:root {
    --bg: #07111f;
    --bg-secondary: #0e1a2f;
    --panel: rgba(10, 20, 38, 0.84);
    --panel-strong: rgba(13, 26, 48, 0.95);
    --line: rgba(125, 172, 255, 0.18);
    --line-strong: rgba(125, 172, 255, 0.4);
    --text: #eef4ff;
    --muted: #9eb2d8;
    --accent: #77b4ff;
    --accent-strong: #9fd4ff;
    --success: #7be0a8;
    --error: #ff9b9b;
    --shadow: 0 24px 60px rgba(0, 0, 0, 0.35);
    --radius-xl: 28px;
    --radius-lg: 20px;
    --radius-md: 14px;
}

* {
    box-sizing: border-box;
}

html, body {
    margin: 0;
    min-height: 100%;
}

body {
    font-family: Inter, "Segoe UI", Roboto, Arial, sans-serif;
    color: var(--text);
    background:
        radial-gradient(circle at top, rgba(74, 126, 255, 0.18), transparent 35%),
        linear-gradient(180deg, #06101d 0%, #091424 45%, #07111f 100%);
}

body::before {
    content: "";
    position: fixed;
    inset: 0;
    pointer-events: none;
    background:
        linear-gradient(rgba(255,255,255,0.02) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.02) 1px, transparent 1px);
    background-size: 40px 40px;
    mask-image: linear-gradient(to bottom, rgba(0,0,0,0.4), rgba(0,0,0,1));
}

.app-shell {
    width: min(1120px, calc(100% - 32px));
    margin: 0 auto;
    padding: 36px 0 56px;
}

.hero-card,
.panel {
    position: relative;
    overflow: hidden;
    border: 1px solid var(--line);
    background: linear-gradient(180deg, rgba(17, 29, 50, 0.9), rgba(8, 17, 31, 0.94));
    box-shadow: var(--shadow);
}

.hero-card {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 24px;
    align-items: center;
    padding: 28px;
    border-radius: var(--radius-xl);
}

.hero-card::after,
.panel::after {
    content: "";
    position: absolute;
    inset: 0;
    pointer-events: none;
    background: linear-gradient(135deg, rgba(119, 180, 255, 0.08), transparent 35%, rgba(255, 255, 255, 0.02));
}

.eyebrow {
    margin: 0 0 10px;
    text-transform: uppercase;
    letter-spacing: 0.16em;
    font-size: 0.74rem;
    color: var(--accent-strong);
}

h1 {
    margin: 0;
    font-size: clamp(2rem, 4vw, 3.5rem);
    line-height: 1.02;
}

.hero-text,
.panel-header p,
.drop-zone-content span,
.status-message {
    color: var(--muted);
}

.hero-text {
    max-width: 58ch;
    font-size: 1rem;
    line-height: 1.7;
    margin: 16px 0 0;
}

.hero-art-wrap {
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-art {
    width: min(100%, 430px);
    height: auto;
    display: block;
    border-radius: 24px;
    border: 1px solid rgba(255,255,255,0.08);
    box-shadow: 0 18px 40px rgba(0, 0, 0, 0.3);
}

.panel {
    margin-top: 28px;
    padding: 28px;
    border-radius: var(--radius-xl);
}

.panel-header h2 {
    margin: 0 0 8px;
    font-size: 1.4rem;
}

.panel-header p {
    margin: 0 0 22px;
}

.drop-zone {
    display: block;
    width: 100%;
    min-height: 180px;
    border: 1.5px dashed var(--line-strong);
    border-radius: 24px;
    background: linear-gradient(180deg, rgba(119, 180, 255, 0.07), rgba(119, 180, 255, 0.03));
    cursor: pointer;
    transition: transform 180ms ease, border-color 180ms ease, background 180ms ease, box-shadow 180ms ease;
}

