:root {
    --niya-obsidian: #0b0e11;
    --niya-slate: #1a1f26;
    --niya-cyan: #4deeea;
    --niya-mist: #c8d6e5;
    --font-main: 'Manrope', sans-serif;
    --glass-bg: rgba(26, 31, 38, 0.7);
    --glass-border: rgba(255, 255, 255, 0.05);
}

body {
    background-color: var(--niya-obsidian);
    color: var(--niya-mist);
    font-family: var(--font-main);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    line-height: 1.6;
}

/* Main Container */
#app {
    width: 100%;
    max-width: 900px;
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
}

/* PERSISTENT BRANDING */
.brand-header {
    width: 100%;
    text-align: center;
    margin-bottom: 40px;
    padding-bottom: 20px;
}

.brand-header .logo {
    margin: 0;
    font-size: 32px;
    font-weight: 800;
    letter-spacing: -1px;
    color: #fff;
    text-transform: uppercase;
}

.brand-header .logo span {
    color: var(--niya-cyan);
}

.brand-header .subline {
    font-size: 13px;
    color: #666;
    font-weight: 400;
    text-transform: uppercase;
    letter-spacing: 3px;
    margin-top: 5px;
    display: block;
}

.screen { display: none !important; text-align: center; width: 100%; animation: fadeIn 0.5s; }
.screen.active { display: block !important; }

/* -- CARDS (Engineer Selection) -- */
.cards { display: flex; gap: 20px; justify-content: center; flex-wrap: wrap; margin-top: 30px; }
.card { 
    background: var(--niya-slate); 
    padding: 24px; 
    border: 1px solid var(--glass-border); 
    cursor: pointer; 
    border-radius: 16px; 
    width: 200px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex; 
    flex-direction: column; 
    align-items: center;
    backdrop-filter: blur(10px);
}
.card:hover { 
    border-color: var(--niya-cyan); 
    transform: translateY(-5px); 
    background: rgba(77, 238, 234, 0.05);
    box-shadow: 0 10px 30px rgba(77, 238, 234, 0.15); 
}
.card h3 { 
    color: #fff; 
    margin: 15px 0 5px 0; 
    font-size: 18px; 
    font-weight: 700;
}
.card .persona { 
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--niya-cyan); 
    font-size: 11px; 
    font-weight: 800;
    margin-bottom: 12px; 
}
.card p { font-size: 12px; color: #888; line-height: 1.5; }

/* -- INPUTS & DROPDOWNS -- */
select, input:not([type=range]) {
    padding: 12px 16px; font-size: 14px; margin: 10px;
    background: var(--niya-slate); color: white; border: 1px solid var(--glass-border);
    border-radius: 8px;
    font-family: var(--font-main);
    transition: border-color 0.2s;
}
select:focus, input:not([type=range]):focus {
    border-color: var(--niya-cyan);
    outline: none;
}

button {
    background: var(--niya-cyan); 
    border: none; 
    padding: 14px 32px;
    font-size: 13px; 
    cursor: pointer; 
    font-weight: 800; 
    margin: 10px;
    border-radius: 8px; 
    text-transform: uppercase; 
    letter-spacing: 2px;
    color: var(--niya-obsidian); 
    transition: all 0.3s ease;
}
button:hover { 
    background: #fff; 
    box-shadow: 0 0 20px rgba(77, 238, 234, 0.4);
    transform: translateY(-1px);
}

/* -- UPLOAD AREA -- */
#drop-zone {
    border: 2px dashed #4deeea; padding: 40px; margin-bottom: 20px; 
    cursor: pointer; background: rgba(77, 238, 234, 0.05);
    border-radius: 8px;
}

/* -- WARNINGS & HELPERS -- */
.warning-box {
    background: rgba(255, 204, 0, 0.1);
    border-left: 3px solid #ffcc00;
    padding: 10px;
    margin: 15px auto;
    width: 80%;
    text-align: left;
    font-size: 13px;
    color: #eee;
}
.warning-box strong { color: #ffcc00; }

