/* ============================================================
   纹脉 · Outbound — Main Stylesheet
   全局样式 & 组件
   ============================================================ */

/* === Reset & Base === */
*,
*::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-sans);
  color: var(--color-ink);
  background-color: var(--color-paper);

  /* 宣纸质感模拟 */
  background-image:
    radial-gradient(ellipse at 20% 50%, rgba(200, 180, 150, 0.08) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 20%, rgba(180, 160, 130, 0.06) 0%, transparent 50%),
    radial-gradient(ellipse at 50% 80%, rgba(200, 180, 150, 0.05) 0%, transparent 50%);
  background-attachment: fixed;
  line-height: 1.6;
  min-height: 100vh;
}

img {
  display: block;
  max-width: 100%;
  height: auto;
}

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

ul, ol {
  list-style: none;
}

button {
  cursor: pointer;
  font-family: inherit;
  font-size: inherit;
  border: none;
  background: none;
  color: inherit;
}

input, select {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
}

/* === Typography === */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-serif);
  font-weight: 700;
  line-height: 1.3;
}

h1 { font-size: var(--text-5xl); }
h2 { font-size: var(--text-3xl); }
h3 { font-size: var(--text-2xl); }
h4 { font-size: var(--text-xl); }

.serif { font-family: var(--font-serif); }
.sans { font-family: var(--font-sans); }
.brand { font-family: var(--font-brand); }

.text--muted { color: var(--color-ink-light); }
.text--faint { color: var(--color-ink-lighter); }
.text--vermillion { color: var(--color-vermillion); }
.text--gold { color: var(--color-gold); }

/* === Layout === */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--padding-desktop);
}

.section {
  padding: var(--space-3xl) 0;
}

.section--lg {
  padding: var(--space-4xl) 0;
}

.section-title {
  font-size: var(--text-3xl);
  text-align: center;
  margin-bottom: var(--space-sm);
}

.section-subtitle {
  font-size: var(--text-base);
  color: var(--color-ink-light);
  text-align: center;
  margin-bottom: var(--space-2xl);
}

/* 国风分隔线 */
.divider {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  margin: var(--space-2xl) 0;
  color: var(--color-gold);
}

.divider::before,
.divider::after {
  content: '';
  height: 1px;
  width: 60px;
  background: var(--color-tan);
}

.divider__diamond {
  width: 8px;
  height: 8px;
  background: var(--color-gold);
  transform: rotate(45deg);
  flex-shrink: 0;
}

/* === Navigation === */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(250, 247, 242, 0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-tan-light);
  height: var(--nav-height);
  transition: box-shadow var(--transition-base);
}

.nav--scrolled {
  box-shadow: var(--shadow-md);
}

.nav__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--padding-desktop);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-lg);
}

.nav__brand {
  font-family: var(--font-brand);
  font-size: var(--text-xl);
  color: var(--color-ink);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  flex-shrink: 0;
}

.nav__brand img {
  height: 32px;
  width: auto;
}

.nav__search {
  flex: 1;
  max-width: 320px;
  position: relative;
}

.nav__search input {
  width: 100%;
  padding: 8px 16px 8px 36px;
  border: 1px solid var(--color-tan);
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.6);
  font-size: var(--text-sm);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.nav__search input:focus {
  outline: none;
  border-color: var(--color-gold);
  box-shadow: 0 0 0 3px rgba(184, 160, 122, 0.15);
}

.nav__search-icon {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-ink-lighter);
  pointer-events: none;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  flex-shrink: 0;
}

.nav__link {
  font-size: var(--text-sm);
  color: var(--color-ink-light);
  transition: color var(--transition-fast);
}

.nav__link:hover {
  color: var(--color-vermillion);
}

.nav__link--btn {
  padding: 8px 20px;
  background: var(--color-vermillion);
  color: #fff;
  border-radius: var(--radius-full);
  font-weight: 500;
  transition: background var(--transition-fast), transform var(--transition-fast);
}

