/* ── Reset & Base ─────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
    --navy: #023760;
    --navy-dark: #011e38;
    --blue: #059bda;
    --blue-light: #3db8eb;
    --blue-glow: rgba(5, 155, 218, 0.25);
    --bg: #f4f7fa;
    --card-bg: #ffffff;
    --text: #1a2a3a;
    --text-muted: #5a6a7a;
    --border: #dfe6ed;
    --radius: 12px;
    --radius-sm: 8px;
    --shadow: 0 2px 12px rgba(2, 55, 96, 0.08);
    --shadow-lg: 0 8px 32px rgba(2, 55, 96, 0.12);
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* ── Hero Header ──────────────────────────────────────── */
.hero {
    background: linear-gradient(135deg, var(--navy-dark) 0%, var(--navy) 50%, #04567a 100%);
    padding: 3rem 2rem 3.5rem;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(5, 155, 218, 0.15) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(5, 155, 218, 0.1) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 700px;
    margin: 0 auto;
}

.hero-logo {
    width: 140px;
    height: auto;
    margin-bottom: 1rem;
    filter: brightness(0) invert(1);
    opacity: 0.95;
    transition: opacity var(--transition);
}

.hero-logo:hover { opacity: 1; }

.hero h1 {
    color: #ffffff;
    font-size: 1.75rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 0.5rem;
}

.hero p {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.95rem;
}

/* ── Container ────────────────────────────────────────── */
.container {
    max-width: 860px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* ── About Section ────────────────────────────────────── */
.about {
    margin-top: -1.5rem;
    position: relative;
    z-index: 2;
}

.card {
    background: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 1.75rem;
    border: 1px solid var(--border);
}

.about .card {
    box-shadow: var(--shadow-lg);
}

.about p {
    color: var(--text-muted);
    font-size: 0.95rem;
    line-height: 1.7;
}

.about a {
    color: var(--blue);
    text-decoration: none;
    font-weight: 500;
    transition: color var(--transition);
}

.about a:hover {
    color: var(--blue-light);
    text-decoration: underline;
}

/* ── Info Banner ──────────────────────────────────────── */
.info-banner {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    background: linear-gradient(135deg, rgba(5, 155, 218, 0.08), rgba(5, 155, 218, 0.04));
    border: 1px solid rgba(5, 155, 218, 0.2);
    border-radius: var(--radius-sm);
    padding: 1rem 1.25rem;
    margin-top: 2rem;
    font-size: 0.9rem;
}

.info-banner .icon {
    flex-shrink: 0;
    width: 36px;
    height: 36px;
    background: var(--blue);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.1rem;
}

.info-banner strong { color: var(--navy); }

/* ── User Selector Card ───────────────────────────────── */
.selector-section {
    margin-top: 2rem;
}

.selector-section h2 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--navy);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.selector-section h2 .dot {
    width: 8px;
    height: 8px;
    background: var(--blue);
    border-radius: 50%;
    display: inline-block;
}

.user-select {
    width: 100%;
    padding: 0.75rem 1rem;
    font-family: inherit;
    font-size: 0.95rem;
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--card-bg);
    color: var(--text);
    cursor: pointer;
    transition: border-color var(--transition), box-shadow var(--transition);
    appearance: none;
    -webkit-appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%235a6a7a' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 1rem center;
}

.user-select:focus {
    outline: none;
    border-color: var(--blue);
    box-shadow: 0 0 0 4px var(--blue-glow);
}

/* ── Connection Details ────────────────────────────────── */
.connection-details {
    display: none;
    margin-top: 1.25rem;
    animation: slideDown 0.3s ease-out;
}

.connection-details.visible {
    display: block;
}

@keyframes slideDown {
    from { opacity: 0; transform: translateY(-8px); }
    to   { opacity: 1; transform: translateY(0); }
}

.conn-item {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
    padding: 0.85rem 1rem;
    background: var(--bg);
    border-radius: var(--radius-sm);
    margin-bottom: 0.6rem;
    border: 1px solid var(--border);
    transition: border-color var(--transition);
}

.conn-item:hover {
    border-color: var(--blue);
}

.conn-label {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--text-muted);
}

.conn-value {
    font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
    font-size: 0.85rem;
    color: var(--navy);
    cursor: pointer;
    position: relative;
    word-break: break-all;
    padding: 0.4rem 0.6rem;
    background: var(--card-bg);
    border-radius: 4px;
    border: 1px dashed var(--border);
    transition: background var(--transition), border-color var(--transition);
}

.conn-value:hover {
    background: rgba(5, 155, 218, 0.05);
    border-color: var(--blue);
}

.conn-value::after {
    content: 'click to copy';
    position: absolute;
    right: 0.5rem;
    top: 50%;
    transform: translateY(-50%);
    font-size: 0.65rem;
    font-family: 'Inter', sans-serif;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    opacity: 0;
    transition: opacity var(--transition);
}

