@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;600;700;800&display=swap');

:root {
    --primary-color: #FFC800;
    --primary-hover: #EBB800;
    --secondary-color: #58CC02;
    --accent-color: #FFC800;
    --text-color: #4B4B4B;
    --light-gray: #E5E5E5;
    --white: #FFFFFF;
    --bg-color: #F7F7F7;
    --card-bg: #FFFFFF;
    --border-width: 2px;
    --shadow-color: #E5E5E5;
    --nav-bg: #FFFFFF;
    --input-bg: #FFFFFF;
}

[data-theme="dark"] {
    --text-color: #E5E5E5;
    --light-gray: #3F3F3F;
    --white: #1F1F1F;
    --bg-color: #121212;
    --card-bg: #1A1A1A;
    --shadow-color: #000000;
    --nav-bg: #1A1A1A;
    --input-bg: #2D2D2D;
    --review-bg-1: #1A2633;
    --review-bg-2: #161616;
    --review-border: #1CB0F6;
    --review-shadow: #000000;
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

html,
body {
    height: 100%;
    margin: 0;
    padding: 0;
    width: 100%;
    overflow-x: hidden;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    margin: 0;
    color: var(--text-color);
    transition: background-color 0.3s, color 0.3s;
}

/* Dashboard Layout */
.container {
    max-width: 1050px;
    margin: 0 auto;
    padding: 2rem;
    width: 100%;
}

@media (max-width: 600px) {
    .container {
        padding: 1rem;
    }
}

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
    border-bottom: 2px solid var(--light-gray);
    margin-bottom: 2rem;
    gap: 1rem;
    width: 100%;
    flex-wrap: wrap;
    /* Ensure header doesn't push width */
}

@media (max-width: 600px) {
    .header {
        flex-direction: column;
        gap: 1.5rem;
        text-align: center;
    }

    .user-stats-header {
        flex-wrap: wrap;
        justify-content: center;
        gap: 0.5rem;
    }
}

.logo {
    display: flex;
    align-items: center;
    font-weight: 800;
    font-size: 1.5rem;
    color: var(--primary-hover);
    letter-spacing: -1px;
}

.logo-img {
    height: 40px;
    vertical-align: middle;
    margin-right: 10px;
}

.stats {
    display: flex;
    gap: 1.5rem;
    font-weight: 700;
    font-size: 1.1rem;
}

.stats span {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.user-stats-header {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.streak-badge {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    font-weight: 800;
    color: #FF9600;
    font-size: 1.2rem;
    background: #FFF5E5;
    padding: 0.4rem 0.8rem;
    border-radius: 12px;
}

.xp-progress-container {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 0.2rem;
}

.xp-bar-bg {
    width: 120px;
    height: 10px;
    background: var(--light-gray);
    border-radius: 5px;
    overflow: hidden;
}

.xp-bar-fill {
    height: 100%;
    background: var(--secondary-color);
    transition: width 0.5s ease;
}

.xp-text {
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--secondary-color);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.dashboard-grid {
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: 2rem;
    align-items: start;
}

@media (max-width: 768px) {
    .dashboard-grid {
        grid-template-columns: 1fr;
    }

    .sidebar {
        position: static;
        order: 2;
    }

    .main-content {
        order: 1;
    }
}

.sidebar {
    position: sticky;
    top: 2rem;
}

.leaderboard-card {
    background: var(--card-bg);
    border: 2px solid var(--light-gray);
    border-radius: 20px;
    padding: 1.5rem;
    box-shadow: 0 4px 0 var(--shadow-color);
}

.leaderboard-card h3 {
    margin: 0 0 1rem;
    font-size: 1.2rem;
}

.leaderboard-item {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    padding: 0.8rem 0;
    border-bottom: 1px solid var(--light-gray);
}

.leaderboard-item:last-child {
    border-bottom: none;
}

.rank {
    font-weight: 800;
    color: #afafaf;
    width: 20px;
}

.loading-text {
    color: #afafaf;
    font-size: 0.9rem;
}

.leader-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
}

.leader-name {
    font-weight: 600;
    flex-grow: 1;
    font-size: 0.95rem;
}

.leader-xp {
    font-weight: 800;
    color: var(--secondary-color);
    font-size: 0.9rem;
}

