.startrail-page {
    min-height: 100vh;
    padding: 140px 5% 80px;
    position: relative;
    z-index: 2;
}

.tool-shell {
    max-width: 1440px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 360px 1fr;
    gap: 24px;
}

.control-panel,
.preview-panel {
    background: rgba(20, 20, 20, 0.65);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 6px;
    padding: 26px;
}

.panel-head h1 {
    margin-top: 12px;
    font-family: 'Space Grotesk', sans-serif;
    font-weight: 500;
    font-size: 30px;
    letter-spacing: -0.5px;
}

.panel-head p {
    color: var(--text-secondary);
    margin-top: 10px;
    font-size: 13px;
    line-height: 1.6;
}

.control-row {
    display: grid;
    gap: 10px;
    margin-top: 20px;
    color: var(--text-primary);
    font-family: 'Inter', sans-serif;
    font-size: 13px;
}

.control-row input[type="file"],
.control-row select,
.control-row input[type="range"] {
    width: 100%;
}

.control-row input[type="file"],
.control-row select {
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid rgba(255, 255, 255, 0.16);
    color: var(--text-primary);
    padding: 10px 12px;
    border-radius: 4px;
}

.control-row select {
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
    background-image:
        linear-gradient(45deg, transparent 50%, rgba(255, 255, 255, 0.9) 50%),
        linear-gradient(135deg, rgba(255, 255, 255, 0.9) 50%, transparent 50%);
    background-position:
        calc(100% - 16px) calc(50% + 1px),
        calc(100% - 10px) calc(50% + 1px);
    background-size: 6px 6px, 6px 6px;
    background-repeat: no-repeat;
    padding-right: 34px;
    color-scheme: dark;
}

.control-row select:focus {
    outline: none;
    border-color: var(--accent-tech);
    box-shadow: 0 0 0 1px rgba(0, 242, 255, 0.35);
}

.control-row select option {
    background: #15181d;
    color: #f3fbff;
}

.control-row small {
    color: var(--text-secondary);
    line-height: 1.4;
}

.control-inline {
    display: grid;
    grid-template-columns: 48px 1fr;
    gap: 8px;
    align-items: center;
}

.control-inline label {
    color: var(--text-secondary);
    font-size: 12px;
}

.control-inline input[type="number"] {
    width: 100%;
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid rgba(255, 255, 255, 0.16);
    color: var(--text-primary);
    padding: 8px 10px;
    border-radius: 4px;
}

.control-inline input[type="number"]:focus {
    outline: none;
    border-color: var(--accent-tech);
    box-shadow: 0 0 0 1px rgba(0, 242, 255, 0.35);
}

#generateBtn,
#downloadLink {
    margin-top: 22px;
    width: 100%;
    text-align: center;
    cursor: pointer;
}

#generateBtn:disabled {
    opacity: 0.55;
    cursor: not-allowed;
}

.status-text {
    margin-top: 14px;
    color: var(--text-secondary);
    font-size: 12px;
    font-family: 'Space Grotesk', monospace;
    letter-spacing: 0.4px;
    min-height: 36px;
}

.hidden {
    display: none;
}

.preview-head h2 {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 24px;
    font-weight: 500;
}

.preview-head p {
    margin-top: 6px;
    color: var(--text-secondary);
    font-size: 13px;
}

.canvas-wrap {
    position: relative;
    margin-top: 18px;
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 4px;
    overflow: hidden;
    background: rgba(0, 0, 0, 0.4);
}

.canvas-wrap.drag-active {
    border-color: var(--accent-tech);
    box-shadow: 0 0 0 1px rgba(0, 242, 255, 0.45), inset 0 0 32px rgba(0, 242, 255, 0.08);
}

#previewCanvas {
    display: block;
    width: 100%;
    height: auto;
    max-height: 75vh;
    background: #000;
}

.empty-hint {
    position: absolute;
    inset: 0;
    display: grid;
    place-items: center;
    color: rgba(255, 255, 255, 0.58);
    font-family: 'Space Grotesk', sans-serif;
    letter-spacing: 1px;
    pointer-events: none;
}

.drop-hint {
    position: absolute;
    inset: 0;
    display: grid;
    place-items: center;
    background: rgba(0, 0, 0, 0.62);
    color: #ddfbff;
    font-family: 'Space Grotesk', sans-serif;
    font-size: 16px;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    pointer-events: none;
}

@media (max-width: 1024px) {
    .tool-shell {
        grid-template-columns: 1fr;
    }

    .startrail-page {
        padding-top: 110px;
    }
}

@media (max-width: 768px) {
    .control-panel,
    .preview-panel {
        padding: 18px;
    }

    .panel-head h1 {
        font-size: 24px;
    }
}