:root {
    --color-light:    #e2eded;
    --color-dark:     #173344;
    --color-accent:   #85ad86;
    --color-white:    #ffffff;
    --color-error:    #c0392b;
    --color-success:  #27ae60;
    --radius:         8px;
    --shadow:         0 2px 6px rgba(23, 51, 68, 0.08);
    --font-sans:      'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

* {
    box-sizing: border-box;
}

html {
    font-size: 16px;
}

body {
    margin: 0;
    font-family: var(--font-sans);
    background-color: var(--color-light);
    color: var(--color-dark);
    display: flex;
    min-height: 100vh;
    line-height: 1.5;
}

h1, h2, h3, h4, h5, h6 {
    color: var(--color-dark);
    margin-top: 0;
}

a {
    color: var(--color-accent);
    text-decoration: none;
}

a:hover,
a:focus {
    text-decoration: underline;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 1.25rem;
    border: none;
    border-radius: var(--radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    text-align: center;
    text-decoration: none;
    transition: background-color 0.2s ease, transform 0.1s ease;
}

.btn:hover,
.btn:focus {
    text-decoration: none;
    transform: translateY(-1px);
}

.btn:active {
    transform: translateY(0);
}

.btn-primary {
    background-color: var(--color-dark);
    color: var(--color-light);
}

.btn-primary:hover,
.btn-primary:focus {
    background-color: #0f2431;
}

.btn-accent {
    background-color: var(--color-accent);
    color: var(--color-dark);
}

.btn-accent:hover,
.btn-accent:focus {
    background-color: #6f966f;
}

.btn-share {
    background-color: transparent;
    color: var(--color-dark);
    border: 2px solid var(--color-dark);
}

.btn-share:hover,
.btn-share:focus {
    background-color: var(--color-dark);
    color: var(--color-light);
}

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

.btn-danger:hover,
.btn-danger:focus {
    background-color: #a93226;
}

.btn-secondary {
    background-color: transparent;
    color: var(--color-dark);
    border: 2px solid var(--color-dark);
}

.btn-secondary:hover,
.btn-secondary:focus {
    background-color: var(--color-dark);
    color: var(--color-light);
}

/* Forms */
label {
    display: block;
    margin-bottom: 0.4rem;
    font-weight: 600;
    color: var(--color-dark);
}

fieldset {
    border: 1px solid var(--color-dark);
    border-radius: var(--radius);
    padding: 1rem 1.25rem;
    margin: 0 0 1.25rem 0;
}

fieldset legend {
    padding: 0 0.5rem;
    font-weight: 700;
    color: var(--color-dark);
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="number"],
select,
textarea {
    width: 100%;
    padding: 0.75rem 1rem;
    margin-bottom: 1rem;
    border: 1px solid rgba(23, 51, 68, 0.2);
    border-radius: var(--radius);
    background-color: var(--color-white);
    color: var(--color-dark);
    font-family: var(--font-sans);
    font-size: 1rem;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

input[type="text"]:focus,
input[type="email"]:focus,
input[type="password"]:focus,
input[type="number"]:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(133, 173, 134, 0.25);
}

input[readonly] {
    background-color: rgba(23, 51, 68, 0.05);
    cursor: text;
}

textarea {
    resize: vertical;
    min-height: 120px;
}

/* Form errors and messages */
.form-errors,
.form-success {
    list-style: none;
    margin: 0 0 1.25rem;
    padding: 1rem 1.25rem;
    border-radius: var(--radius);
}

.form-errors {
    background-color: rgba(192, 57, 43, 0.08);
    color: var(--color-error);
    border-left: 4px solid var(--color-error);
}

.form-success {
    background-color: rgba(39, 174, 96, 0.08);
    color: var(--color-success);
    border-left: 4px solid var(--color-success);
}

.form-errors li,
.form-success li {
    margin-bottom: 0.25rem;
}

/* Auth boxes */
.auth-box,
.profile-box,
.settings-box {
    max-width: 480px;
    margin: 0 auto;
    padding: 2rem;
    background-color: var(--color-white);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.auth-box h1,
.profile-box h1,
.settings-box h1 {
    margin-bottom: 0.5rem;
}

.auth-box p,
.profile-box p,
.settings-box p {
    margin-top: 0;
    margin-bottom: 1.5rem;
    opacity: 0.85;
}