.nav__link--btn:hover {
  background: var(--color-vermillion-dark);
  transform: translateY(-1px);
  color: #fff;
}

.nav__hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 4px;
  cursor: pointer;
}

.nav__hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-ink);
  border-radius: 1px;
  transition: all var(--transition-base);
}

/* === Buttons === */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: 12px 28px;
  font-size: var(--text-base);
  font-weight: 500;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  cursor: pointer;
  min-height: 44px;
}

.btn--primary {
  background: var(--color-vermillion);
  color: #fff;
}

.btn--primary:hover {
  background: var(--color-vermillion-dark);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn--outline {
  border: 1px solid var(--color-tan);
  color: var(--color-ink);
  background: transparent;
}

.btn--outline:hover {
  border-color: var(--color-vermillion);
  color: var(--color-vermillion);
}

.btn--gold {
  background: var(--color-gold);
  color: #fff;
}

.btn--gold:hover {
  background: var(--color-gold-dark);
  transform: translateY(-1px);
}

.btn--lg {
  padding: 16px 36px;
  font-size: var(--text-lg);
  min-height: 56px;
}

.btn--sm {
  padding: 6px 16px;
  font-size: var(--text-sm);
  min-height: 36px;
}

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

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

/* === Cards === */
.card {
  background: #fff;
  border: 1px solid var(--color-tan-light);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: box-shadow var(--transition-base), transform var(--transition-base);
}

.card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.card__image {
  position: relative;
  overflow: hidden;
  aspect-ratio: 3 / 4;
  background: var(--color-paper-dark);
}

.card__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.card:hover .card__image img {
  transform: scale(1.05);
}

.card__body {
  padding: var(--space-md);
}

.card__title {
  font-family: var(--font-serif);
  font-size: var(--text-base);
  margin-bottom: var(--space-xs);
}

.card__meta {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--text-xs);
  color: var(--color-ink-lighter);
}

/* 图案卡片晕染效果 */
.card__image::after {
  content: '';
  position: absolute;
  inset: 0;
  box-shadow: inset 0 0 30px rgba(139, 115, 85, 0.08);
  pointer-events: none;
}

/* === Tags === */
.tag {
  display: inline-flex;
  align-items: center;
  padding: 2px 10px;
  font-size: var(--text-xs);
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-tan);
  color: var(--color-ink-light);
  background: transparent;
}

.tag--vermillion {
  border-color: var(--color-vermillion);
  color: var(--color-vermillion);
}

.tag--gold {
  border-color: var(--color-gold);
  color: var(--color-gold-dark);
}

/* === Forms === */
.form-group {
  margin-bottom: var(--space-lg);
}

.form-label {
  display: block;
  font-size: var(--text-sm);
  font-weight: 500;
  margin-bottom: var(--space-sm);
  color: var(--color-ink);
}

.form-input {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--color-tan);
  border-radius: var(--radius-md);
  background: #fff;
  font-size: var(--text-base);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-input:focus {
  outline: none;
  border-color: var(--color-gold);
  box-shadow: 0 0 0 3px rgba(184, 160, 122, 0.12);
}

.form-input--error {
  border-color: var(--color-error);
}

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

.form-checkbox {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--text-sm);
  cursor: pointer;
}

.form-checkbox input[type="checkbox"] {
  width: 18px;
  height: 18px;
  accent-color: var(--color-vermillion);
}

/* === Toast === */
.toast-container {
  position: fixed;
  bottom: var(--space-xl);
  right: var(--space-xl);
  z-index: 1000;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  pointer-events: none;
}

.toast {
  pointer-events: auto;
  padding: 14px 24px;
  background: var(--color-ink);
  color: #fff;
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  box-shadow: var(--shadow-lg);
  animation: toastIn var(--transition-base) ease forwards,
             toastOut var(--transition-base) ease 2.5s forwards;
  max-width: 360px;
}

