/* === LEGACY COMPATIBILITY - FLEXIBLE HEIGHT === */

/* Planner icon assets live beside this component directory. Keeping URL-valued
   custom properties here is important: browsers resolve a variable's relative
   URL from the stylesheet that consumes it. */
:root {
    --icon-semester-delete: url('../assets/closedb.png');
    --icon-semester-drag: url('../assets/dragb.png');
    --icon-semester-edit: url('../assets/editb.png');
    --icon-course-delete: url('../assets/closedb.png');
    --icon-delete-hover: url('../assets/open.png');
    --icon-delete-hover-filter: invert(18%) sepia(98%) saturate(7492%) hue-rotate(357deg) brightness(97%) contrast(119%);
    --icon-confirm: url('../assets/tickw.png');
    --icon-confirm-hover: url('../assets/tickb.png');
}

/* Planner hydration remains visible until persisted semester cards are ready. */
.planner-loading-state {
    position: absolute;
    inset: 0;
    z-index: 2;
    display: grid;
    place-content: center;
    justify-items: center;
    gap: 12px;
    min-width: 100%;
    min-height: 100%;
    padding: 24px;
    box-sizing: border-box;
    background: var(--bg-main);
    color: var(--text-secondary);
    text-align: center;
    pointer-events: none;
}

.planner-loading-state[hidden] {
    display: none !important;
}

.planner-loading-spinner {
    width: 30px;
    height: 30px;
    box-sizing: border-box;
    border: 3px solid color-mix(in srgb, var(--primary) 18%, var(--border));
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: planner-loading-spin 0.8s linear infinite;
}

.planner-loading-message {
    max-width: 32rem;
    font-size: 0.9rem;
    font-weight: 600;
    line-height: 1.4;
}

.planner-loading-state[data-state="error"] {
    color: var(--state-danger);
}

.planner-loading-state[data-state="error"] .planner-loading-spinner {
    display: none;
}

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

/* Each semester column - FLEX LAYOUT USING AVAILABLE HEIGHT */
.container_semester {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    margin: 16px 8px;
    flex: 0 0 var(--semester-width);
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    height: 95%; /* Take remaining height between header and footer */
}

/* Placeholder container for adding new semesters inline */
.add-semester-ghost {
    margin: 16px 8px;
    flex: 0 0 var(--semester-width);
    border: 2px dashed var(--border);
    border-radius: var(--radius-md);
    height: 95%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    cursor: pointer;
    box-shadow: var(--shadow-sm);
}

.add-semester-ghost:hover {
    background: var(--bg-surface);
}

/* Top bar showing total credits */
.container_semester .total_credit {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 8px;
    background: var(--primary);
    color: var(--text-inverse);
    font-weight: 600;
    flex-shrink: 0;
}

.container_semester.current-term {
    border-color: color-mix(in srgb, var(--accent) 55%, var(--border));
    box-shadow: 0 0 0 1px color-mix(in srgb, var(--accent) 35%, transparent), var(--shadow-sm);
}

.container_semester.current-term .total_credit {
    background: var(--accent);
}

.container_semester .total_credit_line {
    flex: 1;
    height: 1px;
    background: var(--alpha-white-30);
}

.container_semester .total_credit_text {
    padding: 0 8px;
}

.container_semester .total_credit_text span.is-overlimit {
    color: var(--tone-danger-500);
    font-weight: 800;
    text-shadow: 0 1px 0 var(--alpha-black-18);
}

/* Body container - PROPER FLEX LAYOUT */
.subcontainer_semester {
    display: flex;
    flex-direction: column;
    padding: 12px;
    gap: 12px;
    flex: 1; /* Take remaining space */
    overflow: hidden; /* Hide overflow from this container */
    min-height: 0; /* Allow shrinking */
}

/* Date row with term label and action icons */
.subcontainer_semester .date {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-weight: 600;
    color: var(--text-primary);
    flex-shrink: 0;
}

.subcontainer_semester .date p {
    margin: 0;
}

/* Icons container */
.subcontainer_semester .icons {
    display: flex;
    gap: 8px;
}

.subcontainer_semester .semester_drag,
.subcontainer_semester .semester_date_edit,
.subcontainer_semester .delete_semester,
.subcontainer_semester .semester_move {
    width: 20px;
    height: 20px;
    border: none;
    background: transparent;
    cursor: pointer;
    opacity: 0.6;
    transition: opacity 0.15s ease;
    background-repeat: no-repeat;
    background-position: center;
    background-size: contain;
}

.subcontainer_semester .semester_move {
    color: var(--text-secondary);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
}

.subcontainer_semester .delete_semester {
    background-image: var(--icon-semester-delete);
}
.subcontainer_semester .semester_drag {
    background-image: var(--icon-semester-drag);
}
.subcontainer_semester .semester_date_edit {
    background-image: var(--icon-semester-edit);
}

.subcontainer_semester .semester_drag,
.subcontainer_semester .semester_date_edit,
.subcontainer_semester .delete_semester {
    filter: var(--planner-semester-icon-filter);
}

