* {
    box-sizing: border-box;
}

html,
body {
    margin: 0;
    padding: 0;
    min-height: 100%;
}

body {
    font-family: "Inter", sans-serif;
    background: #f4f5f7;
    color: #1f2933;
    line-height: 1.4;
}

button,
a,
input,
select {
    font-family: "Inter", sans-serif;
}

button {
    cursor: pointer;
}

a {
    text-decoration: none;
    color: inherit;
}


/* =========================================
   APP SHELL & HEADER
========================================= */

.app-shell {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.app-header {
    background: #ffffff;
    border-bottom: 1px solid #d9dde3;
    padding: 14px 20px;
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-container {
    width: min(900px, 94%);
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: center;/*space-between;*/
}

.brand {
    font-size: 1.25rem;
    font-weight: 700;
    color: #1f2933;
    letter-spacing: -0.02em;
}

.header-nav {
    display: flex;
    align-items: center;
    gap: 12px;
}

.nav-link {
    font-size: 0.9rem;
    font-weight: 600;
    color: #5b6573;
    padding: 6px 10px;
    border-radius: 6px;
    transition: background-color 160ms ease, color 160ms ease;
}

.nav-link:hover {
    background: #eef1f4;
    color: #1f2933;
}

.page-container {
    flex: 1;
    padding: 24px 0;
}


/* =========================================
   LANDING PAGE
========================================= */

.hero {
    width: min(760px, 90%);
    min-height: calc(100vh - 80px);
    margin: 0 auto;
    padding: 40px 20px;

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

    text-align: center;
}

.hero h1 {
    margin: 0 0 14px;

    font-size: clamp(2rem, 5vw, 3.4rem);
    font-weight: 700;
    letter-spacing: -0.03em;
}

.hero p {
    max-width: 540px;
    margin: 0;

    font-size: 1.05rem;
    color: #5b6573;
}

.hero-actions {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 18px;

    margin-top: 34px;
}


/* =========================================
   BUTTONS
========================================= */

.btn {
    min-width: 150px;
    min-height: 44px;

    padding: 10px 22px;

    border: 1px solid transparent;
    border-radius: 8px;

    font-size: 0.95rem;
    font-weight: 600;

    transition:
        transform 160ms ease,
        background-color 160ms ease,
        border-color 160ms ease,
        box-shadow 160ms ease;
}

.btn:hover {
    transform: translateY(-1px);
}

.btn:focus-visible {
    outline: 3px solid #9aa7b8;
    outline-offset: 3px;
}

.btn-primary {
    background: #243447;
    color: #ffffff;
}

.btn-primary:hover {
    background: #1b2836;
}

.btn-secondary {
    background: #ffffff;
    color: #243447;
    border-color: #c9ced6;
}

.btn-secondary:hover {
    background: #eef1f4;
}

.btn-block {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    text-align: center;
}

.btn:disabled {
    cursor: not-allowed;
    opacity: 0.55;
    transform: none;
}


/* =========================================
   SETTINGS PAGE
========================================= */

.settings-container {
    width: min(600px, 92%);
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.settings-container .app-title {
    margin: 0 0 10px;
    font-size: 1.75rem;
    font-weight: 700;
    text-align: center;
    color: #1f2933;
}

.card {
    background: #ffffff;
    border: 1px solid #d9dde3;
    border-radius: 10px;
    padding: 20px 24px;
    box-shadow: 0 1px 3px rgba(31, 41, 51, 0.04);
}

.card-title {
    margin: 0 0 12px;
    font-size: 1.1rem;
    font-weight: 700;
    color: #293442;
}

.card-description {
    margin: 0 0 10px;
    color: #5b6573;
    font-size: 0.92rem;
    line-height: 1.5;
}

.card-description:last-child {
    margin-bottom: 0;
}

fieldset {
    border: none;
    padding: 0;
    margin: 0;
}

.settings-label {
    display: block;
    margin-bottom: 12px;
    font-size: 0.82rem;
    font-weight: 600;
    color: #687383;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.option-group {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.option-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 12px 14px;
    border: 1px solid #e2e5e9;
    border-radius: 8px;
    background: #f9fafb;
    cursor: pointer;
    transition: background-color 160ms ease, border-color 160ms ease;
}

