/* ==========================================================================
   MODERN METRONOME STUDIO - ADVANCED STYLING (PRO UI)
   ========================================================================== */

:root {
    --bg-dark: #0a0c10;
    --bg-card: rgba(18, 22, 31, 0.75);
    --bg-card-hover: rgba(26, 32, 44, 0.85);
    --bg-card-active: rgba(33, 41, 57, 0.95);
    --border-subtle: rgba(255, 255, 255, 0.08);
    --border-active: rgba(0, 242, 254, 0.5);

    /* Vurgu Renkleri */
    --accent-cyan: #00f2fe;
    --accent-cyan-glow: rgba(0, 242, 254, 0.35);
    --accent-neon-green: #00ff87;
    --accent-violet: #7928ca;
    --accent-magenta: #ff007a;
    --accent-orange: #ff9900;
    --accent-red: #ff3366;

    /* Metin Renkleri */
    --text-primary: #ffffff;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;

    /* Font Ailesi */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

    /* Geçişler */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-bounce: 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
}

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

body {
    font-family: var(--font-sans);
    background-color: var(--bg-dark);
    background-image: 
        radial-gradient(circle at 50% 0%, rgba(121, 40, 202, 0.15) 0%, transparent 60%),
        radial-gradient(circle at 10% 80%, rgba(0, 242, 254, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 90% 90%, rgba(255, 0, 122, 0.06) 0%, transparent 50%);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
}

/* Scrollbar Tasarımı */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}
::-webkit-scrollbar-track {
    background: var(--bg-dark);
}
::-webkit-scrollbar-thumb {
    background: var(--border-subtle);
    border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--accent-cyan);
}

/* ==========================================================================
   APP HEADER
   ========================================================================== */
.app-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 2rem;
    border-bottom: 1px solid var(--border-subtle);
    background: rgba(10, 12, 16, 0.8);
    backdrop-filter: blur(20px);
    position: sticky;
    top: 0;
    z-index: 100;
}

.logo-area {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo-badge {
    width: 38px;
    height: 38px;
    border-radius: 10px;
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-violet));
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 0 15px var(--accent-cyan-glow);
}

.logo-badge svg {
    width: 22px;
    height: 22px;
    color: #000;
    fill: currentColor;
}

.logo-text h1 {
    font-size: 1.15rem;
    font-weight: 800;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    background: linear-gradient(to right, #fff, #cbd5e1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.logo-text span {
    font-size: 0.7rem;
    color: var(--accent-cyan);
    font-family: var(--font-mono);
    letter-spacing: 2px;
    display: block;
    text-transform: uppercase;
}

/* Sekme Navigasyonu */
.nav-tabs {
    display: flex;
    gap: 0.5rem;
    background: rgba(255, 255, 255, 0.04);
    padding: 0.3rem;
    border-radius: 12px;
    border: 1px solid var(--border-subtle);
}

.tab-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-normal);
}

.tab-btn:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.06);
}

.tab-btn.active {
    color: #000;
    background: var(--accent-cyan);
    box-shadow: 0 0 12px var(--accent-cyan-glow);
}

.header-tools {
    display: flex;
    align-items: center;
    gap: 1rem;
}

/* Ses Seviyesi Kontrolü */
.volume-control {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(255, 255, 255, 0.04);
    padding: 0.4rem 0.8rem;
    border-radius: 10px;
    border: 1px solid var(--border-subtle);
}

.volume-control svg {
    width: 18px;
    height: 18px;
    color: var(--text-secondary);
}

.volume-slider {
    width: 70px;
    accent-color: var(--accent-cyan);
    cursor: pointer;
}

.icon-btn {
    width: 36px;
    height: 36px;
    border-radius: 9px;
    border: 1px solid var(--border-subtle);
    background: rgba(255, 255, 255, 0.04);
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition-normal);
}

.icon-btn:hover {
    color: var(--accent-cyan);
    border-color: var(--accent-cyan);
    background: rgba(0, 242, 254, 0.1);
}

/* ==========================================================================
   MAIN CONTAINER & PANELS
   ========================================================================== */
.main-container {
    flex: 1;
    max-width: 1100px;
    width: 100%;
    margin: 0 auto;
    padding: 1.5rem 1rem 3rem 1rem;
    display: flex;
    flex-direction: column;
}

.tab-content {
    display: none;
    animation: fadeIn 0.3s ease;
}

.tab-content.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(6px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Glassmorphic Panel Kartları */
.glass-card {
    background: var(--bg-card);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--border-subtle);
    border-radius: 20px;
    padding: 1.5rem;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
    position: relative;
    overflow: hidden;
}

