:root {
    --primary: #FF477E;
    --primary-light: #FF85A2;
    --secondary: #4361EE;
    --accent: #FFBE0B;
    --background: #F8F9FA;
    --surface: #FFFFFF;
    --text-main: #2B2D42;
    --text-muted: #8D99AE;
    --success: #06D6A0;
    --card-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(255, 255, 255, 0.3);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Outfit', sans-serif;
    background-color: var(--background);
    color: var(--text-main);
    line-height: 1.6;
    overflow-x: hidden;
}

h1,
h2,
h3,
.jp-font {
    font-family: 'Noto Sans JP', sans-serif;
}

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

/* Navbar */
.navbar {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 5%;
    border-bottom: 1px solid var(--glass-border);
    transition: all 0.3s ease;
}

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
}

.logo-text {
    font-weight: 700;
    font-size: 1.4rem;
    background: linear-gradient(45deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-links {
    display: flex;
    gap: 1.5rem;
}

.nav-link {
    text-decoration: none;
    color: var(--text-muted);
    font-weight: 600;
    transition: all 0.3s ease;
    position: relative;
    font-size: 0.95rem;
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary);
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--primary);
    border-radius: 10px;
}

/* Main Content */
main {
    flex: 1;
    padding: 2rem 5%;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

/* Loader */
.loader-container {
    height: 60vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

.loader {
    width: 50px;
    height: 50px;
    border: 5px solid var(--primary-light);
    border-bottom-color: var(--primary);
    border-radius: 50%;
    animation: rotation 1s linear infinite;
}

@keyframes rotation {
    0% {
        transform: rotate(0deg);
    }

    100% {
        transform: rotate(360deg);
    }
}

/* Cards & Layout */
.dashboard-header {
    margin-bottom: 2.5rem;
    animation: fadeInUp 0.8s ease;
}

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

.welcome-card {
    background: linear-gradient(135deg, rgba(255, 71, 126, 0.9), rgba(67, 97, 238, 0.7)), url('assets/hero.png');
    background-size: cover;
    background-position: center;
    border-radius: 24px;
    padding: 3rem;
    color: white;
    position: relative;
    overflow: hidden;
    margin-bottom: 3rem;
    box-shadow: 0 20px 40px rgba(255, 71, 126, 0.2);
    display: flex;
    flex-direction: column;
    justify-content: center;
    min-height: 250px;
}

.welcome-card h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.welcome-card p {
    font-size: 1.1rem;
    opacity: 0.9;
    max-width: 600px;
}

.floating-shapes div {
    position: absolute;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
}

/* Section Grid */
.section-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.lesson-card {
    background: var(--surface);
    border-radius: 20px;
    padding: 1.5rem;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border: 1px solid transparent;
    cursor: pointer;
    box-shadow: var(--card-shadow);
    display: flex;
    flex-direction: column;
    gap: 1rem;
    animation: fadeInUp 0.5s ease backwards;
}

.lesson-card:hover {
    transform: translateY(-10px);
    border-color: var(--primary-light);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.1);
}

.icon-wrapper {
    width: 60px;
    height: 60px;
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.card-title {
    font-weight: 700;
    font-size: 1.25rem;
}

.card-desc {
    font-size: 0.95rem;
    color: var(--text-muted);
}

.progress-container {
    margin-top: auto;
}

.progress-bar {
    height: 8px;
    background: #E9ECEF;
    border-radius: 4px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: var(--primary);
    width: 0%;
    transition: width 1s ease;
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

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


/* Responsiveness */
@media (max-width: 1024px) {
    .section-grid {
        grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    }
}

@media (max-width: 768px) {
    .navbar {
        flex-direction: column;
        gap: 1rem;
        padding: 1rem;
    }

    .nav-links {
        gap: 1rem;
        width: 100%;
        justify-content: center;
        flex-wrap: wrap;
    }

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

    .welcome-card {
        padding: 1.5rem;
        min-height: 200px;
    }

    .welcome-card h1 {
        font-size: 1.8rem;
    }

    .welcome-card p {
        font-size: 1rem;
    }

    main {
        padding: 1rem;
        padding-bottom: 3rem;
    }

    .section-grid {
        gap: 1.2rem;
    }

    .auth-container {
        margin: 2rem 1rem;
        padding: 1.5rem;
    }
}

@media (max-width: 480px) {
    .navbar {
        padding: 0.8rem 1rem;
    }

    .nav-links {
        gap: 0.5rem;
        justify-content: space-between;
        width: 100%;
        overflow-x: auto;
        /* Allow horizontal scroll if needed */
        padding-bottom: 5px;
        /* For scrollbar space */
        -webkit-overflow-scrolling: touch;
    }

