:root {
    --accent: #FFD700;
    --bg: #000000;
    --text: #ffffff;
    --text-dim: rgba(255, 255, 255, 0.7);
    --text-faint: rgba(255, 255, 255, 0.4);
    --border: rgba(255, 255, 255, 0.08);
    --border-strong: rgba(255, 255, 255, 0.15);
    --font: 'Urbanist', sans-serif;
    --ease: cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    background: var(--bg);
    color: var(--text);
    font-family: var(--font);
    font-weight: 300;
    -webkit-font-smoothing: antialiased;
    min-height: 100vh;
    overflow-x: hidden;
}

::selection {
    background: var(--accent);
    color: #000;
}

::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: #000;
}

::-webkit-scrollbar-thumb {
    background: var(--accent);
    border-radius: 3px;
}

.sprite {
    position: absolute;
    width: 0;
    height: 0;
    overflow: hidden;
}

.icon {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

/* ---------- Grid canvas background ---------- */
#grid-canvas {
    position: fixed;
    inset: 0;
    z-index: 0;
    pointer-events: none;
    opacity: 0.9;
}

/* ---------- Custom cursor ---------- */
#cursor-dot,
#cursor-ring {
    position: fixed;
    top: 0;
    left: 0;
    pointer-events: none;
    z-index: 200;
    border-radius: 50%;
    will-change: transform;
}

#cursor-dot {
    width: 6px;
    height: 6px;
    background: var(--accent);
    margin: -3px 0 0 -3px;
}

#cursor-ring {
    width: 34px;
    height: 34px;
    margin: -17px 0 0 -17px;
    border: 1px solid rgba(255, 215, 0, 0.5);
    transition: width 0.25s var(--ease), height 0.25s var(--ease),
                margin 0.25s var(--ease), border-color 0.25s var(--ease);
}

#cursor-ring.is-hover {
    width: 52px;
    height: 52px;
    margin: -26px 0 0 -26px;
    border-color: rgba(255, 215, 0, 0.9);
    background: rgba(255, 215, 0, 0.06);
}

@media (hover: none), (pointer: coarse) {
    #cursor-dot, #cursor-ring { display: none; }
}

/* ---------- Loader ---------- */
#loader {
    position: fixed;
    inset: 0;
    z-index: 300;
    background: var(--bg);
    display: grid;
    place-items: center;
}

#loader.is-done .loader-inner {
    transition: opacity 1s cubic-bezier(0.4, 0, 0.2, 1), transform 1s cubic-bezier(0.16, 1, 0.3, 1);
}

#loader.is-done .loader-inner {
    opacity: 0;
    transform: scale(1.05);
}

.loader-inner {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 18px;
}

.loader-mark {
    width: 56px;
    height: 56px;
    display: grid;
    place-items: center;
    border: 1px solid var(--border-strong);
    border-radius: 14px;
    color: var(--accent);
    animation: loader-pulse 1.6s var(--ease) infinite;
}

.loader-mark .icon {
    width: 28px;
    height: 28px;
}

.loader-name {
    font-size: 1.4rem;
    font-weight: 500;
    letter-spacing: 0.35em;
    text-transform: uppercase;
    margin-left: 0.35em;
}

.loader-dot {
    color: var(--accent);
}

.loader-bar {
    width: 180px;
    height: 1px;
    background: var(--border);
    overflow: hidden;
}

.loader-bar-fill {
    display: block;
    width: 100%;
    height: 100%;
    background: var(--accent);
    transform: scaleX(0);
    transform-origin: left center;
}

@keyframes loader-pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.55; transform: scale(0.94); }
}

/* ---------- Header ---------- */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 22px 28px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: var(--text);
}

.logo-mark {
    width: 34px;
    height: 34px;
    display: grid;
    place-items: center;
    border: 1px solid var(--border-strong);
    border-radius: 9px;
    color: var(--accent);
}

.logo-mark .icon {
    width: 18px;
    height: 18px;
}

.logo-name {
    font-size: 1.05rem;
    font-weight: 500;
    letter-spacing: 0.3em;
    text-transform: uppercase;
    margin-left: 0.3em;
}

.logo-dot {
    color: var(--accent);
}

.header-right {
    display: flex;
    align-items: center;
    gap: 18px;
}

.lang-switch {
    display: flex;
    align-items: center;
    gap: 10px;
}

.lang-switch-fixed {
    position: fixed;
    bottom: 24px;
    left: 24px;
    z-index: 200;
    padding: 8px 16px;
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border-strong);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.lang-btn {
    background: none;
    border: none;
    color: var(--text-faint);
    font-family: var(--font);
    font-size: 0.8rem;
    font-weight: 500;
    letter-spacing: 0.2em;
    cursor: pointer;
    transition: color 0.25s var(--ease);
    padding: 4px 2px;
}