.subcontainer_semester .semester_drag:hover,
.subcontainer_semester .semester_date_edit:hover,
.subcontainer_semester .delete_semester:hover,
.subcontainer_semester .semester_move:hover:not(:disabled) {
    opacity: 1;
}

/* Course list container - THE KEY FIX */
.subcontainer_semester .semester {
    display: flex;
    flex-direction: column;
    gap: 4px;
    flex: 1; /* Take remaining space in subcontainer */
    overflow-y: auto; /* Enable scrolling */
    overflow-x: hidden;
    min-height: 0; /* Allow shrinking below content size */
    padding-right: 0; /* Space for scrollbar */
}

/* Individual course card - FIXED 3-COLUMN LAYOUT WITH LEFT 2-ROW STRUCTURE */
.course {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    flex-shrink: 0;
}

.course_container {
    display: flex;
    align-items: stretch;
    padding: 8px;
    gap: 8px;
    min-height: 50px;
}

.course.has-requisite-warning {
    border-color: var(--state-warning);
}

.planner-course-warnings {
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding: 7px 8px;
    border-top: 1px solid var(--state-warning);
    background: var(--planner-warning-bg);
}

.planner-requisite-warning {
    color: var(--planner-warning-text);
    font-size: 0.7rem;
    line-height: 1.35;
    font-weight: 600;
}

/* LEFT COLUMN - course_label with 2 rows */
.course_label {
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    gap: 4px;
    min-width: 50px;
    max-width: 70px;
}

/* Top row in left column - course code */
.course_label div:first-child {
    font-weight: 600;
    color: var(--primary);
    font-size: 0.875rem;
    white-space: nowrap;
}

/* Bottom row in left column - delete button */
.course_label .course_actions {
    display: flex;
    gap: 6px;
    align-items: center;
    align-self: flex-start;
}

.course_label .course_actions button {
    width: 18px;
    height: 18px;
    border: none;
    background: transparent;
    cursor: pointer;
    opacity: 0.55;
    transition: opacity 0.15s ease;
    padding: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.course_label .course_actions button:hover {
    opacity: 1;
}

.course_label .course_actions .delete_course {
    background: var(--icon-course-delete) center/contain no-repeat;
    filter: brightness(var(--brightness-rate));
}

.course_label .course_actions .delete_course:hover,
.input_container .delete_add_course:hover {
    background-image: var(--icon-delete-hover);
    filter: var(--icon-delete-hover-filter);
}

.course_label .course_actions .details_course {
    color: var(--text-secondary);
}

.course_label .course_actions .course_drag {
    color: var(--text-secondary);
    cursor: grab;
}

.course_label .course_actions .course_drag:active {
    cursor: grabbing;
}

.course-move-destinations {
    display: grid;
    gap: 8px;
    margin-top: 12px;
}

.course-move-destination {
    width: 100%;
    justify-content: flex-start;
}

.course.course-dragging,
.container_semester.semester-dragging {
    opacity: 0.45;
}

.container_semester.course-drop-target {
    border-color: var(--primary);
    box-shadow: 0 0 0 2px color-mix(in srgb, var(--primary) 28%, transparent), var(--shadow-sm);
}

.course-drop-placeholder {
    min-height: 50px;
    flex: 0 0 50px;
    border: 2px dashed var(--primary);
    border-radius: var(--radius-sm);
    background: color-mix(in srgb, var(--primary) 10%, transparent);
    pointer-events: none;
}

body:not(.is-mobile) .semester-drop-placeholder {
    box-sizing: border-box;
    flex: 0 0 var(--semester-width);
    width: var(--semester-width);
    height: 95%;
    margin: 16px 8px;
    border: 2px dashed var(--primary);
    border-radius: var(--radius-md);
    background: color-mix(in srgb, var(--primary) 10%, var(--bg-card));
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    text-align: center;
    cursor: grabbing;
    box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--primary) 14%, transparent);
}

.semester-drop-placeholder-label {
    max-width: 100%;
    padding: 8px 12px;
    border-radius: var(--radius-md);
    background: color-mix(in srgb, var(--bg-card) 84%, transparent);
    font-size: 0.875rem;
    font-weight: 700;
    line-height: 1.35;
}

body.is-mobile .semester-drop-placeholder {
    display: none !important;
}

.container_semester.semester-drop-target {
    position: relative;
}

.container_semester.semester-drop-target::before,
.container_semester.semester-drop-target::after {
    content: '';
    position: absolute;
    top: 4%;
    bottom: 4%;
    width: 4px;
    border-radius: 4px;
    background: var(--primary);
    box-shadow: 0 0 0 3px color-mix(in srgb, var(--primary) 20%, transparent);
    z-index: 5;
    pointer-events: none;
}

.container_semester.semester-drop-target::before {
    display: none;
    left: -6px;
}

.container_semester.semester-drop-target::after {
    display: none;
    right: -6px;
}

.container_semester.semester-drop-target[data-semester-drop-edge="before"]::before,
.container_semester.semester-drop-target[data-semester-drop-edge="after"]::after {
    display: block;
}

.course_label .course_actions .details_course i {
    font-size: 0.95rem;
    pointer-events: none;
}

