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

:root {
    --color-primary: #007BFF;
    --color-accent: #007BFF;
    --color-bg: #fff;
    --color-text: #1a1a2e;
    --color-nav-bg: #007BFF;
    --font-base: system-ui, sans-serif;
}

body {
    font-family: var(--font-base);
    background-color: var(--color-bg);
    color: var(--color-text);
    min-height: 100dvh;
    display: flex;
    flex-direction: column;
}

/* ── Navigation ── */
header {
    background-color: #fff;
    padding: 0 2rem;
}

nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: 1100px;
    margin: 0 auto;
    height: 60px;
}

nav .logo {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    text-decoration: none;
    color: var(--color-primary);
    font-size: 1.25rem;
    font-weight: 700;
}

nav .logo img {
    height: 40px;
    width: auto;
    display: block;
}

nav ul {
    list-style: none;
    display: flex;
    gap: 1.5rem;
}

nav ul a {
    color: var(--color-primary);
    text-decoration: none;
    font-size: 0.95rem;
    transition: color 0.2s;
}

nav ul a:hover {
    color: var(--color-accent);
}

nav ul li {
    display: flex;
    align-items: center;
}

.nav-hamburger {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1.5rem;
    color: var(--color-primary);
    padding: 0.25rem;
    line-height: 1;
}

@media (max-width: 768px) {
    nav {
        position: relative;
        flex-wrap: wrap;
        height: auto;
        padding: 0.75rem 0;
    }

    .nav-hamburger {
        display: block;
    }

    nav ul {
        display: none;
        flex-direction: column;
        width: 100%;
        gap: 0.75rem;
        padding: 0.75rem 0;
    }

    nav ul.open {
        display: flex;
    }
}

/* ── Main content ── */
main {
    flex: 1;
    max-width: 1100px;
    width: 100%;
    margin: 0 auto;
    padding: 2rem;
}

/* ── Hero ── */
.hero {
    text-align: center;
    padding: 4rem 1rem;
}

.hero h1 {
    font-size: clamp(2.5rem, 5vw, 3rem);
    color: var(--color-primary);
    margin-bottom: 1rem;
}

.hero p {
    font-size: 1.15rem;
    color: #444;
}

/* ── Home intro ── */
.intro {
    max-width: 680px;
    margin: 0 auto 2.5rem;
    text-align: center;
    font-size: 1.1rem;
    color: #444;
    line-height: 1.7;
}

/* ── CTA button row ── */
.cta-center {
    text-align: center;
    margin-bottom: 3rem;
}

.btn-lg {
    padding: 0.75rem 2rem;
    font-size: 1.05rem;
}

/* ── Feature cards ── */
.features {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.feature-card {
    background: #f0f7ff;
    border-radius: 10px;
    padding: 1.75rem 1.5rem;
}

.feature-card h3 {
    color: var(--color-primary);
    margin-bottom: 0.75rem;
    font-size: 1.05rem;
}

.feature-card p {
    font-size: 0.95rem;
    color: #444;
    line-height: 1.6;
}

@media (max-width: 680px) {
    .features {
        grid-template-columns: 1fr;
    }
}

/* ── FAQ ── */
.faq {
    margin-bottom: 3rem;
}

.faq h2 {
    color: var(--color-primary);
    margin-bottom: 1.25rem;
}

.faq-item {
    /* background: #f0f7ff; */
    border-radius: 10px;
    padding: 1.5rem;
    margin-bottom: 1rem;
}

.faq-item h3 {
    color: var(--color-primary);
    margin-bottom: 0.5rem;
    font-size: 1.05rem;
}

.faq-item p {
    font-size: 0.95rem;
    color: #444;
    line-height: 1.6;
    margin: 0;
}

/* ── Footer ── */
footer {
    background-color: #cce7f0;
    color: var(--color-primary);
    padding: 0rem 2rem;
    font-size: 0.7rem;
}

.footer-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1100px;
    margin: 0 auto;
}

.footer-brand {
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
}

.footer-brand strong {
    font-size: 1rem;
}

.footer-links {
    display: flex;
    gap: 1.5rem;
}

.footer-links a {
    color: var(--color-primary);
    text-decoration: none;
}

.footer-links a:hover {
    text-decoration: underline;
}

/* ── Changelog ── */
.changelog {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    margin-top: 1rem;
}

.changelog-entry {
    border-left: 3px solid var(--color-primary);
    padding-left: 1rem;
}

.changelog-date {
    display: block;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 0.4rem;
}

.changelog-entry ul {
    padding-left: 1.2rem;
}

.changelog-entry li {
    margin-bottom: 0.25rem;
}

/* ── Form section ── */
.form-section {
    max-width: 480px;
    margin: 2rem auto;
}

.form-section h1 {
    margin-bottom: 1.5rem;
    color: var(--color-primary);
}

.form-section h2 {
    margin-top: 1.5rem;
    margin-bottom: 0.5rem;
    color: var(--color-primary);
}

.form-section p {
    margin-bottom: 0.75rem;
    line-height: 1.6;
}

.form-group {
    display: flex;
    flex-direction: column;
    margin-bottom: 1rem;
}

.form-group label {
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 0.3rem;
}

.form-group input,
.form-group textarea {
    padding: 0.55rem 0.75rem;
    border: 1px solid #b0bec5;
    border-radius: 6px;
    font-size: 0.95rem;
    font-family: var(--font-base);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(0, 180, 216, 0.2);
}

