/* Material Design 3 Implementation */
/* Color Variables */
:root {
    /* Material Design 3 Dynamic Colors */
    --md-primary: #6750A4;
    --md-on-primary: #FFFFFF;
    --md-primary-container: #EADDFF;
    --md-on-primary-container: #21005D;
    
    --md-secondary: #625B71;
    --md-on-secondary: #FFFFFF;
    --md-secondary-container: #E8DEF8;
    --md-on-secondary-container: #1D192B;
    
    --md-tertiary: #7D5260;
    --md-on-tertiary: #FFFFFF;
    --md-tertiary-container: #FFD8E4;
    --md-on-tertiary-container: #31111D;
    
    /* Surface Colors */
    --md-surface: #FFFBFE;
    --md-on-surface: #1C1B1F;
    --md-surface-variant: #E7E0EC;
    --md-on-surface-variant: #49454F;
    
    /* Background Colors */
    --md-background: #FFFBFE;
    --md-on-background: #1C1B1F;
    
    /* Error Colors */
    --md-error: #BA1A1A;
    --md-on-error: #FFFFFF;
    --md-error-container: #FFDAD6;
    --md-on-error-container: #410002;
    
    /* Success Colors */
    --md-success: #00A67E;
    --md-on-success: #FFFFFF;
    --md-success-container: #CCF7E5;
    --md-on-success-container: #002114;
    
    /* Warning Colors */
    --md-warning: #FFB81C;
    --md-on-warning: #1C1B1F;
    --md-warning-container: #FFF3CD;
    --md-on-warning-container: #3D2F00;
    
    /* Outline Colors */
    --md-outline: #79747E;
    --md-outline-variant: #CAC4D0;
    
    /* Elevation */
    --md-elevation-1: 0px 1px 3px 1px rgba(0, 0, 0, 0.15), 0px 1px 2px 0px rgba(0, 0, 0, 0.30);
    --md-elevation-2: 0px 2px 6px 2px rgba(0, 0, 0, 0.15), 0px 1px 2px 0px rgba(0, 0, 0, 0.30);
    --md-elevation-3: 0px 4px 8px 3px rgba(0, 0, 0, 0.15), 0px 1px 3px 0px rgba(0, 0, 0, 0.30);
    --md-elevation-4: 0px 6px 10px 4px rgba(0, 0, 0, 0.15), 0px 2px 4px 0px rgba(0, 0, 0, 0.30);
    --md-elevation-5: 0px 8px 12px 6px rgba(0, 0, 0, 0.15), 0px 4px 4px 0px rgba(0, 0, 0, 0.30);
    
    /* State Layers */
    --md-state-hover: rgba(103, 80, 164, 0.08);
    --md-state-focus: rgba(103, 80, 164, 0.12);
    --md-state-pressed: rgba(103, 80, 164, 0.12);
    --md-state-dragged: rgba(103, 80, 164, 0.16);
    
    /* Typography Scale */
    --md-display-large: 3.5rem;
    --md-display-medium: 2.8rem;
    --md-display-small: 2.25rem;
    --md-headline-large: 2rem;
    --md-headline-medium: 1.75rem;
    --md-headline-small: 1.5rem;
    --md-title-large: 1.375rem;
    --md-title-medium: 1rem;
    --md-title-small: 0.875rem;
    --md-body-large: 1rem;
    --md-body-medium: 0.875rem;
    --md-body-small: 0.75rem;
    --md-label-large: 0.875rem;
    --md-label-medium: 0.75rem;
    --md-label-small: 0.6875rem;
    
    /* Shape */
    --md-shape-extra-small: 4px;
    --md-shape-small: 8px;
    --md-shape-medium: 12px;
    --md-shape-large: 16px;
    --md-shape-extra-large: 28px;
    
    /* Motion */
    --md-duration-short1: 50ms;
    --md-duration-short2: 100ms;
    --md-duration-short3: 150ms;
    --md-duration-short4: 200ms;
    --md-duration-medium1: 250ms;
    --md-duration-medium2: 300ms;
    --md-duration-medium3: 350ms;
    --md-duration-medium4: 400ms;
    --md-duration-long1: 500ms;
    --md-duration-long2: 700ms;
    --md-duration-long3: 1000ms;
    --md-duration-long4: 2000ms;
    --md-duration-extra-long1: 3000ms;
    --md-duration-extra-long2: 5000ms;
}

