:root {
    --bg-900: #070b18;
    --bg-800: #0d1326;
    --bg-700: #141b33;
    --surface: rgba(20, 27, 51, 0.72);
    --surface-strong: rgba(20, 27, 51, 0.92);
    --border: rgba(148, 163, 184, 0.14);
    --border-strong: rgba(148, 163, 184, 0.28);
    --text: #e6ebf5;
    --text-muted: #93a0bd;
    --accent: #32bcad;
    --accent-soft: rgba(50, 188, 173, 0.18);
    --accent-strong: #2ad4c2;
    --violet: #8b5cf6;
    --pink: #ec4899;
    --success: #22c55e;
    --danger: #f43f5e;
    --radius-lg: 24px;
    --radius-md: 14px;
    --radius-sm: 10px;
    --shadow-lg: 0 30px 80px -30px rgba(5, 10, 25, 0.8);
    --shadow-md: 0 12px 40px -20px rgba(5, 10, 25, 0.7);
    --transition: 0.25s cubic-bezier(0.2, 0.8, 0.2, 1);
}

* {
    box-sizing: border-box;
}

html, body {
    margin: 0;
    padding: 0;
}

body {
    min-height: 100vh;
    font-family: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
    color: var(--text);
    background: radial-gradient(120% 120% at 50% -20%, #111a36 0%, var(--bg-900) 55%, #04060f 100%);
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding: 48px 20px 64px;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.background {
    position: fixed;
    inset: 0;
    pointer-events: none;
    overflow: hidden;
    z-index: 0;
}

.glow {
    position: absolute;
    width: 520px;
    height: 520px;
    border-radius: 50%;
    filter: blur(140px);
    opacity: 0.55;
    animation: float 14s ease-in-out infinite;
}

.glow--one {
    background: var(--accent);
    top: -160px;
    left: -120px;
}

.glow--two {
    background: var(--violet);
    bottom: -180px;
    right: -80px;
    animation-delay: -5s;
}

.glow--three {
    background: var(--pink);
    top: 40%;
    left: 55%;
    width: 360px;
    height: 360px;
    opacity: 0.35;
    animation-delay: -9s;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    50% { transform: translate(30px, -20px) scale(1.08); }
}

.app {
    position: relative;
    z-index: 1;
    width: min(1080px, 100%);
    display: flex;
    flex-direction: column;
    gap: 40px;
}

.app__header {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 28px;
    align-items: end;
}

.brand {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.brand__eyebrow {
    margin: 0 0 4px;
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--accent-strong);
}

.brand__title {
    margin: 0;
    font-size: clamp(1.6rem, 2.4vw, 2.1rem);
    font-weight: 800;
    letter-spacing: -0.02em;
    background: linear-gradient(120deg, #ffffff 0%, #c7d2fe 100%);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.app__lead {
    max-width: 360px;
    margin: 0;
    color: var(--text-muted);
    font-size: 0.95rem;
    line-height: 1.55;
    text-align: right;
}

.app__lead strong {
    color: var(--text);
    font-weight: 600;
}

.card {
    position: relative;
    display: grid;
    grid-template-columns: 1.1fr 1fr;
    gap: 0;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    backdrop-filter: blur(22px);
    -webkit-backdrop-filter: blur(22px);
    box-shadow: var(--shadow-lg);
}

.card::before {
    content: "";
    position: absolute;
    inset: 0;
    pointer-events: none;
    border-radius: inherit;
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.05), transparent 40%);
}

.form {
    padding: 40px;
    display: flex;
    flex-direction: column;
    gap: 20px;
    border-right: 1px solid var(--border);
}

.form__title {
    margin: 0 0 4px;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text);
}

.field {
    display: flex;
    flex-direction: column;
    gap: 8px;
    flex: 1;
}

.field-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.field label {
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-muted);
    letter-spacing: 0.01em;
}

.field__hint {
    font-size: 0.72rem;
    font-weight: 400;
    color: rgba(147, 160, 189, 0.7);
    margin-left: 4px;
}

.field input {
    appearance: none;
    background: rgba(7, 11, 24, 0.55);
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-sm);
    color: var(--text);
    padding: 14px 16px;
    font-size: 0.95rem;
    font-family: inherit;
    transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
}

.field input::placeholder {
    color: rgba(147, 160, 189, 0.6);
}

.field input:hover {
    border-color: rgba(148, 163, 184, 0.45);
}

.field input:focus {
    outline: none;
    border-color: var(--accent);
    background: rgba(7, 11, 24, 0.8);
    box-shadow: 0 0 0 4px var(--accent-soft);
}

