/* Base Variables and Color Palette */
:root {
    --bg-dark: #06141B;
    --bg-navy: #11212D;
    --bg-navy-light: #253745;
    --accent-slate: #4A5C6A;
    --text-muted: #9BA8AB;
    --text-light: #CCD0CF;
    
    /* Gradient Palette based on images */
    --gradient-start: #1A1F2C;
    --gradient-end: #0C1017;

    /* Glassmorphism settings */
    --glass-bg: rgba(17, 33, 45, 0.6);
    --glass-border: rgba(255, 255, 255, 0.05);
    --glass-highlight: rgba(255, 255, 255, 0.1);
    --glass-blur: blur(20px);
    
    /* Finger Highlight Colors */
    --highlight-color: rgba(155, 168, 171, 0.4);
    --active-key-color: rgba(204, 208, 207, 0.3);
    --error-color: rgba(220, 80, 80, 0.4);
    
    /* Finger Color Coding (High Contrast Adjacency) */
    --c-l-pinky: 255, 150, 0;        /* Neon Orange */
    --c-l-ring: 50, 150, 255;        /* Neon Blue */
    --c-l-middle: 255, 255, 0;       /* Neon Yellow */
    --c-l-index: 150, 50, 255;       /* Neon Purple */
    --c-thumb: 50, 255, 50;          /* Neon Green */
    --c-r-index: 255, 50, 50;        /* Neon Red */
    --c-r-middle: 0, 255, 255;       /* Neon Cyan */
    --c-r-ring: 255, 50, 255;        /* Neon Magenta */
    --c-r-pinky: 100, 255, 200;      /* Neon Mint */
}

/* Finger Data Mappings */
[data-finger="l-pinky"] { --finger-color: var(--c-l-pinky); }
[data-finger="l-ring"] { --finger-color: var(--c-l-ring); }
[data-finger="l-middle"] { --finger-color: var(--c-l-middle); }
[data-finger="l-index"] { --finger-color: var(--c-l-index); }
[data-finger="l-thumb"], [data-finger="r-thumb"] { --finger-color: var(--c-thumb); }
[data-finger="r-index"] { --finger-color: var(--c-r-index); }
[data-finger="r-middle"] { --finger-color: var(--c-r-middle); }
[data-finger="r-ring"] { --finger-color: var(--c-r-ring); }
[data-finger="r-pinky"] { --finger-color: var(--c-r-pinky); }

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

body {
    font-family: 'Outfit', sans-serif;
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    background-attachment: fixed;
    color: var(--text-light);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
}

.app-container {
    width: 100%;
    max-width: 1300px;
    padding: 2rem;
    display: flex;
    flex-direction: row;
    gap: 2rem;
    height: 90vh; /* Better fit for sidebar */
}

.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 2rem;
    height: 100%;
}

/* Sidebar Styles */
.sidebar {
    width: 280px;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    height: 100%;
}

.lesson-scroll-area {
    flex: 1;
    overflow-y: auto;
    margin-bottom: 1rem;
    padding-right: 0.5rem;
}

.lesson-scroll-area::-webkit-scrollbar {
    width: 6px;
}
.lesson-scroll-area::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 3px;
}
.lesson-scroll-area::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.2);
    border-radius: 3px;
}
.lesson-scroll-area::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.3);
}

.sidebar h2 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    color: #fff;
    font-weight: 600;
}

#lesson-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
}

#lesson-list li {
    padding: 1rem;
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.05);
    cursor: pointer;
    transition: all 0.2s ease;
    border: 1px solid rgba(255, 255, 255, 0.05);
    font-size: 0.95rem;
    color: #cbd5e1;
}

#lesson-list li:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateX(4px);
}

#lesson-list li.active {
    background: rgba(255, 255, 255, 0.15);
    border-color: rgba(255, 255, 255, 0.3);
    color: #fff;
    font-weight: 500;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

#lesson-list li.completed {
    opacity: 0.6;
}

/* Glassmorphism Utility */
.glass-panel {
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    box-shadow: 0 8px 32px 0 rgba(6, 20, 27, 0.4);
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 2.5rem;
    text-align: left;
}

header h1 {
    font-size: 2.5rem;
    font-weight: 600;
    letter-spacing: 2px;
    margin-bottom: 0.2rem;
    color: #fff;
    text-shadow: 0 0 15px rgba(255, 255, 255, 0.2);
}

header p {
    color: var(--text-light);
    font-size: 1.1rem;
    font-weight: 300;
    opacity: 0.8;
}