/* Material Design 3 Typography and General Styles */
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    margin: 0;
    padding: 0;
    background: var(--md-background);
    min-height: 100vh;
    color: var(--md-on-background);
    font-weight: 400;
    font-size: var(--md-body-large);
    line-height: 1.5;
    letter-spacing: 0.15px;
}

/* Material Design 3 Header Styles */
header {
    background: var(--md-surface);
    color: var(--md-on-surface);
    padding: 1rem 0;
    box-shadow: var(--md-elevation-1);
    border-bottom: 1px solid var(--md-outline-variant);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
    background: rgba(255, 251, 254, 0.95);
}

/* Enhanced Header Content */
.header-content {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.app-brand {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.brand-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    background: var(--md-primary-container);
    color: var(--md-on-primary-container);
    border-radius: var(--md-shape-large);
    box-shadow: var(--md-elevation-1);
    transition: all var(--md-duration-medium2) cubic-bezier(0.4, 0.0, 0.2, 1);
}

.brand-icon:hover {
    box-shadow: var(--md-elevation-2);
    transform: scale(1.05);
}

.brand-text {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.app-title {
    font-size: var(--md-headline-medium);
    font-weight: 600;
    color: var(--md-on-surface);
    margin: 0;
    letter-spacing: -0.25px;
    line-height: 1.2;
    background: linear-gradient(135deg, var(--md-primary) 0%, var(--md-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.app-subtitle {
    font-size: var(--md-body-medium);
    color: var(--md-on-surface-variant);
    margin: 0;
    font-weight: 400;
    letter-spacing: 0.15px;
    line-height: 1.4;
}

.app-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.prd-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: var(--md-surface-variant);
    color: var(--md-on-surface-variant);
    border-radius: var(--md-shape-large);
    text-decoration: none;
    font-size: var(--md-label-medium);
    font-weight: 500;
    letter-spacing: 0.1px;
    transition: all var(--md-duration-medium2) cubic-bezier(0.4, 0.0, 0.2, 1);
    border: 1px solid var(--md-outline-variant);
    box-shadow: var(--md-elevation-1);
}

.prd-link:hover {
    background: var(--md-surface-variant);
    color: var(--md-on-surface);
    box-shadow: var(--md-elevation-2);
    transform: translateY(-1px);
    text-decoration: none;
}

.prd-icon {
    font-size: 1rem;
}

.prd-text {
    font-size: var(--md-label-medium);
}

/* Responsive Header */
@media (max-width: 768px) {
    .app-brand {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.75rem;
    }
    
    .brand-icon {
        width: 40px;
        height: 40px;
    }
    
    .app-title {
        font-size: var(--md-headline-small);
    }
    
    .app-subtitle {
        font-size: var(--md-body-small);
    }
    
    .app-actions {
        margin-top: 0.5rem;
    }
    
    .prd-link {
        padding: 0.375rem 0.75rem;
        font-size: var(--md-label-small);
    }
}

@media (max-width: 480px) {
    .header-content {
        gap: 0.5rem;
    }
    
    .app-title {
        font-size: var(--md-title-large);
    }
    
    .app-subtitle {
        font-size: var(--md-body-small);
    }
}

/* Legacy header styles for backward compatibility */
header h1 {
    font-size: var(--md-headline-small);
    margin: 0;
    color: var(--md-on-surface);
    font-weight: 500;
    letter-spacing: 0.1px;
}

header .text-muted {
    color: var(--md-on-surface-variant) !important;
    font-size: var(--md-body-medium);
    letter-spacing: 0.25px;
}

header .btn-primary {
    background: var(--md-primary);
    border-color: var(--md-primary);
    color: var(--md-on-primary);
    font-weight: 500;
    font-size: var(--md-label-large);
    letter-spacing: 0.1px;
    text-transform: none;
    border-radius: var(--md-shape-large);
    padding: 0.75rem 1.5rem;
    transition: all var(--md-duration-medium2) cubic-bezier(0.4, 0.0, 0.2, 1);
    box-shadow: var(--md-elevation-1);
}

header .btn-primary:hover {
    background: var(--md-primary);
    box-shadow: var(--md-elevation-2);
    transform: translateY(-1px);
}

