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

body {
    font-family: 'Arial', 'Helvetica', sans-serif;
    background: #000000;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
    color: #000;
}

.container {
    background: #FFFFFF;
    border: 8px solid #000000;
    border-radius: 0;
    box-shadow: 12px 12px 0px 0px #000000;
    padding: 40px;
    max-width: 600px;
    width: 100%;
    position: relative;
}

.site-nav {
    margin-bottom: 30px;
    border-bottom: 4px solid #000000;
    padding-bottom: 15px;
}

.site-nav ul {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 10px 20px;
    justify-content: center;
}

.site-nav a {
    color: #000000;
    text-decoration: none;
    font-weight: 900;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-size: 0.95em;
}

.site-nav a:hover {
    text-decoration: underline;
}

.intro-text {
    font-size: 1.05em;
    line-height: 1.7;
    color: #000000;
    margin-bottom: 30px;
    padding: 15px 20px;
    background: #f5f5f5;
    border: 3px solid #000000;
}

.intro-text a {
    color: #E53935;
    font-weight: 900;
    text-decoration: none;
}

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

header {
    text-align: center;
    margin-bottom: 40px;
    border-bottom: 4px solid #000000;
    padding-bottom: 20px;
}

header h1 {
    font-size: 3em;
    color: #000000;
    margin-bottom: 10px;
    font-weight: 900;
    letter-spacing: -2px;
    text-transform: uppercase;
}

.subtitle {
    color: #000000;
    font-size: 1.1em;
    font-weight: bold;
    text-transform: uppercase;
    letter-spacing: 2px;
}

.tuner-container {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.frequency-display {
    text-align: center;
    padding: 30px 20px;
    background: #FFEB3B;
    border: 4px solid #000000;
    border-radius: 0;
    position: relative;
}

.frequency-value {
    font-size: 3.5em;
    font-weight: 900;
    color: #000000;
    margin-bottom: 10px;
    letter-spacing: -1px;
}

.note-display {
    font-size: 2.5em;
    font-weight: 900;
    color: #000000;
    text-transform: uppercase;
    letter-spacing: 4px;
}

.tuning-meter {
    position: relative;
    height: 120px;
    background: #FFFFFF;
    border: 4px solid #000000;
    border-radius: 0;
    margin: 20px 0;
    overflow: visible;
}

.meter-needle {
    position: absolute;
    top: 0;
    left: 50%;
    width: 6px;
    height: 100%;
    background: #E53935;
    transform-origin: bottom center;
    transform: translateX(-50%) rotate(0deg);
    transition: transform 0.25s cubic-bezier(0.25, 0.1, 0.25, 1),
                background 0.2s ease;
    z-index: 2;
    border-left: 2px solid #000000;
    border-right: 2px solid #000000;
}

.meter-needle::before {
    content: '';
    position: absolute;
    top: -15px;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 0;
    border-left: 10px solid transparent;
    border-right: 10px solid transparent;
    border-top: 20px solid #E53935;
    transition: border-top-color 0.2s ease;
}

.meter-needle[data-color="#4CAF50"]::before {
    border-top-color: #4CAF50;
}

.meter-needle[data-color="#FF9800"]::before {
    border-top-color: #FF9800;
}

.meter-needle[data-color="#2196F3"]::before {
    border-top-color: #2196F3;
}

.meter-scale {
    position: absolute;
    bottom: 10px;
    left: 0;
    right: 0;
    display: flex;
    justify-content: space-between;
    padding: 0 20px;
}

.scale-mark {
    font-size: 0.9em;
    color: #000000;
    font-weight: 900;
    text-transform: uppercase;
}

.center-mark {
    color: #000000;
    font-weight: 900;
    font-size: 1.2em;
    background: #FFEB3B;
    padding: 4px 8px;
    border: 2px solid #000000;
}

.string-selector {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 10px;
}

.string-button {
    background: #2196F3;
    color: #FFFFFF;
    padding: 15px 10px;
    border: 4px solid #000000;
    border-radius: 0;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    font-weight: 900;
    text-transform: uppercase;
}

.string-button:hover {
    background: #1976D2;
    transform: translate(-2px, -2px);
    box-shadow: 4px 4px 0px 0px #000000;
}

.string-button.active {
    background: #E53935;
    transform: translate(-2px, -2px);
    box-shadow: 4px 4px 0px 0px #000000;
}

.string-name {
    font-size: 1.5em;
    font-weight: bold;
}

.string-octave {
    font-size: 0.9em;
    opacity: 0.9;
}

.detected-string {
    text-align: center;
    padding: 20px;
    background: #FFFFFF;
    border: 4px solid #000000;
    border-radius: 0;
    font-size: 1.3em;
    font-weight: 900;
    text-transform: uppercase;
    letter-spacing: 2px;
}

#detectedStringName {
    color: #000000;
    margin-right: 10px;
}

.tuning-status {
    font-size: 0.9em;
    padding: 8px 16px;
    border: 3px solid #000000;
    border-radius: 0;
    display: inline-block;
    font-weight: 900;
    text-transform: uppercase;
    letter-spacing: 1px;
    transition: background 0.2s ease, color 0.2s ease;
}

