:root {
    --primary-color: #1769e0;
    --primary-hover: #0f5bc7;
    --bg-color: #f3f6fa;
    --text-dark: #17202b;
    --text-muted: #667085;
    --border-color: #d9e0e8;
    --panel-bg: #ffffff;

    --success-color: #18794e;
    --warning-color: #9a5b00;
    --error-color: #d1291d;

    /* Text drawn on top of --primary-color. */
    --on-primary: #ffffff;

    /* Surfaces that sit on top of the panel (fix previews, emoji picker). */
    --raised-bg: #ffffff;
    --raised-bg-hover: #edf5ff;

    /* The mail button keeps its own green in both themes. */
    --email-color: #188038;
    --email-hover: #137333;

    /* Native widgets (form fields, scrollbars) follow the light theme. */
    color-scheme: light;
}

html.dark-theme {
    --primary-color: #72b7ff;
    --primary-hover: #91c8ff;

    --bg-color: #0f141b;
    --text-dark: #edf2f7;
    --text-muted: #aab5c3;
    --border-color: #303b49;
    --panel-bg: #1a222d;

    --success-color: #63d391;
    --warning-color: #f2b866;
    --error-color: #ff756d;

    /* The dark theme's primary is a light blue, so text on it must be dark. */
    --on-primary: #07111d;

    --raised-bg: #222c38;
    --raised-bg-hover: #2c3948;

    --email-color: #3fba72;
    --email-hover: #55c783;

    color-scheme: dark;
}



* {
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
        Helvetica, Arial, sans-serif;

    background-color: var(--bg-color);
    color: var(--text-dark);

    margin: 0;
    padding: 40px 20px;

    display: flex;
    flex-direction: column;
    align-items: center;
}

.header-section {
    text-align: center;
    margin-bottom: 30px;
}

h1 {
    font-size: 2.5rem;
    margin: 0 0 10px 0;
    font-weight: 800;
}

p.description {
    color: var(--text-muted);
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.6;
    font-size: 1.1rem;
}

.tool-container {
    background-color: var(--panel-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;

    padding: 24px;

    width: 100%;
    max-width: 900px;

    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}


/* Statistics */

/* Compact Statistics */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 8px;
    margin-bottom: 16px;
}


.stat-box {
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 6px;

    padding: 8px 4px;
    text-align: center;
}

.stat-value {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 2px;
}

.stat-label {
    font-size: 0.68rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.2px;
    font-weight: 600;
}


/* Visually Hidden */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0 0 0 0);
    white-space: nowrap;
    border: 0;
}


/* Focus */
:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}


/* Text Area */
textarea {
    width: 100%;
    height: 250px;

    padding: 16px;

    border: 1px solid var(--border-color);
    border-radius: 8px;

    font-size: 1rem;
    line-height: 1.6;

    resize: vertical;

    font-family: inherit;

    margin-bottom: 20px;

    transition: border-color 0.2s ease;
}

textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}


/* Buttons */
.controls {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

button {
    padding: 10px 20px;

    font-size: 1rem;
    font-weight: 600;

    border-radius: 6px;

    cursor: pointer;
    border: none;

    transition:
        background-color 0.2s ease,
        transform 0.1s ease;
}

button:active {
    transform: translateY(1px);
}

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

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

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

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

.btn-email {
    background-color: var(--email-color);
    color: #ffffff;
}

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


/* Writing Check */
.writing-check,
.email-section {
    margin-top: 30px;
    padding-top: 24px;

    border-top: 1px solid var(--border-color);
}

h2 {
    font-size: 1.25rem;
    margin: 0 0 16px 0;
}

.check-results {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.check-empty {
    color: var(--text-muted);
    margin: 0;
}

.check-item {
    padding: 12px 14px;
    border-radius: 6px;

    background-color: var(--bg-color);

    border-left: 4px solid var(--border-color);

    line-height: 1.5;
}

.check-item.success {
    border-left-color: var(--success-color);
    color: var(--success-color);
}

.check-item.warning {
    border-left-color: var(--warning-color);
    color: var(--warning-color);
}

.check-item.error {
    border-left-color: var(--error-color);
    color: var(--error-color);
}