/* Header button group */
.btn-group-header {
    flex-wrap: nowrap;
    align-items: center;
}

.btn-group-header button {
    white-space: nowrap;
    font-size: 0.875rem;
}

/* Responsive header buttons */
@media (max-width: 768px) {
    .btn-group-header {
        flex-direction: column;
        gap: 0.5rem !important;
    }
    
    .btn-group-header button {
        width: 100%;
        justify-content: center;
    }
}

/* Main content styles */
main {
    padding: 2rem 1.5rem;
}

/* Material Design 3 Form Styles */
form {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    align-items: center;
}

input[type="text"] {
    flex: 1;
    padding: 1rem 1.25rem;
    border: 1px solid var(--md-outline);
    border-radius: var(--md-shape-large);
    font-size: var(--md-body-large);
    background: var(--md-surface);
    transition: all var(--md-duration-medium2) cubic-bezier(0.4, 0.0, 0.2, 1);
    box-shadow: var(--md-elevation-1);
    font-family: inherit;
    font-weight: 400;
    color: var(--md-on-surface);
    letter-spacing: 0.15px;
    position: relative;
}

input[type="text"]:focus {
    border-color: var(--md-primary);
    outline: none;
    box-shadow: var(--md-elevation-2), 0 0 0 1px var(--md-primary);
    background: var(--md-surface);
}

input[type="text"]:hover {
    border-color: var(--md-outline-variant);
    box-shadow: var(--md-elevation-2);
}

input[type="text"]::placeholder {
    color: var(--md-on-surface-variant);
    font-weight: 400;
    letter-spacing: 0.15px;
}

/* Material Design 3 Button Styles */
button {
    padding: 0.75rem 1.5rem;
    background: var(--md-primary);
    color: var(--md-on-primary);
    border: none;
    border-radius: var(--md-shape-large);
    cursor: pointer;
    font-weight: 500;
    font-size: var(--md-label-large);
    transition: all var(--md-duration-medium2) cubic-bezier(0.4, 0.0, 0.2, 1);
    box-shadow: var(--md-elevation-1);
    position: relative;
    overflow: hidden;
    font-family: inherit;
    letter-spacing: 0.1px;
    text-transform: none;
    min-height: 40px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

button::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--md-state-hover);
    opacity: 0;
    transition: opacity var(--md-duration-short2) cubic-bezier(0.4, 0.0, 0.2, 1);
}

button:hover::before {
    opacity: 1;
}

button:hover {
    background: var(--md-primary);
    box-shadow: var(--md-elevation-2);
    transform: translateY(-1px);
}

button:active {
    transform: translateY(0);
    background: var(--md-primary);
    box-shadow: var(--md-elevation-1);
}

button:focus {
    outline: none;
    box-shadow: var(--md-elevation-2), 0 0 0 2px var(--md-primary);
}

/* Material Design 3 Button Variants */
.btn-secondary {
    background: var(--md-secondary);
    color: var(--md-on-secondary);
}

.btn-secondary:hover {
    background: var(--md-secondary);
    box-shadow: var(--md-elevation-2);
}

.btn-success {
    background: var(--md-success);
    color: var(--md-on-success);
}

.btn-success:hover {
    background: var(--md-success);
    box-shadow: var(--md-elevation-2);
}

.btn-warning {
    background: var(--md-warning);
    color: var(--md-on-warning);
}

.btn-warning:hover {
    background: var(--md-warning);
    box-shadow: var(--md-elevation-2);
}

.btn-danger {
    background: var(--md-error);
    color: var(--md-on-error);
}

.btn-danger:hover {
    background: var(--md-error);
    box-shadow: var(--md-elevation-2);
}

/* Backlog Board Container */
.backlog-board {
    display: flex;
    gap: 2rem;
    min-height: 70vh;
    overflow-x: auto;
    padding: 2rem 0;
    margin: 0 2rem;
}

