* {
  box-sizing: border-box;
}

html {
  height: 100%;
  min-height: 100%;
}

body {
  height: 100%;
  margin: 0;
  min-height: 100%;
  overflow: hidden;
  overflow-x: hidden;
  position: relative;
  font-family: "Inter", "Segoe UI", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  color: var(--color-text);
}

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

button,
input,
select,
textarea {
  color: inherit;
  font: inherit;
}

button,
.session-item {
  cursor: pointer;
  overflow: hidden;
  position: relative;
  transition:
    transform var(--transition-smooth),
    border-color var(--transition-smooth),
    box-shadow var(--transition-smooth),
    background var(--transition-smooth);
}

button {
  -webkit-appearance: none;
  appearance: none;
  background: none;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  min-height: 40px;
  padding: 10px 16px;
}

button:hover,
.session-item:hover {
  transform: translateY(-1px);
}

button:active,
.session-item:active {
  transform: translateY(0) scale(0.99);
}

input,
select,
textarea {
  width: 100%;
  background: var(--color-input-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  transition:
    border-color var(--transition-smooth),
    box-shadow var(--transition-smooth),
    transform var(--transition-smooth);
}

textarea {
  min-height: 140px;
  resize: vertical;
}

input:focus,
select:focus,
textarea:focus {
  border-color: var(--color-accent-strong);
  box-shadow: 0 0 0 4px var(--color-focus-ring);
  outline: none;
}

select {
  appearance: none;
  background-image:
    linear-gradient(45deg, transparent 50%, var(--color-muted) 50%),
    linear-gradient(135deg, var(--color-muted) 50%, transparent 50%);
  background-position:
    calc(100% - 20px) calc(50% - 3px),
    calc(100% - 14px) calc(50% - 3px);
  background-repeat: no-repeat;
  background-size: 6px 6px;
  padding-right: 38px;
}

.hidden {
  display: none !important;
}

.muted {
  color: var(--color-muted);
}

.stack {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.surface-card {
  backdrop-filter: blur(18px) saturate(130%);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  box-shadow: 0 26px 70px var(--color-shadow);
}

.surface-inset {
  background: var(--color-inset);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 18px;
}

.eyebrow {
  color: var(--color-accent);
  display: inline-flex;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.section-heading {
  align-items: center;
  display: flex;
  justify-content: space-between;
  gap: 16px;
}

.section-heading h2,
.brand-lockup h1,
.hero-copy h2,
.auth-header h2,
.login-copy h1 {
  margin: 0;
}

.metric-pill {
  align-items: center;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  color: var(--color-highlight);
  display: inline-flex;
  font-size: 0.9rem;
  justify-content: center;
  min-width: 44px;
  padding: 8px 14px;
}

.status {
  background: var(--color-status-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.05);
  margin: 0;
  overflow: auto;
  padding: 16px 18px;
  white-space: pre-wrap;
}

.button-primary {
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.12), var(--color-accent-warm));
  border-color: rgba(255, 255, 255, 0.08);
  box-shadow: 0 18px 36px rgba(0, 0, 0, 0.18);
  color: var(--color-highlight);
}

.button-secondary {
  background: rgba(255, 255, 255, 0.06);
  border-color: var(--color-border);
  color: var(--color-subtle);
}

.button-ghost {
  background: transparent;
  border-color: var(--color-border-soft);
  color: var(--color-muted);
}

.button-danger {
  border-color: rgba(198, 135, 135, 0.18);
  color: #ffd0d0;
}

.button-primary:hover,
.button-secondary:hover,
.button-ghost:hover {
  border-color: var(--color-accent-strong);
  box-shadow: 0 16px 34px rgba(0, 0, 0, 0.22);
}

.reveal {
  animation: fade-in-up 650ms var(--transition-spring) both;
}

.button-ripple {
  animation: ripple-expand 720ms ease-out forwards;
  background: rgba(255, 255, 255, 0.22);
  border-radius: 999px;
  pointer-events: none;
  position: absolute;
  transform: scale(0);
}

::-webkit-scrollbar {
  height: 10px;
  width: 10px;
}

::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.16);
  border: 2px solid transparent;
  border-radius: 999px;
  background-clip: padding-box;
}

::-webkit-scrollbar-track {
  background: rgba(255, 255, 255, 0.03);
}

@keyframes fade-in-up {
  from {
    opacity: 0;
    transform: translate3d(0, 14px, 0);
  }

  to {
    opacity: 1;
    transform: translate3d(0, 0, 0);
  }
}

@keyframes ripple-expand {
  from {
    opacity: 0.55;
    transform: scale(0);
  }

  to {
    opacity: 0;
    transform: scale(4);
  }
}

@keyframes float-soft {
  0%,
  100% {
    transform: translate3d(0, 0, 0);
  }

  50% {
    transform: translate3d(0, -8px, 0);
  }
}