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

:root {
    /* Light theme variables */
    --bg-color: #fafafa;
    --text-color: #333;
    --card-bg: #ffffff;
    --border-color: #eee;
    --primary-color: #000000;
    --primary-hover: #333333;
    --button-hover-bg: #f5f5f5;
    --shadow: rgba(0,0,0,0.1);
    --shadow-hover: rgba(0,0,0,0.15);
}

[data-theme="dark"] {
    /* Dark theme variables */
    --bg-color: #1a1a1a;
    --text-color: #e0e0e0;
    --card-bg: #2d2d2d;
    --border-color: #404040;
    --primary-color: #ffffff;
    --primary-hover: #cccccc;
    --button-hover-bg: #404040;
    --shadow: rgba(0,0,0,0.3);
    --shadow-hover: rgba(0,0,0,0.4);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.app-container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Top Navigation Bar */
.top-bar {
    background-color: var(--primary-color);
    color: var(--bg-color);
    padding: 1rem;
    display: flex;
    align-items: center;
    box-shadow: 0 2px 4px var(--shadow);
    position: relative;
    z-index: 1000;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.title {
    flex-grow: 1;
    font-size: 1.25rem;
    font-weight: 500;
}

.theme-toggle {
    background: none;
    border: none;
    color: var(--bg-color);
    font-size: 1.25rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 4px;
    margin-right: 1rem;
    transition: background-color 0.2s ease, color 0.3s ease;
}

.theme-toggle:hover {
    background-color: rgba(128,128,128,0.2);
}

.commit-hash {
    font-size: 0.875rem;
    opacity: 0.8;
}

/* Main Content */
.main-content {
    flex: 1;
    padding: 2rem;
}

/* Grid Container */
.grid-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    max-width: 1200px;
    margin: 0 auto;
}

/* Cards */
.card {
    background: var(--card-bg);
    border-radius: 8px;
    box-shadow: 0 2px 8px var(--shadow);
    overflow: hidden;
    transition: transform 0.2s ease, box-shadow 0.2s ease, background-color 0.3s ease;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 16px var(--shadow-hover);
}

.card-header {
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 1rem;
}

.card-header h3 {
    margin: 0;
    font-size: 1.125rem;
    color: var(--text-color);
}

.card-header p {
    margin: 0;
    color: var(--text-color);
    opacity: 0.7;
    font-size: 0.875rem;
}

.card-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-size: cover;
    background-position: center;
    flex-shrink: 0;
}

.card-content {
    padding: 1rem;
}

.card-content p {
    margin: 0;
    color: var(--text-color);
    opacity: 0.8;
    font-size: 0.875rem;
}

.card-actions {
    padding: 1rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    gap: 0.5rem;
}

.btn {
    background: none;
    border: 1px solid var(--primary-color);
    color: var(--primary-color);
    padding: 0.5rem 1rem;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.875rem;
    transition: all 0.2s ease;
}

.btn:hover {
    background-color: var(--primary-color);
    color: white;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
}

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

/* Portal Cards */
.portal-card {
    min-height: 200px;
}

.portal-card .card-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
}

.portal-info {
    display: flex;
    align-items: center;
    gap: 1rem;
    width: 100%;
}

.portal-card h3 {
    margin: 0;
}

.portal-card .card-content {
    flex-grow: 1;
    display: flex;
    align-items: center;
}

/* Toast Notifications */
.toast {
    position: fixed;
    top: 20px;
    right: 20px;
    background-color: #4caf50;
    color: white;
    padding: 1rem 1.5rem;
    border-radius: 4px;
    box-shadow: 0 2px 8px var(--shadow);
    transform: translateY(-100px);
    opacity: 0;
    transition: all 0.3s ease;
    z-index: 2000;
}

.toast.show {
    transform: translateY(0);
    opacity: 1;
}

/* Responsive Design */
@media (max-width: 768px) {
    .main-content {
        padding: 1rem;
    }

    .grid-container {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .card-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .portal-info {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }
}

@media (max-width: 480px) {
    .top-bar {
        padding: 0.75rem;
    }

    .title {
        font-size: 1.125rem;
    }

    .commit-hash {
        display: none;
    }

    .theme-toggle {
        margin-right: 0;
    }
}