/* 
   STEP 8: CSS VARIABLES (DESIGN TOKENS)
   By defining variables at the top, we can easily change the 
   entire look and feel of the site just by editing these values.
*/
:root {
    --bg-color: #fdfdfd;
    --text-primary: #1a1a1a;
    --text-secondary: #4a4a4a;
    --accent: #9a9a9a;
    --border: #eeeeee;
    --font-serif: 'Playfair Display', serif;
    --font-sans: 'Inter', sans-serif;
    --spacing-unit: 1.5rem;
}

/* 
   STEP 16: DARK MODE OVERRIDES
   When the 'dark-mode' class is added to the body, 
   we swap the values of our variables.
*/
body.dark-mode {
    --bg-color: #1a1a1a;
    --text-primary: #fdfdfd;
    --text-secondary: #aaaaaa;
    --border: #333333;
}

/* 
   STEP 9: RESET & BASE STYLES
   Removing browser defaults (margin/padding) ensures our 
   design looks consistent across all browsers.
*/
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: var(--font-sans);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased; /* Makes fonts look smoother on Mac */
    padding: 2rem 1rem;
}

/* 
   STEP 10: LAYOUT CONTAINER
   Limiting the width (800px) and centering it (margin: 0 auto)
   creates a professional "CV paper" feel on large screens.
*/
.cv-container {
    max-width: 800px;
    margin: 0 auto;
}

/* 
   STEP 11: HEADER STYLING (Flexbox)
   We use display: flex with justify-content: space-between 
   to push the name to the left and contact info to the right.
*/
.cv-header {
    border-bottom: 2px solid var(--text-primary);
    padding-bottom: 2rem;
    margin-bottom: 4rem;
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
}

.name {
    font-family: var(--font-serif);
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1;
    margin-bottom: 0.5rem;
}

.header-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.role {
    font-size: 1.1rem;
    color: var(--text-secondary);
    letter-spacing: 0.05em;
    text-transform: uppercase;
    margin: 0;
}

/* 
   STEP 15.1: FLOATING BUTTON STYLING
   We use position: fixed to keep the button in the same spot
   even when we scroll.
*/
.theme-btn {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background: var(--text-primary); /* Swaps with theme */
    border: 1px solid var(--border);
    color: var(--bg-color); /* Swaps with theme */
    padding: 0.6rem 1.2rem;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    border-radius: 2rem; /* Rounded pull feel */
    cursor: pointer;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 100;
}

.theme-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(0,0,0,0.15);
}

.theme-btn:active {
    transform: translateY(0);
}

.social-links a {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    border-bottom: 1px solid transparent;
    transition: border-bottom 0.2s;
}

.social-links a:hover {
    border-bottom: 1px solid var(--text-primary);
}

.contact-info {
    text-align: right;
    font-size: 0.95rem;
    color: var(--text-secondary);
}

/* 
   STEP 12: SECTION TYPOGRAPHY
   Hierachy is key. Small, uppercase, spaced-out letters 
   create a premium editorial look for section titles.
*/
.cv-section {
    margin-bottom: 4rem;
}

.section-title {
    font-family: var(--font-serif);
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.2em;
    color: var(--accent);
    margin-bottom: 2rem;
    border-bottom: 1px solid var(--border);
    padding-bottom: 0.5rem;
}

.experience-item, .project-item {
    margin-bottom: 2.5rem;
}

.item-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: 0.25rem;
}

.item-title {
    font-size: 1.25rem;
    font-weight: 600;
}

/* Link Animation: A simple way to add "premium" feel */
.item-title a {
    color: var(--text-primary);
    text-decoration: none;
    background: linear-gradient(to right, var(--text-primary), var(--text-primary)) no-repeat bottom left;
    background-size: 0 1px;
    transition: background-size 0.3s;
}

.item-title a:hover {
    background-size: 100% 1px;
}

.item-date {
    font-size: 0.9rem;
    color: var(--accent);
    font-variant-numeric: tabular-nums;
}

.item-org {
    color: var(--text-secondary);
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.item-desc {
    color: var(--text-secondary);
    max-width: 600px;
}

/* 
   STEP 13: GRID SYSTEM
   We use display: grid to create a 2-column layout for 
   Skills and Education side-by-side.
*/
.inline-sections {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
}

.skills-list {
    list-style: none;
}

.skills-list li {
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
}

.skills-list li::before {
    content: "— "; /* Adding custom bullet points with CSS */
    color: var(--accent);
}

/* Footer styling */
.cv-footer {
    border-top: 1px solid var(--border);
    padding-top: 2rem;
    margin-top: 6rem;
    color: var(--accent);
    font-size: 0.85rem;
    text-align: center;
}

/* 
   STEP 14: RESPONSIVENESS (Media Queries)
   We rethink the layout for smaller screens (phones). 
   We stack the header and grid columns vertically.
*/
@media (max-width: 600px) {
    .cv-header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .contact-info {
        text-align: left;
        margin-top: 1.5rem;
    }

    .name {
        font-size: 2.5rem;
    }

    .inline-sections {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .item-header {
        flex-direction: column;
    }

    .item-date {
        margin-top: 0.25rem;
        margin-bottom: 0.5rem;
    }
}