/* Material Design 3 Board Columns */
.board-column {
    flex: 1;
    min-width: 320px;
    background: var(--md-surface-variant);
    border-radius: var(--md-shape-large);
    display: flex;
    flex-direction: column;
    border: 1px solid var(--md-outline-variant);
    box-shadow: var(--md-elevation-1);
    transition: all var(--md-duration-medium2) cubic-bezier(0.4, 0.0, 0.2, 1);
}

.board-column:hover {
    box-shadow: var(--md-elevation-2);
    border-color: var(--md-outline);
}

.column-header {
    padding: 1.5rem 1.5rem 1rem 1.5rem;
    border-radius: var(--md-shape-large) var(--md-shape-large) 0 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 500;
    background: var(--md-surface);
    border-bottom: 1px solid var(--md-outline-variant);
    position: relative;
}

.column-header::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: var(--md-outline-variant);
}

.column-header h3 {
    margin: 0;
    font-size: var(--md-title-medium);
    font-weight: 500;
    color: var(--md-on-surface);
    letter-spacing: 0.15px;
}

.task-count {
    background: var(--md-primary-container);
    color: var(--md-on-primary-container);
    padding: 0.25rem 0.75rem;
    border-radius: var(--md-shape-extra-large);
    font-size: var(--md-label-medium);
    font-weight: 500;
    min-width: 28px;
    text-align: center;
    letter-spacing: 0.1px;
    box-shadow: var(--md-elevation-1);
}

.column-content {
    flex: 1;
    padding: 1.5rem;
    min-height: 400px;
    overflow-y: auto;
    background: var(--md-surface-variant);
    border-radius: 0 0 var(--md-shape-large) var(--md-shape-large);
}

/* Material Design 3 Task Cards */
.task-card {
    background: var(--md-surface);
    border-radius: var(--md-shape-medium);
    padding: 1rem;
    margin-bottom: 0.75rem;
    box-shadow: var(--md-elevation-1);
    cursor: grab;
    transition: all var(--md-duration-medium2) cubic-bezier(0.4, 0.0, 0.2, 1);
    border: 1px solid var(--md-outline-variant);
    position: relative;
    overflow: hidden;
    /* iOS Touch Support */
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
    -webkit-touch-callout: none;
    -webkit-tap-highlight-color: transparent;
}

.task-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--md-state-hover);
    opacity: 0;
    transition: opacity var(--md-duration-short2) cubic-bezier(0.4, 0.0, 0.2, 1);
    pointer-events: none;
}

.task-card:hover::before {
    opacity: 1;
}

.task-card:hover {
    box-shadow: var(--md-elevation-2);
    transform: translateY(-2px);
    border-color: var(--md-outline);
}

.task-card.dragging {
    opacity: 0.9;
    cursor: grabbing;
    transform: rotate(2deg) scale(1.02);
    box-shadow: var(--md-elevation-4);
    z-index: 1000;
}

.task-card:focus {
    outline: none;
    box-shadow: var(--md-elevation-2), 0 0 0 2px var(--md-primary);
}

.task-content {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    position: relative;
    z-index: 1;
}

.task-text {
    font-size: var(--md-body-medium);
    font-weight: 500;
    color: var(--md-on-surface);
    line-height: 1.4;
    word-wrap: break-word;
    margin-bottom: 0.5rem;
    letter-spacing: 0.15px;
}

.task-id {
    font-size: var(--md-label-small);
    color: var(--md-on-surface-variant);
    font-weight: 400;
    margin-bottom: 0.25rem;
    letter-spacing: 0.4px;
}

.task-description {
    font-size: var(--md-body-small);
    color: var(--md-on-surface-variant);
    line-height: 1.4;
    margin-bottom: 0.5rem;
    letter-spacing: 0.25px;
}

.task-meta {
    font-size: var(--md-label-small);
    color: var(--md-on-surface-variant);
    margin-top: 0.5rem;
    letter-spacing: 0.4px;
}

.task-date {
    font-size: var(--md-label-small);
    color: var(--md-on-surface-variant);
    font-weight: 400;
    letter-spacing: 0.4px;
}

.task-actions {
    display: flex;
    gap: 0.5rem;
    margin-top: 0.75rem;
    flex-wrap: wrap;
    position: relative;
    z-index: 1;
}