.guide-btn {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: #fff;
    padding: 0.8rem 1.5rem;
    border-radius: 12px;
    font-family: inherit;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.3s ease;
    backdrop-filter: blur(5px);
    box-shadow: 0 4px 15px rgba(6, 20, 27, 0.2);
}

.guide-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.4);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(6, 20, 27, 0.4);
}

.guide-btn:active {
    transform: translateY(0);
}

.text-display {
    padding: 3rem 4rem;
    margin-bottom: 2rem;
    text-align: left;
    min-height: 180px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    position: relative;
    overflow: hidden;
    /* Glass bright reflection */
    border: 2px solid rgba(255, 255, 255, 0.2);
    border-top: 2px solid rgba(255, 255, 255, 0.4);
    box-shadow: 0 15px 35px rgba(0,0,0,0.5), inset 0 2px 20px rgba(255, 255, 255, 0.15);
}

.start-lesson-overlay {
    position: absolute;
    inset: 0;
    background: rgba(6, 20, 27, 0.7);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10;
    transition: opacity 0.3s ease;
}

.start-lesson-overlay.hidden {
    opacity: 0;
    pointer-events: none;
}

.start-lesson-overlay .primary-btn {
    width: auto;
    padding: 1rem 3rem;
    font-size: 1.2rem;
    background: rgba(255, 255, 255, 0.15);
    border: 2px solid rgba(255, 255, 255, 0.3);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
}

.pulse {
    animation: pulseGlow 2s infinite cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes pulseGlow {
    0% { box-shadow: 0 0 0 0 rgba(255, 255, 255, 0.2); }
    70% { box-shadow: 0 0 0 15px rgba(255, 255, 255, 0); }
    100% { box-shadow: 0 0 0 0 rgba(255, 255, 255, 0); }
}

.text-display::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    border-radius: 16px;
    background: linear-gradient(135deg, rgba(255,255,255,0.1) 0%, rgba(255,255,255,0) 40%, rgba(255,255,255,0) 100%);
    box-shadow: 0 15px 35px rgba(6, 20, 27, 0.6), inset 0 2px 20px rgba(255, 255, 255, 0.15);
    pointer-events: none;
    z-index: 0;
}

.text-wrapper, .finger-hint, .stats {
    position: relative;
    z-index: 1;
}

.text-wrapper {
    font-size: 2.8rem;
    letter-spacing: 2px;
    margin-bottom: 2rem;
    font-weight: 500;
    max-height: 180px;
    overflow-y: hidden;
    scroll-behavior: smooth;
    line-height: 1.4;
    padding: 10px;
    text-align: center;
    white-space: pre-wrap;
    word-break: break-word;
}

.completed {
    color: var(--text-muted);
    opacity: 0.5;
}

.current {
    color: #fff;
    background: rgba(255, 255, 255, 0.15);
    border-radius: 4px;
    padding: 0 2px;
    border-bottom: 3px solid #fff;
    animation: pulse 1s infinite alternate;
    text-shadow: 0 0 10px #fff;
}

.current.error {
    border-bottom: 2px solid #ff6b6b;
    color: #ff6b6b;
    background: rgba(255, 107, 107, 0.1);
}

.remaining {
    color: var(--text-light);
}

.finger-hint {
    color: var(--text-light);
    font-size: 1.1rem;
    font-weight: 600;
    min-height: 1.6rem;
    margin: 0.5rem 0;
    text-transform: uppercase;
    letter-spacing: 2px;
    opacity: 0.9;
    background: rgba(255, 255, 255, 0.05);
    padding: 4px 16px;
    border-radius: 20px;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.stats {
    display: flex;
    gap: 2rem;
    font-size: 1rem;
    color: var(--text-muted);
    font-family: 'Outfit', sans-serif;
}

/* Keyboard Area */
.keyboard-area {
    position: relative;
    margin-top: 1rem;
}

.virtual-keyboard {
    padding: 2rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    align-items: center;
}

.keyboard-row {
    display: flex;
    gap: 0.5rem;
    justify-content: center;
}

.key {
    background: linear-gradient(135deg, rgba(255,255,255,0.05) 0%, rgba(6, 20, 27, 0.9) 100%);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-top: 1px solid rgba(255, 255, 255, 0.3); /* glossy edge */
    border-radius: 8px;
    color: rgba(255, 255, 255, 0.9);
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.4rem;
    font-family: 'Outfit', sans-serif;
    font-weight: 500;
    min-width: 3.5rem;
    height: 3.5rem;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    user-select: none;
    box-shadow: 0 8px 15px rgba(6, 20, 27, 0.7);
    position: relative;
}

