:root {
  --ink-navy: #14213D;
  --blueprint: #1B3A5C;
  --blueprint-mid: #2C5480;
  --blueprint-line: #3E6690;
  --blueprint-tint: #EAF1F8;
  --paper: #F4F3EE;
  --paper-panel: #FFFFFF;
  --graphite: #1A1A1A;
  --graphite-soft: #5B6472;
  --hairline: #DEDACD;
  --amber: #E8A33D;
  --amber-dark: #C7862A;
  --green: #3F7D58;
  --red: #B54339;

  --font-display: 'Space Grotesk', sans-serif;
  --font-body: 'Inter', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--graphite);
  font-family: var(--font-body);
  min-height: 100vh;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation: none !important; transition: none !important; }
}

a { color: inherit; }

/* ================= NAV ================= */
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 40px;
  max-width: 1080px;
  margin: 0 auto;
}
.nav__brand {
  display: flex;
  align-items: center;
  gap: 9px;
  text-decoration: none;
  color: var(--ink-navy);
}
.nav__mark {
  font-family: var(--font-mono);
  font-size: 20px;
  color: var(--amber-dark);
}
.nav__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
}
.nav__links { display: flex; gap: 28px; }
.nav__links a {
  text-decoration: none;
  font-size: 14px;
  color: var(--graphite-soft);
  transition: color 0.15s;
}
.nav__links a:hover { color: var(--blueprint); }

/* ================= HERO ================= */
.hero {
  max-width: 720px;
  margin: 0 auto;
  padding: 28px 24px 64px;
  text-align: center;
}
.hero__eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--blueprint-mid);
  background: var(--blueprint-tint);
  padding: 6px 14px;
  border-radius: 20px;
  margin-bottom: 22px;
}
.hero__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 40px;
  line-height: 1.15;
  letter-spacing: -0.015em;
  color: var(--ink-navy);
  margin: 0 0 16px;
}
.hero__subtitle {
  font-size: 16px;
  line-height: 1.6;
  color: var(--graphite-soft);
  margin: 0 0 40px;
}

/* ---- Конвертер-виджет (карточка) ---- */
.converter {
  background: var(--paper-panel);
  border: 1px solid var(--hairline);
  border-radius: 14px;
  padding: 26px 26px 30px;
  box-shadow: 0 24px 48px -28px rgba(20, 33, 61, 0.28);
  text-align: left;
}

.preset-switch {
  display: flex;
  gap: 4px;
  background: var(--paper);
  border: 1px solid var(--hairline);
  border-radius: 9px;
  padding: 4px;
  margin-bottom: 22px;
}
.preset-btn {
  flex: 1;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 13px;
  background: transparent;
  color: var(--graphite-soft);
  border: none;
  border-radius: 6px;
  padding: 10px 8px;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}
.preset-btn:hover { color: var(--blueprint); }
.preset-btn.is-active {
  background: var(--blueprint);
  color: #fff;
}

.format-pair {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  margin-bottom: 18px;
}
.format-badge {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 15px;
  letter-spacing: 0.02em;
  background: var(--blueprint-tint);
  color: var(--blueprint);
  padding: 10px 18px;
  border-radius: 8px;
  min-width: 92px;
  text-align: center;
}
.format-arrow {
  font-size: 18px;
  color: var(--graphite-soft);
}
.format-badge--select-wrap {
  background: var(--amber);
  color: var(--ink-navy);
  padding: 0;
  position: relative;
}
.format-select {
  appearance: none;
  -webkit-appearance: none;
  background: transparent;
  border: none;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 15px;
  color: var(--ink-navy);
  padding: 10px 32px 10px 18px;
  min-width: 92px;
  text-align: center;
  text-align-last: center;
  cursor: pointer;
}
.format-select:disabled { cursor: default; opacity: 1; -webkit-text-fill-color: var(--ink-navy); }
.format-badge--select-wrap::after {
  content: "";
  position: absolute;
  right: 12px;
  top: 50%;
  width: 7px;
  height: 7px;
  border-right: 2px solid var(--ink-navy);
  border-bottom: 2px solid var(--ink-navy);
  transform: translateY(-70%) rotate(45deg);
  pointer-events: none;
}
.format-badge--select-wrap.is-locked::after { opacity: 0.35; }

.converter__desc {
  font-size: 13.5px;
  line-height: 1.55;
  color: var(--graphite-soft);
  text-align: center;
  margin: 0 0 22px;
  min-height: 40px;
}
.converter__desc code {
  font-family: var(--font-mono);
  background: var(--paper);
  padding: 1px 5px;
  border-radius: 3px;
  color: var(--blueprint);
}