.task-actions button {
    padding: 0.375rem 0.75rem;
    font-size: var(--md-label-small);
    border-radius: var(--md-shape-small);
    border: 1px solid var(--md-outline);
    cursor: pointer;
    transition: all var(--md-duration-short2) cubic-bezier(0.4, 0.0, 0.2, 1);
    font-weight: 500;
    background: var(--md-surface);
    color: var(--md-on-surface-variant);
    letter-spacing: 0.1px;
    min-height: 32px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.task-actions button:hover {
    background: var(--md-surface-variant);
    border-color: var(--md-outline-variant);
    color: var(--md-on-surface);
    box-shadow: var(--md-elevation-1);
}

.task-actions button:focus {
    outline: none;
    box-shadow: var(--md-elevation-1), 0 0 0 2px var(--md-primary);
}

.btn-edit {
    background: var(--md-warning-container);
    color: var(--md-on-warning-container);
    border-color: var(--md-warning);
}

.btn-edit:hover {
    background: var(--md-warning-container);
    color: var(--md-on-warning-container);
    box-shadow: var(--md-elevation-1);
}

.btn-delete {
    background: var(--md-error-container);
    color: var(--md-on-error-container);
    border-color: var(--md-error);
}

.btn-delete:hover {
    background: var(--md-error-container);
    color: var(--md-on-error-container);
    box-shadow: var(--md-elevation-1);
}

.btn-move {
    background: var(--md-primary-container);
    color: var(--md-on-primary-container);
    border-color: var(--md-primary);
}

.btn-move:hover {
    background: var(--md-primary-container);
    color: var(--md-on-primary-container);
    box-shadow: var(--md-elevation-1);
}

.btn-archive {
    background: var(--md-secondary-container);
    color: var(--md-on-secondary-container);
    border-color: var(--md-secondary);
    padding: 0.375rem !important;
    min-width: 32px;
    font-size: 1rem;
}

.btn-archive:hover {
    background: var(--md-secondary-container);
    color: var(--md-on-secondary-container);
    box-shadow: var(--md-elevation-1);
    transform: scale(1.05);
}

/* Settings Form Styling */
.settings-form {
    padding: 1rem 0;
    max-width: 100%;
}

.settings-form .form-label {
    font-weight: 500;
    color: var(--md-on-surface);
    margin-bottom: 0.5rem;
    font-size: 0.95rem;
}

.settings-form .form-control {
    border: 1px solid var(--md-outline);
    border-radius: var(--md-shape-small);
    padding: 0.5rem;
    font-size: 0.9rem;
    background: var(--md-surface);
    color: var(--md-on-surface);
}

.settings-form .form-control:focus {
    border-color: var(--md-primary);
    box-shadow: 0 0 0 2px rgba(103, 80, 164, 0.2);
    outline: none;
}

.settings-form .form-check {
    padding-left: 1.5rem;
}

.settings-form .form-check-input {
    width: 1.1rem;
    height: 1.1rem;
    margin-top: 0.1rem;
    border: 2px solid var(--md-outline);
    border-radius: 0.25rem;
}

.settings-form .form-check-input:checked {
    background-color: var(--md-primary);
    border-color: var(--md-primary);
}

.settings-form .form-check-label {
    font-size: 0.95rem;
    color: var(--md-on-surface);
    line-height: 1.4;
    cursor: pointer;
}

.settings-form .input-group-container {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    max-width: 180px;
}

.settings-form .days-label {
    color: var(--md-on-surface-variant);
    font-size: 0.9rem;
    white-space: nowrap;
}

/* Modal improvements */
.modal-box {
    min-width: 320px;
    max-width: 480px;
}

/* Material Design 3 Drag and Drop States */
.column-content.drag-over {
    background: var(--md-primary-container);
    border: 2px dashed var(--md-primary);
    border-radius: var(--md-shape-large);
    opacity: 0.8;
}

.drop-zone {
    min-height: 50px;
    border: 2px dashed transparent;
    border-radius: var(--md-shape-large);
    transition: all var(--md-duration-medium2) cubic-bezier(0.4, 0.0, 0.2, 1);
}

.drop-zone.drag-over {
    border-color: var(--md-primary);
    background: var(--md-primary-container);
    opacity: 0.6;
}

