/* ========================================
   Rebus Puzzle - Monochrome Minimal Design
   Pure black & white with DM Mono font
   ======================================== */

/* Google Fonts - DM Mono & Noto Emoji */
@import url('https://fonts.googleapis.com/css2?family=DM+Mono:wght@400;500&display=swap');
@import url('https://fonts.googleapis.com/css2?family=Noto+Emoji:wght@300..700&display=swap');

/* CSS Custom Properties */
:root {
    /* Monochrome Colors */
    --color-bg: #FFFFFF;
    --color-black: #1A1A1A;
    --color-white: #FFFFFF;
    --color-gray-light: #E5E5E5;
    --color-gray: #888888;
    --color-accent: #3B82F6;

    /* Typography */
    --font-mono: 'DM Mono', monospace;
    --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;

    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;

    /* Borders */
    --border-width: 2px;
    --radius-sm: 2px;
    --radius-md: 2px;
    --radius-pill: 50px;

    /* Transitions */
    --transition-fast: 100ms ease;
}

/* Reset & Base */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
}

body {
    font-family: var(--font-mono);
    background-color: var(--color-bg);
    color: var(--color-black);
    line-height: 1.5;
    min-height: 100vh;
    display: flex;
    -webkit-font-smoothing: antialiased;
}

/* Blue Left Accent Stripe */
.accent-stripe {
    width: 6px;
    background: var(--color-accent);
    flex-shrink: 0;
}

/* Main Container */
.container {
    flex: 1;
    max-width: 520px;
    margin: 0 auto;
    padding: var(--space-xl);
    display: flex;
    flex-direction: column;
    justify-content: center;
    min-height: 100vh;
}

/* Header */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 28px;
}

/* Logo - Stacked Pills */
.logo {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.logo-pill {
    background: var(--color-black);
    color: var(--color-white);
    padding: var(--space-xs) var(--space-md);
    border-radius: var(--radius-sm);
    font-size: 20px;
    font-weight: 500;
    letter-spacing: 0.05em;
    display: inline-block;
    width: fit-content;
}

.logo-link {
    text-decoration: none;
    color: inherit;
}

/* Coins Display */
.coins-display {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    background: var(--color-black);
    color: var(--color-white);
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-pill);
    font-size: var(--font-size-base);
    font-weight: 500;
}

.coin-icon {
    width: 20px;
    height: 20px;
    filter: invert(1);
}

.btn-coin-icon {
    width: 14px;
    height: 14px;
    vertical-align: middle;
    margin-left: 2px;
}

.reward-coin-icon {
    width: 18px;
    height: 18px;
    vertical-align: middle;
    filter: invert(1);
}

/* Game Area */
.game-area {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

/* Progress - Hidden in new design */
.progress {
    display: none;
}

/* Puzzle Card */
.puzzle-card {
    background: var(--color-white);
    border: 1px solid #D1D1D1;
    border-radius: var(--radius-md);
    padding: var(--space-2xl);
    text-align: center;
    min-height: 230px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.puzzle-content {
    font-size: 3rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    line-height: 1.4;
}

/* Text-based puzzle styling */
.puzzle-content .puzzle-emoji {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    white-space: pre-wrap;
}

.puzzle-content .puzzle-emoji big {
    font-size: 1.5em;
    font-weight: bold;
}

.puzzle-content .text-puzzle,
.puzzle-content .puzzle-emoji.text-puzzle {
    font-family: 'DM Mono', monospace !important;
    letter-spacing: 0.05em;
}

/* Hint Display */
.hint-display {
    margin-top: var(--space-lg);
    padding: var(--space-md);
    background: var(--color-gray-light);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-sm);
}

.hint-label {
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Answer Section */
.answer-section {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    align-items: center;
}

/* Letter Boxes */
.letter-boxes {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
    align-items: center;
    width: 100%;
    margin: 18px 0;
}

.letter-row {
    display: flex;
    gap: var(--space-xs);
    justify-content: center;
}

.letter-box {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-mono);
    font-size: var(--font-size-lg);
    font-weight: 500;
    text-transform: uppercase;
    border-radius: var(--radius-sm);
    background: #E8E8E8;
    border: 1px solid #D1D1D1;
    color: var(--color-black);
    transition: all var(--transition-fast);
}

.letter-box.filled {
    background: var(--color-black);
    border-color: var(--color-black);
    color: var(--color-white);
}

.letter-box.cursor {
    position: relative;
}

.letter-box.cursor::after {
    content: '';
    position: absolute;
    bottom: 8px;
    left: 50%;
    transform: translateX(-50%);
    width: 20px;
    height: 2px;
    background: var(--color-black);
    animation: blink 1s step-end infinite;
}

@keyframes blink {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0;
    }
}

.letter-box.space {
    background: transparent;
    width: 20px;
}

/* Hidden input for keyboard capture */
.hidden-input {
    position: absolute;
    opacity: 0;
    pointer-events: none;
}

/* Shake animation */
.answer-input.shake {
    animation: shake 0.4s ease;
    border-color: var(--color-black);
}

