/* ============================================================
   Claudia UI — corporate design language of ucloud.ua / u-ai.cloud.
   Brand blue #0050FF + orange #FF5400, ink-navy text, Inter.
   Two themes: light (default, on :root) and dark ([data-theme="dark"]).
   ============================================================ */

/* ----------------------------- tokens: light (default) */
:root {
  --cui-blue: #0050FF;
  --cui-blue-hover: #003DD4;
  --cui-blue-soft: #EEF3FF;
  --cui-blue-mid: #D6E4FF;
  --cui-blue-hi: #6B9FFF;

  --cui-orange: #FF5400;
  --cui-orange-hover: #E04800;
  --cui-orange-soft: #FFF0EA;

  --cui-green: #0FA968;
  --cui-green-soft: #E8F8F0;
  --cui-red: #E02D2D;
  --cui-red-soft: #FDEEEE;
  --cui-yellow: #D97706;
  --cui-yellow-soft: #FFF6E6;

  --cui-ink: #0C0C25;
  --cui-ink-2: #1A1A3A;
  --cui-text: #2D2D50;
  --cui-text-2: #6B6B8A;
  --cui-text-3: #9898B0;

  --cui-bg: #F8F9FC;
  --cui-bg-2: #F1F3F9;
  --cui-surface: #FFFFFF;
  --cui-surface-2: #F8F9FC;

  --cui-border: #E4E7F0;
  --cui-border-2: #D0D5E8;

  --cui-on-accent: #FFFFFF;
  --cui-inverse-bg: #0C0C25;
  --cui-inverse-text: #FFFFFF;

  --cui-shadow-sm: 0 1px 3px rgba(12, 12, 37, 0.06), 0 1px 2px rgba(12, 12, 37, 0.04);
  --cui-shadow-md: 0 4px 16px rgba(12, 12, 37, 0.08), 0 2px 6px rgba(12, 12, 37, 0.04);
  --cui-shadow-lg: 0 8px 32px rgba(12, 12, 37, 0.10), 0 4px 12px rgba(12, 12, 37, 0.06);
  --cui-shadow-xl: 0 16px 48px rgba(12, 12, 37, 0.12), 0 6px 18px rgba(12, 12, 37, 0.07);
  --cui-shadow-blue: 0 8px 28px rgba(0, 80, 255, 0.18), 0 2px 8px rgba(0, 80, 255, 0.10);

  --cui-r-sm: 8px;
  --cui-r: 14px;
  --cui-r-lg: 20px;
  --cui-r-full: 999px;

  --cui-font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

/* ----------------------------- tokens: dark */
[data-theme="dark"] {
  --cui-blue: #3D74FF;
  --cui-blue-hover: #6B9FFF;
  --cui-blue-soft: #141F45;
  --cui-blue-mid: #1D2C5E;
  --cui-blue-hi: #6B9FFF;

  --cui-orange: #FF6B20;
  --cui-orange-hover: #FF8A50;
  --cui-orange-soft: #33170A;

  --cui-green: #2BC98A;
  --cui-green-soft: #0D2B1F;
  --cui-red: #FF5C5C;
  --cui-red-soft: #331111;
  --cui-yellow: #F0A030;
  --cui-yellow-soft: #33260D;

  --cui-ink: #FFFFFF;
  --cui-ink-2: #E6E8F5;
  --cui-text: #C8CADF;
  --cui-text-2: #9092B3;
  --cui-text-3: #62648A;

  --cui-bg: #0A0A1C;
  --cui-bg-2: #0F0F26;
  --cui-surface: #14142E;
  --cui-surface-2: #1A1A3A;

  --cui-border: #24264A;
  --cui-border-2: #34376A;

  --cui-on-accent: #FFFFFF;
  --cui-inverse-bg: #FFFFFF;
  --cui-inverse-text: #0C0C25;

  --cui-shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.35), 0 1px 2px rgba(0, 0, 0, 0.25);
  --cui-shadow-md: 0 4px 16px rgba(0, 0, 0, 0.40), 0 2px 6px rgba(0, 0, 0, 0.28);
  --cui-shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.45), 0 4px 12px rgba(0, 0, 0, 0.30);
  --cui-shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.50), 0 6px 18px rgba(0, 0, 0, 0.32);
  --cui-shadow-blue: 0 8px 28px rgba(61, 116, 255, 0.30), 0 2px 8px rgba(61, 116, 255, 0.18);
}

