/* ============================================================
   PLGR - Polish Learning App
   ✨ FULL GLASSMORPHISM REDESIGN ✨
   ============================================================ */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}


:root {
    /* Glass Effects */
    --glass-bg: rgba(255, 255, 255, 0.08);
    --glass-bg-hover: rgba(255, 255, 255, 0.12);
    --glass-bg-active: rgba(255, 255, 255, 0.06);
    --glass-border: rgba(255, 255, 255, 0.15);
    --glass-border-strong: rgba(255, 255, 255, 0.25);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.35);
    --glass-shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.45);
    --glass-highlight: inset 0 1px 0 rgba(255, 255, 255, 0.2);

    /* 🌿 FOREST MINT PALETTE */
    --ambient-1: #00b894;  /* Mint green */
    --ambient-2: #00cec9;  /* Turquoise*/
    --ambient-3: #55efc4;  /* Light green */
    --ambient-4: #00d2d3;  /* Sea blue */
    --ambient-5: #48dbfb;  /* Sky blue */

    /* Functional Colors */
    --success: #00FFCD;     /* Mint green - success */
    --danger: #FF0000;      /* Coral red - Error */
    --warning: #FFA600;     /* Gold - warning */
    --info: #00FFF9;        /* Turquoise - info */
    --info-bg: rgba(3, 108, 105, 1);
    --success-glass: rgba(0, 184, 148, 0.2);
    --danger-glass: rgba(255, 107, 107, 0.2);

    /* Text */
    --text-primary: #ffffff;
    --text-secondary: rgba(255, 255, 255, 0.8);
    --text-tertiary: rgba(255, 255, 255, 0.5);

    /* Radii */
    --radius: 20px;
    --radius-lg: 28px;
    --radius-sm: 16px;
    --radius-xs: 12px;

    /* Layout */
    --header-height: 64px;
    --nav-height: 72px;
    --blur-primary: 20px;
    --blur-card: 24px;
    --blur-nav: 28px;
}

html, body {
    height: 100%;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: #0a0a1e;
    color: var(--text-primary);
    font-size: 15px;
    line-height: 1.5;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

body {
    max-width: 480px;
    margin: 0 auto;
    padding-bottom: calc(var(--nav-height) + 24px);
    position: relative;
}

/* ============================================================
   AMBIENT BACKGROUND - ENHANCED GLASSMORPHISM BLOBS
   ============================================================ */

.ambient-bg {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: -1;
    overflow: hidden;
    background: #0a0a1e;
}

.orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(120px);
    opacity: 0.4;
    animation: orbFloat 25s ease-in-out infinite;
}

.orb-1 {
    width: 400px;
    height: 400px;
    background: var(--ambient-1);
    top: -150px;
    left: -120px;
    animation-delay: 0s;
}

.orb-2 {
    width: 320px;
    height: 320px;
    background: var(--ambient-3);
    top: 30%;
    right: -100px;
    animation-delay: -8s;
}

.orb-3 {
    width: 280px;
    height: 280px;
    background: var(--ambient-2);
    bottom: 10%;
    left: 20%;
    animation-delay: -16s;
}

@keyframes orbFloat {
    0%, 100% { transform: translate(0, 0) scale(1); }
    33% { transform: translate(30px, -30px) scale(1.1); }
    66% { transform: translate(-20px, 20px) scale(0.95); }
}

/* ============================================================
   GLASS COMPONENTS - TRUE GLASSMORPHISM
   ============================================================ */

.glass {
    background: var(--glass-bg);
    backdrop-filter: blur(var(--blur-primary)) saturate(160%);
    -webkit-backdrop-filter: blur(var(--blur-primary)) saturate(160%);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius);
    box-shadow: var(--glass-shadow), var(--glass-highlight);
}

.glass-sm {
    background: var(--glass-bg);
    backdrop-filter: blur(16px) saturate(150%);
    -webkit-backdrop-filter: blur(16px) saturate(150%);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.25), var(--glass-highlight);
}

