/* ========================================
   TOKENS
   Define your design decisions here.
   Everything else in this file should
   reference these tokens with var().
   ======================================== */
:root {
    /* Colors: at least primary, background, text, accent */
    --color-primary: #0066cc;
    --color-background: #ffffff;
    --color-text: #333333;
    --color-accent: #ff6600;
    --color-muted: #999999;
    
    /* Spacing: at least sm, md, lg */
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 2rem;
    
    /* Typography: font family, base size */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-base: 1rem;
    
    /* Borders: radius */
    --border-radius: 0.5rem;
}
/* ========================================
   RESET
   A minimal reset so you start clean.
   ======================================== */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}
/* ========================================
   BASE STYLES
   Style the body, links, and any raw
   HTML elements here. Use nesting.
   ======================================== */
body {
    /* font family, color, background, line-height, padding */
    /* Use clamp() for padding to make it fluid. */
    font-family: var(--font-family);
    color: var(--color-text);
    background-color: var(--color-background);
    line-height: 1.6;
    padding: clamp(var(--spacing-md), 2vw, var(--spacing-lg));
    
    a {
        /* link color from tokens */
        color: var(--color-primary);
        text-decoration: none;
        
        &:hover {
            /* hover color from tokens */
            color: var(--color-accent);
            text-decoration: underline;
        }
    }
}
/* ========================================
   NAVIGATION
   Style .site-nav so students can get
   back to the homepage.
   ======================================== */
.site-nav {
    /* padding, margin-bottom */
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}
/* ========================================
   BOARD HEADER
   Style the page header area.
   ======================================== */
.board-header {
    /* text alignment, margin, padding */
    /* Use clamp() for the h1 font size. */
    text-align: center;
    margin: var(--spacing-lg) 0;
    padding: var(--spacing-lg) 0;
    
    h1 {
        /* fluid font size */
        font-size: clamp(1.5rem, 5vw, 2.5rem);
        margin-bottom: var(--spacing-md);
    }
    
    p {
        /* muted text color, spacing */
        color: var(--color-muted);
        margin: var(--spacing-md) 0;
    }
}
/* ========================================
   CARD GROUP
   Each section of cards (This Week,
   Coming Up, Announcements).
   ======================================== */
.card-group {
    /* margin-bottom using a token */
    margin-bottom: var(--spacing-lg);
    
    h2 {
        /* section heading styles */
        font-size: 1.5rem;
        margin-bottom: var(--spacing-md);
        color: var(--color-primary);
    }
}
/* ========================================
   CARDS GRID
   Layout the .cards container as a
   responsive grid or flex layout.
   ======================================== */
.cards {
    /* display, gap (use calc to derive from a token), columns */
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: calc(var(--spacing-md) * 1.5);
}
/* ========================================
   INDIVIDUAL CARD
   Style each .card article. This is where
   most of your nesting will happen.
   ======================================== */
.card {
    /* background, padding, border-radius, shadow */
    /* Use a var() with a fallback value here. */
    background-color: var(--card-bg, #f9f9f9);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    
    .card-tag {
        /* small label: font-size, padding, background, border-radius */
        font-size: 0.75rem;
        padding: var(--spacing-sm) calc(var(--spacing-sm) * 1.5);
        background-color: var(--color-accent);
        color: white;
        border-radius: var(--border-radius);
        display: inline-block;
        margin-bottom: var(--spacing-md);
    }
    
    h3 {
        /* card title styles */
        font-size: 1.25rem;
        margin: var(--spacing-md) 0;
        color: var(--color-primary);
    }
    
    p {
        /* card body text */
        margin: var(--spacing-md) 0;
        color: var(--color-text);
    }
    
    .card-meta {
        /* bottom row: flexbox with space-between */
        /* style the span and link inside here with nesting */
        display: flex;
        justify-content: space-between;
        align-items: center;
        margin-top: var(--spacing-lg);
        padding-top: var(--spacing-md);
        border-top: 1px solid #e0e0e0;
        
        span {
            font-size: 0.875rem;
            color: var(--color-muted);
        }
        
        a {
            font-weight: bold;
        }
    }
}
/* ========================================
   FOOTER
   Style the .board-footer at the bottom.
   ======================================== */
.board-footer {
    /* text alignment, padding, muted color, top border */
    text-align: center;
    padding: var(--spacing-lg);
    color: var(--color-muted);
    border-top: 1px solid #e0e0e0;
    margin-top: var(--spacing-lg);
}