/* ----------------------------- root wrapper */
.cui-root {
  font-family: var(--cui-font);
  background: var(--cui-bg);
  color: var(--cui-text);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

.cui-root *,
.cui-root *::before,
.cui-root *::after {
  box-sizing: border-box;
}

.cui-h1, .cui-h2, .cui-h3 {
  color: var(--cui-ink);
  letter-spacing: -0.03em;
  line-height: 1.12;
  margin: 0;
}
.cui-h1 { font-size: clamp(2.4rem, 4.5vw, 3.6rem); font-weight: 800; }
.cui-h2 { font-size: clamp(1.8rem, 3.5vw, 2.6rem); font-weight: 800; }
.cui-h3 { font-size: 1.25rem; font-weight: 700; letter-spacing: -0.01em; }
.cui-accent { color: var(--cui-blue); }
.cui-accent-hi { color: var(--cui-blue-hi); }

/* ----------------------------- Button */
.cui-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  font-family: var(--cui-font);
  font-size: 0.9rem;
  font-weight: 600;
  line-height: 1.2;
  padding: 0.7rem 1.5rem;
  border-radius: var(--cui-r);
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  white-space: nowrap;
  transition: background 0.18s, color 0.18s, border-color 0.18s, box-shadow 0.18s, transform 0.15s;
}
.cui-btn:hover { transform: translateY(-1px); }
.cui-btn:active { transform: translateY(0); }
.cui-btn:disabled, .cui-btn[aria-disabled="true"] {
  opacity: 0.5;
  pointer-events: none;
}

.cui-btn--primary { background: var(--cui-blue); color: var(--cui-on-accent); }
.cui-btn--primary:hover { background: var(--cui-blue-hover); box-shadow: var(--cui-shadow-blue); }

.cui-btn--accent { background: var(--cui-orange); color: var(--cui-on-accent); }
.cui-btn--accent:hover { background: var(--cui-orange-hover); box-shadow: 0 8px 28px rgba(255, 84, 0, 0.25); }

.cui-btn--secondary {
  background: var(--cui-surface);
  color: var(--cui-ink);
  border-color: var(--cui-border-2);
}
.cui-btn--secondary:hover { border-color: var(--cui-blue); color: var(--cui-blue); box-shadow: var(--cui-shadow-sm); }

.cui-btn--ghost { background: transparent; color: var(--cui-blue); }
.cui-btn--ghost:hover { background: var(--cui-blue-soft); }

.cui-btn--danger { background: var(--cui-red); color: var(--cui-on-accent); }
.cui-btn--danger:hover { filter: brightness(0.92); }

.cui-btn--sm { font-size: 0.8rem; padding: 0.45rem 1rem; border-radius: 10px; }
.cui-btn--lg { font-size: 1rem; padding: 0.9rem 2rem; border-radius: var(--cui-r); }

/* ----------------------------- Badge */
.cui-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.7rem;
  font-weight: 700;
  padding: 3px 9px;
  border-radius: var(--cui-r-full);
  white-space: nowrap;
  vertical-align: middle;
}
.cui-badge--blue { background: var(--cui-blue-soft); color: var(--cui-blue); }
.cui-badge--orange { background: var(--cui-orange-soft); color: var(--cui-orange); }
.cui-badge--green { background: var(--cui-green-soft); color: var(--cui-green); }
.cui-badge--red { background: var(--cui-red-soft); color: var(--cui-red); }
.cui-badge--gray { background: var(--cui-bg-2); color: var(--cui-text-2); }
.cui-badge__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
  animation: cui-pulse 2s infinite;
}
@keyframes cui-pulse {
  0% { box-shadow: 0 0 0 0 rgba(0, 80, 255, 0.35); }
  70% { box-shadow: 0 0 0 6px rgba(0, 80, 255, 0); }
  100% { box-shadow: 0 0 0 0 rgba(0, 80, 255, 0); }
}