.glass-card {
    background: var(--glass-bg);
    backdrop-filter: blur(var(--blur-card)) saturate(180%);
    -webkit-backdrop-filter: blur(var(--blur-card)) saturate(180%);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--glass-shadow-lg), var(--glass-highlight);
}

.glass-nav {
    background: rgba(255, 255, 255, 0.06);
    backdrop-filter: blur(var(--blur-nav)) saturate(180%);
    -webkit-backdrop-filter: blur(var(--blur-nav)) saturate(180%);
    border-top: 1px solid var(--glass-border);
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.3), inset 0 1px 0 rgba(255, 255, 255, 0.15);
}

.glass-btn {
    background: var(--glass-bg);
    backdrop-filter: blur(16px) saturate(160%);
    -webkit-backdrop-filter: blur(16px) saturate(160%);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2), var(--glass-highlight);
    transition: all 0.25s ease;
}

.glass-btn:hover {
    background: var(--glass-bg-hover);
    border-color: var(--glass-border-strong);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.3), var(--glass-highlight);
}

.glass-btn:active {
    background: var(--glass-bg-active);
    transform: scale(0.97);
}

.glass-track {
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid var(--glass-border);
    border-radius: 100px;
    overflow: hidden;
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.2);
}

/* ============================================================
   HEADER - ENHANCED GLASS
   ============================================================ */

.header {
    position: sticky;
    top: 0;
    z-index: 100;
    height: var(--header-height);
    margin: 12px 16px;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-radius: var(--radius-lg);
    backdrop-filter: blur(24px) saturate(170%);
    -webkit-backdrop-filter: blur(24px) saturate(170%);
}

.header-left {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-mark {
    width: 38px;
    height: 38px;
    border-radius: 100px;
    background: linear-gradient(135deg, var(--ambient-1), var(--ambient-2));
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 4px;
    color: white;
    box-shadow: 0 4px 20px rgba(102, 126, 234, 0.5), var(--glass-highlight);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.logo-text {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.3px;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

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

.stat-pill {
    display: flex;
    align-items: center;
    gap: 5px;
    padding: 6px 12px;
    border-radius: 100px;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2), var(--glass-highlight);
}

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

.stat-icon.flame {
    color: var(--warning);
    filter: drop-shadow(0 0 6px rgba(255, 149, 0, 0.6));
}

.stat-icon.check {
    color: var(--success);
    filter: drop-shadow(0 0 6px rgba(52, 199, 89, 0.6));
}

/* ============================================================
   NAVIGATION - ENHANCED GLASS BOTTOM BAR
   ============================================================ */

.nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 99;
    height: var(--nav-height);
    display: flex;
    justify-content: space-around;
    align-items: center;
    padding: 8px 12px 20px;
    max-width: 480px;
    margin: 0 auto;
    backdrop-filter: blur(28px) saturate(180%);
    -webkit-backdrop-filter: blur(28px) saturate(180%);
}

.nav-btn {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 3px;
    padding: 6px 4px;
    border: none;
    background: transparent;
    cursor: pointer;
    color: var(--text-tertiary);
    transition: all 0.25s ease;
    border-radius: var(--radius-sm);
    font-family: inherit;
}

.nav-btn:hover {
    color: var(--text-secondary);
    background: rgba(255, 255, 255, 0.06);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.nav-btn.active {
    color: var(--text-primary);
    background: rgba(102, 126, 234, 0.15);
    box-shadow: 0 0 20px rgba(102, 126, 234, 0.2), var(--glass-highlight);
    border: 1px solid rgba(102, 126, 234, 0.2);
}

.nav-btn.active .nav-icon-svg {
    color: var(--ambient-1);
    filter: drop-shadow(0 0 8px rgba(102, 126, 234, 0.8));
}

.nav-icon-svg {
    width: 22px;
    height: 22px;
    transition: all 0.25s ease;
    stroke-width: 2;
}

.nav-label {
    font-size: 10px;
    font-weight: 600;
    letter-spacing: 0.3px;
}

/* ============================================================
   CONTENT
   ============================================================ */

.content {
    padding: 8px 16px 20px;
}

.tab {
    display: none;
    animation: fadeIn 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.tab.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(12px) scale(0.98); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

