@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Plus+Jakarta+Sans:wght@400;500;600;700;800&display=swap');

:root {
    /* Color Palette */
    --bg-primary: #0a0a12;
    --bg-secondary: #121124;
    --glass-bg: rgba(22, 21, 45, 0.6);
    --glass-border: rgba(255, 255, 255, 0.08);
    --glass-highlight: rgba(255, 255, 255, 0.03);
    
    --color-primary: #8a2be2;      /* Neon Violet */
    --color-secondary: #4a00e0;    /* Deep Blue/Indigo */
    --color-accent: #ff007f;       /* Pink/Magenta */
    --color-teal: #00f2fe;         /* Cyan */
    --color-success: #00f5a0;      /* Emerald */
    --color-warning: #ff7b00;      /* Coral Orange */
    
    /* Text Colors */
    --text-main: #f1f0f7;
    --text-muted: #9c97b8;
    --text-dark: #12121e;
    
    /* Gradient Accents */
    --gradient-gemini: linear-gradient(135deg, #9b51e0, #3082ec, #05c3de);
    --gradient-primary: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    --gradient-accent: linear-gradient(135deg, var(--color-accent), var(--color-primary));
    --gradient-success: linear-gradient(135deg, #00b8ff, #00f5a0);
    
    /* Box Shadows */
    --shadow-neon: 0 8px 32px 0 rgba(138, 43, 226, 0.15);
    --shadow-soft: 0 10px 30px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 20px rgba(138, 43, 226, 0.3);
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    --transition-slow: 0.5s ease;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-main);
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
}

/* Ambient Background Glows */
.ambient-glow-1 {
    position: fixed;
    top: -10%;
    left: -10%;
    width: 60vw;
    height: 60vh;
    background: radial-gradient(circle, rgba(138, 43, 226, 0.15) 0%, rgba(0, 0, 0, 0) 70%);
    z-index: -2;
    pointer-events: none;
    filter: blur(80px);
}

.ambient-glow-2 {
    position: fixed;
    bottom: -10%;
    right: -10%;
    width: 60vw;
    height: 60vh;
    background: radial-gradient(circle, rgba(5, 195, 222, 0.1) 0%, rgba(0, 0, 0, 0) 70%);
    z-index: -2;
    pointer-events: none;
    filter: blur(80px);
}

/* Base Layout Container */
.app-container {
    display: flex;
    min-height: 100vh;
    width: 100vw;
    position: relative;
    z-index: 1;
}

/* Sidebar Styling */
.sidebar {
    width: 280px;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-right: 1px solid var(--glass-border);
    padding: 2.5rem 1.5rem;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    flex-shrink: 0;
    z-index: 10;
}

.logo-container {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    margin-bottom: 3rem;
}

.logo-icon {
    width: 42px;
    height: 42px;
    background: var(--gradient-gemini);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 15px rgba(138, 43, 226, 0.4);
}

.logo-icon svg {
    width: 24px;
    height: 24px;
    fill: #ffffff;
}

.logo-text {
    font-family: 'Plus Jakarta Sans', sans-serif;
    font-weight: 800;
    font-size: 1.4rem;
    letter-spacing: -0.5px;
    background: var(--gradient-gemini);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-menu {
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
    flex-grow: 1;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem 1.2rem;
    border-radius: 12px;
    color: var(--text-muted);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition-normal);
    border: 1px solid transparent;
    cursor: pointer;
}

.nav-item svg {
    width: 20px;
    height: 20px;
    stroke: currentColor;
    stroke-width: 2;
    fill: none;
    transition: var(--transition-normal);
}

.nav-item:hover {
    color: var(--text-main);
    background: var(--glass-highlight);
    border-color: rgba(255, 255, 255, 0.05);
}

.nav-item.active {
    color: #ffffff;
    background: rgba(138, 43, 226, 0.15);
    border-color: rgba(138, 43, 226, 0.3);
    box-shadow: var(--shadow-neon);
}

