/* ============================================================
   ProcessDie Toolbox - Shared Stylesheet
   Engineering tool for stamping / draw dies
   ============================================================ */
:root {
  --primary: #1b5e8a;
  --primary-dark: #144a6f;
  --primary-light: #e8f1f7;
  --accent: #e67e22;
  --accent-dark: #cf6d12;
  --success: #2e8b57;
  --danger: #c0392b;
  --warn: #b9770e;
  --bg: #f4f6f8;
  --card-bg: #ffffff;
  --text: #1f2d3a;
  --text-muted: #5c6b7a;
  --border: #d9e1e8;
  --header-bg: #123a55;
  --header-text: #ffffff;
  --radius: 10px;
  --shadow: 0 2px 8px rgba(18, 58, 85, 0.10);
  --shadow-lg: 0 6px 20px rgba(18, 58, 85, 0.16);
  --font: "Segoe UI", "Helvetica Neue", Arial, "Noto Sans", "PingFang SC", "Microsoft YaHei", sans-serif;
  --mono: "Consolas", "SF Mono", "Menlo", monospace;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { font-size: 16px; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.55;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ---------------- Header ---------------- */
.site-header {
  background: linear-gradient(135deg, var(--header-bg) 0%, #1b5e8a 100%);
  color: var(--header-text);
  box-shadow: 0 2px 10px rgba(0,0,0,0.18);
  position: sticky;
  top: 0;
  z-index: 100;
}
.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 12px 20px;
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: #fff;
}
.brand-logo {
  width: 40px;
  height: 40px;
  border-radius: 8px;
  background: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 20px;
  color: #fff;
  flex-shrink: 0;
}
.header-title-wrap {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-left: 6px;
  margin-right: auto;
  min-width: 0;
}
.header-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: #fff;
  margin: 0;
  line-height: 1.2;
  white-space: nowrap;
}
.header-sub {
  font-size: 0.72rem;
  opacity: 0.85;
  font-weight: 400;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 44vw;
}
@media (max-width: 860px) {
  .header-sub { display: none; }
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  border-radius: 8px;
  border: 1px solid transparent;
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  transition: all 0.15s ease;
  font-family: inherit;
}
.btn-home {
  background: rgba(255,255,255,0.14);
  color: #fff;
  border-color: rgba(255,255,255,0.35);
}
.btn-home:hover { background: rgba(255,255,255,0.26); }
.btn-mail {
  background: var(--accent);
  color: #fff;
}
.btn-mail:hover { background: var(--accent-dark); }

.lang-select {
  padding: 7px 10px;
  border-radius: 8px;
  border: 1px solid rgba(255,255,255,0.4);
  background: rgba(255,255,255,0.12);
  color: #fff;
  font-size: 0.85rem;
  font-family: inherit;
  cursor: pointer;
}
.lang-select option { color: #1f2d3a; background: #fff; }

/* ---------------- Layout ---------------- */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 24px 20px;
  width: 100%;
  flex: 1;
}
.page-title {
  font-size: 1.7rem;
  font-weight: 800;
  color: var(--primary-dark);
  margin-bottom: 4px;
}
.page-desc {
  color: var(--text-muted);
  margin-bottom: 22px;
  max-width: 900px;
}
.breadcrumb {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 14px;
}
.breadcrumb a { color: var(--primary); text-decoration: none; }
.breadcrumb a:hover { text-decoration: underline; }

/* ---------------- Cards ---------------- */
.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 22px;
  margin-bottom: 20px;
}
.card-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--primary-dark);
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.card-title::before {
  content: "";
  width: 4px;
  height: 20px;
  background: var(--accent);
  border-radius: 2px;
}
.card-sub { color: var(--text-muted); font-size: 0.88rem; margin-bottom: 14px; }

/* ---------------- Forms ---------------- */
.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 14px 18px;
}
.form-group { display: flex; flex-direction: column; gap: 5px; }
.form-group label {
  font-size: 0.84rem;
  font-weight: 600;
  color: var(--text);
}
.form-group label .unit { color: var(--text-muted); font-weight: 400; font-size: 0.78rem; }
.form-group input[type="number"],
.form-group input[type="text"],
.form-group select {
  padding: 9px 11px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 0.95rem;
  font-family: inherit;
  background: #fff;
  color: var(--text);
  width: 100%;
  transition: border-color 0.15s;
}
.form-group input:focus, .form-group select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(27, 94, 138, 0.12);
}
.form-hint { font-size: 0.78rem; color: var(--text-muted); }
.form-row { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.radio-group { display: flex; gap: 16px; flex-wrap: wrap; align-items: center; }
.radio-group label { display: inline-flex; align-items: center; gap: 5px; font-weight: 500; font-size: 0.88rem; cursor: pointer; }

