/* ============================================================
   CORNETA Engineering Tools — Design System
   Тёмная индустриальная тема (единый стиль с /game/)
   ============================================================ */

/* ── Google Fonts ──────────────────────────────────────── */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=JetBrains+Mono:wght@400;600&display=swap');

/* ── Variables ─────────────────────────────────────────── */
:root {
  --bg-deepest:  #050810;
  --bg-primary:  #0a0f1a;
  --bg-card:     rgba(12, 18, 32, 0.88);
  --bg-card-hover: rgba(18, 26, 46, 0.92);
  --bg-overlay:  rgba(4, 6, 12, 0.85);
  --bg-input:    rgba(8, 14, 28, 0.9);

  --border-subtle:  rgba(0, 200, 255, 0.08);
  --border-card:    rgba(0, 200, 255, 0.15);
  --border-glow:    rgba(0, 200, 255, 0.3);
  --border-input:   rgba(0, 200, 255, 0.2);
  --border-focus:   rgba(0, 200, 255, 0.5);

  --text-primary:   #e4eaf4;
  --text-secondary: #7c869a;
  --text-muted:     #4a5268;

  --accent-cyan:    #00c8ff;
  --accent-blue:    #3b82f6;
  --accent-green:   #00ff88;
  --accent-amber:   #ffaa00;
  --accent-red:     #ff4466;
  --accent-purple:  #a855f7;
  --accent-orange:  #ff6b35;

  --success-bg:  rgba(0, 255, 136, 0.08);
  --success-border: rgba(0, 255, 136, 0.3);
  --warning-bg:  rgba(255, 170, 0, 0.08);
  --warning-border: rgba(255, 170, 0, 0.3);

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;

  --shadow-card: 0 8px 32px rgba(0,0,0,0.4), 0 2px 8px rgba(0,0,0,0.3);
  --shadow-glow: 0 0 30px rgba(0, 200, 255, 0.1);
  --shadow-input: 0 2px 8px rgba(0,0,0,0.3);

  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font-body: 'Inter', -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
}

/* ── Reset & Base ──────────────────────────────────────── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  background: var(--bg-deepest);
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
  line-height: 1.65;
}

/* Фоновая сетка */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  background:
    linear-gradient(rgba(0,200,255,0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,200,255,0.02) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none;
  z-index: 0;
}

/* Градиентное свечение сверху */
body::after {
  content: "";
  position: fixed;
  top: -200px;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 500px;
  background: radial-gradient(ellipse, rgba(0,200,255,0.06) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}

a {
  color: var(--accent-cyan);
  text-decoration: none;
  transition: var(--transition);
}
a:hover {
  color: #66dfff;
  text-decoration: underline;
}

/* ── PAGE CONTAINER ────────────────────────────────────── */
.tools-container {
  position: relative;
  z-index: 1;
  max-width: 900px;
  margin: 0 auto;
  padding: 1.5rem 1rem 3rem;
}
/* WATERMARK */
.tools-container::after {
  content: "CORNETA.TECH";
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) rotate(-30deg);
  font-size: min(12vw, 150px);
  font-weight: 900;
  color: rgba(255, 255, 255, 0.025);
  pointer-events: none;
  z-index: -1;
  white-space: nowrap;
}

/* ── BREADCRUMB ────────────────────────────────────────── */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}
.breadcrumb a {
  color: var(--text-secondary);
  font-weight: 500;
}
.breadcrumb a:hover {
  color: var(--accent-cyan);
  text-decoration: none;
}
.breadcrumb .sep {
  color: var(--text-muted);
  font-size: 0.7rem;
}
.breadcrumb .current {
  color: var(--text-primary);
  font-weight: 600;
}

/* ── HEADER ────────────────────────────────────────────── */
.tools-header {
  text-align: center;
  margin-bottom: 2.5rem;
}

.tools-badge {
  display: inline-block;
  padding: 0.35rem 1rem;
  border-radius: 100px;
  background: rgba(0, 200, 255, 0.1);
  border: 1px solid rgba(0, 200, 255, 0.25);
  color: var(--accent-cyan);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 1rem;
}

.tools-title {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 900;
  line-height: 1.15;
  margin-bottom: 0.75rem;
  background: linear-gradient(135deg, #ffffff 0%, var(--accent-cyan) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.tools-subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

/* ── TOOL CARDS (Hub Page) ─────────────────────────────── */
.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.2rem;
  margin-bottom: 2rem;
}

.tool-card {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 1.8rem;
  box-shadow: var(--shadow-card);
  backdrop-filter: blur(12px);
  transition: var(--transition);
  cursor: pointer;
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}
.tool-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent-cyan), var(--accent-blue));
  opacity: 0;
  transition: var(--transition);
}
.tool-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-glow);
  box-shadow: var(--shadow-card), var(--shadow-glow);
}
.tool-card:hover::before {
  opacity: 1;
}