.nav-item.active svg {
    stroke: var(--color-teal);
    filter: drop-shadow(0 0 5px var(--color-teal));
}

.sidebar-footer {
    border-top: 1px solid var(--glass-border);
    padding-top: 1.5rem;
    margin-top: 2rem;
}

.api-status-card {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    padding: 1rem;
    font-size: 0.85rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.status-indicator {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--color-warning);
}

.status-dot.active {
    background: var(--color-success);
    box-shadow: 0 0 8px var(--color-success);
}

.status-dot.proxy {
    background: #00d2ff;
    box-shadow: 0 0 8px #00d2ff;
}

/* Main Content Area */
.main-content {
    flex-grow: 1;
    padding: 2.5rem;
    height: 100vh;
    overflow-y: auto;
    position: relative;
}

/* View Section Control */
.view-section {
    display: none;
    opacity: 0;
    transform: translateY(15px);
    transition: opacity var(--transition-normal), transform var(--transition-normal);
}

.view-section.active-view {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    opacity: 1;
    transform: translateY(0);
}

/* Section Header */
.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
}

.section-title {
    font-family: 'Plus Jakarta Sans', sans-serif;
    font-weight: 800;
    font-size: 2.2rem;
    letter-spacing: -0.5px;
    background: linear-gradient(135deg, #ffffff 60%, var(--text-muted));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.section-desc {
    color: var(--text-muted);
    font-size: 1rem;
    margin-top: 0.3rem;
}

/* Universal Glass Card Layout */
.glass-card {
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    padding: 2rem;
    box-shadow: var(--shadow-soft);
    position: relative;
    overflow: hidden;
}

.glass-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.05) 0%, rgba(255, 255, 255, 0) 100%);
    pointer-events: none;
}

/* Buttons Styling */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.6rem;
    padding: 0.8rem 1.6rem;
    border-radius: 12px;
    font-weight: 600;
    font-family: 'Inter', sans-serif;
    font-size: 0.95rem;
    cursor: pointer;
    transition: var(--transition-normal);
    border: 1px solid transparent;
}

.btn-primary {
    background: var(--gradient-primary);
    color: #ffffff;
    box-shadow: 0 4px 15px rgba(138, 43, 226, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

.btn-accent {
    background: var(--gradient-accent);
    color: #ffffff;
    box-shadow: 0 4px 15px rgba(255, 0, 127, 0.3);
}

.btn-accent:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 20px rgba(255, 0, 127, 0.4);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.05);
    border-color: var(--glass-border);
    color: var(--text-main);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.2);
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.85rem;
    border-radius: 8px;
}

.btn-icon-only {
    padding: 0.6rem;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Input Fields and Forms */
.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
    width: 100%;
}

.form-label {
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--text-main);
}

.form-control {
    background: rgba(10, 10, 18, 0.5);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    padding: 0.9rem 1.2rem;
    color: var(--text-main);
    font-family: inherit;
    font-size: 1rem;
    transition: var(--transition-normal);
}

.form-control:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 10px rgba(138, 43, 226, 0.25);
    background: rgba(10, 10, 18, 0.8);
}

select.form-control {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%239c97b8'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M19 9l-7 7-7-7'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 1.2rem center;
    background-size: 1.2rem;
    padding-right: 3rem;
}

/* ==========================================================================
   STORY GENERATOR VIEW
   ========================================================================== */
.story-creator-grid {
    display: grid;
    grid-template-columns: 1.2fr 2fr;
    gap: 2rem;
    align-items: start;
}

.story-sidebar {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.quick-topics {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 0.5rem;
}

.topic-tag {
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    padding: 0.4rem 1rem;
    font-size: 0.85rem;
    color: var(--text-muted);
    cursor: pointer;
    transition: var(--transition-fast);
}

.topic-tag:hover {
    color: var(--text-main);
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.15);
}

.topic-tag.selected {
    color: #ffffff;
    background: rgba(138, 43, 226, 0.25);
    border-color: var(--color-primary);
}

