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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background-color: var(--primary-color);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

header {
    background-color: var(--surface-color);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 2rem;
}

nav {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--heading-primary);
}

.logo span {
    color: var(--primary-accent);
}

.nav-links {
    display: flex;
    gap: 2rem;
    list-style: none;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.2s;
}

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

.nav-username {
    color: var(--primary-accent);
    font-weight: 600;
    font-size: 0.95rem;
}

main {
    flex: 1;
    max-width: 1200px;
    margin: 0 auto;
    padding: 3rem 2rem;
    width: 100%;
}

.hero {
    text-align: center;
    margin-bottom: 4rem;
}

.hero h1 {
    font-size: 3.5rem;
    color: var(--heading-primary);
    margin-bottom: 1rem;
}

.hero h1 span {
    color: var(--primary-accent);
}

.hero p {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 2rem;
}

.cta-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    padding: 0.875rem 2rem;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.2s;
    cursor: pointer;
    border: none;
}

.btn-primary {
    background-color: var(--primary-accent);
    color: var(--primary-color);
    box-shadow: var(--accent-inset-shadow);
}

.btn-primary:hover {
    background-color: var(--primary-accent-hover);
    box-shadow: var(--accent-border-glow);
}

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

.btn-secondary:hover {
    background-color: var(--second-surface-color-hover);
    border-color: var(--border-color-hover);
}

.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-bottom: 4rem;
}

.feature-card {
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2rem;
    transition: all 0.2s;
}

.feature-card:hover {
    border-color: var(--border-color-hover);
    transform: translateY(-2px);
}

.feature-card h3 {
    color: var(--heading-secondary);
    margin-bottom: 0.75rem;
    font-size: 1.25rem;
}

.feature-card p {
    color: var(--text-secondary);
    line-height: 1.6;
}

.feature-icon {
    width: 48px;
    height: 48px;
    background-color: var(--second-surface-color);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

.how-it-works {
    text-align: center;
    margin-bottom: 4rem;
}

.how-it-works h2 {
    font-size: 2rem;
    color: var(--heading-primary);
    margin-bottom: 2rem;
}

.how-it-works h2 span {
    color: var(--primary-accent);
}

.steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
}

.step {
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2rem 1.5rem;
}

.step-number {
    width: 40px;
    height: 40px;
    background-color: var(--primary-accent);
    color: var(--primary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.1rem;
    margin: 0 auto 1rem;
}

.step h3 {
    color: var(--heading-secondary);
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
}

.step p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.5;
}

footer {
    background-color: var(--surface-color);
    border-top: 1px solid var(--border-color);
    padding: 2rem;
    text-align: center;
}

footer p {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

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

footer a:hover {
    text-decoration: underline;
}

a {
    text-decoration: none;
}

#master-link {
    background-color: var(--surface-color);
    box-shadow: none;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    transition: all 0.2s ease;
}

#master-link:hover {
    background-color: var(--surface-color-hover);
    border-color: var(--border-color-hover);
    color: var(--text-primary-hover);
}

.logout-form {
    display: inline;
    margin: 0;
}

.logout-button {
    background: none;
    color: var(--text-secondary);
    border: none;
    cursor: pointer;
    font: inherit;
    transition: all 200ms ease;
}

.logout-button:hover {
    color: var(--text-primary-hover);
}

.following-section {
    max-width: 900px;
    margin: 2rem auto 0;
    padding: 2rem;
    background: var(--surface-color);
    border-radius: 1rem;
    text-align: center;
}

.following-section h2 span {
    color: var(--primary-color);
}

.following-copy {
    margin-top: 0.5rem;
    color: var(--text-muted-color);
}

.follow-form {
    display: flex;
    justify-content: center;
    gap: 0.75rem;
    flex-wrap: wrap;
    margin-top: 1rem;
}

.follow-input {
    background-color: var(--second-surface-color);
    border: 1px solid var(--border-color);
    min-width: 260px;
    padding: 0.8rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    font: inherit;
}

.followed-users {
    margin-top: 1rem;
}

.followed-users label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.followed-users select {
    min-width: 260px;
    padding: 0.8rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    font: inherit;
    color: var(--text-primary);
    background-color: var(--second-surface-color);
}

.followed-users select option {
    color: var(--text-primary);
    background-color: var(--surface-color);
}

.followed-users select:focus {
    outline: none;
    border-color: var(--primary-accent);
    box-shadow: 0 0 0 3px color-mix(in srgb, var(--primary-accent) 25%, transparent);
    border-radius: 2.5px;
}

.no-followed-users {
    margin-top: 1rem;
    color: var(--text-muted-color);
}

.follow-success {
    margin-top: 0.75rem;
    color: var(--success-color, #22c55e);
    font-weight: 600;
}

.follow-error {
    margin-top: 0.75rem;
    color: var(--error-color, #ef4444);
    font-weight: 600;
}