:root {
    /* Color Palette - Child Friendly & Premium */
    --color-bg: #E0F7FA;
    --color-surface: #ffffff;
    --color-primary: #6366f1;
    /* Indigo */
    --color-primary-light: #818cf8;
    --color-secondary: #ec4899;
    /* Pink */
    --color-accent: #8b5cf6;
    /* Violet */
    --color-text: #1e293b;
    --color-text-muted: #64748b;
    --color-border: #e2e8f0;

    /* Spacing & Radius */
    --radius-xl: 32px;
    --radius-lg: 24px;
    --radius-md: 16px;
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;

    /* Fonts */
    --font-main: 'Outfit', sans-serif;

    /* Animation */
    --bounce: cubic-bezier(0.34, 1.56, 0.64, 1);
}

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

body {
    font-family: var(--font-main);
    background-color: var(--color-bg);
    color: var(--color-text);
    height: 100vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    font-size: 16px;
    /* Base for rem */
}

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

/* --- Header (Top Bar) --- */
.main-header {
    background: transparent;
    padding: var(--spacing-md) var(--spacing-lg);
    display: flex;
    justify-content: center;
    /* Center Logo */
    align-items: center;
    position: relative;
    z-index: 10;
}

.logo {
    font-size: 1.8rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: -0.5px;
}

/* Navigation (Bottom Tab Bar for Mobile) */
nav {
    display: flex;
    justify-content: space-around;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    padding: var(--spacing-sm);
    position: fixed;
    bottom: 20px;
    left: 20px;
    right: 20px;
    border-radius: var(--radius-xl);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
    z-index: 100;
    gap: var(--spacing-xs);
    border: 1px solid rgba(255, 255, 255, 0.5);
}

.nav-btn {
    background: transparent;
    border: none;
    font-family: var(--font-main);
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-text-muted);
    cursor: pointer;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-lg);
    transition: all 0.3s var(--bounce);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    flex: 1;
}

.nav-btn:active {
    transform: scale(0.9);
}

.nav-btn.active {
    background: var(--color-primary);
    color: white;
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

/* --- Main Content --- */
#main-content {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    padding: var(--spacing-lg);
    padding-bottom: 100px;
    /* Space for Bottom Nav */
    width: 100%;
    max-width: 800px;
    /* Tablet constraint */
    margin: 0 auto;
}

.view {
    animation: slideUp 0.4s var(--bounce);
}

.view.hidden {
    display: none;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px) scale(0.95);
    }

    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

h1 {
    font-size: 2rem;
    margin-bottom: var(--spacing-lg);
    color: var(--color-text);
    text-align: center;
}

/* --- Forms (Child Friendly) --- */
textarea,
input,
select {
    width: 100%;
    padding: var(--spacing-md);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    font-family: var(--font-main);
    font-size: 1.1rem;
    /* Larger text */
    margin-bottom: var(--spacing-md);
    transition: border-color 0.2s;
    background: var(--color-surface);
}

textarea:focus,
input:focus,
select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.1);
}

button {
    cursor: pointer;
    font-family: var(--font-main);
    user-select: none;
}