.story-viewer-container {
    min-height: 450px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.empty-story-placeholder {
    text-align: center;
    color: var(--text-muted);
    padding: 4rem 2rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.empty-story-placeholder svg {
    width: 64px;
    height: 64px;
    stroke: var(--text-muted);
    opacity: 0.4;
}

/* Interactive Story Display */
.story-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    border-bottom: 1px solid var(--glass-border);
    padding-bottom: 1.2rem;
    margin-bottom: 1.5rem;
}

.story-title {
    font-family: 'Plus Jakarta Sans', sans-serif;
    font-size: 1.6rem;
    font-weight: 700;
    color: #ffffff;
}

.story-topic-badge {
    background: var(--gradient-primary);
    padding: 0.3rem 0.8rem;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

.story-body {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    max-height: 480px;
    overflow-y: auto;
    padding-right: 0.5rem;
}

/* Custom Scrollbars */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.01);
}

::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 10px;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.2);
}

/* Sentence Block inside Story */
.sentence-block {
    position: relative;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(255, 255, 255, 0.04);
    border-radius: 12px;
    padding: 1.2rem;
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
    transition: var(--transition-normal);
}

.sentence-block:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(138, 43, 226, 0.2);
    transform: translateX(4px);
}

.sentence-top-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
}

.sentence-text {
    font-size: 1.15rem;
    font-weight: 500;
    line-height: 1.5;
    color: var(--text-main);
    flex-grow: 1;
}

.sentence-actions {
    display: flex;
    gap: 0.5rem;
    align-shrink: 0;
}

.action-btn-circle {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--glass-border);
    color: var(--text-muted);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition-fast);
}

.action-btn-circle:hover {
    color: #ffffff;
    background: rgba(138, 43, 226, 0.2);
    border-color: var(--color-primary);
    transform: scale(1.1);
}

.action-btn-circle.saved {
    color: var(--color-accent);
    background: rgba(255, 0, 127, 0.15);
    border-color: rgba(255, 0, 127, 0.3);
}

.action-btn-circle svg {
    width: 16px;
    height: 16px;
    fill: none;
    stroke: currentColor;
    stroke-width: 2.5;
}

.action-btn-circle.saved svg {
    fill: currentColor;
}

/* Sentence Translation and Notes */
.sentence-details-drawer {
    border-top: 1px dashed rgba(255, 255, 255, 0.08);
    padding-top: 0.8rem;
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
}

.translation-label {
    font-size: 0.95rem;
    color: var(--color-teal);
    font-weight: 500;
    line-height: 1.5;
}

.vocab-tag-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
}

.vocab-tag {
    background: rgba(0, 242, 254, 0.08);
    border: 1px solid rgba(0, 242, 254, 0.2);
    border-radius: 6px;
    padding: 0.2rem 0.5rem;
    font-size: 0.8rem;
    color: #d1f7ff;
}

/* Loading Spinner overlay */
.loading-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(10, 10, 18, 0.85);
    z-index: 5;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 1.5rem;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-normal);
}

.loading-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid rgba(138, 43, 226, 0.1);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 1s infinite linear;
}

.loading-text {
    font-weight: 600;
    color: var(--text-muted);
}

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

/* ==========================================================================
   FLASHCARDS VIEW (Sentence Practice)
   ========================================================================== */
.flashcards-layout {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    max-width: 800px;
    margin: 0 auto;
}

.flashcard-stats {
    display: flex;
    justify-content: space-around;
    align-items: center;
    background: rgba(255, 255, 255, 0.02);
    border-radius: 12px;
    padding: 1rem;
    border: 1px solid var(--glass-border);
}

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

.stat-number {
    font-size: 1.8rem;
    font-family: 'Plus Jakarta Sans', sans-serif;
    font-weight: 800;
    color: #ffffff;
}

.stat-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* 3D Flip Card Container */
.card-scene {
    width: 100%;
    height: 320px;
    perspective: 1000px;
}

.card-inner {
    width: 100%;
    height: 100%;
    position: relative;
    transform-style: preserve-3d;
    transition: transform var(--transition-slow);
    cursor: pointer;
}

