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

:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --secondary-color: #dc2626;
    --secondary-hover: #b91c1c;
    --tertiary-color: #059669;
    --tertiary-hover: #047857;
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --text-color: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    min-height: 100vh;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem;
}

/* Header */
header {
    text-align: center;
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 2px solid var(--border-color);
}

header h1 {
    font-size: clamp(1.5rem, 5vw, 2.5rem);
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.subtitle {
    font-size: clamp(0.9rem, 3vw, 1.1rem);
    color: var(--text-secondary);
}

/* Sections */
section {
    background-color: var(--card-bg);
    border-radius: 12px;
    padding: clamp(1rem, 3vw, 2rem);
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow);
}

section h2 {
    font-size: clamp(1.2rem, 4vw, 1.5rem);
    margin-bottom: 1.5rem;
    color: var(--text-color);
    border-bottom: 2px solid var(--primary-color);
    padding-bottom: 0.5rem;
}

/* Selection Grid */
.selection-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

/* Form Groups */
.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-color);
    font-size: clamp(0.9rem, 2.5vw, 1rem);
}

.form-group.full-width {
    grid-column: 1 / -1;
}

.participant-input {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: clamp(0.9rem, 2.5vw, 1rem);
    font-family: inherit;
    transition: all 0.3s ease;
    background: white;
}

.participant-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.participant-input::placeholder {
    color: var(--text-secondary);
}

.custom-noise-input-wrapper {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
}

.custom-noise-input {
    flex: 1;
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    font-family: 'Courier New', monospace;
    font-weight: 600;
    transition: all 0.3s ease;
    background: white;
}

.custom-noise-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.custom-noise-suffix {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--primary-color);
}

.input-hint {
    display: block;
    color: var(--text-secondary);
    font-size: 0.85rem;
    font-style: italic;
}

.audio-selector {
    width: 100%;
    padding: 0.75rem;
    font-size: clamp(0.9rem, 2.5vw, 1rem);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    background-color: var(--card-bg);
    color: var(--text-color);
    cursor: pointer;
    transition: border-color 0.3s ease;
}

.audio-selector:focus {
    outline: none;
    border-color: var(--primary-color);
}

.audio-selector:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Progress Info */
.preview-info {
    margin-bottom: 1.5rem;
}

.progress-text {
    font-size: clamp(1rem, 3vw, 1.2rem);
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.progress-bar {
    width: 100%;
    height: 24px;
    background-color: var(--border-color);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.1);
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--tertiary-color));
    width: 0%;
    transition: width 0.3s ease;
    border-radius: 12px;
}

/* Timer Display */
.timer-display {
    text-align: center;
    padding: 1.5rem;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
}

.timer-display h3 {
    color: white;
    margin-bottom: 0.5rem;
    font-size: clamp(1rem, 3vw, 1.2rem);
}

.timer-text {
    font-size: clamp(2rem, 8vw, 3rem);
    font-weight: bold;
    color: white;
    font-family: 'Courier New', monospace;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: clamp(0.75rem, 2vw, 1rem) clamp(1.5rem, 4vw, 2rem);
    font-size: clamp(0.9rem, 2.5vw, 1rem);
    font-weight: 600;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: var(--shadow);
}

.btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn:active:not(:disabled) {
    transform: translateY(0);
}

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

.btn-primary {
    background-color: var(--primary-color);
    color: white;
}

.btn-primary:hover:not(:disabled) {
    background-color: var(--primary-hover);
}

.btn-secondary {
    background-color: var(--secondary-color);
    color: white;
}

.btn-secondary:hover:not(:disabled) {
    background-color: var(--secondary-hover);
}

.btn-tertiary {
    background-color: var(--tertiary-color);
    color: white;
}

.btn-tertiary:hover:not(:disabled) {
    background-color: var(--tertiary-hover);
}

.btn-large {
    width: 100%;
    padding: 1.25rem 2rem;
    font-size: clamp(1rem, 3vw, 1.2rem);
}

