:root {
    --background-color: #f7f7f7;
    --card-background-color: #ffffff;
    --text-color: #333333;
    --secondary-text-color: #666666;
    --accent-color: #066f8a; 
    --border-color: #dddddd;
    --hover-background: rgba(0, 0, 0, 0.03);
    --shadow-color: rgba(0, 0, 0, 0.1);
    --latest-pdf-color: #cc0000; /* Red for latest PDF */
    --checked-pdf-color: #4CAF50; /* Green for checked PDF */
    --modal-overlay-color: rgba(0, 0, 0, 0.7);
}

body.dark-theme {
    --background-color: #1a1a1a;
    --card-background-color: #2c2c2c;
    --text-color: #eeeeee;
    --secondary-text-color: #aaaaaa;
    --accent-color: #066f8a; 
    --border-color: #444444;
    --hover-background: rgba(255, 255, 255, 0.05);
    --shadow-color: rgba(255, 255, 255, 0.1);
    --latest-pdf-color: #ff6666; 
    --checked-pdf-color: #4CAF50; 
    --modal-overlay-color: rgba(0, 0, 0, 0.9);
}

body {
    font-family: Arial, sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    margin: 20px auto;
    max-width: 900px;
    padding: 0 15px;
    line-height: 1.6;
    transition: background-color 0.3s, color 0.3s;
}

h1, h2 {
    color: var(--accent-color);
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 5px;
    margin-top: 30px;
}

#pinned-docs {
    position: relative; 
}

#toggle-homework-btn {
    position: absolute; 
    top: 25px; 
    right: 0; 
    
    background-color: var(--accent-color);
    color: white;
    border: none;
    padding: 5px 10px;
    cursor: pointer;
    font-size: 0.8em;
    border-radius: 4px;
    transition: all 0.1s ease; 
    z-index: 10; 
    box-shadow: 0 2px 0 var(--secondary-text-color);
}

#toggle-homework-btn:hover {
    background-color: var(--accent-color);
    filter: brightness(1.1);
}

#toggle-homework-btn:active {
    transform: translateY(2px); 
    box-shadow: 0 0 0 var(--secondary-text-color);
}

.hidden {
    display: none !important;
}

/* --- Default PDF List Style (For #all-list) --- */
.pdf-list {
    margin-bottom: 20px;
}

.pdf-item {
    display: flex;
    align-items: center;
    padding: 10px;
    border-bottom: 1px solid var(--border-color);
    transition: all 0.2s ease;
    cursor: pointer;
}

.pdf-item:hover {
    background-color: var(--hover-background);
    transform: translateY(-1px);
    box-shadow: 0 2px 5px var(--shadow-color);
    border-bottom: 1px solid transparent; 
}

.pdf-item:active {
    transform: translateY(1px);
    background-color: rgba(6, 111, 138, 0.1);
    box-shadow: none;
    transition: all 0.05s ease;
}

.pdf-icon {
    width: 24px;
    height: 24px;
    margin-right: 10px;
}

.pdf-item a {
    flex-grow: 1;
    color: var(--text-color);
    text-decoration: none;
    font-weight: bold;
    transition: color 0.2s;
}

.pdf-item a:hover {
    color: var(--accent-color);
    text-decoration: underline;
}

.pdf-item .date {
    font-size: 0.9em;
    color: var(--secondary-text-color);
    white-space: nowrap;
}

/* --- Ultimul PDF Highlight --- */
.latest-pdf-highlight {
    color: var(--latest-pdf-color);
    font-weight: bold;
    margin-right: 10px;
}
.latest-pdf-row {
    border-left: 5px solid var(--latest-pdf-color);
}


/* --- Homework Section Grid/Widget Styles (#pinned-list) --- */
#pinned-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 20px;
    margin-top: 15px;
}

#pinned-list .pdf-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background-color: var(--card-background-color);
    box-shadow: 0 2px 5px var(--shadow-color);
    transition: all 0.3s ease, background-color 0.4s; /* Added background-color transition */
    cursor: pointer;
    border-bottom: none; /* Override default */
}

#pinned-list .pdf-item:hover {
    transform: translateY(-3px);
    box-shadow: 0 5px 15px var(--shadow-color);
    background-color: var(--hover-background);
}

#pinned-list .pdf-info {
    display: flex;
    align-items: center;
    flex-grow: 1;
    margin-right: 10px;
}

#pinned-list .pdf-item a {
    font-size: 1.05em;
}

/* Checked State Styles */
#pinned-list .pdf-item.checked {
    border-left: 5px solid var(--checked-pdf-color);
    background-color: rgba(76, 175, 80, 0.1); /* Light green tint */
}

