/* ═══════════════════════════════════════════════
   AdMatic — Design System (VC.ru Dark)
   ═══════════════════════════════════════════════ */

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

:root {
  --color-bg: #0a0a0b;
  --color-bg-alt: #121214;
  --color-surface: #18181b;
  --color-surface-hover: #1f1f23;
  --color-surface-active: #27272a;
  --color-primary: #3b82f6;
  --color-primary-hover: #60a5fa;
  --color-primary-muted: rgba(59, 130, 246, 0.15);
  --color-primary-light: rgba(59, 130, 246, 0.1);
  --color-accent: #06b6d4;
  --color-text: #e4e4e7;
  --color-text-secondary: #a1a1aa;
  --color-text-tertiary: #71717a;
  --color-border: #27272a;
  --color-border-light: #1f1f23;
  --color-success: #22c55e;
  --color-success-bg: rgba(34, 197, 94, 0.1);
  --color-error: #ef4444;
  --color-error-bg: rgba(239, 68, 68, 0.1);
  --color-warning: #f59e0b;
  --color-warning-bg: rgba(245, 158, 11, 0.1);

  --font-family: 'Roboto', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-xl: 20px;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.4);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.5);
  --shadow-glow: 0 0 20px rgba(59, 130, 246, 0.15);

  --nav-height: 56px;
  --max-width: 1100px;
  --content-padding: 24px;
  --transition-fast: 0.15s ease;
  --transition-base: 0.2s ease;
  --transition-slow: 0.3s ease;
}

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

body {
  font-family: var(--font-family);
  font-weight: 400;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

::selection {
  background: var(--color-primary-muted);
  color: var(--color-primary-hover);
}

/* ── Scrollbar ────────────────────────────────── */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--color-text-tertiary);
}

/* ── Typography ───────────────────────────────── */
h1 { font-size: 1.75rem; font-weight: 700; line-height: 1.25; letter-spacing: -0.02em; }
h2 { font-size: 1.375rem; font-weight: 600; line-height: 1.3; }
h3 { font-size: 1.125rem; font-weight: 600; }
p  { margin-bottom: 1rem; color: var(--color-text-secondary); }
a  { color: var(--color-primary); text-decoration: none; transition: color var(--transition-fast); }
a:hover { color: var(--color-primary-hover); text-decoration: none; }

/* ── Layout ───────────────────────────────────── */
.main-content {
  flex: 1;
  max-width: var(--max-width);
  width: 100%;
  margin: 0 auto;
  padding: calc(var(--nav-height) + 32px) var(--content-padding) 48px;
}

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

/* ── Navbar ────────────────────────────────────── */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: rgba(10, 10, 11, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-border);
  z-index: 100;
}

.navbar__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--content-padding);
  height: 100%;
  display: flex;
  align-items: center;
  gap: 24px;
}

.navbar__brand {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-text) !important;
  letter-spacing: -0.02em;
  white-space: nowrap;
}

.navbar__nav {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
  margin: 0;
  padding: 0;
  height: 100%;
}

.navbar__link {
  display: flex;
  align-items: center;
  height: 100%;
  padding: 0 12px;
  font-size: 0.875rem;
  font-weight: 400;
  color: var(--color-text-secondary) !important;
  border-bottom: 2px solid transparent;
  transition: color var(--transition-fast), border-color var(--transition-fast);
}
.navbar__link:hover {
  color: var(--color-text) !important;
  border-bottom-color: var(--color-primary);
  text-decoration: none;
}

/* ── Dropdown ─────────────────────────────────── */
.navbar__dropdown {
  position: relative;
  height: 100%;
  display: flex;
  align-items: center;
}

.navbar__dropdown-toggle {
  display: flex;
  align-items: center;
  gap: 4px;
  height: 100%;
  padding: 0 12px;
  font-size: 0.875rem;
  font-weight: 400;
  color: var(--color-text-secondary);
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  cursor: pointer;
  font-family: var(--font-family);
  transition: color var(--transition-fast), border-color var(--transition-fast);
}
.navbar__dropdown-toggle:hover {
  color: var(--color-text);
  border-bottom-color: var(--color-primary);
}

