:root {
    --primary: #2A623D;
    --primary-hover: #245333;

    /* MWP Theme Palette */
    --mwp-page: #f4f7f4;
    --mwp-surface: #ffffff;
    --mwp-soft: #f6f8f7;
    --mwp-hover: #eaf2ec;
    --mwp-border: #d8e1dc;
    --mwp-divider: #e9eeeb;
    --mwp-muted: #53645b;
    --mwp-accent: #2a623d;
    --mwp-accent-hover: #245333;
    --mwp-canvas: #eef1f3;
    --mwp-shadow: 0 3px 16px rgb(30 58 40 / 5%);

    /* Map to Pico CSS native variables for Dark Mode compatibility */
    --bg-main: var(--mwp-page);
    --bg-sidebar: var(--mwp-surface);
    --border-color: var(--mwp-border);
    --text-main: var(--pico-color);
    --text-muted: var(--mwp-muted);

    /* Pico CSS overrides */
    --pico-primary: var(--primary) !important;
    --pico-primary-hover: var(--primary-hover) !important;
    --pico-primary-background: var(--primary) !important;
    --pico-primary-border: var(--primary) !important;
    --pico-primary-hover-background: var(--primary-hover) !important;
    --pico-primary-hover-border: var(--primary-hover) !important;
    --pico-primary-focus: rgba(42, 98, 61, 0.25) !important;
    --pico-font-size: 92% !important;
    --pico-form-element-spacing-vertical: 0.5rem !important;
}

@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        --mwp-page: #131a17;
        --mwp-surface: #1b2420;
        --mwp-soft: #222e27;
        --mwp-hover: #2b3a31;
        --mwp-border: #46564c;
        --mwp-divider: #303d34;
        --mwp-muted: #b0beb5;
        --mwp-accent: #2a623d;
        --mwp-accent-hover: #245333;
        --mwp-canvas: #151d19;
        --mwp-shadow: 0 3px 16px rgb(0 0 0 / 15%);
    }
}

:root[data-theme="dark"] {
    --mwp-page: #131a17;
    --mwp-surface: #1b2420;
    --mwp-soft: #222e27;
    --mwp-hover: #2b3a31;
    --mwp-border: #46564c;
    --mwp-divider: #303d34;
    --mwp-muted: #b0beb5;
    --mwp-accent: #2a623d;
    --mwp-accent-hover: #245333;
    --mwp-canvas: #151d19;
    --mwp-shadow: 0 3px 16px rgb(0 0 0 / 15%);
}

/* Global resets are now handled by Pico CSS */

body {
    font-family: 'Inter', sans-serif;
    background: var(--bg-main);
    color: var(--text-main);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    /* max-width: 1600px; */
    margin: 0 auto;
}

/* Top Header */
.top-header {
    width: 100%;
    background: var(--mwp-surface);
    border-bottom: 1px solid var(--mwp-divider) !important;
    z-index: 20;
    flex-shrink: 0;
    margin-top: 0;
}

.top-header-container {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: center;
    padding: 0.75rem 1.5rem;
    width: 100%;
    max-width: 1600px;
    margin-inline: auto;
}

.top-header-left {
    display: flex;
    flex-direction: column;
    justify-content: center;
    line-height: 1.1;
}

.brand {
    text-decoration: none !important;
    display: flex;
    align-items: center;
    gap: 0.65rem;
    line-height: 1.1;
}

.brand-icon {
    width: 38px;
    height: 38px;
    flex-shrink: 0;
    display: block;
}

.brand-text {
    display: flex;
    flex-direction: column;
    justify-content: center;
    line-height: 1.1;
}


.top-header-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary);
    margin: 0;
    white-space: nowrap;
}

.top-header-subtitle {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-weight: 500;
    margin: 0 !important;
    white-space: nowrap;
}

.top-header-center {
    display: flex;
    align-items: center;
    background: var(--mwp-soft);
    border: 1px solid var(--mwp-border);
    border-radius: 10px;
    padding: 0.15rem 0.5rem;
    box-shadow: none;
}

.top-header-center nav {
    margin: 0;
    padding: 0;
    width: 100%;
}

.top-header-center nav ul {
    margin: 0;
    padding: 0;
    display: flex;
    list-style: none;
}

.top-header-center nav ul li {
    padding: 0;
    margin: 0;
}

.top-header-center details.dropdown {
    margin: 0;
}

.top-header-center details.dropdown summary {
    background: transparent !important;
    border: none !important;
    box-shadow: none !important;
    color: var(--text-main) !important;
    padding: 0.35rem 0.75rem;
    font-size: 0.85rem;
    font-weight: 500;
    margin: 0;
    /* text-transform: uppercase; */
    line-height: 1.8;
}

