:root{
    --btn-blue: #3068d9;
    --btn-blue-hover: #94b8ff;
    --btn-green: #28a745;
    --btn-green-hover: #1e7e34;
    --btn-danger: #dc3545;
    --btn-danger-hover: #c82333;
    --btn-radius: 0.4rem;
    --btn-font-size: 12px;
    --btn-padding: 0.5rem 1rem;
    --transition-fast: 0.2s ease;
    --transition-med: 0.3s ease;
    --text-on-light-hover: #000;
    --text-on-dark: #fff;
    --button-height: auto;
}

/* ---------- Base button (blue) ---------- */

.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    background-color: var(--btn-blue);
    color: var(--text-on-dark);
    font-size: var(--btn-font-size);
    font-weight: 700;
    letter-spacing: .1rem;
    padding: var(--btn-padding);
    text-transform: uppercase;
    white-space: nowrap;
    text-decoration: none;
    border: none;
    border-radius: var(--btn-radius);
    cursor: pointer;
    transition: background-color var(--transition-med), color var(--transition-fast), transform var(--transition-fast);
    margin: 5px 5px 5px auto;
    height: var(--button-height);
}

/* hover / focus */
.button:hover,
.button:focus {
    background-color: var(--btn-blue-hover);
    color: var(--text-on-light-hover);
    outline: none;
    transform: translateY(-1px);
}
.button:focus-visible {
    box-shadow: 0 0 0 3px rgba(48,104,217,0.18);
}

/* ---------- Variants ---------- */
.button-danger {
    background-color: var(--btn-danger);
    border: 1px solid rgba(0,0,0,0.05);
}
.button-danger:hover,
.button-danger:focus {
    background-color: var(--btn-danger-hover);
    color: var(--text-on-dark);
}

.button-green {
    background-color: var(--btn-green);
    border: 1px solid rgba(0,0,0,0.04);
}

.button-green:hover,
.button-green:focus {
    background-color: var(--btn-green-hover);
    color: var(--text-on-dark);
}

.buttons-group {
    display:inline-flex;
    justify-content:center;
    gap:5px;
}

/*Buttons for login and register page*/

.buttons-group-login {
    display:flex;
    justify-content:center;
    gap:5px;
}

.button-login {
    width:100%;
    font-size: 16px;
    font-family: 'Montserrat', sans-serif;
    padding: 12px;
    margin:12px 0px 15px auto;
}

.button-sign-up {
    width:50%;
    border: 1px solid #81a5ff;
    background-color: transparent;
    color: #292929;
    font-size: 16px;
    font-family: 'Montserrat', sans-serif;
    padding: 12px;
    margin:12px 0px 15px auto;
}

.button-sign-up:hover {
    background-color: #c6d8ff;
    color: #fff;
}

.button-register {
    width:40%;
    display: block;
    margin:40px auto 0 auto;
}

/* Add course button */

.add-button {
    width: 25px;
    height: 25px;
    overflow: hidden;
    display: inline-flex;
    align-items: center;
    justify-content: left;
    padding: 0;
    border-radius: 5px;
    color: white;
    text-decoration: none;
    font-family: sans-serif;
    transition: width 0.3s ease, justify-content 0.3s ease, background-color 0.2s;
}

.add-button .button-icon-wrapper {
    width: 25px;
    height: 25px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.add-button .button-text {
    color:#fff;
    font-size:12px;
    white-space: nowrap;
    padding: 0 15px 0 5px;
    opacity: 0;
    flex-shrink: 0;
    transition: opacity 0.2s 0.1s;
}

.add-button:hover {
    justify-content: flex-start;
    width: 180px;
    transition: width 0.3s ease, justify-content 0.3s ease, background-color 0.2s;
}

.add-button:hover .button-text {
    opacity: 1;
}

/* Back button */

.back-button {
    position: absolute;
    left: 16px;
    top: 14px;
    font-size: 16px;
    font-weight: 600;
    color: #000;
    padding: 6px 10px;
}

.back-button:hover {
    color: #0056b3;
}


/*Buttons for courses */
.delete-button {
    height: var(--button-height);
    padding: var(--btn-padding);
    font-size: var(--btn-font-size);
    border:1px solid;
    border-radius: var(--btn-radius);
    transition:0.3s ease;
    margin: 5px 5px 5px auto;
}

.delete-button:hover {
    transition:0.3s ease;
}

.delete-button-outline-danger {
    color:#dc3545;
    border-color: #dc3545;
}

.delete-button-outline-danger:hover {
    background:#dc3545;
    color:#fff;
}


/* Mark completed buttons */

.button-mark-completed,
.button-mark-uncompleted {
    display: inline-block;
    padding: 6px 14px;
    border-radius: 40px;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    transition: all 0.25s ease;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
    line-height: 1.2;
}
/* Mark Completed (green outline) */
.button-mark-completed {
    background-color: #f9fff9;
    border: 2px solid #28a745;
    color: #28a745;
}

.button-mark-completed:hover {
    background-color: #28a745;
    color: #fff;
    box-shadow: 0 4px 10px rgba(40, 167, 69, 0.3);
    transform: translateY(-1px);
}

/* Mark Uncompleted (red outline) */
.button-mark-uncompleted {
    background-color: #fff8f8;
    border: 2px solid #dc3545;
    color: #dc3545;
}

.button-mark-uncompleted:hover {
    background-color: #dc3545;
    color: #fff;
    box-shadow: 0 4px 10px rgba(220, 53, 69, 0.3);
    transform: translateY(-1px);
}