.navbar__dropdown-menu {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 220px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  padding: 6px;
  z-index: 101;
}
.navbar__dropdown:hover .navbar__dropdown-menu,
.navbar__dropdown-menu.show {
  display: block;
}

.navbar__dropdown-item {
  display: block;
  padding: 8px 12px;
  font-size: 0.8125rem;
  color: var(--color-text-secondary) !important;
  border-radius: var(--radius-sm);
  transition: background var(--transition-fast), color var(--transition-fast);
}
.navbar__dropdown-item:hover {
  background: var(--color-surface-hover);
  color: var(--color-text) !important;
  text-decoration: none;
}

.navbar__dropdown-divider {
  height: 1px;
  background: var(--color-border);
  margin: 4px 8px;
}

/* ── Navbar spacing ────────────────────────────── */
.navbar__spacer {
  flex: 1;
}

/* ── Lang switcher ─────────────────────────────── */
.navbar__lang-btn {
  padding: 4px 10px;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--color-text-tertiary);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-family: var(--font-family);
  transition: all var(--transition-fast);
}
.navbar__lang-btn:hover {
  color: var(--color-text);
  border-color: var(--color-primary);
  background: var(--color-primary-muted);
}

/* ── Navbar toggle (mobile) ────────────────────── */
.navbar__toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  padding: 8px;
  background: none;
  border: none;
  cursor: pointer;
}
.navbar__toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--color-text);
  border-radius: 1px;
  transition: transform var(--transition-base);
}

/* ── Footer ────────────────────────────────────── */
.footer {
  border-top: 1px solid var(--color-border);
  padding: 24px var(--content-padding);
  margin-top: auto;
}
.footer__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8125rem;
  color: var(--color-text-tertiary);
}
.footer__links {
  display: flex;
  gap: 16px;
}
.footer__links a {
  color: var(--color-text-tertiary) !important;
  transition: color var(--transition-fast);
}
.footer__links a:hover {
  color: var(--color-text) !important;
}

/* ── Cards ────────────────────────────────────── */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px;
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.card--hover:hover {
  border-color: var(--color-border-light);
  box-shadow: var(--shadow-md);
}

/* ── Tool cards (homepage grid) ────────────────── */
.tool-card {
  display: flex;
  flex-direction: column;
  padding: 20px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  text-decoration: none !important;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}
.tool-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--color-primary);
  opacity: 0;
  transition: opacity var(--transition-base);
}
.tool-card:hover {
  border-color: var(--color-primary-muted);
  box-shadow: var(--shadow-glow);
  transform: translateY(-2px);
}
.tool-card:hover::before {
  opacity: 1;
}
.tool-card__icon {
  font-size: 1.5rem;
  margin-bottom: 10px;
}
.tool-card__title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 4px;
}
.tool-card__desc {
  font-size: 0.8125rem;
  color: var(--color-text-tertiary);
  line-height: 1.5;
  flex: 1;
}
.tool-card__link {
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--color-primary);
  margin-top: 12px;
  transition: color var(--transition-fast);
}
.tool-card:hover .tool-card__link {
  color: var(--color-primary-hover);
}

/* ── Buttons ──────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 8px 18px;
  border-radius: var(--radius-sm);
  font-family: var(--font-family);
  font-size: 0.875rem;
  font-weight: 500;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
  line-height: 1.4;
  white-space: nowrap;
}

.btn--primary {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}
.btn--primary:hover {
  background: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
  text-decoration: none;
  box-shadow: var(--shadow-glow);
  color: #fff;
}

.btn--secondary {
  background: transparent;
  color: var(--color-text-secondary);
  border-color: var(--color-border);
}
.btn--secondary:hover {
  background: var(--color-surface-hover);
  border-color: var(--color-border);
  color: var(--color-text);
  text-decoration: none;
}

