* {
    box-sizing: border-box;
    font-family: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

:root {
    /* Dark UI base */
    --bg: #0f0f12;
    --bg-alt: #191a1f;
    --panel: #1f2026;
    --panel-border: #2a2c34;
    /* Pastel red palette (Acrobat inspired) */
    --accent: #e55050;
    /* primary accent */
    --accent-hover: #ff6464;
    --accent-fade: rgba(229, 80, 80, 0.18);
    --accent-glow: 0 0 0 3px rgba(229, 80, 80, 0.35);
    --text: #f2f5f7;
    --muted: #9aa1ad;
    --focus-ring: 0 0 0 3px rgba(229, 80, 80, 0.45);
    --danger: #ff7878;
    --success: #3fbf80;
    --warn: #ffb347;
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 14px;
    --transition: .22s cubic-bezier(.4, 0, .2, 1);
    --shadow-soft: 0 2px 4px -1px rgba(0, 0, 0, .4), 0 4px 12px -2px rgba(0, 0, 0, .3);
}

body {
    margin: 0;
    background: linear-gradient(135deg, #0d0d10, #14151a 55%, #1b1c22);
    color: var(--text);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
}

header,
footer {
    padding: 1rem 2rem;
    background: var(--bg-alt);
    border-bottom: 1px solid var(--panel-border);
}

footer {
    border-top: 1px solid var(--panel-border);
    border-bottom: none;
}

header h1 {
    margin: 0;
    font-size: 1.35rem;
    letter-spacing: .5px;
    font-weight: 600;
    background: linear-gradient(90deg, var(--accent), var(--accent-hover));
    background-clip: text;
    -webkit-background-clip: text;
    color: transparent;
}

.brand {
    display: flex;
    align-items: center;
    gap: .9rem;
}

.logo {
    width: 40px;
    height: 40px;
    border-radius: 10px;
    box-shadow: 0 2px 6px -2px rgba(0, 0, 0, .6), 0 0 0 1px rgba(255, 255, 255, .05);
    object-fit: cover;
    background: #262830;
}

.logo:focus-visible {
    outline: none;
    box-shadow: var(--focus-ring);
}

main {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 2rem
}

form {
    width: 100%;
    max-width: 620px;
    display: flex;
    flex-direction: column;
    gap: 1.1rem;
}

.dropzone {
    border: 2px dashed var(--accent);
    border-radius: var(--radius-lg);
    padding: 2.75rem 2.5rem;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    background: var(--panel);
    position: relative;
    box-shadow: var(--shadow-soft);
}

.dropzone.drag {
    background: var(--accent-fade);
    border-color: var(--accent-hover);
}

.muted {
    color: var(--muted);
    font-size: .8rem;
}

.controls {
    display: flex;
    gap: 1.1rem;
    align-items: flex-start;
    justify-content: space-between;
    background: var(--panel);
    border: 1px solid var(--panel-border);
    padding: 1rem 1.25rem;
    border-radius: var(--radius-md);
    flex-wrap: wrap;
}

.controls label {
    display: flex;
    flex-direction: column;
    font-size: .75rem;
    text-transform: uppercase;
    letter-spacing: .5px;
    gap: .45rem;
    color: var(--muted);
    font-weight: 600;
    min-width: 120px;
}

.field-inline {
    flex-direction: row !important;
    align-items: center;
    gap: .5rem !important;
    text-transform: none !important;
    font-size: .8rem !important;
}

select,
button,
input[type=number] {
    font-size: .95rem;
    font-weight: 500;
}

button {
    background: var(--accent);
    color: #fff;
    border: none;
    padding: .8rem 1.4rem;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-weight: 600;
    line-height: 1.1;
    position: relative;
    transition: var(--transition);
    box-shadow: 0 2px 0 0 rgba(0, 0, 0, .4);
}

button:hover:not([disabled]) {
    background: var(--accent-hover);
}

button:active:not([disabled]) {
    transform: translateY(1px);
}

button:focus-visible {
    outline: none;
    box-shadow: var(--focus-ring);
}

button[disabled] {
    background: #343840;
    cursor: not-allowed;
    opacity: .55;
}

select,
input[type=number] {
    background: #262830;
    border: 1px solid #343840;
    color: var(--text);
    padding: .55rem .65rem;
    border-radius: var(--radius-sm);
    transition: var(--transition);
    min-width: 80px;
}

select:hover,
input[type=number]:hover {
    border-color: var(--accent);
}

select:focus-visible,
input[type=number]:focus-visible {
    outline: none;
    border-color: var(--accent-hover);
    box-shadow: var(--focus-ring);
}

/* Remove number input arrows for cleaner look */
input[type=number]::-webkit-outer-spin-button,
input[type=number]::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

input[type=number] {
    -moz-appearance: textfield;
    appearance: textfield;
}

/* Custom checkbox */
.checkbox-wrap {
    position: relative;
    display: inline-flex;
    align-items: center;
    gap: .55rem;
    cursor: pointer;
    font-size: .8rem;
    color: var(--text);
    user-select: none;
}

.checkbox-wrap input {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}

.checkbox-box {
    width: 20px;
    height: 20px;
    border-radius: 5px;
    border: 2px solid var(--accent);
    display: flex;
    align-items: center;
    justify-content: center;
    background: #262830;
    transition: var(--transition);
    box-shadow: inset 0 0 0 0 var(--accent);
}

.checkbox-wrap:hover .checkbox-box {
    background: #2c2f38;
}

.checkbox-wrap input:focus-visible+.checkbox-box {
    box-shadow: var(--focus-ring);
}

.checkbox-wrap input:checked+.checkbox-box {
    background: var(--accent);
    border-color: var(--accent-hover);
    box-shadow: inset 0 0 0 2px #262830;
}

.checkbox-box svg {
    width: 14px;
    height: 14px;
    stroke: #fff;
    stroke-width: 3;
    stroke-linecap: round;
    stroke-linejoin: round;
    fill: none;
    transform: scale(.6);
    opacity: 0;
    transition: var(--transition);
}

.checkbox-wrap input:checked+.checkbox-box svg {
    transform: scale(.95);
    opacity: 1;
}

.status {
    margin-top: 2.25rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.hidden {
    display: none
}

.spinner {
    width: 50px;
    height: 50px;
    border: 5px solid #2f333a;
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin .9s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg)
    }
}

footer {
    font-size: .7rem;
    text-align: center;
    opacity: .55;
}

/* Responsive tweaks */
@media (max-width: 640px) {
    .controls {
        flex-direction: column;
        align-items: stretch;
    }

    .controls label {
        width: 100%;
    }

    button {
        width: 100%;
    }
}