.lang-btn.is-active {
    color: var(--accent);
}

.lang-sep {
    width: 1px;
    height: 14px;
    background: var(--border-strong);
}

/* ---------- Hero ---------- */
.hero {
    position: relative;
    z-index: 1;
    text-align: center;
    padding: 170px 24px 40px;
}

.hero-eyebrow {
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.45em;
    color: var(--text-dim);
    margin-bottom: 22px;
}

.hero-title {
    font-size: clamp(4rem, 13vw, 11rem);
    font-weight: 200;
    letter-spacing: 0.08em;
    line-height: 1;
    user-select: none;
}

.hero-dot {
    color: var(--accent);
}

.hero-sub {
    margin-top: 20px;
    font-size: 1.1rem;
    font-weight: 300;
    color: var(--text-dim);
    letter-spacing: 0.02em;
}

/* ---------- App shell ---------- */
.app-shell {
    position: relative;
    z-index: 1;
    max-width: 1180px;
    margin: 0 auto;
    padding: 40px 24px 80px;
}

.glass {
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border);
    border-radius: 24px;
    padding: clamp(24px, 4vw, 48px);
}

/* ---------- Mode switch ---------- */
.mode-switch {
    display: inline-flex;
    gap: 4px;
    padding: 4px;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border);
    border-radius: 12px;
    margin-bottom: 28px;
}

.mode-btn {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 22px;
    background: none;
    border: none;
    border-radius: 9px;
    color: var(--text-faint);
    font-family: var(--font);
    font-size: 0.82rem;
    font-weight: 500;
    letter-spacing: 0.22em;
    cursor: pointer;
    transition: all 0.3s var(--ease);
}

.mode-btn .icon {
    width: 17px;
    height: 17px;
}

.mode-btn.is-active {
    background: var(--accent);
    color: #000;
}

/* ---------- Dropzone ---------- */
.dropzone {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 12px;
    min-height: 240px;
    border: 1px dashed var(--border-strong);
    border-radius: 16px;
    background: rgba(255, 255, 255, 0.02);
    cursor: pointer;
    transition: border-color 0.3s var(--ease), background 0.3s var(--ease);
    text-align: center;
    padding: 32px 20px;
}

.dropzone:hover,
.dropzone.is-dragover {
    border-color: var(--accent);
    background: rgba(255, 215, 0, 0.04);
}

.dropzone-icon {
    width: 34px;
    height: 34px;
    color: var(--text-dim);
    transition: color 0.3s var(--ease);
}

.dropzone:hover .dropzone-icon {
    color: var(--accent);
}

.dropzone-title {
    font-size: 1.15rem;
    font-weight: 400;
}

.dropzone-sub {
    font-size: 0.85rem;
    color: var(--text-faint);
    letter-spacing: 0.05em;
}

.dropzone-btn {
    margin-top: 10px;
    padding: 10px 28px;
    border: 1px solid var(--border-strong);
    border-radius: 999px;
    font-size: 0.78rem;
    font-weight: 500;
    letter-spacing: 0.25em;
    color: var(--text);
    transition: all 0.3s var(--ease);
}

.dropzone:hover .dropzone-btn {
    border-color: var(--accent);
    color: var(--accent);
}

.dropzone-file {
    display: flex;
    align-items: center;
    gap: 14px;
    width: 100%;
    max-width: 560px;
    padding: 14px 18px;
    border: 1px solid var(--border);
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.03);
    text-align: left;
}

.dropzone-file .icon {
    width: 22px;
    height: 22px;
    color: var(--accent);
}

.file-name {
    font-weight: 400;
    font-size: 0.95rem;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    max-width: 200px;
}

.file-size {
    color: var(--text-faint);
    font-size: 0.8rem;
    white-space: nowrap;
}

.file-thumb {
    width: 44px;
    height: 44px;
    object-fit: cover;
    border-radius: 8px;
    border: 1px solid var(--border);
    margin-left: auto;
}

.file-clear {
    margin-left: 8px;
    background: none;
    border: none;
    color: var(--text-faint);
    cursor: pointer;
    padding: 6px;
    border-radius: 6px;
    transition: color 0.25s;
}

.file-clear:hover {
    color: var(--accent);
}

.dropzone.has-file {
    min-height: auto;
    border-style: solid;
}

.hidden {
    display: none !important;
}

/* ---------- Controls ---------- */
.controls {
    margin-top: 28px;
    border-top: 1px solid var(--border);
}