.btn-copy {
    background-color: #8b5cf6;
    color: white;
}

.btn-copy:hover:not(:disabled) {
    background-color: #7c3aed;
}

.btn svg {
    width: 20px;
    height: 20px;
}

/* Results */
.results-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.results-header h2 {
    margin: 0;
    border: none;
    padding: 0;
}

.word-times {
    max-height: 400px;
    overflow-y: auto;
    padding: 1rem;
    background-color: var(--bg-color);
    border-radius: 8px;
}

.word-times::-webkit-scrollbar {
    width: 8px;
}

.word-times::-webkit-scrollbar-track {
    background: var(--border-color);
    border-radius: 4px;
}

.word-times::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 4px;
}

.word-time-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem;
    margin-bottom: 0.5rem;
    background-color: var(--card-bg);
    border-radius: 6px;
    border-left: 4px solid var(--primary-color);
    box-shadow: var(--shadow);
    flex-wrap: wrap;
}

.word-time-item .word-number {
    font-weight: 600;
    color: var(--primary-color);
    font-size: clamp(0.9rem, 2.5vw, 1rem);
}

.word-time-item .word-time {
    font-family: 'Courier New', monospace;
    font-weight: 600;
    color: var(--text-color);
    font-size: clamp(0.9rem, 2.5vw, 1rem);
}

.correct-icon {
    color: #10b981;
    font-weight: bold;
    margin-left: 0.5rem;
}

.incorrect-icon {
    color: #ef4444;
    font-weight: bold;
    margin-left: 0.5rem;
}

.no-data {
    text-align: center;
    color: var(--text-secondary);
    font-style: italic;
    padding: 2rem;
    font-size: clamp(0.9rem, 2.5vw, 1rem);
}

/* Total Time */
.total-time {
    margin-top: 2rem;
    text-align: center;
    padding: clamp(1.5rem, 4vw, 2rem);
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
}

.total-time h3 {
    color: white;
    font-size: clamp(1.2rem, 4vw, 1.5rem);
    margin-bottom: 1rem;
}

.total-time-value {
    font-size: clamp(2rem, 6vw, 2.5rem);
    font-weight: bold;
    color: white;
    font-family: 'Courier New', monospace;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

/* Controls Section */
.controls-section {
    text-align: center;
}

/* Footer */
footer {
    text-align: center;
    padding: 2rem;
    color: var(--text-secondary);
    font-size: clamp(0.8rem, 2vw, 0.9rem);
}

/* ========================================
   FULLSCREEN MODE
   ======================================== */
.fullscreen-mode {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    height: 100dvh; /* For mobile browsers */
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    z-index: 9999;
    overflow-y: auto;
}

.fullscreen-header {
    position: absolute;
    top: 1rem;
    right: 1rem;
    z-index: 10000;
}

.exit-fullscreen-btn {
    background-color: rgba(255, 255, 255, 0.2);
    border: 2px solid rgba(255, 255, 255, 0.5);
    border-radius: 50%;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s ease;
    color: white;
}

.exit-fullscreen-btn:hover {
    background-color: rgba(255, 255, 255, 0.3);
    transform: scale(1.1);
}

.fullscreen-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    min-height: 100dvh;
    padding: clamp(2rem, 5vw, 4rem) clamp(1rem, 3vw, 2rem);
    color: white;
}

.fullscreen-progress {
    width: 100%;
    max-width: 600px;
    margin-bottom: clamp(2rem, 5vw, 3rem);
    text-align: center;
}

.fullscreen-progress h2 {
    font-size: clamp(1.5rem, 4vw, 2rem);
    margin-bottom: 1.5rem;
    color: white;
    border: none;
    padding: 0;
}

.progress-bar-fullscreen {
    width: 100%;
    height: 32px;
    background-color: rgba(255, 255, 255, 0.2);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.2);
}

.fullscreen-timer {
    text-align: center;
    margin-bottom: clamp(2rem, 5vw, 3rem);
}

