/* ===== CSS VARIABLES - DESIGN SYSTEM ===== */
:root {
    /* Colors - Light Mode */
    --color-bg: #ffffff;
    --color-surface: #f8f9fa;
    --color-border: #e0e0e0;
    --color-text-primary: #1a1a1a;
    --color-text-secondary: #6e6e6e;
    --color-text-tertiary: #9e9e9e;
    
    /* Game Colors */
    --color-correct: #6aaa64;
    --color-incorrect: #dc3545;
    --color-hint: #ffc107;
    --color-primary: #6aaa64;
    --color-primary-hover: #5a9454;
    
    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    
    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    
    /* Animations */
    --timing-fast: 150ms;
    --timing-base: 250ms;
    --timing-slow: 350ms;
    --ease-smooth: cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.15);
    
    /* Z-index */
    --z-modal: 1000;
    --z-toast: 1100;
    --z-overlay: 999;
}

/* Dark Mode Variables */
[data-theme="dark"] {
    --color-bg: #121212;
    --color-surface: #1e1e1e;
    --color-border: #3a3a3a;
    --color-text-primary: #e0e0e0;
    --color-text-secondary: #a0a0a0;
    --color-text-tertiary: #707070;
}

/* ===== RESET & BASE STYLES ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
}

body {
    font-family: var(--font-family);
    background-color: var(--color-bg);
    color: var(--color-text-primary);
    line-height: 1.6;
    transition: background-color var(--timing-base) var(--ease-smooth),
                color var(--timing-base) var(--ease-smooth);
    overflow-x: hidden;
}

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

/* ===== HEADER ===== */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 1px solid var(--color-border);
    width: 100%;
    max-width: 100%;
}

.header-left,
.header-right {
    display: flex;
    gap: var(--spacing-sm);
    flex: 1;
}

.header-right {
    justify-content: flex-end;
}

.title {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    letter-spacing: -0.02em;
    text-align: center;
    flex: 1;
}

.icon-btn {
    background: none;
    border: none;
    color: var(--color-text-primary);
    cursor: pointer;
    padding: var(--spacing-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    transition: background-color var(--timing-fast) var(--ease-smooth),
                transform var(--timing-fast) var(--ease-smooth);
}

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

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

.icon-btn:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

.icon-btn svg {
    width: 24px;
    height: 24px;
}

/* ===== MODE SELECTOR ===== */
.mode-selector {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    margin-bottom: var(--spacing-sm);
    width: 100%;
}

.mode-btn {
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-text-secondary);
    background-color: transparent;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--timing-fast) var(--ease-smooth);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

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

.mode-btn-active {
    background-color: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
}

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

.mode-btn:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* ===== MAIN GAME CONTAINER ===== */
.game-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    width: 100%;
    max-width: 520px;
    margin: 0 auto;
    padding: 0 var(--spacing-sm) var(--spacing-sm) var(--spacing-sm);
    min-height: calc(100vh - 80px);
}

/* ===== LOADING STATE ===== */
.loading-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-lg);
    padding: var(--spacing-2xl);
}

.spinner {
    width: 48px;
    height: 48px;
    border: 4px solid var(--color-border);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ===== GAME CONTENT ===== */
.game-content {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    align-items: center;
}

/* ===== PRODUCT SECTION ===== */
.product-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
    text-align: center;
    width: 100%;
    max-width: 320px;
    margin: 0 auto;
    padding: 0 var(--spacing-xs) var(--spacing-xs) var(--spacing-xs);
    background-color: var(--color-surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

.product-image-container {
    width: 100%;
    max-width: 240px;
    aspect-ratio: 1;
    background-color: var(--color-bg);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.product-image {
    width: 100%;
    height: 100%;
    object-fit: contain;
    padding: var(--spacing-lg);
}

.product-name {
    font-size: var(--font-size-base);
    font-weight: 700;
    color: var(--color-text-primary);
    margin: 0;
    line-height: 1.3;
}

.product-location {
    font-size: var(--font-size-xs);
    color: var(--color-text-secondary);
    margin: 0;
    line-height: 1.3;
}

.product-date {
    font-size: var(--font-size-xs);
    color: var(--color-text-tertiary);
    margin: 0;
}

/* ===== ATTEMPTS COUNTER ===== */
.attempts-counter {
    text-align: center;
    font-size: var(--font-size-sm);
    color: var(--color-text-primary);
    font-weight: 600;
    margin: 0;
    padding: var(--spacing-sm);
    width: 100%;
}

#currentAttempt {
    color: var(--color-text-primary);
    font-weight: 700;
}

/* ===== GUESSES SECTION ===== */
.guesses-section {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    width: 100%;
    max-width: 400px;
    margin: 0 auto;
}