/* Smart Review Card */
.review-card {
    background: linear-gradient(135deg, #EAFBFF 0%, #FFFFFF 100%);
    border: 2px solid #1CB0F6;
    border-radius: 20px;
    padding: 1.5rem;
    box-shadow: 0 8px 0 #E0F7FF;
    margin-bottom: 2rem;
    transition: transform 0.2s, box-shadow 0.2s;
    position: relative;
    overflow: hidden;
}

[data-theme="dark"] .review-card {
    background: linear-gradient(135deg, #1A2634 0%, #1A1A1A 100%);
    border-color: #1899D6;
    box-shadow: 0 8px 0 #000000;
}

.review-card:hover {
    box-shadow: 0 8px 0 #E0F7FF;
}

[data-theme="dark"] .review-card:hover {
    box-shadow: 0 8px 0 #000000;
}

.review-card::after {
    content: '🧠';
    position: absolute;
    right: -10px;
    bottom: -10px;
    font-size: 4rem;
    opacity: 0.1;
    transform: rotate(-15deg);
}

.review-title {
    margin: 0 0 0.5rem;
    color: #1CB0F6;
    font-weight: 800;
    font-size: 1.25rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.review-text {
    font-size: 0.95rem;
    color: #4B4B4B;
    margin-bottom: 1.2rem;
    line-height: 1.4;
}

.review-btn {
    display: block;
    background: #1CB0F6;
    color: white;
    text-align: center;
    text-decoration: none;
    padding: 0.8rem;
    border-radius: 12px;
    font-weight: 800;
    box-shadow: 0 4px 0 #1899D6;
    transition: all 0.1s;
}

.review-btn:hover {
    filter: brightness(1.1);
}

.review-btn:active {
    transform: translateY(2px);
    box-shadow: 0 2px 0 #1899D6;
}

.user-profile {
    display: flex;
    align-items: center;
    gap: 0.8rem;
}

.user-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: 2px solid var(--primary-color);
}

.theme-toggle {
    margin-left: 1rem;
}

.lesson-link {
    text-decoration: none;
}

.close-btn {
    text-decoration: none;
    font-size: 1.5rem;
    color: #afafaf;
}

.theme-toggle {
    background: var(--card-bg);
    border: 2px solid var(--light-gray);
    color: var(--text-color);
    padding: 0.5rem;
    border-radius: 50%;
    cursor: pointer;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 0 var(--shadow-color);
    transition: all 0.2s;
}

.theme-toggle:active {
    transform: translateY(2px);
    box-shadow: 0 2px 0 var(--shadow-color);
}

.logout-link:hover {
    color: #FF4B4B;
}

.login-container {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

@media (max-width: 600px) {
    .login-container {
        flex-direction: column;
        width: 100%;
        gap: 0.8rem;
    }

    .login-input {
        width: 100%;
        box-sizing: border-box;
    }

    .login-btn {
        width: 100%;
        justify-content: center;
    }
}

.login-input {
    padding: 0.8rem 1.2rem;
    border-radius: 12px;
    border: 2px solid var(--light-gray);
    background: var(--input-bg);
    color: var(--text-color);
    font-size: 1rem;
    outline: none;
    transition: border-color 0.2s;
    width: 200px;
}

.login-input:focus {
    border-color: var(--secondary-color);
}

.login-btn {
    background: var(--secondary-color);
    color: white;
    padding: 0.8rem 1.5rem;
    border-radius: 12px;
    text-decoration: none;
    font-weight: bold;
    display: flex;
    align-items: center;
    gap: 10px;
    box-shadow: 0 4px 0 #46a302;
    transition: all 0.2s;
    border: none;
    cursor: pointer;
}

.login-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 0 #46a302;
    filter: brightness(1.1);
}

.login-btn:active {
    transform: translateY(2px);
    box-shadow: 0 2px 0 #46a302;
}