.card-inner.is-flipped {
    transform: rotateY(180deg);
}

.card-face {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    border-radius: 24px;
    padding: 2.5rem;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    box-shadow: var(--shadow-soft);
    border: 1px solid var(--glass-border);
}

.card-front {
    background: linear-gradient(135deg, rgba(30, 27, 57, 0.8), rgba(22, 21, 45, 0.8));
}

.card-back {
    background: linear-gradient(135deg, rgba(22, 21, 45, 0.9), rgba(15, 12, 33, 0.9));
    transform: rotateY(180deg);
    border-color: rgba(138, 43, 226, 0.3);
}

.card-badge {
    align-self: flex-start;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--text-muted);
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
}

.card-content-text {
    font-size: 1.5rem;
    font-weight: 600;
    text-align: center;
    line-height: 1.6;
    margin: auto 0;
}

.card-front .card-content-text {
    color: var(--color-teal);
    font-family: 'Plus Jakarta Sans', sans-serif;
}

.card-back .card-content-text {
    color: #ffffff;
}

.card-tip-text {
    text-align: center;
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* Card Play Pronunciation Action */
.card-audio-trigger {
    position: absolute;
    bottom: 2rem;
    right: 2rem;
    width: 44px;
    height: 44px;
    background: var(--gradient-primary);
    border: none;
    border-radius: 50%;
    color: #ffffff;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: 0 4px 10px rgba(138, 43, 226, 0.3);
    transition: var(--transition-fast);
}

.card-audio-trigger:hover {
    transform: scale(1.1);
    box-shadow: var(--shadow-glow);
}

.card-audio-trigger svg {
    width: 20px;
    height: 20px;
}

/* Flashcard Navigation Controls */
.card-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1.5rem;
}

.card-nav-btn {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    border: 1px solid var(--glass-border);
    background: rgba(255, 255, 255, 0.03);
    color: var(--text-muted);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition-fast);
}

.card-nav-btn:hover:not(:disabled) {
    color: #ffffff;
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.2);
}

.card-nav-btn:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

.card-nav-btn svg {
    width: 24px;
    height: 24px;
    stroke: currentColor;
    stroke-width: 2.5;
}

.card-action-group {
    display: flex;
    gap: 1rem;
    flex-grow: 1;
    justify-content: center;
}

/* ==========================================================================
   PRACTICE CHALLENGES VIEW (Interactive Tests)
   ========================================================================== */
.challenge-container {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.challenge-type-selector {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.challenge-type-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    padding: 1.5rem;
    cursor: pointer;
    transition: var(--transition-normal);
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.8rem;
}

.challenge-type-card:hover {
    background: rgba(255, 255, 255, 0.04);
    border-color: var(--color-primary);
    transform: translateY(-4px);
}

.challenge-type-card.active {
    background: rgba(138, 43, 226, 0.1);
    border-color: var(--color-primary);
    box-shadow: var(--shadow-neon);
}

.challenge-type-icon {
    width: 48px;
    height: 48px;
    background: rgba(255, 255, 255, 0.03);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-teal);
    transition: var(--transition-normal);
}

.challenge-type-card.active .challenge-type-icon {
    background: var(--gradient-primary);
    color: #ffffff;
}

.challenge-type-icon svg {
    width: 24px;
    height: 24px;
    stroke: currentColor;
    stroke-width: 2;
    fill: none;
}

.challenge-type-title {
    font-weight: 700;
    font-size: 1.1rem;
}

.challenge-type-desc {
    color: var(--text-muted);
    font-size: 0.85rem;
    line-height: 1.4;
}

/* Arena Layout */
.challenge-arena {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.challenge-prompt {
    font-size: 1.1rem;
    color: var(--text-muted);
    text-align: center;
    margin-bottom: 0.5rem;
}

.challenge-target {
    font-size: 1.4rem;
    font-weight: 700;
    text-align: center;
    color: #ffffff;
    font-family: 'Plus Jakarta Sans', sans-serif;
    margin-bottom: 1rem;
}