.conn-value:hover::after { opacity: 1; }

.conn-value.copied {
    background: rgba(46, 204, 113, 0.08);
    border-color: #2ecc71;
}

.conn-value.copied::after {
    content: 'copied ✓';
    color: #2ecc71;
    opacity: 1;
}

.conn-value a {
    color: var(--blue);
    text-decoration: none;
    font-weight: 500;
}

.conn-value a:hover {
    text-decoration: underline;
}

/* ── Tabs Section ─────────────────────────────────────── */
.tabs-section {
    margin-top: 2rem;
}

.tabs-section h2 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--navy);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.tabs-section h2 .dot {
    width: 8px;
    height: 8px;
    background: var(--blue);
    border-radius: 50%;
    display: inline-block;
}

.tab-nav {
    display: flex;
    gap: 0;
    border-bottom: 2px solid var(--border);
    margin-bottom: 0;
}

.tab-btn {
    flex: 1;
    padding: 0.85rem 1rem;
    background: none;
    border: none;
    border-bottom: 3px solid transparent;
    margin-bottom: -2px;
    font-family: inherit;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-muted);
    cursor: pointer;
    transition: color var(--transition), border-color var(--transition), background var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.tab-btn:hover {
    color: var(--navy);
    background: rgba(5, 155, 218, 0.04);
}

.tab-btn.active {
    color: var(--blue);
    border-bottom-color: var(--blue);
}

.tab-icon {
    font-size: 1.1rem;
    line-height: 1;
}

.tab-panel {
    display: none;
    padding: 1.5rem 0.25rem;
    animation: fadeIn 0.25s ease-out;
}

.tab-panel.active { display: block; }

@keyframes fadeIn {
    from { opacity: 0; }
    to   { opacity: 1; }
}

.tab-panel h3 {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--navy);
    margin-bottom: 0.6rem;
    margin-top: 1.2rem;
}

.tab-panel h3:first-child { margin-top: 0; }

.tab-panel p,
.tab-panel li {
    font-size: 0.88rem;
    color: var(--text-muted);
    line-height: 1.65;
}

.tab-panel ul {
    margin: 0.5rem 0 0.75rem 1.25rem;
}

.tab-panel li {
    margin-bottom: 0.3rem;
}

.tab-panel code {
    font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
    font-size: 0.82rem;
    background: var(--bg);
    padding: 0.15rem 0.45rem;
    border-radius: 4px;
    border: 1px solid var(--border);
    color: var(--navy);
}

.tab-panel kbd {
    font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
    font-size: 0.78rem;
    background: var(--navy);
    color: #fff;
    padding: 0.15rem 0.5rem;
    border-radius: 4px;
}

.tab-panel table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 0.5rem;
    font-size: 0.85rem;
}

.tab-panel th {
    text-align: left;
    font-weight: 600;
    color: var(--navy);
    padding: 0.6rem 0.75rem;
    border-bottom: 2px solid var(--border);
}

.tab-panel td {
    padding: 0.5rem 0.75rem;
    border-bottom: 1px solid var(--border);
    color: var(--text-muted);
}

.tab-panel td code {
    font-weight: 500;
}

.dyn-user, .dyn-server {
    font-style: italic;
    transition: color var(--transition);
}

.dyn-user.filled, .dyn-server.filled {
    font-style: normal;
    font-weight: 600;
    color: var(--blue);
}

/* ── Footer ───────────────────────────────────────────── */
.footer {
    margin-top: 3rem;
    background: linear-gradient(135deg, var(--navy-dark) 0%, var(--navy) 100%);
    padding: 2rem 2rem 1.5rem;
    text-align: center;
}

.footer-label {
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: rgba(255, 255, 255, 0.4);
    margin-bottom: 1.25rem;
}

.footer-logos {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 2.5rem;
    flex-wrap: wrap;
}

.footer-logo {
    text-decoration: none;
    color: rgba(255, 255, 255, 0.7);
    transition: opacity var(--transition), transform var(--transition);
    display: flex;
    align-items: center;
    opacity: 0.7;
}

.footer-logo:hover {
    opacity: 1;
    transform: translateY(-2px);
}

.footer-logo img {
    height: 40px;
    width: auto;
}

.footer-divider {
    width: 1px;
    height: 32px;
    background: rgba(255, 255, 255, 0.15);
}

.footer-copy {
    margin-top: 1.5rem;
    padding-top: 1rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    font-size: 0.72rem;
    color: rgba(255, 255, 255, 0.3);
}

/* ── Responsive ───────────────────────────────────────── */
@media (max-width: 640px) {
    .hero { padding: 2rem 1.5rem 2.5rem; }
    .hero h1 { font-size: 1.35rem; }
    .container { padding: 0 1rem; }
    .card { padding: 1.25rem; }
    .tab-btn { font-size: 0.78rem; padding: 0.7rem 0.5rem; }
    .tab-btn .tab-label { display: none; }
    .tab-icon { font-size: 1.3rem; }
    .footer-logos { gap: 1.5rem; }
    .footer-logo img { height: 30px; }
}