/* ============================================================
   LEVEL BAR - ENHANCED GLASS SEGMENT CONTROL
   ============================================================ */

.level-bar {
    display: flex;
    gap: 6px;
    padding: 6px;
    margin-bottom: 16px;
    overflow-x: auto;
    scrollbar-width: none;
}

.level-bar::-webkit-scrollbar {
    display: none;
}

.level-pill {
    padding: 8px 20px;
    border-radius: 100px;
    border: 1px solid var(--glass-border);
    background: rgba(255, 255, 255, 0.04);
    color: var(--text-tertiary);
    font-size: 12px;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.25s ease;
    white-space: nowrap;
    font-family: inherit;
    letter-spacing: 0.5px;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.level-pill:hover {
    background: var(--glass-bg-hover);
    color: var(--text-secondary);
    border-color: var(--glass-border-strong);
    transform: translateY(-1px);
}

.level-pill.active {
    background: linear-gradient(135deg, var(--ambient-1), var(--ambient-2));
    border-color: rgba(255, 255, 255, 0.3);
    color: white;
    box-shadow: 0 8px 24px rgba(102, 126, 234, 0.5), var(--glass-highlight);
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}

/* ============================================================
   FLASHCARDS - PREMIUM GLASS CARD
   ============================================================ */

.flashcard-wrapper {
    perspective: 1200px;
    margin-bottom: 16px;
}

.fc {
    width: 100%;
    min-height: 280px;
    cursor: pointer;
    position: relative;
}

.fc-inner {
    position: relative;
    width: 100%;
    min-height: 280px;
    transition: transform 0.7s cubic-bezier(0.4, 0, 0.2, 1);
    transform-style: preserve-3d;
}

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

.fc-front, .fc-back {
    position: absolute;
    width: 100%;
    min-height: 280px;
    backface-visibility: hidden;
    padding: 32px 28px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    border-radius: var(--radius-lg);
    background: var(--glass-bg);
    backdrop-filter: blur(var(--blur-card)) saturate(180%);
    -webkit-backdrop-filter: blur(var(--blur-card)) saturate(180%);
    border: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow-lg), var(--glass-highlight);
}

.fc-back {
    transform: rotateY(180deg);
    border-color: var(--glass-border-strong);
    background: rgba(255, 255, 255, 0.1);
}

.fc-badge {
    font-size: 11px;
    font-weight: 700;
    color: var(--text-secondary);
    background: rgba(102, 126, 234, 0.2);
    padding: 4px 16px;
    border-radius: 100px;
    margin-bottom: 16px;
    letter-spacing: 1px;
    text-transform: uppercase;
    border: 1px solid rgba(102, 126, 234, 0.3);
    box-shadow: 0 2px 8px rgba(102, 126, 234, 0.2);
}

.fc-pl {
    font-size: 38px;
    font-weight: 800;
    color: var(--text-primary);
    text-align: center;
    letter-spacing: -0.5px;
    line-height: 1.2;
    margin-bottom: 8px;
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

.fc-en {
    font-size: 16px;
    color: var(--text-secondary);
    text-align: center;
    font-weight: 500;
}

.fc-hint {
    font-size: 11px;
    color: var(--text-tertiary);
    margin-top: 20px;
    letter-spacing: 1px;
    text-transform: uppercase;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 6px;
}

.hint-icon {
    width: 14px;
    height: 14px;
    opacity: 0.7;
}

.fc-back-pl {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-primary);
    text-align: center;
    margin-bottom: 6px;
}

.fc-back-en {
    font-size: 14px;
    color: var(--text-secondary);
    text-align: center;
    margin-bottom: 16px;
}

.fc-divider {
    width: 40px;
    height: 2px;
    background: linear-gradient(90deg, var(--ambient-1), var(--ambient-3));
    border-radius: 1px;
    margin: 12px 0;
    box-shadow: 0 0 10px rgba(102, 126, 234, 0.4);
}