.hero-banner {
    background: var(--card-bg);
    border: 2px solid var(--light-gray);
    border-radius: 20px;
    padding: 2rem;
    margin-bottom: 2rem;
    display: flex;
    align-items: center;
    gap: 2rem;
    box-shadow: 0 4px 0 var(--shadow-color);
}

.mascot-hero {
    height: 120px;
    width: auto;
}

.hero-title {
    margin: 0;
    font-size: 2rem;
    font-weight: 800;
    color: var(--text-color);
}

.hero-subtitle {
    margin: 0.5rem 0 0;
    color: var(--text-color);
    font-size: 1.1rem;
}

.desktop-br {
    display: none;
}

@media (min-width: 769px) {
    .desktop-br {
        display: block;
    }
}

/* Unit Styles */
.unit-card {
    background: var(--white);
    border-radius: 15px;
    margin-bottom: 2rem;
    box-shadow: 0 4px 0 var(--light-gray);
    border: 2px solid var(--light-gray);
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.unit-header {
    background: var(--primary-color);
    color: white;
    padding: 1.5rem;
    width: 100%;
}

.unit-title {
    margin: 0;
    font-size: 1.5rem;
    font-weight: 800;
}

.lesson-grid {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2rem;
    padding: 2rem 1.5rem;
    width: 100%;
}

.lesson-row {
    display: flex;
    justify-content: center;
    width: 100%;
    padding: 0 40px;
    /* Buffer for zigzag nodes */
}

/* Offset lessons using transform on the node - keeps the row width stable */
.lesson-node {
    width: 90px;
    height: 80px;
    background: var(--card-bg);
    border: 4px solid var(--light-gray);
    border-radius: 50% / 40%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s;
    position: relative;
    box-shadow: 0 8px 0 var(--shadow-color);
}

.lesson-row:nth-child(4n+2) .lesson-node {
    transform: translateX(40px);
}

.lesson-row:nth-child(4n+3) .lesson-node {
    transform: translateX(60px);
}

.lesson-row:nth-child(4n+4) .lesson-node {
    transform: translateX(30px);
}

@media (max-width: 600px) {
    .lesson-node {
        width: 75px;
        height: 65px;
    }

    .lesson-row:nth-child(4n+2) .lesson-node {
        transform: translateX(20px);
    }

    .lesson-row:nth-child(4n+3) .lesson-node {
        transform: translateX(35px);
    }

    .lesson-row:nth-child(4n+4) .lesson-node {
        transform: translateX(15px);
    }
}

.lesson-node:active {
    transform: translateY(4px);
    box-shadow: 0 4px 0 var(--light-gray);
}

.lesson-node:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 0 var(--light-gray);
}

.lesson-node.active {
    background: var(--primary-color);
    border-color: var(--primary-hover);
    box-shadow: 0 4px 0 var(--primary-hover);
    color: white;
}

.lesson-node.completed {
    background: var(--secondary-color);
    border-color: #46a302;
    box-shadow: 0 4px 0 #46a302;
    color: white;
}

.lesson-node.locked {
    background: #e5e5e5;
    border-color: #cfcfcf;
    box-shadow: 0 4px 0 #cfcfcf;
    color: #afafaf;
    cursor: not-allowed;
}

.lesson-node.locked span {
    filter: grayscale(1);
    opacity: 0.6;
}

.lesson-tooltip {
    position: absolute;
    bottom: -35px;
    background: var(--text-color);
    color: white;
    padding: 4px 8px;
    border-radius: 8px;
    font-size: 0.8rem;
    white-space: nowrap;
    opacity: 0;
    transition: opacity 0.2s;
}

.lesson-node:hover .lesson-tooltip {
    opacity: 1;
}

/* Lesson Screen Layout */
.lesson-container {
    height: 100vh;
    /* Fallback */
    height: 100dvh;
    display: flex;
    flex-direction: column;
    background: var(--white);
    overflow: hidden;
    margin: 0;
}

