:root {
    --bg: #f4f6f8;
    --card: #ffffff;
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --danger: #dc2626;
    --danger-dark: #b91c1c;
    --text: #1f2937;
    --border: #e2e8f0;
    --success-bg: #ecfdf5;
    --success-text: #065f46;
    --error-bg: #fef2f2;
    --error-text: #991b1b;
}

* { box-sizing: border-box; }

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

header {
    background: var(--card);
    border-bottom: 1px solid var(--border);
    padding: 1rem 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

header h1 { margin: 0; font-size: 1.4rem; }

.logout {
    color: var(--danger);
    text-decoration: none;
    font-weight: 600;
}

main {
    max-width: 900px;
    margin: 2rem auto;
    padding: 0 1rem;
}

section {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 1.25rem 1.5rem;
    margin-bottom: 1.5rem;
}

h2 { margin-top: 0; font-size: 1.1rem; }

table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 0.6rem 0.4rem; border-bottom: 1px solid var(--border); }
th { color: #6b7280; font-weight: 600; font-size: 0.85rem; text-transform: uppercase; }
.empty { color: #9ca3af; text-align: center; }

.btn {
    display: inline-block;
    border: none;
    border-radius: 6px;
    padding: 0.4rem 0.8rem;
    margin-right: 0.4rem;
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 600;
    color: white;
    background: var(--primary);
    text-decoration: none;
    line-height: 1.2;
    vertical-align: middle;
}
.btn:hover { background: var(--primary-dark); }
.btn.danger { background: var(--danger); }
.btn.danger:hover { background: var(--danger-dark); }
.btn.download { background: #4b5563; }
.btn.download:hover { background: #374151; }
.btn:disabled { opacity: 0.6; cursor: not-allowed; }

.dropzone {
    border: 2px dashed var(--primary);
    text-align: center;
    padding: 2rem 1rem;
    cursor: pointer;
    color: #4b5563;
    transition: background 0.15s;
}
.dropzone.dragover { background: #eff6ff; }

#flash {
    margin-bottom: 1rem;
}
#flash .msg {
    padding: 0.7rem 1rem;
    border-radius: 8px;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
}
#flash .msg.success { background: var(--success-bg); color: var(--success-text); }
#flash .msg.error { background: var(--error-bg); color: var(--error-text); }

/* Login */
.login-body {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100vh;
}
.login-box {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 2rem;
    width: 300px;
    text-align: center;
}
.login-box h1 { margin-top: 0; font-size: 1.3rem; }
.login-box input {
    width: 100%;
    padding: 0.6rem;
    margin: 1rem 0;
    border: 1px solid var(--border);
    border-radius: 6px;
}
.login-box button {
    width: 100%;
    padding: 0.6rem;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 6px;
    font-weight: 600;
    cursor: pointer;
}
.login-box button:hover { background: var(--primary-dark); }
.login-box .error { color: var(--danger); font-size: 0.85rem; }