.fc-back-info {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 15px;
}

.info-pl {
    font-weight: 700;
    color: var(--text-primary);
}

.info-sep {
    color: var(--text-tertiary);
}

.info-en {
    color: var(--text-secondary);
    font-weight: 500;
}

/* TTS Button - Enhanced Glass Circle */
.tts-btn {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    border: 1px solid var(--glass-border);
    background: var(--glass-bg);
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.25s ease;
    margin-top: 16px;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2), var(--glass-highlight);
}

.tts-btn:hover {
    background: var(--glass-bg-hover);
    border-color: var(--glass-border-strong);
    transform: scale(1.1);
    color: var(--text-primary);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.3), var(--glass-highlight);
}

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

.tts-btn.playing {
    animation: ttsPulse 1s ease-in-out infinite;
    background: var(--info-bg);
    border-color: var(--info);
    color: var(--info);
    box-shadow: 0 0 20px rgba(0, 122, 255, 0.4);
}

.tts-icon {
    width: 20px;
    height: 20px;
}

.tts-btn-back {
    margin-top: 12px;
    width: 38px;
    height: 38px;
}

.tts-btn-back .tts-icon {
    width: 18px;
    height: 18px;
}

.tts-quiz {
    margin: 0 auto 12px;
}

@keyframes ttsPulse {
    0%, 100% { box-shadow: 0 0 0 0 rgba(0, 122, 255, 0.4); }
    50% { box-shadow: 0 0 0 12px rgba(0, 122, 255, 0); }
}

/* ============================================================
   FLASHCARD ACTIONS - GLASS BUTTONS
   ============================================================ */

.fc-counter {
    text-align: center;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-tertiary);
    margin-bottom: 16px;
    letter-spacing: 0.5px;
}

.fc-actions {
    display: flex;
    gap: 12px;
    margin-bottom: 16px;
}

.action-btn-glass {
    flex: 1;
    padding: 14px 20px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--glass-border);
    font-size: 14px;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.25s ease;
    font-family: inherit;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2), var(--glass-highlight);
}

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

.btn-dont {
    background: var(--danger-glass);
    color: var(--danger);
    border-color: rgba(255, 59, 48, 0.3);
}

.btn-dont:hover {
    background: rgba(255, 59, 48, 0.25);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(255, 59, 48, 0.2), var(--glass-highlight);
    border-color: rgba(255, 59, 48, 0.4);
}

.btn-dont:active {
    transform: scale(0.97);
}

.btn-know {
    background: var(--success-glass);
    color: var(--success);
    border-color: rgba(52, 199, 89, 0.3);
}

.btn-know:hover {
    background: rgba(52, 199, 89, 0.25);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(52, 199, 89, 0.2), var(--glass-highlight);
    border-color: rgba(52, 199, 89, 0.4);
}

.btn-know:active {
    transform: scale(0.97);
}

.fc-progress-area {
    margin-bottom: 16px;
}

.progress-track {
    height: 6px;
    width: 100%;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--success), #30d158);
    border-radius: 100px;
    transition: width 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    width: 0%;
    box-shadow: 0 0 12px rgba(52, 199, 89, 0.5);
}

.progress-text {
    text-align: center;
    font-size: 12px;
    color: var(--text-tertiary);
    margin-top: 8px;
    font-weight: 500;
}

.fc-tools {
    display: flex;
    justify-content: center;
    gap: 10px;
}

.tool-btn {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--text-tertiary);
    transition: all 0.25s ease;
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2), var(--glass-highlight);
}

.tool-btn:hover {
    color: var(--text-primary);
    background: var(--glass-bg-hover);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.3), var(--glass-highlight);
    border-color: var(--glass-border-strong);
}

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

.tool-icon {
    width: 18px;
    height: 18px;
}

/* ============================================================
   QUIZ - ENHANCED GLASS COMPONENTS
   ============================================================ */

.quiz-mode-bar {
    display: flex;
    gap: 4px;
    padding: 4px;
    margin-bottom: 16px;
}