.tool-card-icon {
  font-size: 2.5rem;
  margin-bottom: 0.75rem;
}

.tool-card-title {
  font-size: 1.15rem;
  font-weight: 800;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.tool-card-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.6;
  flex: 1;
  margin-bottom: 1rem;
}

.tool-card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}
.tool-tag {
  display: inline-block;
  padding: 0.2rem 0.6rem;
  border-radius: 100px;
  font-size: 0.72rem;
  font-weight: 600;
  background: rgba(0, 200, 255, 0.08);
  border: 1px solid rgba(0, 200, 255, 0.15);
  color: var(--accent-cyan);
}
.tool-tag-new {
  background: rgba(0, 255, 136, 0.1);
  border-color: rgba(0, 255, 136, 0.25);
  color: var(--accent-green);
}
.tool-tag-soon {
  background: rgba(255, 170, 0, 0.08);
  border-color: rgba(255, 170, 0, 0.2);
  color: var(--accent-amber);
}

.tool-card-arrow {
  position: absolute;
  top: 1.5rem;
  right: 1.5rem;
  font-size: 1.2rem;
  color: var(--text-muted);
  transition: var(--transition);
}
.tool-card:hover .tool-card-arrow {
  color: var(--accent-cyan);
  transform: translateX(4px);
}

/* ── CALCULATOR LAYOUT ─────────────────────────────────── */
.calc-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  backdrop-filter: blur(12px);
  padding: 2rem;
  margin-bottom: 1.5rem;
  animation: card-enter 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}
@keyframes card-enter {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.calc-card-title {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.calc-card-title .icon {
  font-size: 1.2rem;
}

/* ── FORM CONTROLS ─────────────────────────────────────── */
.form-group {
  margin-bottom: 1.2rem;
}

.form-label {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
}

.form-label .hint {
  font-weight: 400;
  color: var(--text-muted);
  font-size: 0.78rem;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}
@media (max-width: 500px) {
  .form-row {
    grid-template-columns: 1fr;
  }
}

.form-input,
.form-select {
  width: 100%;
  padding: 0.8rem 1rem;
  font-family: var(--font-mono);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
  background: var(--bg-input);
  border: 1px solid var(--border-input);
  border-radius: var(--radius-sm);
  outline: none;
  transition: var(--transition);
  box-shadow: var(--shadow-input);
  -moz-appearance: textfield;
}
.form-input::placeholder {
  color: var(--text-muted);
  font-weight: 400;
}
.form-input:focus,
.form-select:focus {
  border-color: var(--border-focus);
  box-shadow: var(--shadow-input), 0 0 0 3px rgba(0, 200, 255, 0.08);
}
.form-input::-webkit-outer-spin-button,
.form-input::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

.form-select {
  font-family: var(--font-body);
  cursor: pointer;
  -webkit-appearance: none;
  -moz-appearance: none;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%237c869a' stroke-width='2' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 1rem center;
  padding-right: 2.5rem;
}
.form-select option {
  background: #0a0f1a;
  color: var(--text-primary);
}

.form-input-with-unit {
  position: relative;
}
.form-input-with-unit .form-input {
  padding-right: 3.5rem;
}
.form-input-with-unit .unit {
  position: absolute;
  right: 1rem;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  pointer-events: none;
}

/* Radio Group (visual buttons) */
.radio-group {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}
.radio-option {
  flex: 1;
  min-width: 120px;
}
.radio-option input {
  display: none;
}
.radio-option label {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.3rem;
  padding: 0.8rem 0.6rem;
  border-radius: var(--radius-sm);
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--border-subtle);
  cursor: pointer;
  transition: var(--transition);
  text-align: center;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
}
.radio-option label:hover {
  background: rgba(0, 200, 255, 0.04);
  border-color: var(--border-card);
}
.radio-option input:checked + label {
  background: rgba(0, 200, 255, 0.08);
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
  font-weight: 600;
  box-shadow: 0 0 16px rgba(0, 200, 255, 0.08);
}
.radio-option label .radio-icon {
  font-size: 1.3rem;
}
.radio-option label .radio-sub {
  font-size: 0.72rem;
  color: var(--text-muted);
  font-weight: 400;
}

/* ── CALCULATE BUTTON ──────────────────────────────────── */
.btn-calculate {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  width: 100%;
  padding: 1rem 2rem;
  font-family: var(--font-body);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--bg-deepest);
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: var(--transition);
  box-shadow: 0 4px 20px rgba(0, 200, 255, 0.3);
  margin-top: 0.5rem;
}
.btn-calculate:hover {
  transform: translateY(-2px) scale(1.01);
  box-shadow: 0 8px 30px rgba(0, 200, 255, 0.45);
}
.btn-calculate:active {
  transform: scale(0.98);
}