.guess-container {
    background-color: var(--color-surface);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-xs);
    font-size: var(--font-size-xs);
    font-weight: 600;
    text-align: center;
    min-height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--timing-base) var(--ease-smooth);
    opacity: 1;
    color: var(--color-text-tertiary);
}

.guess-container::before {
    content: '—';
}

.guess-container:not(:empty) {
    animation: slideUp var(--timing-base) var(--ease-smooth);
    color: inherit;
}

.guess-container:not(:empty)::before {
    content: '';
}

.guess-container.shake {
    animation: shake var(--timing-base) var(--ease-smooth);
}

/* ===== INPUT SECTION ===== */
.input-section {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    width: 100%;
    max-width: 400px;
    margin: 0 auto;
    margin-top: var(--spacing-sm);
}

.input-group {
    display: flex;
    gap: var(--spacing-sm);
    width: 100%;
}

.share-group {
    display: flex;
    gap: var(--spacing-sm);
    width: 100%;
}

#inputField {
    flex: 1;
    padding: var(--spacing-sm);
    font-size: var(--font-size-sm);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    background-color: var(--color-bg);
    color: var(--color-text-primary);
    font-family: var(--font-family);
    transition: border-color var(--timing-fast) var(--ease-smooth);
}

#inputField::placeholder {
    color: var(--color-text-tertiary);
}

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

#inputField:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.submit-btn {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-xs);
    font-weight: 700;
    color: white;
    background-color: var(--color-incorrect);
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: background-color var(--timing-fast) var(--ease-smooth),
                transform var(--timing-fast) var(--ease-smooth);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.submit-btn:hover:not(:disabled) {
    background-color: #c22a3c;
}

.submit-btn:active:not(:disabled) {
    transform: scale(0.98);
}

.submit-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.submit-btn:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

.input-hint {
    font-size: var(--font-size-xs);
    color: var(--color-text-tertiary);
    text-align: center;
    margin: 0;
    display: none;
}

/* ===== VICTORY/DEFEAT INLINE ===== */
.victory-inline,
.defeat-inline {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    width: 100%;
    text-align: center;
    padding: var(--spacing-sm);
}

.victory-inline-title,
.defeat-inline-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-text-primary);
    margin: 0;
}

.victory-inline-price,
.defeat-inline-price {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    margin: 0;
}

.share-group .share-btn {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-xs);
    font-weight: 700;
    color: white;
    background-color: var(--color-incorrect);
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: background-color var(--timing-fast) var(--ease-smooth),
                transform var(--timing-fast) var(--ease-smooth);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    display: flex;
    align-items: center;
    justify-content: center;
}

.share-group .share-btn:hover {
    background-color: #c22a3c;
}

.share-group .share-btn:active {
    transform: scale(0.98);
}

.share-group .share-btn:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

.share-group .new-product-btn {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-xs);
    font-weight: 700;
    color: white;
    background-color: var(--color-primary);
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: background-color var(--timing-fast) var(--ease-smooth),
                transform var(--timing-fast) var(--ease-smooth);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    display: flex;
    align-items: center;
    justify-content: center;
}

.share-group .new-product-btn:hover {
    background-color: #578a50;
}

.share-group .new-product-btn:active {
    transform: scale(0.98);
}


.victory-section,
.defeat-section {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    width: 100%;
    max-width: 400px;
    margin: 0 auto;
    text-align: center;
}

.victory-title,
.defeat-title {
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--color-text-primary);
    margin: 0;
}

.victory-message,
.defeat-message {
    font-size: var(--font-size-base);
    color: var(--color-text-primary);
    margin: 0;
}

.victory-price,
.defeat-encouragement {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    margin: 0;
}

/* ===== MODALS ===== */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: var(--z-modal);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md);
}

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.6);
    z-index: var(--z-overlay);
    animation: fadeIn var(--timing-base) var(--ease-smooth);
    backdrop-filter: blur(4px);
}

.modal-content {
    background-color: var(--color-bg);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    max-width: 500px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    position: relative;
    z-index: calc(var(--z-overlay) + 1);
    box-shadow: var(--shadow-lg);
    animation: slideUp var(--timing-slow) var(--ease-smooth);
}

.modal-close {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    background: none;
    border: none;
    font-size: var(--font-size-3xl);
    color: var(--color-text-secondary);
    cursor: pointer;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    transition: background-color var(--timing-fast) var(--ease-smooth),
                color var(--timing-fast) var(--ease-smooth);
    line-height: 1;
}

.modal-close:hover {
    background-color: var(--color-surface);
    color: var(--color-text-primary);
}

.modal-close:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

.modal-title {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    color: var(--color-text-primary);
}

/* ===== TUTORIAL MODAL ===== */
.tutorial-content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.tutorial-content p {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    line-height: 1.6;
}

.tutorial-examples {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.tutorial-example {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.tutorial-guess {
    opacity: 1 !important;
}

.tutorial-note {
    background-color: var(--color-surface);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    text-align: center;
}