.controls-group {
    border-bottom: 1px solid var(--border);
}

.group-header {
    width: 100%;
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 18px 4px;
    background: none;
    border: none;
    color: var(--text);
    font-family: var(--font);
    cursor: pointer;
    text-align: left;
}

.group-num {
    font-size: 0.72rem;
    font-weight: 500;
    letter-spacing: 0.3em;
    color: var(--accent);
}

.group-title {
    font-size: 0.9rem;
    font-weight: 500;
    letter-spacing: 0.25em;
    flex: 1;
}

.group-chevron {
    transition: transform 0.3s var(--ease);
    color: var(--text-dim);
}

.group-header[aria-expanded="true"] .group-chevron {
    transform: rotate(180deg);
}

.group-body {
    display: none;
    padding: 4px 4px 22px;
    animation: fade-in 0.35s var(--ease);
}

.group-header[aria-expanded="true"] + .group-body {
    display: block;
}

@keyframes fade-in {
    from { opacity: 0; transform: translateY(-6px); }
    to { opacity: 1; transform: translateY(0); }
}

.field {
    margin-bottom: 18px;
}

.field-label {
    display: block;
    font-size: 0.68rem;
    font-weight: 500;
    letter-spacing: 0.22em;
    color: var(--text-dim);
    margin-bottom: 10px;
}

.slider-row {
    display: flex;
    align-items: center;
    gap: 16px;
}

.slider-val {
    min-width: 52px;
    text-align: right;
    font-size: 0.85rem;
    color: var(--accent);
    font-weight: 400;
    letter-spacing: 0.05em;
}

input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    flex: 1;
    height: 2px;
    background: linear-gradient(to right, var(--accent) var(--fill, 50%), var(--border-strong) var(--fill, 50%));
    outline: none;
    cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: #000;
    border: 2px solid var(--accent);
    transition: transform 0.2s var(--ease);
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

input[type="range"]::-moz-range-thumb {
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: #000;
    border: 2px solid var(--accent);
}

select {
    width: 100%;
    padding: 12px 14px;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border-strong);
    border-radius: 10px;
    color: var(--text);
    font-family: var(--font);
    font-size: 0.92rem;
    font-weight: 300;
    appearance: none;
    color-scheme: dark;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' fill='none' stroke='%23FFD700' stroke-width='1.5'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 14px center;
    cursor: pointer;
    outline: none;
    transition: border-color 0.25s;
}

select option {
    background: #000;
    color: var(--text);
}

select:focus {
    border-color: var(--accent);
}

/* ---------- Toggles ---------- */
.toggle {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 16px;
    cursor: pointer;
    user-select: none;
}

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

.toggle-track {
    width: 40px;
    height: 22px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid var(--border-strong);
    position: relative;
    transition: background 0.3s var(--ease);
    flex-shrink: 0;
}

.toggle-thumb {
    position: absolute;
    top: 2px;
    left: 2px;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--text-dim);
    transition: transform 0.3s var(--ease), background 0.3s var(--ease);
}

.toggle input:checked + .toggle-track {
    background: rgba(255, 215, 0, 0.18);
    border-color: var(--accent);
}

.toggle input:checked + .toggle-track .toggle-thumb {
    transform: translateX(18px);
    background: var(--accent);
}

.toggle-label {
    font-size: 0.92rem;
    font-weight: 300;
    letter-spacing: 0.02em;
}

/* ---------- Convert button ---------- */
.convert-btn {
    width: 100%;
    margin-top: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 14px;
    padding: 18px 24px;
    background: var(--accent);
    border: none;
    border-radius: 14px;
    color: #000;
    font-family: var(--font);
    font-size: 0.95rem;
    font-weight: 600;
    letter-spacing: 0.25em;
    cursor: pointer;
    transition: transform 0.25s var(--ease), box-shadow 0.25s var(--ease), opacity 0.3s;
}

.convert-btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 12px 40px rgba(255, 215, 0, 0.25);
}

.convert-btn:disabled {
    opacity: 0.35;
    cursor: not-allowed;
}

.convert-btn.is-loading .icon {
    animation: spin 0.9s linear infinite;
}

.convert-btn.is-loading .icon use {
    opacity: 0;
}

.convert-btn.is-loading::before {
    content: "";
    width: 18px;
    height: 18px;
    border: 2px solid rgba(0, 0, 0, 0.25);
    border-top-color: #000;
    border-radius: 50%;
    animation: spin 0.9s linear infinite;
}

