/* ==========================================================================
   Home Design B2B Page Styles
   Style: Milan-cool UI, Editorial, Hairlines, Curatorial
   ========================================================================== */

/* --- Variables (Local Scope) --- */
:root {
    --hd-black: #1a1a1a;
    --hd-white: #ffffff;
    --hd-gray-100: #f5f5f5;
    --hd-gray-200: #e5e5e5;
    --hd-gray-400: #a3a3a3;
    --hd-gray-600: #737373;
    --hd-accent: #c6a87c;
    /* Muted Gold/Bronze */

    --hd-font-sans: 'Inter', sans-serif;
    --hd-font-serif: 'Noto Serif TC', serif;

    --hd-transition: 0.6s cubic-bezier(0.22, 1, 0.36, 1);
    --hd-hairline: 1px solid rgba(0, 0, 0, 0.08);
}

/* --- Base & Utilities --- */
.homedesign-page {
    background-color: var(--hd-white);
    color: var(--hd-black);
    font-family: var(--hd-font-sans);
    overflow-x: hidden;
}

.hd-section-title {
    font-family: var(--hd-font-serif);
    font-size: 2.5rem;
    line-height: 1.2;
    margin-bottom: 1.5rem;
    font-weight: 500;
}

.hd-section-subtitle {
    font-size: 1.125rem;
    color: var(--hd-gray-600);
    margin-bottom: 2rem;
    max-width: 600px;
}

.hd-text-link {
    display: inline-flex;
    align-items: center;
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--hd-black);
    text-decoration: none;
    border-bottom: 1px solid currentColor;
    padding-bottom: 2px;
    transition: var(--hd-transition);
}

.hd-text-link:hover {
    color: var(--hd-gray-600);
}

.hd-section-deco {
    font-size: 0.75rem;
    letter-spacing: 0.1em;
    color: var(--hd-gray-400);
    margin-bottom: 2rem;
    display: block;
    font-weight: 500;
    padding-left: 1.5rem;
    /* Container padding adjustment */
}

@media (min-width: 1360px) {
    .hd-section-deco {
        padding-left: calc((100vw - 1320px) / 2);
    }
}

.section {
    padding: 6rem 0;
}

/* Scroll Reveal State */
.scroll-reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

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

/* --- Breadcrumb --- */
.hd-breadcrumb {
    padding: 1.5rem 0;
    font-size: 0.75rem;
    letter-spacing: 0.05em;
    color: var(--hd-gray-600);
    display: flex;
    align-items: center;
    position: relative;
}

.hd-breadcrumb .divider {
    margin: 0 0.5rem;
    color: var(--hd-gray-400);
}

.hd-breadcrumb__micro {
    margin-left: auto;
    font-size: 0.625rem;
    border: 1px solid var(--hd-gray-200);
    padding: 2px 6px;
    border-radius: 2px;
    letter-spacing: 0.1em;
    display: none;
}

@media (min-width: 768px) {
    .hd-breadcrumb__micro {
        display: inline-block;
    }
}

/* --- 01. Hero --- */
.hd-hero {
    position: relative;
    height: 85vh;
    min-height: 600px;
    display: flex;
    align-items: center;
    overflow: hidden;
}

.hd-hero__media {
    position: absolute;
    inset: 0;
    z-index: 0;
}

.hd-hero__img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.hd-hero__overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(90deg, rgba(255, 255, 255, 0.95) 0%, rgba(255, 255, 255, 0.7) 40%, rgba(255, 255, 255, 0) 100%);
}

.hd-hero__content {
    position: relative;
    z-index: 1;
    width: 100%;
}

.hd-hero__text {
    max-width: 600px;
    position: relative;
    padding-left: 2rem;
    border-left: 1px solid var(--hd-black);
}

.hd-micro-label {
    font-size: 0.75rem;
    letter-spacing: 0.2em;
    font-weight: 600;
    margin-bottom: 1.5rem;
    display: block;
}

.hd-hero__title {
    font-family: var(--hd-font-serif);
    font-size: 3.5rem;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    color: var(--hd-black);
}

.hd-hero__desc {
    font-size: 1.125rem;
    line-height: 1.6;
    color: var(--hd-gray-600);
    margin-bottom: 2.5rem;
}

.hd-hero__actions {
    display: flex;
    gap: 1rem;
}

.hd-hero__deco {
    position: absolute;
    bottom: 2rem;
    right: 2rem;
    font-size: 0.75rem;
    letter-spacing: 0.2em;
    writing-mode: vertical-rl;
    color: var(--hd-gray-400);
}

@media (max-width: 768px) {
    .hd-hero {
        height: auto;
        padding: 4rem 0;
    }

