:root {
    --bg-color: #FDFBF7;
    --text-color: #4A4A4A;
    --primary-pastel: #B5EAD7;
    --primary-dark: #569E7E;
    --secondary-pastel: #C7CEEA;
    --secondary-dark: #5F6B9E;

    --left-ear-color: #1E88E5;
    /* Standard audiogram Blue */
    --left-ear-pastel: #A2D2FF;
    --right-ear-color: #E53935;
    /* Standard audiogram Red */
    --right-ear-pastel: #FFC8DD;

    --card-bg: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(255, 255, 255, 0.5);
    --shadow: 0 8px 32px 0 rgba(74, 74, 74, 0.05);

    --font-main: 'Outfit', sans-serif;
}

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

body {
    font-family: var(--font-main);
    background-color: var(--bg-color);
    color: var(--text-color);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background-image:
        radial-gradient(at 10% 10%, var(--secondary-pastel) 0px, transparent 50%),
        radial-gradient(at 90% 90%, var(--primary-pastel) 0px, transparent 50%);
    background-attachment: fixed;
}

.app-container {
    width: 100%;
    max-width: 800px;
    padding: 20px;
    text-align: center;
}

header {
    margin-bottom: 30px;
}

header h1 {
    font-weight: 600;
    font-size: 2.5rem;
    color: var(--secondary-dark);
    letter-spacing: -1px;
    margin-bottom: 10px;
}

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

.screen {
    opacity: 0;
    pointer-events: none;
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    transform: translateY(20px);
    transition: opacity 0.5s ease, transform 0.5s ease;
    display: none;
    /* Hide completely when not active to prevent overlap issues */
}

.screen.active {
    opacity: 1;
    pointer-events: auto;
    position: relative;
    transform: translateY(0);
    display: block;
}

.hidden {
    display: none;
}

.card {
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    padding: 40px;
    box-shadow: var(--shadow);
}

h2 {
    color: var(--primary-dark);
    margin-bottom: 20px;
}

h3 {
    color: var(--secondary-dark);
    margin-bottom: 15px;
    font-size: 1.2rem;
}

ul {
    list-style-type: none;
    text-align: left;
    margin-bottom: 30px;
    background: rgba(255, 255, 255, 0.5);
    padding: 20px;
    border-radius: 16px;
}

li {
    margin-bottom: 12px;
    line-height: 1.5;
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 15px;
    align-items: start;
    text-align: left;
}

li span:first-child {
    font-size: 1.2rem;
}

.disclaimer-box {
    margin-top: 30px;
    padding: 15px;
    background: rgba(255, 235, 59, 0.2);
    border: 1px solid rgba(255, 235, 59, 0.5);
    border-radius: 12px;
    color: var(--text-color);
    font-size: 0.9rem;
    line-height: 1.4;
    text-align: center;
}

.disclaimer-box strong {
    color: #F57F17;
}

.controls-info {
    display: flex;
    justify-content: center;
    gap: 30px;
    margin-bottom: 30px;
}

.key-hint {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}

.key {
    display: inline-flex;
    justify-content: center;
    align-items: center;
    width: 50px;
    height: 50px;
    background: white;
    border-radius: 12px;
    font-weight: 600;
    font-size: 1.2rem;
    color: var(--secondary-dark);
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
    border: 2px solid var(--secondary-pastel);
    transition: transform 0.1s;
}

.key-hint:nth-child(1) .key {
    border-color: var(--left-ear-pastel);
    color: var(--left-ear-color);
}

.key-hint:nth-child(2) .key {
    border-color: var(--right-ear-pastel);
    color: var(--right-ear-color);
}

.btn-primary {
    background: var(--secondary-dark);
    color: white;
    border: none;
    padding: 15px 40px;
    border-radius: 50px;
    font-size: 1.1rem;
    font-weight: 600;
    font-family: var(--font-main);
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    box-shadow: 0 4px 15px rgba(95, 107, 158, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(95, 107, 158, 0.4);
}

.btn-secondary {
    background: transparent;
    border: 2px solid var(--text-color);
    color: var(--text-color);
    padding: 10px 30px;
    border-radius: 50px;
    cursor: pointer;
    margin-top: 20px;
    opacity: 0.6;
    transition: opacity 0.2s;
}

.btn-secondary:hover {
    opacity: 1;
}

/* Timer */
.timer-section {
    margin-bottom: 30px;
}

#countdown-timer {
    font-size: 8rem;
    font-weight: 700;
    color: var(--secondary-dark);
    font-variant-numeric: tabular-nums;
    line-height: 1;
    text-shadow: 2px 2px 10px rgba(0, 0, 0, 0.1);
}

