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

:root {
    --color-primary: #2563eb;
    --color-primary-dark: #1d4ed8;
    --color-text: #1e293b;
    --color-text-light: #64748b;
    --color-bg: #ffffff;
    --color-bg-subtle: #f8fafc;
    --color-border: #e2e8f0;
    --color-danger: #dc2626;
    --color-danger-dark: #b91c1c;
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

body {
    font-family: var(--font-sans);
    color: var(--color-text);
    background: var(--color-bg);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* Header */
header {
    border-bottom: 1px solid var(--color-border);
    padding: 1rem 0;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-primary);
    text-decoration: none;
}

/* Hero */
.hero {
    padding: 6rem 1.5rem;
    text-align: center;
}

.hero h1 {
    font-size: 2.5rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 1rem;
}

.hero em {
    color: var(--color-primary);
    font-style: normal;
}

.tagline {
    font-size: 1.25rem;
    color: var(--color-text-light);
    max-width: 500px;
    margin: 0 auto;
}

/* Content pages */
.page {
    flex: 1;
    padding: 3rem 1.5rem;
}

.page h1 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.page .subtitle {
    color: var(--color-text-light);
    margin-bottom: 2rem;
}

.card {
    background: var(--color-bg-subtle);
    border: 1px solid var(--color-border);
    border-radius: 0.75rem;
    padding: 2rem;
    margin-bottom: 2rem;
}

.card h2 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
}

.card ul {
    padding-left: 1.25rem;
}

.card li {
    margin-bottom: 0.5rem;
}

.steps {
    counter-reset: step;
    list-style: none;
    padding-left: 0;
}

.steps li {
    counter-increment: step;
    padding-left: 2.5rem;
    position: relative;
    margin-bottom: 1rem;
}

.steps li::before {
    content: counter(step);
    position: absolute;
    left: 0;
    width: 1.75rem;
    height: 1.75rem;
    background: var(--color-primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.875rem;
    font-weight: 600;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 0.5rem;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.15s;
}

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

.btn-danger:hover {
    background: var(--color-danger-dark);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

#google-signin-btn {
    margin-bottom: 1.5rem;
}

/* Status messages */
.status {
    padding: 1rem;
    border-radius: 0.5rem;
    margin-top: 1rem;
    display: none;
}

.status.error {
    background: #fef2f2;
    color: var(--color-danger);
    border: 1px solid #fecaca;
    display: block;
}

.status.success {
    background: #f0fdf4;
    color: #15803d;
    border: 1px solid #bbf7d0;
    display: block;
}

.signed-in-as {
    padding: 1rem;
    background: var(--color-bg-subtle);
    border: 1px solid var(--color-border);
    border-radius: 0.5rem;
    margin-bottom: 1.5rem;
    display: none;
}

.signed-in-as.visible {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.signed-in-as img {
    width: 2rem;
    height: 2rem;
    border-radius: 50%;
}

/* Footer */
footer {
    margin-top: auto;
    border-top: 1px solid var(--color-border);
    padding: 2rem 0;
    text-align: center;
    color: var(--color-text-light);
    font-size: 0.875rem;
}

.footer-links {
    margin-bottom: 0.5rem;
}

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

.footer-links a:hover {
    color: var(--color-text);
}