/* ====================================================================
   EINKCHESS.CSS — High Contrast Monochrome Stylesheet for E-ink & Kindle
   No emojis/icons (pure text/glyphs for Kindle WebKit compatibility)
   No select dropdowns (pure clickable button lists & segmented controls)
   Auto-responsive & Device-specific Tuning (Kindle Basic 6", Paperwhite, Oasis, Scribe)
   ==================================================================== */

/* --- 1. CSS Reset & Typography --- */
* {
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    -webkit-tap-highlight-color: transparent;
}

body {
    background-color: #ffffff;
    color: #000000;
    font-family: "Amazon Ember", "Helvetica Neue", Helvetica, Arial, sans-serif;
    font-size: 14px;
    line-height: 1.25;
    text-rendering: optimizeLegibility;
    padding: 0;
    margin: 0;
    overflow-x: hidden;
}

/* --- 2. Layout Container --- */
.app-container {
    width: 100%;
    max-width: 500px;
    margin: 0 auto;
    padding: 2px 6px 2px 6px;
    display: block;
}

/* --- 3. Persistent Header (Compact 1-Line) --- */
.header {
    border-bottom: 2px solid #000000;
    padding: 2px 0;
    margin-bottom: 2px;
    display: block;
    clear: both;
}

.header-top {
    display: table;
    width: 100%;
    table-layout: auto;
}

.header-logo {
    display: table-cell;
    vertical-align: middle;
    font-size: 16px;
    font-weight: bold;
    text-decoration: none;
    color: #000000;
    white-space: nowrap;
    width: 1%;
    padding-right: 6px;
}

.header-logo:hover,
.header-logo:active {
    text-decoration: underline;
}

.header-center {
    display: table-cell;
    vertical-align: middle;
    text-align: center;
    font-size: 13px;
    font-weight: bold;
}

.header-actions {
    display: table-cell;
    vertical-align: middle;
    text-align: right;
    white-space: nowrap;
    width: 1%;
}

.elo-badge {
    display: inline-block;
    border: 1px solid #000000;
    padding: 1px 5px;
    background-color: #f0f0f0;
    font-size: 12px;
    margin: 0 1px;
}

/* --- 4. Buttons & Controls (Kindle Optimized) --- */
button,
.btn {
    -webkit-appearance: none !important;
    -moz-appearance: none !important;
    appearance: none !important;
    border-radius: 0 !important;
    -webkit-border-radius: 0 !important;
    box-shadow: none !important;
    -webkit-box-shadow: none !important;
    outline: none;
}

.btn {
    display: inline-block;
    padding: 5px 8px;
    background-color: #ffffff;
    color: #000000;
    border: 2px solid #000000 !important;
    font-size: 13px;
    font-weight: bold;
    text-decoration: none;
    text-align: center;
    cursor: pointer;
    margin: 1px;
    line-height: normal;
}

.btn:active {
    background-color: #000000 !important;
    color: #ffffff !important;
}

.btn-primary {
    background-color: #000000 !important;
    color: #ffffff !important;
    border: 2px solid #000000 !important;
}

.btn-primary:active {
    background-color: #ffffff !important;
    color: #000000 !important;
}

.btn-sm {
    padding: 3px 6px;
    font-size: 12px;
    border: 2px solid #000000 !important;
}

.btn-donate {
    border: 2px dashed #000000 !important;
    background-color: #f0f0f0;
}

.btn-lang-toggle {
    font-weight: bold;
    min-width: 36px;
    text-align: center;
}

.btn-block {
    display: block;
    width: 100%;
    margin: 6px 0;
    padding: 8px;
    font-size: 14px;
}

/* Button Group / Segmented Controls (Replaces <select>) */
.btn-group {
    display: table;
    width: 100%;
    margin: 4px 0;
    table-layout: fixed;
}

.btn-group-item {
    display: table-cell;
    padding: 6px 2px;
    text-align: center;
    background-color: #ffffff;
    color: #000000;
    border: 2px solid #000000 !important;
    font-size: 12px;
    font-weight: bold;
    cursor: pointer;
    user-select: none;
    -webkit-user-select: none;
}

.btn-group-item.active {
    background-color: #000000 !important;
    color: #ffffff !important;
}

/* --- 6. Chess Board Layout (Default / Basic 6") --- */
.board-container {
    width: 100%;
    max-width: 460px;
    margin: 0 auto 3px auto;
    position: relative;
}

.chess-board {
    width: 100%;
    height: 100%;
    border: 2px solid #000000;
    display: table;
    table-layout: fixed;
    border-collapse: collapse;
    background-color: #ffffff;
}

