/* ======================================== */
/* A.I.U. Main Stylesheet (aiu-main.css)    */
/* ======================================== */

/* --- 1. Global Styles & Variables --- */
:root {
    --aiu-bg: #0f172a; /* Deep navy blue */
    --aiu-surface: #1e293b; /* Slate blue */
    --aiu-border: #334155; /* Muted slate */
    --aiu-text-primary: #e2e8f0; /* Light slate gray */
    --aiu-text-secondary: #94a3b8; /* Muted slate gray */
    --aiu-primary: #a855f7; /* Purple */
    --aiu-primary-dark: #7c3aed; /* Darker purple */
    --aiu-accent: #10b981; /* Green for success */
    --aiu-font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
}

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

body {
    font-family: var(--aiu-font-sans);
    background-color: var(--aiu-bg);
    color: var(--aiu-text-primary);
    margin: 0;
    line-height: 1.6;
}

/* --- 2. Layout Containers --- */
.aiu-container {
    max-width: 800px;
    margin: 0 auto;
    padding: 40px 20px;
    width: 100%;
}

.menu-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: 40px 20px;
}

/* --- 3. Typography --- */
h1 {
    font-size: clamp(2.5rem, 6vw, 3.5rem);
    font-weight: 800;
    color: #ffffff;
    margin-bottom: 20px;
    text-shadow: 0 0 30px rgba(168, 85, 247, 0.3);
}

h2 {
    font-size: 1.5rem;
    font-weight: 700;
    color: #ffffff;
    margin-bottom: 10px;
}

p {
    font-size: 1.1rem;
    color: var(--aiu-text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

p.subtitle {
    font-size: 1.25rem;
    margin-bottom: 40px;
}

a {
    color: var(--aiu-primary);
    text-decoration: none;
    transition: color 0.3s ease;
}

a:hover {
    color: #c084fc; /* Lighter purple */
}

/* --- 4. Buttons --- */
.btn {
    display: inline-block;
    padding: 14px 32px;
    border-radius: 50px;
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    text-align: center;
    transition: all 0.3s ease;
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--aiu-primary-dark), var(--aiu-primary));
    color: #ffffff;
    box-shadow: 0 4px 20px rgba(168, 85, 247, 0.3);
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(168, 85, 247, 0.4);
}

.btn-secondary {
    background: var(--aiu-surface);
    color: var(--aiu-text-primary);
    border: 1px solid var(--aiu-border);
}

.btn-secondary:hover:not(:disabled) {
    background-color: #334155;
    border-color: #475569;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* --- 5. Menu Page Specifics --- */
.menu-header {
    text-align: center;
    margin-bottom: 50px;
}

.menu-header .header-icon {
    font-size: 4rem;
    margin-bottom: 10px;
    line-height: 1;
}

.menu-options {
    display: flex;
    flex-direction: column;
    gap: 20px;
    width: 100%;
    max-width: 450px;
}

.menu-card {
    background: var(--aiu-surface);
    border: 1px solid var(--aiu-border);
    border-radius: 16px;
    padding: 25px;
    display: flex;
    align-items: center;
    gap: 20px;
    text-decoration: none;
    color: var(--aiu-text-primary);
    transition: all 0.3s ease;
    text-align: left;
}

.menu-card:hover {
    transform: translateY(-5px);
    border-color: var(--aiu-primary);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.menu-card.primary-card {
    border-color: var(--aiu-primary-dark);
    background: linear-gradient(135deg, rgba(124, 58, 237, 0.1), rgba(168, 85, 247, 0.1));
}

.card-icon {
    font-size: 2.5rem;
    flex-shrink: 0;
}

.card-content h2 {
    font-size: 1.25rem;
    margin-bottom: 5px;
}

.card-content p {
    font-size: 0.95rem;
    margin: 0;
}

.card-arrow {
    margin-left: auto;
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--aiu-text-secondary);
    transition: transform 0.3s ease;
}

.menu-card:hover .card-arrow {
    transform: translateX(5px);
    color: var(--aiu-primary);
}

.menu-footer {
    margin-top: 50px;
    text-align: center;
}

.back-link {
    color: var(--aiu-text-secondary);
    font-weight: 500;
}

.back-link:hover {
    color: var(--aiu-text-primary);
}

/* --- 6. Utility Classes (Spinners, Forms) --- */
.spinner {
    display: inline-block;
    border: 3px solid rgba(255, 255, 255, 0.2);
    border-top-color: var(--aiu-primary);
    border-radius: 50%;
    width: 20px;
    height: 20px;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.form-group {
    margin-bottom: 20px;
    text-align: left;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    font-size: 0.9rem;
}

.form-input {
    width: 100%;
    padding: 12px 15px;
    background: var(--aiu-bg);
    border: 1px solid var(--aiu-border);
    border-radius: 8px;
    color: var(--aiu-text-primary);
    font-size: 1rem;
    transition: border-color 0.3s, box-shadow 0.3s;
}

.form-input:focus {
    outline: none;
    border-color: var(--aiu-primary);
    box-shadow: 0 0 0 3px rgba(168, 85, 247, 0.2);
}

/* --- 7. Responsive Design --- */
@media (max-width: 600px) {
    h1 {
        font-size: 2.5rem;
    }

    .aiu-container,
    .menu-container {
        padding: 20px 15px;
    }

    .menu-header {
        margin-bottom: 40px;
    }

    .menu-options {
        gap: 15px;
    }

    .menu-card {
        padding: 20px;
        gap: 15px;
    }

    .card-icon {
        font-size: 2rem;
    }

    .card-content h2 {
        font-size: 1.1rem;
    }
}