/* ============================================================
   GadgetCheck / 数码验机助手 — Base Styles
   ============================================================ */

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--color-text-primary);
  background-color: var(--color-bg-base);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100dvh;
  overflow-x: hidden;
}

/* ─── Typography ─── */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: var(--weight-bold);
  line-height: var(--leading-tight);
  color: var(--color-text-primary);
}

h1 {
  font-size: var(--text-3xl);
  letter-spacing: -0.02em;
}

h2 {
  font-size: var(--text-2xl);
  letter-spacing: -0.01em;
}

h3 {
  font-size: var(--text-xl);
}

h4 {
  font-size: var(--text-lg);
}

p {
  margin-bottom: var(--space-4);
  color: var(--color-text-secondary);
}

a {
  color: var(--color-primary-light);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-primary);
}

a:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

strong {
  font-weight: var(--weight-semibold);
  color: var(--color-text-primary);
}

code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  padding: 2px 6px;
  background: var(--color-bg-muted);
  border-radius: var(--radius-sm);
  color: var(--color-primary-light);
}

/* ─── Layout ─── */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

.section {
  padding: var(--space-12) 0;
}

.section-title {
  font-size: var(--text-2xl);
  margin-bottom: var(--space-2);
}

.section-desc {
  color: var(--color-text-secondary);
  margin-bottom: var(--space-8);
}

/* ─── Cards (Glassmorphism) ─── */
.card {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

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

.card--elevated {
  background: var(--color-bg-elevated);
  box-shadow: var(--shadow-md);
}

/* ─── Buttons ─── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: var(--weight-medium);
  line-height: 1;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
  min-height: 44px;
  text-decoration: none;
}

.btn:focus-visible {
  outline: 2px solid var(--color-ring, var(--color-primary));
  outline-offset: 2px;
}

.btn:active {
  transform: scale(0.97);
}

.btn--primary {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  color: var(--color-text-inverse);
  box-shadow: 0 2px 8px rgba(6, 182, 212, 0.3);
}

.btn--primary:hover {
  background: linear-gradient(135deg, var(--color-primary-light), var(--color-primary));
  box-shadow: 0 4px 16px rgba(6, 182, 212, 0.4);
  transform: translateY(-1px);
}

.btn--secondary {
  background: var(--color-bg-elevated);
  color: var(--color-text-primary);
  border: 1px solid var(--color-border);
}

.btn--secondary:hover {
  border-color: var(--color-primary);
  color: var(--color-primary-light);
}

.btn--ghost {
  background: transparent;
  color: var(--color-text-secondary);
}

.btn--ghost:hover {
  background: var(--color-bg-muted);
  color: var(--color-text-primary);
}

.btn--sm {
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  min-height: 36px;
}

.btn--lg {
  padding: var(--space-4) var(--space-8);
  font-size: var(--text-md);
  min-height: 52px;
}

.btn--block {
  width: 100%;
}

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

/* ─── Form Elements ─── */
.form-group {
  margin-bottom: var(--space-4);
}

.form-label {
  display: block;
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-2);
}

.form-input,
.form-select {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text-primary);
  background: var(--color-bg-muted);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  min-height: 44px;
  appearance: none;
}

.form-input:focus,
.form-select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-glow);
}

.form-input::placeholder {
  color: var(--color-text-muted);
}

.form-select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' fill='%2394A3B8' viewBox='0 0 16 16'%3E%3Cpath d='M4 6l4 4 4-4'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 40px;
}

.form-error {
  font-size: var(--text-xs);
  color: var(--color-error);
  margin-top: var(--space-1);
}

.form-helper {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-top: var(--space-1);
}

/* ─── Risk Badges ─── */
.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-xs);
  font-weight: var(--weight-semibold);
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.badge--low {
  background: rgba(16, 185, 129, 0.15);
  color: var(--color-risk-low);
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.badge--medium {
  background: rgba(245, 158, 11, 0.15);
  color: var(--color-risk-medium);
  border: 1px solid rgba(245, 158, 11, 0.3);
}

.badge--high {
  background: rgba(239, 68, 68, 0.15);
  color: var(--color-risk-high);
  border: 1px solid rgba(239, 68, 68, 0.3);
}

.badge--critical {
  background: rgba(153, 27, 27, 0.2);
  color: #FCA5A5;
  border: 1px solid rgba(153, 27, 27, 0.4);
}

/* ─── Price Range Gauge ─── */
.price-gauge {
  position: relative;
  height: 8px;
  background: var(--color-bg-muted);
  border-radius: var(--radius-full);
  overflow: hidden;
  margin: var(--space-3) 0;
}

.price-gauge__fill {
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  border-radius: var(--radius-full);
  background: linear-gradient(90deg, var(--color-secondary), var(--color-primary));
  transition: width var(--transition-slow);
}