/* ----------------------------- Card */
.cui-card {
  background: var(--cui-surface);
  border: 1px solid var(--cui-border);
  border-radius: var(--cui-r-lg);
  box-shadow: var(--cui-shadow-sm);
  overflow: hidden;
}
.cui-card--hover { transition: box-shadow 0.2s, transform 0.2s, border-color 0.2s; }
.cui-card--hover:hover {
  box-shadow: var(--cui-shadow-blue);
  border-color: var(--cui-blue-mid);
  transform: translateY(-2px);
}
.cui-card--flat { box-shadow: none; }
.cui-card__body { padding: 1.5rem; }
.cui-card__title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--cui-ink);
  letter-spacing: -0.01em;
  margin: 0 0 0.35rem;
}
.cui-card__subtitle { font-size: 0.85rem; color: var(--cui-text-2); margin: 0 0 0.8rem; }
.cui-card__footer {
  padding: 1rem 1.5rem;
  border-top: 1px solid var(--cui-border);
  background: var(--cui-surface-2);
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

/* ----------------------------- Stat */
.cui-stat { min-width: 8rem; }
.cui-stat__value {
  font-size: 2.2rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--cui-ink);
  line-height: 1.1;
}
.cui-stat__value .cui-accent { color: var(--cui-blue); }
.cui-stat__label { font-size: 0.85rem; color: var(--cui-text-2); margin-top: 0.25rem; }
.cui-stat__delta {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  font-size: 0.75rem;
  font-weight: 700;
  margin-top: 0.4rem;
  padding: 2px 8px;
  border-radius: var(--cui-r-full);
}
.cui-stat__delta--up { color: var(--cui-green); background: var(--cui-green-soft); }
.cui-stat__delta--down { color: var(--cui-red); background: var(--cui-red-soft); }

/* ----------------------------- form controls */
.cui-field { display: flex; flex-direction: column; gap: 0.35rem; min-width: 12rem; }
.cui-field__label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--cui-ink-2);
}
.cui-field__hint { font-size: 0.75rem; color: var(--cui-text-3); }
.cui-field__error { font-size: 0.75rem; color: var(--cui-red); font-weight: 500; }

.cui-input, .cui-select, .cui-textarea {
  font-family: var(--cui-font);
  font-size: 0.9rem;
  color: var(--cui-ink-2);
  background: var(--cui-surface);
  border: 1px solid var(--cui-border-2);
  border-radius: var(--cui-r);
  padding: 0.65rem 1rem;
  outline: none;
  width: 100%;
  transition: border-color 0.15s, box-shadow 0.15s;
}
.cui-textarea { resize: vertical; min-height: 6rem; }
.cui-input::placeholder, .cui-textarea::placeholder { color: var(--cui-text-3); }
.cui-input:focus, .cui-select:focus, .cui-textarea:focus {
  border-color: var(--cui-blue);
  box-shadow: 0 0 0 3px var(--cui-blue-mid);
}
.cui-input--error, .cui-select--error, .cui-textarea--error { border-color: var(--cui-red); }
.cui-input--error:focus, .cui-textarea--error:focus {
  border-color: var(--cui-red);
  box-shadow: 0 0 0 3px var(--cui-red-soft);
}
.cui-input:disabled, .cui-select:disabled, .cui-textarea:disabled {
  background: var(--cui-bg-2);
  color: var(--cui-text-3);
  cursor: not-allowed;
}
.cui-select {
  appearance: none;
  background-image: url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' fill='none'%3E%3Cpath d='M1 1.5 6 6.5 11 1.5' stroke='%236B6B8A' stroke-width='1.8' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 1rem center;
  padding-right: 2.5rem;
}

/* ----------------------------- Switch */
.cui-switch {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  cursor: pointer;
  user-select: none;
}
.cui-switch__track {
  position: relative;
  width: 42px;
  height: 24px;
  flex: none;
  border-radius: var(--cui-r-full);
  background: var(--cui-border-2);
  transition: background 0.18s;
}
.cui-switch__thumb {
  position: absolute;
  top: 3px;
  left: 3px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 1px 3px rgba(12, 12, 37, 0.25);
  transition: transform 0.18s;
}
.cui-switch--on .cui-switch__track { background: var(--cui-blue); }
.cui-switch--on .cui-switch__thumb { transform: translateX(18px); }
.cui-switch--disabled { opacity: 0.5; cursor: not-allowed; }
.cui-switch__label { font-size: 0.9rem; color: var(--cui-text); font-weight: 500; }