    .hd-hero__overlay {
        background: rgba(255, 255, 255, 0.9);
    }

    .hd-hero__title {
        font-size: 2.25rem;
    }

    .hd-hero__text {
        padding-left: 1rem;
        border-left-width: 2px;
    }

    .hd-hero__actions {
        flex-direction: column;
    }

    .hd-hero__deco {
        display: none;
    }
}

/* --- Sticky Nav --- */
.hd-sticky-nav {
    position: sticky;
    top: 80px;
    /* Adjust based on site header height */
    z-index: 90;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: var(--hd-hairline);
    transition: top 0.3s;
}

.hd-sticky-nav__inner {
    display: flex;
    gap: 2rem;
    overflow-x: auto;
    scrollbar-width: none;
    padding: 1rem 0;
}

.hd-sticky-nav__inner::-webkit-scrollbar {
    display: none;
}

.hd-nav-item {
    font-size: 0.8125rem;
    color: var(--hd-gray-400);
    text-decoration: none;
    white-space: nowrap;
    transition: color 0.3s;
    position: relative;
}

.hd-nav-item.active {
    color: var(--hd-black);
    font-weight: 600;
}

.hd-nav-item.active::after {
    content: '';
    position: absolute;
    bottom: -17px;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--hd-black);
}

/* --- 02. Proof Bar --- */
.hd-proof {
    padding: 4rem 0;
    border-bottom: var(--hd-hairline);
}

.hd-proof__header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: 2rem;
}

.hd-proof__title {
    font-size: 1rem;
    font-weight: 600;
}

.hd-micro-line {
    font-size: 0.8125rem;
    color: var(--hd-gray-600);
}

.hd-proof__chips {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
}

.hd-chip {
    padding: 0.5rem 1rem;
    border: 1px solid var(--hd-gray-200);
    border-radius: 100px;
    font-size: 0.875rem;
    color: var(--hd-gray-600);
}

@media (max-width: 768px) {
    .hd-proof__header {
        flex-direction: column;
        gap: 0.5rem;
    }
}

/* --- 03. Scope Modules --- */
.hd-scope__grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: start;
}

.hd-scope__content {
    position: relative;
    z-index: 2;
}

.hd-accordion {
    border-top: var(--hd-hairline);
    margin-bottom: 2rem;
}

.hd-accordion__item {
    border-bottom: var(--hd-hairline);
}

.hd-accordion__trigger {
    width: 100%;
    text-align: left;
    padding: 1.5rem 0;
    background: none;
    border: none;
    display: flex;
    align-items: center;
    cursor: pointer;
    transition: color 0.3s;
}

.hd-accordion__trigger:hover {
    color: var(--hd-gray-600);
}

.hd-accordion__num {
    font-family: var(--hd-font-serif);
    font-size: 0.875rem;
    color: var(--hd-gray-400);
    width: 3rem;
}

.hd-accordion__label {
    flex: 1;
    font-size: 1.125rem;
    font-weight: 500;
}

.hd-accordion__icon {
    font-size: 1.25rem;
    color: var(--hd-gray-400);
    transition: transform 0.3s;
}

.hd-accordion__trigger[aria-expanded="true"] .hd-accordion__icon {
    transform: rotate(45deg);
    color: var(--hd-black);
}

.hd-accordion__panel {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.5s ease-out;
}

.hd-accordion__panel p {
    padding: 0 0 1.5rem 3rem;
    color: var(--hd-gray-600);
    line-height: 1.6;
    margin: 0;
}

.hd-scope__visual {
    position: sticky;
    top: 150px;
}

.hd-scope__img-wrapper {
    position: relative;
    padding-bottom: 125%;
    /* Portrait Aspect Ratio */
    overflow: hidden;
    background: var(--hd-gray-100);
}

.hd-scope__img-wrapper img {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: opacity 0.5s ease-in-out;
}

@media (max-width: 900px) {
    .hd-scope__grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .hd-scope__visual {
        display: none;
    }

    /* Hide sticky image on mobile for simplicity */
}

/* --- 04. Standard --- */
.hd-standard {
    background: var(--hd-gray-100);
}

.hd-standard__header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 3rem;
}

.hd-stamp {
    border: 1px solid var(--hd-black);
    padding: 0.5rem 1rem;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    transform: rotate(-2deg);
}

.hd-standard__grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1px;
    background: var(--hd-gray-200);
    /* For border effect */
    border: 1px solid var(--hd-gray-200);
}

.hd-std-card {
    background: var(--hd-white);
    padding: 3rem;
    position: relative;
}

.hd-std-card__label {
    font-size: 0.625rem;
    letter-spacing: 0.2em;
    color: var(--hd-gray-400);
    display: block;
    margin-bottom: 1rem;
}

