:root {
    --brand: #6EC1E4;
    --brand-dark: #4FA8CE;
    --brand-deep: #245A73;
    --ink: #333;
    --muted: #666;
    --bg: #f4f4f9;
    --card: #ffffff;
    --border: #ddd;
}

* { box-sizing: border-box; }

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

/* Header */
.site-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: var(--card);
    padding: 10px 20px;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.08);
}
.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--ink);
    font-size: 20px;
    font-weight: bold;
}
.brand img { width: 40px; height: auto; }

.content { padding: 20px; max-width: 1100px; margin: 0 auto; }

/* Buttons */
.btn {
    display: inline-block;
    background-color: var(--brand);
    color: white;
    padding: 10px 18px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 15px;
    text-decoration: none;
    text-align: center;
}
.btn:hover { background-color: var(--brand-dark); color: white; }
.btn:active { transform: translateY(1px); }
.btn-secondary { background-color: #555; }
.btn-secondary:hover { background-color: #333; }
.btn-block { display: block; width: 100%; padding: 12px 18px; font-size: 16px; font-weight: 600; }

/* Messages */
.messages { list-style: none; padding: 0; margin: 0 0 16px; }
.message { padding: 10px 14px; border-radius: 4px; margin-bottom: 8px; }
.message.success { background: #e6f4ea; color: #1e7e34; }
.message.error { background: #fdecea; color: #c0392b; }

/* List header (title + search) */
.list-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    margin-bottom: 16px;
}
.list-header h1 { margin: 0; white-space: nowrap; }

/* Search / filter bar */
.filter-container { display: flex; gap: 8px; flex: 1; max-width: 480px; }
.filter-container input[type="text"] {
    flex: 1;
    padding: 10px;
    font-size: 16px;
    border: 1px solid #ccc;
    border-radius: 4px;
}

@media (max-width: 700px) {
    .list-header { flex-direction: column; align-items: stretch; }
    .filter-container { max-width: none; }
}

/* Data table */
.data-table {
    width: 100%;
    border-collapse: collapse;
    background-color: var(--card);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}
.data-table th, .data-table td {
    padding: 12px;
    text-align: left;
    border: 1px solid var(--border);
}
.data-table th { background-color: var(--brand); color: white; }
.data-table tr:nth-child(even) { background-color: #f9f9f9; }
.data-table tr:hover { background-color: #f1f1f1; }
.data-table a { color: var(--brand-dark); font-weight: bold; text-decoration: none; }
.data-table a:hover { text-decoration: underline; }

/* Forms (login, upload) */
.form-card {
    max-width: 420px;
    margin: 60px auto;
    padding: 24px;
    background: var(--card);
    border-radius: 8px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}
.form-card h2 { text-align: center; margin-top: 0; }
.form-card form { display: flex; flex-direction: column; }
.form-card input[type="text"],
.form-card input[type="password"],
.form-card input[type="file"] {
    padding: 12px;
    margin-bottom: 16px;
    border: 1px solid #ccc;
    border-radius: 4px;
    font-size: 16px;
}

/* Auth screen (login) */
body.auth-page {
    background: radial-gradient(circle at 15% 15%, #eaf6fc 0%, var(--bg) 45%),
                linear-gradient(160deg, var(--bg) 0%, #e8f2f7 100%);
    min-height: 100vh;
}
.auth-viewport {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    margin: 0;
    max-width: none;
}
.auth-card {
    width: 100%;
    max-width: 380px;
    background: var(--card);
    border-radius: 16px;
    padding: 40px 36px;
    box-shadow: 0 24px 48px -20px rgba(36, 90, 115, 0.35), 0 2px 6px rgba(0, 0, 0, 0.06);
    animation: auth-card-in 0.4s ease-out;
}
.auth-brand {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    margin-bottom: 28px;
}
.auth-brand img { width: 36px; height: auto; }
.auth-brand span {
    font-size: 14px;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--brand-deep);
}
.auth-heading {
    margin: 0 0 6px;
    font-size: 24px;
    font-weight: 700;
    text-align: center;
    color: var(--ink);
}
.auth-subheading {
    margin: 0 0 24px;
    font-size: 14px;
    text-align: center;
    color: var(--muted);
}
.auth-alert {
    margin: 0 0 20px;
    padding: 10px 14px;
    border-radius: 8px;
    border-left: 3px solid #c0392b;
    background: #fdecea;
    color: #c0392b;
    font-size: 14px;
}
.auth-form { display: flex; flex-direction: column; }
.auth-field { margin-bottom: 18px; }
.auth-field label {
    display: block;
    margin-bottom: 6px;
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: var(--muted);
}
.auth-form input[type="text"],
.auth-form input[type="password"] {
    width: 100%;
    padding: 12px 14px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 15px;
    background: var(--card);
    transition: border-color 0.15s ease, box-shadow 0.15s ease;
}
.auth-form input[type="text"]:focus,
.auth-form input[type="password"]:focus {
    outline: none;
    border-color: var(--brand);
    box-shadow: 0 0 0 3px rgba(110, 193, 228, 0.28);
}
.auth-form .btn-block { margin-top: 6px; }
@keyframes auth-card-in {
    from { opacity: 0; transform: translateY(12px); }
    to { opacity: 1; transform: translateY(0); }
}
@media (prefers-reduced-motion: reduce) {
    .auth-card { animation: none; }
}

/* Error pages */
.error-page { text-align: center; margin-top: 80px; }
.error-page h1 { font-size: 64px; margin-bottom: 8px; color: var(--brand); }
.error-page p { color: var(--muted); margin-bottom: 24px; }

/* Pagination */
.pagination { display: flex; gap: 6px; justify-content: center; margin: 20px 0; flex-wrap: wrap; }
.pagination a, .pagination .current {
    padding: 8px 12px;
    border: 1px solid var(--border);
    border-radius: 4px;
    text-decoration: none;
    color: var(--ink);
    background: var(--card);
}
.pagination .current { background: var(--brand); color: white; border-color: var(--brand); }
.results-summary { color: var(--muted); margin: 8px 0; }

/* Mobile: collapse table into cards */
@media (max-width: 700px) {
    .content { padding: 12px; }
    .data-table thead { display: none; }
    .data-table, .data-table tbody, .data-table tr, .data-table td { display: block; width: 100%; }
    .data-table tr {
        margin-bottom: 12px;
        border: 1px solid var(--border);
        border-radius: 8px;
        padding: 6px 0;
    }
    .data-table td { border: none; padding: 6px 16px; }
    .data-table td::before {
        content: attr(data-label);
        display: block;
        font-weight: bold;
        color: var(--muted);
        font-size: 12px;
        text-transform: uppercase;
    }
}