/* ---- Dropzone с рег.метками ---- */
.dropzone {
  position: relative;
  border: 1.5px dashed var(--blueprint-line);
  background: var(--paper);
  border-radius: 10px;
  padding: 34px 20px;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
}
.dropzone:hover, .dropzone.is-dragover {
  border-color: var(--amber);
  background: #FFF8ED;
}
.dropzone__input { position: absolute; inset: 0; opacity: 0; cursor: pointer; }

.dropzone__corner {
  position: absolute;
  width: 14px;
  height: 14px;
  border: 1.5px solid var(--blueprint-mid);
  pointer-events: none;
}
.dropzone__corner.tl { top: 6px; left: 6px; border-right: none; border-bottom: none; }
.dropzone__corner.tr { top: 6px; right: 6px; border-left: none; border-bottom: none; }
.dropzone__corner.bl { bottom: 6px; left: 6px; border-right: none; border-top: none; }
.dropzone__corner.br { bottom: 6px; right: 6px; border-left: none; border-top: none; }

.dropzone__icon { font-size: 24px; color: var(--blueprint-mid); margin-bottom: 8px; }
.dropzone__label { font-size: 14px; color: var(--graphite-soft); }
.dropzone__file {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--blueprint);
  background: var(--blueprint-tint);
  display: inline-block;
  padding: 5px 12px;
  border-radius: 6px;
}

/* ---- Кнопка / статус ---- */
.btn {
  width: 100%;
  margin-top: 20px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 15px;
  padding: 15px 26px;
  border-radius: 9px;
  border: none;
  cursor: pointer;
  transition: transform 0.08s, background 0.15s, opacity 0.15s;
}
.btn:active { transform: scale(0.985); }
.btn--primary { background: var(--amber); color: var(--ink-navy); }
.btn--primary:hover:not(:disabled) { background: var(--amber-dark); }
.btn:disabled { opacity: 0.4; cursor: not-allowed; }

.status {
  margin-top: 16px;
  font-family: var(--font-mono);
  font-size: 13px;
  padding: 12px 14px;
  border-radius: 8px;
  line-height: 1.5;
}
.status.is-progress { background: var(--blueprint-tint); color: var(--blueprint); }
.status.is-error { background: #FBEBE9; color: var(--red); }
.status.is-success { background: #EAF5EE; color: var(--green); }

/* ================= SHORTCUTS ================= */
.shortcuts {
  max-width: 1000px;
  margin: 0 auto;
  padding: 0 24px 72px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.shortcut-card {
  background: var(--paper-panel);
  border: 1px solid var(--hairline);
  border-radius: 10px;
  padding: 18px 20px;
  text-align: left;
  cursor: pointer;
  transition: border-color 0.15s, transform 0.1s;
  font-family: var(--font-body);
}
.shortcut-card:hover { border-color: var(--blueprint-line); transform: translateY(-2px); }
.shortcut-card__pair {
  display: block;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 14px;
  color: var(--ink-navy);
  margin-bottom: 6px;
}
.shortcut-card__pair span { color: var(--amber-dark); margin: 0 4px; }
.shortcut-card__desc { font-size: 12.5px; color: var(--graphite-soft); line-height: 1.4; }

/* ================= SECTION TITLES ================= */
.section-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 26px;
  color: var(--ink-navy);
  margin: 0 0 8px;
}
.section-subtitle {
  font-size: 14px;
  color: var(--graphite-soft);
  margin: 0 0 28px;
}

/* ================= CATALOG ================= */
.catalog {
  max-width: 1000px;
  margin: 0 auto;
  padding: 40px 24px 72px;
  border-top: 1px solid var(--hairline);
}
.catalog__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}
.catalog__card {
  background: var(--paper-panel);
  border: 1px solid var(--hairline);
  border-radius: 10px;
  padding: 18px 20px;
}
.catalog__card-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 12px;
}
.catalog__card-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 15px;
  color: var(--ink-navy);
}
.catalog__card-note {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--graphite-soft);
}
.catalog__tags { display: flex; flex-wrap: wrap; gap: 6px; }
.tag {
  font-family: var(--font-mono);
  font-size: 11.5px;
  background: var(--paper);
  color: var(--blueprint);
  padding: 4px 9px;
  border-radius: 5px;
  text-transform: uppercase;
}

