:root {
  --primary: #7c3f12;
  --primary-dark: #3f2412;
  --accent: #0f766e;
  --accent-soft: #ccfbf1;
  --bg: #f6f4ef;
  --surface: #ffffff;
  --text: #17211d;
  --text-muted: #65716c;
  --border: #ded6c8;
  --success: #0f9f6e;
  --warning: #b7791f;
  --danger: #dc2626;
  --radius: 16px;
  --shadow: 0 18px 48px rgba(63, 36, 18, .11);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-height: 100vh;
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text);
  background:
    linear-gradient(135deg, rgba(124, 63, 18, .08), transparent 34%),
    linear-gradient(225deg, rgba(15, 118, 110, .08), transparent 38%),
    var(--bg);
}

a { color: inherit; }

.top-nav {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 255, 255, .86);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(222, 214, 200, .7);
}

.nav-inner {
  width: min(1180px, calc(100% - 32px));
  height: 66px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.logo {
  font-weight: 900;
  color: var(--primary-dark);
  text-decoration: none;
  letter-spacing: 0;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 6px;
}

.nav-links a {
  text-decoration: none;
  font-weight: 700;
  color: var(--text-muted);
  padding: 9px 14px;
  border-radius: 999px;
}

.nav-links a:hover { background: rgba(124, 63, 18, .08); color: var(--primary); }
.nav-links a.active { background: var(--primary); color: #fff; }

.hamburger {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: #fff;
  padding: 10px;
}

.hamburger span {
  display: block;
  height: 2px;
  background: var(--primary-dark);
  margin: 5px 0;
}

.hero {
  padding: 64px 20px 36px;
  text-align: center;
}

.hero-content { max-width: 760px; margin: 0 auto; }
.hero-chip {
  display: inline-flex;
  padding: 7px 14px;
  border-radius: 999px;
  background: rgba(15, 118, 110, .1);
  color: var(--accent);
  font-weight: 900;
  font-size: .76rem;
}

.hero h1 {
  margin: 18px 0 14px;
  color: var(--primary-dark);
  font-size: clamp(2.1rem, 6vw, 4rem);
  line-height: 1.05;
  font-weight: 900;
  letter-spacing: 0;
}

.hero-sub {
  margin: 0 auto;
  max-width: 720px;
  color: var(--text-muted);
  font-size: 1rem;
  line-height: 1.7;
}

.main-wrap {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto 60px;
}

.glass-card {
  background: rgba(255, 255, 255, .94);
  border: 1px solid rgba(222, 214, 200, .86);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.score-hero {
  display: grid;
  grid-template-columns: minmax(220px, .8fr) auto 1.25fr;
  gap: 26px;
  align-items: center;
  padding: 26px;
}

.score-main span,
.card-head span {
  display: block;
  color: var(--text-muted);
  font-size: .76rem;
  font-weight: 900;
  text-transform: uppercase;
}

.score-main strong {
  display: block;
  margin: 8px 0;
  font-family: "JetBrains Mono", monospace;
  font-size: clamp(2.2rem, 6vw, 4.2rem);
  line-height: 1;
  color: var(--primary);
}

.score-main em {
  display: inline-flex;
  min-height: 34px;
  align-items: center;
  padding: 7px 12px;
  border-radius: 999px;
  background: #f1eee7;
  color: var(--text-muted);
  font-style: normal;
  font-weight: 800;
}

.score-main em.success { background: rgba(15, 159, 110, .12); color: var(--success); }
.score-main em.danger { background: rgba(220, 38, 38, .12); color: var(--danger); }

.score-ring {
  position: relative;
  width: 142px;
  height: 142px;
  display: grid;
  place-items: center;
}

.score-ring svg {
  width: 142px;
  height: 142px;
  transform: rotate(-90deg);
}

.ring-bg,
.ring-fill {
  fill: none;
  stroke-width: 11;
}

.ring-bg { stroke: #eee7dc; }
.ring-fill {
  stroke: var(--accent);
  stroke-linecap: round;
  stroke-dasharray: 326.73;
  stroke-dashoffset: 326.73;
  transition: stroke-dashoffset .35s ease, stroke .2s ease;
}

.score-ring span {
  position: absolute;
  font-family: "JetBrains Mono", monospace;
  font-weight: 900;
  color: var(--primary-dark);
}

.score-facts {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.score-facts article,
.analysis-list article {
  min-height: 86px;
  border: 1px solid var(--border);
  border-radius: 13px;
  padding: 16px;
  background: #fbfaf7;
}

