:root {
    /* Light Theme Variables */
    --bg-main: #f6f8fa;
    --bg-card: #ffffff;
    --text-primary: #1f2328;
    --text-secondary: #656d76;
    --accent-color: #0969da;
    --accent-hover: #0550ae;
    --border-color: #d0d7de;
    --shadow-sm: 0 1px 3px rgba(31, 35, 40, 0.12);
    --shadow-md: 0 4px 12px rgba(31, 35, 40, 0.08);
    --error-color: #cf222e;
    --skeleton-bg: #eaeef2;
    --skeleton-shimmer: #d0d7de;
}

[data-theme="dark"] {
    /* Dark Theme Variables */
    --bg-main: #0d1117;
    --bg-card: #161b22;
    --text-primary: #e6edf3;
    --text-secondary: #7d8590;
    --accent-color: #2f81f7;
    --accent-hover: #58a6ff;
    --border-color: #30363d;
    --shadow-sm: 0 1px 3px rgba(1, 4, 9, 0.8);
    --shadow-md: 0 4px 12px rgba(1, 4, 9, 0.5);
    --error-color: #f85149;
    --skeleton-bg: #21262d;
    --skeleton-shimmer: #30363d;
}

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

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background-color: var(--bg-main);
    color: var(--text-primary);
    line-height: 1.5;
    transition: background-color 0.3s ease, color 0.3s ease;
    min-height: 100vh;
}

.app-container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 2rem 1rem;
}

/* Header */
.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 700;
}

.theme-toggle {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 1px;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem;
    border-radius: 6px;
    transition: color 0.2s, background-color 0.2s;
}

.theme-toggle:hover {
    color: var(--text-primary);
    background-color: var(--border-color);
}

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

.icon-sun, .icon-moon {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* Main Content */
.main-content {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

/* Search Form */
.search-form {
    display: flex;
    gap: 1rem;
    background-color: var(--bg-card);
    padding: 0.5rem 0.5rem 0.5rem 1rem;
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    position: relative;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.search-form:focus-within {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(9, 105, 218, 0.3);
}

.search-form.error {
    border-color: var(--error-color);
}

.search-input-wrapper {
    flex-grow: 1;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.search-icon {
    color: var(--accent-color);
}

#search-input {
    flex-grow: 1;
    border: none;
    background: transparent;
    color: var(--text-primary);
    font-family: inherit;
    font-size: 1rem;
    outline: none;
    width: 100%;
}

#search-input::placeholder {
    color: var(--text-secondary);
}

.btn-search {
    background-color: var(--accent-color);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: background-color 0.2s;
}

.btn-search:hover {
    background-color: var(--accent-hover);
}

.error-msg {
    color: var(--error-color);
    font-size: 0.9rem;
    font-weight: 600;
    position: absolute;
    right: 120px;
    display: none;
}

/* Profile Card */
.profile-card {
    background-color: var(--bg-card);
    border-radius: 16px;
    padding: 2.5rem;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    display: flex;
    gap: 2rem;
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

.profile-avatar {
    width: 150px;
    height: 150px;
    border-radius: 50%;
    border: 1px solid var(--border-color);
    flex-shrink: 0;
}

.profile-info {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.profile-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 0.5rem;
}

.profile-header h2 {
    font-size: 1.75rem;
    display: flex;
    flex-direction: column;
}

.github-link {
    font-size: 1rem;
    color: var(--accent-color);
    text-decoration: none;
    font-weight: 400;
}

.github-link:hover {
    text-decoration: underline;
}

.join-date {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.profile-bio {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.profile-bio.no-bio {
    opacity: 0.7;
    font-style: italic;
}

.profile-stats {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 2rem;
}

.stat-item {
    background-color: var(--bg-main);
    padding: 0.75rem 1rem;
    border-radius: 8px;
    flex: 1;
    min-width: 100px;
    display: flex;
    flex-direction: column;
    align-items: center;
    border: 1px solid var(--border-color);
}

