:root {
    --bg: #ffffff;
    --ink: #0f1720;
    --muted: #697586;
    --line: #d8dde4;
    --line-strong: #b8c1cc;
    --soft: #f5f7fa;
    --soft-2: #eef2f6;
    --accent: #000000;
    --radius-lg: 22px;
    --radius-md: 16px;
    --shadow: 0 16px 45px rgba(15, 23, 32, 0.08);
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    background: var(--bg);
    color: var(--ink);
    font-family: "Segoe UI", Arial, sans-serif;
}

img {
    max-width: 100%;
    display: block;
}

a {
    color: inherit;
}

button,
input,
textarea,
select {
    font: inherit;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.hidden {
    display: none !important;
}

.app-shell {
    max-width: 1080px;
    margin: 0 auto;
    padding: 24px 18px 56px;
}

.app-topbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
}

.app-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
}

.app-brand img {
    height: 52px;
}

.app-brand small {
    display: block;
    color: var(--muted);
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.app-brand strong {
    display: block;
    font-size: 1.2rem;
}

.ghost-link {
    padding: 12px 18px;
    border: 1px solid var(--line);
    border-radius: 999px;
    text-decoration: none;
    background: #fff;
}

.progress-wrap {
    display: flex;
    align-items: center;
    gap: 16px;
    max-width: 860px;
    margin: 34px auto 26px;
}

.progress-bar {
    flex: 1;
    height: 12px;
    border-radius: 999px;
    background: #d8d8d8;
    overflow: hidden;
    border: 1px solid #a7adb3;
}

.progress-bar-fill {
    height: 100%;
    border-radius: 999px;
    background: #000;
    transition: width 0.25s ease;
}

.progress-label {
    min-width: 42px;
    font-size: 0.9rem;
}

.wizard,
.status-screen {
    max-width: 900px;
    margin: 0 auto;
}

.step-card,
.status-card,
.result-panel {
    animation: fadeUp 0.25s ease;
}

.step-copy {
    max-width: 720px;
    margin: 0 auto 24px;
}

.step-copy h1,
.step-copy h2 {
    margin: 0 0 12px;
    text-align: center;
    font-size: clamp(2rem, 4vw, 3.2rem);
    line-height: 1.02;
}

.step-copy p {
    margin: 0;
    text-align: center;
    color: var(--muted);
    font-size: 1.06rem;
    line-height: 1.65;
}

.center-copy {
    max-width: 620px;
}

.form-copy h2 {
    font-size: clamp(1.8rem, 3.5vw, 2.5rem);
}

.upload-stage {
    display: block;
    border: 2px dashed var(--line-strong);
    background: #fafafa;
    border-radius: 28px;
    min-height: 520px;
    cursor: pointer;
    transition: border-color 0.2s ease, background 0.2s ease;
}

.mask-editor {
    max-width: 920px;
    margin: 0 auto;
}

.mask-stage {
    position: relative;
    border-radius: 28px;
    overflow: hidden;
    border: 1px solid var(--line);
    background: #f8fafc;
}

.mask-stage img {
    width: 100%;
    display: block;
}

.mask-stage canvas {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    cursor: crosshair;
    opacity: 0.45;
}

.mask-toolbar {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    align-items: center;
    justify-content: center;
    margin-top: 16px;
}

.mask-help {
    text-align: center;
    color: var(--muted);
    margin: 16px auto 0;
    max-width: 56ch;
    line-height: 1.6;
}

.is-button {
    cursor: pointer;
}

.is-button.active {
    border-color: #000;
    box-shadow: 0 0 0 1px #000 inset;
}

.brush-size {
    display: grid;
    gap: 6px;
    font-weight: 600;
}

.brush-size input {
    width: 220px;
}

.upload-stage.dragging {
    border-color: #000;
    background: #f0f3f7;
}

.upload-empty {
    min-height: 520px;
    display: grid;
    place-items: center;
    text-align: center;
    padding: 32px;
    gap: 14px;
}

.upload-empty strong {
    font-size: 2rem;
    max-width: 16ch;
    line-height: 1.12;
}

.upload-empty span {
    color: var(--muted);
    max-width: 48ch;
    line-height: 1.6;
}

.upload-icon {
    width: 74px;
    height: 74px;
    display: grid;
    place-items: center;
    border-radius: 22px;
    background: var(--soft-2);
    font-size: 2.4rem;
}

