:root {
  --bg: #f6f7fb;
  --surface: #ffffff;
  --surface-2: #eef2f7;
  --ink: #18202f;
  --muted: #647084;
  --line: #dbe2ec;
  --primary: #087f8c;
  --primary-dark: #06606a;
  --accent: #f59e0b;
  --success: #148a5b;
  --danger: #c24132;
  --shadow: 0 14px 35px rgba(20, 32, 48, 0.08);
  --radius: 8px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.55;
}

a {
  color: inherit;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 255, 255, 0.94);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(14px);
}

.header-inner,
.container {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
}

.header-inner {
  display: flex;
  min-height: 68px;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-weight: 800;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 34px;
  height: 34px;
  place-items: center;
  border-radius: var(--radius);
  background: var(--primary);
  color: #fff;
  font-size: 17px;
}

.nav {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav a {
  padding: 10px 12px;
  border-radius: var(--radius);
  color: var(--muted);
  font-size: 0.94rem;
  font-weight: 650;
  text-decoration: none;
}

.nav a:hover,
.nav a[aria-current="page"] {
  background: var(--surface-2);
  color: var(--ink);
}

.mobile-toggle {
  display: none;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--ink);
  min-width: 42px;
  min-height: 38px;
  font-size: 1.2rem;
}

.hero {
  padding: 72px 0 42px;
  background:
    radial-gradient(circle at 10% 20%, rgba(8, 127, 140, 0.12), transparent 28%),
    linear-gradient(180deg, #fff 0%, var(--bg) 100%);
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(320px, 0.95fr);
  gap: 44px;
  align-items: center;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--primary);
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  line-height: 1.15;
}

h1 {
  margin: 0;
  max-width: 760px;
  font-size: clamp(2.2rem, 5vw, 4.4rem);
  letter-spacing: 0;
}

.hero p {
  max-width: 690px;
  margin: 20px 0 0;
  color: var(--muted);
  font-size: 1.1rem;
}

.hero-actions,
.tool-actions,
.inline-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.btn {
  display: inline-flex;
  min-height: 42px;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  padding: 10px 15px;
  background: var(--surface);
  color: var(--ink);
  font: inherit;
  font-weight: 750;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.16s ease, background 0.16s ease, border-color 0.16s ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: var(--primary);
  color: #fff;
}

.btn-primary:hover {
  background: var(--primary-dark);
}

.btn-secondary {
  border-color: var(--line);
}

.btn-accent {
  background: var(--accent);
  color: #201400;
}

.hero-panel,
.panel,
.tool-card,
.info-card,
.faq-item {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.hero-panel {
  padding: 24px;
}

.mini-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.mini-stat {
  padding: 16px;
  border-radius: var(--radius);
  background: var(--surface-2);
}

.mini-stat strong {
  display: block;
  font-size: 1.55rem;
}

.mini-stat span {
  color: var(--muted);
  font-size: 0.88rem;
}

.section {
  padding: 58px 0;
}

.section-header {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 24px;
}

.section-header h2 {
  margin: 0;
  font-size: 2rem;
}

.section-header p {
  max-width: 620px;
  margin: 8px 0 0;
  color: var(--muted);
}

.tools-grid,
.info-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.tool-card {
  display: flex;
  min-height: 210px;
  flex-direction: column;
  padding: 22px;
  text-decoration: none;
  transition: transform 0.16s ease, border-color 0.16s ease;
}

.tool-card:hover {
  border-color: rgba(8, 127, 140, 0.45);
  transform: translateY(-3px);
}

.tool-icon {
  display: grid;
  width: 42px;
  height: 42px;
  place-items: center;
  border-radius: var(--radius);
  background: #dff5f7;
  color: var(--primary);
  font-weight: 900;
}

.tool-card h3,
.info-card h3 {
  margin: 18px 0 8px;
  font-size: 1.13rem;
}

.tool-card p,
.info-card p,
.faq-item p {
  margin: 0;
  color: var(--muted);
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin-top: auto;
  padding-top: 18px;
}

.tag {
  border-radius: 999px;
  background: var(--surface-2);
  padding: 4px 9px;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 700;
}

.info-card {
  padding: 22px;
  box-shadow: none;
}

.page-hero {
  padding: 48px 0 28px;
}

.breadcrumb {
  margin-bottom: 14px;
  color: var(--muted);
  font-size: 0.92rem;
}