.score-facts span,
.analysis-list span {
  display: block;
  color: var(--text-muted);
  font-weight: 800;
  font-size: .78rem;
}

.score-facts strong,
.analysis-list strong {
  display: block;
  margin-top: 6px;
  font-family: "JetBrains Mono", monospace;
  font-size: 1.6rem;
  color: var(--primary-dark);
}

.target-panel {
  display: flex;
  align-items: end;
  gap: 14px;
  flex-wrap: wrap;
  margin: 20px 0;
  padding: 18px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, .72);
}

.target-item {
  display: grid;
  gap: 7px;
}

label {
  font-weight: 900;
  font-size: .78rem;
  color: var(--text-muted);
  text-transform: uppercase;
}

input {
  height: 44px;
  width: 150px;
  border: 2px solid var(--border);
  border-radius: 10px;
  padding: 0 12px;
  font: 800 1rem "JetBrains Mono", monospace;
  color: var(--text);
  outline: none;
}

input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(15, 118, 110, .12);
}

.preset-row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-left: auto;
}

button {
  font: inherit;
  cursor: pointer;
}

.preset-row button {
  height: 44px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: #fff;
  color: var(--primary-dark);
  font-weight: 900;
  padding: 0 15px;
}

.preset-row button:hover {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

.calc-grid {
  display: grid;
  grid-template-columns: 1.35fr .75fr;
  gap: 22px;
  align-items: start;
}

.subjects-card,
.analysis-card { padding: 24px; }

.card-head h2 {
  margin: 6px 0 20px;
  color: var(--primary-dark);
  font-size: 1.35rem;
}

.subject-table {
  display: grid;
  gap: 10px;
}

.subject-row {
  display: grid;
  grid-template-columns: minmax(190px, 1.5fr) 70px 1fr 1fr 70px;
  gap: 10px;
  align-items: center;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: #fff;
}

.subject-name {
  min-width: 0;
}

.subject-name strong {
  display: block;
  color: var(--text);
  font-size: .95rem;
}

.subject-name span {
  display: block;
  color: var(--text-muted);
  font-size: .78rem;
  margin-top: 3px;
}

.q-pill {
  justify-self: start;
  padding: 7px 10px;
  border-radius: 999px;
  background: rgba(124, 63, 18, .1);
  color: var(--primary);
  font: 900 .88rem "JetBrains Mono", monospace;
}

.field {
  display: grid;
  gap: 5px;
}

.field input {
  width: 100%;
  height: 40px;
}

.blank-box {
  display: grid;
  place-items: center;
  height: 40px;
  border-radius: 10px;
  background: #f1eee7;
  color: var(--text-muted);
  font: 900 .95rem "JetBrains Mono", monospace;
}

.analysis-list {
  display: grid;
  gap: 12px;
}

.analysis-note {
  margin: 18px 0;
  color: var(--text-muted);
  line-height: 1.65;
}

.formula-note {
  padding: 14px;
  border-radius: 12px;
  border: 1px dashed rgba(15, 118, 110, .35);
  background: rgba(15, 118, 110, .06);
  color: var(--text-muted);
  font-size: .88rem;
  line-height: 1.6;
}

.formula-note strong { color: var(--accent); }

.action-links {
  display: grid;
  gap: 10px;
  margin-top: 18px;
}

.action-links a {
  text-align: center;
  text-decoration: none;
  font-weight: 900;
  border-radius: 12px;
  padding: 12px 14px;
  background: var(--primary-dark);
  color: #fff;
}

.action-links a + a {
  background: #fff;
  color: var(--primary-dark);
  border: 1px solid var(--border);
}

.site-footer {
  text-align: center;
  padding: 28px 18px 42px;
  color: var(--text-muted);
  font-size: .9rem;
}

@media (max-width: 980px) {
  .score-hero,
  .calc-grid {
    grid-template-columns: 1fr;
  }
  .score-ring {
    justify-self: start;
  }
}

@media (max-width: 760px) {
  .nav-links {
    position: absolute;
    top: 66px;
    left: 16px;
    right: 16px;
    display: none;
    flex-direction: column;
    padding: 12px;
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 14px;
    box-shadow: var(--shadow);
  }
  .nav-links.open { display: flex; }
  .hamburger { display: block; }
  .hero { padding-top: 42px; }
  .score-facts {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .subject-row {
    grid-template-columns: 1fr 64px;
  }
  .subject-row .field {
    grid-column: 1 / -1;
  }
  .blank-box {
    grid-column: 2;
    grid-row: 2;
  }
  input { width: 100%; }
  .target-panel { align-items: stretch; }
  .preset-row { margin-left: 0; }
}