.check-item.info {
    border-left-color: var(--border-color);
    color: var(--text-muted);
    font-style: italic;
}


/* Email */
.email-fields {
    display: grid;
    grid-template-columns: 80px 1fr;

    gap: 12px;

    margin-bottom: 18px;

    align-items: center;
}

.email-fields label {
    font-weight: 600;
    color: var(--text-muted);
}

.email-fields input {
    width: 100%;

    padding: 11px 12px;

    border: 1px solid var(--border-color);
    border-radius: 6px;

    font-size: 1rem;
    font-family: inherit;
}

.email-fields input:focus {
    outline: none;
    border-color: var(--primary-color);
}

.email-fields input[aria-invalid="true"] {
    border-color: var(--error-color);
}


/* Mobile */
@media (max-width: 600px) {

    body {
        padding: 14px 10px;
    }

    .header-section {
        margin-bottom: 14px;

        /* Keeps the centred title clear of the fixed theme button. */
        padding-inline: 34px;
    }

    h1 {
        font-size: 1.65rem;
        margin-bottom: 5px;
    }

    p.description {
        font-size: 0.9rem;
        line-height: 1.35;
    }

    .tool-container {
        padding: 14px;
        border-radius: 10px;
    }

    .stats-grid {
    	gap: 6px;
    	margin-bottom: 12px;
	}


    .stat-box {
        padding: 7px 3px;
        border-radius: 6px;
    }

    .stat-value {
        font-size: 1.15rem;
    }

    .stat-label {
        font-size: 0.62rem;
    }

    textarea {
        height: 190px;
        padding: 12px;
        margin-bottom: 12px;
        font-size: 0.95rem;
        line-height: 1.5;
    }

    .controls {
        gap: 7px;
    }

    .controls button {
        flex: 1 1 auto;
        padding: 9px 10px;
        font-size: 0.9rem;
    }

    .email-fields {
        grid-template-columns: 1fr;
        gap: 6px;
    }

    .email-fields label {
        margin-top: 6px;
    }

    .writing-check,
    .email-section {
        margin-top: 22px;
        padding-top: 18px;
    }
}




/* Writing Check Actions */
.check-item {
    display: grid;
    grid-template-columns: 1fr auto;
    align-items: start;
    gap: 8px 12px;
}

.check-item > span {
    grid-column: 1;
}

.check-item .fix-preview {
    grid-column: 1;
}

.check-item .fix-btn {
    grid-column: 2;
    grid-row: 1 / span 2;
    align-self: center;
}


.fix-btn {
    display: inline-block;

    padding: 6px 12px;

    background-color: var(--raised-bg);
    color: var(--primary-color);

    border: 1px solid var(--primary-color);
    border-radius: 5px;

    font-size: 0.85rem;
    font-weight: 600;

    cursor: pointer;
}

.fix-btn:hover {
    background-color: var(--raised-bg-hover);
}

.check-actions {
    display: flex;
    justify-content: flex-end;
    margin-top: 8px;
}

.fix-all-btn {
    background-color: var(--primary-color);
    color: var(--on-primary);
}

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

@media (max-width: 600px) {

    .check-item {
        align-items: flex-start;
    }

    .fix-btn {
        padding: 7px 10px;
    }
}

.fix-preview {
    margin-top: 10px;
    padding: 10px 12px;

    background-color: var(--raised-bg);

    border: 1px solid var(--border-color);
    border-radius: 6px;

    font-size: 0.9rem;
    line-height: 1.5;
}

.fix-preview div + div {
    margin-top: 6px;
}

.fix-preview strong {
    display: inline-block;
    min-width: 58px;
    font-weight: 700;
}

.fix-preview div:first-child strong {
    color: var(--error-color);
}

.fix-preview div:last-child strong {
    color: var(--success-color);
}

.fix-preview div:first-child {
    color: var(--text-muted);
}

.fix-preview div:last-child {
    color: var(--text-dark);
}


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

.undo-btn:hover {
    background-color: var(--raised-bg-hover);
}


.issue-count {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-muted);
    margin-left: 8px;
}


/* Compact Mobile Lower Sections */
@media (max-width: 600px) {

    .writing-check,
    .email-section {
        margin-top: 16px;
        padding-top: 12px;
    }

