/* ---
   Root Variables & Global Styles
   --- */
:root {
    --font-family-base: 'Source Sans Pro', sans-serif;
    --font-family-heading: 'Roboto', sans-serif;

    --light-bg: #f8f9fa;
    --light-panel-bg: #ffffff;
    --light-text: #212529;
    --light-text-secondary: #6c757d;
    --light-border: #dee2e6;
    --light-link: #007bff;
    --light-link-hover: #0056b3;
    --light-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);

    --dark-bg: #161b22;
    --dark-panel-bg: #0d1117;
    --dark-text: #c9d1d9;
    --dark-text-secondary: #8b949e;
    --dark-border: #30363d;
    --dark-link: #58a6ff;
    --dark-link-hover: #80b6ff;
    --dark-shadow: 0 4px 6px rgba(0, 0, 0, 0.2);
}

[data-theme="light"] {
    --bg-color: var(--light-bg);
    --panel-bg-color: var(--light-panel-bg);
    --text-color: var(--light-text);
    --text-secondary-color: var(--light-text-secondary);
    --border-color: var(--light-border);
    --link-color: var(--light-link);
    --link-hover-color: var(--light-link-hover);
    --shadow: var(--light-shadow);
}

[data-theme="dark"] {
    --bg-color: var(--dark-bg);
    --panel-bg-color: var(--dark-panel-bg);
    --text-color: var(--dark-text);
    --text-secondary-color: var(--dark-text-secondary);
    --border-color: var(--dark-border);
    --link-color: var(--dark-link);
    --link-hover-color: var(--dark-link-hover);
    --shadow: var(--dark-shadow);
}

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

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: var(--font-family-base);
    line-height: 1.7;
    transition: background-color 0.3s, color 0.3s;
}

.page-container {
    display: flex;
    max-width: 1400px;
    margin: 0 auto;
}

/* ---
   Sidebar
   --- */
#sidebar {
    width: 280px;
    background-color: var(--panel-bg-color);
    border-right: 1px solid var(--border-color);
    height: 100vh;
    position: fixed;
    top: 0;
    left: 0;
    padding: 30px;
    display: flex;
    flex-direction: column;
    transition: background-color 0.3s, border-color 0.3s, transform 0.3s ease-in-out;
    z-index: 100;
}

.profile-img {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    margin: 0 auto 15px;
    display: block;
    border: 3px solid var(--border-color);
}

.profile-name {
    font-family: var(--font-family-heading);
    font-size: 1.5rem;
    text-align: center;
    color: var(--text-color);
}

.profile-bio {
    font-size: 0.9rem;
    text-align: center;
    color: var(--text-secondary-color);
    margin-bottom: 30px;
}

.nav-menu {
    display: flex;
    flex-direction: column;
    gap: 5px;
    margin-bottom: 30px;
}

.nav-item {
    color: var(--text-secondary-color);
    text-decoration: none;
    padding: 10px 15px;
    border-radius: 6px;
    font-weight: 600;
    transition: background-color 0.2s, color 0.2s;
}

.nav-item i {
    margin-right: 15px;
    width: 20px;
    text-align: center;
}

.nav-item:hover, .nav-item.active {
    background-color: rgba(108, 117, 125, 0.1);
    color: var(--text-color);
}

.social-links {
    text-align: center;
    margin-top: auto;
    padding-top: 20px;
}

.social-links a {
    color: var(--text-secondary-color);
    font-size: 1.2rem;
    margin: 0 10px;
    transition: color 0.2s;
}

.social-links a:hover {
    color: var(--link-color);
}

.theme-toggle {
    text-align: center;
    margin-top: 20px;
}

#theme-toggle-btn {
    background: none;
    border: 1px solid var(--border-color);
    color: var(--text-secondary-color);
    width: 50px;
    height: 28px;
    border-radius: 14px;
    cursor: pointer;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: space-around;
    padding: 0 5px;
}