/* ---------------- Buttons ---------------- */
.btn-primary {
  background: var(--primary);
  color: #fff;
  padding: 11px 22px;
  font-size: 0.95rem;
  border-radius: 8px;
}
.btn-primary:hover { background: var(--primary-dark); }
.btn-secondary {
  background: #fff;
  color: var(--primary);
  border-color: var(--primary);
}
.btn-secondary:hover { background: var(--primary-light); }
.btn-block { width: 100%; justify-content: center; }
.btn-sm { padding: 6px 10px; font-size: 0.8rem; }

/* ---------------- Results ---------------- */
.result-box {
  background: linear-gradient(135deg, var(--primary-light), #f0f7fb);
  border: 1px solid #cfe0ec;
  border-radius: var(--radius);
  padding: 18px 20px;
  margin-top: 16px;
}
.result-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 12px;
}
.result-item {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 14px;
}
.result-item .r-label { font-size: 0.78rem; color: var(--text-muted); font-weight: 600; text-transform: uppercase; letter-spacing: 0.4px; }
.result-item .r-value { font-size: 1.35rem; font-weight: 800; color: var(--primary-dark); margin-top: 3px; font-family: var(--mono); }
.result-item .r-value .r-unit { font-size: 0.85rem; font-weight: 600; color: var(--text-muted); margin-left: 3px; }
.result-item.highlight .r-value { color: var(--accent-dark); }
.result-item.warn .r-value { color: var(--danger); }
.result-note { font-size: 0.82rem; color: var(--text-muted); margin-top: 12px; }
.result-note strong { color: var(--text); }

/* ---------------- Tables ---------------- */
.table-wrap { overflow-x: auto; margin-top: 10px; }
table.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
}
table.data-table th {
  background: var(--primary);
  color: #fff;
  padding: 9px 12px;
  text-align: left;
  font-weight: 600;
  white-space: nowrap;
}
table.data-table td {
  padding: 8px 12px;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}
table.data-table tr:nth-child(even) td { background: #f7fafc; }
table.data-table tr:hover td { background: var(--primary-light); }
table.data-table td.num { font-family: var(--mono); text-align: right; white-space: nowrap; }
table.data-table th.num { text-align: right; }

/* ---------------- Formula ---------------- */
.formula {
  background: #fbfcfe;
  border: 1px dashed var(--border);
  border-left: 4px solid var(--primary);
  border-radius: 6px;
  padding: 12px 16px;
  margin: 12px 0;
  font-family: var(--mono);
  font-size: 0.95rem;
  color: var(--primary-dark);
  overflow-x: auto;
}
.formula .sym { color: var(--accent-dark); font-weight: 700; }
.formula-note { font-size: 0.8rem; color: var(--text-muted); margin: 4px 0 10px; }

/* ---------------- Reference / info ---------------- */
.info-list { list-style: none; }
.info-list li {
  padding: 7px 0 7px 22px;
  position: relative;
  font-size: 0.9rem;
  border-bottom: 1px solid #eef2f5;
}
.info-list li:last-child { border-bottom: none; }
.info-list li::before {
  content: "▸";
  position: absolute;
  left: 4px;
  color: var(--accent);
  font-weight: 700;
}
.info-list li strong { color: var(--primary-dark); }

/* ---------------- Home page ---------------- */
.hero {
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 60%, #2a7fb0 100%);
  color: #fff;
  border-radius: var(--radius);
  padding: 34px 30px;
  margin-bottom: 26px;
  box-shadow: var(--shadow-lg);
}
.hero h1 { font-size: 1.9rem; font-weight: 800; margin-bottom: 8px; }
.hero p { font-size: 1rem; opacity: 0.92; max-width: 800px; }
.hero .hero-tags { margin-top: 14px; display: flex; gap: 8px; flex-wrap: wrap; }
.hero .tag {
  background: rgba(255,255,255,0.16);
  border: 1px solid rgba(255,255,255,0.3);
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.78rem;
}