.timer-label {
    font-size: 1.2rem;
    text-transform: uppercase;
    letter-spacing: 2px;
    opacity: 0.8;
    margin-top: 10px;
    font-weight: 600;
}

/* Big Visual Feedback */
.huge-icon {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    opacity: 0.5;
    /* Always visible but dimmed */
    transition: opacity 0.2s, transform 0.2s;
    background: rgba(255, 255, 255, 0.9);
    padding: 30px;
    border-radius: 40px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
    transform: scale(0.9);
    position: relative;
    /* Changed from absolute to flow in flex */
}

.huge-icon svg {
    width: 150px;
    /* Reduced size slightly to fit side-by-side */
    height: 150px;
    margin-bottom: 20px;
}

.huge-icon span {
    font-size: 1.5rem;
    font-weight: 800;
    text-transform: uppercase;
}

.huge-icon.left {
    color: var(--left-ear-color);
    border: 5px solid var(--left-ear-pastel);
}

.huge-icon.right {
    color: var(--right-ear-color);
    border: 5px solid var(--right-ear-pastel);
}

.huge-icon.visible {
    opacity: 1;
    transform: scale(1.05);
    box-shadow: 0 15px 50px rgba(0, 0, 0, 0.15);
}

/* Ensure container allows side-by-side*/
.feedback-overlay {
    position: relative;
    /* Changed from absolute covering all */
    height: auto;
    width: 100%;
    margin-bottom: 30px;
    pointer-events: none;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 40px;
    /* Space between ears */
    z-index: 10;
}

/* New Buttons */
.action-buttons {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
    margin-top: 40px;
}

.btn-primary-outline {
    background: transparent;
    color: var(--secondary-dark);
    border: 2px solid var(--secondary-dark);
    padding: 12px 35px;
    border-radius: 50px;
    font-size: 1rem;
    font-weight: 600;
    font-family: var(--font-main);
    cursor: pointer;
    transition: all 0.2s;
}

.btn-primary-outline:hover {
    background: var(--secondary-dark);
    color: white;
}

/* Test Screen */
.test-interface {
    text-align: center;
}

.status-bar {
    display: flex;
    justify-content: space-between;
    margin-bottom: 40px;
    background: white;
    padding: 15px 25px;
    border-radius: 20px;
    box-shadow: var(--shadow);
}

.frequency-display {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.frequency-display .label {
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    opacity: 0.6;
}

.frequency-display .value {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--primary-dark);
}

.ear-indicator {
    display: flex;
    align-items: center;
    font-weight: 600;
    color: var(--left-ear-color);
}

.ear-indicator[data-ear="right"] {
    color: var(--right-ear-color);
}

.visualizer {
    height: 200px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    position: relative;
}

.wave-container {
    display: flex;
    gap: 10px;
    align-items: center;
    height: 60px;
}

.wave {
    width: 6px;
    height: 20px;
    background: var(--secondary-pastel);
    border-radius: 10px;
    animation: wave 1s infinite ease-in-out;
}

.wave:nth-child(2) {
    animation-delay: 0.1s;
}

.wave:nth-child(3) {
    animation-delay: 0.2s;
}

@keyframes wave {

    0%,
    100% {
        height: 20px;
    }

    50% {
        height: 50px;
        background: var(--secondary-dark);
    }
}

.listening-feedback {
    margin-top: 20px;
    font-style: italic;
    opacity: 0;
    transition: opacity 0.3s;
}

.listening-feedback.active {
    opacity: 1;
}

.controls-reminder {
    margin-top: 40px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

/* Results Screen */
.results-card {
    max-width: 900px;
}

.chart-container {
    background: white;
    padding: 20px;
    border-radius: 16px;
    margin: 20px 0;
    position: relative;
    height: 400px;
    width: 100%;
}

.results-summary {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 30px;
    text-align: left;
}

.ear-result {
    padding: 20px;
    border-radius: 16px;
    background: rgba(255, 255, 255, 0.5);
}

.ear-result.left h3 {
    color: var(--left-ear-color);
}

.ear-result.right h3 {
    color: var(--right-ear-color);
}

footer {
    margin-top: 50px;
    font-size: 0.9rem;
    opacity: 0.5;
}

/* Animations fo key press */
.key.pressed {
    transform: scale(0.95);
    background: var(--secondary-pastel);
    color: white;
    border-color: var(--secondary-dark);
}