.lesson-topbar {
    padding: 1rem 2rem;
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.heart-stats {
    font-weight: 800;
    color: #FF4B4B;
    font-size: 1.2rem;
    display: flex;
    align-items: center;
    gap: 0.3rem;
    white-space: nowrap;
}

.progress-bar-bg {
    flex-grow: 1;
    height: 16px;
    background: var(--light-gray);
    border-radius: 10px;
    overflow: hidden;
}

.progress-bar-fill {
    height: 100%;
    background: var(--primary-color);
    width: 0%;
    transition: width 0.3s ease;
}

.lesson-content {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 2rem 1rem;
    width: 100%;
    max-width: 600px;
    margin: 0 auto;
    box-sizing: border-box;
    overflow-y: auto;
}

.question-text {
    font-size: 1.8rem;
    font-weight: 700;
    margin: 0;
    color: var(--text-color);
}

.options-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
    width: 100%;
    max-width: 600px;
    margin: 0 auto;
}

.option-btn {
    background: var(--card-bg);
    border: 2px solid var(--light-gray);
    border-radius: 12px;
    padding: 1rem;
    font-size: 1.2rem;
    font-weight: 600;
    cursor: pointer;
    box-shadow: 0 4px 0 var(--light-gray);
    transition: all 0.1s;
    color: var(--text-color);
}

.option-btn:hover {
    background: #F0F0F0;
}

.option-btn.selected {
    background: #DDF4FF;
    border-color: #1CB0F6;
    box-shadow: 0 4px 0 #1899D6;
    color: #1CB0F6;
}

.lesson-footer {
    padding: 2rem;
    border-top: 2px solid var(--light-gray);
    display: flex;
    justify-content: flex-end;
}

.check-btn {
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 12px;
    padding: 1rem 3rem;
    font-size: 1.2rem;
    font-weight: 800;
    cursor: pointer;
    box-shadow: 0 4px 0 #D89B00;
    transition: transform 0.1s;
}

.check-btn:active {
    transform: translateY(2px);
    box-shadow: 0 2px 0 #D89B00;
}

.check-btn:disabled {
    background: #E5E5E5;
    color: #AFAFAF;
    box-shadow: 0 4px 0 #CFCFCF;
    cursor: not-allowed;
}

.check-btn.success {
    background: var(--secondary-color) !important;
    box-shadow: 0 4px 0 #46a302 !important;
}

.check-btn.error {
    background: #ea2b2b !important;
    box-shadow: 0 4px 0 #af2020 !important;
}

/* Lesson Elements */

.translation-hint {
    color: #afafaf;
    margin-bottom: 2rem;
    cursor: pointer;
    background: #f0f0f0;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 600;
    transition: all 0.2s;
    user-select: none;
    margin: 0 auto 1.5rem auto;
    width: fit-content;
    border: 2px dashed #E5E5E5;
}

.translation-hint:hover {
    background: #e5e5e5;
    transform: translateY(-1px);
}

.translation-hint.revealed {
    background: transparent;
    border: none;
    cursor: default;
    transform: none;
    color: #afafaf;
}

.translation-input {
    padding: 1rem;
    border: 2px solid #E5E5E5;
    border-radius: 12px;
    width: 80%;
    max-width: 400px;
    display: block;
    margin: 0 auto;
    font-size: 1.2rem;
    text-align: center;
    font-family: inherit;
    transition: border-color 0.2s;
}

.translation-input:focus {
    outline: none;
    border-color: var(--primary-color);
}

.finish-emoji {
    font-size: 5rem;
    margin-bottom: 1rem;
}

.finish-text {
    font-size: 1.5rem;
    color: #afafaf;
    margin-bottom: 2rem;
}

/* Animations */
@keyframes pop {
    0% {
        transform: scale(1);
    }

    50% {
        transform: scale(1.1);
    }

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

@keyframes pulse {
    0% {
        transform: scale(1);
        box-shadow: 0 0 0 0 rgba(28, 176, 246, 0.4);
    }

    70% {
        transform: scale(1.05);
        box-shadow: 0 0 0 15px rgba(28, 176, 246, 0);
    }

