:root {
    --primary-color: #3b82f6;
    --primary-hover: #2563eb;
    --secondary-color: #10b981;
    --secondary-hover: #059669;
    --bg-color: #f8fafc;
    --text-main: #0f172a;
    --text-muted: #64748b;
    --card-bg: #ffffff;
    --border-color: #e2e8f0;
    --border-radius: 16px;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg-color: #0f172a;
        --text-main: #f8fafc;
        --text-muted: #94a3b8;
        --card-bg: #1e293b;
        --border-color: #334155;
    }
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.6;
    display: flex;
    justify-content: center;
    min-height: 100vh;
}

.app-container {
    width: 100%;
    max-width: 800px;
    padding: 24px;
    display: flex;
    flex-direction: column;
}

.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0;
    margin-bottom: 40px;
    border-bottom: 1px solid var(--border-color);
}

.app-header h1 {
    font-size: 1.75rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin: 0;
}

.logout-link {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    padding: 8px 16px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    transition: all 0.2s ease;
}

.logout-link:hover {
    color: #ef4444;
    border-color: #ef4444;
    background: rgba(239, 68, 68, 0.05);
}

.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.welcome-text {
    font-size: 1.25rem;
    color: var(--text-muted);
    margin-bottom: 32px;
    text-align: center;
    font-weight: 400;
}

.button-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
    width: 100%;
}

.card-btn {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 48px 24px;
    text-align: center;
    text-decoration: none;
    color: var(--text-main);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: var(--shadow-md);
    position: relative;
    overflow: hidden;
}

.card-btn::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: transparent;
    transition: background 0.3s ease;
}

.card-btn.primary::before {
    background: linear-gradient(90deg, var(--primary-color), #60a5fa);
    opacity: 0;
}

.card-btn.secondary::before {
    background: linear-gradient(90deg, var(--secondary-color), #34d399);
    opacity: 0;
}

.card-btn.primary:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}
.card-btn.primary:hover::before {
    opacity: 1;
}

.card-btn.secondary:hover {
    border-color: var(--secondary-color);
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}
.card-btn.secondary:hover::before {
    opacity: 1;
}

.icon-container {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.card-btn.primary .icon-container {
    color: var(--primary-color);
    background: rgba(59, 130, 246, 0.1);
}

.card-btn.secondary .icon-container {
    color: var(--secondary-color);
    background: rgba(16, 185, 129, 0.1);
}

.card-btn:hover .icon-container {
    transform: scale(1.1) rotate(5deg);
}

.icon-container svg {
    width: 40px;
    height: 40px;
}

.card-btn h3 {
    font-size: 1.35rem;
    font-weight: 600;
    margin: 0;
}

/* Styles specifically for the login form */
.card.form-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 40px;
    box-shadow: var(--shadow-lg);
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--text-muted);
}

.form-group input {
    width: 100%;
    padding: 14px;
    border: 1px solid var(--border-color);
    border-radius: 10px;
    background: var(--bg-color);
    color: var(--text-main);
    font-size: 1rem;
    transition: all 0.2s;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.15);
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
    color: white;
    border: none;
    padding: 14px 24px;
    border-radius: 10px;
    font-size: 1.05rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    box-shadow: 0 4px 6px -1px rgba(59, 130, 246, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 8px -1px rgba(59, 130, 246, 0.4);
}