:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --danger-color: #dc2626;
    --danger-hover: #b91c1c;
    --bg-color: #f3f4f6;
    --card-bg: #ffffff;
    --text-color: #1f2937;
    --border-color: #e5e7eb;
    --success-color: #059669;
}

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

/* Centered Layout (index, auth-failed, port-created) */
body.centered-layout {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}

/* Admin Layout */
body.admin-layout {
    padding: 2rem;
}

.container {
    background-color: var(--card-bg);
    border-radius: 1rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    width: 100%;
}

/* Admin container override (no bg/shadow on container itself, but on card) */
.admin-layout .container {
    background-color: transparent;
    box-shadow: none;
    max-width: 1000px;
    margin: 0 auto;
    padding: 0;
}

.container-sm { max-width: 400px; padding: 2rem; }
.container-md { max-width: 450px; padding: 2rem; }

h1 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    color: #111827;
}

.admin-layout h1 {
    font-size: 1.875rem;
    margin: 0;
}

/* Forms */
.form-group {
    margin-bottom: 1rem;
}

label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
    color: #374151;
}

input {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    font-size: 1rem;
    box-sizing: border-box;
    transition: border-color 0.15s ease-in-out;
}

input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

button, .btn {
    width: 100%;
    padding: 0.75rem;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 0.5rem;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.15s ease-in-out;
    display: inline-block;
    text-decoration: none;
    box-sizing: border-box;
    text-align: center;
}

button:hover, .btn:hover {
    background-color: var(--primary-hover);
}

/* Auth Failed Specifics */
.auth-failed-page {
    --primary-color: #dc2626;
    --primary-hover: #b91c1c;
}

.auth-failed-page h1 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.auth-failed-page p {
    margin-bottom: 1.5rem;
    color: #4b5563;
}

/* Port Created Specifics */
.port-created-page h1 {
    color: var(--success-color);
}

.detail-row {
    display: flex;
    justify-content: space-between;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border-color);
}

.detail-row:last-child {
    border-bottom: none;
}

.label-text {
    font-weight: 500;
    color: #6b7280;
}

.value-text {
    font-weight: 600;
    color: #111827;
}

.highlight {
    color: var(--primary-color);
    font-size: 1.1em;
}

/* Admin Specifics */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

.card {
    background-color: var(--card-bg);
    border-radius: 1rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    overflow: hidden;
}

table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
}

th {
    background-color: #f9fafb;
    padding: 1rem;
    font-weight: 600;
    color: #4b5563;
    border-bottom: 1px solid var(--border-color);
}

td {
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
    color: #1f2937;
}

tr:last-child td {
    border-bottom: none;
}

.btn-danger {
    padding: 0.5rem 1rem;
    background-color: var(--danger-color);
    color: white;
    border: none;
    border-radius: 0.5rem;
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.15s ease-in-out;
    width: auto; /* Override default button width */
}

.btn-danger:hover {
    background-color: var(--danger-hover);
}

.empty-state {
    padding: 3rem;
    text-align: center;
    color: #6b7280;
}

.refresh-btn {
    padding: 0.5rem 1rem;
    background-color: white;
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    color: #374151;
    cursor: pointer;
    font-weight: 500;
    width: auto;
}

.refresh-btn:hover {
    background-color: #f9fafb;
}

/* Login Overlay */
#loginOverlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.login-box {
    background-color: white;
    padding: 2rem;
    border-radius: 1rem;
    width: 100%;
    max-width: 350px;
}

.login-box h2 {
    margin-top: 0;
    text-align: center;
}

.login-box input {
    margin-bottom: 1rem;
}