/* Checkmark Button */
.check-btn {
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
    margin-left: 10px;
    transition: transform 0.2s ease;
    flex-shrink: 0;
}

.check-btn img {
    width: 20px;
    height: 20px;
    filter: grayscale(100%);
    opacity: 0.3;
    transition: filter 0.3s, opacity 0.3s, transform 0.2s;
}

.check-btn:hover img {
    opacity: 0.7;
    transform: scale(1.1);
}

.check-btn.checked img {
    filter: grayscale(0%);
    opacity: 1;
    transform: scale(1.1);
    animation: bounce 0.5s ease 1;
}


/* --- Confetti container (optional, depends on logic.js) --- */
#confetti-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 9999;
}


/* --- Modal Popup Styles --- */
#popup-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--modal-overlay-color);
    backdrop-filter: blur(5px);
    z-index: 1000;
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 0;
    transition: opacity 0.3s ease;
}

#popup-overlay.visible {
    opacity: 1;
}

#status-popup {
    background-color: var(--card-background-color);
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.5);
    max-width: 400px;
    text-align: center;
    transform: scale(0.9);
    transition: transform 0.3s ease;
}

#popup-overlay.visible #status-popup {
    transform: scale(1);
}

#status-popup h2 {
    color: var(--accent-color);
    border-bottom: none;
}

.popup-btn {
    background-color: var(--checked-pdf-color);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 5px;
    cursor: pointer;
    margin-top: 20px;
    font-weight: bold;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: background-color 0.2s;
}

.popup-btn img {
    width: 16px;
    height: 16px;
    filter: invert(100%);
}

.popup-btn:hover {
    filter: brightness(1.1);
}
/* --- End Modal Popup Styles --- */


.homework-grid {
    display: flex;
    flex-wrap: wrap; 
    gap: 20px; 
    margin-top: 15px;
    margin-bottom: 20px;
}

/* Ensure the hidden grid takes no space */
.homework-grid.hidden {
    display: none;
}

/* ... rest of the styles ... */
#pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-top: 20px;
}

#pagination button {
    background-color: var(--accent-color);
    color: white;
    border: none;
    padding: 8px 15px;
    margin: 0 10px;
    cursor: pointer;
    border-radius: 5px;
    transition: all 0.1s ease;
    box-shadow: 0 2px 0 #04566b;
}

#pagination button:disabled {
    background-color: var(--secondary-text-color);
    cursor: not-allowed;
    box-shadow: none;
    transform: none;
}

#pagination button:hover:not(:disabled) {
    filter: brightness(1.2);
}

#pagination button:active:not(:disabled) {
    transform: translateY(2px);
    box-shadow: 0 0 0 #04566b;
}

#page-number {
    font-weight: bold;
    color: var(--text-color);
}

.warning {
    background-color: #ffcccc;
    color: #cc0000;
    border: 1px solid #cc0000;
    padding: 15px;
    margin-top: 20px;
    border-radius: 5px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.warning.hidden {
    display: none;
}

.warning .close {
    background: none;
    border: none;
    color: #cc0000;
    font-size: 1.2em;
    cursor: pointer;
    transition: opacity 0.2s;
}

.homework-warning-box {
    background-color: #ffcccc;
    color: #cc0000;
    border: 1px solid #cc0000;
    padding: 10px;
    margin-bottom: 15px;
    border-radius: 5px;
    font-size: 0.9em;
    font-weight: bold;
    text-align: center;
}

.alert-box {
    background-color: #fff3cd;
    color: #856404;
    border: 1px solid #ffeeba;
    padding: 15px;
    /* Added top and bottom margin for spacing when visible */
    margin-top: 20px; 
    margin-bottom: 20px;
    border-radius: 5px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.alert-box a {
    color: #856404;
    text-decoration: underline;
    font-weight: bold;
}

.alert-box .close-alert {
    background: none;
    border: none;
    color: #856404;
    font-size: 1.2em;
    cursor: pointer;
    margin-left: 15px;
}

.alert-box .close-alert:hover {
    opacity: 0.7;
}

.maintenance-box {
    text-align: center;
    padding: 40px;
    margin: 100px auto;
    border: 2px solid #004085;
    border-radius: 8px;
    background-color: #cce5ff;
    color: #004085;
    font-size: 1.2em;
    font-weight: bold;
    max-width: 600px;
}

.maintenance-box a {
    color: #004085;
    text-decoration: underline;
}

#last-updated {
    display: block;
    margin-top: 10px;
    font-size: 0.8em;
    color: var(--secondary-text-color);
}