.hd-std-card__title {
    font-size: 1.5rem;
    font-family: var(--hd-font-serif);
    margin-bottom: 1.5rem;
}

.hd-std-card__list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.hd-std-card__list li {
    position: relative;
    padding-left: 1rem;
    margin-bottom: 0.5rem;
    font-size: 0.9375rem;
    color: var(--hd-gray-600);
}

.hd-std-card__list li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--hd-gray-400);
}

@media (max-width: 768px) {
    .hd-standard__grid {
        grid-template-columns: 1fr;
    }

    .hd-std-card {
        padding: 2rem;
    }

    .hd-standard__header {
        flex-direction: column;
        gap: 1rem;
    }
}

/* --- 05. Process --- */
.hd-process__timeline {
    display: flex;
    justify-content: space-between;
    margin-top: 4rem;
    position: relative;
}

.hd-process__timeline::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    border-top: var(--hd-hairline);
    z-index: 0;
}

.hd-process__step {
    position: relative;
    z-index: 1;
    padding-top: 2rem;
    width: 18%;
}

.hd-process__step::before {
    content: '';
    position: absolute;
    top: -3px;
    left: 0;
    width: 6px;
    height: 6px;
    background: var(--hd-black);
    border-radius: 50%;
}

.hd-process__num {
    display: block;
    font-size: 0.75rem;
    color: var(--hd-gray-400);
    margin-bottom: 0.5rem;
    font-family: var(--hd-font-serif);
}

.hd-process__title {
    font-size: 1.125rem;
    margin-bottom: 0.75rem;
}

.hd-process__desc {
    font-size: 0.875rem;
    color: var(--hd-gray-600);
    line-height: 1.5;
}

@media (max-width: 768px) {
    .hd-process__timeline {
        flex-direction: column;
        padding-left: 1rem;
        border-left: var(--hd-hairline);
        border-top: none;
    }

    .hd-process__timeline::before {
        display: none;
    }

    .hd-process__step {
        width: 100%;
        padding-top: 0;
        padding-left: 2rem;
        margin-bottom: 2rem;
    }

    .hd-process__step::before {
        top: 6px;
        left: -3px;
    }
}

/* --- 06. Cases --- */
.hd-cases__header {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    margin-bottom: 3rem;
}

.hd-cases__filter {
    display: flex;
    gap: 1.5rem;
}

.hd-filter-btn {
    background: none;
    border: none;
    font-size: 0.875rem;
    color: var(--hd-gray-400);
    cursor: pointer;
    padding: 0;
    transition: color 0.3s;
}

.hd-filter-btn.active,
.hd-filter-btn:hover {
    color: var(--hd-black);
}

.hd-cases__gallery {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    grid-template-rows: auto auto;
    gap: 1.5rem;
}

/* Featured item takes first 2 columns and 2 rows */
.hd-case-card--lg {
    grid-column: 1 / 3;
    grid-row: 1 / 3;
}

.hd-case-card {
    display: block;
    text-decoration: none;
    cursor: pointer;
    transition: opacity 0.4s ease;
}

.hd-case-card.hidden {
    display: none;
}

.hd-case-card__img {
    position: relative;
    overflow: hidden;
    margin-bottom: 1rem;
    aspect-ratio: 4/3;
    background: var(--hd-gray-100);
}

.hd-case-card--lg .hd-case-card__img {
    aspect-ratio: 3/4;
    /* Portrait for featured */
}

.hd-case-card__img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.6s ease;
}

.hd-case-card:hover .hd-case-card__img img {
    transform: scale(1.03);
}

.hd-case-card__labels {
    position: absolute;
    bottom: 1rem;
    left: 1rem;
    display: flex;
    gap: 0.5rem;
}

.hd-case-card__labels span {
    background: rgba(255, 255, 255, 0.9);
    padding: 2px 6px;
    font-size: 0.625rem;
    border-radius: 2px;
}

.hd-case-card__info h3 {
    font-size: 1rem;
    font-weight: 500;
    margin-bottom: 0.25rem;
}

.hd-cases__cta {
    margin-top: 3rem;
    text-align: center;
}

@media (max-width: 900px) {
    .hd-cases__header {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }

    .hd-cases__gallery {
        grid-template-columns: 1fr 1fr;
    }

    .hd-case-card--lg {
        grid-column: 1 / 3;
        aspect-ratio: auto;
    }
}

@media (max-width: 600px) {
    .hd-cases__gallery {
        grid-template-columns: 1fr;
    }