.glass-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
}

/* ==========================================================================
   METRONOME CORE PANEL (ANA MOD)
   ========================================================================== */
.metronome-layout {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
}

/* Görselleştirici Alanı (Sarkaç & Dinamik Halka) */
.visualizer-wrapper {
    position: relative;
    width: 100%;
    min-height: 240px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    border-radius: 16px;
    background: radial-gradient(circle at center, rgba(15, 23, 42, 0.6) 0%, rgba(10, 12, 16, 0.8) 100%);
    border: 1px solid var(--border-subtle);
    padding: 1rem;
}

.visual-mode-toggle {
    position: absolute;
    top: 1rem;
    right: 1rem;
    display: flex;
    gap: 0.3rem;
    background: rgba(0, 0, 0, 0.4);
    padding: 0.25rem;
    border-radius: 8px;
    border: 1px solid var(--border-subtle);
    z-index: 10;
}

.visual-mode-btn {
    padding: 0.25rem 0.6rem;
    font-size: 0.75rem;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    border-radius: 5px;
    cursor: pointer;
    font-weight: 600;
}

.visual-mode-btn.active {
    background: rgba(255, 255, 255, 0.15);
    color: #fff;
}

/* Sarkaç (Canvas) */
#pendulumCanvas {
    width: 100%;
    max-width: 480px;
    height: 220px;
}

/* Dinamik Ritim Halkası Modu */
.pulse-ring-container {
    display: none;
    position: relative;
    width: 200px;
    height: 200px;
    align-items: center;
    justify-content: center;
}

.pulse-ring {
    position: absolute;
    width: 160px;
    height: 160px;
    border-radius: 50%;
    border: 2px solid var(--accent-cyan);
    opacity: 0.4;
    transition: transform 0.05s ease, opacity 0.05s ease;
}

.pulse-core {
    width: 90px;
    height: 90px;
    border-radius: 50%;
    background: radial-gradient(circle, var(--accent-cyan) 0%, rgba(0, 242, 254, 0.1) 70%);
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-mono);
    font-size: 1.5rem;
    font-weight: 800;
    color: #fff;
    box-shadow: 0 0 20px var(--accent-cyan-glow);
    transition: transform 0.05s ease, box-shadow 0.05s ease;
}

.pulse-ring.flash {
    transform: scale(1.35);
    opacity: 0.9;
    border-color: var(--accent-neon-green);
    box-shadow: 0 0 25px var(--accent-neon-green);
}

.pulse-core.flash {
    transform: scale(1.12);
    box-shadow: 0 0 35px var(--accent-neon-green);
}

.pulse-core.accent-flash {
    transform: scale(1.2);
    background: radial-gradient(circle, var(--accent-magenta) 0%, rgba(255, 0, 122, 0.2) 70%);
    box-shadow: 0 0 45px var(--accent-magenta);
}

/* ==========================================================================
   BPM DISPLAY & DIAL / CONTROLS
   ========================================================================== */
.bpm-display-group {
    text-align: center;
    margin: 1.5rem 0 1rem 0;
}

.bpm-number-wrapper {
    display: inline-flex;
    align-items: baseline;
    justify-content: center;
    gap: 0.5rem;
    position: relative;
    cursor: pointer;
}

.bpm-number {
    font-family: var(--font-mono);
    font-size: 5.5rem;
    font-weight: 900;
    line-height: 1;
    letter-spacing: -2px;
    color: #fff;
    text-shadow: 0 0 30px rgba(0, 242, 254, 0.3);
    user-select: none;
    transition: color var(--transition-fast);
}

.bpm-unit {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--accent-cyan);
    letter-spacing: 2px;
}

/* İtalyan Tempo Adı Etiketi */
.tempo-marking {
    display: inline-block;
    margin-top: 0.25rem;
    padding: 0.35rem 1.2rem;
    border-radius: 20px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-subtle);
    font-size: 0.9rem;
    font-weight: 700;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    color: var(--accent-cyan);
    cursor: pointer;
    transition: var(--transition-normal);
}

.tempo-marking:hover {
    background: rgba(0, 242, 254, 0.15);
    border-color: var(--accent-cyan);
}

/* BPM Slider Barı */
.bpm-slider-bar {
    width: 100%;
    max-width: 600px;
    margin: 1.5rem auto 1rem auto;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.bpm-range-slider {
    flex: 1;
    -webkit-appearance: none;
    height: 8px;
    border-radius: 4px;
    background: rgba(255, 255, 255, 0.1);
    outline: none;
    cursor: pointer;
}

