:root {
  --bg: #fafafa;
  --card: #ffffff;
  --text: #222;
  --muted: #666;
  --primary: #e74c3c;
  --border: #eee;
}

* {
  box-sizing: border-box;
}

/* Tambahan untuk sticky footer */
html, body {
  height: 100%;
  display: flex;
  flex-direction: column;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, 'Helvetica Neue', Arial, sans-serif;
  color: var(--text);
  background: linear-gradient(180deg, #fff, #f7f7f7);
}

main {
  flex: 1;
}

/* ===== HEADER ===== */
.site-header {
  padding: 16px;
  border-bottom: 1px solid var(--border);
  background: #fff;
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  gap: 12px;
  align-items: center;
}

.brand .logo {
  font-size: 32px;
}

.brand h1 {
  margin: 0;
  font-size: 20px;
}

.brand p {
  margin: 0;
  color: var(--muted);
  font-size: 12px;
}

/* ===== NAVIGATION ===== */
.site-nav {
  display: flex;
  align-items: center;
  gap: 16px;
}

.site-nav a {
  text-decoration: none;
  color: var(--text);
  font-size: 14px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.site-nav a:hover {
  color: var(--primary);
}

.btn-login,
.btn-register {
  padding: 8px 14px;
  border-radius: 8px;
  font-weight: 500;
}

.btn-login {
  background: transparent;
  border: 1px solid var(--primary);
  color: var(--primary);
}

.btn-register {
  background: var(--primary);
  color: #fff;
  border: none;
}

.menu-toggle {
  display: none;
  font-size: 22px;
  background: none;
  border: none;
  cursor: pointer;
}

/* ===== CONTAINER ===== */
.container {
  max-width: 1100px;
  margin: 24px auto;
  padding: 0 16px;
}

/* ===== TABS ===== */
.tabs {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}

.tab {
  background: #fff;
  border: 1px solid var(--border);
  padding: 8px 12px;
  border-radius: 999px;
  cursor: pointer;
}

.tab.active {
  background: var(--text);
  color: #fff;
}

/* ===== GRID ===== */
.grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

@media (max-width: 1000px) {
  .grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 720px) {
  .grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 480px) {
  .grid {
    grid-template-columns: 1fr;
  }
}

/* ===== CARD ===== */
.card {
  display: block;
  background: var(--card);
  padding: 18px;
  border: 1px solid var(--border);
  border-radius: 14px;
  text-decoration: none;
  color: inherit;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.04);
  transition: all 0.2s ease;
}

.card:hover {
  border-color: #ddd;
  transform: translateY(-2px);
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.08);
}

.card h3 {
  margin: 0 0 8px 0;
}

.card p {
  margin: 0;
  color: var(--muted);
}

/* ===== FOOTER ===== */
.site-footer {
  padding: 24px 16px;
  border-top: 1px solid var(--border);
  text-align: center;
  color: var(--muted);
  margin-top: auto;
}

/* ===== RESPONSIVE MENU ===== */
@media (max-width: 768px) {
  .site-nav {
    display: none;
    flex-direction: column;
    position: absolute;
    top: 64px;
    right: 16px;
    background: white;
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 12px;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.1);
  }

  .site-nav.open {
    display: flex;
  }

  .menu-toggle {
    display: block;
  }
}

/* ===== TOOL PAGE ===== */
.tool-page {
  max-width: 500px;
  margin: 50px auto;
  background: var(--card);
  padding: 25px;
  border-radius: 10px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.06);
  text-align: center;
}

.tool-page h2 {
  margin-bottom: 20px;
  color: var(--text);
}

.file-drop {
  display: block;
  padding: 20px;
  border: 2px dashed var(--border);
  border-radius: 8px;
  background: #fafafa;
  cursor: pointer;
  margin-bottom: 15px;
  transition: border-color 0.3s;
}

.file-drop:hover {
  border-color: var(--primary);
}

.file-drop span {
  color: var(--muted);
  font-size: 14px;
}

input[type="file"] {
  display: none;
}

.btn {
  background: var(--primary);
  color: #fff;
  border: none;
  padding: 10px 18px;
  border-radius: 5px;
  cursor: pointer;
  font-size: 14px;
  transition: background 0.3s;
}

.btn:hover {
  background: #c0392b;
}

.flash {
  margin-top: 15px;
  padding: 10px;
  background: #ffe6e6;
  color: #b30000;
  list-style: none;
  border-radius: 5px;
  font-size: 13px;
  text-align: left;
}

.link {
  display: inline-block;
  margin-top: 20px;
  color: var(--primary);
  text-decoration: none;
  font-size: 14px;
}

.link:hover {
  text-decoration: underline;
}