:root {
    --bg-dark: #121212;
    --bg-card: #1e1e1e;
    --bg-input: #2c2c2c;
    --border-color: #404040;
    --text-primary: #e0e0e0;
    --text-secondary: #a0a0a0;
    --accent-color: #3b82f6;
    /* Blue like in screenshot */
    --accent-hover: #2563eb;
    --danger-color: #ef4444;
    --danger-bg: rgba(239, 68, 68, 0.1);

    /* Warning Color */
    --warning-color: #f59e0b;
    --warning-bg: rgba(245, 158, 11, 0.1);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Inter', sans-serif;
}

body {
    background-color: var(--bg-dark);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header */
header {
    background-color: var(--bg-dark);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 2rem;
    position: sticky;
    top: 0;
    z-index: 100;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.header-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo-area h1 {
    font-size: 1.5rem;
    font-weight: 600;
    margin: 0;
}

.management-group {
    display: flex;
    gap: 0.5rem;
}

.header-filters {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
    width: 100%;
}

.header-actions {
    display: flex;
    justify-content: flex-end;
    align-items: center;
    width: 100%;
}

.filter-group,
.action-group {
    display: flex;
    gap: 0.5rem;
    align-items: center;
    flex-wrap: wrap;
}

/* Inputs & Selects */
select,
input {
    background-color: var(--bg-input);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.35rem 0.5rem;
    border-radius: 4px;
    font-size: 0.85rem;
    outline: none;
    transition: all 0.2s;
}

select:focus,
input:focus {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.2);
}

select option {
    background-color: var(--bg-input);
    color: var(--text-primary);
}

/* Highlight Empty Inputs */
.input-empty {
    border-color: var(--warning-color) !important;
    background-color: var(--warning-bg) !important;
}

/* Buttons */
.btn {
    padding: 0.35rem 0.8rem;
    border-radius: 4px;
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    border: 1px solid transparent;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.2s;
}

.btn-outline {
    background-color: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}

.btn-outline:hover {
    background-color: var(--bg-input);
    border-color: var(--text-secondary);
}

.btn-primary {
    background-color: var(--accent-color);
    color: white;
}

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

.btn-danger {
    background-color: var(--danger-bg);
    color: var(--danger-color);
    border: 1px solid var(--danger-color);
}

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

.icon-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 1.1rem;
    padding: 0.5rem;
    border-radius: 4px;
}

.icon-btn:hover {
    color: var(--text-primary);
    background-color: rgba(255, 255, 255, 0.05);
}

/* Main Content */
main {
    padding: 2rem;
    flex: 1;
    overflow-y: auto;
}

#course-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    width: 90%;
    margin: 0 auto;
}

/* Course Card */
.course-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1rem;
    position: relative;
    transition: transform 0.2s;
}

/* .course-card:hover { border-color: var(--text-secondary); } */

.card-header-row {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 3fr 2fr 1fr 2fr auto;
    gap: 0.5rem;
    align-items: start;
    margin-bottom: 0.5rem;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
}

.input-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.input-full {
    width: 100%;
}

/* Exam Section within Card */
.exams-container {
    background-color: rgba(0, 0, 0, 0.2);
    border-radius: 8px;
    padding: 0.5rem;
    margin-top: 0.5rem;
}

.exam-row {
    display: grid;
    grid-template-columns: 2fr 1.3fr 1.7fr 2fr 2fr 2fr auto;
    gap: 0.5rem;
    align-items: center;
    padding: 0.4rem 0;
    border-bottom: 1px solid var(--border-color);
}

.exam-row:last-child {
    border-bottom: none;
}

.add-exam-btn-row {
    display: flex;
    justify-content: center;
    margin-top: 1rem;
}

.add-exam-btn-row button {
    color: var(--text-secondary);
}

.add-exam-btn-row button:hover {
    color: var(--text-primary);
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-dark);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

/* Modal Styles */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.7);
    /* Darker backdrop */
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.2s, visibility 0.2s;
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    width: 900px;
    max-width: 95%;
    max-height: 80vh;
    display: flex;
    flex-direction: column;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.5);
}

.modal-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h2 {
    font-size: 1.25rem;
    font-weight: 600;
}

.modal-body {
    padding: 1.5rem;
    overflow-y: auto;
    flex: 1;
}

.management-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-top: 1rem;
}

.management-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: var(--bg-input);
    padding: 0.5rem 1rem;
    border-radius: 6px;
    border: 1px solid var(--border-color);
}

.management-input-row {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.close-modal {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 1.5rem;
    cursor: pointer;
}

/* Tabbed Modal Styles */
.tab-header {
    display: flex;
    border-bottom: 1px solid var(--border-color);
    background-color: var(--bg-card);
}

.tab-btn {
    flex: 1;
    padding: 1rem;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-weight: 500;
    cursor: pointer;
    border-bottom: 2px solid transparent;
    transition: all 0.2s;
    text-align: center;
    font-size: 1rem;
}

.tab-btn:hover {
    background-color: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
}

.tab-btn.active {
    color: var(--accent-color);
    border-bottom-color: var(--accent-color);
    background-color: rgba(59, 130, 246, 0.05);
}

.tab-content-container {
    flex: 1;
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.tab-pane {
    display: none;
    flex-direction: column;
    height: 100%;
    flex: 1;
    padding: 1rem;
}

.tab-pane.active {
    display: flex;
}

.mobile-menu-toggle {
    display: none;
    font-size: 1.5rem;
    background: none;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
}