.drop-zone:hover,
.drop-zone.dragover {
    transform: translateY(-2px);
    border-color: rgba(159, 212, 255, 0.75);
    background: linear-gradient(180deg, rgba(119, 180, 255, 0.12), rgba(119, 180, 255, 0.06));
    box-shadow: 0 10px 24px rgba(52, 103, 182, 0.18);
}

.drop-zone input {
    position: absolute;
    opacity: 0;
    pointer-events: none;
}

.drop-zone-content {
    min-height: 180px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 16px;
    text-align: center;
    padding: 20px;
}

.drop-zone-content strong,
label {
    color: var(--text);
}

.drop-zone-content strong {
    display: block;
    font-size: 1.06rem;
}

.drop-zone-content span {
    display: block;
    margin-top: 6px;
    font-size: 0.95rem;
}

.drop-icon {
    width: 62px;
    height: 62px;
    border-radius: 18px;
    display: grid;
    place-items: center;
    color: var(--accent-strong);
    background: rgba(119, 180, 255, 0.08);
    border: 1px solid rgba(119, 180, 255, 0.18);
}

.drop-icon svg,
.icon-btn svg {
    width: 28px;
    height: 28px;
}

.controls-grid {
    display: grid;
    grid-template-columns: 220px minmax(0, 1fr);
    gap: 18px;
    margin-top: 22px;
}

.field-block {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.field-block-wide {
    min-width: 0;
}

label {
    font-size: 0.95rem;
    font-weight: 600;
}

input[type="number"],
input[type="text"] {
    width: 100%;
    border: 1px solid rgba(125, 172, 255, 0.18);
    background: rgba(255, 255, 255, 0.04);
    color: var(--text);
    border-radius: 16px;
    padding: 14px 16px;
    font-size: 1rem;
    outline: none;
    transition: border-color 180ms ease, box-shadow 180ms ease, background 180ms ease;
}

input[type="number"]:focus,
input[type="text"]:focus {
    border-color: rgba(159, 212, 255, 0.75);
    box-shadow: 0 0 0 4px rgba(119, 180, 255, 0.12);
    background: rgba(255, 255, 255, 0.06);
}

.hash-output-wrap {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 10px;
    align-items: center;
}

#hash-output {
    font-family: "Cascadia Code", "Consolas", monospace;
    letter-spacing: 0.01em;
}

.icon-btn {
    flex: 0 0 auto;
    width: 54px;
    height: 54px;
    border-radius: 16px;
    border: 1px solid rgba(125, 172, 255, 0.24);
    background: linear-gradient(180deg, rgba(119, 180, 255, 0.18), rgba(119, 180, 255, 0.08));
    color: var(--accent-strong);
    cursor: pointer;
    transition: transform 180ms ease, border-color 180ms ease, background 180ms ease;
}

.icon-btn:hover {
    transform: translateY(-1px);
    border-color: rgba(159, 212, 255, 0.75);
    background: linear-gradient(180deg, rgba(119, 180, 255, 0.26), rgba(119, 180, 255, 0.14));
}

.icon-btn:active {
    transform: translateY(0);
}

.status-message {
    min-height: 24px;
    margin-top: 18px;
    font-size: 0.96rem;
}

.status-message.success {
    color: var(--success);
}

.status-message.error {
    color: var(--error);
}

.status-message.working {
    color: var(--accent-strong);
}

@media (max-width: 860px) {
    .hero-card {
        grid-template-columns: 1fr;
    }

    .hero-art {
        width: min(100%, 360px);
    }

    .controls-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 560px) {
    .app-shell {
        width: min(100% - 20px, 1120px);
        padding: 20px 0 32px;
    }

    .hero-card,
    .panel {
        padding: 20px;
        border-radius: 22px;
    }

    .drop-zone,
    .drop-zone-content {
        min-height: 156px;
    }

    .hash-output-wrap {
        grid-template-columns: 1fr;
    }

    .icon-btn {
        width: 100%;
        height: 48px;
    }
}