.upload-actions {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
}

.primary-pill,
.secondary-pill,
.selection-pill {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 14px;
    padding: 12px 18px;
    font-weight: 600;
}

.primary-pill {
    background: #000;
    color: #fff;
}

.secondary-pill,
.selection-pill {
    border: 1px solid var(--line);
    background: #fff;
}

.upload-preview {
    position: relative;
    overflow: hidden;
    min-height: 520px;
    border-radius: 28px;
}

.upload-preview img {
    width: 100%;
    height: 520px;
    object-fit: cover;
}

.preview-overlay {
    position: absolute;
    inset: auto 18px 18px 18px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
}

.preview-tag {
    padding: 12px 14px;
    border-radius: 14px;
    background: rgba(0, 0, 0, 0.72);
    color: #fff;
    font-weight: 600;
}

.step-actions {
    margin-top: 28px;
    display: flex;
    gap: 14px;
    align-items: center;
}

.step-actions.center {
    justify-content: center;
}

.step-actions.stack {
    flex-direction: column;
    justify-content: center;
}

.primary-button {
    min-width: 320px;
    border: 0;
    border-radius: 12px;
    padding: 17px 28px;
    background: #000;
    color: #fff;
    font-weight: 700;
    cursor: pointer;
}

.primary-button.compact {
    min-width: 0;
    padding-inline: 22px;
    text-decoration: none;
}

.back-link {
    border: 0;
    background: transparent;
    color: var(--ink);
    cursor: pointer;
}

.selection-strip {
    margin-top: 24px;
    display: flex;
    justify-content: center;
    gap: 10px;
    flex-wrap: wrap;
}

.option-grid {
    display: grid;
    gap: 14px;
}

.option-grid-materials {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    max-width: 870px;
    margin: 0 auto;
}

.option-grid-profiles {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    max-width: 870px;
    margin: 0 auto;
}

.option-grid-colors {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    max-width: 870px;
    margin: 0 auto;
    max-height: 500px;
    overflow-y: auto;
    padding-right: 6px;
}

.option-card {
    position: relative;
    border: 1px solid var(--line);
    background: #fff;
    border-radius: 18px;
    padding: 0 0 14px;
    cursor: pointer;
    overflow: hidden;
    transition: transform 0.15s ease, border-color 0.15s ease, box-shadow 0.15s ease;
}

.option-card:hover {
    transform: translateY(-2px);
}

.option-card.selected {
    border-color: #000;
    box-shadow: 0 0 0 2px #000 inset;
}

.option-card strong {
    display: block;
    text-align: center;
    padding-top: 12px;
    font-size: 1.1rem;
}

.option-card-color strong {
    font-size: 1rem;
}

.option-card-detail strong {
    font-size: 1rem;
}

.option-badge {
    position: absolute;
    top: 10px;
    right: 10px;
    z-index: 2;
    padding: 5px 10px;
    border-radius: 999px;
    background: #fff;
    font-size: 0.75rem;
    border: 1px solid var(--line);
}

.option-swatch,
.color-swatch {
    display: block;
    width: 100%;
}

.option-swatch {
    height: 240px;
}

.color-swatch {
    height: 170px;
}

.shingles {
    background:
        linear-gradient(0deg, rgba(0, 0, 0, 0.06), rgba(0, 0, 0, 0.06)),
        linear-gradient(180deg, #d9c39d 0 33%, #c9b18d 33% 66%, #d7c098 66% 100%);
    background-size: 100% 58px;
}

.tile {
    background:
        radial-gradient(circle at 20% 50%, #d7a488 0 18%, transparent 19%),
        radial-gradient(circle at 50% 50%, #c8886c 0 18%, transparent 19%),
        radial-gradient(circle at 80% 50%, #b8745f 0 18%, transparent 19%),
        linear-gradient(180deg, #e4bea4, #b97861);
    background-size: 90px 72px;
}

.metal {
    background:
        linear-gradient(90deg, transparent 0 16%, rgba(0, 0, 0, 0.28) 16% 17%, transparent 17% 49%, rgba(0, 0, 0, 0.28) 49% 50%, transparent 50% 82%, rgba(0, 0, 0, 0.28) 82% 83%, transparent 83% 100%),
        linear-gradient(180deg, #efe8df, #d9ccc0);
}

