/**
 * Global Button Styles
 * Reusable button components for the entire application
 * 
 * Button Types:
 * - Primary (Save/Create): Green
 * - Secondary (Edit/Info): Blue
 * - Danger (Delete/Cancel): Red
 * - Ghost: Transparent with border
 * 
 * Sizes:
 * - Small: .btn-sm
 * - Regular: Default
 * - Large: .btn-lg
 */

/* Base Button Styles */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.375rem;
    padding: 0.4375rem 0.875rem;
    border: none;
    border-radius: var(--radius-md);
    font-size: 0.8125rem;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.3s ease;
    white-space: nowrap;
    outline: none;
}

.btn:hover {
    transform: translateY(-1px);
}

.btn:active {
    transform: translateY(0);
}

.btn:focus-visible {
    outline: none;
    box-shadow: 0 0 0 3px var(--color-focus-ring);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
}

/* Primary Button (Green - Save/Create/Success) */
.btn-primary {
    background: var(--btn-primary-bg);
    color: var(--color-on-brand);
}

.btn-primary:hover {
    background: var(--btn-primary-hover);
}

.btn-primary:active {
    background: var(--btn-primary-active);
}

/* Secondary Button (Blue - Edit/Info/Default) */
.btn-secondary {
    background: var(--btn-secondary-bg);
    color: var(--color-on-brand);
}

.btn-secondary:hover {
    background: var(--btn-secondary-hover);
}

.btn-secondary:active {
    background: var(--btn-secondary-active);
}

/* Danger Button (Red - Delete/Cancel/Warning) */
.btn-danger {
    background: var(--btn-danger-start);
    color: var(--color-on-brand);
}

.btn-danger:hover {
    background: var(--btn-danger-hover-start);
}

.btn-danger:active {
    background: var(--btn-danger-active-start);
}

/* Ghost Button (Transparent with border) */
.btn-ghost {
    background: transparent;
    color: var(--color-text);
    border: 1px solid var(--color-border);
    box-shadow: none;
}

.btn-ghost:hover {
    background: var(--btn-ghost-bg-hover);
    border-color: var(--color-link);
}

.btn-ghost:active {
    background: rgba(0, 0, 0, 0.05);
}

/* Button Sizes */
.btn-sm {
    padding: 0.375rem 0.75rem;
    font-size: 0.8125rem;
}

.btn-lg {
    padding: 0.625rem 1.25rem;
    font-size: 0.9375rem;
}

/* Icon Buttons */
.btn-icon {
    padding: 0.5rem;
    min-width: 2.5rem;
    min-height: 2.5rem;
    border-radius: 50%;
}

.btn-icon-sm {
    padding: 0.375rem;
    min-width: 2rem;
    min-height: 2rem;
}

/* Inline icon-action buttons — used in table rows (edit/delete) */
.btn-icon-action {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 1.75rem;
    height: 1.75rem;
    padding: 0;
    background: none;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 0.875rem;
    color: var(--color-text-muted);
    transition: background 0.15s ease, border-color 0.15s ease, color 0.15s ease;
    text-decoration: none;
    vertical-align: middle;
}

.btn-icon-action:hover {
    background: var(--color-surface-muted);
    border-color: var(--color-border);
    color: var(--color-text);
    transform: none;
    box-shadow: none;
}

.btn-icon-action:focus-visible {
    outline: none;
    box-shadow: 0 0 0 3px var(--color-focus-ring);
}

.btn-icon-action.btn-icon-danger:hover {
    background: var(--color-danger-bg);
    border-color: var(--color-danger-text);
    color: var(--color-danger-text);
}

/* Button with Icon */
.btn-with-icon {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-with-icon svg,
.btn-with-icon i {
    width: 1rem;
    height: 1rem;
}

/* Button Group */
.btn-group {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.btn-group-vertical {
    flex-direction: column;
}