.daw-helper {
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px solid #333;
}
.daw-helper label { font-size: 12px; color: #aaa; display: block; margin-bottom: 5px; }
.daw-row { display: flex; justify-content: center; align-items: center; gap: 10px; }
.daw-row select { margin: 0; padding: 8px; }
.daw-row button { margin: 0; padding: 8px 15px; font-size: 12px; background: #333; color: #fff; }
.daw-row button:hover { background: #555; }

/* -- TRACK LIST -- */
.track-list-header {
    display: grid; grid-template-columns: 2fr 2fr 1fr;
    padding: 10px; border-bottom: 1px solid #444; font-weight: bold; color: #4deeea; text-align: left;
}
.track-row {
    display: grid; grid-template-columns: 2fr 2fr 1fr;
    padding: 10px; border-bottom: 1px solid #222; background: #15181c; align-items: center; text-align: left;
}
.track-row span { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; padding-right: 10px; }
.track-row select { margin: 0; padding: 5px; width: 100%; border: 1px solid #333; }
.status-ready { color: #4deeea; }
.status-uploading { color: yellow; }

/* ========================================= */
/*  MIXER LAYOUT (UNTOUCHED STRUCTURE)       */
/* ========================================= */

.mixer-container {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin: 30px 0;
    height: 350px; 
}

.fader-group {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-end; 
    width: 60px;
    position: relative;
    background: #15181c;
    border-radius: 5px;
    border: 1px solid #333;
    padding: 10px 5px;
}

.slider-wrapper {
    height: 200px;
    width: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 10px;
}

input[type=range].vertical-fader {
    writing-mode: bt-lr; 
    -webkit-appearance: none;
    width: 180px; 
    height: 6px;
    background: #333;
    border-radius: 3px;
    outline: none;
    transform: rotate(270deg);
    cursor: pointer;
}

input[type=range].vertical-fader::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 24px;
    height: 12px;
    border-radius: 2px;
    background: #eee; 
    cursor: pointer;
    border: 1px solid #999; 
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.5), inset 0 1px 0 rgba(255,255,255,0.8);
}

input[type=range].vertical-fader:active::-webkit-slider-thumb {
    background: var(--niya-cyan);
    border-color: #fff;
}

.gain-display {
    font-size: 11px;
    background: #111;
    border: 1px solid #444;
    padding: 2px 5px;
    width: 100%;
    text-align: center;
    margin-bottom: 5px;
    color: #fff;
    font-family: monospace;
}

.btn-group {
    display: flex;
    gap: 2px;
    width: 100%;
    margin-bottom: 5px;
}

.btn-m, .btn-s {
    flex: 1;
    height: 24px;
    font-size: 10px;
    font-weight: bold;
    border: 1px solid #555;
    background: #444;
    color: #ccc;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    border-radius: 3px;
    transition: all 0.1s;
}

.btn-m.active {
    background-color: #d63031 !important;
    color: white !important;
    border-color: #ff7675 !important;
    box-shadow: 0 0 5px rgba(214, 48, 49, 0.8);
}

.btn-s.active {
    background-color: #f1c40f !important;
    color: black !important;
    border-color: #f39c12 !important;
    box-shadow: 0 0 5px rgba(241, 196, 15, 0.8);
}

.fader-group label {
    font-size: 11px;
    font-weight: bold;
    color: #fff;
    text-transform: uppercase;
    margin-top: 5px;
}

/* TRANSPORT */
.transport {
    display: flex; align-items: center; gap: 20px; width: 100%; margin: 0 auto 30px auto;
    background: var(--niya-slate); padding: 20px; border-radius: 12px; border: 1px solid var(--glass-border);
    backdrop-filter: blur(10px);
}
#scrubber {
    flex-grow: 1; cursor: pointer; height: 4px; -webkit-appearance: none;
    background: #333; border-radius: 2px;
    accent-color: var(--niya-cyan);
}
#scrubber::-webkit-slider-thumb {
    -webkit-appearance: none; height: 16px; width: 16px; border-radius: 50%; background: var(--niya-cyan); cursor: pointer;
    box-shadow: 0 0 10px var(--niya-cyan);
}

