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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    line-height: 1.6;
    color: #333;
    background: #f5f5f5;
    min-height: 100vh;
    -webkit-text-size-adjust: 100%;
}

.hidden {
    display: none !important;
}

.loading {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    font-size: 1.2rem;
    color: #666;
}

header {
    background: #fff;
    padding: 1rem;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.75rem;
    position: sticky;
    top: 0;
    z-index: 100;
}

header h1 {
    font-size: 1.25rem;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

#username {
    color: #666;
    font-size: 0.9rem;
}

.container {
    max-width: 800px;
    margin: 1rem auto;
    padding: 0 1rem;
    padding-bottom: 2rem;
}

.card {
    background: #fff;
    border-radius: 8px;
    padding: 1.25rem;
    margin-top: 1rem;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.card h2 {
    font-size: 1.1rem;
    margin-bottom: 1rem;
}

button {
    background: #0066cc;
    color: #fff;
    border: none;
    padding: 0.75rem 1.25rem;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1rem;
    min-height: 44px;
    min-width: 44px;
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
}

button:hover {
    background: #0052a3;
}

button:active {
    background: #004080;
    transform: scale(0.98);
}

button:disabled {
    background: #ccc;
    cursor: not-allowed;
    transform: none;
}

#logout-btn {
    background: #666;
    padding: 0.5rem 1rem;
}

#logout-btn:hover {
    background: #444;
}

#logout-btn:active {
    background: #333;
}

pre {
    background: #f0f0f0;
    padding: 1rem;
    border-radius: 8px;
    margin-top: 1rem;
    overflow-x: auto;
    font-size: 0.85rem;
    white-space: pre-wrap;
    word-wrap: break-word;
    -webkit-overflow-scrolling: touch;
}

pre:empty {
    display: none;
}

/* Auth error display */
.auth-error {
    text-align: left;
    max-width: 500px;
    padding: 2rem;
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.15);
}

.auth-error h2 {
    color: #d32f2f;
    margin-bottom: 1rem;
}

.auth-error p {
    margin-bottom: 0.75rem;
}

.auth-error ul {
    margin: 0 0 1.5rem 1.5rem;
}

.auth-error li {
    margin-bottom: 0.5rem;
}

.auth-error button {
    width: 100%;
}

/* Mobile-first responsive adjustments */
@media (max-width: 480px) {
    header {
        padding: 0.75rem;
    }

    header h1 {
        font-size: 1.1rem;
    }

    .container {
        padding: 0 0.75rem;
    }

    .card {
        padding: 1rem;
        border-radius: 8px;
    }

    button {
        width: 100%;
        padding: 0.875rem 1rem;
    }

    #logout-btn {
        width: auto;
        padding: 0.5rem 0.875rem;
    }

    pre {
        font-size: 0.8rem;
        padding: 0.75rem;
    }
}

/* Larger screens */
@media (min-width: 768px) {
    header {
        padding: 1rem 2rem;
    }

    header h1 {
        font-size: 1.5rem;
    }

    .container {
        margin: 2rem auto;
    }

    .card {
        padding: 1.5rem;
    }

    button {
        width: auto;
    }
}

/* Safe area support for notched phones */
@supports (padding: max(0px)) {
    header {
        padding-left: max(1rem, env(safe-area-inset-left));
        padding-right: max(1rem, env(safe-area-inset-right));
    }

    .container {
        padding-left: max(1rem, env(safe-area-inset-left));
        padding-right: max(1rem, env(safe-area-inset-right));
        padding-bottom: max(2rem, env(safe-area-inset-bottom));
    }
}