.bpm-range-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--accent-cyan);
    cursor: pointer;
    box-shadow: 0 0 10px var(--accent-cyan-glow);
    border: 2px solid #fff;
    transition: transform var(--transition-fast);
}

.bpm-range-slider::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

/* Hassas Adım Butonları (+/- 1, +/- 5, TAP) */
.bpm-controls-row {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    margin: 1rem 0 1.5rem 0;
    flex-wrap: wrap;
}

.bpm-step-btn {
    padding: 0.5rem 1rem;
    border-radius: 10px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-subtle);
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 0.95rem;
    font-weight: 700;
    cursor: pointer;
    transition: var(--transition-fast);
}

.bpm-step-btn:hover {
    background: rgba(255, 255, 255, 0.12);
    border-color: var(--text-secondary);
    transform: translateY(-2px);
}

.tap-tempo-btn {
    padding: 0.65rem 1.6rem;
    border-radius: 12px;
    background: linear-gradient(135deg, rgba(121, 40, 202, 0.3), rgba(0, 242, 254, 0.3));
    border: 1px solid var(--border-active);
    color: #fff;
    font-size: 0.95rem;
    font-weight: 800;
    letter-spacing: 1px;
    cursor: pointer;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
    transition: var(--transition-fast);
    user-select: none;
}

.tap-tempo-btn:active {
    transform: scale(0.94);
    background: var(--accent-cyan);
    color: #000;
    box-shadow: 0 0 20px var(--accent-cyan-glow);
}

/* ==========================================================================
   ANA OYNAT / DURDUR BUTONU (BIG HERO BUTTON)
   ========================================================================== */
.play-btn-wrapper {
    display: flex;
    justify-content: center;
    margin: 1.5rem 0 2rem 0;
}

.main-play-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    width: 100%;
    max-width: 320px;
    height: 70px;
    border-radius: 35px;
    border: none;
    background: linear-gradient(135deg, #00f2fe 0%, #4facfe 100%);
    color: #050b14;
    font-size: 1.25rem;
    font-weight: 800;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    cursor: pointer;
    box-shadow: 0 8px 30px rgba(0, 242, 254, 0.4), inset 0 2px 2px rgba(255, 255, 255, 0.5);
    transition: var(--transition-normal);
}

.main-play-btn svg {
    width: 28px;
    height: 28px;
    fill: currentColor;
}

.main-play-btn:hover {
    transform: translateY(-3px) scale(1.02);
    box-shadow: 0 12px 40px rgba(0, 242, 254, 0.6);
}

.main-play-btn:active {
    transform: translateY(1px) scale(0.98);
}

.main-play-btn.playing {
    background: linear-gradient(135deg, #ff007a 0%, #7928ca 100%);
    color: #ffffff;
    box-shadow: 0 8px 30px rgba(255, 0, 122, 0.5);
}

.main-play-btn.playing:hover {
    box-shadow: 0 12px 40px rgba(255, 0, 122, 0.7);
}

/* ==========================================================================
   VURUŞ MATRİSİ (BEAT MATRIX) VE ALT BÖLÜMLER
   ========================================================================== */
.beat-matrix-section {
    margin-top: 1rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-subtle);
}

.section-label {
    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.section-label span.hint {
    font-size: 0.7rem;
    color: var(--text-muted);
    font-weight: normal;
    text-transform: none;
}

/* Vuruş Kutucukları Izgarası */
.beat-pads-grid {
    display: flex;
    gap: 0.75rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 1.5rem;
}

.beat-pad {
    flex: 1;
    min-width: 55px;
    max-width: 90px;
    height: 75px;
    background: rgba(255, 255, 255, 0.04);
    border: 2px solid var(--border-subtle);
    border-radius: 14px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition-fast);
    position: relative;
    user-select: none;
}

.beat-pad .pad-number {
    font-family: var(--font-mono);
    font-size: 1.25rem;
    font-weight: 800;
    color: var(--text-secondary);
}

.beat-pad .pad-state-label {
    font-size: 0.65rem;
    font-weight: 700;
    text-transform: uppercase;
    margin-top: 0.2rem;
    letter-spacing: 0.5px;
}

/* Pad Durumları */
.beat-pad.accent {
    border-color: var(--accent-magenta);
    background: rgba(255, 0, 122, 0.08);
}
.beat-pad.accent .pad-number,
.beat-pad.accent .pad-state-label {
    color: var(--accent-magenta);
}