.loader {
    border: 4px solid rgba(77, 238, 234, 0.1); border-top: 4px solid var(--niya-cyan); border-radius: 50%;
    width: 80px; height: 80px; animation: spin 1s cubic-bezier(0.4, 0, 0.2, 1) infinite; margin: 0 auto;
}

.loader-wrapper {
    position: relative;
    width: 80px;
    height: 80px;
    margin: 30px auto;
}

.loader-pct {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 12px;
    font-weight: 800;
    color: var(--niya-cyan);
    font-family: var(--font-main);
    letter-spacing: 0;
    pointer-events: none;
}


@keyframes spin { 0% { transform: rotate(0deg); } 100% { transform: rotate(360deg); } }
@keyframes fadeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }


/* Niya Signature Breathe Effect */
#app::before {
    content: "";
    position: fixed;
    top: 50%;
    left: 50%;
    width: 100vw;
    height: 100vh;
    background: radial-gradient(circle at center, var(--niya-cyan) 0%, transparent 70%);
    opacity: 0.03;
    z-index: -1;
    transform: translate(-50%, -50%);
    animation: breathe 8s ease-in-out infinite;
    pointer-events: none;
}

@keyframes breathe {
    0%, 100% { opacity: 0.02; transform: translate(-50%, -50%) scale(1); }
    50% { opacity: 0.05; transform: translate(-50%, -50%) scale(1.1); }
}

/* ========================================= */
/*  NEW FUSION 3-SCREEN FLOW STYLES         */
/* ========================================= */

.fusion-section {
    margin-bottom: 25px;
    padding-bottom: 20px;
    border-bottom: 1px solid rgba(255,255,255,0.05);
}

/* Engineer Grid */
.engineer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 12px;
    margin-top: 10px;
}

.engineer-card {
    background: var(--niya-slate);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    padding: 16px;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    text-align: center;
    position: relative;
}

.engineer-card:hover {
    border-color: var(--niya-cyan);
    transform: translateY(-3px);
    background: rgba(77, 238, 234, 0.05);
    box-shadow: 0 8px 25px rgba(77, 238, 234, 0.1);
}

.engineer-card.selected {
    border-color: var(--niya-cyan);
    background: rgba(77, 238, 234, 0.1);
    box-shadow: 0 0 0 2px var(--niya-cyan);
}

.engineer-card .eng-icon {
    font-size: 28px;
    margin-bottom: 8px;
}

.engineer-card .eng-name {
    color: #fff;
    font-weight: 700;
    font-size: 14px;
    margin-bottom: 3px;
}

.engineer-card .eng-persona {
    color: var(--niya-cyan);
    font-size: 10px;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 800;
    margin-bottom: 6px;
}

.engineer-card .eng-desc {
    color: #888;
    font-size: 11px;
    line-height: 1.4;
}

/* ALL Card Special Style */
.engineer-card-all {
    background: linear-gradient(135deg, var(--niya-slate) 0%, rgba(77, 238, 234, 0.15) 100%);
    border-color: var(--niya-cyan);
}

.engineer-card-all .all-badge {
    position: absolute;
    top: -6px;
    right: -6px;
    background: var(--niya-cyan);
    color: #000;
    font-size: 9px;
    font-weight: 800;
    padding: 2px 6px;
    border-radius: 8px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Stem Balance */
.balance-row {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 10px;
}

.balance-row label {
    width: 100px;
    font-size: 12px;
    color: #ccc;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 700;
    text-align: right;
}

.balance-row input[type=range] {
    flex: 1;
    margin: 0;
    height: 4px;
    -webkit-appearance: none;
    background: #333;
    border-radius: 2px;
    accent-color: var(--niya-cyan);
}