.top-header-center details.dropdown summary:hover {
    color: var(--primary) !important;
}

.top-header-center details.dropdown summary::after {
    margin-inline-start: 0.25rem !important;
}

.top-header-center details.dropdown ul,
details.dropdown > ul {
    min-width: 150px;
    z-index: 100;
    /* background-color: var(--mwp-surface); */
    /* border: 1px solid var(--mwp-border); */
    /* border-radius: 10px; */
    /* box-shadow: var(--mwp-shadow); */
}

/* Mega Menu Flyout using Pico .grid */
details.dropdown.mega-menu {
    position: relative;
}

details.dropdown.mega-menu .dropdown-content {
    display: none;
    position: absolute;
    top: calc(100% + 8px);
    left: 50%;
    transform: translateX(-50%);
    width: 650px;
    max-width: 90vw;
    padding: 1.25rem 1.5rem;
    background: var(--mwp-surface);
    border: 1px solid var(--mwp-border);
    border-radius: 10px;
    box-shadow: var(--mwp-shadow);
    z-index: 1000;
}

details.dropdown.mega-menu[open] .dropdown-content {
    display: grid;
}

details.dropdown.mega-menu .dropdown-content strong {
    display: block;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--pico-color);
    margin-bottom: 0.5rem;
    padding-bottom: 0.25rem;
    border-bottom: 1px solid var(--pico-muted-border-color, var(--border-color));
}

details.dropdown.mega-menu .dropdown-content ul {
    display: block;
    margin: 0;
    padding: 0;
    list-style: none;
}

details.dropdown.mega-menu .dropdown-content li {
    display: block !important;
    padding: 0.2rem 0;
    margin: 0;
}

details.dropdown.mega-menu .dropdown-content li a {
    display: block;
    font-size: 0.85rem;
    text-decoration: none;
}

details.dropdown.mega-menu .dropdown-content li.view-all {
    margin-top: 0.75rem;
    padding-top: 0.4rem;
    border-top: 1px solid var(--pico-muted-border-color, var(--border-color));
}

details.dropdown.mega-menu .dropdown-content li.view-all a {
    font-weight: 600;
    color: var(--primary);
}

.top-header-right {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    justify-self: end;
}

.top-header-menu {
    display: flex;
    align-items: center;
    gap: 0.8rem;
}

.hamburger-btn,
.settings-btn {
    display: none;
    padding: 0.25rem;
    width: auto;
    margin: 0;
    border: none;
    background: transparent;
    cursor: pointer;
    color: var(--text-main);
}

.app-container {
    display: flex;
    flex: 1;
    min-height: calc(100vh - 160px);
    padding: 0.5rem 1.5rem 1.5rem;
    gap: 1.25rem;
    width: 100%;
    max-width: 1600px;
    margin-inline: auto;
}

.sidebar {
    width: 100%;
    max-width: 395px;
    min-width: 0;
    background: var(--mwp-surface);
    border: 1px solid var(--mwp-divider);
    border-right: 1px solid var(--mwp-divider) !important;
    border-radius: 14px;
    box-shadow: var(--mwp-shadow) !important;
    display: flex;
    flex-direction: column;
    z-index: 10;
    transition: width 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.sidebar.collapsed {
    width: 0px;
    border: 0 !important;
    box-shadow: none !important;
}

.sidebar.collapsed .sidebar-content {
    display: none;
}

#adobe-dc-view,
#solver-tab-view {
    background: var(--mwp-canvas);
    border: 1px solid var(--mwp-divider);
    border-radius: 10px;
}

.sidebar-content {
    padding: 1.5rem;
    flex: 1;
    overflow-y: auto;
}

.settings-summary {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.form-section {
    margin-bottom: 0;
}

.form-section h2,
.form-section summary {
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    margin-bottom: 1rem;
    font-weight: 600;
}

.form-section summary {
    cursor: pointer;
    list-style: none;
    /* Hide default arrow */
    outline: none;
    transition: color 0.2s;
}

.form-section summary:hover {
    color: var(--text-main);
}

.form-section summary::-webkit-details-marker {
    display: none;
}

.form-row {
    display: flex;
    gap: 1rem;
}

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

label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
}

input[type="number"],
select,
#sheet-seed {
    margin-bottom: 0px;
    /* Let form-group handle spacing */
    font-family: inherit;
    background-color: var(--mwp-soft);
    border-color: var(--mwp-border);
    border-radius: 8px;
    box-shadow: none;
}

select:hover,
#sheet-seed:hover {
    border-color: var(--mwp-muted);
}

input[role="switch"] {
    background-color: #84938a;
    border-color: #84938a;
    --pico-switch-color: #ffffff;
}

input[role="switch"]:checked {
    background-color: var(--mwp-accent);
    border-color: var(--mwp-accent);
}

