:root {
  --bg: #f4f6fb;
  --card: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
  --primary: #4f46e5;
  --primary-hover: #4338ca;
  --border: #e5e7eb;
  --error: #dc2626;
  --shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei",
               "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

/* ── HEADER ── */
.site-header {
  background: linear-gradient(135deg, #4f46e5 0%, #7c3aed 100%);
  color: #fff;
  padding: 0 32px;
  box-shadow: var(--shadow);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
  gap: 16px;
}
.site-header h1 {
  margin: 0;
  font-size: 20px;
  letter-spacing: 0.5px;
  white-space: nowrap;
}
.site-header h1 a {
  color: #fff;
  text-decoration: none;
}
.header-right {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-shrink: 0;
}
.user-info {
  color: #ffffffcc;
  font-size: 13px;
}
.btn-logout {
  color: #ffffffcc;
  font-size: 13px;
  text-decoration: none;
  border: 1px solid rgba(255,255,255,.35);
  padding: 4px 12px;
  border-radius: 6px;
  transition: all .15s;
}
.btn-logout:hover {
  background: rgba(255,255,255,.15);
  color: #fff;
}

/* Subnav */
.subnav {
  display: flex;
  gap: 4px;
  padding: 0 0 12px 0;
}
.subnav a {
  color: #ffffffaa;
  text-decoration: none;
  font-size: 13px;
  padding: 4px 10px;
  border-radius: 6px;
  transition: all .15s;
}
.subnav a:hover,
.subnav a.active {
  color: #fff;
  background: rgba(255,255,255,.15);
}

/* ── LAYOUT ── */
.container {
  max-width: 860px;
  margin: 32px auto;
  padding: 0 16px;
}

/* ── CARD ── */
.card {
  background: var(--card);
  border-radius: 12px;
  padding: 28px;
  box-shadow: var(--shadow);
  margin-bottom: 24px;
}
.card h2, .card h3 { margin-top: 0; }

/* ── FORM ── */
.form { display: flex; flex-direction: column; gap: 18px; }
.form label { display: flex; flex-direction: column; gap: 6px; font-size: 14px; color: var(--muted); }
.form label span em { color: var(--error); font-style: normal; margin-left: 2px; }
.form label small { color: #9ca3af; }
.form input[type="text"],
.form input[type="tel"],
.form input[type="password"],
.form textarea {
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 15px;
  color: var(--text);
  background: #fafbfd;
  transition: border-color 0.15s, background 0.15s;
  font-family: inherit;
}
.form input:focus,
.form textarea:focus {
  outline: none;
  border-color: var(--primary);
  background: #fff;
}
.form input[type="file"] { font-size: 14px; }
.form textarea { resize: vertical; }

.actions {
  display: flex;
  gap: 16px;
  align-items: center;
  flex-wrap: wrap;
}

/* ── BUTTONS ── */
.btn {
  display: inline-block;
  padding: 10px 18px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: #fff;
  color: var(--text);
  font-size: 14px;
  cursor: pointer;
  text-decoration: none;
  transition: all 0.15s;
}
.btn:hover { border-color: #c7cbd4; }
.btn.primary {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}
.btn.primary:hover { background: var(--primary-hover); border-color: var(--primary-hover); }
.btn.link {
  background: none;
  border: none;
  color: var(--primary);
  padding: 10px 0;
}
.btn.link:hover { color: var(--primary-hover); text-decoration: underline; }
.full-width { width: 100%; text-align: center; }

/* ── MESSAGES ── */
.error {
  background: #fef2f2;
  color: var(--error);
  padding: 10px 14px;
  border-radius: 8px;
  border: 1px solid #fecaca;
  margin-bottom: 16px;
  font-size: 14px;
}
.empty {
  color: var(--muted);
  text-align: center;
  padding: 20px;
}

/* ── AUTH PAGES ── */
.auth-wrap {
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding: 16px 16px 40px;
}
.auth-card {
  width: 100%;
  max-width: 420px;
  padding: 36px 32px;
}
.auth-logo {
  font-size: 40px;
  text-align: center;
  margin-bottom: 8px;
}
.auth-title {
  text-align: center;
  font-size: 22px;
  margin: 0 0 24px;
  color: var(--text);
}
.auth-switch {
  text-align: center;
  margin: 20px 0 0;
  font-size: 14px;
  color: var(--muted);
}
.auth-switch a {
  color: var(--primary);
  text-decoration: none;
}
.auth-switch a:hover { text-decoration: underline; }