.breadcrumb a {
  color: var(--primary);
  font-weight: 750;
  text-decoration: none;
}

.page-hero h1 {
  font-size: clamp(2rem, 4vw, 3.4rem);
}

.page-hero p {
  max-width: 760px;
  margin: 16px 0 0;
  color: var(--muted);
  font-size: 1.05rem;
}

.tool-shell {
  padding-bottom: 52px;
}

.tool-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 18px;
  align-items: stretch;
}

.tool-layout.single {
  grid-template-columns: 1fr;
}

.panel {
  overflow: hidden;
}

.panel-header {
  display: flex;
  min-height: 58px;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  border-bottom: 1px solid var(--line);
  padding: 14px 16px;
}

.panel-header h2,
.panel-header h3 {
  margin: 0;
  font-size: 1rem;
}

.panel-body {
  padding: 16px;
}

textarea,
input[type="text"],
select {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fbfcfe;
  color: var(--ink);
  font: inherit;
}

textarea {
  min-height: 340px;
  padding: 14px;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  font-size: 0.92rem;
  line-height: 1.55;
  resize: vertical;
  tab-size: 2;
}

input[type="text"],
select {
  min-height: 42px;
  padding: 10px 12px;
}

textarea:focus,
input[type="text"]:focus,
select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(8, 127, 140, 0.13);
  outline: none;
}

.output-textarea {
  background: #f8fafc;
}

.settings {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 14px;
}

.setting {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 650;
}

.preview-frame {
  width: 100%;
  min-height: 420px;
  border: 0;
  background: #fff;
}

.status {
  min-height: 24px;
  margin-top: 12px;
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 650;
}

.status.success {
  color: var(--success);
}

.status.error {
  color: var(--danger);
}

.note {
  margin-top: 14px;
  border-left: 4px solid var(--primary);
  border-radius: var(--radius);
  background: #eaf7f8;
  padding: 12px 14px;
  color: #25545b;
  font-size: 0.93rem;
}

.hash-output {
  display: grid;
  gap: 14px;
}

.result-box {
  min-height: 52px;
  overflow-wrap: anywhere;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #f8fafc;
  padding: 14px;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}

.faq-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.faq-item {
  padding: 18px;
  box-shadow: none;
}

.faq-item h3 {
  margin: 0 0 8px;
  font-size: 1rem;
}

.site-footer {
  border-top: 1px solid var(--line);
  background: #111827;
  color: #d1d5db;
  padding: 42px 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 24px;
}

.footer-grid > div {
  min-width: 0;
}

.site-footer p,
.site-footer a,
.site-footer span {
  overflow-wrap: anywhere;
}

.site-footer a {
  color: #d1d5db;
  text-decoration: none;
}

.site-footer a:hover {
  color: #fff;
}

.footer-links {
  display: grid;
  gap: 8px;
}

.footer-title {
  margin: 0 0 12px;
  color: #fff;
  font-weight: 800;
}

.footer-bottom {
  margin-top: 32px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  padding-top: 20px;
  text-align: center;
  color: #9ca3af;
  font-size: 0.92rem;
}

.footer-bottom p {
  margin: 0;
}

.toast {
  position: fixed;
  right: 18px;
  bottom: 18px;
  z-index: 50;
  max-width: min(380px, calc(100% - 36px));
  border-radius: var(--radius);
  background: #101827;
  color: #fff;
  padding: 12px 14px;
  box-shadow: var(--shadow);
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 0.18s ease, transform 0.18s ease;
}

.toast.show {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 920px) {
  .hero-grid,
  .tool-layout,
  .tools-grid,
  .info-grid {
    grid-template-columns: 1fr;
  }

  .hero {
    padding-top: 50px;
  }

  .section-header {
    display: block;
  }
}

@media (max-width: 720px) {
  .mobile-toggle {
    display: inline-grid;
    place-items: center;
  }

  .nav {
    position: absolute;
    top: 68px;
    right: 16px;
    left: 16px;
    display: none;
    flex-direction: column;
    align-items: stretch;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: var(--surface);
    padding: 10px;
    box-shadow: var(--shadow);
  }

  .nav.open {
    display: flex;
  }

  .nav a {
    width: 100%;
  }

  .mini-grid,
  .faq-grid,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  textarea {
    min-height: 280px;
  }

  .preview-frame {
    min-height: 340px;
  }
}