
  }

  textarea {
    min-height: 8.5rem;
  }
}