/* CSS Variables */
:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --secondary: #8b5cf6;
    --accent: #ec4899;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --dark: #0f172a;
    --dark-light: #1e293b;
    --gray: #64748b;
    --gray-light: #94a3b8;
    --light: #f1f5f9;
    --white: #ffffff;
    --github-dark: #24292e;
    --github-green: #2ea44f;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    --radius: 12px;
    --radius-sm: 8px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: linear-gradient(135deg, var(--dark) 0%, #1a1a2e 100%);
    color: var(--light);
    min-height: 100dvh;
    line-height: 1.6;
}

/* App Container */
.app-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem;
    min-height: 100dvh;
    display: flex;
    flex-direction: column;
}

/* Header */
.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

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

.logo-icon {
    font-size: 2.5rem;
}

.logo h1 {
    font-size: 1.75rem;
    font-weight: 800;
}

.highlight {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.header-stats {
    background: rgba(30, 41, 59, 0.6);
    padding: 0.75rem 1.25rem;
    border-radius: var(--radius);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.stat-item {
    text-align: center;
}

.stat-item span {
    display: block;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
}

.stat-item small {
    font-size: 0.75rem;
    color: var(--gray-light);
}

/* Search Section */
.search-section {
    margin-bottom: 2rem;
}

.search-container {
    background: rgba(30, 41, 59, 0.6);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius);
    padding: 1.5rem;
}

.search-box {
    display: flex;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.search-icon {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    font-size: 1.25rem;
    color: var(--gray);
}

.search-wrapper {
    position: relative;
    flex: 1;
}

#search-input {
    width: 100%;
    padding: 1rem 1rem 1rem 3rem;
    background: rgba(15, 23, 42, 0.6);
    border: 2px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-sm);
    color: var(--white);
    font-size: 1rem;
    transition: var(--transition);
}

#search-input:focus {
    outline: none;
    border-color: var(--primary);
}

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

.search-suggestions {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.search-suggestions span {
    font-size: 0.875rem;
    color: var(--gray-light);
}

.suggestion-chip {
    padding: 0.375rem 1rem;
    background: rgba(99, 102, 241, 0.1);
    border: 1px solid rgba(99, 102, 241, 0.3);
    border-radius: 20px;
    color: var(--primary);
    font-size: 0.875rem;
    cursor: pointer;
    transition: var(--transition);
}

.suggestion-chip:hover {
    background: var(--primary);
    color: white;
    transform: translateY(-2px);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.875rem 1.5rem;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 0.9375rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: var(--white);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px -5px rgba(99, 102, 241, 0.4);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.1);
    color: var(--light);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.2);
}

.btn-full {
    width: 100%;
}

.btn-small {
    padding: 0.5rem 1rem;
    font-size: 0.8125rem;
}

/* Loading & Error States */
.loading, .error {
    text-align: center;
    padding: 4rem 2rem;
    background: rgba(30, 41, 59, 0.6);
    border-radius: var(--radius);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.spinner {
    width: 60px;
    height: 60px;
    border: 4px solid rgba(255, 255, 255, 0.1);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 1.5rem;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.error-icon {
    font-size: 4rem;
    display: block;
    margin-bottom: 1rem;
}

.error h3 {
    color: var(--danger);
    margin-bottom: 0.5rem;
}

.hidden {
    display: none !important;
}

/* Results Layout */
.results {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    animation: fadeIn 0.5s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Profile Header */
.profile-header {
    display: grid;
    grid-template-columns: auto 1fr auto;
    gap: 2rem;
    align-items: start;
    background: rgba(30, 41, 59, 0.6);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius);
    padding: 2rem;
}

.profile-avatar {
    position: relative;
}

.profile-avatar img {
    width: 150px;
    height: 150px;
    border-radius: 50%;
    border: 4px solid var(--primary);
    object-fit: cover;
}

.avatar-badge {
    position: absolute;
    bottom: 10px;
    right: 10px;
    background: var(--github-green);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    display: none;
}

.avatar-badge.visible {
    display: block;
}

.profile-info h2 {
    font-size: 2rem;
    margin-bottom: 0.25rem;
}

.username {
    color: var(--gray-light);
    font-size: 1.125rem;
    margin-bottom: 1rem;
}

.bio {
    color: var(--light);
    margin-bottom: 1.5rem;
    line-height: 1.7;
}

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

.profile-meta span {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--gray-light);
    font-size: 0.9375rem;
}

.profile-dates {
    display: flex;
    gap: 1.5rem;
    font-size: 0.875rem;
    color: var(--gray);
}

.profile-actions {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
}

.stat-card {
    background: rgba(30, 41, 59, 0.6);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius);
    padding: 1.5rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    transition: var(--transition);
}

.stat-card:hover {
    transform: translateY(-4px);
    border-color: rgba(255, 255, 255, 0.2);
}

.stat-icon {
    width: 50px;
    height: 50px;
    border-radius: var(--radius-sm);
    background: rgba(99, 102, 241, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
}

.stat-content h3 {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--white);
}

.stat-content p {
    color: var(--gray-light);
    font-size: 0.875rem;
}

/* Charts Section */
.charts-section {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