/* Fill-in-the-blank text */
.blank-sentence-display {
    font-size: 1.4rem;
    text-align: center;
    font-weight: 500;
    line-height: 1.8;
    color: var(--text-main);
    padding: 2rem;
    background: rgba(0, 0, 0, 0.15);
    border-radius: 12px;
    margin-bottom: 1.5rem;
}

.sentence-blank-input {
    background: none;
    border: none;
    border-bottom: 2px solid var(--color-primary);
    color: var(--color-teal);
    font-size: 1.4rem;
    font-weight: 700;
    text-align: center;
    width: 140px;
    padding: 0 5px;
    font-family: inherit;
    transition: var(--transition-fast);
}

.sentence-blank-input:focus {
    outline: none;
    border-bottom-color: var(--color-teal);
    width: 160px;
}

/* Word Puzzle Tiles sorting */
.word-puzzle-slots {
    min-height: 80px;
    background: rgba(0, 0, 0, 0.15);
    border: 1px dashed var(--glass-border);
    border-radius: 12px;
    padding: 1rem;
    display: flex;
    flex-wrap: wrap;
    gap: 0.8rem;
    justify-content: center;
    align-content: center;
    margin-bottom: 1.5rem;
}

.word-tile {
    background: var(--gradient-primary);
    border: 1px solid var(--glass-border);
    color: #ffffff;
    padding: 0.6rem 1.2rem;
    border-radius: 10px;
    font-weight: 600;
    cursor: pointer;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
    transition: var(--transition-fast);
    animation: popIn 0.3s ease;
}

.word-tile:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 15px rgba(138, 43, 226, 0.25);
}

.word-pool {
    display: flex;
    flex-wrap: wrap;
    gap: 0.8rem;
    justify-content: center;
    padding: 1rem;
    background: rgba(255, 255, 255, 0.02);
    border-radius: 12px;
}

.word-tile-placeholder {
    width: 60px;
    height: 40px;
    background: rgba(255, 255, 255, 0.02);
    border: 1px dashed var(--glass-border);
    border-radius: 10px;
}

@keyframes popIn {
    0% { transform: scale(0.8); opacity: 0; }
    100% { transform: scale(1); opacity: 1; }
}

/* Checker Feedback Panels */
.feedback-alert {
    border-radius: 12px;
    padding: 1.2rem;
    border: 1px solid transparent;
    display: none;
    flex-direction: column;
    gap: 0.5rem;
    animation: fadeIn var(--transition-normal);
}

.feedback-alert.correct {
    display: flex;
    background: rgba(0, 245, 160, 0.1);
    border-color: rgba(0, 245, 160, 0.3);
    color: #e6fffa;
}

.feedback-alert.incorrect {
    display: flex;
    background: rgba(255, 123, 0, 0.1);
    border-color: rgba(255, 123, 0, 0.3);
    color: #fffaf0;
}

.feedback-title {
    font-weight: 700;
    font-size: 1.05rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.feedback-body {
    font-size: 0.95rem;
    line-height: 1.5;
}

/* ==========================================================================
   AI TUTOR CHAT VIEW
   ========================================================================== */
.chat-layout {
    display: grid;
    grid-template-columns: 1fr 2.5fr;
    gap: 2rem;
    height: calc(100vh - 12rem);
    min-height: 500px;
}

.chat-settings-panel {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.persona-option {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    padding: 1rem;
    cursor: pointer;
    transition: var(--transition-normal);
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
}

.persona-option:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: var(--color-primary);
}

.persona-option.selected {
    background: rgba(138, 43, 226, 0.15);
    border-color: var(--color-primary);
}

.persona-title {
    font-weight: 700;
    font-size: 0.95rem;
}

.persona-desc {
    font-size: 0.8rem;
    color: var(--text-muted);
    line-height: 1.4;
}

.chat-arena {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    background: rgba(0, 0, 0, 0.2);
    border-radius: 20px;
    border: 1px solid var(--glass-border);
    overflow: hidden;
    height: 100%;
}