.mode-pill {
    flex: 1;
    padding: 10px 16px;
    border-radius: 100px;
    border: 1px solid var(--glass-border);
    background: rgba(255, 255, 255, 0.04);
    color: var(--text-tertiary);
    font-size: 12px;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.25s ease;
    font-family: inherit;
    letter-spacing: 0.5px;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.mode-pill:hover {
    background: var(--glass-bg-hover);
    color: var(--text-secondary);
    border-color: var(--glass-border-strong);
}

.mode-pill.active {
    background: linear-gradient(135deg, var(--ambient-2), var(--ambient-3));
    border-color: rgba(255, 255, 255, 0.3);
    color: white;
    box-shadow: 0 8px 24px rgba(118, 75, 162, 0.5), var(--glass-highlight);
}

.quiz-card {
    padding: 24px;
}

.quiz-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--glass-border);
}

.quiz-score {
    display: flex;
    align-items: baseline;
    gap: 4px;
}

.score-label {
    font-size: 12px;
    color: var(--text-tertiary);
    font-weight: 600;
    margin-right: 4px;
}

.score-val {
    font-size: 24px;
    font-weight: 800;
    color: var(--warning);
    text-shadow: 0 0 10px rgba(255, 149, 0, 0.4);
}

.score-sep {
    color: var(--text-tertiary);
    font-size: 14px;
}

.score-total {
    font-size: 14px;
    color: var(--text-tertiary);
    font-weight: 600;
}

.quiz-progress {
    font-size: 12px;
    color: var(--text-tertiary);
    font-weight: 600;
    background: var(--glass-bg);
    padding: 4px 12px;
    border-radius: 100px;
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.quiz-question {
    text-align: center;
    padding: 20px 0 24px;
}

.quiz-word {
    font-size: 32px;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 8px;
    letter-spacing: -0.5px;
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

.quiz-prompt {
    font-size: 14px;
    color: var(--text-secondary);
    font-weight: 500;
}

.quiz-options {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 16px;
}

.quiz-option {
    padding: 14px 18px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--glass-border);
    background: var(--glass-bg);
    color: var(--text-primary);
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.25s ease;
    text-align: left;
    font-family: inherit;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15), var(--glass-highlight);
}

.quiz-option:hover:not(.disabled):not(.correct):not(.wrong) {
    background: var(--glass-bg-hover);
    border-color: var(--glass-border-strong);
    transform: translateX(4px);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.25), var(--glass-highlight);
}

.quiz-option.correct {
    background: var(--success-glass);
    border-color: var(--success);
    color: var(--success);
    box-shadow: 0 0 20px rgba(52, 199, 89, 0.3), var(--glass-highlight);
}

.quiz-option.wrong {
    background: var(--danger-glass);
    border-color: var(--danger);
    color: var(--danger);
    box-shadow: 0 0 20px rgba(255, 59, 48, 0.3), var(--glass-highlight);
}

.quiz-option.disabled {
    cursor: not-allowed;
    opacity: 0.5;
}

.quiz-feedback {
    padding: 14px;
    border-radius: var(--radius-sm);
    text-align: center;
    font-weight: 700;
    font-size: 14px;
    display: none;
    margin-bottom: 14px;
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid;
    box-shadow: var(--glass-shadow), var(--glass-highlight);
}

.quiz-feedback.correct {
    display: block;
    background: var(--success-glass);
    color: var(--success);
    border-color: rgba(52, 199, 89, 0.3);
}

.quiz-feedback.wrong {
    display: block;
    background: var(--danger-glass);
    color: var(--danger);
    border-color: rgba(255, 59, 48, 0.3);
}

.quiz-next {
    width: 100%;
    padding: 14px;
    font-size: 15px;
    font-weight: 700;
    cursor: pointer;
    font-family: inherit;
    display: none;
    align-items: center;
    justify-content: center;
    gap: 8px;
    backdrop-filter: blur(16px) saturate(160%);
    -webkit-backdrop-filter: blur(16px) saturate(160%);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    background: var(--glass-bg);
    color: var(--text-primary);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2), var(--glass-highlight);
    transition: all 0.25s ease;
}

.quiz-next:hover {
    background: var(--glass-bg-hover);
    border-color: var(--glass-border-strong);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.3), var(--glass-highlight);
}