.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(270px, 1fr));
  gap: 18px;
}
.tool-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  text-decoration: none;
  color: var(--text);
  box-shadow: var(--shadow);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.tool-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary);
}
.tool-card .tc-icon {
  width: 46px;
  height: 46px;
  border-radius: 10px;
  background: var(--primary-light);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
}
.tool-card .tc-title { font-size: 1.05rem; font-weight: 700; color: var(--primary-dark); }
.tool-card .tc-desc { font-size: 0.84rem; color: var(--text-muted); flex: 1; }
.tool-card .tc-link { font-size: 0.8rem; color: var(--accent); font-weight: 600; }

.section-title {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--primary-dark);
  margin: 30px 0 16px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.section-title::after { content: ""; flex: 1; height: 2px; background: linear-gradient(90deg, var(--border), transparent); }

/* ---------------- Tabs ---------------- */
.tabs { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 18px; }
.tab-btn {
  padding: 8px 16px;
  border: 1px solid var(--border);
  background: #fff;
  border-radius: 8px 8px 0 0;
  cursor: pointer;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-muted);
  font-family: inherit;
}
.tab-btn.active { background: var(--primary); color: #fff; border-color: var(--primary); }
.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* ---------------- Misc ---------------- */
.badge {
  display: inline-block;
  padding: 2px 9px;
  border-radius: 12px;
  font-size: 0.72rem;
  font-weight: 700;
}
.badge-blue { background: var(--primary-light); color: var(--primary); }
.badge-green { background: #e6f4ec; color: var(--success); }
.badge-orange { background: #fdf0e3; color: var(--accent-dark); }
.badge-red { background: #fbeae8; color: var(--danger); }

.text-muted { color: var(--text-muted); }
.text-center { text-align: center; }
.mt-8 { margin-top: 8px; }
.mt-16 { margin-top: 16px; }
.mb-16 { margin-bottom: 16px; }
.hidden { display: none !important; }

.alert {
  padding: 12px 16px;
  border-radius: 8px;
  font-size: 0.88rem;
  margin: 12px 0;
  border: 1px solid;
}
.alert-warn { background: #fdf6e3; border-color: #ecd9a0; color: var(--warn); }
.alert-info { background: var(--primary-light); border-color: #cfe0ec; color: var(--primary-dark); }
.alert-danger { background: #fbeae8; border-color: #ecc9c5; color: var(--danger); }

/* ---------------- Footer ---------------- */
.site-footer {
  background: var(--header-bg);
  color: rgba(255,255,255,0.85);
  padding: 22px 20px;
  margin-top: 30px;
  font-size: 0.85rem;
}
.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}
.footer-inner a { color: #9fd0f0; text-decoration: none; }
.footer-inner a:hover { text-decoration: underline; }

/* ---------------- Responsive ---------------- */
@media (max-width: 720px) {
  .header-inner { padding: 10px 14px; gap: 8px; }
  .brand-name { font-size: 1rem; }
  .brand-sub { display: none; }
  .page-title { font-size: 1.4rem; }
  .hero { padding: 24px 18px; }
  .hero h1 { font-size: 1.5rem; }
  .container { padding: 16px 14px; }
  .card { padding: 16px; }
  .form-grid { grid-template-columns: 1fr; }
  .result-grid { grid-template-columns: 1fr 1fr; }
  .footer-inner { flex-direction: column; text-align: center; }
}
@media (max-width: 420px) {
  .result-grid { grid-template-columns: 1fr; }
  .header-actions .btn { padding: 7px 10px; font-size: 0.8rem; }
}

/* ---------------- Search ---------------- */
.search-wrap { max-width: 640px; margin: 6px auto 0; position: relative; }
.search-wrap .search-ico {
  position: absolute; left: 15px; top: 50%; transform: translateY(-50%);
  color: var(--text-muted); pointer-events: none; width: 18px; height: 18px;
}
.search-wrap input {
  width: 100%; padding: 12px 20px 12px 44px; font-size: 1rem;
  border: 1px solid var(--border); border-radius: 999px; background: var(--card-bg);
  color: var(--text); box-shadow: var(--shadow); outline: none; transition: border-color .15s, box-shadow .15s;
}
.search-wrap input:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(27,94,138,.15); }
.no-result { text-align: center; color: var(--text-muted); padding: 28px 0; font-size: 1rem; }
.dir-tools-link { text-align: center; margin: 6px 0 2px; }
.dir-tools-link a { color: var(--primary); font-weight: 600; text-decoration: none; }
.dir-tools-link a:hover { text-decoration: underline; }