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

/* ---------- Alert ---------- */
.alert-box {
    margin-top: 20px;
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 16px 18px;
    border: 1px solid rgba(255, 90, 90, 0.35);
    border-radius: 12px;
    background: rgba(255, 90, 90, 0.07);
    color: #ffb3b3;
    font-size: 0.92rem;
    animation: fade-in 0.3s var(--ease);
}

.alert-box .icon {
    color: #ff6b6b;
    margin-top: 1px;
}

/* ---------- Results ---------- */
.results {
    margin-top: 32px;
    animation: fade-in 0.5s var(--ease);
}

.stats {
    display: block;
    font-size: 0.8rem;
    color: var(--text-dim);
    letter-spacing: 0.04em;
    line-height: 1.7;
    margin-bottom: 10px;
}

.warnings {
    display: flex;
    flex-direction: column;
    gap: 6px;
    margin-bottom: 16px;
}

.warning-item {
    font-size: 0.8rem;
    color: var(--accent);
    letter-spacing: 0.04em;
}

.results-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 18px;
}

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

.result-card {
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 20px;
    background: rgba(255, 255, 255, 0.02);
}

.result-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 16px;
}

.result-title {
    font-size: 0.72rem;
    font-weight: 500;
    letter-spacing: 0.25em;
    color: var(--text-dim);
}

.result-badge {
    font-size: 0.62rem;
    font-weight: 500;
    letter-spacing: 0.2em;
    color: var(--accent);
    border: 1px solid rgba(255, 215, 0, 0.4);
    border-radius: 999px;
    padding: 4px 12px;
}

.preview-wrap {
    overflow: hidden;
    border-radius: 10px;
    background: rgba(0, 0, 0, 0.35);
    border: 1px solid var(--border);
    display: grid;
    place-items: center;
    height: 360px;
}

.preview-img {
    max-width: 100%;
    max-height: 100%;
    display: block;
    transform-origin: center;
    transition: transform 0.15s linear;
}

.preview-scale {
    margin-top: 18px;
}

.compare-wrap {
    display: grid;
    place-items: center;
    height: 360px;
}

.compare-fig {
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 10px;
    text-align: center;
}

.debug-img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    border-radius: 10px;
    border: 1px solid var(--border);
    background: rgba(0, 0, 0, 0.35);
    display: block;
    margin: 0 auto;
}

.compare-fig figcaption {
    margin-top: 10px;
    font-size: 0.78rem;
    color: var(--text-faint);
    letter-spacing: 0.12em;
}

.code-card {
    margin-top: 18px;
}

.result-actions {
    display: flex;
    gap: 10px;
}

.ghost-btn,
.gold-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 9px 18px;
    border-radius: 999px;
    font-family: var(--font);
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.2em;
    cursor: pointer;
    transition: all 0.25s var(--ease);
}

.ghost-btn {
    background: none;
    border: 1px solid var(--border-strong);
    color: var(--text);
}

.ghost-btn:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.gold-btn {
    background: var(--accent);
    border: 1px solid var(--accent);
    color: #000;
}

.gold-btn:hover {
    box-shadow: 0 8px 28px rgba(255, 215, 0, 0.25);
    transform: translateY(-1px);
}

.ghost-btn .icon,
.gold-btn .icon {
    width: 15px;
    height: 15px;
}

.pat-code {
    width: 100%;
    height: 260px;
    resize: vertical;
    background: rgba(0, 0, 0, 0.45);
    border: 1px solid var(--border);
    border-radius: 10px;
    color: #d8d8d8;
    font-family: 'Consolas', 'Menlo', monospace;
    font-size: 0.8rem;
    line-height: 1.55;
    padding: 16px;
    outline: none;
}

/* ---------- Footer ---------- */
.site-footer {
    position: relative;
    z-index: 1;
    max-width: 1180px;
    margin: 0 auto;
    padding: 40px 24px 60px;
    display: flex;
    flex-wrap: wrap;
    gap: 12px 24px;
    align-items: center;
    justify-content: space-between;
    font-size: 0.8rem;
    color: var(--text-faint);
    letter-spacing: 0.12em;
}

.footer-hint {
    color: var(--text-dim);
}

/* ---------- Reveals ---------- */
.reveal {
    opacity: 0;
    transform: translateY(34px);
    transition: opacity 0.9s var(--ease), transform 0.9s var(--ease);
}

.reveal.is-visible {
    opacity: 1;
    transform: translateY(0);
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }

    .reveal {
        opacity: 1;
        transform: none;
    }

    #cursor-dot, #cursor-ring {
        display: none;
    }
}