    .hd-case-card--lg {
        grid-column: 1;
    }
}

/* --- 07. Library --- */
.hd-library__wrapper {
    display: flex;
    flex-direction: column;
    border: var(--hd-hairline);
}

.hd-library__tabs {
    display: flex;
    border-bottom: var(--hd-hairline);
}

.hd-lib-tab {
    flex: 1;
    padding: 1.5rem;
    background: none;
    border: none;
    border-right: var(--hd-hairline);
    cursor: pointer;
    font-size: 0.9375rem;
    transition: background 0.3s;
}

.hd-lib-tab:last-child {
    border-right: none;
}

.hd-lib-tab.active {
    background: var(--hd-gray-100);
    font-weight: 600;
}

.hd-library__content {
    padding: 3rem;
    min-height: 250px;
    position: relative;
    background: var(--hd-gray-100);
}

.hd-lib-panel {
    display: none;
    opacity: 0;
    transition: opacity 0.3s;
}

.hd-lib-panel.active {
    display: block;
    opacity: 1;
}

.hd-lib-list {
    margin: 0;
    padding-left: 1.25rem;
}

.hd-lib-list li {
    margin-bottom: 0.75rem;
    color: var(--hd-gray-600);
}

.hd-lib-deco {
    position: absolute;
    bottom: 2rem;
    right: 2rem;
    font-size: 3rem;
    color: rgba(0, 0, 0, 0.03);
    font-weight: 700;
    letter-spacing: -0.02em;
    pointer-events: none;
}

.hd-library__action {
    padding: 2rem;
    border-top: var(--hd-hairline);
    text-align: center;
}

@media (max-width: 768px) {
    .hd-library__tabs {
        overflow-x: auto;
    }

    .hd-lib-tab {
        min-width: 100px;
    }

    .hd-library__content {
        padding: 2rem;
    }
}

/* --- 08. Mode --- */
.hd-mode__grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.hd-mode-card {
    padding: 2.5rem;
    border: var(--hd-hairline);
    height: 100%;
}

.hd-mode-card h3 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
}

.hd-mode-card p {
    font-size: 0.9375rem;
    color: var(--hd-gray-600);
    margin-bottom: 2rem;
    line-height: 1.5;
}

.hd-mode-card--dark {
    background: var(--hd-black);
    color: var(--hd-white);
}

.hd-mode-card--dark p {
    color: var(--hd-gray-400);
}

.hd-mode-card--dark .hd-text-link {
    color: var(--hd-white);
}

.hd-mode-card--dark .hd-text-link:hover {
    color: var(--hd-gray-400);
}

@media (max-width: 900px) {
    .hd-mode__grid {
        grid-template-columns: 1fr;
    }
}

/* --- 09. FAQ --- */
.hd-accordion--faq {
    border-top: none;
}

.hd-accordion--faq .hd-accordion__item {
    border-top: var(--hd-hairline);
    border-bottom: none;
}

/* --- 10. Form --- */
.hd-form {
    padding-bottom: 8rem;
}

.hd-form__card {
    background: var(--hd-white);
    border: var(--hd-hairline);
    padding: 4rem;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.03);
}

.hd-form__tabs {
    display: flex;
    gap: 2rem;
    margin-bottom: 3rem;
    border-bottom: var(--hd-hairline);
}

.hd-form-tab {
    background: none;
    border: none;
    padding: 0 0 1rem 0;
    font-size: 1.125rem;
    color: var(--hd-gray-400);
    cursor: pointer;
    position: relative;
    transition: color 0.3s;
}

.hd-form-tab.active {
    color: var(--hd-black);
    font-weight: 500;
}

.hd-form-tab.active::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--hd-black);
}

.hd-form-group {
    margin-bottom: 1.5rem;
}

.hd-form-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.hd-form-group input[type="text"],
.hd-form-group input[type="tel"],
.hd-form-group select,
.hd-form-group textarea {
    width: 100%;
    padding: 0.75rem 0;
    border: none;
    border-bottom: 1px solid var(--hd-gray-200);
    font-family: inherit;
    font-size: 1rem;
    background: transparent;
    transition: border-color 0.3s;
}

.hd-form-group input:focus,
.hd-form-group select:focus,
.hd-form-group textarea:focus {
    outline: none;
    border-color: var(--hd-black);
}

.hd-checkbox-group {
    display: flex;
    gap: 1.5rem;
    padding-top: 0.5rem;
}

.hd-checkbox-group label {
    font-weight: 400;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
}

@media (max-width: 600px) {
    .hd-form__card {
        padding: 2rem;
    }

    .hd-form__tabs {
        gap: 1rem;
    }

    .hd-form-tab {
        font-size: 1rem;
    }
}

/* Animations/Utils */
.d-none {
    display: none !important;
}