.tuning-status.in-tune {
    background: #4CAF50;
    color: #FFFFFF;
    border-color: #000000;
}

.tuning-status.sharp {
    background: #FF9800;
    color: #000000;
    border-color: #000000;
}

.tuning-status.flat {
    background: #2196F3;
    color: #FFFFFF;
    border-color: #000000;
}

.controls {
    display: flex;
    gap: 15px;
    justify-content: center;
}

.btn {
    padding: 15px 30px;
    border: 4px solid #000000;
    border-radius: 0;
    font-size: 1.1em;
    font-weight: 900;
    cursor: pointer;
    transition: all 0.2s ease;
    flex: 1;
    max-width: 200px;
    text-transform: uppercase;
    letter-spacing: 2px;
}

.btn-primary {
    background: #E53935;
    color: #FFFFFF;
}

.btn-primary:hover:not(:disabled) {
    background: #C62828;
    transform: translate(-2px, -2px);
    box-shadow: 4px 4px 0px 0px #000000;
}

.btn-secondary {
    background: #000000;
    color: #FFFFFF;
}

.btn-secondary:hover:not(:disabled) {
    background: #424242;
    transform: translate(-2px, -2px);
    box-shadow: 4px 4px 0px 0px #000000;
}

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

.info {
    text-align: center;
    color: #000000;
    font-size: 0.9em;
    padding: 10px;
    font-weight: bold;
    text-transform: uppercase;
    letter-spacing: 1px;
    border-top: 2px solid #000000;
    padding-top: 20px;
}

.ad-container {
    margin: 20px 0;
    padding: 15px;
    background: #FFFFFF;
    border: 4px solid #000000;
    border-radius: 0;
    text-align: center;
    min-height: 100px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.ad-bottom {
    margin-top: 30px;
    margin-bottom: 0;
}

.adsbygoogle {
    display: block;
    width: 100%;
}

.content-section {
    margin-top: 50px;
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.content-block {
    background: #FFFFFF;
    border: 4px solid #000000;
    border-radius: 0;
    padding: 30px;
    box-shadow: 6px 6px 0px 0px #000000;
}

.content-block h2 {
    font-size: 2em;
    color: #000000;
    margin-bottom: 20px;
    font-weight: 900;
    text-transform: uppercase;
    letter-spacing: -1px;
    border-bottom: 3px solid #000000;
    padding-bottom: 15px;
}

.content-block h3 {
    font-size: 1.4em;
    color: #000000;
    margin-top: 25px;
    margin-bottom: 12px;
    font-weight: 900;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.content-block p {
    font-size: 1.1em;
    line-height: 1.8;
    color: #000000;
    margin-bottom: 15px;
    font-weight: 400;
}

.content-block a {
    color: #E53935;
    font-weight: 900;
    text-decoration: none;
}

.content-block a:hover {
    text-decoration: underline;
}

.content-block ul.tuning-list {
    list-style: none;
    padding-left: 0;
    margin: 20px 0;
}

.content-block ul.tuning-list li {
    font-size: 1.05em;
    line-height: 1.8;
    color: #000000;
    margin-bottom: 12px;
    padding-left: 25px;
    position: relative;
    font-weight: 400;
}

.content-block ul.tuning-list li::before {
    content: '•';
    position: absolute;
    left: 0;
    font-size: 1.5em;
    color: #E53935;
    font-weight: 900;
    line-height: 1.2;
}

.content-block ul.tuning-list li strong {
    color: #000000;
    font-weight: 900;
    text-transform: uppercase;
}

.site-footer {
    margin-top: 50px;
    padding-top: 25px;
    border-top: 4px solid #000000;
    text-align: center;
    font-size: 0.95em;
}

.site-footer p {
    margin-bottom: 10px;
}

.site-footer a {
    color: #000000;
    font-weight: 900;
    text-decoration: none;
}

.site-footer a:hover {
    text-decoration: underline;
}

.footer-copy {
    color: #424242;
    font-size: 0.9em;
    font-weight: 400;
}

.page-title {
    font-size: 2.5em;
    color: #000000;
    margin-bottom: 15px;
    font-weight: 900;
    text-transform: uppercase;
    letter-spacing: -1px;
}

.page-subtitle {
    font-size: 1.1em;
    color: #000000;
    margin-bottom: 30px;
    font-weight: 400;
    line-height: 1.6;
}

@media (max-width: 600px) {
    .container {
        padding: 20px;
    }

    header h1 {
        font-size: 2em;
    }

    .frequency-value {
        font-size: 2em;
    }

    .note-display {
        font-size: 1.5em;
    }

    .string-selector {
        grid-template-columns: repeat(3, 1fr);
    }

    .content-block {
        padding: 20px;
    }

    .content-block h2 {
        font-size: 1.5em;
    }

    .content-block h3 {
        font-size: 1.2em;
    }

    .content-block p {
        font-size: 1em;
    }

    .content-block ul.tuning-list li {
        font-size: 0.95em;
    }

    .site-nav ul {
        gap: 8px 12px;
    }

    .site-nav a {
        font-size: 0.85em;
    }

    .page-title {
        font-size: 1.8em;
    }
}