/* Mobile Labels hidden on desktop */
/* Mobile Labels hidden on desktop */
.mobile-label {
    display: none;
}

.exam-input-group {
    display: block;
}

/* Mobile Responsiveness */
@media (max-width: 768px) {
    body {
        font-size: 14px;
        padding-top: 0;
    }

    /* Header Stack */
    header {
        padding: 1rem;
        gap: 1rem;
        position: relative;
        height: auto;
    }

    /* Adjust Top Row */
    .header-top {
        display: flex;
        justify-content: space-between;
        align-items: center;
        width: 100%;
        flex-wrap: wrap;
    }

    .logo-area {
        flex: 1;
    }

    .mobile-menu-toggle {
        display: block !important;
        margin-left: 1rem;
    }

    .header-actions {
        justify-content: flex-start !important;
    }

    .logo-area h1 {
        text-align: left;
        font-size: 1.2rem;
    }

    .management-group {
        display: none;
    }

    /* Expanded Menu */
    .header-filters,
    .header-actions {
        display: none;
        flex-direction: column;
        align-items: stretch;
        gap: 1rem;
        width: 100%;
        background: var(--bg-card);
        padding: 1rem;
        border-radius: 8px;
        border: 1px solid var(--border-color);
    }

    header.expanded .header-filters,
    header.expanded .header-actions {
        display: flex;
    }

    header.expanded .management-group {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 0.5rem;
        width: 100%;
        margin-top: 1rem;
    }

    header.expanded .management-group .btn {
        justify-content: center;
        width: 100%;
        font-size: 0.85rem;
        padding: 0.6rem;
    }

    header.expanded .management-group .conflict-display {
        grid-column: span 2;
        text-align: center;
        margin-right: 0 !important;
        font-size: 0.9rem;
    }

    /* Filter Groups - Make them grid */
    .filter-group,
    .action-group {
        display: grid !important;
        grid-template-columns: 1fr 1fr;
        gap: 0.5rem;
        width: 100%;
        align-items: stretch;
    }

    .filter-item {
        width: 100%;
        display: flex;
        align-items: center;
        gap: 0.2rem;
    }

    .filter-item select {
        width: 100%;
        flex: 1;
        font-size: 0.85rem;
        padding: 0.5rem;
    }

    .filter-item i {
        display: none;
    }

    .action-group .btn {
        justify-content: center;
        width: 100%;
        font-size: 0.9rem;
        padding: 0.6rem;
    }

    /* Course Cards */
    #course-list {
        width: 100%;
    }

    .card-header-row {
        display: flex;
        flex-direction: column;
        gap: 1rem;
    }

    /* Exam Rows */
    .exams-container {
        padding: 0;
        background: transparent;
    }

    /* Hide Desktop Header Labels on Mobile */
    .exams-container .input-label[style*="grid"] {
        display: none !important;
    }

    .exam-row {
        display: flex;
        flex-direction: column;
        border: 1px solid var(--border-color);
        background: rgba(255, 255, 255, 0.05);
        padding: 1rem;
        border-radius: 8px;
        margin-bottom: 1rem;
        align-items: stretch;
        gap: 0.2rem;
    }

    .exam-row:last-child {
        border-bottom: 1px solid var(--border-color);
    }

    /* Mobile Labels inside Exam Row */
    .mobile-label {
        display: inline-block;
        width: 70px;
        /* Fixed width for alignment */
        min-width: 70px;
        font-weight: 500;
        color: var(--text-secondary);
        font-size: 0.9rem;
    }

    .exam-input-group {
        display: flex;
        align-items: center;
        gap: 0.5rem;
        width: 100%;
        margin-bottom: 0.5rem;
    }

    /* Inputs larger for touch */
    select,
    input,
    .btn {
        padding: 0.8rem;
        font-size: 1rem;
    }

    /* Force inputs in exam row to take remaining width */
    .exam-input-group select,
    .exam-input-group input {
        padding: 0.5rem !important;
        /* Reduced padding */
        font-size: 0.95rem;
        flex: 1;
    }

    /* Modals Full Screen */
    .modal-content {
        width: 95% !important;
        max-width: 95% !important;
        height: 95vh;
        border-radius: 8px;
        margin: 0;
    }

    .modal-body {
        padding: 1rem;
    }

    #global-login-overlay h1 {
        font-size: 1.8rem !important;
    }

    div[style*="width: 1px; height: 24px;"] {
        display: none;
    }
}



/* Uniform Filter Width */
.header-filters .filter-item select {
    width: 180px;
    /* Approximate width of 'Tüm Sorumlular' */
    box-sizing: border-box;
}

/* Ensure reset button aligns nicely */
.header-filters .icon-btn {
    background-color: var(--bg-secondary);
    color: var(--text-secondary);
    border-radius: 4px;
    transition: all 0.2s;
}

.header-filters .icon-btn:hover {
    background-color: var(--danger-color);
    color: white;
    border-color: var(--danger-color) !important;
}

/* Enforce fixed width and prevent expansion */
.header-filters .filter-item select {
    width: 180px !important;
    min-width: 180px !important;
    max-width: 180px !important;
    text-overflow: ellipsis;
    white-space: nowrap;
    overflow: hidden;
}

.header-filters .filter-item select {
    width: 140px !important;
    min-width: 140px !important;
    max-width: 140px !important;
}