.option-item:hover {
    background: #f0f2f5;
    border-color: #cbd2d9;
}

.option-item input[type="radio"] {
    margin-top: 3px;
    cursor: pointer;
    accent-color: #243447;
}

.option-item label {
    cursor: pointer;
    font-size: 0.95rem;
    color: #1f2933;
    width: 100%;
}


/* =========================================
   GAME LAYOUT
========================================= */

.game-layout {
    width: min(900px, 94%);
    min-height: calc(100vh - 120px);

    margin: 0 auto;
    padding: 18px 0 24px;

    display: flex;
    flex-direction: column;
}


/* =========================================
   GAME STATUS
========================================= */

.status-bar {
    width: min(560px, 100%);
    margin: 0 auto 18px;

    display: grid;
    grid-template-columns: repeat(3, 1fr);

    border: 1px solid #d9dde3;
    border-radius: 9px;

    background: #ffffff;

    flex-shrink: 0;
}

.status-item {
    min-width: 0;

    padding: 8px 10px;

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

    text-align: center;
}

.status-item + .status-item {
    border-left: 1px solid #e2e5e9;
}

.status-label {
    margin-bottom: 1px;

    color: #687383;

    font-size: 0.68rem;
    font-weight: 600;

    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.status-value {
    font-size: 1rem;
    font-weight: 700;
}


/* =========================================
   TIMER STATES
========================================= */

.status-item.timer-warning .status-value {
    animation: timerPulse 900ms ease-in-out infinite;
}

.status-item.timer-critical .status-value {
    animation: timerCritical 500ms ease-in-out infinite;
}

@keyframes timerPulse {
    0%,
    100% {
        transform: scale(1);
    }

    50% {
        transform: scale(1.08);
    }
}

@keyframes timerCritical {
    0%,
    100% {
        transform: scale(1);
    }

    50% {
        transform: scale(1.16);
    }
}


/* =========================================
   COLOR COMPARISON
========================================= */

.comparison-section {
    width: min(700px, 100%);
    margin: 0 auto;

    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;

    align-items: start;

    flex-shrink: 0;
}

.comparison-card {
    min-width: 0;

    padding: 12px 16px 14px;

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

    text-align: center;

    background: #ffffff;
    border: 1px solid #d9dde3;
    border-radius: 9px;
}

.section-title {
    margin: 0 0 9px;

    color: #293442;

    font-size: 0.76rem;
    font-weight: 700;

    letter-spacing: 0.04em;
    text-transform: uppercase;
}

.target-color,
.selection-preview {
    width: 145px;
    height: 145px;

    flex-shrink: 0;

    border-radius: 7px;
    border: 1px solid rgba(31, 41, 51, 0.14);

    background: #e5e7eb;
}

.selection-preview {
    transition:
        transform 180ms ease,
        box-shadow 180ms ease;
}

.selection-preview.has-selection {
    transform: scale(1.02);

    box-shadow:
        0 0 0 3px #d9dde3;
}

.selection-status {
    min-height: 18px;

    margin-top: 5px;

    color: #687383;

    font-size: 0.75rem;
}

.selection-status.selected {
    color: #293442;
    font-weight: 600;
}


/* =========================================
   PALETTE
========================================= */

.palette-section {
    width: min(700px, 100%);
    margin: 16px auto 0;

    text-align: center;

    flex-shrink: 0;
}

.palette-section .section-title {
    margin-bottom: 8px;
}

.palette-wrapper {
    width: 100%;
}

.palette-container {
    position: relative;

    width: 100%;
    max-width: 700px;
    height: 250px;

    margin: 0 auto;

    overflow: hidden;

    border: 1px solid #cfd5dc;
    border-radius: 9px;

    background: #ffffff;

    box-shadow:
        0 2px 7px rgba(31, 41, 51, 0.06);
}

.palette-canvas {
    display: block;

    width: 100%;
    height: 250px;

    cursor: crosshair;
}

.palette-canvas:focus-visible {
    outline: 3px solid #9aa7b8;
    outline-offset: -3px;
}