    100% {
        transform: scale(1);
        box-shadow: 0 0 0 0 rgba(28, 176, 246, 0);
    }
}

/* Speaker styles removed <!-- id: speaker-styles --> */


.correct {
    background: #d7ffb8 !important;
    border-color: #58CC02 !important;
    color: #46a302 !important;
    box-shadow: 0 4px 0 #58CC02 !important;
}

.incorrect {
    background: #ffdfe0 !important;
    border-color: #ea2b2b !important;
    color: #ea2b2b !important;
    box-shadow: 0 4px 0 #ea2b2b !important;
}

.mascot-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1.5rem;
    margin-bottom: 2rem;
    width: 100%;
    position: relative;
}

.mascot-img-wrapper {
    flex-shrink: 0;
    width: 80px;
    height: 80px;
    position: relative;
}

.mascot-img {
    width: 100%;
    height: auto;
    transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.speech-bubble {
    background: var(--card-bg);
    border: 2px solid var(--light-gray);
    border-radius: 15px;
    padding: 1rem;
    position: relative;
    flex-grow: 1;
    font-weight: 600;
    box-shadow: 4px 4px 0 var(--shadow-color);
    text-align: left;
    min-height: 40px;
    display: flex;
    align-items: center;
}

@media (max-width: 600px) {
    .mascot-container {
        flex-direction: column;
        text-align: center;
        gap: 0.5rem;
    }

    .speech-bubble::before,
    .speech-bubble::after {
        display: none;
        /* Remove tail on mobile to save space/simplify */
    }

    .speech-bubble {
        text-align: center;
        justify-content: center;
        width: 100%;
        box-sizing: border-box;
        box-shadow: 0 4px 0 var(--shadow-color);
    }
}

.speech-bubble::before {
    content: '';
    position: absolute;
    left: -10px;
    top: 20px;
    border-top: 10px solid transparent;
    border-bottom: 10px solid transparent;
    border-right: 10px solid var(--light-gray);
}

.speech-bubble::after {
    content: '';
    position: absolute;
    left: -7px;
    top: 21px;
    border-top: 9px solid transparent;
    border-bottom: 9px solid transparent;
    border-right: 9px solid var(--card-bg);
}

.audio-btn {
    background: #1CB0F6;
    color: white;
    border: none;
    border-radius: 50%;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: 0 4px 0 #1899D6;
    margin-left: 1rem;
    transition: all 0.1s;
}

.audio-btn:active {
    transform: translateY(2px);
    box-shadow: 0 2px 0 #1899D6;
}

.audio-btn svg {
    width: 24px;
    height: 24px;
    fill: currentColor;
}

#question-screen {
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-bottom: 2rem;
}

.question-row {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    width: 100%;
    margin-bottom: 1.5rem;
}

.fade-in {
    animation: fadeIn 0.4s ease-out forwards;
}

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

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

@keyframes shake {

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

    25% {
        transform: translateX(-5px);
    }

    75% {
        transform: translateX(5px);
    }
}

.shake {
    animation: shake 0.2s ease-in-out 2;
}

@keyframes jump {

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

    50% {
        transform: translateY(-20px);
    }
}

.jump {
    animation: jump 0.4s ease-out;
}

/* Responsive Design */
@media (max-width: 600px) {
    .container {
        padding: 1rem;
    }

    .header {
        margin-bottom: 1.5rem;
    }

    .logo {
        font-size: 1.3rem;
    }

    .stats {
        gap: 0.8rem;
        font-size: 1rem;
    }

    .hero-banner {
        flex-direction: column;
        text-align: center;
        padding: 1.5rem;
        gap: 1rem;
    }

    .mascot-hero {
        height: 80px;
    }

    .hero-title {
        font-size: 1.5rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .unit-header {
        padding: 1rem;
    }

    .unit-card {
        padding: 0;
        /* Let content handle padding */
    }

    .lesson-grid {
        padding: 1rem 0;
    }

    .unit-title {
        font-size: 1.2rem;
    }


    .lesson-grid {
        gap: 1.5rem;
        padding: 1rem 0;
    }

    .lesson-node {
        width: 75px;
        height: 65px;
        box-shadow: 0 5px 0 var(--light-gray);
    }