.detail-shingle-architectural {
    background:
        linear-gradient(0deg, rgba(0, 0, 0, 0.08), rgba(0, 0, 0, 0.08)),
        linear-gradient(180deg, #b9a07b 0 33%, #917c5d 33% 66%, #c8b18d 66% 100%);
    background-size: 100% 54px;
}

.detail-shingle-designer {
    background:
        linear-gradient(135deg, rgba(0, 0, 0, 0.07), rgba(255, 255, 255, 0.06)),
        linear-gradient(180deg, #8b7262 0 50%, #645245 50% 100%);
    background-size: 100% 58px;
}

.detail-shingle-dimensional {
    background:
        linear-gradient(0deg, rgba(0, 0, 0, 0.07), rgba(0, 0, 0, 0.07)),
        linear-gradient(180deg, #7a7f82 0 33%, #5f666c 33% 66%, #91979b 66% 100%);
    background-size: 100% 52px;
}

.detail-tile-barrel {
    background:
        radial-gradient(circle at 20% 50%, #d7a488 0 18%, transparent 19%),
        radial-gradient(circle at 50% 50%, #c8886c 0 18%, transparent 19%),
        radial-gradient(circle at 80% 50%, #b8745f 0 18%, transparent 19%),
        linear-gradient(180deg, #e4bea4, #b97861);
    background-size: 90px 72px;
}

.detail-tile-flat {
    background:
        linear-gradient(90deg, rgba(255, 255, 255, 0.16) 0 4%, transparent 4% 24%, rgba(255, 255, 255, 0.16) 24% 28%, transparent 28% 48%, rgba(255, 255, 255, 0.16) 48% 52%, transparent 52% 72%, rgba(255, 255, 255, 0.16) 72% 76%, transparent 76% 100%),
        linear-gradient(180deg, #b9a392, #8b7666);
}

.detail-tile-slate {
    background:
        linear-gradient(180deg, rgba(255, 255, 255, 0.08), rgba(0, 0, 0, 0.08)),
        linear-gradient(180deg, #90959b 0 50%, #60666c 50% 100%);
    background-size: 100% 42px;
}

.detail-metal-15 {
    background:
        linear-gradient(90deg, transparent 0 18%, rgba(0, 0, 0, 0.28) 18% 19%, transparent 19% 50%, rgba(0, 0, 0, 0.28) 50% 51%, transparent 51% 82%, rgba(0, 0, 0, 0.28) 82% 83%, transparent 83% 100%),
        linear-gradient(180deg, #efe3db, #d1c3ba);
}

.detail-metal-10 {
    background:
        linear-gradient(90deg, transparent 0 22%, rgba(0, 0, 0, 0.24) 22% 23%, transparent 23% 48%, rgba(0, 0, 0, 0.24) 48% 49%, transparent 49% 74%, rgba(0, 0, 0, 0.24) 74% 75%, transparent 75% 100%),
        linear-gradient(180deg, #6f8ea8, #3c5971);
}

.detail-metal-rib {
    background:
        linear-gradient(90deg, transparent 0 10%, rgba(0, 0, 0, 0.22) 10% 11%, transparent 11% 23%, rgba(0, 0, 0, 0.22) 23% 24%, transparent 24% 36%, rgba(0, 0, 0, 0.22) 36% 37%, transparent 37% 49%, rgba(0, 0, 0, 0.22) 49% 50%, transparent 50% 62%, rgba(0, 0, 0, 0.22) 62% 63%, transparent 63% 75%, rgba(0, 0, 0, 0.22) 75% 76%, transparent 76% 88%, rgba(0, 0, 0, 0.22) 88% 89%, transparent 89% 100%),
        linear-gradient(180deg, #7fb2a6, #477a6f);
}