/* =========================================
   PALETTE SELECTION MARKER
========================================= */

.palette-selection-marker {
    position: absolute;

    width: 17px;
    height: 17px;

    display: none;

    border: 3px solid #ffffff;
    border-radius: 50%;

    box-shadow:
        0 0 0 2px rgba(31, 41, 51, 0.65),
        0 2px 5px rgba(31, 41, 51, 0.25);

    pointer-events: none;

    transform: translate(-50%, -50%);

    transition:
        left 120ms ease,
        top 120ms ease;
}

.palette-selection-marker.visible {
    display: block;

    animation: markerAppear 160ms ease-out;
}

@keyframes markerAppear {
    from {
        opacity: 0;

        transform:
            translate(-50%, -50%)
            scale(0.65);
    }

    to {
        opacity: 1;

        transform:
            translate(-50%, -50%)
            scale(1);
    }
}


/* =========================================
   GAME ACTIONS
========================================= */

.game-actions {
    margin: 14px auto 0;

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

    gap: 14px;

    flex-shrink: 0;
}


/* =========================================
   ROUND RESULT
========================================= */

.round-result {
    width: min(500px, 100%);

    margin: 14px auto 0;
    padding: 14px 18px;

    text-align: center;

    background: #ffffff;
    border: 1px solid #d9dde3;
    border-radius: 9px;

    opacity: 0;

    transform: translateY(8px);

    pointer-events: none;

    transition:
        opacity 220ms ease,
        transform 220ms ease;
}

.round-result.visible {
    opacity: 1;

    transform: translateY(0);
}

.round-result-content {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.round-result-label {
    margin-bottom: 3px;

    color: #687383;

    font-size: 0.7rem;
    font-weight: 700;

    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.round-result-accuracy {
    font-size: 1.8rem;
    line-height: 1.1;
}

.round-result-message {
    margin-top: 3px;

    color: #5b6573;

    font-size: 0.82rem;
}


/* =========================================
   MODALS
========================================= */

.modal-overlay {
    position: fixed;
    inset: 0;

    z-index: 1000;

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

    padding: 20px;

    background: rgba(20, 27, 36, 0.52);

    opacity: 0;
    visibility: hidden;

    pointer-events: none;

    transition:
        opacity 180ms ease,
        visibility 180ms ease;
}

.modal-overlay.active {
    opacity: 1;

    visibility: visible;

    pointer-events: auto;
}

.modal {
    width: min(520px, 100%);
    max-height: 90vh;

    overflow-y: auto;

    padding: 26px;

    background: #ffffff;

    border: 1px solid #d9dde3;
    border-radius: 11px;

    box-shadow:
        0 16px 45px rgba(20, 27, 36, 0.18);

    transform:
        translateY(12px)
        scale(0.98);

    transition:
        transform 180ms ease;
}

.modal-overlay.active .modal {
    transform:
        translateY(0)
        scale(1);
}

.modal-title {
    margin: 0 0 18px;

    color: #293442;

    font-size: 1.25rem;
    font-weight: 700;

    text-align: center;
}

.modal-content {
    text-align: center;
}

.text-muted {
    color: #687383;

    text-align: center;
}


/* =========================================
   RESULT STATISTICS
========================================= */

.result-stats {
    display: grid;
    gap: 8px;
}

.result-stat {
    display: flex;
    align-items: center;
    justify-content: space-between;

    padding: 9px 12px;

    background: #f4f5f7;

    border-radius: 7px;
}

.result-stat span {
    color: #5b6573;

    font-size: 0.85rem;
}

.result-stat strong {
    color: #293442;

    font-size: 0.95rem;
}

.modal-actions {
    margin-top: 20px;