/* ----------------------------- Table */
.cui-table-wrap {
  background: var(--cui-surface);
  border: 1px solid var(--cui-border);
  border-radius: var(--cui-r-lg);
  box-shadow: var(--cui-shadow-sm);
  overflow-x: auto;
}
.cui-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}
.cui-table th {
  text-align: left;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--cui-text-2);
  background: var(--cui-surface-2);
  padding: 0.7rem 1.25rem;
  border-bottom: 1px solid var(--cui-border);
  white-space: nowrap;
}
.cui-table td {
  padding: 0.85rem 1.25rem;
  border-bottom: 1px solid var(--cui-border);
  color: var(--cui-text);
  vertical-align: middle;
}
.cui-table tbody tr:last-child td { border-bottom: none; }
.cui-table tbody tr { transition: background 0.12s; }
.cui-table--hover tbody tr:hover { background: var(--cui-blue-soft); }
.cui-table td.cui-table--num, .cui-table th.cui-table--num {
  text-align: right;
  font-variant-numeric: tabular-nums;
}

/* ----------------------------- Tabs */
.cui-tabs__bar {
  display: flex;
  gap: 0.25rem;
  border-bottom: 1px solid var(--cui-border);
}
.cui-tabs__tab {
  font-family: var(--cui-font);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--cui-text-2);
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  padding: 0.6rem 1rem;
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s;
}
.cui-tabs__tab:hover { color: var(--cui-ink); }
.cui-tabs__tab--active { color: var(--cui-blue); border-bottom-color: var(--cui-blue); }
.cui-tabs__panel { padding: 1.25rem 0.25rem; }

.cui-tabs--pills .cui-tabs__bar { border-bottom: none; gap: 0.4rem; }
.cui-tabs--pills .cui-tabs__tab {
  border: 1px solid var(--cui-border-2);
  border-radius: var(--cui-r-full);
  margin-bottom: 0;
  padding: 0.45rem 1.1rem;
}
.cui-tabs--pills .cui-tabs__tab--active {
  background: var(--cui-blue);
  border-color: var(--cui-blue);
  color: var(--cui-on-accent);
}

/* ----------------------------- Alert */
.cui-alert {
  display: flex;
  gap: 0.75rem;
  align-items: flex-start;
  padding: 0.9rem 1.1rem;
  border-radius: var(--cui-r);
  border: 1px solid;
  font-size: 0.875rem;
}
.cui-alert__icon { flex: none; font-weight: 800; line-height: 1.4; }
.cui-alert__title { font-weight: 700; color: var(--cui-ink); margin-bottom: 0.15rem; }
.cui-alert--info { background: var(--cui-blue-soft); border-color: var(--cui-blue-mid); color: var(--cui-text); }
.cui-alert--info .cui-alert__icon { color: var(--cui-blue); }
.cui-alert--success { background: var(--cui-green-soft); border-color: var(--cui-green); color: var(--cui-text); }
.cui-alert--success .cui-alert__icon { color: var(--cui-green); }
.cui-alert--warning { background: var(--cui-yellow-soft); border-color: var(--cui-yellow); color: var(--cui-text); }
.cui-alert--warning .cui-alert__icon { color: var(--cui-yellow); }
.cui-alert--error { background: var(--cui-red-soft); border-color: var(--cui-red); color: var(--cui-text); }
.cui-alert--error .cui-alert__icon { color: var(--cui-red); }

/* ----------------------------- Modal */
.cui-modal__overlay {
  position: fixed;
  inset: 0;
  background: rgba(12, 12, 37, 0.55);
  backdrop-filter: blur(3px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  z-index: 100;
}
.cui-modal {
  background: var(--cui-surface);
  border-radius: var(--cui-r-lg);
  box-shadow: var(--cui-shadow-xl);
  border: 1px solid var(--cui-border);
  width: 100%;
  max-width: 30rem;
  overflow: hidden;
}
.cui-modal__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 1.5rem 0;
}
.cui-modal__title {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--cui-ink);
  margin: 0;
}
.cui-modal__close {
  background: none;
  border: none;
  font-size: 1.3rem;
  line-height: 1;
  color: var(--cui-text-3);
  cursor: pointer;
  padding: 0.25rem;
  border-radius: var(--cui-r-sm);
  transition: color 0.15s, background 0.15s;
}
.cui-modal__close:hover { color: var(--cui-ink); background: var(--cui-bg-2); }
.cui-modal__body { padding: 1rem 1.5rem 1.5rem; font-size: 0.9rem; }
.cui-modal__footer {
  display: flex;
  justify-content: flex-end;
  gap: 0.6rem;
  padding: 1rem 1.5rem;
  border-top: 1px solid var(--cui-border);
  background: var(--cui-surface-2);
}