    .writing-check h2,
    .email-section h2 {
        font-size: 1rem;
        margin-bottom: 9px;
    }

    .check-results {
        gap: 6px;
    }

    .check-empty {
        font-size: 0.78rem;
        line-height: 1.3;
    }

    .check-item {
        padding: 8px 10px;
        font-size: 0.78rem;
        line-height: 1.35;
        gap: 8px;
    }

    .issue-count {
        font-size: 0.72rem;
        margin-left: 4px;
    }

    .fix-btn {
        padding: 5px 9px;
        font-size: 0.72rem;
        flex-shrink: 0;
    }

    .check-actions {
        margin-top: 5px;
    }

    .fix-all-btn {
        padding: 7px 11px;
        font-size: 0.8rem;
    }

    .email-fields {
        gap: 4px;
        margin-bottom: 10px;
    }

    .email-fields label {
        font-size: 0.78rem;
        margin-top: 3px;
    }

    .email-fields input {
        padding: 8px 9px;
        font-size: 0.85rem;
    }

    .btn-email {
        padding: 8px 14px;
        font-size: 0.85rem;
    }
}



/* Email Preview */
.email-preview {
    margin-top: 18px;
    margin-bottom: 18px;
}

.email-preview h3 {
    font-size: 1rem;
    margin: 0 0 10px 0;
}

.email-preview-card {
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 12px;
}

.preview-row {
    display: flex;
    gap: 10px;
    margin-bottom: 8px;
}

.preview-label {
    flex: 0 0 70px;
    color: var(--text-muted);
    font-weight: 600;
    font-size: 0.85rem;
}

.preview-value {
    min-width: 0;
    word-break: break-word;
    font-size: 0.9rem;
}

.preview-body {
    border-top: 1px solid var(--border-color);
    padding-top: 10px;
    margin-top: 4px;
}

.preview-body p {
    margin: 5px 0 0 0;
    white-space: pre-wrap;
    word-break: break-word;
    line-height: 1.5;
    font-size: 0.9rem;
}


@media (max-width: 600px) {

    .email-preview {
        margin-top: 12px;
        margin-bottom: 12px;
    }

    .email-preview h3 {
        font-size: 0.9rem;
        margin-bottom: 7px;
    }

    .email-preview-card {
        padding: 9px;
    }

    .preview-row {
        gap: 7px;
        margin-bottom: 5px;
    }

    .preview-label {
        flex-basis: 55px;
        font-size: 0.72rem;
    }

    .preview-value,
    .preview-body p {
        font-size: 0.78rem;
    }

    .preview-body {
        padding-top: 7px;
    }
}


.email-ready-status {
    display: inline-block;

    margin-bottom: 10px;
    padding: 4px 8px;

    background-color: var(--raised-bg);
    color: var(--primary-color);

    border-radius: 5px;

    font-size: 0.75rem;
    font-weight: 600;
}

.email-ready-status.ready {
    background-color: var(--raised-bg-hover);
    color: var(--success-color);
}


@media (max-width: 600px) {

    .email-ready-status {
        margin-bottom: 7px;
        padding: 3px 6px;
        font-size: 0.68rem;
    }
}


.email-status {
    min-height: 18px;
    margin: 0 0 8px 0;

    font-size: 0.85rem;
    color: var(--error-color);
    font-weight: 600;
}

.email-status.success {
    color: var(--success-color);
}


@media (max-width: 600px) {

    .email-status {
        font-size: 0.75rem;
        margin-bottom: 6px;
    }
}


.btn-email.ready {
    background-color: var(--email-color);
}

.btn-email.ready:hover {
    background-color: var(--email-hover);
}

.btn-email:not(.ready) {
    background-color: #687382;
}

.btn-email:not(.ready):hover {
    background-color: #596371;
}


/* Emoji Toolbar */
.emoji-toolbar {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}



