/* styles.css */

:root {
  color-scheme: light;

  --bg-main: #f5f6fa;
  --bg-elevated: rgba(255, 255, 255, 0.88);
  --border-subtle: rgba(0, 0, 0, 0.08);

  --text-main: #121212;     /* 深灰，而非纯黑 */
  --text-subtle: #2c2e31;   /* 次要文字 */

  --accent: #111827;       /* 主强调色（可换品牌色） */

  --top-nav-height: 56px;

  --sidebar-width: 160px;  

  --card-bg: rgba(255, 255, 255, 0.92);
  --card-bg-soft: rgba(255, 255, 255, 0.85);

  --card-border: rgba(0, 0, 0, 0.06);

  --card-shadow: 
    0 8px 30px rgba(0, 0, 0, 0.08),
    inset 0 1px 0 rgba(255, 255, 255, 0.6);
}


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

html,
body {
  margin: 0;
  padding-top: var(--top-nav-height);
}

body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "SF Pro Text",
    "Helvetica Neue", Arial, sans-serif;

  background: radial-gradient(
    circle at top,
    #ffffff 0%,
    #f3f4f6 45%,
    #e5e7eb 100%
  );

  color: var(--text-main);
  min-height: 100vh;
}


/* Utility text styles */

.muted {
  color: #475569;
  font-size: 12px;
  margin-top: 8px;
}

.ok {
  color: #4ade80;
}

.err {
  color: #f97373;
}

/* Top navigation */

.top-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 32px;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  background: linear-gradient(
    to bottom,
    rgba(255, 255, 255, 0.95),
    rgba(255, 255, 255, 0.85)
  );
  border-bottom: 1px solid var(--border-subtle);
}

.nav-logo {
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-main);
  text-decoration: none;
}

.nav-menu {
  list-style: none;
  display: flex;
  gap: 18px;
  margin: 0;
  padding: 0 24px;
}

.nav-menu li {
  margin: 0;
  padding: 0;
}

.nav-menu a {
  position: relative;
  font-size: 13px;
  color: var(--text-subtle);
  text-decoration: none;
  padding: 4px 0;
  transition: color 0.16s ease;
}

.nav-menu a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -4px;
  width: 0;
  height: 2px;
  border-radius: 999px;
  background: var(--accent);
  transition: width 0.2s ease;
}

.nav-menu a:hover {
  color: var(--text-main);
}

.nav-menu a:hover::after {
  width: 100%;
}

.nav-menu a.active {
  color: var(--accent);
}

.nav-menu a.active::after {
  width: 100%;
}

.nav-lang {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-lang select {
  font-size: 12px;
  padding: 4px 10px;
  border-radius: 999px;
  border: 1px solid var(--border-subtle);
  background: rgba(255, 255, 255, 0.95);
  color: var(--text-main);
  outline: none;
}

.nav-lang select:focus {
  border-color: var(--accent);
}

/* Auth button in nav */

.nav-auth-btn {
  font-size: 12px;
  padding: 6px 12px;
  border-radius: 999px;
  border: 1px solid var(--border-subtle);
  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(8px);
  color: var(--text-main);
  cursor: pointer;
  outline: none;
  white-space: nowrap;
}

.nav-auth-btn:hover {
  background: rgba(0, 0, 0, 0.06);
}

/* Page layout */

main {
  max-width: 960px;
  margin: 48px auto 64px;
  padding: 0 24px;
}

main h1 {
  font-size: 32px;
  margin: 0 0 16px;
}

main p {
  font-size: 15px;
  color: var(--text-subtle);
  max-width: 640px;
  line-height: 1.7;
}

.placeholder-box {
  margin-top: 32px;
  padding: 24px;
  border-radius: 16px;
  border: 1px dashed var(--card-border);
  background: var(--card-bg-soft);
  box-shadow: var(--card-shadow);
  font-size: 13px;
  color: var(--text-subtle);
}

/* Login page */

.auth-main {
  max-width: 480px;
  margin: 48px auto 64px;
  padding: 0 24px;
}

.auth-card {
  padding: 24px 24px 28px;
  border-radius: 20px;
  border: 1px solid var(--border-subtle);
  background: rgba(255, 255, 255, 0.9);
  box-shadow:
  0 6px 20px rgba(0, 0, 0, 0.08),
  inset 0 1px 0 rgba(255, 255, 255, 0.6);
}

.auth-card h1 {
  font-size: 26px;
  margin: 0 0 10px;
}

.auth-subtitle {
  font-size: 13px;
  color: var(--text-subtle);
  margin: 0 0 20px;
}

.auth-field {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 14px;
}

.auth-field label {
  font-size: 13px;
  color: var(--text-subtle);
}

.auth-field input[type="email"] {
  font-size: 14px;
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px solid rgba(0, 0, 0, 0.12);
  background: #ffffff;
  color: var(--text-main);
  outline: none;
}

.auth-field input[type="email"]:focus {
  border-color: var(--accent);
}

.auth-card button {
  width: 100%;
  margin-top: 6px;
  padding: 10px 12px;
  border-radius: 999px;
  border: 1px solid var(--border-subtle);
  font-size: 14px;
  cursor: pointer;
  outline: none;
}

.auth-primary {
  background: var(--accent);
  color: #111827;
  border-color: var(--accent);
}

.auth-primary:disabled {
  opacity: 0.7;
  cursor: default;
}

.auth-secondary {
  background: transparent;
  color: var(--text-main);
}

.auth-outline {
  background: transparent;
  color: var(--text-subtle);
}

.auth-card button:hover:not(:disabled).auth-primary {
  filter: brightness(1.05);
}

.auth-card button:hover:not(:disabled):not(.auth-primary) {
  background: rgba(0, 0, 0, 0.04);
}

.auth-divider {
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 14px 0;
  font-size: 11px;
  color: var(--text-subtle);
  text-transform: uppercase;
  letter-spacing: 0.16em;
}

.auth-divider::before,
.auth-divider::after {
  content: "";
  flex: 1;
  height: 1px;
  background: rgba(0, 0, 0, 0.08);
  margin: 0 10px;
}

.auth-footer-note {
  margin-top: 10px;
  font-size: 11px;
  color: var(--text-subtle);
}

/* ===== App Sidebar ===== */

.app-sidebar {
  position: fixed;
  top: calc(var(--top-nav-height) - 6px);
  left: 0;

  width: 160px;
  height: calc(100vh - var(--top-nav-height));

  background: var(--bg-elevated);
  border-right: 1px solid var(--border-subtle);
  padding: 20px 14px;
  z-index: 20;
}



.app-sidebar-nav {
  display: flex;
  flex-direction: column;
  gap: 4px;
}


.app-sidebar-nav .nav-item {
  font-size: 13px;
  color: var(--text-subtle);
  padding: 6px 12px;
  border-radius: 10px;
  cursor: pointer;

  transition:
    background 0.15s ease,
    color 0.15s ease;
}

.app-sidebar-nav .nav-item:hover {
  background: rgba(0, 0, 0, 0.04);
  color: var(--text-main);
}

.app-sidebar-nav .nav-item.active {
  background: rgba(0, 0, 0, 0.08);
  color: var(--accent);
  font-weight: 500;
}



.page-content {
  flex: 1;
  padding: 24px 32px;
}