/* ── RESULTS PANEL ─────────────────────────────────────── */
.results-panel {
  display: none;
  animation: card-enter 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}
.results-panel.active {
  display: block;
}

.result-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 0.8rem;
  margin-bottom: 1.2rem;
}

.result-item {
  padding: 1rem;
  border-radius: var(--radius-sm);
  background: rgba(255,255,255,0.02);
  border: 1px solid var(--border-subtle);
  text-align: center;
  transition: var(--transition);
}
.result-item:hover {
  border-color: var(--border-card);
  background: rgba(0,200,255,0.03);
}

.result-label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 0.4rem;
}

.result-value {
  font-family: var(--font-mono);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--accent-cyan);
}
.result-value .result-unit {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-left: 0.2rem;
}

.result-item-highlight {
  border-color: var(--accent-cyan);
  background: rgba(0, 200, 255, 0.06);
  box-shadow: 0 0 20px rgba(0, 200, 255, 0.06);
}

/* Result recommendation */
.result-recommendation {
  padding: 1.2rem;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, rgba(0,255,136,0.06), rgba(0,200,255,0.04));
  border: 1px solid rgba(0, 255, 136, 0.2);
  margin-bottom: 1rem;
}
.result-recommendation h4 {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--accent-green);
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}
.result-recommendation p {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Product link cards */
.product-links {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 0.8rem;
}

.product-link {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  padding: 0.8rem 1rem;
  border-radius: var(--radius-sm);
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--border-subtle);
  text-decoration: none;
  color: var(--text-primary);
  transition: var(--transition);
}
.product-link:hover {
  background: rgba(0,200,255,0.05);
  border-color: var(--border-glow);
  transform: translateX(4px);
  text-decoration: none;
}
.product-link .pl-icon {
  font-size: 1.5rem;
}
.product-link .pl-info {
  flex: 1;
}
.product-link .pl-name {
  font-size: 0.85rem;
  font-weight: 600;
}
.product-link .pl-sub {
  font-size: 0.75rem;
  color: var(--text-muted);
}
.product-link .pl-arrow {
  color: var(--text-muted);
  transition: var(--transition);
}
.product-link:hover .pl-arrow {
  color: var(--accent-cyan);
}

/* ── INFO BLOCK ────────────────────────────────────────── */
.info-block {
  padding: 1rem 1.2rem;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  line-height: 1.65;
  color: var(--text-secondary);
  margin-bottom: 1rem;
}
.info-block-tip {
  background: rgba(0, 200, 255, 0.05);
  border: 1px solid rgba(0, 200, 255, 0.12);
  border-left: 3px solid var(--accent-cyan);
}
.info-block-warning {
  background: rgba(255, 170, 0, 0.05);
  border: 1px solid rgba(255, 170, 0, 0.12);
  border-left: 3px solid var(--accent-amber);
}
.info-block strong {
  color: var(--text-primary);
}

/* ── FORMULA DISPLAY ───────────────────────────────────── */
.formula-block {
  padding: 1rem 1.2rem;
  border-radius: var(--radius-sm);
  background: rgba(0,0,0,0.3);
  border: 1px solid var(--border-subtle);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--accent-cyan);
  text-align: center;
  margin-bottom: 1rem;
  letter-spacing: 0.02em;
}
.formula-block .formula-desc {
  font-family: var(--font-body);
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: 0.4rem;
  letter-spacing: 0;
}

/* ── FOOTER ────────────────────────────────────────────── */
.tools-footer {
  text-align: center;
  padding: 2rem 1rem;
  font-size: 0.8rem;
  color: var(--text-muted);
}
.tools-footer a {
  color: var(--text-secondary);
}

/* ── CROSS LINKS ───────────────────────────────────────── */
.cross-links {
  margin-top: 0.5rem;
}
.cross-links h3 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-secondary);
  margin-bottom: 0.8rem;
}

/* ── ANIMATIONS ────────────────────────────────────────── */
@keyframes pulse-value {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}
.result-pulse {
  animation: pulse-value 0.6s ease;
}

@keyframes countUp {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}
.count-up {
  animation: countUp 0.5s ease forwards;
}

/* ── RESPONSIVE ────────────────────────────────────────── */
@media (max-width: 768px) {
  .tools-container {
    padding: 1rem 0.75rem 2rem;
  }
  .calc-card {
    padding: 1.5rem 1rem;
  }
  .result-grid {
    grid-template-columns: 1fr 1fr;
  }
  .tool-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 400px) {
  .result-grid {
    grid-template-columns: 1fr;
  }
  .radio-group {
    flex-direction: column;
  }
  .radio-option {
    min-width: 100%;
  }
}