@keyframes shake {

    0%,
    100% {
        transform: translateX(0);
    }

    20%,
    60% {
        transform: translateX(-6px);
    }

    40%,
    80% {
        transform: translateX(6px);
    }
}

/* Buttons */
.btn {
    padding: var(--space-md) var(--space-xl);
    font-family: var(--font-mono);
    font-size: var(--font-size-sm);
    font-weight: 500;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    border: var(--border-width) solid var(--color-black);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
}

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

.btn-primary {
    background: var(--color-black);
    color: var(--color-white);
    width: 100%;
}

.btn-primary:hover {
    background: #333;
}

.btn-primary:disabled {
    background: var(--color-gray);
    border-color: var(--color-gray);
    cursor: not-allowed;
}

.btn-secondary {
    background: var(--color-white);
    color: var(--color-black);
    border-color: #E9E9E9;
    flex: 1;
}

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

.btn-secondary:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.btn .cost {
    font-weight: 400;
}

.btn-text {
    background: none;
    border: none;
    color: var(--color-gray);
    font-family: var(--font-mono);
    font-size: var(--font-size-xs);
    font-weight: 500;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    cursor: pointer;
    padding: var(--space-sm);
    transition: color var(--transition-fast);
}

.btn-text:hover {
    color: var(--color-black);
}

/* Full width button */
.full-width {
    width: 100%;
}

/* Action Buttons */
.action-buttons {
    display: flex;
    gap: var(--space-sm);
    justify-content: center;
    width: 100%;
}

/* Feedback */
.feedback {
    text-align: center;
    padding: var(--space-sm) var(--space-md);
    font-size: var(--font-size-sm);
    border-radius: var(--radius-sm);
    width: 100%;
}

.feedback.error {
    color: var(--color-black);
    background: var(--color-gray-light);
}

.feedback.info {
    color: var(--color-white);
    background: var(--color-black);
}

/* Success Overlay */
.success-overlay {
    position: fixed;
    inset: 0;
    background: rgba(255, 255, 255, 0.98);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
    opacity: 0;
    visibility: hidden;
    transition: opacity 200ms ease, visibility 200ms ease;
}

.success-overlay.visible {
    opacity: 1;
    visibility: visible;
}

.success-content {
    text-align: center;
    padding: var(--space-2xl);
    animation: fadeIn 0.2s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.success-icon {
    width: 80px;
    height: 80px;
    background: var(--color-black);
    color: var(--color-white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-2xl);
    margin: 0 auto var(--space-lg);
}

.success-content h2 {
    font-size: var(--font-size-xl);
    font-weight: 500;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    margin-bottom: var(--space-sm);
}

.reward {
    display: inline-block;
    background: var(--color-black);
    color: var(--color-white);
    padding: var(--space-xs) var(--space-md);
    border-radius: var(--radius-pill);
    font-size: var(--font-size-sm);
    margin-bottom: var(--space-md);
}

.answer-reveal {
    color: var(--color-gray);
    font-size: var(--font-size-sm);
    margin-bottom: var(--space-xl);
}

.stats {
    font-size: var(--font-size-base);
    margin-bottom: var(--space-sm);
}

/* Footer */
.footer {
    text-align: center;
    padding-top: var(--space-md);
}

/* Utility Classes */
.hidden {
    display: none !important;
}

/* Monochrome Emoji Styling (Google Noto Emoji) */
.puzzle-emoji {
    font-family: "Noto Emoji", "Segoe UI Emoji", sans-serif;
    font-optical-sizing: auto;
    font-weight: 400;
    font-style: normal;
    font-variant-emoji: text;
    -webkit-font-smoothing: antialiased;
    color: inherit;
}

/* Text-based puzzles use monospace font */
.puzzle-emoji.text-puzzle {
    font-family: var(--font-mono) !important;
    letter-spacing: 0.05em;
}

/* Responsive */
@media (max-width: 768px) {
    html {
        font-size: 15px;
    }

    .container {
        padding: var(--space-lg);
        max-width: 100%;
    }

    .header {
        margin-bottom: 20px;
    }

    .logo-pill {
        font-size: 18px;
        padding: 6px 14px;
    }

    .coins-display {
        padding: 6px 12px;
        font-size: 0.9rem;
    }

    .puzzle-card {
        padding: var(--space-xl);
        min-height: 180px;
    }

    .puzzle-content {
        font-size: 2.5rem;
        gap: 0.35rem;
    }

    .letter-box {
        width: 40px;
        height: 40px;
        font-size: 1rem;
    }

    .btn {
        padding: 12px 24px;
        font-size: 0.8rem;
    }

    .btn-primary {
        padding: 14px 28px;
    }

    .action-buttons {
        flex-direction: column;
        gap: 0.75rem;
    }

    .btn-secondary {
        width: 100%;
    }
}

@media (max-width: 480px) {
    html {
        font-size: 14px;
    }

    body {
        font-size: 0.95rem;
    }

    .container {
        padding: var(--space-md);
    }

    .header {
        margin-bottom: 16px;
        flex-wrap: wrap;
        gap: 0.5rem;
    }