.btn-group-justify {
    justify-content: space-between;
}

.btn-group-center {
    justify-content: center;
}

.btn-group-end {
    justify-content: flex-end;
}

/* Full Width Button */
.btn-block {
    width: 100%;
    display: flex;
}

/* Loading State */
.btn-loading {
    position: relative;
    color: transparent;
    pointer-events: none;
}

.btn-loading::after {
    content: '';
    position: absolute;
    width: 1rem;
    height: 1rem;
    top: 50%;
    left: 50%;
    margin-left: -0.5rem;
    margin-top: -0.5rem;
    border: 2px solid white;
    border-radius: 50%;
    border-top-color: transparent;
    animation: spin 0.6s linear infinite;
}

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

/* ========================================
   FORM STYLES - GLOBAL
   ======================================== */

/* Modal Forms - Ensure proper flex container behavior */
.modal-content form {
    display: flex;
    flex-direction: column;
    flex: 1;
    min-height: 0; /* Allow proper flex shrinking */
}

.form-group {
    display: flex;
    flex-direction: column;
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.875rem;
    font-weight: 700;
    color: var(--color-text);
}

.form-input,
.form-input[type="text"],
.form-input[type="email"],
.form-input[type="url"],
.form-input[type="tel"],
.form-input[type="password"],
.form-input[type="number"],
textarea.form-input {
    width: 100%;
    padding: 0.75rem;
    font-size: 0.9375rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    transition: all 0.2s ease;
    font-family: inherit;
    background-color: var(--color-surface);
    color: var(--color-text);
}

.form-input:focus {
    outline: none;
    border-color: var(--color-link);
    box-shadow: 0 0 0 3px var(--color-focus-ring);
}

.form-input::placeholder {
    color: var(--color-text-muted);
}

/* Form Section Subtitle */
.form-section-subtitle {
    margin: 0 0 1rem 0;
    font-size: 0.9375rem;
    color: var(--color-text-muted);
    font-weight: 500;
}

/* Permissions Grid - For checkbox lists */
.permissions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 0.75rem;
}

.permissions-grid-two-col {
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.form-row--center {
    align-items: center;
}

.form-group--flex-1 {
    flex: 1;
}

.mt-sm {
    margin-top: 0.5rem;
}

.permission-item {
    display: flex;
    align-items: center;
    gap: 0.625rem;
    padding: 0.75rem;
    background: var(--color-surface-muted);
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-border);
    transition: all 0.2s ease;
}

.permission-item:hover {
    background: var(--btn-ghost-bg-hover);
    border-color: var(--color-link);
}

.permission-item input[type="checkbox"] {
    width: 1.125rem;
    height: 1.125rem;
    cursor: pointer;
    accent-color: var(--color-link);
}

.permission-item input[type="radio"] {
    width: 1.125rem;
    height: 1.125rem;
    cursor: pointer;
    accent-color: var(--color-link);
}

.permission-item label {
    cursor: pointer;
    margin: 0;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text);
    user-select: none;
}

/* ========================================
   FORM ROW - Side-by-side form fields
   ======================================== */
.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-bottom: 1rem;
}

.form-row:last-child {
    margin-bottom: 0;
}

.form-row .form-group {
    margin-bottom: 0;
}

/* Form Error */
.form-error {
    display: block;
    margin-top: 0.25rem;
    font-size: 0.8125rem;
    color: var(--color-danger-text);
}

/* Form Checklist — selectable list with checkboxes (e.g. course selection modal) */
.form-checklist {
    display: flex;
    flex-direction: column;
    gap: 0.375rem;
    max-height: 260px;
    overflow-y: auto;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    padding: 0.5rem;
}

.form-checklist-item {
    display: flex;
    align-items: center;
    gap: 0.625rem;
    padding: 0.5rem 0.625rem;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: background-color 0.15s ease;
    font-size: 0.875rem;
    color: var(--color-text);
}