.btn-secondary {
    --pico-background-color: transparent;
    --pico-border-color: var(--border-color);
    --pico-color: var(--text-main);
}

.stepper-grid {
    display: grid;
    grid-template-columns: 120px 1fr 1fr;
    gap: 0.5rem;
    align-items: center;
    max-width: 380px;
}

.stepper-header {
    text-align: center;
    font-weight: 500;
    color: var(--text-muted);
    font-size: 0.85rem;
}

.stepper-row-label {
    /* font-size: 1rem; */
    font-weight: 500;
    color: var(--text-main);
}

.stepper-container {
    display: grid !important;
    grid-template-columns: 30px 1fr 30px;
    align-items: stretch !important;
    margin-bottom: 0 !important;
    height: 36px;
    background: var(--mwp-soft);
    border: 1px solid var(--mwp-border) !important;
    border-radius: 8px;
    box-shadow: none;
    overflow: hidden;
}

.stepper-container input {
    width: 100% !important;
    text-align: center;
    margin: 0 !important;
    padding: 0 !important;
    font-weight: 600;
    font-size: 1rem !important;
    background: var(--mwp-surface) !important;
    border: none !important;
    border-radius: 0 !important;
    height: 100% !important;
    color: var(--text-main) !important;
    box-shadow: none !important;
}

.stepper-btn {
    width: 100% !important;
    height: 100% !important;
    padding: 0 !important;
    font-size: 1.2rem !important;
    font-weight: 300 !important;
    margin: 0 !important;
    border: none !important;
    background: transparent !important;
    color: var(--text-main) !important;
    border-radius: 0 !important;
    display: flex !important;
    align-items: center !important;
    justify-content: center !important;
    cursor: pointer;
    transition: background 0.2s;
}

.stepper-btn:hover {
    background: var(--mwp-hover) !important;
}

.stepper-btn:first-child {
    border-right: 1px solid var(--mwp-divider) !important;
}

.stepper-btn:last-child {
    border-left: 1px solid var(--mwp-divider) !important;
}

.stepper-container:focus-within {
    outline: 2px solid var(--mwp-muted);
    outline-offset: 2px;
}

/* Chrome, Safari, Edge, Opera: Hide number spinners */
.stepper-container input::-webkit-outer-spin-button,
.stepper-container input::-webkit-inner-spin-button {
    -webkit-appearance: none;
    appearance: none;
    margin: 0;
}

/* Firefox: Hide number spinners */
.stepper-container input[type=number] {
    -moz-appearance: textfield;
    appearance: textfield;
}

.digit-toggles {
    display: flex;
    flex-wrap: wrap;
    gap: 0.35rem;
    margin-top: 0.5rem;
}

.digit-toggle {
    display: inline-flex;
    cursor: pointer;
    margin: 0 !important;
}

.digit-toggle input[type="checkbox"] {
    display: none;
}

.digit-toggle span {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 32px;
    background: var(--mwp-soft);
    border: 1px solid var(--mwp-border);
    border-radius: 6px;
    font-size: 1rem;
    font-weight: 500;
    transition: all 0.1s;
    user-select: none;
    color: var(--mwp-muted);
}

.digit-toggle input[type="checkbox"]+span {
    background: var(--mwp-soft);
    border-color: var(--mwp-border);
    color: var(--mwp-muted);
    text-decoration: line-through;
}

.digit-toggle input[type="checkbox"]:checked+span {
    background: var(--mwp-hover);
    border-color: var(--mwp-border);
    color: var(--text-main);
    text-decoration: none;
}

#practice-type-group,
#answer-key-group,
#grid-size-group {
    background: var(--mwp-soft);
    border-radius: 8px;
    box-shadow: none;
}

#answer-key-group {
    display: flex;
    max-height: 50px;
    opacity: 1;
    overflow: hidden;
    transition: max-height 0.25s ease, opacity 0.2s ease, margin 0.25s ease;
}

#answer-key-group.collapsed {
    max-height: 0;
    opacity: 0;
    margin-top: 0 !important;
    margin-bottom: 0 !important;
    pointer-events: none;
}