.emoji-btn {
    padding: 10px 14px;

    background-color: var(--bg-color);
    color: var(--text-dark);

    border: 1px solid var(--border-color);
    border-radius: 6px;

    font-size: 1rem;
}

.emoji-btn:hover {
    background-color: var(--raised-bg-hover);
}




.emoji-picker {
    position: absolute;
    z-index: 10;

    display: grid;
    grid-template-columns: repeat(8, minmax(0, 1fr));
    gap: 4px;

    width: 280px;
    padding: 8px;

    top: calc(100% + 5px);
    right: 0;

    background-color: var(--raised-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;

    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.12);

    box-sizing: border-box;
}

.emoji-picker[hidden] {
    display: none;
}

.emoji-picker button {
    width: 100%;
    min-width: 0;

    padding: 5px 2px;

    background: transparent;
    border: none;
    border-radius: 5px;

    font-size: 1.2rem;
    line-height: 1;

    display: flex;
    align-items: center;
    justify-content: center;
}

.emoji-picker button:hover {
    background-color: var(--bg-color);
}




@media (max-width: 600px) {

    .emoji-btn {
        padding: 5px 9px;
        font-size: 0.9rem;
    }

    .emoji-picker {
        width: min(250px, calc(100vw - 30px));

        grid-template-columns: repeat(8, minmax(0, 1fr));

        gap: 3px;
        padding: 7px;
    }

    .emoji-picker button {
        width: 100%;
        min-width: 0;

        padding: 4px 2px;

        font-size: 1.05rem;
        line-height: 1.1;

        display: flex;
        align-items: center;
        justify-content: center;
    }
}


@media (max-width: 389px) {

    .controls {
        flex-wrap: wrap;
        gap: 6px;
    }

    .controls > button:not(.emoji-btn) {
        flex: 1 1 0;
        min-width: 0;

        padding: 9px 6px;
        font-size: 0.78rem;
    }

    .emoji-toolbar {
        flex: 0 0 100%;
        display: flex;
        justify-content: flex-end;
    }

    .emoji-btn {
        width: 42px;
        padding: 8px 0;
        font-size: 0.9rem;
    }

    .emoji-picker {
        width: min(250px, calc(100vw - 30px));

        grid-template-columns: repeat(8, minmax(0, 1fr));

        gap: 3px;
        padding: 6px;

        right: 0;
    }

    .emoji-picker button {
        width: 100%;
        min-width: 0;

        padding: 4px 2px;

        font-size: 1rem;
        line-height: 1.1;

        display: flex;
        align-items: center;
        justify-content: center;
    }
}

/* Larger Screens */
@media (min-width: 901px) {

    body {
        padding: 24px 20px;
    }

    .header-section {
        margin-bottom: 18px;
    }

    h1 {
        font-size: 2.25rem;
        margin-bottom: 6px;
    }

    p.description {
        font-size: 1rem;
        line-height: 1.4;
    }

    .tool-container {
        padding: 22px;
        max-width: 1000px;
    }

    .stats-grid {
        margin-bottom: 14px;
    }

    .stat-box {
        padding: 9px 5px;
    }

    .stat-value {
        font-size: 1.3rem;
    }

    textarea {
        height: 360px;
        margin-bottom: 14px;
    }

    .controls {
        gap: 8px;
    }

    body {
        padding-top: 14px;
        padding-bottom: 14px;
    }

    /* Header */
    .header-section {
        margin-bottom: 8px;
    }

    h1 {
        font-size: 2rem;
        margin-bottom: 3px;
    }

    p.description {
        font-size: 0.9rem;
        line-height: 1.25;
        max-width: 700px;
    }

    /* Main container */
    .tool-container {
        padding: 14px 18px;
        border-radius: 10px;
    }

    /* Statistics */
    .stats-grid {
        gap: 6px;
        margin-bottom: 8px;
    }

    .stat-box {
        padding: 5px 4px;
        border-radius: 5px;
    }

    .stat-value {
        font-size: 1.1rem;
        margin-bottom: 1px;
    }

    .stat-label {
        font-size: 0.62rem;
    }

    /* Writing area */
    textarea {
        height: 300px;
        padding: 11px 12px;
        margin-bottom: 8px;
        font-size: 0.95rem;
        line-height: 1.45;
        border-radius: 7px;
    }