.auth-box form button[type="submit"],
.auth-box form input[type="submit"] {
    width: 100%;
    margin-top: 0.5rem;
}

.auth-links {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid rgba(23, 51, 68, 0.1);
}

.auth-links a {
    color: var(--color-dark);
    font-weight: 600;
}

.auth-links a:hover,
.auth-links a:focus {
    color: var(--color-accent);
}

/* Admin dashboard */
.admin-box {
    max-width: 900px;
    margin: 0 auto;
    padding: 2rem;
    background-color: var(--color-white);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.admin-tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
    border-bottom: 1px solid rgba(23, 51, 68, 0.1);
}

.admin-tabs a {
    display: inline-block;
    padding: 0.75rem 1.25rem;
    border-radius: var(--radius) var(--radius) 0 0;
    font-weight: 600;
    color: var(--color-dark);
}

.admin-tabs a.active,
.admin-tabs a:hover,
.admin-tabs a:focus {
    background-color: rgba(133, 173, 134, 0.15);
    color: var(--color-dark);
}

.admin-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.95rem;
}

.admin-table th,
.admin-table td {
    padding: 0.75rem 1rem;
    text-align: left;
    border-bottom: 1px solid rgba(23, 51, 68, 0.1);
}

.admin-table th {
    font-weight: 700;
    background-color: rgba(23, 51, 68, 0.04);
}

.admin-inline-form {
    display: flex;
    gap: 0.5rem;
    align-items: center;
    flex-wrap: wrap;
}

.admin-inline-form select {
    width: auto;
    margin-bottom: 0;
    padding: 0.5rem;
}

.admin-inline-form button {
    padding: 0.5rem 0.75rem;
    font-size: 0.85rem;
}

/* Game grid and cards */
.game-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.game-card {
    background-color: var(--color-white);
    border-radius: var(--radius);
    padding: 1.5rem;
    box-shadow: var(--shadow);
    display: flex;
    flex-direction: column;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.game-card:hover,
.game-card:focus-within {
    transform: translateY(-3px);
    box-shadow: 0 4px 12px rgba(23, 51, 68, 0.12);
}

.game-card h2 {
    margin-bottom: 0.5rem;
    font-size: 1.4rem;
}

.game-card p {
    flex: 1;
    margin-bottom: 1rem;
    opacity: 0.85;
}

.game-badge {
    display: inline-block;
    padding: 0.25rem 0.6rem;
    border-radius: 999px;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    background-color: var(--color-dark);
    color: var(--color-light);
    margin-bottom: 0.75rem;
    width: fit-content;
}

.game-badge-solo {
    background-color: var(--color-accent);
    color: var(--color-dark);
}

.game-actions {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}

/* Game play / share */
.game-frame {
    background-color: var(--color-white);
    border-radius: var(--radius);
    padding: .5rem;
    box-shadow: var(--shadow);
    margin-bottom: 1.5rem;
}

.game-share-box {
    background-color: var(--color-white);
    border-radius: var(--radius);
    padding: 1.5rem;
    box-shadow: var(--shadow);
    margin-bottom: 1.5rem;
}

.game-share-box > p {
    margin: 0 0 1rem 0;
    color: var(--color-dark);
    font-weight: 600;
}


/* Invite list */
.invite-list {
    list-style: none;
    padding: 0;
    margin: 2rem 0 0;
}

.invite-item {
    background-color: var(--color-white);
    border-radius: var(--radius);
    padding: 1rem 1.5rem;
    margin-bottom: 1rem;
    box-shadow: var(--shadow);
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.invite-item input {
    flex: 1;
    min-width: 220px;
    margin-bottom: 0;
}

.invite-status {
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
}

.invite-status-active {
    background-color: rgba(39, 174, 96, 0.15);
    color: var(--color-success);
}

.invite-status-used {
    background-color: rgba(23, 51, 68, 0.08);
    color: var(--color-dark);
}

/* Notice boxes */
.notice {
    background-color: var(--color-white);
    border-radius: var(--radius);
    padding: 1.5rem;
    box-shadow: var(--shadow);
    margin-bottom: 1.5rem;
}

.notice-info {
    border-left: 4px solid var(--color-accent);
}

/* Utility */
.text-center {
    text-align: center;
}

.mt-1 { margin-top: 1rem; }
.mt-2 { margin-top: 2rem; }
.mb-1 { margin-bottom: 1rem; }
.mb-2 { margin-bottom: 2rem; }