.p-type-btn,
.a-key-btn,
.grid-btn {
    border-color: var(--mwp-border);
    box-shadow: none;
}

.p-type-btn.outline,
.a-key-btn.outline,
.grid-btn.outline {
    background: var(--mwp-soft);
    color: var(--text-main);
}

.p-type-btn.outline:hover,
.a-key-btn.outline:hover,
.grid-btn.outline:hover {
    background: var(--mwp-hover);
    border-color: var(--mwp-muted);
}

.p-type-btn:not(.outline),
.a-key-btn:not(.outline),
.grid-btn:not(.outline) {
    background: var(--mwp-accent);
    border-color: var(--mwp-accent);
    color: #ffffff;
}

#generator-form button[type="submit"],
#btn-download {
    background: var(--mwp-accent);
    border-color: var(--mwp-accent);
    color: #ffffff;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgb(30 58 40 / 8%);
}

#generator-form button[type="submit"]:hover,
#btn-download:hover {
    background: var(--mwp-accent-hover);
    border-color: var(--mwp-accent-hover);
}

#btn-print,
#btn-customize-mobile {
    background: var(--mwp-soft);
    border-color: var(--mwp-border);
    border-radius: 8px;
    color: var(--text-main);
    box-shadow: none;
}

#btn-print:hover,
#btn-customize-mobile:hover {
    background: var(--mwp-hover);
}

/* Main Content Area */
.main-content {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    background: var(--mwp-surface);
    border: 1px solid var(--mwp-divider);
    border-radius: 14px;
    box-shadow: var(--mwp-shadow);
}

.main-header {
    height: auto;
    min-height: 70px;
    padding: 1rem;
    background: transparent;
    border-radius: 14px 14px 0 0;
    /* border-bottom: 1px solid var(--mwp-divider); */
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.main-header h2 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0;
}

.solver-header {
    padding: 1rem 1.5rem !important;
}

.preview-tabs,
#preview-tabs {
    display: inline-flex;
    align-items: center;
    background: var(--mwp-soft);
    border-radius: 9px;
    padding: 3px;
}

#tab-answers {
    max-width: 0;
    height: 0;
    opacity: 0;
    padding-left: 0 !important;
    padding-right: 0 !important;
    margin: 0 !important;
    border: none;
    overflow: hidden;
    white-space: nowrap;
    pointer-events: none;
    transition: max-width 0.25s ease, opacity 0.2s ease, padding 0.25s ease;
}

#tab-answers.visible {
    max-width: 180px;
    height: auto;
    opacity: 1;
    padding: 0.5rem 1.1rem !important;
    pointer-events: auto;
}

.tab-btn {
    display: inline-flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    border: none;
    background: transparent;
    padding: 0.5rem 1.1rem;
    font-size: 0.82rem;
    font-weight: 500;
    letter-spacing: 0.6px;
    text-transform: uppercase;
    color: var(--mwp-muted);
    border-radius: 7px;
    box-shadow: none;
    cursor: pointer;
    transition: all 0.2s ease;
    margin-bottom: 0;
    line-height: 1;
    position: relative;
    box-sizing: border-box;
}

.tab-btn .tab-icon,
.btn-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.tab-btn .tab-icon img,
.tab-btn .tab-icon svg,
.btn-icon svg {
    width: 17px;
    height: 17px;
    display: block;
}

.tab-btn:hover {
    color: var(--text-main);
    background: var(--mwp-hover);
}

.tab-btn.active {
    background: var(--mwp-surface);
    color: var(--primary, #2A623D);
}

.tab-btn.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--mwp-accent);
    border-radius: 3px 3px 0 0;
}

/* Suppress focus ring on mouse click, keep visible on keyboard navigation */
.tab-btn:focus:not(:focus-visible),
.p-type-btn:focus:not(:focus-visible),
.grid-btn:focus:not(:focus-visible),
.a-key-btn:focus:not(:focus-visible),
.stepper-btn:focus:not(:focus-visible),
#btn-toggle-sidebar:focus:not(:focus-visible) {
    --pico-box-shadow: none !important;
    box-shadow: none !important;
    outline: none !important;
}

#generator-form button:focus-visible,
#generator-form a:focus-visible,
#generator-form input:focus-visible,
#generator-form select:focus-visible,
.main-header button:focus-visible,
.top-header summary:focus-visible {
    outline: 2px solid var(--mwp-muted) !important;
    outline-offset: 3px;
    box-shadow: none;
}

#generator-form button:disabled,
.main-header button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    box-shadow: none;
}

.action-buttons {
    display: flex;
    gap: 0.75rem;
    margin-top: var(--pico-spacing);
}