    .lesson-tooltip {
        display: none;
    }

    .lesson-topbar {
        padding: 0.75rem 1rem;
        gap: 1rem;
    }

    .heart-stats {
        font-size: 1rem;
    }

    .lesson-content {
        padding: 1rem;
        justify-content: flex-start;
    }

    .mascot-container {
        gap: 0.8rem;
        margin-bottom: 1rem;
    }

    .mascot-img-wrapper {
        width: 60px;
        height: 60px;
    }

    .speech-bubble {
        font-size: 0.95rem;
        padding: 0.8rem;
    }

    .question-row {
        flex-direction: column;
        gap: 0.5rem;
    }

    .audio-btn {
        margin-left: 0;
        width: 48px;
        height: 48px;
    }

    #mic-status {
        font-size: 0.9rem;
        padding: 0 1rem;
    }

    .question-text {
        font-size: 1.4rem;
        margin-bottom: 1rem;
    }

    .translation-word {
        font-size: 2rem;
    }

    .translation-input {
        width: 100%;
        box-sizing: border-box;
    }

    .finish-emoji {
        font-size: 3.5rem;
    }

    .finish-text {
        font-size: 1.2rem;
    }

    .options-grid {
        grid-template-columns: 1fr;
        gap: 0.75rem;
    }

    .option-btn {
        padding: 0.8rem;
        font-size: 1.1rem;
    }

    .lesson-footer {
        padding: 1rem;
    }

    .check-btn {
        width: 100%;
        padding: 1rem;
        font-size: 1.1rem;
    }


}

.tip-screen {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    max-width: 600px;
    width: 100%;
    background: #EAFBFF;
    border: 3px solid #1CB0F6;
    border-radius: 20px;
    padding: 2rem;
    box-shadow: 0 8px 0 #1899D6;
    margin: 1rem 0;
    box-sizing: border-box;
}

[data-theme="dark"] .tip-screen {
    background: #1A2634;
    border-color: #1899D6;
    box-shadow: 0 8px 0 #000000;
}

.tip-title {
    font-size: 1.5rem;
    font-weight: 800;
    color: #1CB0F6;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.tip-text {
    font-size: 1.2rem;
    line-height: 1.6;
    color: #4B4B4B;
    font-weight: 500;
}

.visual-image {
    width: 150px;
    height: 150px;
    object-fit: contain;
    margin: 0 auto 1.5rem auto;
    display: block;
}

.word-bank-container {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: 0.8rem;
    margin: 2rem auto;
    min-height: 60px;
    padding: 1rem;
    border-bottom: 2px solid var(--light-gray);
    width: 100%;
    max-width: 600px;
}

.word-tile {
    background: var(--card-bg);
    border: 2px solid var(--light-gray);
    border-radius: 12px;
    padding: 0.6rem 1.2rem;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    box-shadow: 0 4px 0 var(--light-gray);
    transition: all 0.1s;
    user-select: none;
    color: var(--text-color);
}

.word-tile:active {
    transform: translateY(2px);
    box-shadow: 0 2px 0 var(--light-gray);
}

.word-tile.used {
    background: #E5E5E5;
    color: #E5E5E5;
    box-shadow: none;
    transform: none;
    cursor: default;
    border-color: #E5E5E5;
}

.listening-mode .question-text {
    visibility: hidden;
}

.listening-mode .question-row .audio-btn {
    width: 80px;
    height: 80px;
    margin: 2rem 0;
}

@media (max-width: 600px) {
    .tip-screen {
        padding: 1.5rem 1rem;
        margin: 1rem 0;
        width: 100%;
    }

    .tip-text {
        font-size: 1rem;
    }

    .visual-image {
        width: 120px;
        height: 120px;
    }

    .word-bank-container {
        gap: 0.5rem;
        padding: 0.5rem;
    }

    .word-tile {
        padding: 0.5rem 0.8rem;
        font-size: 1rem;
    }
}