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

    gap: 12px;
}


/* =========================================
   RESULT COLORS
========================================= */

.result-colors {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;

    margin-bottom: 16px;
}

.result-color-item {
    display: flex;
    flex-direction: column;
    align-items: center;

    gap: 6px;

    color: #687383;

    font-size: 0.76rem;
}

.result-color {
    width: 90px;
    height: 90px;

    border: 1px solid rgba(31, 41, 51, 0.14);

    border-radius: 7px;
}

.round-feedback {
    margin-top: 10px;

    font-weight: 600;
}

.time-up-modal {
    text-align: center;
}

.time-up-modal .modal-title {
    margin-bottom: 8px;
}


/* =========================================
   GAME COMPLETE
========================================= */

.game-complete-modal {
    width: min(600px, 100%);
}

.performance-summary {
    display: flex;
    flex-direction: column;
    align-items: center;

    margin-bottom: 14px;

    text-align: center;
}

.performance-label {
    color: #687383;

    font-size: 0.72rem;
    font-weight: 700;

    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.performance-message {
    margin-top: 3px;

    font-size: 1.05rem;
}

.final-accuracy {
    margin-top: 7px;

    font-size: 2.5rem;
    line-height: 1;
}


/* =========================================
   PERFORMANCE BAR
========================================= */

.performance-bar {
    width: 100%;
    height: 8px;

    margin-bottom: 20px;

    overflow: hidden;

    background: #e3e6ea;

    border-radius: 999px;
}

.performance-bar-fill {
    width: 0;
    height: 100%;

    border-radius: inherit;

    background: #293442;

    transition:
        width 700ms ease;
}


/* =========================================
   COLOR PERCEPTION
========================================= */

.color-performance {
    margin-top: 22px;
    padding-top: 20px;

    border-top: 1px solid #e1e4e8;
}

.color-performance .section-title {
    text-align: center;
}

.perception-highlight {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;

    margin-bottom: 15px;
}

.perception-result {
    padding: 11px;

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

    text-align: center;

    background: #f4f5f7;

    border-radius: 8px;
}

.perception-label {
    color: #687383;

    font-size: 0.68rem;
    font-weight: 700;

    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.perception-value {
    margin-top: 3px;

    font-size: 0.95rem;
}

.perception-score {
    margin-top: 1px;

    color: #5b6573;

    font-size: 0.8rem;
}

.color-performance-list {
    display: flex;
    flex-direction: column;

    gap: 7px;
}

.color-performance-row {
    display: grid;

    grid-template-columns:
        70px
        1fr
        45px;

    align-items: center;

    gap: 9px;

    font-size: 0.78rem;
}

.color-performance-name {
    color: #4e5968;
}

.color-performance-bar {
    height: 6px;

    overflow: hidden;

    background: #e3e6ea;

    border-radius: 999px;
}

.color-performance-fill {
    height: 100%;

    background: #293442;

    border-radius: inherit;

    transition:
        width 500ms ease;
}

.color-performance-score {
    text-align: right;

    font-weight: 600;
}


/* =========================================
   TRANSITION ANIMATION
========================================= */

.game-layout.round-transition {
    animation:
        roundTransition
        450ms ease;
}

@keyframes roundTransition {
    0% {
        opacity: 1;

        transform:
            scale(1);
    }

    40% {
        opacity: 0.45;

        transform:
            scale(0.985);
    }

    100% {
        opacity: 1;

        transform:
            scale(1);
    }
}

.timer-expired {
    animation:
        timerExpired
        500ms ease;
}

@keyframes timerExpired {
    0% {
        transform: scale(1);
        opacity: 1;
    }

    35% {
        transform: scale(1.15);
        opacity: 0.65;
    }

    70% {
        transform: scale(0.95);
        opacity: 0.85;
    }

    100% {
        transform: scale(1);
        opacity: 1;
    }
}


/* =========================================
   RESPONSIVE
========================================= */

@media (max-width: 700px) {

    .hero {
        min-height: calc(100vh - 80px);
        padding: 40px 18px;
    }

    .hero-actions {
        width: 100%;

        flex-direction: column;

        gap: 12px;

        margin-top: 28px;
    }

    .hero-actions .btn {
        width: min(280px, 100%);
    }

    .game-layout {
        width: 94%;
        min-height: auto;

        padding-top: 14px;
        padding-bottom: 24px;
    }

    .comparison-section {
        grid-template-columns: 1fr;
        gap: 10px;
    }