.action-buttons .btn-primary {
    width: auto;
    padding: 0.6rem 1.2rem;
}

.preview-container {
    flex: 1;
    padding: 1rem;
    min-width: 0;
    display: flex;
    justify-content: center;
    align-items: stretch;
    padding-top: 0;
}

.placeholder,
#preview-placeholder {
    color: var(--text-muted);
    font-size: 1.1rem;
    padding: 2rem;
    background: var(--mwp-soft);
    border: 1px dashed var(--mwp-border);
    border-radius: 12px;
    text-align: center;
}

#pdf-preview {
    width: 100%;
    height: 100%;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    background: white;
}

.header-title-area {
    display: flex;
    align-items: center;
    gap: 2rem;
}

/* Responsive Layout */
@media (max-width: 768px) {
    body {
        height: auto;
        min-height: 100dvh;
        overflow-y: auto;
    }

    .app-container {
        flex-direction: column;
        height: auto;
        padding: 0.5rem 0.75rem 1rem;
        gap: 0.75rem;
    }

    .sidebar {
        display: none;
    }

    #btn-toggle-sidebar {
        display: none;
    }

    .sidebar.collapsed {
        width: 100%;
    }

    .sidebar.collapsed .sidebar-content {
        display: block;
    }

    .hamburger-btn,
    .settings-btn {
        display: flex;
        align-items: center;
        justify-content: center;
    }

    .settings-btn {
        padding: 0.25rem;
        background: transparent;
        border: none;
        color: var(--text-main);
        cursor: pointer;
    }

    #settings-modal summary {
        display: none !important;
    }

    #settings-modal > article {
        background: var(--mwp-surface);
        border: 1px solid var(--mwp-border);
        border-radius: 14px;
    }

    .top-header-container {
        display: flex;
        justify-content: space-between;
    }

    .top-header-center {
        display: none !important;
    }

    .top-header-menu {
        display: none;
        position: absolute;
        top: 100%;
        right: 0;
        background: var(--mwp-surface);
        border: 1px solid var(--mwp-border);
        border-radius: 10px;
        padding: 0.75rem;
        flex-direction: column;
        gap: 0.5rem;
        box-shadow: var(--mwp-shadow);
        min-width: 160px;
        z-index: 30;
    }

    .top-header-menu.open {
        display: flex;
    }

    .top-header-right {
        position: relative;
    }

    .sidebar-content {
        overflow-y: visible;
        padding-bottom: 0;
    }

    .main-header {
        flex-direction: column;
        height: auto;
        padding: 0.75rem;
        gap: 0.5rem;
        align-items: stretch;
    }

    .header-title-area {
        flex-direction: column;
        align-items: stretch;
        gap: 1rem;
    }

    .header-right-area {
        margin-top: 0;
    }

    .preview-tabs {
        width: 100%;
        /* margin-top: 1rem; */
    }

    .tab-btn {
        text-align: center;
        flex: auto;
    }

    .action-buttons {
        display: flex;
        flex-direction: row;
        width: 100%;
        gap: 0.75rem;
    }

    .action-buttons button {
        flex: 1;
        margin-bottom: 0 !important;
    }

    .preview-container {
        padding: 0.5rem;
        height: auto;
        align-items: stretch;
        justify-content: stretch;
    }

    #pdf-preview {
        flex: 1;
        min-height: 275px;
        width: 100%;
        height: auto;
    }
}

/* Solver View (Tabbed) */
.solver-app-view {
    display: flex;
    flex-direction: column;
    height: 100%;
    width: 100%;
    background: var(--pico-card-background-color);
    border-radius: 12px;
    overflow: hidden;
}


.solver-content {
    flex: 1;
    padding: 3rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 2rem;
    background: var(--pico-muted-border-color);
}

.nav-arrow {
    background: var(--bg-main) !important;
    border: 1px solid var(--border-color) !important;
    color: var(--text-main) !important;
    width: 60px !important;
    height: 60px !important;
    border-radius: 50% !important;
    font-size: 2.5rem !important;
    display: flex !important;
    align-items: center !important;
    justify-content: center !important;
    cursor: pointer;
    transition: all 0.2s;
    flex-shrink: 0;
    padding: 0 !important;
    line-height: 1;
}

.nav-arrow:hover {
    background: var(--primary) !important;
    border-color: var(--primary) !important;
    color: var(--pico-primary-inverse, white) !important;
}