.form-checklist-item:hover {
    background-color: var(--color-surface-muted);
}

.form-checklist-item input[type="checkbox"] {
    width: 1rem;
    height: 1rem;
    flex-shrink: 0;
    accent-color: var(--color-link);
    cursor: pointer;
}

.form-checklist-item.is-checked {
    background-color: rgba(20, 55, 95, 0.06);
}

.form-checklist-toggle {
    font-size: 0.8125rem;
    color: var(--color-link);
    cursor: pointer;
    background: none;
    border: none;
    padding: 0;
    text-decoration: underline;
    text-align: left;
}

.form-checklist-toggle:hover {
    color: var(--color-text);
}

.form-inline-option {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    color: var(--color-text);
    cursor: pointer;
}

.form-hint {
    font-size: 0.8125rem;
    color: var(--color-text-muted);
    margin-top: 0.5rem;
    line-height: 1.4;
}

.form-checklist-meta {
    display: block;
    font-size: 0.75rem;
    color: var(--color-text-muted);
    margin-top: 0.15rem;
    padding-left: 1.5rem;
    line-height: 1.4;
}

.form-checklist-meta .meta-invoiced {
    display: inline-block;
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--color-on-brand);
    background-color: var(--color-link);
    padding: 0.1rem 0.4rem;
    border-radius: 3px;
    margin-left: 0.35rem;
    vertical-align: middle;
}

.form-checklist-meta .meta-paid {
    color: var(--color-success-text);
    font-weight: 600;
}

.form-checklist-meta .meta-missing-amount {
    color: var(--color-danger-text);
    font-weight: 600;
}

/* ─── Per-course invoice fields (amount / method / installment) ─────────── */

.inv-course-item {
    border-bottom: 1px solid var(--color-border);
}

.inv-course-item:last-child {
    border-bottom: none;
}

.inv-item-fields {
    display: none;
    padding: 0.5rem 0 0.75rem 1.75rem;
}

.inv-item-fields.active {
    display: block;
}

.inv-item-fields-row {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.inv-item-fields-row .form-group {
    margin: 0;
}

.inv-item-fields-row .form-label {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    margin-bottom: 0.2rem;
    display: block;
}

.inv-amount-input {
    width: 100%;
}

.inv-item-fields-row select.form-input {
    width: 100%;
}

.inv-installment-label {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.85rem;
    cursor: pointer;
    padding-top: 0.35rem;
}

.inv-zero-warning {
    font-size: 0.75rem;
    color: var(--color-danger-text);
    margin-top: 0.15rem;
    display: none;
}

.inv-zero-warning.visible {
    display: block;
}

@media (min-width: 480px) {
    .inv-item-fields-row {
        flex-direction: row;
        align-items: flex-start;
    }

    .inv-item-fields-row .form-group:first-child {
        width: 110px;
        flex-shrink: 0;
    }

    .inv-item-fields-row .form-group:nth-child(2) {
        flex: 1;
    }

    .inv-item-fields-row .form-group:last-child {
        flex-shrink: 0;
        padding-top: 1.25rem;
    }
}

@media (min-width: 768px) {
    .inv-item-fields {
        padding-left: 2rem;
    }

    .inv-item-fields-row .form-group:first-child {
        width: 130px;
    }
}

.form-inline-option input[type="checkbox"] {
    width: 1rem;
    height: 1rem;
    accent-color: var(--color-link);
    cursor: pointer;
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .btn {
        padding: 0.5rem 1rem;
        font-size: 0.875rem;
    }
    
    .btn-lg {
        padding: 0.625rem 1.25rem;
        font-size: 0.9375rem;
    }
    
    .btn-sm {
        padding: 0.375rem 0.75rem;
        font-size: 0.8125rem;
    }
    
    .btn-group {
        gap: 0.5rem;
    }
    
    /* Permissions grid mobile */
    .permissions-grid {
        grid-template-columns: 1fr;
        gap: 0.5rem;
    }
    
    .permission-item {
        padding: 0.625rem;
    }
    
    .permission-item input[type="checkbox"] {
        width: 1rem;
        height: 1rem;
    }
    