.detail-metal-5v {
    background:
        radial-gradient(circle at 14% 18%, #7a736d 0 2%, transparent 2.4%),
        radial-gradient(circle at 43% 33%, #7a736d 0 2%, transparent 2.4%),
        radial-gradient(circle at 73% 47%, #7a736d 0 2%, transparent 2.4%),
        radial-gradient(circle at 87% 66%, #7a736d 0 2%, transparent 2.4%),
        linear-gradient(90deg, transparent 0 10%, rgba(0, 0, 0, 0.18) 10% 11%, transparent 11% 25%, rgba(0, 0, 0, 0.18) 25% 26%, transparent 26% 40%, rgba(0, 0, 0, 0.18) 40% 41%, transparent 41% 55%, rgba(0, 0, 0, 0.18) 55% 56%, transparent 56% 70%, rgba(0, 0, 0, 0.18) 70% 71%, transparent 71% 85%, rgba(0, 0, 0, 0.18) 85% 86%, transparent 86% 100%),
        linear-gradient(180deg, #ddd0be, #b8aa98);
}

.sand { background: linear-gradient(180deg, #d9c39d, #c7b084); }
.light-gray { background: linear-gradient(180deg, #d8dbe0, #b8bdc7); }
.chestnut { background: linear-gradient(180deg, #8f5a37, #593624); }
.green { background: linear-gradient(180deg, #64745f, #334036); }
.brown-blend { background: linear-gradient(180deg, #8a6347, #5c4131); }
.earth { background: linear-gradient(180deg, #88755c, #5e5240); }
.gray-blend { background: linear-gradient(180deg, #899190, #58615f); }
.navy { background: linear-gradient(180deg, #40648d, #193656); }
.charcoal { background: linear-gradient(180deg, #4a4d53, #1e2126); }
.weathered { background: linear-gradient(180deg, #8b8f8d, #636866); }
.desert { background: linear-gradient(180deg, #c89e74, #8f6d4d); }
.terracotta { background: linear-gradient(180deg, #d0704b, #964225); }
.sunset { background: linear-gradient(180deg, #d58b65, #a95538); }
.sienna { background: linear-gradient(180deg, #9f6747, #6f4229); }
.sandstone { background: linear-gradient(180deg, #d5c0a1, #b39d7f); }
.oyster { background: linear-gradient(180deg, #d5d5d1, #ababab); }
.mocha { background: linear-gradient(180deg, #8e6d59, #5e4639); }
.weathered-terra { background: linear-gradient(180deg, #c48c71, #8b5d46); }
.bone { background: linear-gradient(180deg, #f0ede8, #ddd7cc); }
.sand-dollar { background: linear-gradient(180deg, #d8ccb8, #baa88d); }
.galvalume { background: linear-gradient(180deg, #bfc4cb, #858f9c); }
.dove { background: linear-gradient(180deg, #cfd3d8, #a1a8b3); }
.bronze { background: linear-gradient(180deg, #735442, #3f2c23); }
.aged-copper { background: linear-gradient(180deg, #b76f4e, #6f3c28); }
.almond { background: linear-gradient(180deg, #e7dcc7, #c6b79f); }
.bayside-black { background: linear-gradient(180deg, #2f3540, #0d1016); }
.buckskin { background: linear-gradient(180deg, #c9aa79, #8e7048); }
.burgundy { background: linear-gradient(180deg, #8e3240, #53161f); }
.celestial-bronze { background: linear-gradient(180deg, #8a6b53, #544033); }
.champagne-metallic { background: linear-gradient(180deg, #dbcfbf, #b9aa99); }
.charcoal-gray { background: linear-gradient(180deg, #63686d, #2e3237); }
.colonial-red { background: linear-gradient(180deg, #aa3b37, #6a1f1d); }
.copper-metallic { background: linear-gradient(180deg, #c47d56, #8f5237); }
.cosmic-dusk { background: linear-gradient(180deg, #5a6178, #2f3549); }
.dark-bronze { background: linear-gradient(180deg, #5c463b, #2f241d); }
.dove-gray { background: linear-gradient(180deg, #d3d6d8, #a4aab0); }
.eclipse { background: linear-gradient(180deg, #27292d, #050607); }
.evergreen { background: linear-gradient(180deg, #3d5947, #203328); }
.hartford-green { background: linear-gradient(180deg, #41604c, #24392d); }
.hemlock-green { background: linear-gradient(180deg, #5f715f, #344035); }
.mansard-brown { background: linear-gradient(180deg, #73513e, #422d22); }
.matte-black { background: linear-gradient(180deg, #1c1d1f, #060607); }
.medium-bronze { background: linear-gradient(180deg, #87684d, #5d4431); }
.millennium-blue { background: linear-gradient(180deg, #4f7197, #28435f); }
.patina-green { background: linear-gradient(180deg, #6a8e84, #3d5d55); }
.pre-weathered { background: linear-gradient(180deg, #8e8f8c, #666764); }
.regal-blue { background: linear-gradient(180deg, #25598f, #12314e); }
.regal-red { background: linear-gradient(180deg, #9f2c2b, #5b1113); }
.regal-white { background: linear-gradient(180deg, #fbfaf7, #ddd9d3); }
.sandstone-metal { background: linear-gradient(180deg, #d0c0a6, #ab997d); }
.sierra-tan { background: linear-gradient(180deg, #c7b08a, #987d58); }
.silver-metallic { background: linear-gradient(180deg, #d2d4d8, #969ca3); }
.slate-blue { background: linear-gradient(180deg, #607795, #334964); }
.slate-gray { background: linear-gradient(180deg, #7b7f86, #4b5057); }
.solar-white { background: linear-gradient(180deg, #ffffff, #e4e8ec); }
.terra-cotta-metal { background: linear-gradient(180deg, #c16f4b, #8a4428); }
.tropical-patina { background: linear-gradient(180deg, #5f8f84, #2f5d55); }
.vintage-copper { background: linear-gradient(180deg, #8d745f, #5c493d); }
.vintage-galvalume { background: linear-gradient(180deg, #959da2, #687176); }
.vintage-steel { background: linear-gradient(180deg, #7f868c, #53585d); }