.tutorial-note a {
    color: var(--color-correct);
    text-decoration: underline;
    font-weight: 600;
}

.tutorial-note a:hover {
    opacity: 0.8;
}

/* ===== VICTORY/DEFEAT MODALS ===== */
.victory-modal,
.defeat-modal {
    text-align: center;
}

.victory-message,
.defeat-message {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-lg);
}

.defeat-encouragement {
    font-size: var(--font-size-base);
    color: var(--color-text-tertiary);
    margin-bottom: var(--spacing-lg);
}

.modal-actions {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
}

.primary-btn,
.secondary-btn {
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: var(--font-size-base);
    font-weight: 600;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--timing-fast) var(--ease-smooth);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    border: none;
    font-family: var(--font-family);
}

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

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

.secondary-btn {
    background-color: var(--color-surface);
    color: var(--color-text-primary);
    border: 2px solid var(--color-border);
}

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

.primary-btn:focus-visible,
.secondary-btn:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

.countdown-section {
    background-color: var(--color-surface);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
}

.countdown-label {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xs);
}

.countdown-timer {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--color-primary);
    font-variant-numeric: tabular-nums;
}

/* Confetti Container */
.confetti-container {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    pointer-events: none;
    overflow: hidden;
    border-radius: var(--radius-xl);
}

/* ===== STATS MODAL ===== */
.stats-summary {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.stat-item {
    text-align: center;
}

.stat-value {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--color-primary);
}

.stat-label {
    font-size: var(--font-size-xs);
    color: var(--color-text-secondary);
    margin-top: var(--spacing-xs);
}

.distribution-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--color-text-primary);
}

.guess-distribution {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xl);
}

.distribution-row {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.distribution-label {
    font-weight: 600;
    color: var(--color-text-secondary);
    width: 20px;
    flex-shrink: 0;
}

.distribution-bar-container {
    flex: 1;
    height: 28px;
    background-color: var(--color-surface);
    border-radius: var(--radius-sm);
    overflow: hidden;
}

.distribution-bar {
    height: 100%;
    background-color: var(--color-primary);
    display: flex;
    align-items: center;
    justify-content: flex-end;
    padding-right: var(--spacing-sm);
    min-width: 28px;
    transition: width var(--timing-slow) var(--ease-smooth);
}

.distribution-bar.current-attempt {
    background-color: var(--color-primary);
    animation: pulse 1s ease-in-out;
}

.distribution-bar.fail-bar {
    background-color: var(--color-incorrect);
}

.distribution-count {
    color: white;
    font-size: var(--font-size-sm);
    font-weight: 600;
}

/* ===== TOAST ===== */
.toast {
    position: fixed;
    top: var(--spacing-xl);
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--color-text-primary);
    color: var(--color-bg);
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    font-weight: 500;
    box-shadow: var(--shadow-lg);
    z-index: var(--z-toast);
    animation: slideDown var(--timing-base) var(--ease-smooth);
}

.toast.hiding {
    animation: slideUp var(--timing-base) var(--ease-smooth);
}

/* ===== ANIMATIONS ===== */
@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes shake {
    0%, 100% {
        transform: translateX(0);
    }
    10%, 30%, 50%, 70%, 90% {
        transform: translateX(-8px);
    }
    20%, 40%, 60%, 80% {
        transform: translateX(8px);
    }
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
}

@keyframes bounce {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-10px);
    }
}

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

/* Mobile Small (< 375px) */
@media (max-width: 374px) {
    .title {
        font-size: var(--font-size-xl);
    }
    
    .header {
        padding: var(--spacing-sm) var(--spacing-md);
    }
    
    .game-container {
        padding: var(--spacing-md) var(--spacing-sm);
    }
    
    .product-image-container {
        max-width: 280px;
    }
    
    .stats-summary {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Mobile (375px - 767px) */
@media (min-width: 375px) and (max-width: 767px) {
    .product-image-container {
        max-width: 320px;
    }
    
    .modal-content {
        padding: var(--spacing-lg);
    }
}

/* Tablet (768px - 1023px) */
@media (min-width: 768px) {
    .game-container {
        padding: var(--spacing-xl) var(--spacing-lg);
    }
    
    .product-image-container {
        max-width: 400px;
    }
    
    .input-group {
        max-width: 400px;
        margin: 0 auto;
    }
}

/* Desktop (>= 1024px) */
@media (min-width: 1024px) {
    .game-container {
        padding: var(--spacing-2xl) var(--spacing-xl);
    }
    
    .modal-content {
        max-width: 600px;
    }
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* High Contrast Mode */
@media (prefers-contrast: high) {
    .guess-container {
        border-width: 3px;
    }
    
    .icon-btn:focus-visible,
    .primary-btn:focus-visible,
    .secondary-btn:focus-visible {
        outline-width: 3px;
    }
}