.btn-icon-inline {
    width: 18px;
    height: 18px;
}

/* ============================================================
   WORDS - GLASS LIST ITEMS
   ============================================================ */

.search-wrap {
    margin-bottom: 12px;
}

.search-box {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 16px;
    backdrop-filter: blur(16px) saturate(150%);
    -webkit-backdrop-filter: blur(16px) saturate(150%);
}

.search-icon-svg {
    width: 16px;
    height: 16px;
    color: var(--text-tertiary);
    flex-shrink: 0;
}

.search-input {
    flex: 1;
    border: none;
    background: transparent;
    color: var(--text-primary);
    font-size: 15px;
    font-family: inherit;
    outline: none;
}

.search-input::placeholder {
    color: var(--text-tertiary);
}

.word-list {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.word-item {
    display: flex;
    align-items: center;
    padding: 14px 16px;
    border-radius: var(--radius-sm);
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    transition: all 0.25s ease;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15), var(--glass-highlight);
}

.word-item:hover {
    background: var(--glass-bg-hover);
    border-color: var(--glass-border-strong);
    transform: translateX(2px);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.25), var(--glass-highlight);
}

.word-item.learned {
    opacity: 0.5;
}

.word-item.learned .word-pl {
    text-decoration: line-through;
}

.word-pl {
    font-weight: 700;
    font-size: 16px;
    color: var(--text-primary);
    min-width: 80px;
}

.word-en {
    color: var(--text-secondary);
    font-size: 14px;
    flex: 1;
    margin-left: 12px;
}

.word-tag {
    font-size: 10px;
    font-weight: 700;
    color: var(--text-tertiary);
    background: var(--glass-bg);
    padding: 3px 10px;
    border-radius: 100px;
    margin-right: 10px;
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.word-btn {
    padding: 6px 14px;
    border-radius: 100px;
    border: 1px solid var(--success);
    background: var(--success-glass);
    color: var(--success);
    font-weight: 700;
    font-size: 12px;
    cursor: pointer;
    transition: all 0.25s ease;
    font-family: inherit;
    flex-shrink: 0;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.word-btn:hover {
    background: rgba(52, 199, 89, 0.3);
    border-color: rgba(52, 199, 89, 0.5);
    box-shadow: 0 4px 16px rgba(52, 199, 89, 0.3);
}

.word-btn.done {
    background: var(--success);
    color: white;
}

/* ============================================================
   GRAMMAR - ENHANCED GLASS PANELS
   ============================================================ */

.grammar-topics {
    display: flex;
    gap: 6px;
    padding: 6px;
    margin-bottom: 14px;
    overflow-x: auto;
    scrollbar-width: none;
}

.grammar-topics::-webkit-scrollbar {
    display: none;
}

.topic-btn {
    padding: 8px 18px;
    border-radius: 100px;
    border: 1px solid var(--glass-border);
    background: rgba(255, 255, 255, 0.04);
    color: var(--text-tertiary);
    font-size: 12px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.25s ease;
    white-space: nowrap;
    font-family: inherit;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.topic-btn:hover {
    background: var(--glass-bg-hover);
    color: var(--text-secondary);
    border-color: var(--glass-border-strong);
}

.topic-btn.active {
    background: linear-gradient(135deg, var(--ambient-4), var(--ambient-5));
    border-color: rgba(255, 255, 255, 0.3);
    color: white;
    box-shadow: 0 8px 24px rgba(79, 172, 254, 0.5), var(--glass-highlight);
}

.grammar-content {
    padding: 24px;
    min-height: 200px;
    backdrop-filter: blur(var(--blur-card)) saturate(180%);
    -webkit-backdrop-filter: blur(var(--blur-card)) saturate(180%);
}

.grammar-placeholder {
    text-align: center;
    padding: 40px 0;
    color: var(--text-tertiary);
}

.grammar-placeholder h3 {
    font-size: 16px;
    font-weight: 700;
    color: var(--text-secondary);
    margin-bottom: 6px;
}

