.auth-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--an-bg);
    padding: 1rem;
}

.auth-card {
    background: var(--an-surface);
    border-radius: 0.75rem;
    padding: 2rem;
    width: 100%;
    max-width: 420px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.4);
    color: var(--an-text);
}

.auth-logo { text-align: center; margin-bottom: 2rem; }
.auth-logo h1 { font-size: 1.75rem; margin: 0 0 0.25rem; color: var(--an-text); }
.auth-logo p  { color: var(--an-text-muted); margin: 0; font-size: 0.9rem; }

.auth-form { }
.form-group { margin-bottom: 1rem; }
.form-group label { display: block; font-size: 0.85rem; color: var(--an-text-muted); margin-bottom: 0.35rem; }
.form-input {
    width: 100%; padding: 0.6rem 0.75rem;
    background: var(--an-bg); border: 1px solid var(--an-border);
    border-radius: 0.375rem; color: var(--an-text);
    font-size: 0.95rem; box-sizing: border-box;
    transition: border-color 0.2s;
    min-width: 0;
}
.form-input:focus { outline: none; border-color: var(--an-accent); }
.form-input::placeholder { color: var(--an-text-muted); }

.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 0.75rem; }

.form-check { display: flex; align-items: center; gap: 0.5rem; margin-bottom: 1.25rem; }
.form-check label { font-size: 0.85rem; color: var(--an-text-muted); margin: 0; cursor: pointer; }

.btn-primary {
    width: 100%; padding: 0.7rem;
    background: var(--an-accent); color: var(--an-accent-text);
    border: none; border-radius: 0.375rem;
    font-size: 0.95rem; cursor: pointer;
    transition: background 0.2s;
    display: flex; align-items: center; justify-content: center; gap: 0.5rem;
}
.btn-primary:hover:not(:disabled) { background: var(--an-accent-h); }
.btn-primary:disabled { opacity: 0.6; cursor: not-allowed; }

.btn-link {
    background: none; border: none; color: var(--an-accent);
    font-size: 0.85rem; cursor: pointer; padding: 0.5rem;
    text-decoration: none; transition: color 0.2s;
}
.btn-link:hover:not(:disabled) { color: var(--an-accent-h); text-decoration: underline; }
.btn-link:disabled { opacity: 0.5; cursor: not-allowed; }

.auth-error {
    background: #450a0a; border: 1px solid #ef4444;
    color: #fca5a5; padding: 0.6rem 0.75rem;
    border-radius: 0.375rem; font-size: 0.85rem;
    margin-bottom: 1rem;
}
.auth-warning {
    background: #422006; border: 1px solid #f59e0b;
    color: #fcd34d; padding: 0.6rem 0.75rem;
    border-radius: 0.375rem; font-size: 0.85rem;
    margin-bottom: 1rem;
    display: flex; align-items: baseline; gap: 0.4rem; flex-wrap: wrap;
}
.auth-warning .btn-link { color: #fcd34d; font-size: 0.8rem; padding: 0; margin: 0; }
.auth-warning .btn-link:hover { color: #fef3c7; }

.auth-success {
    background: #052e16; border: 1px solid #22c55e;
    color: #86efac; padding: 0.6rem 0.75rem;
    border-radius: 0.375rem; font-size: 0.85rem;
}
.auth-success a { color: #4ade80; }

.auth-footer { text-align: center; margin-top: 1.5rem; font-size: 0.85rem; color: var(--an-text-muted); }
.auth-footer a { color: var(--an-accent); text-decoration: none; }
.auth-footer a:hover { text-decoration: underline; }

.spinner-sm {
    width: 1rem; height: 1rem;
    border: 2px solid rgba(255,255,255,0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.7s linear infinite;
    display: inline-block;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* Password strength indicator */
.password-rules {
    margin-top: 0.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.password-rule {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.78rem;
}

.rule-ok   { color: #22c55e; }
.rule-fail { color: #ef4444; }

/* Referral code input */
.ref-code-input-wrapper {
    display: flex;
    align-items: center;
    gap: 0;
    background: var(--an-bg);
    border: 1px solid var(--an-border);
    border-radius: 0.375rem;
    overflow: hidden;
}

.ref-code-prefix {
    padding: 0.6rem 0.75rem;
    font-size: 0.75rem;
    color: var(--an-text-muted);
    background: var(--an-surface);
    border-right: 1px solid var(--an-border);
    white-space: nowrap;
    font-family: monospace;
}

.ref-code-input {
    border: none !important;
    border-radius: 0 !important;
    background: transparent !important;
    flex: 1;
    font-family: monospace;
}
.ref-code-input:focus { outline: none; }

/* Code availability status */
.ref-code-status {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    font-size: 0.8rem;
    margin-top: 0.35rem;
    padding: 0.2rem 0;
}
.ref-code-status.available { color: #4ade80; }
.ref-code-status.taken     { color: #f87171; }
.ref-code-status.checking  { color: #94a3b8; }
.ref-code-status.hint      { color: #64748b; }

.spin { display: inline-block; animation: spin 0.7s linear infinite; }

/* Success: generated link display */
.ref-link-display {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    background: var(--an-bg);
    border: 1px solid var(--an-border);
    border-radius: 0.375rem;
    padding: 0.75rem 1rem;
    margin-top: 0.5rem;
}
.ref-link-display code {
    font-size: 0.85rem;
    color: var(--an-accent);
    word-break: break-all;
}

.an-icon-btn {
    background: transparent;
    border: 1px solid var(--an-border);
    border-radius: 0.25rem;
    color: var(--an-text-muted);
    padding: 0.3rem 0.5rem;
    cursor: pointer;
    transition: color 0.2s, border-color 0.2s;
}
.an-icon-btn:hover {
    color: var(--an-text);
    border-color: var(--an-accent);
}

/* Join success screen */
.join-success {
    text-align: center;
    padding: 2rem 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
}

.join-success i {
    font-size: 3rem;
    color: var(--an-text-muted);
}

.join-success h2 {
    margin: 0;
    font-size: 1.25rem;
    color: var(--an-text);
}

.join-success p {
    margin: 0;
    font-size: 0.875rem;
    color: var(--an-text-muted);
}