.fullscreen-timer-label {
    font-size: clamp(1.2rem, 3vw, 1.5rem);
    margin-bottom: 0.5rem;
    opacity: 0.9;
}

.fullscreen-timer-value {
    font-size: clamp(4rem, 12vw, 6rem);
    font-weight: bold;
    font-family: 'Courier New', monospace;
    text-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
    line-height: 1;
}

.fullscreen-word {
    text-align: center;
    margin-bottom: clamp(2rem, 5vw, 3rem);
}

.word-number-text {
    font-size: clamp(1rem, 2.5vw, 1.2rem);
    opacity: 0.8;
    margin-bottom: 0.5rem;
}

.word-number-large {
    font-size: clamp(3rem, 10vw, 5rem);
    font-weight: bold;
    text-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
    line-height: 1;
}

.fullscreen-controls {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    width: 100%;
    max-width: 400px;
    align-items: center;
    margin: 0 auto;
}

.fullscreen-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    padding: clamp(1.25rem, 3vw, 1.5rem) clamp(2rem, 5vw, 3rem);
    font-size: clamp(1.2rem, 3vw, 1.5rem);
    font-weight: 600;
    border: none;
    border-radius: 16px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.2);
}

.fullscreen-btn:hover:not(:disabled) {
    transform: translateY(-4px);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.3);
}

.fullscreen-btn:active:not(:disabled) {
    transform: translateY(-2px);
}

.fullscreen-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.fullscreen-btn-play {
    background-color: #10b981;
    color: white;
}

.fullscreen-btn-play:hover:not(:disabled) {
    background-color: #059669;
}

.fullscreen-btn-play.playing {
    background-color: #f59e0b;
}

.fullscreen-btn-play.playing:hover:not(:disabled) {
    background-color: #d97706;
}

.fullscreen-btn-secondary {
    background-color: rgba(255, 255, 255, 0.25);
    color: white;
    backdrop-filter: blur(10px);
}

.fullscreen-btn-secondary:hover:not(:disabled) {
    background-color: rgba(255, 255, 255, 0.35);
}

.fullscreen-response-buttons {
    display: flex;
    gap: 1.5rem;
    width: 100%;
    max-width: 500px;
    justify-content: center;
    margin: 0 auto;
}

.fullscreen-btn-correct {
    background-color: #10b981;
    color: white;
    flex: 1;
}

.fullscreen-btn-correct:hover:not(:disabled) {
    background-color: #059669;
}

.fullscreen-btn-incorrect {
    background-color: #ef4444;
    color: white;
    flex: 1;
}

.fullscreen-btn-incorrect:hover:not(:disabled) {
    background-color: #dc2626;
}

/* Responsive Adjustments */
@media (max-width: 768px) {
    .container {
        padding: 0.5rem;
    }

    section {
        padding: 1rem;
        margin-bottom: 1rem;
    }

    .selection-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .results-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .btn-copy {
        width: 100%;
    }

    .controls-section .btn {
        width: 100%;
    }

    .fullscreen-controls {
        max-width: 100%;
        padding: 0 1rem;
    }

    .exit-fullscreen-btn {
        width: 40px;
        height: 40px;
    }
}

@media (max-width: 480px) {
    header h1 {
        font-size: 1.5rem;
    }

    .subtitle {
        font-size: 0.9rem;
    }

    .fullscreen-timer-value {
        font-size: 3.5rem;
    }

    .word-number-large {
        font-size: 3rem;
    }

    .fullscreen-btn {
        padding: 1rem 1.5rem;
        font-size: 1.1rem;
    }
}

@media (min-width: 1200px) {
    .fullscreen-controls {
        flex-direction: row;
        max-width: 700px;
    }

    .fullscreen-btn {
        flex: 1;
    }
}

/* Animations */
@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.8;
    }
}

.playing-indicator {
    animation: pulse 1.5s ease-in-out infinite;
}