.toast--success {
  border-left: 3px solid var(--color-success);
}

.toast--error {
  border-left: 3px solid var(--color-error);
}

@keyframes toastIn {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes toastOut {
  from { opacity: 1; transform: translateY(0); }
  to   { opacity: 0; transform: translateY(-20px); }
}

/* === Skeleton Loading === */
.skeleton {
  background: linear-gradient(
    90deg,
    var(--color-paper-dark) 25%,
    var(--color-tan-light) 50%,
    var(--color-paper-dark) 75%
  );
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: var(--radius-md);
}

@keyframes shimmer {
  0%   { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

.skeleton--image {
  aspect-ratio: 3 / 4;
}

.skeleton--text {
  height: 1em;
  margin-bottom: 0.5em;
}

.skeleton--text:last-child {
  width: 60%;
}

/* === Pattern Grid === */
.pattern-grid {
  display: grid;
  grid-template-columns: repeat(var(--grid-cols, 4), 1fr);
  gap: var(--card-gap);
}

.pattern-grid--5 { --grid-cols: 5; }
.pattern-grid--4 { --grid-cols: 4; }
.pattern-grid--3 { --grid-cols: 3; }
.pattern-grid--2 { --grid-cols: 2; }

/* === Pagination === */
.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  margin-top: var(--space-2xl);
}

.pagination__btn {
  padding: 8px 16px;
  border: 1px solid var(--color-tan);
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  color: var(--color-ink-light);
  transition: all var(--transition-fast);
}

.pagination__btn:hover:not(.pagination__btn--disabled) {
  border-color: var(--color-vermillion);
  color: var(--color-vermillion);
}

.pagination__btn--active {
  background: var(--color-vermillion);
  color: #fff;
  border-color: var(--color-vermillion);
}

.pagination__btn--disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

/* === Footer === */
.footer {
  background: var(--color-ink);
  color: var(--color-ink-faint);
  padding: var(--space-3xl) 0 var(--space-xl);
  margin-top: var(--space-4xl);
}

.footer__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--padding-desktop);
}

.footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-2xl);
  margin-bottom: var(--space-2xl);
}

.footer__brand {
  font-family: var(--font-brand);
  font-size: var(--text-xl);
  color: var(--color-tan-light);
  margin-bottom: var(--space-md);
}

.footer__desc {
  font-size: var(--text-sm);
  line-height: 1.8;
  color: var(--color-ink-lighter);
}

.footer__heading {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-tan-light);
  margin-bottom: var(--space-md);
}

.footer__link {
  display: block;
  font-size: var(--text-sm);
  color: var(--color-ink-lighter);
  margin-bottom: var(--space-sm);
  transition: color var(--transition-fast);
}

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

.footer__bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: var(--space-lg);
  font-size: var(--text-xs);
  text-align: center;
  color: var(--color-ink-lighter);
}

/* === Seal Effect (印章) === */
.seal {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: var(--seal-size);
  height: var(--seal-size);
  border: 2px solid var(--color-vermillion);
  color: var(--color-vermillion);
  font-family: var(--font-serif);
  font-size: var(--text-sm);
  transform: rotate(-5deg);
  flex-shrink: 0;
  user-select: none;
}

.seal--sm {
  width: var(--seal-size-sm);
  height: var(--seal-size-sm);
  font-size: var(--text-xs);
}

/* === Utility === */
.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; }
.mt-1 { margin-top: var(--space-md); }
.mt-2 { margin-top: var(--space-lg); }
.mt-3 { margin-top: var(--space-xl); }
.mt-4 { margin-top: var(--space-2xl); }
.mb-1 { margin-bottom: var(--space-md); }
.mb-2 { margin-bottom: var(--space-lg); }
.mb-3 { margin-bottom: var(--space-xl); }
.hidden { display: none !important; }

/* Scrollbar */
::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: var(--color-paper);
}

::-webkit-scrollbar-thumb {
  background: var(--color-tan);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-gold);
}