.nav-arrow:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

.problem-container {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
}

.solver-success-badge {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 72px;
    height: 72px;
    background: #10b981;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 10px 25px rgba(16, 185, 129, 0.45);
    z-index: 50;
    pointer-events: none;
    animation: solverSuccessPop 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards;
}

@keyframes solverSuccessPop {
    0% { transform: translate(-50%, -50%) scale(0); opacity: 0; }
    60% { transform: translate(-50%, -50%) scale(1.15); opacity: 1; }
    100% { transform: translate(-50%, -50%) scale(1); opacity: 1; }
}

.solver-grid {
    display: grid;
    gap: 0;
    background: var(--pico-card-background-color);
}

.solver-cell {
    width: 44px;
    height: 44px;
    border: 0.5px solid var(--pico-form-element-border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-family: 'Courier Prime', 'Courier New', monospace;
    color: var(--text-main);
}

.solver-input {
    width: 100%;
    height: 100%;
    border: none !important;
    /* background: var(--pico-form-element-background-color) !important; */
    text-align: center;
    font-size: 1.5rem !important;
    font-family: 'Courier Prime', 'Courier New', monospace;
    font-weight: 600;
    padding: 0 !important;
    margin: 0 !important;
    color: var(--primary) !important;
    outline: none !important;
    display: block;
    caret-color: transparent !important;
    cursor: pointer;
}

.solver-input:focus {
    background: rgba(79, 70, 229, 0.05) !important;
    box-shadow: inset 0 0 0 2px var(--primary) !important;
    z-index: 1;
}

.solver-input.correct {
    background-color: #d4edda !important;
    color: #155724 !important;
}

.solver-input.incorrect {
    background-color: #f8d7da !important;
    color: #721c24 !important;
}

.solver-operator {
    font-weight: bold;
}

.solver-line {
    border-top: 2px solid var(--pico-color, #000) !important;
}

.solver-current:not(:empty) {
    background: rgb(255 251 206 / 80%) !important;
}

.solver-current .solver-input.correct {
    background-color: transparent !important;

}

.solver-carry {
    font-size: 0.9rem !important;
    color: var(--text-muted) !important;
    background: var(--pico-form-element-background-color) !important;
    height: 30px !important;
    width: 30px !important;
    margin: auto !important;
    border: 1px dashed var(--border-color) !important;
    border-radius: 4px;
    caret-color: transparent !important;
}

.solver-carry:focus {
    background: var(--pico-background-color) !important;
    border-style: solid !important;
    color: var(--primary) !important;
}

.solver-numpad {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.5rem;
    background: var(--pico-card-background-color);
    padding: 1rem;
}

.numpad-btn {
    width: 60px !important;
    height: 60px !important;
    font-size: 1.5rem !important;
    font-weight: 600 !important;
    background: var(--pico-form-element-background-color) !important;
    border: 1px solid var(--border-color) !important;
    color: var(--text-main) !important;
    border-radius: 8px !important;
    display: flex !important;
    align-items: center !important;
    justify-content: center !important;
    cursor: pointer;
    margin: 0 !important;
    padding: 0 !important;
    transition: all 0.1s;
}

.numpad-btn:hover,
.numpad-btn:active {
    background: var(--pico-form-element-active-background-color) !important;
    border-color: var(--primary) !important;
}

.numpad-btn.control-btn {
    font-size: 1.2rem !important;
    color: #dc3545 !important;
}

@media (max-width: 768px) {
    .solver-inner-wrap {
        flex-direction: column;
        gap: 1.5rem !important;
    }

    .solver-numpad {
        gap: 0.4rem;
        padding: 0.8rem;
    }

    .numpad-btn {
        width: 50px !important;
        height: 50px !important;
        font-size: 1.2rem !important;
    }

    .preview-container {
        padding: 0;
    }

    .solver-content {
        gap: 0 !important;
        padding: 0 !important;
        align-items: flex-end !important;
    }

    .app-container {
        margin: 0 !important;
    }

    .solver-app-view {
        border-radius: 0 !important;
        height: auto !important;
    }

    /* Daily Practice View Mobile Overrides */
    body.daily .main-content {
        min-height: unset !important;
    }

    body.daily .solver-app-view {
        height: auto !important;
    }

    .solver-header {
        display: flex !important;
        gap: 0;
        padding: 1.5rem !important;
    }
}

[type=button],
[type=reset],
[type=submit] {
    font-size: 0.8rem;
    letter-spacing: normal !important;
    text-transform: uppercase !important;
}

button.outline {
    color: #444;
}

select {
    font-size: 0.85rem;
    text-transform: uppercase;
}

svg {
    stroke-width: 1.2;
}

.header-left-area {
    display: flex;
    gap: 1.5rem;
    flex: 0 0 auto;
    justify-content: flex-start;
}

