/* === RESET === */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html,
body {
    width: 100%;
    height: 100%;
    overflow: hidden;
}

body {
    background: #e8ead6;
    user-select: none;
}

::-webkit-scrollbar {
    display: none;
}

/* === CSS VARIABLES === */
:root {
    --panel-bg: rgba(240, 242, 230, 0.72);
    --text: #3a3a3a;
    --text-secondary: #7a7a6a;
    --toggle-track: #c8cab8;
    --border: rgba(0, 0, 0, 0.08);
    --btn-bg: rgba(0, 0, 0, 0.06);
    --btn-hover: rgba(0, 0, 0, 0.12);
    --input-bg: rgba(0, 0, 0, 0.04);
}

[data-theme="night"] {
    --panel-bg: rgba(18, 20, 38, 0.82);
    --text: #d0d0e8;
    --text-secondary: #8888aa;
    --toggle-track: #2e2e4a;
    --border: rgba(255, 255, 255, 0.08);
    --btn-bg: rgba(255, 255, 255, 0.06);
    --btn-hover: rgba(255, 255, 255, 0.12);
    --input-bg: rgba(255, 255, 255, 0.04);
}

/* === CANVAS === */
#gameCanvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    display: block;
    z-index: 0;
}

/* === SETTINGS BUTTON === */
#settingsBtn {
    position: fixed;
    bottom: 12px;
    right: 12px;
    width: 52px;
    height: 52px;
    border: none;
    background: none;
    cursor: pointer;
    opacity: 0.35;
    transition: opacity 0.35s ease;
    z-index: 10;
    padding: 12px;
    border-radius: 50%;
}

#settingsBtn:hover {
    opacity: 0.7;
}

#settingsBtn svg {
    width: 100%;
    height: 100%;
    display: block;
}

/* === SETTINGS PANEL === */
#settingsPanel {
    position: fixed;
    bottom: 64px;
    right: 20px;
    width: 240px;
    background: var(--panel-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-radius: 16px;
    border: 1px solid var(--border);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.12), 0 2px 8px rgba(0, 0, 0, 0.06);
    z-index: 20;
    opacity: 0;
    pointer-events: none;
    transform: translateY(10px) scale(0.97);
    transform-origin: bottom right;
    transition: opacity 0.2s ease, transform 0.2s ease;
    overflow: hidden;
}

#settingsPanel.open {
    opacity: 1;
    pointer-events: all;
    transform: translateY(0) scale(1);
}

/* === PANEL HEADER === */
.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 14px 16px 10px;
    border-bottom: 1px solid var(--border);
}

.panel-title {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--text-secondary);
}

#closeBtn {
    background: none;
    border: none;
    cursor: pointer;
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    color: var(--text-secondary);
    font-size: 16px;
    line-height: 1;
    transition: background 0.15s;
    padding: 0;
}

#closeBtn:hover {
    background: var(--btn-hover);
}

/* === PANEL BODY === */
.panel-body {
    padding: 10px 16px 14px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

/* === SECTION LABEL === */
.section-label {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    font-size: 10px;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text-secondary);
    margin-top: 2px;
}

/* === CONTROL ROWS === */
.control-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 10px;
}

.control-label {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    font-size: 12px;
    color: var(--text);
    flex-shrink: 0;
    min-width: 80px;
}

/* === RANGE SLIDER === */
input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 4px;
    border-radius: 2px;
    background: var(--toggle-track);
    outline: none;
    cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: #7ec8a4;
    cursor: pointer;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.15);
    transition: transform 0.1s;
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

/* Conway mode slider thumb — orange accent */
#conwayIntensitySlider::-webkit-slider-thumb {
    background: #e8a598;
}

/* === NUMBER INPUT === */
input[type="number"] {
    width: 64px;
    height: 26px;
    border: 1px solid var(--border);
    border-radius: 7px;
    background: var(--input-bg);
    color: var(--text);
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    font-size: 12px;
    text-align: center;
    outline: none;
    padding: 0 4px;
    flex-shrink: 0;
    -moz-appearance: textfield;
    appearance: textfield;
}

input[type="number"]::-webkit-inner-spin-button,
input[type="number"]::-webkit-outer-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

input[type="number"]:focus {
    border-color: rgba(126, 200, 164, 0.6);
    box-shadow: 0 0 0 2px rgba(126, 200, 164, 0.15);
}