    .logo-pill {
        font-size: 16px;
        padding: 5px 12px;
    }

    .coins-display {
        padding: 5px 10px;
        font-size: 0.85rem;
    }

    .coin-icon {
        width: 16px;
        height: 16px;
    }

    .puzzle-card {
        padding: var(--space-lg);
        min-height: 150px;
        border-radius: 4px;
    }

    .puzzle-content {
        font-size: 2rem;
        gap: 0.3rem;
    }

    .letter-boxes {
        margin: 14px 0;
        gap: 6px;
    }

    .letter-row {
        gap: 4px;
    }

    .letter-box {
        width: 36px;
        height: 36px;
        font-size: 0.95rem;
    }

    .letter-box.space {
        width: 16px;
    }

    .hint-display {
        font-size: 0.8rem;
        padding: 10px;
    }

    .btn {
        padding: 10px 20px;
        font-size: 0.75rem;
    }

    .btn-primary {
        padding: 12px 24px;
    }

    .action-buttons {
        gap: 0.5rem;
    }

    .feedback {
        font-size: 0.8rem;
        padding: 8px 12px;
    }

    .success-icon {
        width: 60px;
        height: 60px;
        font-size: 1.5rem;
    }

    .success-content h2 {
        font-size: 1.1rem;
    }

    .reward {
        font-size: 0.8rem;
        padding: 4px 12px;
    }

    .answer-reveal {
        font-size: 0.8rem;
    }

    .stats {
        font-size: 0.9rem;
    }

    .btn-text {
        font-size: 0.7rem;
    }
}

@media (max-width: 375px) {
    html {
        font-size: 13px;
    }

    .container {
        padding: 12px;
    }

    .logo-pill {
        font-size: 15px;
        padding: 4px 10px;
    }

    .puzzle-content {
        font-size: 1.75rem;
    }

    .letter-box {
        width: 32px;
        height: 32px;
        font-size: 0.9rem;
    }

    .puzzle-card {
        padding: var(--space-md);
        min-height: 130px;
    }
}

/* ========================================
   Get explanation for any puzzle page
   ======================================== */
.analyze-page .container {
    max-width: 520px;
}

.analyze-main {
    padding: 0 0 var(--space-2xl);
}

.analyze-hero {
    text-align: center;
    padding: 2rem 0;
}

.analyze-hero h1 {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.analyze-hero p {
    opacity: 0.85;
    font-size: var(--font-size-sm);
    margin-bottom: 1.5rem;
}

.analyze-upload-zone {
    border: 2px dashed var(--color-gray-light);
    border-radius: var(--radius-md);
    padding: 2rem;
    text-align: center;
    background: var(--color-bg);
    cursor: pointer;
    transition: border-color 0.2s, background 0.2s;
}

.analyze-upload-zone:hover,
.analyze-upload-zone.drag-over {
    border-color: var(--color-accent);
    background: rgba(59, 130, 246, 0.04);
}

.analyze-upload-zone input[type="file"] {
    display: none;
}

.analyze-upload-zone .upload-text {
    font-size: var(--font-size-sm);
    color: var(--color-gray);
}

.analyze-upload-zone .upload-hint {
    font-size: var(--font-size-xs);
    margin-top: 0.25rem;
    opacity: 0.7;
}

.analyze-loading {
    display: none;
    text-align: center;
    padding: 1.5rem;
}

.analyze-loading.visible {
    display: block;
}

.analyze-loading .spinner {
    width: 32px;
    height: 32px;
    border: 3px solid var(--color-gray-light);
    border-top-color: var(--color-accent);
    border-radius: 50%;
    animation: analyze-spin 0.8s linear infinite;
    margin: 0 auto 0.75rem;
}

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

.analyze-result {
    display: none;
    margin-top: 1.5rem;
    text-align: left;
}

.analyze-result.visible {
    display: block;
}

.analyze-result h2 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.analyze-result .explanation {
    margin-bottom: 1.25rem;
    font-size: var(--font-size-sm);
    line-height: 1.6;
}

.analyze-result .answers-list {
    list-style: none;
}

.analyze-result .answers-list li {
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--color-gray-light);
    font-size: var(--font-size-sm);
}

.analyze-result .answers-list li:last-child {
    border-bottom: none;
}

.analyze-error {
    display: none;
    margin-top: 1rem;
    padding: 1rem;
    background: #FEE2E2;
    color: #991B1B;
    border-radius: var(--radius-sm);
    font-size: var(--font-size-sm);
}

.analyze-error.visible {
    display: block;
}

.analyze-back {
    display: inline-block;
    margin-bottom: 1rem;
    font-size: var(--font-size-sm);
    color: var(--color-accent);
    text-decoration: none;
}

.analyze-back:hover {
    text-decoration: underline;
}

/* Header link to analyze page (e.g. on puzzles.html) */
.analyze-nav-link {
    font-size: var(--font-size-sm);
    color: var(--color-accent);
    text-decoration: none;
}

.analyze-nav-link:hover {
    text-decoration: underline;
}