.header-middle-area {
    min-width: 0;
}

.header-right-area {
    flex: 1;
    display: flex;
    justify-content: flex-end;
    gap: 0.5rem;
}

@media (min-width: 769px) {
    .mobile-only-btn {
        display: none !important;
    }
}

body.daily header.main-header {
    display: none;
}

div#adobe-dc-view {
    height: auto !important;
}

body.preview_mode .sidebar,
body.preview_mode .top-header,
body.preview_mode #preview-tabs,
body.preview_mode #preview-placeholder,
body.preview_mode .header-right-area {
    display: none !important;
}

body.preview_mode .main-content {
    padding: 0 !important;
    max-width: 100% !important;
    border: none !important;
}

body.preview_mode .preview-container {
    border: none !important;
    margin: 0 !important;
    padding: 0 !important;
    background: transparent !important;
}

body.preview_mode .app-container {
    padding: 0 !important;
    margin: 0 !important;
}

/* Practice Modal Two-Column Layout */
.practice-modal-columns {
    display: flex;
    gap: 2rem;
    flex: 1;
}

.practice-modal-left {
    flex: 1;
    max-width: 450px;
}

.practice-modal-right {
    flex: 1;
    border-left: 1px solid var(--pico-muted-border-color);
    padding-left: 2rem;
    display: flex;
    flex-direction: column;
    min-height: 600px;
}

@media (max-width: 900px) {
    .practice-modal-columns {
        flex-direction: column;
        gap: 1.5rem;
    }

    .practice-modal-left {
        max-width: 100%;
        flex: none;
    }

    .practice-modal-right {
        border-left: none;
        border-top: 1px solid var(--pico-muted-border-color);
        padding-left: 0;
        padding-top: 1.5rem;
        min-height: 400px;
        flex: none;
        height: 60vh;
    }
}

.flex-label-setting {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-weight: 500;
    margin-bottom: 0.5rem;
    width: 100% !important;
}

.flex-label-setting input[role="switch"] {
    margin-left: 20px;
}

/* Hero Section */
.hero-container {
    padding: 1rem 1.5rem 0.5rem 1.5rem;
    background: transparent;
    flex-shrink: 0;
    width: 100%;
    max-width: 1600px;
    margin-inline: auto;
}

.hero-card {
    background: transparent;
    border: none;
    border-color: transparent;
    box-shadow: none;
    padding: 1.25rem 1.5rem;
}

.hero-breadcrumbs {
    margin-bottom: 0.5rem;
}

.hero-breadcrumbs ul {
    display: flex;
    align-items: center;
    list-style: none;
    padding: 0;
    margin: 0;
    gap: 0.5rem;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.hero-breadcrumbs li {
    align-items: center;
    gap: 0.5rem;
}

.hero-breadcrumbs li:not(:last-child)::after {
    content: "/";
    color: var(--text-muted);
    font-weight: 400;
}

.hero-breadcrumbs a {
    color: var(--text-muted);
    text-decoration: none;
}

.hero-breadcrumbs a:hover {
    text-decoration: underline;
}

.hero-breadcrumbs li.active {
    color: var(--primary);
    font-weight: 600;
}

.hero-title {
    font-size: 1.6rem;
    font-weight: 800;
    color: var(--text-main);
    margin: 0 0 0.5rem 0 !important;
}

.hero-description {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin: 0 !important;
    line-height: 1.4;
}

.mobile-dropdowns-row {
    display: none;
}

@media (max-width: 768px) {
    .hero-container {
        padding: 0.75rem 1rem;
    }

    .hero-card {
        padding: 1rem;
    }

    .hero-title {
        font-size: 1.3rem;
    }

    .hero-description {
        font-size: 0.85rem;
    }

    .mobile-dropdowns-row {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 0.75rem;
        margin-top: 0.75rem;
    }

    .mobile-dropdown {
        margin: 0 !important;
        position: relative;
    }

    .mobile-dropdown summary {
        display: flex !important;
        align-items: center;
        justify-content: flex-start;
        gap: 0.5rem;
        background: var(--mwp-soft) !important;
        border: 1px solid var(--mwp-border) !important;
        border-radius: 8px;
        padding: 0.65rem 1rem !important;
        font-size: 0.88rem !important;
        font-weight: 500 !important;
        color: var(--text-main) !important;
        box-shadow: none !important;
        cursor: pointer;
        width: 100%;
        box-sizing: border-box;
    }

