/* CSS Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --color-black: #000000;
    --color-white: #FFFFFF;
    --color-yellow: #FFD700;
    /* Standard bright yellow */
    --color-grey-bg: #F9F9F9;
    --color-text-primary: #1A1A1A;
    --color-text-secondary: #555555;
    --color-border: #E0E0E0;
    --shadow-soft: 0 4px 20px rgba(0, 0, 0, 0.05);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--color-grey-bg);
    color: var(--color-text-primary);
    line-height: 1.6;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
.main-header {
    background-color: var(--color-black);
    color: var(--color-white);
    padding: 3rem 0;
    text-align: center;
}

.main-header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    letter-spacing: -0.02em;
}

.main-header .subtitle {
    font-size: 0.9rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    color: var(--color-yellow);
    text-transform: uppercase;
}

/* Main Content Area */
.main-content {
    flex: 1;
    padding: 2rem 1rem 4rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%;
    max-width: 900px;
    margin: 0 auto;
}

/* Tabs Navigation */
.tabs-container {
    margin-bottom: 2rem;
    background-color: var(--color-white);
    padding: 0.5rem;
    border-radius: 50px;
    box-shadow: var(--shadow-soft);
    width: 100%;
    max-width: 600px;
}

.tabs-nav {
    display: flex;
    justify-content: space-between;
    position: relative;
    width: 100%;
}

.tab-btn {
    flex: 1;
    border: none;
    background: transparent;
    padding: 1rem 1.5rem;
    font-family: inherit;
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text-secondary);
    cursor: pointer;
    border-radius: 40px;
    transition: all 0.2s ease;
    white-space: nowrap;
}

.tab-btn:hover {
    color: var(--color-black);
}

.tab-btn.active {
    background-color: var(--color-yellow);
    color: var(--color-black);
    box-shadow: 0 2px 10px rgba(255, 215, 0, 0.3);
}

.tab-btn:focus-visible {
    outline: 2px solid var(--color-yellow);
    outline-offset: 2px;
}

/* Content Card */
.content-card {
    background-color: var(--color-white);
    border-radius: 20px;
    padding: 3rem;
    width: 100%;
    box-shadow: var(--shadow-soft);
}

.tab-content {
    display: none;
    animation: fadeIn 0.3s ease-in-out;
}

.tab-content.active {
    display: block;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(5px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.tab-content h2 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
    color: var(--color-black);
    border-bottom: 3px solid var(--color-yellow);
    display: inline-block;
    padding-bottom: 0.2rem;
}

.last-updated {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    margin-bottom: 2rem;
    font-style: italic;
}

.content-body p {
    margin-bottom: 1.5rem;
    font-size: 1.05rem;
    color: #444;
}

.content-body h3 {
    margin-top: 2rem;
    margin-bottom: 1rem;
    font-size: 1.25rem;
}

.content-body h4 {
    margin-top: 1.5rem;
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
    color: var(--color-text-primary);
    font-weight: 600;
}

.content-body ul {
    margin-bottom: 1.5rem;
    padding-left: 1.5rem;
}

.content-body li {
    margin-bottom: 0.5rem;
}

/* Footer */
.main-footer {
    padding: 2rem 0;
    text-align: center;
    color: var(--color-text-secondary);
    font-size: 0.9rem;
    border-top: 1px solid var(--color-border);
    background-color: var(--color-white);
}

/* Responsive Design */
@media (max-width: 768px) {
    .main-header {
        padding: 2rem 0;
    }

    .main-header h1 {
        font-size: 1.8rem;
    }

    .tabs-container {
        border-radius: 12px;
        padding: 0.25rem;
    }

    .tabs-nav {
        flex-direction: column;
    }

    .tab-btn {
        width: 100%;
        border-radius: 8px;
        padding: 0.8rem;
        margin-bottom: 0.25rem;
    }

    .tab-btn:last-child {
        margin-bottom: 0;
    }

    .content-card {
        padding: 1.5rem;
        border-radius: 12px;
    }

    .tab-content h2 {
        font-size: 1.5rem;
    }
}