    .permission-item label {
        font-size: 0.8125rem;
    }

    .form-checklist {
        max-height: 200px;
    }

    .form-checklist-item {
        font-size: 0.8125rem;
        padding: 0.4375rem 0.5rem;
    }
    
    /* Stack buttons on very small screens */
    @media (max-width: 480px) {
        .btn-group-mobile-stack {
            flex-direction: column;
        }
        
        .btn-group-mobile-stack .btn {
            width: 100%;
        }
    }
}

/* ============================================================
   Action Menu — reusable dropdown for grouped page actions
   Usage: <div class="action-menu" id="myMenu">
            <button class="btn btn-secondary action-menu-trigger"
                    onclick="toggleActionMenu('myMenu')">Aktionen ▾</button>
            <div class="action-menu-dropdown">
              <span class="action-menu-group-label">Gruppe</span>
              <button class="action-menu-item" onclick="...">Item</button>
              <div class="action-menu-divider"></div>
            </div>
          </div>
   ============================================================ */
/* Trigger always uses compact (btn-sm equivalent) sizing — global rule,
   no template should need to add btn-sm manually */
.action-menu-trigger {
    padding: 0.375rem 0.75rem;
    font-size: 0.8125rem;
}

.action-menu-trigger:focus-visible {
    outline: none;
    box-shadow: 0 0 0 3px var(--color-focus-ring);
}

.action-menu {
    position: relative;
    display: inline-block;
}

.action-menu-dropdown {
    display: none;
    position: absolute;
    right: 0;
    top: calc(100% + 6px);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    box-shadow: 0 6px 20px var(--color-shadow);
    min-width: 230px;
    z-index: 900;
    flex-direction: column;
    padding: 0.3rem 0;
    animation: actionMenuFadeIn 0.15s ease;
}

.action-menu-dropdown.menu-open-left {
    right: 0;
    left: auto;
}

.action-menu-dropdown.menu-open-right {
    left: 0;
    right: auto;
}

.action-menu-dropdown.active {
    display: flex;
}

@keyframes actionMenuFadeIn {
    from { opacity: 0; transform: translateY(-6px); }
    to   { opacity: 1; transform: translateY(0); }
}

.action-menu-group-label {
    padding: 0.6rem 1rem 0.2rem;
    font-size: 0.7rem;
    font-weight: 700;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    cursor: default;
}

.action-menu-item {
    background: none;
    border: none;
    padding: 0.6rem 1rem;
    text-align: left;
    cursor: pointer;
    font-size: 0.9rem;
    color: var(--color-text);
    transition: background 0.12s ease, color 0.12s ease;
    white-space: nowrap;
    width: 100%;
}

.action-menu-item:hover:not(:disabled) {
    background: var(--btn-ghost-bg-hover);
    color: var(--color-link);
}

.action-menu-item:focus-visible {
    outline: none;
    background: var(--btn-ghost-bg-hover);
    box-shadow: inset 0 0 0 1px var(--color-border);
}

.action-menu-item:disabled {
    color: var(--color-text-muted);
    cursor: not-allowed;
    opacity: 0.6;
}

.action-menu-divider {
    height: 1px;
    background: var(--color-border);
    margin: 0.3rem 0;
}

/* Mobile: keep dropdown attached to trigger (not bottom-sheet) */
@media (max-width: 768px) {
    .action-menu {
        position: relative;
    }
    .action-menu-dropdown {
        position: absolute;
        top: calc(100% + 6px);
        bottom: auto;
        width: max-content;
        min-width: min(230px, calc(100vw - 1.25rem));
        max-width: min(320px, calc(100vw - 1.25rem));
        max-height: min(62vh, 460px);
        overflow-y: auto;
    }

    .action-menu-dropdown.menu-open-left {
        right: 0;
        left: auto;
    }

    .action-menu-dropdown.menu-open-right {
        left: 0;
        right: auto;
    }
}