.balance-row input[type=range]::-webkit-slider-thumb {
    -webkit-appearance: none;
    height: 16px;
    width: 16px;
    border-radius: 50%;
    background: var(--niya-cyan);
    cursor: pointer;
}

.balance-row .bal-val {
    width: 45px;
    text-align: right;
    font-size: 12px;
    color: var(--niya-cyan);
    font-weight: 700;
    font-family: monospace;
}

/* Quota usage bars */
.quota-bar-container {
    margin-bottom: 8px;
}

.quota-bar-label {
    display: flex;
    justify-content: space-between;
    font-size: 11px;
    color: #aaa;
    margin-bottom: 3px;
}

.quota-bar-track {
    height: 6px;
    background: rgba(255,255,255,0.1);
    border-radius: 3px;
    overflow: hidden;
}

.quota-bar-fill {
    height: 100%;
    background: var(--niya-cyan);
    border-radius: 3px;
    transition: width 0.5s ease;
}

.quota-bar-fill.warning {
    background: #f39c12;
}

.quota-bar-fill.danger {
    background: #e74c3c;
}

/* Payment section */
.payment-included {
    color: #2ecc71;
    font-weight: 700;
}

.payment-price {
    font-size: 24px;
    font-weight: 800;
    color: #fff;
}

.payment-upsell {
    background: rgba(77, 238, 234, 0.05);
    border: 1px solid var(--niya-cyan);
    border-radius: 8px;
    padding: 10px;
    margin-top: 10px;
    font-size: 12px;
    color: #aaa;
    text-align: center;
}

/* File rows in fusion upload */
.fusion-file-row {
    display: grid;
    grid-template-columns: 24px 2fr 2fr 1fr auto;
    gap: 10px;
    align-items: center;
    padding: 8px 12px;
    background: rgba(0,0,0,0.3);
    border-radius: 6px;
    margin-bottom: 4px;
    font-size: 12px;
}

.fusion-file-row .ffilename {
    color: #fff;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.fusion-file-row select {
    margin: 0;
    padding: 4px 6px;
    font-size: 11px;
    border: 1px solid #333;
    width: 100%;
}

.fusion-file-row .fstatus {
    font-size: 11px;
    text-align: center;
}

.fusion-file-row .fstatus.ready {
    color: #4deeea;
}

.fusion-file-row .fstatus.uploading {
    color: #f1c40f;
}

.fusion-file-row .fstatus.error {
    color: #e74c3c;
}

/* Mobile responsive */
@media (max-width: 768px) {
    .engineer-grid {
        grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
        gap: 8px;
    }
    
    .engineer-card {
        padding: 12px;
    }
    
    .engineer-card .eng-icon {
        font-size: 22px;
    }
    
    .engineer-card .eng-name {
        font-size: 12px;
    }
    
    .fusion-file-row {
        grid-template-columns: 1fr 1fr;
        gap: 5px;
    }
    
    .balance-row {
        flex-wrap: wrap;
        gap: 8px;
    }
    
    .balance-row label {
        width: 70px;
        font-size: 11px;
    }
}
#welcome-message { text-align: center; width: 100%; margin-top: 0; }

/* Strong screen isolation - force all screens hidden by default */
section.screen { display: none !important; }
section.screen.active { display: block !important; }

.pitch-correction-section {
    margin-top: 8px;
    padding: 6px 10px;
    background: rgba(0,255,255,0.03);
    border-radius: 4px;
    display: none;
    font-size: 11px;
}
.pitch-correction-section.visible {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 6px;
}
.pitch-correction-section label {
    color: #888;
}
.pitch-correction-section select {
    background: #111;
    color: #ddd;
    border: 1px solid #333;
    padding: 3px 6px;
    font-size: 10px;
    border-radius: 3px;
    cursor: pointer;
}