.btn--sm {
  padding: 5px 12px;
  font-size: 0.8rem;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

/* ── Forms ─────────────────────────────────────── */
.form-group {
  margin-bottom: 16px;
}

.form-group label {
  display: block;
  font-size: 0.8125rem;
  font-weight: 500;
  margin-bottom: 6px;
  color: var(--color-text);
}

.form-input,
.form-textarea,
.form-select {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-family: var(--font-family);
  font-size: 0.875rem;
  background: var(--color-bg-alt);
  color: var(--color-text);
  transition: all var(--transition-base);
  outline: none;
}

.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--color-text-tertiary);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
  border-color: var(--color-primary);
  background: var(--color-surface);
  box-shadow: 0 0 0 3px var(--color-primary-light);
}

.form-select {
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23a1a1aa' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 32px;
}

.form-textarea {
  resize: vertical;
  min-height: 100px;
}

/* ── Grid ──────────────────────────────────────── */
.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 12px;
}

/* ── Badges ────────────────────────────────────── */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: 4px;
}

/* ── Error page ────────────────────────────────── */
.error-page {
  text-align: center;
  padding: 80px 24px;
}
.error-page h1 {
  font-size: 4rem;
  color: var(--color-primary);
  margin-bottom: 8px;
}
.error-page p {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  margin-bottom: 24px;
}
.error-detail {
  background: var(--color-error-bg);
  color: var(--color-error);
  padding: 12px;
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  max-width: 500px;
  margin: 0 auto 24px;
  text-align: left;
  overflow-x: auto;
}

/* ── Tool widget (tool pages) ──────────────────── */
.tool-widget {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-bottom: 16px;
}
.tool-widget__row {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}
.tool-widget__row .form-group {
  flex: 1;
  min-width: 140px;
}

/* ── Result boxes ──────────────────────────────── */
.result-box {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 16px;
  font-size: 0.875rem;
  line-height: 1.6;
  word-break: break-all;
  white-space: pre-wrap;
  min-height: 40px;
}
.result-box--success {
  background: var(--color-success-bg);
  border-color: var(--color-success);
  color: var(--color-success);
}
.result-box--error {
  background: var(--color-error-bg);
  border-color: var(--color-error);
  color: var(--color-error);
}

/* ── Hero ──────────────────────────────────────── */
.hero {
  text-align: center;
  padding: 40px 0 36px;
}
.hero h1 {
  font-size: 2rem;
  margin-bottom: 8px;
}
.hero__sub {
  color: var(--color-text-secondary);
  font-size: 1rem;
  max-width: 520px;
  margin: 0 auto;
}

/* ── Tool category section ─────────────────────── */
.tool-category {
  margin-bottom: 36px;
}
.tool-category h2 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 14px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text);
}

/* ── Info pages ────────────────────────────────── */
.info-page {
  max-width: 720px;
  margin: 0 auto;
}
.info-page h1 {
  margin-bottom: 16px;
}
.info-page h2 {
  margin-top: 28px;
  margin-bottom: 8px;
  font-size: 1.125rem;
}
.info-page ul {
  padding-left: 20px;
  margin-bottom: 16px;
}
.info-page li {
  margin-bottom: 4px;
  color: var(--color-text-secondary);
  font-size: 0.875rem;
}

/* ── Guide table ───────────────────────────────── */
.guide-table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 24px;
}
.guide-table th,
.guide-table td {
  padding: 8px 12px;
  text-align: left;
  border-bottom: 1px solid var(--color-border);
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}
.guide-table th {
  background: var(--color-bg-alt);
  font-weight: 600;
  color: var(--color-text);
}

/* ── Glossary (Dictionary) ─────────────────────── */
.glossary {
  max-width: 720px;
  margin: 0 auto;
}
.glossary__title {
  margin-bottom: 8px;
}
.glossary__intro {
  color: var(--color-text-secondary);
  font-size: 0.95rem;
  margin-bottom: 28px;
}