.field input[aria-invalid="true"] {
    border-color: var(--danger);
    box-shadow: 0 0 0 4px rgba(244, 63, 94, 0.18);
}

.btn {
    appearance: none;
    border: none;
    cursor: pointer;
    font-family: inherit;
    font-size: 0.95rem;
    font-weight: 600;
    padding: 14px 18px;
    border-radius: var(--radius-sm);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    transition: transform var(--transition), box-shadow var(--transition), background var(--transition), color var(--transition);
}

.btn:disabled {
    cursor: not-allowed;
    opacity: 0.55;
}

.btn--primary {
    background: linear-gradient(120deg, var(--accent) 0%, var(--violet) 100%);
    color: #03111b;
    box-shadow: 0 18px 40px -18px rgba(50, 188, 173, 0.7);
    margin-top: 4px;
}

.btn--primary:hover:not(:disabled) {
    transform: translateY(-1px);
    box-shadow: 0 22px 48px -18px rgba(139, 92, 246, 0.55);
}

.btn--primary:active:not(:disabled) {
    transform: translateY(0);
}

.btn--ghost {
    background: rgba(255, 255, 255, 0.04);
    color: var(--text);
    border: 1px solid var(--border-strong);
    flex: 1;
}

.btn--ghost:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: var(--accent);
    color: var(--accent-strong);
}

.preview {
    padding: 40px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 18px;
    background:
        radial-gradient(120% 100% at 100% 0%, rgba(139, 92, 246, 0.12) 0%, transparent 55%),
        radial-gradient(120% 100% at 0% 100%, rgba(50, 188, 173, 0.14) 0%, transparent 55%);
}

.preview__placeholder {
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 14px;
    color: var(--text-muted);
    padding: 48px 20px;
    border: 1.5px dashed var(--border-strong);
    border-radius: var(--radius-md);
    text-align: center;
}

.preview__placeholder p {
    margin: 0;
    font-size: 0.92rem;
}

.preview__result {
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    animation: pop-in 0.45s cubic-bezier(0.2, 0.8, 0.2, 1);
}

@keyframes pop-in {
    0% { opacity: 0; transform: translateY(8px) scale(0.97); }
    100% { opacity: 1; transform: translateY(0) scale(1); }
}

.preview__badge {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--accent-strong);
    background: var(--accent-soft);
    border: 1px solid rgba(50, 188, 173, 0.3);
    padding: 6px 14px;
    border-radius: 999px;
    letter-spacing: 0.02em;
}

.preview__code {
    background: white;
    padding: 16px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    line-height: 0;
}

.preview__code img,
.preview__code canvas {
    display: block;
    border-radius: 6px;
}

.preview__name {
    margin: 0;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text);
    letter-spacing: 0.01em;
    text-align: center;
}

.preview__payload {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.preview__payload label {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.preview__payload textarea {
    resize: none;
    width: 100%;
    font-family: "JetBrains Mono", ui-monospace, Menlo, monospace;
    font-size: 0.78rem;
    line-height: 1.5;
    color: var(--text);
    background: rgba(7, 11, 24, 0.7);
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-sm);
    padding: 12px 14px;
    word-break: break-all;
}

.preview__actions {
    display: flex;
    gap: 10px;
    width: 100%;
}

.toast {
    position: fixed;
    bottom: 32px;
    left: 50%;
    transform: translateX(-50%) translateY(12px);
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 12px 18px;
    border-radius: 999px;
    background: rgba(13, 19, 38, 0.95);
    border: 1px solid var(--border-strong);
    color: var(--text);
    font-size: 0.9rem;
    font-weight: 500;
    box-shadow: var(--shadow-md);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition), transform var(--transition);
    z-index: 10;
}

.toast[data-open="true"] {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

.toast svg {
    color: var(--success);
}

.toast--error svg {
    color: var(--danger);
}

@media (max-width: 880px) {
    .card {
        grid-template-columns: 1fr;
    }

    .form {
        border-right: none;
        border-bottom: 1px solid var(--border);
        padding: 32px 28px;
    }

    .preview {
        padding: 32px 28px;
    }

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

    .app__lead {
        text-align: left;
    }
}

@media (max-width: 480px) {
    body {
        padding: 28px 14px 48px;
    }

    .field-row {
        grid-template-columns: 1fr;
    }

    .preview__actions {
        flex-direction: column;
    }
}