.grammar-placeholder p {
    font-size: 14px;
}

.placeholder-icon-svg {
    width: 40px;
    height: 40px;
    margin-bottom: 12px;
    opacity: 0.5;
    color: var(--text-tertiary);
}

.grammar-content h2 {
    font-size: 22px;
    font-weight: 800;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.grammar-content .intro {
    background: var(--info-bg);
    padding: 16px;
    border-radius: var(--radius-sm);
    border-left: 3px solid var(--info);
    margin-bottom: 16px;
    font-size: 14px;
    line-height: 1.7;
    color: var(--text-secondary);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.grammar-content .card {
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    padding: 16px;
    margin-bottom: 12px;
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15), var(--glass-highlight);
}

.grammar-content .card-title {
    font-weight: 700;
    font-size: 16px;
    margin-bottom: 10px;
    color: var(--text-primary);
}

.grammar-content table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
}

.grammar-content th {
    text-align: left;
    padding: 8px 8px 8px 0;
    border-bottom: 2px solid var(--glass-border);
    font-size: 11px;
    text-transform: uppercase;
    color: var(--text-tertiary);
    font-weight: 700;
    letter-spacing: 0.5px;
}

.grammar-content td {
    padding: 8px 8px 8px 0;
    border-bottom: 1px solid var(--glass-border);
    color: var(--text-secondary);
}

.grammar-content .pl {
    color: var(--info);
    font-weight: 700;
}

.grammar-content .tip {
    background: var(--success-glass);
    padding: 12px 16px;
    border-radius: var(--radius-xs);
    border-left: 3px solid var(--success);
    font-size: 13px;
    margin: 8px 0;
    color: var(--text-secondary);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.grammar-content .warn {
    background: rgba(255, 149, 0, 0.15);
    padding: 12px 16px;
    border-radius: var(--radius-xs);
    border-left: 3px solid var(--warning);
    font-size: 13px;
    margin: 8px 0;
    color: var(--text-secondary);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

/* ============================================================
   LEARNING PATH - GLASS JOURNEY MAP
   ============================================================ */

.path-hero {
    padding: 28px 24px;
    margin-bottom: 20px;
    text-align: center;
    backdrop-filter: blur(var(--blur-card)) saturate(180%);
    -webkit-backdrop-filter: blur(var(--blur-card)) saturate(180%);
}

.path-hero-title {
    font-size: 28px;
    font-weight: 800;
    margin-bottom: 20px;
    background: linear-gradient(135deg, var(--ambient-1), var(--ambient-3));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.3));
}

.path-hero-stats {
    display: flex;
    justify-content: center;
    gap: 32px;
}

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

.hero-num {
    display: block;
    font-size: 28px;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 2px;
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

.hero-label {
    font-size: 11px;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-weight: 600;
}

.path-map {
    display: flex;
    flex-direction: column;
    gap: 0;
    padding: 20px 0;
    position: relative;
}

.path-section {
    position: relative;
    padding: 20px 0;
    display: flex;
    align-items: center;
}

.path-left {
    justify-content: flex-start;
    padding-left: 24px;
}

.path-right {
    justify-content: flex-end;
    padding-right: 24px;
}

.path-connector {
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 3px;
    background: linear-gradient(to bottom, var(--ambient-1), var(--ambient-3));
    transform: translateX(-50%);
    z-index: 0;
    opacity: 0.4;
    box-shadow: 0 0 10px rgba(102, 126, 234, 0.3);
}

.path-section:first-child .path-connector {
    top: 50%;
}

.path-section:last-child .path-connector {
    bottom: 50%;
}

.path-node-wrapper {
    display: flex;
    align-items: center;
    gap: 16px;
    z-index: 1;
    position: relative;
}

.path-left .path-node-wrapper {
    flex-direction: row;
}

.path-right .path-node-wrapper {
    flex-direction: row-reverse;
}

.path-circle {
    width: 68px;
    height: 68px;
    border-radius: 50%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
    position: relative;
    box-shadow: var(--glass-shadow-lg), var(--glass-highlight);
    border: 3px solid var(--glass-border);
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
}