.course_label .course_actions .details_course:hover {
    color: var(--text-primary);
}
/* MIDDLE COLUMN - Course info */
.course_info {
    display: flex;
    flex-direction: column;
    gap: 2px;
    flex: 1;
    color: var(--text-primary);
    font-size: 0.75rem;
    align-self: flex-start;
}

.course_info .course_name {
    font-weight: 600;
}

.course_info .course_type {
    text-transform: uppercase;
    color: var(--text-secondary);
    font-size: 0.675rem;
}

.course_info .course_type.is-overflow-type {
    color: var(--tone-warning-500);
    font-weight: 700;
}

.course_info .course_type .course_type_part.is-overflow-type {
    color: var(--tone-warning-500);
    font-weight: 700;
}

/* Course details modal content */
.muted {
    color: var(--text-secondary);
}

.course-details-modal {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.course-details-modal > * {
    width: 100%;
}

.course-details-modal p {
    margin-bottom: 0;
}

.course-details-meta {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 6px 12px;
    padding: 10px;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    background: var(--bg-surface);
    margin: 10px 0 12px;
}

.course-details-modal .course-details-meta {
    margin: 0;
}

.course-details-section p {
    margin: 0;
}

.course-details-section h4 {
    margin: 0 0 6px 0;
    font-size: 0.85rem;
    color: var(--text-primary);
}

.course-registration-guidance {
    padding: 10px;
    border: 1px solid var(--state-warning);
    border-radius: var(--radius-md);
    background: var(--planner-warning-bg);
}

.course-registration-guidance-heading,
.scheduler-registration-guidance-heading {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    margin-bottom: 6px;
}

.course-registration-guidance-heading h4,
.scheduler-registration-guidance-heading .scheduler-details-subtitle {
    margin-bottom: 0;
}

.course-registration-state {
    display: inline-flex;
    align-items: center;
    flex: 0 0 auto;
    min-height: 20px;
    padding: 2px 7px;
    border-radius: 999px;
    background: var(--bg-surface);
    color: var(--planner-warning-text);
    font-size: 0.68rem;
    font-weight: 700;
}

.course-registration-state.is-met {
    color: var(--accent);
}

.course-registration-state.is-unmet {
    color: var(--tone-danger-500);
}

.course-registration-source,
.course-registration-advisory {
    margin-top: 7px !important;
    color: var(--text-secondary);
    font-size: 0.75rem;
    line-height: 1.35;
}

.course-registration-source a {
    color: var(--accent);
}

.course-details-list {
    margin: 0;
    padding-left: 18px;
}

.course-details-actions {
    display: flex;
    justify-content: flex-end;
    margin-top: 12px;
}

.course-history-table-wrap {
    overflow-x: auto;
    width: 100%;
    display: block;
}

.course-history-disclosure-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.course-history-disclosure {
    border: 1px solid var(--border);
    background: var(--bg-card);
}

.course-history-disclosure-summary {
    cursor: pointer;
    padding: 8px 10px;
    font-weight: 700;
    color: var(--text-primary);
    background: var(--bg-surface);
}

.course-history-disclosure .course-history-table {
    max-width: none;
    margin: 0;
    border-left: none;
    border-right: none;
    border-bottom: none;
}

.course-history-table {
    width: 100%;
    max-width: 680px;
    min-width: 0;
    margin: 0 auto;
    font-size: 0.88rem;
    border: 1px solid var(--border-hover);
    background: var(--bg-card);
    box-sizing: border-box;
    overflow: hidden;
}

.course-history-row {
    display: grid;
    grid-template-columns: minmax(140px, 180px) minmax(0, 1fr);
}

.course-history-table--sections .course-history-row {
    grid-template-columns: minmax(96px, 132px) minmax(0, 1fr) minmax(84px, 104px);
}

.course-history-table--sections .course-history-row--group {
    grid-template-columns: minmax(96px, 132px) minmax(0, 1fr);
}

.course-history-row:not(:last-child) {
    border-bottom: 1px solid var(--border-hover);
}

.course-history-row--head {
    background: var(--bg-surface);
    font-weight: 700;
}

.course-history-cell {
    padding: 8px 10px;
    text-align: left;
    border-right: 1px solid var(--border-hover);
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
}

.course-history-cell:last-child {
    border-right: none;
}

.course-history-cell--term {
    align-items: center;
    justify-content: center;
    text-align: center;
}

.course-history-cell--number {
    align-items: center;
    justify-content: center;
    text-align: center;
    justify-self: stretch;
    display: grid;
    place-items: center;
    padding-left: 4px;
    padding-right: 4px;
}

.course-history-section-rows {
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.course-history-section-row {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(84px, 104px);
    align-items: stretch;
}

.course-history-section-row:not(:last-child) {
    border-bottom: 1px solid var(--border-hover);
}

.course-history-section-label {
    font-weight: 700;
    color: var(--text-primary);
}

.course-history-instructor-line {
    color: var(--text-secondary);
}

.course-history-cell > div + div {
    margin-top: 4px;
}

@media (max-width: 520px) {
    .course-details-meta {
        grid-template-columns: 1fr;
    }
}