:root {
    --primary-color: #2563eb; /* Vibrant blue */
    --primary-hover: #1d4ed8;
    --bg-color: #f8fafc;
    --surface-color: #ffffff;
    --text-primary: #0f172a;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --success-color: #10b981;
    --danger-color: #ef4444;
    
    --header-height: 60px;
    --nav-height: 70px;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    -webkit-tap-highlight-color: transparent; /* Remove tap highlight on mobile */
}

body {
    font-family: 'Mukta', sans-serif; /* Great font for Marathi and English */
    background-color: var(--bg-color);
    color: var(--text-primary);
    overflow-x: hidden;
}

#app {
    display: flex;
    flex-direction: column;
    height: 100vh;
}

/* Header */
.top-header {
    height: var(--header-height);
    background-color: var(--primary-color);
    color: white;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 16px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 10;
}

#app-title {
    font-size: 1.25rem;
    font-weight: 700;
}

.btn-icon {
    background: none;
    border: none;
    color: white;
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    font-family: inherit;
}

/* Main Content */
#main-content {
    margin-top: var(--header-height);
    margin-bottom: var(--nav-height);
    padding: 16px;
    flex: 1;
    overflow-y: auto;
}

/* Bottom Navigation */
.bottom-nav {
    height: var(--nav-height);
    background-color: var(--surface-color);
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: space-around;
    align-items: center;
    position: fixed;
    bottom: 0;
    width: 100%;
    padding-bottom: env(safe-area-inset-bottom); /* iOS safe area */
    box-shadow: 0 -2px 10px rgba(0,0,0,0.05);
}

.nav-item {
    background: none;
    border: none;
    display: flex;
    flex-direction: column;
    align-items: center;
    color: var(--text-secondary);
    font-family: inherit;
    font-size: 0.85rem;
    gap: 4px;
    width: 30%;
    cursor: pointer;
    transition: color 0.2s ease;
}

.nav-item.active {
    color: var(--primary-color);
    font-weight: 700;
}

/* Common UI Elements */
.card {
    background: var(--surface-color);
    border-radius: 12px;
    padding: 16px;
    margin-bottom: 16px;
    box-shadow: 0 4px 6px -1px rgba(0,0,0,0.05);
    border: 1px solid var(--border-color);
}

.btn {
    width: 100%;
    padding: 14px;
    border: none;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 700;
    font-family: inherit;
    cursor: pointer;
    text-align: center;
    transition: background 0.2s;
}

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

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

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

.input-group {
    margin-bottom: 16px;
}

.input-group label {
    display: block;
    margin-bottom: 6px;
    font-weight: 600;
    color: var(--text-secondary);
}

.input-group input, .input-group select {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    font-family: inherit;
}

.input-group input:focus {
    outline: none;
    border-color: var(--primary-color);
}

.text-center { text-align: center; }
.mb-2 { margin-bottom: 8px; }
.mb-4 { margin-bottom: 16px; }
.flex-between { display: flex; justify-content: space-between; align-items: center; }