    /* Main buttons */
    .controls {
        gap: 5px;
    }

    .controls button {
        padding: 7px 14px;
        font-size: 0.9rem;
    }

    /* Writing Check + Email */
    .writing-check,
    .email-section {
        margin-top: 14px;
        padding-top: 11px;
    }

    .writing-check h2,
    .email-section h2 {
        font-size: 1.05rem;
        margin-bottom: 8px;
    }

    .check-results {
        gap: 6px;
    }

    .check-item {
        padding: 8px 10px;
        line-height: 1.35;
    }

    .fix-preview {
        margin-top: 6px;
        padding: 7px 9px;
        line-height: 1.35;
    }

    .check-actions {
        margin-top: 5px;
    }

    /* Email fields */
    .email-fields {
        gap: 7px;
        margin-bottom: 9px;
    }

    .email-fields input {
        padding: 8px 10px;
        font-size: 0.9rem;
    }

    .email-fields label {
        font-size: 0.85rem;
    }

    .btn-email {
        padding: 7px 14px;
        font-size: 0.9rem;
    }

    /* Email preview */
    .email-preview {
        margin-top: 10px;
        margin-bottom: 10px;
    }

    .email-preview h3 {
        font-size: 0.95rem;
        margin-bottom: 6px;
    }

    .email-preview-card {
        padding: 9px;
    }

    .preview-row {
        gap: 8px;
        margin-bottom: 5px;
    }

    .preview-label {
        flex-basis: 65px;
        font-size: 0.8rem;
    }

    .preview-value,
    .preview-body p {
        font-size: 0.85rem;
    }

    .preview-body {
        padding-top: 7px;
        margin-top: 3px;
    }

    /* Status messages */
    .email-ready-status {
        margin-bottom: 6px;
        padding: 3px 7px;
        font-size: 0.7rem;
    }

    .email-status {
        min-height: 15px;
        margin-bottom: 5px;
        font-size: 0.8rem;
    }
}


.theme-toggle {
    position: fixed;
    top: 14px;
    right: 16px;

    z-index: 1000;

    width: 40px;
    height: 40px;

    padding: 0;

    display: flex;
    align-items: center;
    justify-content: center;

    background-color: var(--panel-bg);
    color: var(--text-dark);

    border: 1px solid var(--border-color);
    border-radius: 50%;

    font-size: 1.05rem;

    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.12);
}

.theme-toggle:hover {
    background-color: var(--bg-color);
}

/* Version badge, bottom-left corner. */
.app-version {
    position: fixed;
    left: 16px;
    bottom: 12px;

    z-index: 1;

    color: var(--text-muted);
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.2px;

    user-select: none;
}


@media (max-width: 600px) {

    .theme-toggle {
        top: 8px;
        right: 8px;

        width: 34px;
        height: 34px;

        font-size: 0.9rem;
    }

    .app-version {
        left: 10px;
        bottom: 8px;

        font-size: 0.68rem;
    }
}


/* Confirm Dialog
   ========================= */

.confirm-overlay {
    position: fixed;
    z-index: 100;

    inset: 0;

    display: flex;
    align-items: center;
    justify-content: center;

    padding: 20px;

    background-color: rgba(15, 20, 27, 0.55);
}

.confirm-overlay[hidden] {
    display: none;
}

.confirm-dialog {
    width: min(420px, 100%);
    max-height: 85vh;
    overflow-y: auto;

    padding: 20px;

    background-color: var(--panel-bg);
    border: 1px solid var(--border-color);
    border-radius: 10px;
}

.confirm-title {
    margin: 0 0 8px;
    font-size: 1.1rem;
}

.confirm-body {
    margin: 0 0 18px;

    color: var(--text-muted);
    font-size: 0.92rem;
    line-height: 1.5;
}

.confirm-actions {
    display: flex;
    justify-content: flex-end;
    gap: 8px;
}


@media (max-width: 600px) {

    .confirm-dialog {
        padding: 16px;
    }

    .confirm-title {
        font-size: 1rem;
    }

    .confirm-body {
        margin-bottom: 14px;
        font-size: 0.88rem;
    }

    .confirm-actions {
        gap: 6px;
    }

    .confirm-actions button {
        flex: 1;
        padding: 9px 10px;
        font-size: 0.85rem;
    }
}