.info-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px 20px;
    max-width: 760px;
    margin: 0 auto;
}

.info-grid label {
    display: grid;
    gap: 8px;
    font-weight: 600;
}

.info-grid input {
    width: 100%;
    padding: 15px 16px;
    border: 1px solid var(--line-strong);
    border-radius: 10px;
    background: #fff;
}

.status-screen {
    padding-top: 24px;
}

.status-card {
    text-align: center;
    padding: 12px 18px 30px;
}

.status-pill {
    display: inline-flex;
    border-radius: 999px;
    padding: 8px 14px;
    background: rgba(217, 130, 43, 0.14);
    color: #9b5a13;
    font-weight: 700;
    text-transform: capitalize;
}

.status-pill.completed {
    background: rgba(31, 133, 74, 0.14);
    color: #176036;
}

.status-pill.failed {
    background: rgba(179, 51, 51, 0.14);
    color: #8d1f1f;
}

.status-card h2 {
    margin: 16px 0 12px;
    font-size: clamp(1.9rem, 4vw, 2.8rem);
}

.status-meta,
.status-generated,
.result-list p,
.note-strip {
    color: var(--muted);
}

.status-generated {
    max-width: 720px;
    margin: 18px auto 0;
    line-height: 1.6;
}

.result-panel {
    max-width: 720px;
    margin: 8px auto 0;
}

.result-panel h3 {
    text-align: center;
    font-size: 1.5rem;
}

.result-list {
    display: grid;
    gap: 14px;
}

.result-item {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 16px;
    padding: 18px;
    border-radius: var(--radius-md);
    border: 1px solid var(--line);
    background: #fff;
    box-shadow: var(--shadow);
}

.result-preview {
    width: 100%;
    max-height: 460px;
    object-fit: cover;
    border-radius: 14px;
    grid-column: 1 / -1;
    border: 1px solid var(--line);
}

.result-copy {
    min-width: 0;
}

.note-strip {
    max-width: 720px;
    margin: 18px auto 0;
    padding: 16px 18px;
    border-radius: 14px;
    background: #fff8f1;
    border: 1px solid #f1d1b1;
}

@keyframes fadeUp {
    from {
        opacity: 0;
        transform: translateY(8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@media (max-width: 900px) {
    .option-grid-materials,
    .option-grid-profiles,
    .option-grid-colors,
    .info-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 640px) {
    .app-topbar,
    .preview-overlay,
    .result-item {
        display: flex;
        flex-direction: column;
        align-items: flex-start;
    }

    .progress-wrap {
        margin-top: 24px;
    }

    .option-grid-materials,
    .option-grid-profiles,
    .option-grid-colors,
    .info-grid {
        grid-template-columns: 1fr;
    }

    .upload-stage,
    .upload-empty,
    .upload-preview,
    .upload-preview img {
        min-height: 360px;
        height: 360px;
    }

    .primary-button {
        width: 100%;
        min-width: 0;
    }
}