.key[data-finger] {
    background: linear-gradient(135deg, rgba(255,255,255,0.05) 0%, rgba(var(--finger-color), 0.15) 100%);
    border-bottom: 2px solid rgba(var(--finger-color), 0.7);
    box-shadow: 
        inset 0 -2px 5px rgba(var(--finger-color), 0.3),
        0 8px 15px rgba(var(--finger-color), 0.2);
}

.key.special {
    font-size: 0.8rem;
    font-family: 'Outfit', sans-serif;
    color: var(--text-light);
}

.key.highlight {
    background: linear-gradient(135deg, rgba(var(--finger-color), 0.6) 0%, rgba(var(--finger-color), 0.1) 100%);
    color: #fff;
    border: 1px solid rgba(255, 255, 255, 0.8);
    border-bottom: 3px solid rgb(var(--finger-color));
    box-shadow: 
        inset 0 0 20px rgba(var(--finger-color), 0.8),
        0 10px 30px rgba(var(--finger-color), 0.6),
        0 20px 60px rgba(var(--finger-color), 0.4);
    transform: translateY(-2px);
    z-index: 10;
    text-shadow: 0 0 5px rgba(255, 255, 255, 0.8);
    font-weight: bold;
}

.key.pressed {
    transform: scale(0.95);
    border-bottom: 2px solid rgb(var(--finger-color));
    box-shadow: 0 0 10px rgb(var(--finger-color)), inset 0 0 10px rgba(6, 20, 27, 0.6);
    transform: translateY(2px);
}

/* Specific Key Widths */
.key[data-key="Backspace"] { width: 6rem; }
.key[data-key="Tab"] { width: 5rem; }
.key[data-key="\\"] { width: 4.5rem; }
.key[data-key="CapsLock"] { width: 6rem; }
.key[data-key="Enter"] { width: 7rem; }
.key[data-key="ShiftLeft"] { width: 8rem; }
.key[data-key="ShiftRight"] { width: 8.5rem; }
.key[data-key="Space"] { width: 22rem; }

/* Hands / Finger Guides */
.hands-overlay {
    position: absolute;
    bottom: -4rem; /* Extend slightly out of keyboard */
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    display: flex;
    justify-content: space-between;
    padding: 0 4rem;
    z-index: 10;
    opacity: 0.8;
}

.hand {
    display: flex;
    gap: 0.8rem;
    align-items: flex-end;
    height: 100%;
    padding-bottom: 2rem;
}

/* Approximating finger positions visually */
.finger {
    width: 2.5rem;
    background: linear-gradient(135deg, rgba(var(--finger-color, 155, 168, 171), 0.4) 0%, rgba(var(--finger-color, 155, 168, 171), 0.1) 100%);
    border: 1px solid rgba(var(--finger-color, 255, 255, 255), 0.7);
    border-top: 2px solid rgba(255, 255, 255, 0.5); /* Shiny top */
    border-radius: 20px;
    backdrop-filter: blur(4px);
    transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1); /* Bouncy spring effect */
    box-shadow: 0 10px 20px rgba(var(--finger-color, 6, 20, 27), 0.3);
    transform: translate(var(--move-x, 0px), var(--move-y, 0px));
    z-index: 1;
}

/* Finger heights */
.pinky { height: 6rem; }
.ring { height: 7.5rem; }
.middle { height: 8.5rem; }
.index { height: 7.5rem; }
.thumb { 
    height: 4.5rem; 
    transform-origin: bottom center; 
    transform: translate(var(--move-x, 0px), var(--move-y, 0px)) rotate(-30deg) translateX(1rem); 
}
.right-hand .thumb { 
    transform: translate(var(--move-x, 0px), var(--move-y, 0px)) rotate(30deg) translateX(-1rem); 
}

/* Finger Highlight State */
.finger.active {
    background: linear-gradient(135deg, rgb(var(--finger-color)) 0%, rgba(var(--finger-color), 0.6) 100%);
    border: 1px solid #fff;
    box-shadow: 
        0 10px 30px rgba(var(--finger-color), 0.8),
        0 20px 60px rgba(var(--finger-color), 0.6);
    z-index: 100;
}



/* Tooltip on active finger */
.finger.active::after,
.hands-overlay.tutorial-mode .finger::after {
    opacity: 1;
    transform: translate(-50%, 10px);
}

.finger::after {
    content: attr(data-name);
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translate(-50%, 0px);
    background: #fff;
    color: #000;
    padding: 4px 10px;
    border-radius: 6px;
    font-size: 0.85rem;
    font-weight: 700;
    white-space: nowrap;
    opacity: 0;
    transition: opacity 0.2s ease, transform 0.2s ease;
    pointer-events: none;
    z-index: 1000;
    box-shadow: 0 4px 10px rgba(6, 20, 27, 0.4);
}

