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

:root {
    --primary: #0066cc;
    --primary-dark: #004d99;
    --bg: #f5f7fa;
    --card-bg: #ffffff;
    --text: #1a1a2e;
    --text-muted: #6b7280;
    --border: #e5e7eb;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --radius: 12px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
}

.screen { display: none; }
.screen.active { display: flex; }
.hidden { display: none !important; }

/* Login */
#login-screen {
    min-height: 100vh;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #0066cc 0%, #004d99 100%);
}

.login-container {
    background: white;
    padding: 2.5rem;
    border-radius: var(--radius);
    width: 100%;
    max-width: 380px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.15);
}

.login-logo {
    text-align: center;
    margin-bottom: 2rem;
}

.login-logo h1 {
    font-size: 1.8rem;
    color: var(--primary);
}

.login-logo p {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    font-size: 0.85rem;
    font-weight: 500;
    margin-bottom: 0.4rem;
    color: var(--text);
}

.form-group input {
    width: 100%;
    padding: 0.7rem 1rem;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 0.95rem;
    transition: border-color 0.2s;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(0,102,204,0.1);
}

.btn {
    padding: 0.6rem 1.2rem;
    border: none;
    border-radius: 8px;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}

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

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

.btn-full { width: 100%; padding: 0.8rem; margin-top: 0.5rem; }

.btn-sm { padding: 0.4rem 0.8rem; font-size: 0.8rem; background: rgba(255,255,255,0.2); color: white; }
.btn-sm:hover { background: rgba(255,255,255,0.3); }

.error-msg {
    margin-top: 1rem;
    padding: 0.7rem;
    background: #fef2f2;
    color: var(--danger);
    border-radius: 8px;
    font-size: 0.85rem;
    text-align: center;
}

/* Main App */
#main-screen {
    flex-direction: column;
    min-height: 100vh;
}

.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.5rem;
    background: var(--primary);
    color: white;
}

.app-header h2 { font-size: 1.2rem; }

.header-right {
    display: flex;
    align-items: center;
    gap: 1rem;
    font-size: 0.85rem;
}

.app-main {
    flex: 1;
    padding: 1.5rem;
    max-width: 600px;
    margin: 0 auto;
    width: 100%;
}

/* Quick Actions */
.quick-actions {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.action-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    padding: 1.5rem 1rem;
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    cursor: pointer;
    transition: all 0.2s;
    font-family: inherit;
}

.action-card:hover {
    border-color: var(--primary);
    box-shadow: 0 4px 12px rgba(0,102,204,0.1);
    transform: translateY(-2px);
}

.action-card:active {
    transform: translateY(0);
}

.action-icon { font-size: 2rem; }
.action-label { font-size: 0.9rem; font-weight: 500; color: var(--text); }

#module-content {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem;
    min-height: 200px;
}

.placeholder-text {
    color: var(--text-muted);
    text-align: center;
    padding: 3rem 0;
}