.stat-label {
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
}

.stat-value {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-primary);
}

.profile-links {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
}

.link-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

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

.link-item a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.2s;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

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

/* Repositories Section */
.repos-section {
    margin-top: 2rem;
}

.repos-section h2 {
    font-size: 1.25rem;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border-color);
}

.repos-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1rem;
}

.repo-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.25rem;
    display: flex;
    flex-direction: column;
    transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
    text-decoration: none;
    color: inherit;
}

.repo-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--accent-color);
}

.repo-name {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--accent-color);
    margin-bottom: 0.75rem;
    word-break: break-all;
}

.repo-name svg {
    color: var(--text-secondary);
}

.repo-desc {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 1rem;
    flex-grow: 1;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.repo-stats {
    display: flex;
    align-items: center;
    gap: 1rem;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.repo-stat-item {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.repo-lang-color {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    display: inline-block;
}

/* View all repos */
.view-more-container {
    margin-top: 2rem;
    text-align: center;
}

.view-all-btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    background-color: transparent;
    color: var(--accent-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-weight: 600;
    text-decoration: none;
    transition: background-color 0.2s;
}

.view-all-btn:hover {
    background-color: var(--skeleton-bg);
}

/* Empty State / Error */
.empty-state {
    text-align: center;
    padding: 3rem 1rem;
    color: var(--text-secondary);
    background-color: var(--bg-card);
    border-radius: 16px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
}

.error-state {
    text-align: center;
    padding: 3rem 1rem;
    background-color: var(--bg-card);
    border-radius: 16px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
}

.error-state h2 {
    color: var(--error-color);
    margin-bottom: 0.5rem;
}

.error-state p {
    color: var(--text-secondary);
}

/* Skeleton Loading */
.loading-skeleton {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.skeleton-profile {
    background-color: var(--bg-card);
    border-radius: 16px;
    padding: 2rem;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    display: flex;
    gap: 2rem;
}

.skeleton-avatar {
    width: 150px;
    height: 150px;
    border-radius: 50%;
    background: var(--skeleton-bg);
    animation: shimmer 1.5s infinite linear;
}

.skeleton-content {
    flex: 1;
}

.skeleton-line {
    height: 20px;
    background: var(--skeleton-bg);
    border-radius: 4px;
    margin-bottom: 1rem;
    animation: shimmer 1.5s infinite linear;
}

.skeleton-line.short { width: 40%; }
.skeleton-line.medium { width: 70%; }
.skeleton-line.long { width: 100%; }

.skeleton-stats {
    display: flex;
    gap: 1rem;
    margin-top: 1.5rem;
}

.skeleton-stat {
    height: 50px;
    flex: 1;
    background: var(--skeleton-bg);
    border-radius: 8px;
    animation: shimmer 1.5s infinite linear;
}

.skeleton-repos {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1rem;
}

.skeleton-repo {
    height: 150px;
    background-color: var(--bg-card);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    padding: 1.25rem;
    animation: shimmer 1.5s infinite linear;
}

@keyframes shimmer {
    0% { background-color: var(--skeleton-bg); }
    50% { background-color: var(--skeleton-shimmer); }
    100% { background-color: var(--skeleton-bg); }
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .profile-card {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

    .profile-info {
        align-items: center;
    }

    .profile-header h2 {
        justify-content: center;
    }

    .stat-item {
        min-width: calc(33.33% - 1rem);
    }

    .skeleton-profile {
        flex-direction: column;
        align-items: center;
    }
}

@media (max-width: 480px) {
    .app-header {
        flex-direction: column;
        gap: 1rem;
    }
    
    .search-form {
        flex-direction: column;
    }
    
    .btn-search {
        width: 100%;
    }
    
    .stat-item {
        min-width: calc(50% - 1rem);
    }
    
    .skeleton-stats {
        flex-wrap: wrap;
    }
    .skeleton-stat {
        min-width: calc(50% - 1rem);
    }
}