#theme-toggle-btn i {
    font-size: 0.8rem;
    z-index: 1;
}

#theme-toggle-btn::after {
    content: '';
    position: absolute;
    top: 2px;
    left: 3px;
    width: 22px;
    height: 22px;
    background-color: var(--text-secondary-color);
    border-radius: 50%;
    transition: transform 0.3s ease;
}

[data-theme="dark"] #theme-toggle-btn::after {
    transform: translateX(21px);
}

/* ---
   Main Content
   --- */
.main-content-wrapper {
    flex: 1;
    margin-left: 280px;
    position: relative;
}

#main-content {
    max-width: 800px;
    margin: 0 auto;
    padding: 60px 40px;
}

.content-section {
    padding-bottom: 60px;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 60px;
}

.content-section:last-of-type {
    border-bottom: none;
    margin-bottom: 0;
}

.section-title {
    font-family: var(--font-family-heading);
    font-size: 2rem;
    margin-bottom: 30px;
    color: var(--text-color);
}

p {
    margin-bottom: 1.25rem;
    color: var(--text-secondary-color);
}

p.lead {
    font-size: 1.2rem;
    color: var(--text-color);
}

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

a:hover {
    text-decoration: underline;
    color: var(--link-hover-color);
}

/* Skills */
.skills h3 {
    margin-bottom: 15px;
    font-size: 1.2rem;
}
.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}
.skill-tags span {
    background-color: rgba(108, 117, 125, 0.1);
    color: var(--text-secondary-color);
    padding: 5px 12px;
    border-radius: 15px;
    font-size: 0.9rem;
}

/* Projects */
.project-list {
    display: flex;
    flex-direction: column;
    gap: 30px;
}
.project-item {
    display: flex;
    gap: 20px;
    align-items: flex-start;
}
.project-content {
    flex-grow: 1;
}
.project-title {
    font-size: 1.3rem;
    margin-bottom: 5px;
    color: var(--text-color);
}
.project-tags {
    display: flex;
    gap: 10px;
    margin-top: 15px;
}
.project-tags span {
    font-size: 0.8rem;
    background-color: var(--link-color);
    color: white;
    padding: 3px 8px;
    border-radius: 4px;
}
.project-links {
    display: flex;
    gap: 15px;
}

/* Blog Posts */
.post-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
}
.post-item {
    display: block;
    padding: 20px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    transition: border-color 0.2s, transform 0.2s;
}
.post-item:hover {
    border-color: var(--link-color);
    transform: translateY(-3px);
    text-decoration: none;
}
.post-item h4 {
    font-size: 1.2rem;
    color: var(--text-color);
    margin-bottom: 5px;
}
.post-item time {
    font-size: 0.85rem;
    color: var(--text-secondary-color);
    margin-top: 10px;
    display: block;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 10px 20px;
    background-color: var(--link-color);
    color: #fff;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 600;
    transition: background-color 0.2s, transform 0.2s;
}
.btn:hover {
    background-color: var(--link-hover-color);
    text-decoration: none;
    transform: translateY(-2px);
}
.btn-icon {
    font-size: 1.4rem;
    color: var(--text-secondary-color);
}
.btn-icon:hover {
    color: var(--link-color);
}

/* Footer */
.main-footer {
    padding-top: 40px;
    text-align: center;
    font-size: 0.9rem;
    color: var(--text-secondary-color);
}

/* ---
   Mobile Responsiveness
   --- */
#sidebar-toggle {
    display: none;
    position: fixed;
    top: 20px;
    left: 20px;
    z-index: 101;
    background: var(--panel-bg-color);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    color: var(--text-color);
    font-size: 1rem;
    cursor: pointer;
}

@media (max-width: 992px) {
    #sidebar {
        transform: translateX(-100%);
        border-right: none;
    }
    #sidebar.active {
        transform: translateX(0);
        box-shadow: 0 0 50px rgba(0,0,0,0.5);
    }
    .main-content-wrapper {
        margin-left: 0;
    }
    #main-content {
        padding: 80px 20px 40px;
    }
    #sidebar-toggle {
        display: block;
    }
}