/* Kits */
.kits-container { max-width: 700px; margin: 0 auto; padding: 20px; }
.kits-subtitle { color: #888; font-size: 13px; margin-bottom: 20px; }
.kits-tabs { display: flex; gap: 0; margin-bottom: 20px; }
.kits-tab { padding: 10px 24px; background: #1a1a1a; border: 1px solid #333; color: #888; cursor: pointer; font-size: 13px; border-radius: 4px 4px 0 0; }
.kits-tab.active { background: #222; color: var(--niya-cyan); border-bottom-color: #222; }
.kits-panel { background: #222; border: 1px solid #333; border-radius: 0 4px 4px 4px; padding: 20px; }
.kits-form { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }
.kits-form select { background: #111; color: #ddd; border: 1px solid #333; padding: 8px 12px; font-size: 12px; border-radius: 4px; }
.kits-descriptors { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; }
.kits-desc-label { color: #888; font-size: 11px; margin-right: 4px; }
.kits-desc-tag { font-size: 10px; color: #bbb; cursor: pointer; padding: 3px 8px; border: 1px solid #333; border-radius: 12px; display: flex; align-items: center; gap: 3px; }
.kits-desc-tag input { cursor: pointer; accent-color: var(--niya-cyan); }
.kits-desc-tag:has(input:checked) { background: rgba(0,255,255,0.1); border-color: var(--niya-cyan); color: var(--niya-cyan); }
#kits-btn-generate, #kits-btn-variate { background: var(--niya-cyan); color: #000; border: none; padding: 10px 24px; font-size: 13px; font-weight: bold; border-radius: 4px; cursor: pointer; white-space: nowrap; }
#kits-btn-generate:disabled, #kits-btn-variate:disabled { opacity: 0.5; cursor: not-allowed; }
.kits-upload-zone { border: 2px dashed #444; border-radius: 8px; padding: 30px; text-align: center; cursor: pointer; color: #888; font-size: 13px; margin-bottom: 10px; transition: border-color 0.2s; }
.kits-upload-zone:hover { border-color: var(--niya-cyan); color: #aaa; }
.kits-spinner { width: 30px; height: 30px; border: 3px solid #333; border-top: 3px solid var(--niya-cyan); border-radius: 50%; margin: 15px auto; animation: spin 0.8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
.kits-bank-tabs { display: flex; gap: 4px; margin-bottom: 15px; }
.kits-bank-tab { padding: 8px 16px; background: #1a1a1a; border: 1px solid #333; color: #888; cursor: pointer; font-size: 12px; border-radius: 4px 4px 0 0; }
.kits-bank-tab.active { background: #252525; color: var(--niya-cyan); border-bottom-color: #252525; }
.kits-pad-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; margin-bottom: 20px; }
.kits-pad { background: #1a1a1a; border: 1px solid #333; border-radius: 6px; padding: 14px 8px; text-align: center; cursor: pointer; transition: all 0.15s; user-select: none; }
.kits-pad:hover { background: #252525; border-color: #555; }
.kits-pad.playing { background: rgba(0,255,255,0.1); border-color: var(--niya-cyan); box-shadow: 0 0 8px rgba(0,255,255,0.15); }
.kits-pad-number { font-size: 20px; font-weight: bold; color: #ddd; }
.kits-pad-name { font-size: 9px; color: #777; margin-top: 4px; text-transform: uppercase; letter-spacing: 0.5px; }
.kits-export-btns { display: flex; gap: 10px; }
.kits-export-btns button { background: #2ecc71; color: #000; border: none; padding: 10px 20px; font-size: 12px; font-weight: bold; border-radius: 4px; cursor: pointer; }
.kits-export-btns button:last-child { background: #3498db; }
/* Engineer Card Images */
.eng-photo {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    object-fit: cover;
    margin-bottom: 10px;
    border: 2px solid var(--glass-border);
}
.engineer-card {
    padding: 20px 15px;
    min-width: 160px;
}
.eng-desc {
    font-size: 11px;
    color: #999;
    font-style: italic;
    margin-top: 6px;
    line-height: 1.4;
}