/* Material Design 3 Footer Styles */
footer {
    font-size: var(--md-body-medium);
    background: var(--md-surface);
    color: var(--md-on-surface-variant);
    padding: 1.5rem 1.25rem;
    text-align: center;
    margin-top: 3rem;
    border-top: 1px solid var(--md-outline-variant);
    letter-spacing: 0.25px;
}

/* Material Design 3 Modal Styles */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(28, 27, 31, 0.32);
    backdrop-filter: blur(8px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    transition: all var(--md-duration-medium2) cubic-bezier(0.4, 0.0, 0.2, 1);
}

.modal-box {
    background: var(--md-surface);
    color: var(--md-on-surface);
    border-radius: var(--md-shape-large);
    box-shadow: var(--md-elevation-4);
    border: 1px solid var(--md-outline-variant);
    transition: all var(--md-duration-medium2) cubic-bezier(0.4, 0.0, 0.2, 1);
    transform: scale(0.9);
    opacity: 0;
    animation: modalEnter var(--md-duration-medium2) cubic-bezier(0.4, 0.0, 0.2, 1) forwards;
}

@keyframes modalEnter {
    to {
        transform: scale(1);
        opacity: 1;
    }
}

.modal-box {
    padding: 2rem;
    border-radius: var(--md-shape-large);
    text-align: center;
    max-width: 420px;
    width: 90%;
    position: relative;
    overflow: hidden;
}

.modal-box h5 {
    color: var(--md-on-surface);
    margin-bottom: 1rem;
    font-weight: 500;
    font-size: var(--md-title-large);
    position: relative;
    z-index: 1;
    letter-spacing: 0.1px;
}

.modal-box p {
    color: var(--md-on-surface-variant);
    margin-bottom: 1.5rem;
    position: relative;
    z-index: 1;
    font-weight: 400;
    line-height: 1.5;
    font-size: var(--md-body-medium);
    letter-spacing: 0.25px;
}

.modal-box input {
    margin-bottom: 1.5rem;
    position: relative;
    z-index: 1;
    width: 100%;
    box-sizing: border-box;
}

.modal-actions {
    margin-top: 1.5rem;
    display: flex;
    justify-content: space-around;
    gap: 1rem;
    position: relative;
    z-index: 1;
}

.modal-actions button {
    flex: 1;
    padding: 0.75rem 1.5rem;
    border-radius: var(--md-shape-large);
    font-size: var(--md-label-large);
    font-weight: 500;
    letter-spacing: 0.1px;
    transition: all var(--md-duration-medium2) cubic-bezier(0.4, 0.0, 0.2, 1);
}

/* Material Design 3 Modal Button Styles */
.modal-actions button:first-child {
    background: var(--md-primary);
    color: var(--md-on-primary);
    box-shadow: var(--md-elevation-1);
}

.modal-actions button:first-child:hover {
    background: var(--md-primary);
    box-shadow: var(--md-elevation-2);
    transform: translateY(-1px);
}

.modal-actions button:last-child {
    background: var(--md-surface-variant);
    color: var(--md-on-surface-variant);
    border: 1px solid var(--md-outline);
    box-shadow: var(--md-elevation-1);
}

.modal-actions button:last-child:hover {
    background: var(--md-surface-variant);
    color: var(--md-on-surface);
    box-shadow: var(--md-elevation-2);
    transform: translateY(-1px);
}

/* Responsive Design */
@media (max-width: 768px) {
    .board-container {
        flex-direction: column;
        gap: 20px;
    }
    
    .board-column {
        min-width: unset;
    }
    
    form {
        flex-direction: column;
        align-items: stretch;
    }
    
    .d-flex.gap-3.mb-4.justify-content-center {
        flex-direction: column;
        align-items: stretch;
    }
    
    header h1 {
        font-size: 2.5rem; /* Smaller on mobile */
    }
    
    header p {
        font-size: 1.125rem;
    }
    
    main {
        padding: 20px 16px;
    }
    
    .task-actions {
        flex-direction: column;
    }
    
    .task-actions button {
        width: 100%;
        margin-bottom: 4px;
    }
}

/* Empty state */
.empty-state {
    text-align: center;
    color: #9CA3AF;
    font-style: italic;
    padding: 48px 24px;
    font-size: 14px;
    font-weight: 300;
}