.glossary-term {
  border-bottom: 1px solid var(--color-border);
  transition: border-color var(--transition-base);
}
.glossary-term:first-of-type {
  border-top: 1px solid var(--color-border);
}
.glossary-term[open] {
  border-bottom-color: var(--color-primary-muted);
}

.glossary-term__header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 0;
  cursor: pointer;
  list-style: none;
  user-select: none;
  transition: opacity var(--transition-fast);
}
.glossary-term__header::-webkit-details-marker {
  display: none;
}
.glossary-term__header:hover {
  opacity: 0.8;
}

.glossary-term__abbr {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 60px;
  padding: 4px 10px;
  font-size: 0.75rem;
  font-weight: 700;
  font-family: 'SF Mono', 'Fira Code', monospace;
  letter-spacing: 0.05em;
  color: var(--color-primary);
  background: var(--color-primary-muted);
  border-radius: var(--radius-sm);
}
.glossary-term__brief {
  flex: 1;
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  line-height: 1.4;
}
.glossary-term__chevron {
  font-size: 0.7rem;
  color: var(--color-text-tertiary);
  transition: transform var(--transition-base);
}
.glossary-term[open] .glossary-term__chevron {
  transform: rotate(180deg);
}

.glossary-term__body {
  padding: 0 0 16px 72px;
}
.glossary-term__desc {
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--color-text-secondary);
}
.glossary-examples-heading {
  display: block;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-text-tertiary);
  margin: 14px 0 8px;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}
.glossary-term__examples ul {
  list-style: none;
  padding: 0;
}
.glossary-term__examples li {
  position: relative;
  padding: 8px 12px;
  margin-bottom: 6px;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
}
.glossary-term__examples li::before {
  content: '→';
  color: var(--color-primary);
  font-weight: 600;
  margin-right: 8px;
}

/* ── Short URL display ─────────────────────────── */
.short-url-display {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}
.short-url-display span {
  flex: 1;
  padding: 8px 12px;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  word-break: break-all;
}

/* ── CC stats ──────────────────────────────────── */
.cc-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.cc-stat {
  flex: 1;
  min-width: 90px;
  text-align: center;
  padding: 14px 12px;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  transition: border-color var(--transition-base);
}
.cc-stat:hover {
  border-color: var(--color-primary-muted);
}
.cc-stat__value {
  display: block;
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--color-primary);
}
.cc-stat__label {
  display: block;
  font-size: 0.7rem;
  color: var(--color-text-tertiary);
  margin-top: 2px;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

/* ── Image preview ─────────────────────────────── */
.img-preview {
  max-width: 100%;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  display: block;
  margin-top: 12px;
}

/* ── Responsive ────────────────────────────────── */
@media (max-width: 768px) {
  :root { --content-padding: 16px; }

  h1 { font-size: 1.375rem; }
  .hero h1 { font-size: 1.5rem; }

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

  .navbar__nav { display: none; }
  .navbar__toggle { display: flex; }

  .navbar__nav.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: 8px 0;
    height: auto;
    gap: 0;
  }
  .navbar__nav.open .navbar__link,
  .navbar__nav.open .navbar__dropdown-toggle {
    height: auto;
    padding: 10px var(--content-padding);
    border-bottom: none;
  }
  .navbar__nav.open .navbar__dropdown {
    height: auto;
  }
  .navbar__nav.open .navbar__dropdown-menu {
    position: static;
    box-shadow: none;
    border: none;
    border-radius: 0;
    padding-left: var(--content-padding);
  }
  .navbar__nav.open .navbar__lang-btn {
    margin: 8px var(--content-padding);
  }

  .tool-widget__row { flex-direction: column; }
  .tool-widget__row .form-group { min-width: auto; }

  .footer__inner {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }

  .glossary-term__body {
    padding-left: 0;
  }
  .glossary-term__abbr {
    min-width: 48px;
    font-size: 0.7rem;
  }
}