.path-circle:hover {
    transform: scale(1.15);
    box-shadow: 0 16px 40px rgba(0, 0, 0, 0.5), var(--glass-highlight);
}

.path-circle:active {
    transform: scale(0.95);
}

.path-node-complete {
    border-color: var(--success) !important;
    background: var(--success-glass) !important;
    animation: pathGlow 2s ease-in-out infinite;
}

.path-node-progress {
    border-color: var(--warning) !important;
    background: rgba(255, 149, 0, 0.15) !important;
}

.path-node-locked {
    border-color: var(--glass-border) !important;
    background: rgba(255, 255, 255, 0.04) !important;
    opacity: 0.6;
}

.path-icon {
    font-size: 22px;
    line-height: 1;
}

.path-stars {
    font-size: 9px;
    margin-top: 1px;
    letter-spacing: -1px;
}

.path-info {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    padding: 12px 16px;
    box-shadow: var(--glass-shadow), var(--glass-highlight);
    min-width: 170px;
}

.path-level-name {
    font-size: 14px;
    font-weight: 700;
    margin-bottom: 3px;
}

.path-level-stats {
    font-size: 11px;
    color: var(--text-tertiary);
    margin-bottom: 8px;
}

.path-mini-bar {
    width: 100%;
    height: 5px;
    background: rgba(255, 255, 255, 0.08);
    border-radius: 100px;
    overflow: hidden;
    margin-bottom: 4px;
}

.path-mini-fill {
    height: 100%;
    border-radius: 100px;
    transition: width 0.8s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 0 8px currentColor;
}

.path-pct-text {
    font-size: 11px;
    font-weight: 700;
    color: var(--text-tertiary);
}

@keyframes pathGlow {
    0%, 100% { box-shadow: 0 0 0 0 rgba(52, 199, 89, 0.3); }
    50% { box-shadow: 0 0 0 15px rgba(52, 199, 89, 0); }
}

/* ============================================================
   RESET BUTTON
   ============================================================ */

.reset-btn {
    width: 100%;
    padding: 14px;
    border: 1px solid rgba(255, 59, 48, 0.3);
    border-radius: var(--radius-sm);
    background: var(--danger-glass);
    color: var(--danger);
    font-size: 14px;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.25s ease;
    font-family: inherit;
    margin-top: 20px;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2), var(--glass-highlight);
}

.reset-btn:hover {
    background: var(--danger);
    color: white;
    box-shadow: 0 8px 24px rgba(255, 59, 48, 0.3), var(--glass-highlight);
    border-color: var(--danger);
}

/* ============================================================
   EMPTY STATE
   ============================================================ */

.empty-state {
    text-align: center;
    padding: 50px 20px;
    color: var(--text-tertiary);
    font-size: 15px;
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius);
    box-shadow: var(--glass-shadow), var(--glass-highlight);
}

/* ============================================================
   ACCESSIBILITY - REDUCED TRANSPARENCY FALLBACK
   ============================================================ */

@media (prefers-reduced-transparency: reduce) {
    .glass, .glass-sm, .glass-card, .glass-nav, .glass-btn, .glass-track {
        backdrop-filter: blur(4px) saturate(120%) !important;
        -webkit-backdrop-filter: blur(4px) saturate(120%) !important;
        background: rgba(255, 255, 255, 0.12) !important;
    }
}

/* ============================================================
   PERFORMANCE - LOW POWER DEVICES
   ============================================================ */

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

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

@media (max-width: 480px) {
    .fc-pl { font-size: 32px; }
    .fc-en { font-size: 15px; }
    .quiz-word { font-size: 28px; }
    .path-circle { width: 56px; height: 56px; }
    .path-icon { font-size: 18px; }
    .path-info { min-width: 140px; padding: 10px 12px; }
    .path-level-name { font-size: 12px; }
    .path-level-stats { font-size: 10px; }
    .hero-num { font-size: 24px; }
}

@media (max-width: 380px) {
    .path-circle { width: 48px; height: 48px; }
    .path-icon { font-size: 16px; }
    .path-info { min-width: 120px; }
    .fc-pl { font-size: 28px; }
}