.board-row {
    display: table-row;
    height: 12.5%;
}

.sq {
    display: table-cell;
    width: 12.5%;
    height: 12.5%;
    position: relative;
    text-align: center;
    vertical-align: middle;
    padding: 0;
    margin: 0;
    cursor: pointer;
    user-select: none;
    -webkit-user-select: none;
}

/* Square Colors (E-ink High Contrast) */
.sq.light {
    background-color: #ffffff;
}

.sq.dark {
    background-color: #b0b0b0;
}

/* Selected Square */
.sq.selected {
    outline: 3px solid #000000;
    outline-offset: -3px;
    background-color: #d8d8d8;
}

/* Last Move Indicator (Dashed outline on from & to squares) */
.sq.last-from,
.sq.last-to {
    outline: 2px dashed #000000 !important;
    outline-offset: -2px !important;
}

/* Valid Move Hint */
.sq.hint-move::after {
    content: "";
    position: absolute;
    top: 50%;
    left: 50%;
    width: 26%;
    height: 26%;
    margin-top: -13%;
    margin-left: -13%;
    background-color: #000000;
    border-radius: 50%;
    opacity: 0.75;
}

.sq.hint-capture::after {
    content: "";
    position: absolute;
    top: 50%;
    left: 50%;
    width: 70%;
    height: 70%;
    margin-top: -35%;
    margin-left: -35%;
    border: 2px solid #000000;
    border-radius: 50%;
}

/* King in Check */
.sq.in-check {
    background-color: #555555 !important;
    outline: 2px double #ffffff;
    outline-offset: -2px;
}

/* Chess Piece Glyph Inside Square */
.piece {
    width: 100%;
    height: 100%;
    display: table;
    table-layout: fixed;
    text-align: center;
    font-size: 36px;
    line-height: 1;
    font-weight: normal;
    pointer-events: none;
}

.piece-inner {
    display: table-cell;
    vertical-align: middle;
    text-align: center;
    line-height: 1;
}

/* White Pieces */
.piece-w {
    color: #000000;
}

/* Black Pieces */
.piece-b {
    color: #000000;
}

/* --- 7. Status & Controls Area --- */
.status-bar {
    border: 2px solid #000000;
    padding: 2px 4px;
    margin: 2px 0 3px 0;
    background-color: #f9f9f9;
    display: table;
    width: 100%;
    table-layout: fixed;
    min-height: 26px;
}

.status-captured {
    display: table-cell;
    vertical-align: middle;
    width: 26%;
    font-size: 15px;
    line-height: 1;
    overflow: hidden;
    white-space: nowrap;
    letter-spacing: -1px;
}

#captured-white {
    text-align: left;
    padding-left: 2px;
}

#captured-black {
    text-align: right;
    padding-right: 2px;
}

.status-text {
    display: table-cell;
    vertical-align: middle;
    text-align: center;
    font-size: 12px;
    font-weight: bold;
    line-height: 1.2;
    width: 48%;
}

.action-bar {
    text-align: center;
    margin: 4px 0 2px 0;
}

.action-bar .btn {
    min-height: 44px;
    padding: 10px 8px;
    line-height: 20px;
    margin: 2px 2px;
}

/* --- 8. Cards & Menus (Home Screen) --- */
.home-container {
    max-width: 520px;
    min-height: 100vh;
    display: -webkit-box;
    display: -webkit-flex;
    display: flex;
    -webkit-box-orient: vertical;
    -webkit-flex-direction: column;
    flex-direction: column;
    padding: 4px 8px;
}

.home-header {
    padding: 2px 0 4px 0;
    margin-bottom: 4px;
    flex-shrink: 0;
}

.home-header .header-logo {
    font-size: 18px;
    font-weight: bold;
}

.home-header .elo-badge {
    font-size: 12px;
    padding: 2px 6px;
    font-weight: bold;
}

.home-header .btn-sm {
    padding: 5px 8px;
    font-size: 12px;
}

.home-modes-container {
    display: -webkit-box;
    display: -webkit-flex;
    display: flex;
    -webkit-box-orient: vertical;
    -webkit-flex-direction: column;
    flex-direction: column;
    -webkit-box-flex: 1;
    -webkit-flex: 1;
    flex: 1;
    justify-content: space-between;
    margin: 2px 0;
}

.home-card {
    display: -webkit-box;
    display: -webkit-flex;
    display: flex;
    -webkit-box-orient: vertical;
    -webkit-flex-direction: column;
    flex-direction: column;
    justify-content: space-between;
    -webkit-box-flex: 1;
    -webkit-flex: 1;
    flex: 1;
    min-height: 27vh;
    border: 2px solid #000000;
    padding: 10px 12px;
    margin: 6px 0;
    background-color: #ffffff;
}