.beat-pad.normal {
    border-color: var(--accent-cyan);
    background: rgba(0, 242, 254, 0.08);
}
.beat-pad.normal .pad-number,
.beat-pad.normal .pad-state-label {
    color: var(--accent-cyan);
}

.beat-pad.muted {
    border-color: rgba(255, 255, 255, 0.05);
    background: rgba(0, 0, 0, 0.25);
    opacity: 0.45;
}
.beat-pad.muted .pad-number,
.beat-pad.muted .pad-state-label {
    color: var(--text-muted);
}

/* Vuruş Anı Parlaması */
.beat-pad.active-flash {
    transform: scale(1.08);
    box-shadow: 0 0 25px currentColor;
    background: currentColor;
}
.beat-pad.active-flash .pad-number,
.beat-pad.active-flash .pad-state-label {
    color: #000 !important;
}

/* Ayar Seçiciler (Zaman İmzası ve Alt Bölümler) */
.settings-selector-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1rem;
    margin-top: 1rem;
}

.selector-box {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-subtle);
    border-radius: 12px;
    padding: 0.85rem;
}

.chips-row {
    display: flex;
    gap: 0.4rem;
    flex-wrap: wrap;
}

.chip-btn {
    padding: 0.4rem 0.75rem;
    border-radius: 8px;
    border: 1px solid var(--border-subtle);
    background: rgba(255, 255, 255, 0.04);
    color: var(--text-secondary);
    font-size: 0.8rem;
    font-weight: 700;
    cursor: pointer;
    transition: var(--transition-fast);
}

.chip-btn:hover {
    background: rgba(255, 255, 255, 0.08);
    color: #fff;
}

.chip-btn.active {
    background: rgba(0, 242, 254, 0.2);
    border-color: var(--accent-cyan);
    color: var(--accent-cyan);
    box-shadow: 0 0 10px rgba(0, 242, 254, 0.2);
}

/* Ses Kiti Seçim Çubuğu */
.sound-kit-select-row {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    margin-top: 0.5rem;
}

.sound-kit-btn {
    flex: 1;
    min-width: 90px;
    padding: 0.5rem;
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-subtle);
    color: var(--text-secondary);
    font-size: 0.75rem;
    font-weight: 600;
    cursor: pointer;
    text-align: center;
    transition: var(--transition-fast);
}

.sound-kit-btn:hover {
    background: rgba(255, 255, 255, 0.07);
    color: #fff;
}

.sound-kit-btn.active {
    background: rgba(121, 40, 202, 0.25);
    border-color: var(--accent-violet);
    color: #fff;
    box-shadow: 0 0 10px rgba(121, 40, 202, 0.3);
}

/* ==========================================================================
   HIZ EĞİTMENİ (TEMPO TRAINER) PANELİ
   ========================================================================== */
.trainer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.trainer-card {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-subtle);
    border-radius: 16px;
    padding: 1.25rem;
}

.card-title {
    font-size: 1.05rem;
    font-weight: 700;
    color: #fff;
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.switch {
    position: relative;
    display: inline-block;
    width: 44px;
    height: 24px;
}

.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider-toggle {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(255, 255, 255, 0.1);
    transition: .3s;
    border-radius: 24px;
    border: 1px solid var(--border-subtle);
}

.slider-toggle:before {
    position: absolute;
    content: "";
    height: 16px;
    width: 16px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    transition: .3s;
    border-radius: 50%;
}

input:checked + .slider-toggle {
    background-color: var(--accent-neon-green);
}

input:checked + .slider-toggle:before {
    transform: translateX(20px);
    background-color: #000;
}

.form-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin: 1rem 0;
}

.form-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.form-input-number {
    width: 80px;
    background: rgba(0, 0, 0, 0.4);
    border: 1px solid var(--border-subtle);
    border-radius: 8px;
    color: #fff;
    font-family: var(--font-mono);
    font-size: 1rem;
    padding: 0.4rem 0.6rem;
    text-align: center;
}

.trainer-status-banner {
    margin-top: 1rem;
    padding: 0.8rem 1rem;
    border-radius: 10px;
    background: rgba(0, 242, 254, 0.08);
    border: 1px solid var(--accent-cyan-glow);
    font-size: 0.85rem;
    color: var(--accent-cyan);
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

/* ==========================================================================
   POLİRİTİM STÜDYOSU (POLYRHYTHM) PANELİ
   ========================================================================== */
.polyrhythm-layout {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
}