/* ================= SECURITY ================= */
.security {
  max-width: 1000px;
  margin: 0 auto;
  padding: 8px 24px 80px;
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 40px;
  align-items: center;
}
.security__text p {
  font-size: 14.5px;
  line-height: 1.65;
  color: var(--graphite-soft);
  margin: 0 0 18px;
}
.security__list {
  margin: 0;
  padding-left: 20px;
  font-size: 14px;
  line-height: 1.9;
  color: var(--graphite);
}
.security__mark {
  position: relative;
  background: var(--ink-navy);
  border-radius: 14px;
  aspect-ratio: 1.4;
  display: flex;
  align-items: center;
  justify-content: center;
}
.security__mark span {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.18em;
  color: var(--amber);
  border: 1px solid var(--amber);
  padding: 10px 18px;
  border-radius: 3px;
  transform: rotate(-6deg);
}
.security__mark-corner {
  position: absolute;
  width: 18px;
  height: 18px;
  border: 1.5px solid #4C6E96;
}
.security__mark-corner.tl { top: 14px; left: 14px; border-right: none; border-bottom: none; }
.security__mark-corner.tr { top: 14px; right: 14px; border-left: none; border-bottom: none; }
.security__mark-corner.bl { bottom: 14px; left: 14px; border-right: none; border-top: none; }
.security__mark-corner.br { bottom: 14px; right: 14px; border-left: none; border-top: none; }

/* ================= FOOTER (titleblock) ================= */
.titleblock {
  display: flex;
  border-top: 1px solid var(--hairline);
  background: #EDEBE2;
  font-size: 12px;
}
.titleblock__cell {
  flex: 1;
  padding: 14px 24px;
  border-right: 1px solid var(--hairline);
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.titleblock__cell:last-child { border-right: none; }
.titleblock__cell b {
  font-family: var(--font-mono);
  font-size: 10.5px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--graphite-soft);
}
.titleblock__cell span { color: var(--graphite); }

/* ================= AUTH (login page) ================= */
.auth-body {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background-image:
    linear-gradient(rgba(20, 33, 61, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(20, 33, 61, 0.045) 1px, transparent 1px);
  background-size: 28px 28px;
}
.auth-card {
  position: relative;
  width: 100%;
  max-width: 380px;
  background: var(--paper-panel);
  border: 1px solid var(--hairline);
  border-radius: 14px;
  padding: 36px 32px;
  box-shadow: 0 24px 48px -28px rgba(20, 33, 61, 0.28);
  text-align: center;
}
.auth-card::before, .auth-card::after {
  content: "";
  position: absolute;
  width: 16px;
  height: 16px;
  border: 1.5px solid var(--blueprint-mid);
}
.auth-card::before { top: 10px; left: 10px; border-right: none; border-bottom: none; }
.auth-card::after { bottom: 10px; right: 10px; border-left: none; border-top: none; }
.auth-card__mark {
  font-family: var(--font-mono);
  font-size: 26px;
  color: var(--amber-dark);
  margin-bottom: 6px;
}
.auth-card__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 21px;
  color: var(--ink-navy);
  margin: 0 0 6px;
}
.auth-card__subtitle {
  font-size: 13.5px;
  color: var(--graphite-soft);
  line-height: 1.5;
  margin: 0 0 22px;
}
.auth-form {
  text-align: left;
  display: flex;
  flex-direction: column;
}
.auth-form__label {
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--graphite-soft);
  margin: 14px 0 6px;
}
.auth-form__label:first-of-type { margin-top: 0; }
.auth-form__input {
  font-family: var(--font-body);
  font-size: 14px;
  padding: 11px 14px;
  border: 1px solid var(--hairline);
  border-radius: 8px;
  background: var(--paper);
  color: var(--graphite);
}
.auth-form__input:focus {
  outline: none;
  border-color: var(--blueprint-line);
  background: #fff;
}

/* ================= RESPONSIVE ================= */
@media (max-width: 760px) {
  .nav { padding: 16px 20px; }
  .hero { padding: 20px 18px 48px; }
  .hero__title { font-size: 30px; }
  .converter { padding: 20px 18px 24px; }
  .format-badge, .format-select { font-size: 13px; min-width: 74px; padding: 9px 12px; }
  .shortcuts { grid-template-columns: 1fr; padding-bottom: 56px; }
  .catalog__grid { grid-template-columns: 1fr; }
  .security { grid-template-columns: 1fr; padding-bottom: 56px; }
  .security__mark { aspect-ratio: auto; padding: 30px; }
  .titleblock { flex-direction: column; }
  .titleblock__cell { border-right: none; border-bottom: 1px solid var(--hairline); }
}