:root {
  color-scheme: light dark;
  --bg: #f5f6f8;
  --panel: #ffffff;
  --text: #1c1e21;
  --muted: #6b7280;
  --border: #e2e4e9;
  --accent: #1f4e78;
  --accent-text: #ffffff;
  --error-bg: #fdecea;
  --error-text: #92140c;
  --ok-bg: #eaf7ee;
  --ok-text: #14532d;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14161a;
    --panel: #1d2025;
    --text: #e7e9ec;
    --muted: #9aa0a8;
    --border: #2c2f36;
    --accent: #4d8fc4;
    --accent-text: #0b1220;
    --error-bg: #3a1613;
    --error-text: #f5a9a1;
    --ok-bg: #133020;
    --ok-text: #a8e6bd;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
}

.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 24px 20px 60px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 24px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
}

.topbar .brand {
  font-weight: 700;
  color: var(--text);
  text-decoration: none;
}

.topbar nav a, .topbar nav span {
  margin-left: 16px;
  color: var(--muted);
  text-decoration: none;
  font-size: 0.95rem;
}

.topbar nav a:hover { color: var(--accent); }

h1 { font-size: 1.6rem; margin-bottom: 4px; }

.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 16px;
  margin-top: 20px;
}

.tool-card {
  display: block;
  padding: 18px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  text-decoration: none;
  color: var(--text);
  transition: border-color .15s ease;
}

.tool-card:hover { border-color: var(--accent); }
.tool-card h2 { margin: 0 0 8px; font-size: 1.1rem; }
.tool-card p { margin: 0; color: var(--muted); font-size: 0.9rem; }

.tool-desc { color: var(--muted); margin-bottom: 20px; }

.upload-form, .login-card form {
  display: flex;
  flex-direction: column;
  gap: 14px;
  max-width: 420px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px;
}

.upload-form label, .login-card label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 0.9rem;
  color: var(--muted);
}

input[type="file"], input[type="text"], input[type="password"] {
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg);
  color: var(--text);
  font-size: 0.95rem;
}

button {
  padding: 10px 16px;
  border: none;
  border-radius: 6px;
  background: var(--accent);
  color: var(--accent-text);
  font-weight: 600;
  cursor: pointer;
  width: fit-content;
}

button:hover { opacity: 0.9; }

.login-card {
  max-width: 380px;
  margin: 60px auto;
  text-align: center;
}

.result-card {
  margin-top: 24px;
  padding: 18px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  max-width: 480px;
}

.summary-table { width: 100%; border-collapse: collapse; margin-bottom: 16px; }
.summary-table th, .summary-table td {
  text-align: left;
  padding: 6px 4px;
  border-bottom: 1px solid var(--border);
  font-size: 0.9rem;
}
.summary-table th { color: var(--muted); font-weight: 500; }

.download-btn {
  display: inline-block;
  padding: 10px 16px;
  background: var(--accent);
  color: var(--accent-text);
  border-radius: 6px;
  text-decoration: none;
  font-weight: 600;
}

.history-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
}

.history-table th, .history-table td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  font-size: 0.9rem;
  text-align: left;
}

.history-table tr.status-hata td { color: var(--error-text); }

.flash {
  padding: 10px 14px;
  border-radius: 6px;
  margin-bottom: 16px;
  font-size: 0.9rem;
}

.flash-error { background: var(--error-bg); color: var(--error-text); }
.flash-message { background: var(--ok-bg); color: var(--ok-text); }

.empty { color: var(--muted); }