/* Global */
body {
    font-family: 'Montserrat', sans-serif;
    margin: 0;
    background: #f5f7fa;
    color: #333;
}

/* Sidebar */
.sidebar {
    width: 220px;
    height: 100vh;
    background: #1e3a8a;
    color: #fff;
    position: fixed;
    top: 0;
    left: 0;
    display: flex;
    flex-direction: column;
    padding-top: 20px;
}
.sidebar a {
    padding: 15px 20px;
    text-decoration: none;
    color: #fff;
    font-weight: 600;
    transition: 0.3s;
}
.sidebar a:hover {
    background: #2c50c7;
    border-radius: 8px;
}

/* Main Content */
.main {
    margin-left: 240px;
    padding: 20px;
}

/* Dashboard grid */
.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

/* Dashboard card */
.dashboard-card {
    background: #e6f0ff;
    border-radius: 12px;
    padding: 20px;
    box-shadow: 0 3px 10px rgba(0,0,0,0.12);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    transition: transform 0.2s, box-shadow 0.2s;
}
.dashboard-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 6px 20px rgba(0,0,0,0.18);
}
.dashboard-card h3 {
    margin-bottom: 15px;
    font-size: 1.1rem;
}
.dashboard-card a {
    display: inline-block;
    text-align: center;
    padding: 12px 20px;
    border-radius: 12px;
    font-weight: 700;
    color: #fff;
    text-decoration: none;
    background: linear-gradient(135deg, #1e3a8a, #2c50c7);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    transition: all 0.25s ease;
}
.dashboard-card a:hover {
    background: linear-gradient(135deg, #2c50c7, #1e3a8a);
    transform: scale(1.05);
    box-shadow: 0 6px 15px rgba(0,0,0,0.2);
}

/* Grid Cards */
.lesson-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 20px;
    margin-top: 20px;
}
.lesson-card {
    background: #e6f0ff;
    border-radius: 12px;
    padding: 20px;
    box-shadow: 0 3px 8px rgba(0,0,0,0.1);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    transition: transform 0.2s;
}
.lesson-card:hover {
    transform: translateY(-4px);
}
.lesson-card h3 {
    margin-bottom: 10px;
}

/* Start Lesson Button */
.lesson-card a.start-lesson-btn {
    margin-top: 15px;
    text-align: center;
    display: inline-block;
    padding: 12px 20px;               
    border-radius: 12px;              
    background: linear-gradient(135deg, #1e3a8a, #2c50c7);  
    color: #fff;
    font-weight: 700;                  
    text-decoration: none;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);  
    transition: all 0.25s ease;        
}
.lesson-card a.start-lesson-btn:hover {
    background: linear-gradient(135deg, #2c50c7, #1e3a8a);  
    transform: scale(1.05);             
    box-shadow: 0 6px 15px rgba(0,0,0,0.2);
}

/* Lesson Page Sections */
.lesson-section {
    padding: 15px;
    margin-top: 15px;
    background: #e6f0ff;
    border-radius: 10px;
}

/* Lesson Page Buttons (Downloads, Expressions, Exercises, etc.) */
.lesson-options button,
.lesson-options a {
    margin-right: 10px;
    margin-bottom: 10px;
    padding: 10px 18px;
    border: none;
    border-radius: 12px;
    cursor: pointer;
    font-weight: 700;
    background: linear-gradient(135deg, #1e3a8a, #2c50c7);
    color: #fff;
    text-decoration: none;
    transition: all 0.25s ease;
}
.lesson-options button:hover,
.lesson-options a:hover {
    background: linear-gradient(135deg, #2c50c7, #1e3a8a);
    transform: scale(1.05);
    box-shadow: 0 6px 15px rgba(0,0,0,0.2);
}

/* Dialog Cards */
.dialog-card {
    background: #e6f0ff;
    border-radius: 12px;
    padding: 15px;
    margin-bottom: 15px; 
    line-height: 1.5;
    box-shadow: 0 2px 6px rgba(0,0,0,0.08);
    transition: transform 0.1s;
}
.dialog-card:hover { 
    transform: translateY(-2px); 
}
.dialog-card .speaker {
    font-weight: bold;
    color: #1e3a8a;
    display: block;
    margin-bottom: 5px;
}

/* Vocabulary Table */
table.vocab-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 10px;
}
table.vocab-table th, table.vocab-table td {
    border: 1px solid #ccc;
    padding: 8px 12px;
    text-align: left;
}
table.vocab-table th { 
    background: #1e3a8a; 
    color: #fff; 
}
table.vocab-table tr:nth-child(even) { 
    background: #f9f9f9; 
}

/* Custom Audio Player */
.custom-audio-player {
    display: flex;
    align-items: center;
    background: #1e3a8a;
    padding: 12px 15px;
    border-radius: 12px;
    color: #fff;
    margin-top: 15px;
    margin-bottom: 20px;
    box-shadow: 0 3px 10px rgba(0,0,0,0.15);
}
.custom-audio-player button {
    background: #ffcc00;
    border: none;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    cursor: pointer;
    font-weight: bold;
    margin-right: 15px;
}
.custom-audio-player .progress-container {
    flex: 1;
    background: #ccc;
    height: 6px;
    border-radius: 3px;
    margin-right: 15px;
    position: relative;
}
.custom-audio-player .progress {
    height: 100%;
    background: #ffcc00;
    width: 0%;
    border-radius: 3px;
}
.custom-audio-player #time { font-weight: bold; }
.custom-audio-player:hover {
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
    transform: translateY(-2px);
    transition: all 0.2s ease;
}