    .comparison-card {
        padding: 10px 14px;
    }

    .target-color,
    .selection-preview {
        width: 125px;
        height: 125px;
    }

    .palette-section {
        margin-top: 13px;
    }

    .palette-container,
    .palette-canvas {
        height: 260px;
    }

    .game-actions {
        flex-direction: column;

        margin-top: 12px;
    }

    .game-actions .btn {
        width: min(280px, 100%);
    }

    .modal {
        padding: 22px 18px;
    }

    .modal-actions {
        flex-direction: column;
    }

    .modal-actions .btn {
        width: min(280px, 100%);
    }

    .perception-highlight {
        grid-template-columns: 1fr;
    }

    .color-performance-row {
        grid-template-columns:
            65px
            1fr
            42px;

        gap: 7px;
    }
}


/* =========================================
   SMALL MOBILE
========================================= */

@media (max-width: 450px) {

    .status-bar {
        width: 100%;
    }

    .status-item {
        padding: 7px 6px;
    }

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

    .status-value {
        font-size: 0.92rem;
    }

    .target-color,
    .selection-preview {
        width: 110px;
        height: 110px;
    }

    .palette-container,
    .palette-canvas {
        height: 230px;
    }

    .result-colors {
        gap: 8px;
    }

    .result-color {
        width: 75px;
        height: 75px;
    }
}


/* =========================================
   SHORT DESKTOP VIEWPORT
========================================= */

@media (min-width: 701px) and (max-height: 800px) {

    .game-layout {
        padding-top: 10px;
        padding-bottom: 14px;
    }

    .status-bar {
        margin-bottom: 12px;
    }

    .comparison-card {
        padding: 9px 14px 10px;
    }

    .target-color,
    .selection-preview {
        width: 120px;
        height: 120px;
    }

    .palette-section {
        margin-top: 11px;
    }

    .palette-container,
    .palette-canvas {
        height: 210px;
    }

    .game-actions {
        margin-top: 10px;
    }

    .btn {
        min-height: 40px;
        padding: 8px 20px;
    }
}


/* =========================================
   ACCESSIBILITY
========================================= */

@media (prefers-reduced-motion: reduce) {

    *,
    *::before,
    *::after {
        scroll-behavior: auto !important;

        animation-duration: 0.01ms !important;

        animation-iteration-count: 1 !important;

        transition-duration: 0.01ms !important;
    }
}


/* =========================================
   THEMING & FONT SCALING
========================================= */

[data-theme="dark"] body {
    background: #121824;
    color: #f4f5f7;
}

[data-theme="dark"] .app-header,
[data-theme="dark"] .comparison-card,
[data-theme="dark"] .status-bar,
[data-theme="dark"] .palette-container,
[data-theme="dark"] .modal,
[data-theme="dark"] .card {
    background: #1e293b;
    border-color: #334155;
    color: #f4f5f7;
}

[data-theme="dark"] .brand,
[data-theme="dark"] .card-title,
[data-theme="dark"] .settings-container .app-title,
[data-theme="dark"] .option-item label {
    color: #f4f5f7;
}

[data-theme="dark"] .card-description,
[data-theme="dark"] .settings-label,
[data-theme="dark"] .text-muted,
[data-theme="dark"] .nav-link {
    color: #94a3b8;
}

[data-theme="dark"] .option-item {
    background: #0f172a;
    border-color: #334155;
}

[data-theme="dark"] .option-item:hover {
    background: #1e293b;
    border-color: #475569;
}

[data-theme="dark"] .btn-secondary {
    background: #1e293b;
    color: #f4f5f7;
    border-color: #334155;
}

[data-theme="dark"] .btn-secondary:hover {
    background: #334155;
}

[data-font-size="small"] { font-size: 14px; }
[data-font-size="medium"] { font-size: 16px; }
[data-font-size="large"] { font-size: 18px; }