.form-error {
    background: #fde8e8;
    color: #c0392b;
    border: 1px solid #f5c6cb;
    border-radius: 6px;
    padding: 0.6rem 0.9rem;
    margin-bottom: 1rem;
    font-size: 0.9rem;
}

.form-footer {
    margin-top: 1rem;
    font-size: 0.9rem;
    color: #555;
    text-align: center;
}

/* ── Buttons ── */
button[type="submit"],
.btn {
    display: inline-block;
    padding: 0.55rem 1.2rem;
    background-color: var(--color-primary);
    color: #fff;
    border: none;
    border-radius: 6px;
    font-size: 0.95rem;
    font-family: var(--font-base);
    cursor: pointer;
    text-decoration: none;
    transition: background-color 0.2s;
}

button[type="submit"]:hover,
.btn:hover {
    background-color: var(--color-accent);
}

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

.btn-sm {
    padding: 0.35rem 0.8rem;
    font-size: 0.85rem;
}

.btn-success {
    background-color: #27ae60;
}

.btn-success:hover {
    background-color: #2ecc71;
}

.btn-danger {
    background-color: #c0392b;
}

.btn-danger:hover {
    background-color: #e74c3c;
}

/* ── Page header (title + action button) ── */
.page-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.page-header h1 {
    color: var(--color-primary);
    font-size: 1.8rem;
}

/* ── Card grid ── */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.25rem;
}

.card {
    background: #fff;
    border-radius: 10px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.card-body {
    padding: 1.2rem 1.2rem 0.8rem;
    flex: 1;
}

.card-title {
    font-size: 1.15rem;
    color: var(--color-primary);
    margin-bottom: 0.4rem;
}

.card-meta {
    font-size: 0.88rem;
    color: #555;
    margin-top: 0.25rem;
}

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

.card-meta a:hover {
    text-decoration: underline;
}

.card-footer {
    padding: 0.75rem 1.2rem;
    border-top: 1px solid #eee;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-wrap: wrap;
}

/* ── Badges ── */
.badge {
    display: inline-block;
    padding: 0.25rem 0.65rem;
    border-radius: 999px;
    font-size: 0.78rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.badge-admin {
    background: #fff3cd;
    color: #856404;
}

.badge-member {
    background: #d1f0e0;
    color: #1a6b3a;
}

.badge-pending {
    background: #dce8ff;
    color: #2255a4;
}

/* ── Join requests panel ── */
.card-requests {
    padding: 0.85rem 1.2rem;
    border-top: 1px solid #eee;
    background: #f8fafc;
}

.card-requests h3 {
    font-size: 0.9rem;
    font-weight: 600;
    color: #444;
    margin-bottom: 0.6rem;
}

.request-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.request-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 0.5rem;
    font-size: 0.88rem;
}

.request-email {
    color: #777;
}

.request-actions {
    display: flex;
    gap: 0.4rem;
}

/* ── Nav logout button ── */
.nav-user {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--color-primary);
    font-size: 0.95rem;
}

.nav-logout {
    background: none;
    border: none;
    color: var(--color-primary);
    font-size: 0.95rem;
    font-family: inherit;
    cursor: pointer;
    padding: 0;
}

.nav-logout:hover {
    color: var(--color-accent);
}

.btn-link {
    background: none;
    border: none;
    color: var(--color-primary);
    font-size: inherit;
    font-family: inherit;
    cursor: pointer;
    padding: 0;
    text-decoration: underline;
}

.btn-link:hover {
    color: var(--color-accent);
}

/* ── Empty state ── */
.empty-state {
    color: #777;
    font-style: italic;
    margin-top: 1rem;
}

/* ── Dive cards ── */
.dive-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 0.5rem;
    margin-bottom: 0.4rem;
}

.badge-open {
    background: #d1f0e0;
    color: #1a6b3a;
    flex-shrink: 0;
}

.badge-club {
    background: #fff3cd;
    color: #856404;
    flex-shrink: 0;
}

.badge-locked {
    background: #f0e6ff;
    color: #5b2d8e;
    flex-shrink: 0;
}

.dive-notes {
    font-size: 0.88rem;
    color: #555;
    margin-top: 0.5rem;
    font-style: italic;
}

.dive-club-note {
    color: #856404;
    font-weight: 500;
}

.participant-count {
    font-size: 0.88rem;
    color: #555;
    flex: 1;
}

.join-form {
    display: flex;
    gap: 0.4rem;
    align-items: center;
    flex-wrap: wrap;
}

.join-password-input {
    padding: 0.35rem 0.6rem;
    border: 1px solid #b0bec5;
    border-radius: 6px;
    font-size: 0.85rem;
    width: 130px;
}

.join-password-input:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(0, 180, 216, 0.2);
}

/* ── Form extras ── */
.form-fieldset {
    border: 1px solid #dde3ea;
    border-radius: 8px;
    padding: 0.9rem 1rem 0.5rem;
    margin-bottom: 1rem;
}

.form-fieldset legend {
    font-size: 0.85rem;
    font-weight: 600;
    color: #555;
    padding: 0 0.3rem;
}

.form-group select {
    padding: 0.55rem 0.75rem;
    border: 1px solid #b0bec5;
    border-radius: 6px;
    font-size: 0.95rem;
    font-family: var(--font-base);
    background: #fff;
}

.form-group select:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(0, 180, 216, 0.2);
}

.field-optional {
    font-weight: 400;
    color: #777;
    font-size: 0.82rem;
}

.field-hint {
    font-size: 0.8rem;
    color: #777;
    margin-top: 0.25rem;
}