.price-gauge__marker {
  position: absolute;
  top: -4px;
  width: 16px;
  height: 16px;
  background: var(--color-primary-light);
  border: 2px solid var(--color-bg-surface);
  border-radius: 50%;
  transform: translateX(-50%);
  box-shadow: var(--shadow-glow);
}

/* ─── Checklist ─── */
.checklist {
  list-style: none;
}

.checklist__item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-3) 0;
  border-bottom: 1px solid var(--color-border);
  font-size: var(--text-base);
  color: var(--color-text-secondary);
}

.checklist__item:last-child {
  border-bottom: none;
}

.checklist__checkbox {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  margin-top: 2px;
  border: 2px solid var(--color-border-hover);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
  appearance: none;
  background: transparent;
}

.checklist__checkbox:checked {
  background: var(--color-primary);
  border-color: var(--color-primary);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%230F172A' viewBox='0 0 16 16'%3E%3Cpath d='M13.485 3.515a1 1 0 0 1 0 1.414l-7.07 7.07a1 1 0 0 1-1.415 0l-3.535-3.535a1 1 0 1 1 1.414-1.414L5.707 9.88l6.364-6.364a1 1 0 0 1 1.414 0z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: center;
}

.checklist__item--checked {
  color: var(--color-text-muted);
  text-decoration: line-through;
}

/* ─── Navigation ─── */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: rgba(11, 17, 32, 0.85);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
  z-index: var(--z-sticky);
  display: flex;
  align-items: center;
}

.nav__container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav__logo {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-bold);
  color: var(--color-text-primary);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.nav__logo-icon {
  width: 28px;
  height: 28px;
  color: var(--color-primary);
}

.nav__links {
  display: none;
  list-style: none;
  gap: var(--space-6);
}

.nav__link {
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

.nav__link:hover,
.nav__link--active {
  color: var(--color-primary-light);
}

.nav__actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

/* Desktop nav */
@media (min-width: 768px) {
  .nav__links {
    display: flex;
  }
}

/* ─── Mobile Bottom Bar ─── */
.bottom-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: var(--bottom-bar-height);
  background: rgba(11, 17, 32, 0.95);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-top: 1px solid var(--color-border);
  z-index: var(--z-sticky);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 var(--space-4);
  padding-bottom: env(safe-area-inset-bottom, 0);
}

@media (min-width: 768px) {
  .bottom-bar {
    display: none;
  }
}

/* ─── Page Layout ─── */
.page {
  padding-top: var(--nav-height);
  padding-bottom: var(--bottom-bar-height);
  min-height: 100dvh;
}

@media (min-width: 768px) {
  .page {
    padding-bottom: 0;
  }
}

/* ─── Footer ─── */
.footer {
  background: var(--color-bg-surface);
  border-top: 1px solid var(--color-border);
  padding: var(--space-10) 0 var(--space-6);
}

.footer__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
}

@media (min-width: 768px) {
  .footer__grid {
    grid-template-columns: 2fr 1fr 1fr 1fr;
  }
}

.footer__title {
  font-size: var(--text-sm);
  font-weight: var(--weight-semibold);
  color: var(--color-text-primary);
  margin-bottom: var(--space-4);
}

.footer__link {
  display: block;
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  padding: var(--space-1) 0;
  transition: color var(--transition-fast);
}

.footer__link:hover {
  color: var(--color-primary-light);
}

.footer__bottom {
  margin-top: var(--space-8);
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-border);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-4);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

/* ─── Utilities ─── */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

.text-center { text-align: center; }
.text-primary { color: var(--color-primary-light); }
.text-muted { color: var(--color-text-muted); }

.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: var(--space-2); }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }

.grid { display: grid; }
.grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid-cols-3 { grid-template-columns: repeat(3, 1fr); }

@media (max-width: 767px) {
  .grid-cols-2, .grid-cols-3 {
    grid-template-columns: 1fr;
  }
}

.mt-4 { margin-top: var(--space-4); }
.mt-8 { margin-top: var(--space-8); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-8 { margin-bottom: var(--space-8); }

/* ─── Animations ─── */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes pulse-glow {
  0%, 100% {
    box-shadow: 0 0 8px var(--color-primary-glow);
  }
  50% {
    box-shadow: 0 0 20px var(--color-primary-glow), 0 0 40px rgba(6, 182, 212, 0.08);
  }
}

.animate-fade-in {
  animation: fadeInUp var(--transition-slow) ease both;
}

.animate-glow {
  animation: pulse-glow 3s ease-in-out infinite;
}

/* Stagger children */
.stagger > *:nth-child(1) { animation-delay: 0ms; }
.stagger > *:nth-child(2) { animation-delay: 60ms; }
.stagger > *:nth-child(3) { animation-delay: 120ms; }
.stagger > *:nth-child(4) { animation-delay: 180ms; }
.stagger > *:nth-child(5) { animation-delay: 240ms; }
.stagger > *:nth-child(6) { animation-delay: 300ms; }