/* CAIO Upload — Clean, mobile-friendly styles */

:root {
    --bg: #f5f7fa;
    --card: #ffffff;
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --text: #1e293b;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --success: #16a34a;
    --success-bg: #f0fdf4;
    --error: #dc2626;
    --error-bg: #fef2f2;
    --info-bg: #eff6ff;
    --yellow: #ca8a04;
    --yellow-bg: #fefce8;
    --radius: 8px;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.5;
    min-height: 100vh;
}

/* Nav */
nav {
    background: var(--card);
    border-bottom: 1px solid var(--border);
    padding: 0 1rem;
}
.nav-inner {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 56px;
}
.nav-brand {
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--text);
    text-decoration: none;
}
.nav-links {
    display: flex;
    align-items: center;
    gap: 1rem;
}
.nav-links a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.9rem;
}
.nav-links a:hover { color: var(--primary); }
.nav-user {
    color: var(--text-muted);
    font-size: 0.85rem;
}
.btn-logout {
    color: var(--error) !important;
    font-size: 0.85rem !important;
}

/* Layout */
main {
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem 1rem;
}
.container { max-width: 600px; }

h1 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
}

/* Login */
.login-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 80vh;
}
.login-card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 2.5rem 2rem;
    width: 100%;
    max-width: 380px;
    text-align: center;
}
.login-card h1 {
    margin-bottom: 0.25rem;
}
.login-subtitle {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: 2rem;
}

/* Forms */
.form-group {
    margin-bottom: 1.25rem;
    text-align: left;
}
.form-group label {
    display: block;
    font-weight: 600;
    font-size: 0.9rem;
    margin-bottom: 0.35rem;
    color: var(--text);
}
input[type="text"],
input[type="password"],
input[type="file"],
select {
    width: 100%;
    padding: 0.65rem 0.75rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 1rem;
    background: var(--card);
    color: var(--text);
    transition: border-color 0.15s;
}
input:focus, select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}
input[type="file"] {
    padding: 0.5rem;
}
.help-text {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 0.25rem;
}
.checkbox-group label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 400;
    cursor: pointer;
}
.checkbox-group input[type="checkbox"] {
    width: auto;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.65rem 1.5rem;
    border: none;
    border-radius: var(--radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.15s;
}
.btn-primary {
    background: var(--primary);
    color: white;
}
.btn-primary:hover {
    background: var(--primary-hover);
}
.btn-full { width: 100%; }

/* Alerts */
.alert {
    padding: 0.75rem 1rem;
    border-radius: var(--radius);
    margin-bottom: 1.25rem;
    font-size: 0.95rem;
}
.alert-success {
    background: var(--success-bg);
    color: var(--success);
    border: 1px solid #bbf7d0;
}
.alert-error {
    background: var(--error-bg);
    color: var(--error);
    border: 1px solid #fecaca;
}
.alert-info {
    background: var(--info-bg);
    color: var(--primary);
    border: 1px solid #bfdbfe;
}

/* Table */
.table-wrap {
    overflow-x: auto;
}
table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}
th, td {
    text-align: left;
    padding: 0.6rem 0.75rem;
    border-bottom: 1px solid var(--border);
}
th {
    font-weight: 600;
    background: var(--bg);
    color: var(--text-muted);
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

/* Badges */
.badge {
    display: inline-block;
    padding: 0.15rem 0.5rem;
    border-radius: 4px;
    font-size: 0.8rem;
    font-weight: 600;
}
.badge-green {
    background: var(--success-bg);
    color: var(--success);
}
.badge-yellow {
    background: var(--yellow-bg);
    color: var(--yellow);
}

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

/* Mobile */
@media (max-width: 600px) {
    main { padding: 1.25rem 1rem; }
    .login-card { padding: 2rem 1.25rem; }
    .nav-links { gap: 0.5rem; }
    .nav-links a, .nav-user { font-size: 0.8rem; }
    th, td { padding: 0.5rem; font-size: 0.8rem; }
}