.chart-container {
    background: rgba(30, 41, 59, 0.6);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius);
    padding: 1.5rem;
}

.chart-container h3 {
    margin-bottom: 1.5rem;
    font-size: 1.125rem;
}

.chart-container canvas {
    max-height: 300px;
}

/* Content Grid */
.content-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 2rem;
}

/* Repositories Section */
.repositories-section {
    background: rgba(30, 41, 59, 0.6);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius);
    padding: 1.5rem;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.section-header h3 {
    font-size: 1.25rem;
}

.filters {
    display: flex;
    gap: 0.75rem;
}

.filters select,
.filters input {
    padding: 0.625rem 1rem;
    background: rgba(15, 23, 42, 0.6);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-sm);
    color: var(--white);
    font-size: 0.875rem;
}

.filters input {
    min-width: 200px;
}

.repos-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.repo-card {
    background: rgba(15, 23, 42, 0.4);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-sm);
    padding: 1.25rem;
    transition: var(--transition);
}

.repo-card:hover {
    border-color: rgba(255, 255, 255, 0.1);
    transform: translateX(4px);
}

.repo-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 0.75rem;
}

.repo-name {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--primary);
    text-decoration: none;
}

.repo-name:hover {
    text-decoration: underline;
}

.repo-visibility {
    font-size: 0.75rem;
    padding: 0.25rem 0.625rem;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    color: var(--gray-light);
}

.repo-description {
    color: var(--gray-light);
    font-size: 0.9375rem;
    margin-bottom: 1rem;
    line-height: 1.6;
}

.repo-meta {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    flex-wrap: wrap;
    font-size: 0.875rem;
    color: var(--gray);
}

.repo-meta span {
    display: flex;
    align-items: center;
    gap: 0.375rem;
}

.language-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

/* Sidebar */
.sidebar {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.sidebar-section {
    background: rgba(30, 41, 59, 0.6);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius);
    padding: 1.5rem;
}

.sidebar-section h3 {
    font-size: 1rem;
    margin-bottom: 1rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--gray-light);
}

/* Contribution Graph */
.contribution-graph {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 3px;
}

.contribution-cell {
    aspect-ratio: 1;
    border-radius: 2px;
    background: rgba(255, 255, 255, 0.05);
}

.contribution-cell.level-1 { background: #0e4429; }
.contribution-cell.level-2 { background: #006d32; }
.contribution-cell.level-3 { background: #26a641; }
.contribution-cell.level-4 { background: #39d353; }

/* Top Languages */
.top-languages {
    list-style: none;
}

.lang-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.lang-item:last-child {
    border-bottom: none;
}

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

.lang-color {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.lang-name {
    font-weight: 500;
}

.lang-percent {
    color: var(--gray-light);
    font-size: 0.875rem;
}

.lang-bar {
    height: 4px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 2px;
    margin-top: 0.5rem;
    overflow: hidden;
}

.lang-bar-fill {
    height: 100%;
    border-radius: 2px;
    transition: width 0.5s ease;
}

/* Activity List */
.activity-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.activity-item {
    display: flex;
    gap: 0.75rem;
    padding: 0.75rem;
    background: rgba(15, 23, 42, 0.4);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
}

.activity-icon {
    font-size: 1.25rem;
}

.activity-content {
    flex: 1;
}

.activity-content p {
    color: var(--light);
    margin-bottom: 0.25rem;
}

.activity-time {
    color: var(--gray);
    font-size: 0.75rem;
}

/* Saved Users */
.saved-users {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.saved-user {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem;
    background: rgba(15, 23, 42, 0.4);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
}

.saved-user:hover {
    background: rgba(15, 23, 42, 0.6);
}

.saved-user img {
    width: 40px;
    height: 40px;
    border-radius: 50%;
}

.saved-user-info {
    flex: 1;
}

.saved-user-name {
    font-weight: 600;
    font-size: 0.9375rem;
}

.saved-user-username {
    font-size: 0.75rem;
    color: var(--gray);
}

.remove-saved {
    background: none;
    border: none;
    color: var(--danger);
    cursor: pointer;
    font-size: 1.25rem;
    padding: 0.25rem;
}

.empty {
    color: var(--gray);
    font-size: 0.875rem;
    text-align: center;
    padding: 1rem;
}

/* Footer */
.app-footer {
    margin-top: auto;
    padding-top: 2rem;
    text-align: center;
    color: var(--gray);
    font-size: 0.875rem;
}

/* Responsive */
@media (max-width: 1024px) {
    .profile-header {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .profile-avatar {
        margin: 0 auto;
    }

    .profile-meta,
    .profile-dates {
        justify-content: center;
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .charts-section {
        grid-template-columns: 1fr;
    }

    .content-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 640px) {
    .app-container {
        padding: 1rem;
    }

    .search-box {
        flex-direction: column;
    }

    .stats-grid {
        grid-template-columns: 1fr;
    }

    .section-header {
        flex-direction: column;
        align-items: stretch;
    }

    .filters {
        flex-direction: column;
    }
}