/* LinkUp - Stili globali + Landing page */

:root {
    --bg-primary: #0f0f0f;
    --bg-secondary: #1a1a2e;
    --bg-tertiary: #16213e;
    --bg-input: #0a0a1a;
    --text-primary: #e2e8f0;
    --text-secondary: #94a3b8;
    --accent: #6366f1;
    --accent-hover: #818cf8;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --border: #2d2d44;
    --shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
    --radius: 12px;
    --radius-sm: 8px;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.5;
}

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

/* --- Landing page --- */

.landing-container {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: 20px;
}

.landing-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 48px 40px;
    width: 100%;
    max-width: 440px;
    box-shadow: var(--shadow);
}

.landing-logo {
    text-align: center;
    margin-bottom: 32px;
}

.landing-logo svg {
    width: 56px;
    height: 56px;
    margin-bottom: 12px;
}

.landing-logo h1 {
    font-size: 28px;
    font-weight: 700;
    letter-spacing: -0.5px;
}

.landing-logo p {
    color: var(--text-secondary);
    font-size: 14px;
    margin-top: 4px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 6px;
}

.form-input {
    width: 100%;
    padding: 12px 16px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 15px;
    outline: none;
    transition: border-color 0.2s;
}

.form-input:focus {
    border-color: var(--accent);
}

.form-input::placeholder {
    color: var(--text-secondary);
    opacity: 0.6;
}

.form-input.code-input {
    text-transform: uppercase;
    letter-spacing: 4px;
    font-weight: 600;
    font-size: 18px;
    text-align: center;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 24px;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s, transform 0.1s;
    width: 100%;
}

.btn:active {
    transform: scale(0.98);
}

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

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

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    background: #1e2a4a;
}

.divider {
    display: flex;
    align-items: center;
    margin: 24px 0;
    color: var(--text-secondary);
    font-size: 13px;
}

.divider::before,
.divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--border);
}

.divider span {
    padding: 0 16px;
}

.join-row {
    display: flex;
    gap: 10px;
}

.join-row .form-input {
    flex: 1;
}

.join-row .btn {
    width: auto;
    padding: 12px 20px;
    white-space: nowrap;
}

.error-msg {
    color: var(--danger);
    font-size: 13px;
    margin-top: 8px;
    display: none;
}

.error-msg.show {
    display: block;
}

.btn-large {
    padding: 16px 24px;
    font-size: 17px;
}

.hint-text {
    text-align: center;
    color: var(--text-secondary);
    font-size: 13px;
}

.status-box {
    text-align: center;
    padding: 20px 0;
}

.status-box p {
    font-size: 15px;
    margin-top: 16px;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    margin: 0 auto;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* --- Toast notifications --- */

.toast {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: 12px 20px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 500;
    z-index: 1000;
    animation: toast-in 0.3s ease, toast-out 0.3s ease 3.5s forwards;
    max-width: 360px;
}

.toast-info {
    background: var(--bg-tertiary);
    border: 1px solid var(--accent);
    color: var(--text-primary);
}

.toast-error {
    background: #2d1215;
    border: 1px solid var(--danger);
    color: #fca5a5;
}

.toast-success {
    background: #0d2818;
    border: 1px solid var(--success);
    color: #6ee7b7;
}

@keyframes toast-in {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes toast-out {
    from { opacity: 1; }
    to { opacity: 0; }
}