    .nav-link {
        font-size: 0.85rem;
        padding: 0.3rem 0;
        white-space: nowrap;
    }

    .kana-grid {
        grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
        gap: 0.8rem;
    }

    .kanji-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1rem;
    }

    .quiz-container {
        padding: 1.5rem;
        margin: 1rem 0;
        /* Removing auto margin for full width feel */
        border-radius: 20px;
    }

    .quiz-question {
        font-size: 1.25rem;
        margin-bottom: 1.5rem;
    }

    .option-btn {
        padding: 1rem;
        font-size: 0.95rem;
    }

    /* Matching game stacking for very small screens */
    #matching-left,
    #matching-right {
        gap: 0.5rem;
    }

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

    .dashboard-header h1 {
        font-size: 1.8rem;
    }

    .streak-display {
        font-size: 0.8rem !important;
        width: 100%;
        justify-content: center;
    }
}

/* Lesson Modules specific styles */
.kana-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
    gap: 1rem;
    margin-top: 2rem;
}

.kana-item {
    background: white;
    border-radius: 12px;
    padding: 1rem;
    text-align: center;
    border: 2px solid transparent;
    cursor: pointer;
    transition: all 0.2s;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
}

/* Profile & Container Section */
.writing-container {
    background: white;
    padding: 2rem;
    border-radius: 24px;
    box-shadow: var(--card-shadow);
    text-align: center;
}

.kana-item:hover {
    border-color: var(--primary);
    background: #FFF5F7;
}

.kana-item .jp {
    font-size: 2rem;
    font-weight: 700;
    display: block;
}

.kana-item .en {
    font-size: 0.9rem;
    color: var(--text-muted);
    font-weight: 600;
}

/* Quiz UI */
.quiz-container {
    max-width: 600px;
    margin: 2rem auto;
    background: white;
    padding: 2.5rem;
    border-radius: 24px;
    box-shadow: var(--card-shadow);
}

.quiz-question {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 2rem;
    text-align: center;
}

.options-grid {
    display: grid;
    gap: 1rem;
}

.option-btn {
    padding: 1.2rem;
    border: 2px solid #E9ECEF;
    border-radius: 16px;
    background: none;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    text-align: left;
}

.option-btn:hover {
    border-color: var(--primary-light);
    background: #FFF5F7;
}

.option-btn.correct {
    background: #D1FAE5;
    border-color: #10B981;
    color: #065F46;
}

.option-btn.wrong {
    background: #FEE2E2;
    border-color: #EF4444;
    color: #991B1B;
}

/* Quiz Header - Responsive */
.quiz-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid #f1f3f5;
    position: relative;
}

.quiz-exit-btn {
    background: none;
    border: none;
    color: #fa5252;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 4px;
    font-weight: 600;
    font-size: 0.9rem;
    padding: 0.5rem;
    border-radius: 8px;
    transition: background 0.2s;
}

.quiz-exit-btn:hover {
    background: #fff5f5;
}

.quiz-title {
    font-weight: 700;
    color: var(--text-main);
    font-size: 1.1rem;
    text-align: center;
    flex: 1;
    /* Allow title to take straight space */
}

/* Mobile adjustments for quiz header */
@media (max-width: 480px) {
    .quiz-header {
        flex-direction: column-reverse;
        gap: 1rem;
        align-items: flex-start;
    }

    .quiz-title {
        width: 100%;
        text-align: left;
        font-size: 1.2rem;
    }

    .quiz-exit-btn {
        width: 100%;
        justify-content: flex-start;
        padding-left: 0;
    }
}

.btn-primary {
    background: var(--primary);
    color: white;
    border: none;
    padding: 0.8rem 1.5rem;
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: 0.3s;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    white-space: nowrap;
}

/* Conversational Section */
.chat-container {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.chat-bubble {
    max-width: 70%;
    padding: 1rem 1.5rem;
    border-radius: 20px;
    position: relative;
    animation: fadeIn 0.5s ease;
}