.home-card .card-header {
    border-bottom: 2px solid #000000;
    padding-bottom: 4px;
    margin-bottom: 4px;
    display: table;
    width: 100%;
}

.home-card .card-title {
    font-size: 17px;
    font-weight: bold;
    display: table-cell;
    vertical-align: middle;
}

.home-card .card-tag {
    display: table-cell;
    text-align: right;
    vertical-align: middle;
    font-size: 12px;
    font-weight: bold;
    padding: 2px 6px;
    background-color: #f0f0f0;
    border: 1px solid #000000;
    white-space: nowrap;
}

.home-card .card-desc {
    font-size: 14px;
    line-height: 1.35;
    color: #222222;
    margin: 4px 0;
    -webkit-box-flex: 1;
    -webkit-flex: 1;
    flex: 1;
    display: -webkit-box;
    display: -webkit-flex;
    display: flex;
    align-items: center;
}

.home-card .card-btn {
    min-height: 44px;
    font-size: 15px;
    font-weight: bold;
    padding: 8px 10px;
    margin: 4px 0 0 0;
    width: 100%;
    display: block;
}

.card {
    border: 2px solid #000000;
    padding: 10px 12px;
    margin: 6px 0;
    background-color: #ffffff;
}

.card-header {
    font-size: 16px;
    font-weight: bold;
    border-bottom: 2px solid #000000;
    padding-bottom: 4px;
    margin-bottom: 6px;
    display: table;
    width: 100%;
}

.card-title {
    display: table-cell;
    vertical-align: middle;
}

.card-tag {
    display: table-cell;
    text-align: right;
    font-size: 12px;
    font-weight: bold;
    text-transform: uppercase;
}

.card-desc {
    font-size: 14px;
    margin-bottom: 6px;
    color: #222222;
    line-height: 1.35;
}

/* --- 9. Modals (Confirm Resign, Game Over, Donate Ko-fi) --- */
.modal-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #000000;
    background-color: rgba(0, 0, 0, 0.65);
    z-index: 999;
    text-align: center;
    padding: 10px 6px;
}

.modal-overlay.active {
    display: block;
}

.modal-box {
    display: inline-block;
    background-color: #ffffff;
    color: #000000;
    border: 3px solid #000000;
    padding: 16px;
    max-width: 450px;
    width: 95%;
    text-align: left;
    margin-top: 5vh;
}

.modal-title {
    font-size: 16px;
    font-weight: bold;
    border-bottom: 2px solid #000000;
    padding-bottom: 6px;
    margin-bottom: 10px;
}

.modal-body {
    font-size: 14px;
    margin-bottom: 12px;
    line-height: 1.35;
}

.modal-footer {
    text-align: right;
    border-top: 1px solid #000000;
    padding-top: 8px;
}

/* QR Code Display for Ko-fi & Momo */
.qr-wrapper {
    text-align: center;
    margin: 8px 0;
}

.qr-item {
    display: inline-block;
    width: 160px;
    margin: 6px;
    padding: 8px;
    background-color: #ffffff;
    border: 1px solid #000000;
    vertical-align: top;
    text-align: center;
}

.qr-item-title {
    font-size: 12px;
    font-weight: bold;
    margin-bottom: 6px;
    border-bottom: 1px solid #000000;
    padding-bottom: 2px;
    text-transform: uppercase;
}

.qr-image {
    max-width: 100%;
    max-height: 140px;
    height: auto;
    display: inline-block;
    border: 2px solid #000000;
}

.qr-link-text {
    font-family: monospace;
    font-size: 12px;
    font-weight: bold;
    margin-top: 4px;
    word-break: break-all;
}

/* --- 10. Pawn Promotion Modal (High-Contrast E-ink) --- */
.promo-options {
    display: table;
    width: 100%;
    table-layout: fixed;
    border-collapse: separate;
    border-spacing: 4px 0;
    margin: 10px 0;
}

.promo-btn {
    display: table-cell;
    vertical-align: middle;
    text-align: center;
    padding: 8px 2px;
    border: 2px solid #000000 !important;
    background-color: #ffffff;
    cursor: pointer;
    min-height: 52px;
    user-select: none;
    -webkit-user-select: none;
}

.promo-btn:hover,
.promo-btn:active {
    background-color: #000000 !important;
    color: #ffffff !important;
}

.promo-piece-glyph {
    font-size: 32px;
    line-height: 1;
    display: block;
    margin-bottom: 2px;
}

.promo-piece-name {
    font-size: 12px;
    font-weight: bold;
    display: block;
    line-height: 1.2;
}