/* Custom Lesson Sidebar Styles */
.custom-lesson-box {
    margin-top: auto;
    padding-top: 1.5rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.custom-lesson-box h3 {
    font-size: 1rem;
    color: #cbd5e1;
    margin-bottom: 0.8rem;
}

#custom-lesson-text {
    width: 100%;
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    padding: 0.8rem;
    color: #fff;
    font-family: inherit;
    resize: none;
    margin-bottom: 0.8rem;
}

#custom-lesson-text:focus {
    outline: none;
    border-color: rgba(255, 255, 255, 0.3);
}

.primary-btn {
    width: 100%;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    padding: 0.8rem;
    border-radius: 8px;
    color: #fff;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

.primary-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-1px);
}

.finger.active::after {
    opacity: 1;
}

/* Modals */
.modal {
    position: fixed;
    inset: 0;
    background: rgba(6, 20, 27, 0.7);
    backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    transition: opacity 0.3s ease;
}

.modal.hidden {
    opacity: 0;
    pointer-events: none;
}

.modal-content {
    padding: 2.5rem;
    max-width: 450px;
    text-align: center;
    animation: modalPop 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.modal-content h2 {
    color: #fff;
    margin-bottom: 1rem;
    font-size: 1.8rem;
}

.modal-content p {
    color: #cbd5e1;
    margin-bottom: 2rem;
    line-height: 1.5;
}

.modal-buttons {
    display: flex;
    gap: 1rem;
}

.secondary-btn {
    flex: 1;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    padding: 0.8rem;
    border-radius: 8px;
    color: #cbd5e1;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

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

@keyframes modalPop {
    0% { opacity: 0; transform: scale(0.9); }
    100% { opacity: 1; transform: scale(1); }
}

/* Sidebar Footer */
.sidebar-footer {
    margin-top: auto;
    padding-top: 1rem;
    text-align: center;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

#policy-link {
    color: #94a3b8;
    text-decoration: none;
    font-size: 0.85rem;
    transition: color 0.2s ease;
}

#policy-link:hover {
    color: #fff;
    text-decoration: underline;
}

/* Policy Modal Specifics */
.policy-content {
    max-width: 600px;
    width: 90%;
    max-height: 80vh;
    display: flex;
    flex-direction: column;
}

.policy-text {
    overflow-y: auto;
    text-align: left;
    margin-bottom: 1.5rem;
    padding-right: 10px;
}

.policy-text h3 {
    color: #fff;
    margin: 1.5rem 0 0.5rem 0;
    font-size: 1.2rem;
}

.policy-text h4 {
    color: #cbd5e1;
    margin: 1rem 0 0.25rem 0;
    font-size: 1rem;
}

.policy-text p {
    color: #94a3b8;
    font-size: 0.95rem;
    line-height: 1.6;
    margin-bottom: 0.8rem;
}

.policy-text a {
    color: #38bdf8;
    text-decoration: none;
}

.policy-text a:hover {
    text-decoration: underline;
}

/* Custom Notification Modal */
.notification-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(12, 16, 23, 0.85); /* Deep slate overlay */
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 2000;
    opacity: 1;
    visibility: visible;
    transition: all 0.3s ease;
}

.notification-modal.hidden {
    opacity: 0;
    visibility: hidden;
}

.notification-content {
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1.5px solid rgba(204, 208, 207, 0.5); /* Glowing border using --text-light */
    border-radius: 20px;
    padding: 1.2rem 2.5rem;
    display: flex;
    align-items: center;
    gap: 1.5rem;
    box-shadow: 0 0 30px rgba(155, 168, 171, 0.2), inset 0 0 15px rgba(204, 208, 207, 0.1);
    color: var(--text-light);
    font-size: 1.25rem;
    font-weight: 500;
    letter-spacing: 0.5px;
    transform: scale(1);
    transition: transform 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.notification-modal.hidden .notification-content {
    transform: scale(0.8);
}

.notification-content strong {
    color: #fff;
    background: rgba(255,255,255,0.1);
    padding: 2px 8px;
    border-radius: 4px;
    border-bottom: 2px solid var(--text-light);
}

.notification-content .icon {
    color: var(--text-light);
    font-size: 1.4rem;
    filter: drop-shadow(0 0 8px rgba(204, 208, 207, 0.6));
    animation: pulse-icon 2s infinite alternate;
}

@keyframes pulse-icon {
    from { opacity: 0.7; transform: scale(0.95); }
    to { opacity: 1; transform: scale(1.05); }
}


/* Animations */
@keyframes pulse {
    from { opacity: 0.6; }
    to { opacity: 1; }
}