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

:root {
  --primary: #6366f1; --primary-light: #818cf8; --primary-dark: #4f46e5;
  --bg: #f0f4ff; --card-bg: #ffffff; --text: #1e293b;
  --text-muted: #64748b; --border: #e2e8f0; --radius: 16px;
  --shadow: 0 1px 3px rgba(0,0,0,.06); --shadow-hover: 0 8px 30px rgba(99,102,241,.15);
  --transition: all .25s cubic-bezier(.4,0,.2,1);
  --page-padding: 24px;
}

body {
  font-family: -apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,'Noto Sans SC',sans-serif;
  background: var(--bg); color: var(--text); line-height: 1.6;
  background-image: radial-gradient(at 20% 30%, rgba(99,102,241,.04) 0,transparent 50%),
                    radial-gradient(at 80% 70%, rgba(236,72,153,.04) 0,transparent 50%);
  min-height: 100vh;
}

header {
  background: rgba(255,255,255,.8); backdrop-filter: blur(24px) saturate(1.3);
  border-bottom: 1px solid var(--border); position: sticky; top: 0; z-index: 100;
}

/* ===== THE KEY: all content uses same container with same padding ===== */
.container {
  max-width: 1248px;
  margin: 0 auto;
  padding-left: var(--page-padding);
  padding-right: var(--page-padding);
}

/* Header container: same padding as everything else */
.container.header-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
  /* padding-left/right inherited from .container */
}

.logo { display: flex; align-items: center; gap: 12px; font-size: 26px; font-weight: 800; letter-spacing: 1px; flex-shrink: 0; }
.logo-icon { font-size: 32px; }
nav { display: flex; gap: 8px; align-items: center; flex-shrink: 0; }
nav a {
  text-decoration: none; color: var(--text-muted);
  padding: 12px 24px; border-radius: 12px; font-size: 18px; font-weight: 600;
  transition: var(--transition); letter-spacing: .5px;
  border: 2px solid transparent; white-space: nowrap;
}
nav a:hover { background: rgba(99,102,241,.08); color: var(--primary); border-color: rgba(99,102,241,.15); }
nav a.active { background: linear-gradient(135deg, var(--primary), var(--primary-dark)); color: #fff; box-shadow: 0 2px 10px rgba(99,102,241,.3); }

.hero { padding: 64px 0 40px; text-align: center; }
.hero h1 {
  font-size: 44px; font-weight: 800; margin-bottom: 14px;
  background: linear-gradient(135deg,#6366f1,#ec4899,#f59e0b);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero p { color: var(--text-muted); font-size: 19px; margin-bottom: 28px; }
.search-box { max-width: 540px; margin: 0 auto; }
.search-box input { width: 100%; padding: 16px 22px; border: 2px solid var(--border); border-radius: 14px; font-size: 17px; outline: none; background: white; transition: var(--transition); }
.search-box input:focus { border-color: var(--primary); box-shadow: 0 0 0 4px rgba(99,102,241,.12); }

.categories { position: sticky; top: 76px; z-index: 50; background: var(--bg); padding: 8px 0 4px; }
.category-tabs { display: flex; gap: 8px; overflow-x: auto; padding: 4px 0 12px; -webkit-overflow-scrolling: touch; scrollbar-width: none; }
.category-tabs::-webkit-scrollbar { display: none; }
.tab { padding: 9px 20px; border: 2px solid var(--border); border-radius: 22px; background: white; color: var(--text-muted); font-size: 14px; font-weight: 500; cursor: pointer; white-space: nowrap; transition: var(--transition); }
.tab:hover { border-color: var(--primary-light); color: var(--primary); }
.tab.active { background: var(--primary); border-color: var(--primary); color: #fff; }

.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 14px; padding: 4px 0 60px; }

.tool-card {
  background: var(--card-bg); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 22px; display: flex; gap: 16px; align-items: flex-start;
  text-decoration: none; color: var(--text); transition: var(--transition);
  box-shadow: var(--shadow); cursor: pointer;
}
.tool-card:hover { transform: translateY(-3px); border-color: var(--primary-light); box-shadow: var(--shadow-hover); }
.card-icon { width: 52px; height: 52px; border-radius: 14px; background: #f1f5f9; display: flex; align-items: center; justify-content: center; font-size: 24px; flex-shrink: 0; }
.tool-card:hover .card-icon { background: #eef2ff; }
.card-info { flex: 1; min-width: 0; }
.card-info h3 { font-size: 17px; font-weight: 600; margin-bottom: 5px; }
.card-info p { font-size: 14px; color: var(--text-muted); line-height: 1.5; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }

.detail-page { max-width: 800px; margin: 0 auto; padding: 40px 0; }

footer { text-align: center; padding: 40px 0; border-top: 1px solid var(--border); color: var(--text-muted); background: rgba(255,255,255,.5); margin-top: 20px; }
footer p { font-size: 15px; }
.footer-sub { font-size: 12px; margin-top: 4px; opacity: .6; }

@media (max-width: 640px) {
  :root { --page-padding: 16px; }
  .container.header-wrap { flex-direction: column; gap: 4px; padding-top: 8px; padding-bottom: 8px; height: auto; }
  .hero h1 { font-size: 30px; }
  .logo { font-size: 22px; }
  nav a { padding: 10px 16px; font-size: 15px; }
  .grid { grid-template-columns: 1fr; padding-bottom: 40px; }
}