/* === COLOR PICKER === */
.color-btn-wrap {
    position: relative;
    width: 28px;
    height: 28px;
    flex-shrink: 0;
}

.color-btn-wrap input[type="color"] {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    padding: 0;
    background: none;
    opacity: 0;
    z-index: 2;
}

.color-swatch {
    position: absolute;
    inset: 0;
    border-radius: 50%;
    border: 2px solid var(--border);
    pointer-events: none;
    z-index: 1;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    transition: border-color 0.15s;
}

.color-btn-wrap:hover .color-swatch {
    border-color: rgba(0, 0, 0, 0.2);
}

/* === TOGGLE === */
.toggle {
    width: 38px;
    height: 22px;
    border-radius: 11px;
    background: var(--toggle-track);
    position: relative;
    cursor: pointer;
    transition: background 0.25s;
    flex-shrink: 0;
}

.toggle.active {
    background: #7ec8a4;
}

.toggle.active-orange {
    background: #e8a598;
}

.toggle-thumb {
    position: absolute;
    top: 3px;
    left: 3px;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: white;
    transition: transform 0.25s cubic-bezier(0.34, 1.56, 0.64, 1);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.15);
}

.toggle.active .toggle-thumb,
.toggle.active-orange .toggle-thumb {
    transform: translateX(16px);
}

/* === DIVIDER === */
.divider {
    height: 1px;
    background: var(--border);
    margin: 2px 0;
}

/* === ACTION BUTTONS === */
.button-row {
    display: flex;
    gap: 8px;
}

.action-btn {
    flex: 1;
    height: 30px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--btn-bg);
    color: var(--text);
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    font-size: 12px;
    cursor: pointer;
    transition: background 0.15s, transform 0.1s;
}

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

.action-btn:active {
    transform: scale(0.97);
}

/* Conway controls — hidden unless mode is on */
#conwayControls {
    display: flex;
    flex-direction: column;
    gap: 10px;
    overflow: hidden;
    max-height: 0;
    opacity: 0;
    transition: max-height 0.3s ease, opacity 0.25s ease;
}

#conwayControls.visible {
    max-height: 120px;
    opacity: 1;
}

/* === MULTI-SNAKE CONTROLS === */

/* × remove button on each snake row */
.snake-remove-btn {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-size: 16px;
    line-height: 1;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
    flex-shrink: 0;
    transition: background 0.15s, color 0.15s;
}

.snake-remove-btn:hover {
    background: rgba(200, 80, 80, 0.15);
    color: #c85050;
}

/* Disabled Add Snake button */
.action-btn:disabled {
    opacity: 0.38;
    cursor: not-allowed;
    pointer-events: none;
}

.theme-slot-row {
    display: flex;
    justify-content: center;
    gap: 10px;
}

.theme-slot-btn {
    width: 30px;
    height: 30px;
    border-radius: 50%;
    border: 1px solid var(--border);
    background: var(--btn-bg);
    color: var(--text);
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    font-size: 12px;
    cursor: pointer;
    transition: background 0.15s, transform 0.1s, border-color 0.15s;
}

.theme-slot-btn:hover {
    background: var(--btn-hover);
}

.theme-slot-btn:active {
    transform: scale(0.95);
}

.theme-slot-btn.saved {
    border-color: #7ec8a4;
    box-shadow: 0 0 0 2px rgba(126, 200, 164, 0.2);
}

/* === PERSONALITY TAG === */
.personality-tag {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    font-size: 9px;
    opacity: 0.6;
    display: block;
    margin-top: -1px;
    color: var(--text-secondary);
}

.personality-tag:hover {
    opacity: 1;
    color: var(--text);
}

/* === PERSONALITY DROPDOWN === */
.personality-dropdown {
    position: absolute;
    top: 100%;
    left: 0;
    margin-top: 2px;
    background: var(--panel-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--border);
    border-radius: 8px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
    z-index: 30;
    min-width: 110px;
    overflow: hidden;
}

.personality-option {
    padding: 5px 10px;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    font-size: 11px;
    color: var(--text);
    cursor: pointer;
    white-space: nowrap;
    transition: background 0.12s;
}

.personality-option:hover {
    background: var(--btn-hover);
}

.personality-option.selected {
    background: var(--btn-bg);
    font-weight: 600;
}