/* Animation for new tasks */
@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-20px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.task-card.new-task {
    animation: slideIn 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

/* Material Design 3 Scrollbar Styling */
.column-content::-webkit-scrollbar {
    width: 8px;
}

.column-content::-webkit-scrollbar-track {
    background: var(--md-surface-variant);
    border-radius: var(--md-shape-small);
}

.column-content::-webkit-scrollbar-thumb {
    background: var(--md-outline);
    border-radius: var(--md-shape-small);
    border: 2px solid var(--md-surface-variant);
}

.column-content::-webkit-scrollbar-thumb:hover {
    background: var(--md-outline-variant);
}

/* Material Design 3 Import/Export Button Styles */
#import-button {
    background: var(--md-success);
    color: var(--md-on-success);
}

#import-button:hover {
    background: var(--md-success);
    box-shadow: var(--md-elevation-2);
    transform: translateY(-1px);
}

#export-button {
    background: var(--md-warning);
    color: var(--md-on-warning);
}

#export-button:hover {
    background: var(--md-warning);
    box-shadow: var(--md-elevation-2);
    transform: translateY(-1px);
}

/* Material Design 3 Focus States for Accessibility */
button:focus,
input:focus {
    outline: none;
    box-shadow: 0 0 0 2px var(--md-primary);
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --md-primary: #000000;
        --md-on-primary: #FFFFFF;
        --md-outline: #000000;
        --md-on-surface: #000000;
        --md-surface: #FFFFFF;
    }
}

/* Material Design 3 Typography Scale */
h1, h2, h3, h4, h5, h6 {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    color: var(--md-on-surface);
    font-weight: 500;
    letter-spacing: 0.1px;
    line-height: 1.2;
}

h1 { font-size: var(--md-display-small); }
h2 { font-size: var(--md-headline-large); }
h3 { font-size: var(--md-headline-medium); }
h4 { font-size: var(--md-headline-small); }
h5 { font-size: var(--md-title-large); }
h6 { font-size: var(--md-title-medium); }

/* Material Design 3 Link Styles */
a {
    color: var(--md-primary);
    text-decoration: none;
    transition: color var(--md-duration-short2) cubic-bezier(0.4, 0.0, 0.2, 1);
    font-weight: 500;
    letter-spacing: 0.1px;
}

a:hover {
    color: var(--md-primary);
    text-decoration: underline;
    text-underline-offset: 2px;
}

a:focus {
    outline: none;
    box-shadow: 0 0 0 2px var(--md-primary);
    border-radius: var(--md-shape-small);
}

/* Screen reader only styles */
.sr-only {
    position: absolute !important;
    width: 1px !important;
    height: 1px !important;
    padding: 0 !important;
    margin: -1px !important;
    overflow: hidden !important;
    clip: rect(0, 0, 0, 0) !important;
    white-space: nowrap !important;
    border: 0 !important;
}

.sr-only-focusable:focus,
.sr-only-focusable:active {
    position: static !important;
    width: auto !important;
    height: auto !important;
    padding: 0.25rem 0.5rem !important;
    margin: 0 !important;
    overflow: visible !important;
    clip: auto !important;
    white-space: normal !important;
}

/* Accessibility enhancements */
.task-card:focus {
    outline: 2px solid var(--md-primary);
    outline-offset: 2px;
    box-shadow: 0 0 0 4px rgba(103, 80, 164, 0.2);
}

.column-content:focus {
    outline: 2px solid var(--md-primary);
    outline-offset: -2px;
    background-color: rgba(103, 80, 164, 0.05);
}

.keyboard-dragging {
    opacity: 0.7;
    transform: scale(0.95);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.2);
    outline: 3px dashed var(--md-primary) !important;
}

[aria-dropeffect="move"] {
    background-color: rgba(103, 80, 164, 0.1);
    border: 2px dashed var(--md-primary);
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    .task-card {
        border: 2px solid;
    }
    
    .task-card:focus {
        outline-width: 3px;
    }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    .task-card,
    .keyboard-dragging {
        transition: none;
        transform: none;
    }
    
    .task-card.new-task {
        animation: none;
    }
}