/* ===== Переменные темы ===== */
:root {
  --bg: #0b0b12;
  --bg-soft: #14141f;
  --card: #181826;
  --border: #262636;
  --text: #e8e8f0;
  --muted: #9a9ab0;
  --accent: #6366f1;
  --accent-soft: #4f46e5;
  --green: #22c55e;
  --red: #ef4444;
  --radius: 14px;
  --maxw: 960px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: "Inter", system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }

.container { max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }

/* ===== Навигация ===== */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(11, 11, 18, 0.7);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.nav__inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.nav__logo { font-weight: 800; font-size: 20px; color: var(--accent); letter-spacing: -0.5px; }
.nav__links { display: flex; align-items: center; gap: 28px; }
.nav__links a { color: var(--muted); font-size: 15px; transition: color 0.2s; }
.nav__links a:hover { color: var(--text); }
.nav__cta {
  background: var(--accent-soft);
  color: #fff !important;
  padding: 8px 16px;
  border-radius: 10px;
}
.nav__cta:hover { background: var(--accent); }

/* ===== Hero ===== */
.hero { position: relative; overflow: hidden; padding: 110px 0 90px; }
.hero__inner { position: relative; z-index: 2; text-align: center; }
.hero__badge {
  display: inline-block;
  color: var(--green);
  background: rgba(34, 197, 94, 0.1);
  border: 1px solid rgba(34, 197, 94, 0.25);
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 13px;
  margin-bottom: 24px;
}
.hero__title {
  font-size: clamp(40px, 7vw, 72px);
  font-weight: 800;
  letter-spacing: -2px;
  line-height: 1.05;
  background: linear-gradient(135deg, #fff 30%, #a5b4fc);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero__subtitle {
  max-width: 560px;
  margin: 22px auto 0;
  color: var(--muted);
  font-size: 18px;
}
.hero__actions { display: flex; gap: 14px; justify-content: center; margin-top: 36px; flex-wrap: wrap; }
.hero__glow {
  position: absolute;
  top: -40%;
  left: 50%;
  transform: translateX(-50%);
  width: 700px;
  height: 700px;
  background: radial-gradient(circle, rgba(99, 102, 241, 0.18), transparent 60%);
  pointer-events: none;
}

/* ===== Кнопки ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: 15px;
  padding: 13px 24px;
  border-radius: 12px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.15s, background 0.2s, opacity 0.2s;
}
.btn:active { transform: translateY(1px); }
.btn--primary { background: var(--accent-soft); color: #fff; }
.btn--primary:hover { background: var(--accent); }
.btn--primary:disabled { opacity: 0.55; cursor: not-allowed; }
.btn--ghost { background: transparent; border-color: var(--border); color: var(--text); }
.btn--ghost:hover { border-color: var(--accent); }
.btn--block { width: 100%; margin-top: 8px; }

/* ===== Секции ===== */
.section { padding: 56px 0; border-top: 1px solid var(--border); }
.section__title { font-size: 28px; font-weight: 700; letter-spacing: -0.5px; margin-bottom: 18px; }
.section__lead { color: var(--muted); max-width: 640px; font-size: 17px; }

/* ===== Чипы стека ===== */
.chips { display: flex; flex-wrap: wrap; gap: 10px; }
.chip {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  padding: 8px 16px;
  border-radius: 999px;
  font-size: 14px;
  color: var(--text);
  transition: border-color 0.2s, transform 0.15s;
}
.chip:hover { border-color: var(--accent); transform: translateY(-2px); }

/* ===== Карточки проектов ===== */
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  transition: transform 0.2s, border-color 0.2s;
}
.card:hover { transform: translateY(-4px); border-color: var(--accent); }
.card__tag {
  display: inline-block;
  font-size: 12px;
  color: var(--accent);
  background: rgba(99, 102, 241, 0.12);
  padding: 4px 10px;
  border-radius: 8px;
  margin-bottom: 14px;
}
.card h3 { font-size: 18px; margin-bottom: 8px; }
.card p { color: var(--muted); font-size: 14px; }

/* ===== Форма ===== */
.form { margin-top: 28px; max-width: 640px; }
.form__row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form__group { margin-bottom: 18px; display: flex; flex-direction: column; }
.form__group label { font-size: 14px; color: var(--muted); margin-bottom: 7px; }
.form input,
.form textarea {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 14px;
  color: var(--text);
  font-family: inherit;
  font-size: 15px;
  transition: border-color 0.2s;
  resize: vertical;
}
.form input:focus,
.form textarea:focus { outline: none; border-color: var(--accent); }
.form input.invalid,
.form textarea.invalid { border-color: var(--red); }
.form__error { color: var(--red); font-size: 13px; margin-top: 6px; min-height: 16px; }

/* ===== Результат ===== */
.result {
  margin-top: 24px;
  max-width: 640px;
  background: var(--card);
  border: 1px solid var(--border);
  border-left: 3px solid var(--green);
  border-radius: var(--radius);
  padding: 20px 22px;
  animation: fade-in 0.35s ease;
}
.result__head { display: flex; align-items: center; gap: 10px; margin-bottom: 8px; }
.result__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  background: var(--green);
  color: #06210f;
  border-radius: 999px;
  font-weight: 800;
}
.result__title { font-weight: 700; font-size: 17px; }
.result__text { color: var(--muted); }

/* Режим ошибки: красная рамка и иконка */
.result--error { border-left-color: var(--red); }
.result--error .result__icon { background: var(--red); color: #2a0707; }
.result__analysis { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 16px; }
.tag {
  font-size: 13px;
  padding: 6px 12px;
  border-radius: 8px;
  background: var(--bg-soft);
  border: 1px solid var(--border);
}
.tag b { color: var(--text); }
.tag--pos { border-color: rgba(34, 197, 94, 0.4); }
.tag--neg { border-color: rgba(239, 68, 68, 0.4); }

/* ===== Footer ===== */
.footer { border-top: 1px solid var(--border); padding: 32px 0; color: var(--muted); font-size: 14px; text-align: center; }
.footer a { color: var(--accent); }

@keyframes fade-in {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ===== Адаптив ===== */
@media (max-width: 720px) {
  .nav__links { gap: 16px; }
  .nav__links a:not(.nav__cta) { display: none; }
  .cards { grid-template-columns: 1fr; }
  .form__row { grid-template-columns: 1fr; }
  .hero { padding: 80px 0 60px; }
}