/* --- Main Student Portal Stylesheet --- */
@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;500;600;700&display=swap');

/* --- 1. Root Variables for Branding and Consistency --- */
:root {
    --color-primary: #8C6FF7;   /* Main Brand Color */
    --color-secondary: #82D84E; /* Accent Brand Color */
    --color-success: #28c76f;
    --color-danger: #ea5455;
    --color-warning: #ff9f43;
    --color-info: #00cfe8;
    --color-dark: #4b4b4b;
    --color-body: #6e6b7b;
    --color-light-gray: #b9b9c3;
    --color-background: #f8f7fa;
    --color-white: #ffffff;
    --card-border-color: #ebe9f1;
    --card-border-radius: 0.5rem;
    --box-shadow: 0 4px 24px 0 rgba(34, 41, 47, 0.1);
    --transition: all 300ms ease;
}

/* --- 2. Global Styles --- */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Poppins', sans-serif;
}

body {
    background-color: var(--color-background);
    color: var(--color-body);
    font-size: 1rem;
}

/* --- 3. Authentication Pages (Login, Register, etc.) --- */
.auth-body {
    display: grid;
    place-items: center;
    min-height: 100vh;
    padding: 1rem;
}
.auth-container {
    width: 100%;
    max-width: 450px;
    padding: 2.5rem;
    background: var(--color-white);
    border-radius: var(--card-border-radius);
    box-shadow: var(--box-shadow);
    text-align: center;
}
.auth-container h2 {
    color: var(--color-dark);
    margin-bottom: 0.5rem;
}
.auth-container p {
    margin-bottom: 2rem;
    color: var(--color-light-gray);
}
.form-group {
    margin-bottom: 1.5rem;
    text-align: left;
}
.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
}
.form-group input, .form-group select, .form-group textarea {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--card-border-color);
    border-radius: var(--card-border-radius);
    outline-color: var(--color-primary);
}
.auth-switch {
    margin-top: 2rem;
}
.auth-switch a {
    color: var(--color-primary);
    text-decoration: none;
    font-weight: 600;
}
.password-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}
.password-wrapper input {
    width: 100%;
    padding-right: 3rem;
}
.password-toggle {
    position: absolute;
    right: 1rem;
    cursor: pointer;
    color: var(--color-light-gray);
}

/* --- 4. Main Layout (Sidebar & Content) --- */
.page-container {
    display: grid;
    grid-template-columns: 260px auto;
    min-height: 100vh;
}
.sidebar {
    background: var(--color-white);
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    border-right: 1px solid var(--card-border-color);
    transition: transform 300ms ease-in-out;
}
.sidebar .logo {
    margin-bottom: 2.5rem;
}
.logo img {
    height: 40px;
    width: auto;
    object-fit: contain;
}
.sidebar-menu {
    list-style: none;
}
.sidebar-menu a {
    text-decoration: none;
    color: var(--color-body);
    font-size: 1rem;
    padding: 0.9rem 1.2rem;
    margin-bottom: 0.5rem;
    border-radius: var(--card-border-radius);
    display: flex;
    align-items: center;
    gap: 1rem;
}
.sidebar-menu a:hover, .sidebar-menu a.active {
    background-color: var(--color-primary);
    color: var(--color-white);
}
.sidebar-menu a i {
    font-size: 1.2rem;
}
.main-content {
    padding: 1.5rem;
    overflow-y: auto;
}
.welcome-message {
    font-size: 1.8rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    color: var(--color-dark);
}

/* --- 5. Common Components (Buttons, Alerts, Cards) --- */
.btn {
    padding: 0.8rem 1.5rem;
    border: none;
    border-radius: var(--card-border-radius);
    cursor: pointer;
    font-weight: 500;
    text-decoration: none;
    display: inline-block;
    text-align: center;
    transition: var(--transition);
}
.btn-primary {
    background-color: var(--color-primary);
    color: var(--color-white);
}
.btn-primary:hover {
    transform: translateY(-2px);
}
/* NEW: Added the style rule for the secondary button */
.btn-secondary {
    background-color: var(--color-secondary);
    color: var(--color-white);
}
.btn-secondary:hover {
    transform: translateY(-2px);
}
.btn-danger { background-color: var(--color-danger); color: white; }
.btn-success { background-color: var(--color-success); color: white; }
.btn-warning { background-color: var(--color-warning); color: white; }
.btn-block { width: 100%; }

.alert {
    padding: 1rem;
    margin-bottom: 1.5rem;
    border-radius: var(--card-border-radius);
    border: 1px solid transparent;
}
.alert-danger { color: #842029; background-color: #f8d7da; border-color: #f5c2c7; }
.alert-success { color: #0f5132; background-color: #d1e7dd; border-color: #badbcc; }
.alert-warning { color: #664d03; background-color: #fff3cd; border-color: #ffecb5; }

.card {
    background: var(--color-white);
    border-radius: var(--card-border-radius);
    box-shadow: var(--box-shadow);
    margin-bottom: 1.5rem;
}
.card-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--card-border-color);
}
.card-header h3 { font-size: 1.2rem; font-weight: 600; color: var(--color-dark); }
.card-body { padding: 1.5rem; }


/* --- 6. Mobile Responsiveness & Header --- */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--color-white);
    padding: 1rem 1.5rem;
    border-radius: var(--card-border-radius);
    box-shadow: var(--box-shadow);
}
.user-profile {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 500;
}
.user-profile img {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    object-fit: cover;
}
.mobile-header { display: none; }
#sidebar-overlay { display: none; }

@media (max-width: 992px) {
    .page-container {
        grid-template-columns: 1fr;
    }
    .sidebar {
        position: fixed;
        left: 0;
        top: 0;
        height: 100%;
        z-index: 1000;
        transform: translateX(-100%);
        width: 260px;
    }
    .sidebar.sidebar-visible {
        transform: translateX(0);
    }
    .header {
        display: none;
    }
    .mobile-header {
        display: flex;
        background: var(--color-white);
        padding: 0.5rem 1.5rem;
        border-radius: var(--card-border-radius);
        box-shadow: var(--box-shadow);
        margin-bottom: 1.5rem;
        align-items: center;
        justify-content: space-between;
    }
    .menu-toggle {
        background: none;
        border: none;
        font-size: 2rem;
        cursor: pointer;
        color: var(--color-dark);
    }
    #sidebar-overlay {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background-color: rgba(0, 0, 0, 0.5);
        z-index: 999;
        opacity: 0;
        pointer-events: none;
        transition: opacity 300ms ease-in-out;
    }
    #sidebar-overlay.visible {
        opacity: 1;
        pointer-events: auto;
    }
}

/* --- 7. Footer --- */
.site-footer {
    padding: 1.5rem;
    text-align: center;
    color: var(--color-light-gray);
    font-size: 0.9rem;
    background-color: var(--color-white);
    border-top: 1px solid var(--card-border-color);
    margin-top: auto;
}