/* ── DASHBOARD ── */
.dashboard-welcome {
  text-align: center;
  padding: 32px 0 16px;
}
.dashboard-welcome h2 {
  font-size: 26px;
  margin: 0 0 6px;
}
.dashboard-welcome p {
  color: var(--muted);
  margin: 0;
}
.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
  margin-top: 24px;
}
.tool-card {
  background: var(--card);
  border-radius: 16px;
  padding: 36px 28px;
  box-shadow: var(--shadow);
  text-decoration: none;
  color: var(--text);
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 14px;
  border: 2px solid transparent;
  transition: all .2s;
}
.tool-card:hover {
  border-color: var(--primary);
  box-shadow: 0 8px 32px rgba(79, 70, 229, 0.15);
  transform: translateY(-2px);
}
.tool-icon {
  width: 72px;
  height: 72px;
  border-radius: 18px;
  background: linear-gradient(135deg, #ede9fe 0%, #ddd6fe 100%);
  display: flex;
  align-items: center;
  justify-content: center;
}
.tool-name {
  font-size: 17px;
  font-weight: 700;
  color: var(--text);
}
.tool-desc {
  font-size: 13px;
  color: var(--muted);
  line-height: 1.5;
}

/* ── REQUESTS ── */
.submitter-badge {
  background: #f0fdf4;
  border: 1px solid #bbf7d0;
  border-radius: 8px;
  padding: 8px 14px;
  font-size: 13px;
  color: #166534;
  margin-bottom: 20px;
}
.comment-as {
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 14px;
  padding: 8px 12px;
  background: #f9fafb;
  border-radius: 8px;
  border: 1px solid var(--border);
}
.comment-as b { color: var(--text); }

.list-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
  flex-wrap: wrap;
  gap: 12px;
}
.list-header h2 { margin: 0; }

.req-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.req-item {
  display: flex;
  gap: 20px;
  padding: 18px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: #fcfcfd;
  transition: all 0.15s;
}
.req-item:hover { border-color: #c7cbd4; background: #fff; }
.req-main { flex: 1; min-width: 0; }
.req-top {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 6px;
  flex-wrap: wrap;
}
.req-title {
  font-size: 17px;
  font-weight: 600;
  color: var(--text);
  text-decoration: none;
}
.req-title:hover { color: var(--primary); }
.req-content {
  color: #374151;
  margin: 6px 0;
  white-space: pre-wrap;
  word-wrap: break-word;
}
.req-content.detail {
  font-size: 16px;
  background: #f9fafb;
  padding: 16px;
  border-radius: 8px;
  border-left: 3px solid var(--primary);
}
.req-thumb {
  max-width: 180px;
  max-height: 120px;
  border-radius: 8px;
  border: 1px solid var(--border);
  display: block;
  margin: 8px 0;
}
.req-image {
  max-width: 100%;
  border-radius: 8px;
  border: 1px solid var(--border);
  margin: 12px 0;
}
.req-meta {
  display: flex;
  gap: 16px;
  font-size: 13px;
  color: var(--muted);
  flex-wrap: wrap;
  margin-top: 8px;
}
.req-aside {
  display: flex;
  flex-direction: column;
  gap: 10px;
  align-items: flex-end;
  justify-content: space-between;
}

.status {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 12px;
  font-size: 12px;
  font-weight: 500;
}
.status-待处理 { background: #fef3c7; color: #92400e; }
.status-进行中 { background: #dbeafe; color: #1e40af; }
.status-已完成 { background: #d1fae5; color: #065f46; }
.status-已搁置 { background: #e5e7eb; color: #374151; }

.like-btn {
  background: #fff;
  border: 1px solid var(--border);
  padding: 8px 16px;
  border-radius: 20px;
  cursor: pointer;
  font-size: 14px;
  transition: all 0.15s;
}
.like-btn:hover { border-color: var(--primary); color: var(--primary); }
.like-btn.liked { background: #fef2f2; border-color: #fca5a5; color: #dc2626; }
.like-count { font-weight: 600; margin-left: 4px; }

.detail-actions {
  display: flex;
  gap: 20px;
  align-items: center;
  margin: 20px 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--border);
  flex-wrap: wrap;
}
.status-form {
  display: flex;
  gap: 8px;
  align-items: center;
  font-size: 14px;
  color: var(--muted);
}
.status-form select {
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: #fff;
  font-family: inherit;
}

.back {
  display: inline-block;
  color: var(--primary);
  text-decoration: none;
  margin-bottom: 14px;
  font-size: 14px;
}
.back:hover { text-decoration: underline; }

.comments {
  list-style: none;
  padding: 0;
  margin: 0 0 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.comment {
  padding: 12px 16px;
  background: #f9fafb;
  border-radius: 8px;
  border-left: 3px solid var(--border);
}
.comment-head {
  display: flex;
  gap: 12px;
  align-items: center;
  margin-bottom: 4px;
  font-size: 14px;
}
.muted { color: var(--muted); font-size: 12px; }
.comment-body {
  color: #374151;
  white-space: pre-wrap;
  word-wrap: break-word;
}

/* ── FOOTER ── */
.site-footer {
  text-align: center;
  color: var(--muted);
  padding: 24px;
  font-size: 13px;
}

/* ── RESPONSIVE ── */
@media (max-width: 640px) {
  .site-header { padding: 0 20px; }
  .header-inner { height: 56px; }
  .user-info { display: none; }
  .req-item { flex-direction: column; }
  .req-aside { flex-direction: row; align-items: center; justify-content: space-between; width: 100%; }
  .tool-grid { grid-template-columns: 1fr; }
  .auth-card { padding: 28px 20px; }
}