.chat-messages-container {
    flex-grow: 1;
    padding: 1.5rem;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

/* Message Bubbles */
.chat-bubble {
    max-width: 75%;
    padding: 1rem 1.2rem;
    border-radius: 16px;
    line-height: 1.5;
    font-size: 0.95rem;
    animation: messagePop 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

@keyframes messagePop {
    from { transform: translateY(10px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

.chat-bubble.assistant {
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--glass-border);
    align-self: flex-start;
    border-top-left-radius: 4px;
    color: var(--text-main);
}

.chat-bubble.user {
    background: var(--gradient-primary);
    align-self: flex-end;
    border-top-right-radius: 4px;
    color: #ffffff;
    box-shadow: 0 4px 12px rgba(138, 43, 226, 0.15);
}

.chat-input-bar {
    padding: 1.2rem;
    border-top: 1px solid var(--glass-border);
    background: rgba(10, 10, 18, 0.5);
    display: flex;
    gap: 0.8rem;
    align-items: center;
}

.chat-input-field {
    flex-grow: 1;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    padding: 0.9rem 1.2rem;
    color: var(--text-main);
    font-family: inherit;
    font-size: 0.95rem;
    transition: var(--transition-fast);
}

.chat-input-field:focus {
    outline: none;
    border-color: var(--color-primary);
    background: rgba(0, 0, 0, 0.5);
}

/* ==========================================================================
   WORD BANK VIEW
   ========================================================================== */
.word-bank-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
}

.vocab-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    padding: 1.5rem;
    position: relative;
    overflow: hidden;
    transition: var(--transition-normal);
}

.vocab-card:hover {
    border-color: var(--color-teal);
    transform: translateY(-4px);
    box-shadow: 0 8px 25px rgba(0, 242, 254, 0.1);
}

.vocab-word-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.8rem;
}

.vocab-term {
    font-family: 'Plus Jakarta Sans', sans-serif;
    font-weight: 700;
    font-size: 1.3rem;
    color: var(--color-teal);
}

.vocab-ipa {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-style: italic;
}

.vocab-definition {
    font-size: 0.95rem;
    line-height: 1.5;
    margin-bottom: 0.8rem;
    color: var(--text-main);
}

.vocab-example {
    background: rgba(0, 0, 0, 0.15);
    border-left: 3px solid var(--color-primary);
    padding: 0.6rem 0.8rem;
    border-radius: 0 8px 8px 0;
    font-size: 0.85rem;
    line-height: 1.45;
    color: var(--text-muted);
}

.vocab-delete-btn {
    position: absolute;
    top: 1rem;
    right: 1rem;
    opacity: 0;
    transition: var(--transition-fast);
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
}

.vocab-card:hover .vocab-delete-btn {
    opacity: 1;
}

.vocab-delete-btn:hover {
    color: var(--color-accent);
}

.vocab-delete-btn svg {
    width: 18px;
    height: 18px;
}

/* ==========================================================================
   SETTINGS VIEW
   ========================================================================== */
.settings-layout {
    max-width: 650px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.settings-info-box {
    background: rgba(138, 43, 226, 0.06);
    border: 1px dashed rgba(138, 43, 226, 0.3);
    border-radius: 12px;
    padding: 1.2rem;
    font-size: 0.9rem;
    line-height: 1.5;
    color: #e5ccff;
}

.settings-info-box a {
    color: var(--color-teal);
    text-decoration: underline;
}

/* Toast Notification */
.toast-msg {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background: var(--gradient-primary);
    border-radius: 12px;
    padding: 1rem 1.8rem;
    box-shadow: var(--shadow-soft);
    display: flex;
    align-items: center;
    gap: 0.8rem;
    color: #ffffff;
    font-weight: 600;
    transform: translateY(100px);
    opacity: 0;
    pointer-events: none;
    transition: transform var(--transition-normal), opacity var(--transition-normal);
    z-index: 1000;
}