/* ----------------------------- Navbar */
.cui-navbar {
  display: flex;
  align-items: center;
  gap: 2rem;
  padding: 0.9rem 1.75rem;
  background: var(--cui-surface);
  border-bottom: 1px solid var(--cui-border);
}
.cui-navbar__brand {
  font-size: 1.1rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--cui-ink);
  text-decoration: none;
  white-space: nowrap;
}
.cui-navbar__brand .cui-accent { color: var(--cui-blue); }
.cui-navbar__links {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  flex: 1;
  min-width: 0;
}
.cui-navbar__link {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--cui-text);
  text-decoration: none;
  padding: 0.45rem 0.85rem;
  border-radius: var(--cui-r-sm);
  transition: color 0.15s, background 0.15s;
  white-space: nowrap;
}
.cui-navbar__link:hover { color: var(--cui-blue); }
.cui-navbar__link--active { color: var(--cui-blue); background: var(--cui-blue-soft); font-weight: 600; }
.cui-navbar__cta { display: flex; align-items: center; gap: 0.6rem; }

/* ----------------------------- Hero */
.cui-hero { padding: 4rem 2rem; text-align: center; }
.cui-hero--left { text-align: left; padding-left: 0; padding-right: 0; }
.cui-hero__badge { margin-bottom: 1.25rem; }
.cui-hero__title {
  font-size: clamp(2.4rem, 4.5vw, 3.6rem);
  font-weight: 800;
  color: var(--cui-ink);
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin: 0 0 1rem;
}
.cui-hero__title .cui-accent { color: var(--cui-blue); }
.cui-hero__subtitle {
  font-size: 1.1rem;
  color: var(--cui-text-2);
  max-width: 38rem;
  margin: 0 auto 1.75rem;
  line-height: 1.6;
}
.cui-hero--left .cui-hero__subtitle { margin-left: 0; }
.cui-hero__actions {
  display: flex;
  gap: 0.75rem;
  justify-content: center;
  flex-wrap: wrap;
}
.cui-hero--left .cui-hero__actions { justify-content: flex-start; }

/* ----------------------------- Footer */
.cui-footer {
  background: var(--cui-inverse-bg);
  color: var(--cui-inverse-text);
  padding: 3rem 2rem 1.5rem;
  border-radius: var(--cui-r-lg) var(--cui-r-lg) 0 0;
}
.cui-footer__grid {
  display: flex;
  flex-wrap: wrap;
  gap: 2.5rem;
  justify-content: space-between;
  margin-bottom: 2.5rem;
}
.cui-footer__brand { font-size: 1.2rem; font-weight: 800; letter-spacing: -0.02em; }
.cui-footer__brand .cui-accent { color: var(--cui-blue-hi); }
.cui-footer__tagline { font-size: 0.85rem; opacity: 0.65; margin-top: 0.5rem; max-width: 16rem; }
.cui-footer__col-title {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  opacity: 0.55;
  margin-bottom: 0.9rem;
}
.cui-footer__link {
  display: block;
  font-size: 0.875rem;
  color: inherit;
  opacity: 0.85;
  text-decoration: none;
  padding: 0.25rem 0;
  transition: opacity 0.15s, color 0.15s;
}
.cui-footer__link:hover { opacity: 1; color: var(--cui-blue-hi); }
.cui-footer__bottom {
  border-top: 1px solid rgba(128, 140, 200, 0.25);
  padding-top: 1.25rem;
  font-size: 0.8rem;
  opacity: 0.6;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem;
}
[data-theme="dark"] .cui-footer { border: 1px solid var(--cui-border); border-bottom: none; }