#polyrhythmCanvas {
    width: 100%;
    max-width: 440px;
    height: 320px;
    background: radial-gradient(circle at center, rgba(15, 23, 42, 0.7) 0%, rgba(10, 12, 16, 0.9) 100%);
    border-radius: 20px;
    border: 1px solid var(--border-subtle);
}

.polyrhythm-controls {
    display: flex;
    gap: 2rem;
    width: 100%;
    max-width: 500px;
    justify-content: space-around;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-subtle);
    padding: 1.2rem;
    border-radius: 16px;
}

.poly-track-box {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

.poly-track-title {
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.poly-val-selector {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.poly-number-display {
    font-family: var(--font-mono);
    font-size: 2rem;
    font-weight: 800;
    min-width: 45px;
    text-align: center;
}

.poly-btn-step {
    width: 32px;
    height: 32px;
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid var(--border-subtle);
    color: #fff;
    cursor: pointer;
    font-weight: bold;
}

.poly-presets-row {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    justify-content: center;
}

/* ==========================================================================
   REFERANS AKORT TONU (PITCH GENERATOR) PANELİ
   ========================================================================== */
.tuner-card {
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
}

.pitch-frequency-display {
    font-family: var(--font-mono);
    font-size: 4rem;
    font-weight: 900;
    color: var(--accent-neon-green);
    text-shadow: 0 0 25px rgba(0, 255, 135, 0.4);
    margin: 1rem 0;
}

.pitch-notes-grid {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 0.5rem;
    margin: 1.5rem 0;
}

.pitch-note-btn {
    padding: 0.75rem 0.5rem;
    border-radius: 10px;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border-subtle);
    color: #fff;
    font-weight: 700;
    font-size: 1.1rem;
    cursor: pointer;
    transition: var(--transition-fast);
}

.pitch-note-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--accent-neon-green);
}

.pitch-note-btn.active {
    background: var(--accent-neon-green);
    color: #000;
    box-shadow: 0 0 15px rgba(0, 255, 135, 0.4);
}

.octave-selector-row {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    margin: 1rem 0;
}

/* ==========================================================================
   PRATİK ZAMANLAYICISI (PRACTICE TIMER BAR)
   ========================================================================== */
.practice-timer-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: rgba(18, 22, 31, 0.85);
    border: 1px solid var(--border-subtle);
    border-radius: 14px;
    padding: 0.75rem 1.5rem;
    margin-top: 1.5rem;
    backdrop-filter: blur(10px);
}

.timer-info {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.timer-clock {
    font-family: var(--font-mono);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--accent-cyan);
}

.timer-quick-presets {
    display: flex;
    gap: 0.4rem;
}

/* ==========================================================================
   MODAL (KISAYOLLAR VE REHBER)
   ========================================================================== */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.75);
    backdrop-filter: blur(8px);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 1rem;
}

.modal-overlay.active {
    display: flex;
}

.modal-card {
    background: #11151f;
    border: 1px solid var(--border-active);
    border-radius: 20px;
    max-width: 500px;
    width: 100%;
    padding: 1.75rem;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.8);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.25rem;
}

.modal-header h2 {
    font-size: 1.25rem;
    font-weight: 700;
}

.shortcuts-table {
    width: 100%;
    border-collapse: collapse;
}

.shortcuts-table td {
    padding: 0.6rem 0;
    border-bottom: 1px solid var(--border-subtle);
    font-size: 0.85rem;
}

.kbd {
    display: inline-block;
    padding: 0.2rem 0.5rem;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 5px;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--accent-cyan);
}

/* ==========================================================================
   DUYARLI MOBİL UYARLAMA (RESPONSIVE)
   ========================================================================== */
@media (max-width: 768px) {
    .app-header {
        padding: 0.75rem 1rem;
        flex-wrap: wrap;
        gap: 0.75rem;
    }

    .nav-tabs {
        order: 3;
        width: 100%;
        justify-content: space-around;
    }

    .tab-btn {
        padding: 0.5rem 0.5rem;
        font-size: 0.75rem;
    }

    .tab-btn svg {
        display: none;
    }

    .bpm-number {
        font-size: 4rem;
    }

    .beat-pad {
        min-width: 44px;
        height: 60px;
    }

    .beat-pad .pad-number {
        font-size: 1rem;
    }

    .main-play-btn {
        height: 60px;
        font-size: 1.1rem;
    }

    .practice-timer-bar {
        flex-direction: column;
        gap: 0.75rem;
        text-align: center;
    }
}