.toast-msg.show {
    transform: translateY(0);
    opacity: 1;
}

/* ==========================================================================
   RESPONSIVE DESIGN (Media Queries)
   ========================================================================== */
@media (max-width: 1024px) {
    .story-creator-grid {
        grid-template-columns: 1fr;
    }
    .chat-layout {
        grid-template-columns: 1fr;
        height: auto;
    }
}

@media (max-width: 768px) {
    .app-container {
        flex-direction: column;
    }
    
    .sidebar {
        width: 100%;
        border-right: none;
        border-bottom: 1px solid var(--glass-border);
        padding: 1.5rem;
    }
    
    .logo-container {
        margin-bottom: 1.5rem;
        justify-content: center;
    }
    
    .nav-menu {
        flex-direction: row;
        flex-wrap: wrap;
        justify-content: center;
        gap: 0.4rem;
    }
    
    .nav-item {
        padding: 0.6rem 1rem;
        font-size: 0.85rem;
    }
    
    .api-status-card {
        display: none;
    }
    
    .main-content {
        padding: 1.5rem;
        height: auto;
        overflow-y: visible;
    }
    
    .section-title {
        font-size: 1.8rem;
    }
    
    .card-scene {
        height: 380px;
    }
    
    .challenge-type-selector {
        grid-template-columns: 1fr;
    }
}

/* ==========================================================================
   SAVED STORIES & STORY FILTERS
   ========================================================================== */
.saved-stories-list {
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
    max-height: 250px;
    overflow-y: auto;
    padding-right: 0.2rem;
    margin-top: 0.5rem;
}

.saved-story-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 10px;
    padding: 0.6rem 0.8rem;
    cursor: pointer;
    transition: var(--transition-fast);
    gap: 0.5rem;
}

.saved-story-item:hover {
    background: rgba(138, 43, 226, 0.1);
    border-color: rgba(138, 43, 226, 0.25);
    transform: translateX(2px);
}

.saved-story-info {
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
    flex-grow: 1;
    overflow: hidden;
}

.saved-story-title-text {
    font-size: 0.9rem;
    font-weight: 600;
    color: #ffffff;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.saved-story-meta-text {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.btn-delete-story, .btn-delete-reader {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: transparent;
    border: 1px solid transparent;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition-fast);
    flex-shrink: 0;
}

.btn-delete-story:hover, .btn-delete-reader:hover {
    color: var(--color-accent);
    background: rgba(255, 0, 127, 0.12);
    border-color: rgba(255, 0, 127, 0.2);
    transform: scale(1.05);
}

.btn-delete-story svg, .btn-delete-reader svg {
    width: 14px;
    height: 14px;
    stroke: currentColor;
    stroke-width: 2.5;
    fill: none;
}

/* Save button styling inside header */
#btn-save-story.saved, #btn-save-reader.saved, #btn-reader-save-all.saved {
    background: rgba(255, 0, 127, 0.15);
    border-color: rgba(255, 0, 127, 0.3);
    color: var(--color-accent);
}

#btn-save-story.saved svg, #btn-save-reader.saved svg, #btn-reader-save-all.saved svg {
    fill: currentColor;
}

/* Phrase Breakdown Styling */
.phrase-tag {
    background: rgba(255, 0, 127, 0.08);
    border: 1px solid rgba(255, 0, 127, 0.2);
    border-radius: 6px;
    padding: 0.2rem 0.5rem;
    font-size: 0.8rem;
    color: #ffd1e6;
    display: inline-block;
    margin: 0.1rem;
    transition: var(--transition-fast);
}

.phrase-tag:hover {
    background: rgba(255, 0, 127, 0.15);
    border-color: rgba(255, 0, 127, 0.35);
    transform: translateY(-1px);
}

/* User profile details adjustments */
.user-stats-card {
    transition: var(--transition-normal);
}

.user-stats-card:hover {
    background: rgba(255, 255, 255, 0.06) !important;
    border-color: rgba(255, 255, 255, 0.12) !important;
}