/* ===== CSS Custom Properties ===== */
[data-theme="dark"] {
    --bg-primary: #0d1117;
    --bg-secondary: #161b22;
    --bg-card: #1c2128;
    --text-primary: #e6edf3;
    --text-secondary: #8b949e;
    --text-muted: #6e7681;
    --accent: #58a6ff;
    --accent-hover: #79c0ff;
    --border: #30363d;
    --tag-bg: #1f2937;
    --tag-text: #58a6ff;
    --shadow: rgba(0, 0, 0, 0.3);
}

[data-theme="light"] {
    --bg-primary: #ffffff;
    --bg-secondary: #f6f8fa;
    --bg-card: #ffffff;
    --text-primary: #1f2328;
    --text-secondary: #656d76;
    --text-muted: #8b949e;
    --accent: #0969da;
    --accent-hover: #0550ae;
    --border: #d0d7de;
    --tag-bg: #ddf4ff;
    --tag-text: #0969da;
    --shadow: rgba(0, 0, 0, 0.1);
}

/* ===== Reset & Base ===== */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: background-color 0.3s ease, color 0.3s ease;
}

a {
    color: var(--accent);
    text-decoration: none;
    transition: color 0.2s ease;
}

a:hover {
    color: var(--accent-hover);
}

/* ===== Layout ===== */
.layout {
    display: grid;
    grid-template-columns: 300px 1fr;
    min-height: 100vh;
}

/* ===== Sidebar ===== */
.sidebar {
    background-color: var(--bg-secondary);
    border-right: 1px solid var(--border);
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

.sidebar-content {
    position: sticky;
    top: 0;
    padding: 2.5rem 1.5rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    max-height: 100vh;
    overflow-y: auto;
}

/* ===== Profile Photo & Sunglasses ===== */
.profile-photo-wrapper {
    position: relative;
    width: 180px;
    height: 180px;
    margin-bottom: 1.5rem;
}

.profile-photo {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    object-fit: cover;
    border: 3px solid var(--border);
    transition: border-color 0.3s ease;
}

.sunglasses-overlay {
    position: absolute;
    top: 38%;
    left: 48%;
    width: 38%;
    opacity: 0;
    pointer-events: none;
    transform: translateX(-50%) translateY(-30px) rotate(-12deg);
    transition: opacity 0.5s ease 0.15s, transform 0.6s cubic-bezier(0.34, 1.56, 0.64, 1) 0.15s;
}

.sunglasses-overlay svg {
    width: 100%;
    height: auto;
    filter: drop-shadow(0 2px 6px rgba(0,0,0,0.4));
}

[data-theme="light"] .sunglasses-overlay {
    opacity: 1;
    transform: translateX(-50%) translateY(0) rotate(0deg);
}

/* ===== Name & Title ===== */
.name {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 0.25rem;
}

.title {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 1.5rem;
    transition: color 0.3s ease;
}

/* ===== Contact Links ===== */
.contact-links {
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
    margin-bottom: 2rem;
    width: 100%;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.85rem;
    color: var(--text-secondary);
    transition: color 0.2s ease;
}

a.contact-item:hover {
    color: var(--accent);
}

.contact-item svg {
    flex-shrink: 0;
}

/* ===== Theme Toggle ===== */
.theme-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border: 1px solid var(--border);
    border-radius: 50%;
    background: var(--bg-card);
    color: var(--text-secondary);
    cursor: pointer;
    transition: background-color 0.3s ease, border-color 0.3s ease, color 0.2s ease, transform 0.2s ease;
}

.theme-toggle:hover {
    color: var(--accent);
    transform: scale(1.1);
}

.theme-toggle:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

[data-theme="dark"] .icon-sun { display: none; }
[data-theme="dark"] .icon-moon { display: block; }
[data-theme="light"] .icon-sun { display: block; }
[data-theme="light"] .icon-moon { display: none; }

/* ===== Content ===== */
.content {
    padding: 3rem 3rem 4rem;
    max-width: 800px;
}

/* ===== Sections ===== */
.section {
    margin-bottom: 3rem;
}

.section-title {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--accent);
    margin-bottom: 1.25rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border);
    transition: color 0.3s ease, border-color 0.3s ease;
}

.section > p {
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
    transition: color 0.3s ease;
}

/* ===== Experience ===== */
.experience-item,
.education-item {
    margin-bottom: 2rem;
    padding-left: 1rem;
    border-left: 2px solid var(--border);
    transition: border-color 0.3s ease;
}

.experience-item:last-child,
.education-item:last-child {
    margin-bottom: 0;
}

.exp-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 0.25rem;
}

.exp-header h3 {
    font-size: 1.1rem;
    font-weight: 600;
}

.exp-date {
    font-size: 0.85rem;
    color: var(--text-muted);
    white-space: nowrap;
    transition: color 0.3s ease;
}

.exp-role {
    font-size: 0.95rem;
    color: var(--accent);
    margin-bottom: 0.15rem;
    transition: color 0.3s ease;
}

.exp-location {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
    transition: color 0.3s ease;
}

.exp-summary {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 0.75rem;
    transition: color 0.3s ease;
}

.exp-details h4 {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-top: 0.75rem;
    margin-bottom: 0.35rem;
    transition: color 0.3s ease;
}

.exp-details ul {
    list-style: none;
    padding: 0;
}

.exp-details ul li {
    position: relative;
    padding-left: 1rem;
    margin-bottom: 0.4rem;
    font-size: 0.88rem;
    color: var(--text-secondary);
    transition: color 0.3s ease;
}

.exp-details ul li::before {
    content: "\2022";
    position: absolute;
    left: 0;
    color: var(--accent);
}

/* ===== Tags ===== */
.tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.tag {
    display: inline-block;
    padding: 0.35rem 0.75rem;
    font-size: 0.82rem;
    font-weight: 500;
    background-color: var(--tag-bg);
    color: var(--tag-text);
    border-radius: 2rem;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* ===== Responsive: Tablet ===== */
@media (max-width: 768px) {
    .layout {
        grid-template-columns: 1fr;
    }

    .sidebar {
        border-right: none;
        border-bottom: 1px solid var(--border);
    }

    .sidebar-content {
        position: static;
        padding: 2rem 1.5rem;
    }

    .content {
        padding: 2rem 1.5rem 3rem;
    }
}

/* ===== Responsive: Mobile ===== */
@media (max-width: 480px) {
    .profile-photo-wrapper {
        width: 120px;
        height: 120px;
    }

    .name {
        font-size: 1.3rem;
    }

    .content {
        padding: 1.5rem 1rem 2rem;
    }

    .section-title {
        font-size: 1.15rem;
    }

    .exp-header {
        flex-direction: column;
        gap: 0.15rem;
    }
}