.chat-bubble.ai {
    background: white;
    align-self: flex-start;
    border-bottom-left-radius: 5px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
}

.chat-bubble.user {
    background: var(--primary);
    color: white;
    align-self: flex-end;
    border-bottom-right-radius: 5px;
}

.chat-bubble .translation {
    display: block;
    font-size: 0.85rem;
    opacity: 0.7;
    margin-top: 5px;
}

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

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

/* Kanji Section */
.kanji-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 1.5rem;
}

.kanji-card {
    background: white;
    border-radius: 16px;
    padding: 2rem 1.5rem 1.5rem;
    text-align: center;
    box-shadow: var(--card-shadow);
    transition: 0.3s;
    position: relative;
    overflow: visible;
}

.kanji-card:hover {
    transform: translateY(-5px);
}

.kanji-furigana {
    position: absolute;
    top: 5px;
    left: 10px;
    font-size: 0.7rem;
    color: var(--primary);
    font-weight: 700;
    opacity: 0.8;
}

.kanji-level-badge {
    position: absolute;
    bottom: 0px;
    right: 0px;
    background: var(--secondary);
    color: white;
    font-size: 0.65rem;
    padding: 2px 8px;
    border-radius: 10px 0 16px 0;
    font-weight: 800;
}

.kanji-char {
    font-size: 3.5rem;
    color: var(--text-main);
    display: block;
    line-height: 1;
    margin-bottom: 0.5rem;
}

.kanji-mean {
    background: #F8F9FA;
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 0.85rem;
    color: var(--primary);
    font-weight: 700;
}

/* Type Badges */
.type-badge {
    font-size: 0.7rem;
    padding: 4px 8px;
    background: #F1F3F5;
    color: var(--text-muted);
    border-radius: 6px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.lesson-card:hover .type-badge {
    background: var(--primary-light);
    color: white;
}

/* Filter Buttons */
.filter-container {
    padding-bottom: 1rem;
    border-bottom: 1px solid #eee;
}

.filter-btn {
    padding: 0.6rem 1.2rem;
    border: 1px solid #E9ECEF;
    background: white;
    border-radius: 50px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    color: var(--text-muted);
}

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

.filter-btn.active {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
    box-shadow: 0 4px 12px rgba(255, 71, 126, 0.2);
}

/* Learned Items */
.learned-check {
    width: 30px;
    height: 30px;
    border-radius: 50%;
    background: #f1f3f5;
    color: #adb5bd;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.learned-check:hover {
    background: #e9ecef;
    color: var(--primary);
}

.learned .learned-check {
    background: #D1FAE5;
    color: #10B981;
    border-color: #10B981;
}

.learned-check.small {
    width: 24px;
    height: 24px;
}

.kana-item.learned,
.kanji-card.learned,
.lesson-card.learned {
    border-color: #10B981 !important;
    background: #F0FDF4 !important;
}

.kana-item {
    position: relative;
    padding-top: 1.5rem !important;
}

.kana-item .learned-check {
    position: absolute;
    top: 5px;
    right: 5px;
    transform: scale(0.7);
}

.matching-btn.selected {
    border-color: var(--primary);
    background: #FFF5F7;
    color: var(--primary);
    box-shadow: 0 0 0 2px var(--primary);
    transform: scale(1.02);
}

.matching-btn.correct {
    background: #D1FAE5;
    border-color: #10B981;
    color: #065F46;
    pointer-events: none;
}

.matching-btn.wrong {
    background: #FEE2E2;
    border-color: #EF4444;
    color: #991B1B;
    animation: shake 0.5s;
}

@keyframes shake {

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

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

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

.auth-container {
    max-width: 400px;
    margin: 4rem auto;
    padding: 2.5rem;
    background: white;
    border-radius: 24px;
    box-shadow: var(--card-shadow);
    animation: fadeInUp 0.6s ease;
}

.auth-input-group {
    margin-bottom: 1.5rem;
    text-align: left;
}

.auth-input-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--text-main);
}

.auth-input {
    width: 100%;
    padding: 1rem;
    border: 2px solid #E9ECEF;
    border-radius: 12px;
    font-size: 1rem;
    transition: 0.3s;
}

.auth-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(255, 71, 126, 0.1);
}

.auth-switch {
    margin-top: 1.5rem;
    font-size: 0.9rem;
    color: var(--text-muted);
}

.auth-switch a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 700;
    cursor: pointer;
}