    .mobile-dropdown summary:focus:not(:focus-visible) {
        box-shadow: none !important;
        outline: none !important;
    }

    .mobile-dropdown summary::after {
        margin-inline-start: auto !important;
    }

    .mobile-dropdown .dropdown-content {
        left: 0 !important;
        transform: none !important;
        width: calc(100vw - 2rem) !important;
        max-width: calc(100vw - 2rem) !important;
        grid-template-columns: 1fr !important;
        gap: 1rem !important;
        box-sizing: border-box;
    }

    .mobile-dropdowns-row > .mobile-dropdown:last-child .dropdown-content {
        left: auto !important;
        right: 0 !important;
    }

    .header-right-area {
        display: flex;
        flex-direction: row;
        flex-wrap: wrap;
        width: 100%;
        gap: 0.5rem;
        margin-top: 0;
    }

    .header-right-area button {
        flex: 1 1 0;
        margin: 0 !important;
        padding: 0.5rem 0.4rem !important;
        font-size: 0.75rem !important;
        gap: 0.35rem !important;
        white-space: normal;
    }

    .header-right-area button .btn-icon svg {
        width: 15px;
        height: 15px;
    }

    #btn-customize-mobile {
        /* color: var(--primary) !important; */
        /* border-color: var(--primary) !important; */
    }
}

/* Worksheet Content Section */
.worksheet-content-section {
    padding: 2.5rem 1.5rem;
    background: var(--mwp-surface);
    border-top: 1px solid var(--mwp-divider);
    margin-top: 1.5rem;
}

.worksheet-content-container {
    max-width: 960px;
    margin: 0 auto;
}

.worksheet-content-container h2 {
    font-size: 1.35rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    color: var(--text-main);
}

.worksheet-content-container h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-top: 1.5rem;
    margin-bottom: 0.5rem;
    color: var(--text-main);
}

.worksheet-content-container p {
    font-size: 0.95rem;
    line-height: 1.6;
    color: var(--text-main);
    margin-bottom: 0.75rem;
}

.worksheet-related-links {
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem;
    list-style: none;
    padding: 0;
    margin: 0.75rem 0 0 0;
}

.worksheet-related-links li {
    list-style: none;
    padding: 0;
    margin: 0;
}

.worksheet-related-links li a {
    display: inline-block;
    padding: 0.4rem 0.85rem;
    background: var(--mwp-soft);
    border: 1px solid var(--mwp-border);
    border-radius: 8px;
    color: var(--mwp-accent);
    text-decoration: none;
    font-size: 0.88rem;
    font-weight: 500;
    transition: all 0.15s ease;
}

.worksheet-related-links li a:hover {
    background: var(--mwp-accent);
    color: #fff;
    border-color: var(--mwp-accent);
}

.grade-hub-skills {
    margin-top: 0.85rem;
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.grade-hub-skills-title {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--mwp-muted);
}

.grade-hub-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.grade-skill-pill {
    display: inline-block;
    padding: 0.35rem 0.85rem;
    background: var(--mwp-soft);
    border: 1px solid var(--mwp-border);
    border-radius: 8px;
    color: var(--mwp-accent);
    text-decoration: none;
    font-size: 0.88rem;
    font-weight: 600;
    transition: all 0.15s ease;
}

.grade-skill-pill:hover {
    background: var(--mwp-accent);
    color: #fff;
    border-color: var(--mwp-accent);
}

/* Value Hook */
.value-hook {
    margin-top: 0.75rem;
    margin-bottom: 0;
    font-size: 1rem;
    color: var(--primary);
}

/* Features Overview (Homepage) */
.features-overview {
    margin-bottom: 2rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--mwp-divider);
}

.features-overview h2 {
    font-size: 1.35rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--text-main);
}

.features-overview > p {
    font-size: 0.95rem;
    line-height: 1.6;
    color: var(--text-main);
    margin-bottom: 1.25rem;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1.25rem;
    margin-top: 1rem;
}

.feature-item {
    background: var(--card-bg, #fff);
    border: 1px solid var(--mwp-border);
    border-radius: 10px;
    padding: 1.25rem;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
}

.feature-item h3 {
    font-size: 1.05rem;
    font-weight: 600;
    margin-top: 0;
    margin-bottom: 0.5rem;
    color: var(--text-main);
}

.feature-item p {
    font-size: 0.9rem;
    line-height: 1.55;
    color: var(--text-muted);
    margin-bottom: 0;
}

/* Topic & Grade Features */
.topic-features,
.grade-features {
    margin-bottom: 1.5rem;
}