/* ============================================================
   CETU 官网 — 首页样式 (index)
   作用范围：Hero、关于、项目、部门、服务、CTA 等首页独占区块
   对应模板：main/templates/main/index.html
   ============================================================ */

/* ============================================================
   HERO SECTION
   ============================================================ */
.hero {
    position: relative;
    width: 100%;
    height: 100vh;
    height: 100svh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    background-color: var(--white);
    background-image:
        linear-gradient(var(--black-05) 1px, transparent 1px),
        linear-gradient(90deg, var(--black-05) 1px, transparent 1px);
    background-size: 50px 50px, 50px 50px;
}

#fx-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
    pointer-events: none;
    display: block;
}

.hero__content {
    position: relative;
    z-index: 2;
    text-align: center;
    max-width: 900px;
    padding: 0 var(--space-lg);
}

.hero__title {
    font-size: var(--font-display);
    font-weight: 700;
    line-height: 1.05;
    letter-spacing: -0.03em;
    margin-bottom: 0.25rem;
    color: var(--dark-800);
}

.hero__title .char {
    display: inline-block;
    background: linear-gradient(135deg, var(--dark-800) 0%, var(--dark-800) 40%, var(--orange) 60%, var(--gold) 80%, var(--dark-800) 100%);
    background-size: 300% 300%;
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero__subtitle .char {
    display: inline-block;
}

.hero__desc {
    max-width: 520px;
    margin: 0 auto var(--space-lg);
    font-size: var(--font-body);
    line-height: 1.7;
    color: var(--gray);
    font-weight: 400;
}

.hero__actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* Hero 入场动画（由 base.html 中的 JS 逐字/逐块添加 animation_* 类） */
.hero__title .char.animation_char_reveal {
    animation: animation_char_reveal 0.8s ease-out both, gradient-to-gold 1.5s ease-out 0.6s forwards;
}

.hero__subtitle .char.animation_char_reveal {
    animation: animation_char_reveal_sub 0.8s ease-out both;
}

.hero__desc,
.hero__actions {
    opacity: 0;
}

.hero__desc.animation_fade_up,
.hero__actions.animation_fade_up {
    animation: animation_fade_up 0.9s ease-out forwards;
}

@keyframes gradient-to-gold {
    0% { background-position: 0% 50%; }
    100% { background-position: 100% 50%; }
}

@keyframes animation_char_reveal {
    0% { opacity: 0; transform: translateY(40px); filter: blur(2px); }
    100% { opacity: 1; transform: translateY(0); filter: blur(0); }
}

@keyframes animation_char_reveal_sub {
    0% { opacity: 0; transform: translateY(20px); filter: blur(2px); }
    100% { opacity: 1; transform: translateY(0); filter: blur(0); }
}

@keyframes animation_fade_up {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes scale-in {
    from { opacity: 0; transform: translateY(80px) scale(0.95); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

/* ============================================================
   SCROLL INDICATOR
   ============================================================ */
.scroll-indicator {
    position: absolute;
    bottom: 2.5rem;
    left: 50%;
    transform: translateX(-50%);
    z-index: 2;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-muted);
    font-size: var(--font-emphasis-sm);
    font-weight: 500;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    overflow: hidden;
    transition: opacity 0.5s ease, transform 0.5s ease;
}

/* ============================================================
   ABOUT SECTION
   ============================================================ */
.about__grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 5rem;
    align-items: center;
}

.about__visual {
    position: relative;
    aspect-ratio: 4 / 3;
    border-radius: var(--radius-md);
    overflow: hidden;
    background: var(--warm-light);
}

/* 头像墙 */
.about__avatar-track {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    width: 100%;
    will-change: transform;
    animation: avatar-scroll-up 60s linear infinite;
}

.about__avatar-img {
    display: block;
    width: 100%;
    aspect-ratio: 1 / 1;
    object-fit: cover;
}

@keyframes avatar-scroll-up {
    from { transform: translateY(0); }
    to { transform: translateY(-50%); }
}

.about__text-wrap {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.about__stat-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    margin-top: var(--space-sm);
    padding-top: var(--space-lg);
    border-top: 1px solid var(--bronze-12);
}

.about__stat-number {
    font-size: var(--font-title-sm);
    font-weight: 700;
    color: var(--dark-800);
    line-height: 1;
    margin-bottom: 0.25rem;
}

.about__stat-label {
    font-size: var(--font-emphasis);
    color: var(--text-muted);
    font-weight: 500;
}

/* ============================================================
   FEATURES / PROJECT CARDS
   ============================================================ */
.features {
    background: var(--light-bg);
}

.features__grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
}

.project-card {
    background: var(--white);
    border-radius: var(--radius-md);
    padding: var(--space-lg);
    border: 1px solid var(--black-06);
    transition: transform 0.15s ease-out, box-shadow 0.3s ease;
}

.project-card__header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: var(--space-sm);
}

.project-card__name {
    font-size: var(--font-body);
    font-weight: 600;
    color: var(--dark-800);
}

.project-card__privacy {
    font-size: var(--font-emphasis-sm);
    font-weight: 500;
    padding: 0.2rem 0.6rem;
    border-radius: var(--radius-full);
    background: var(--light-bg);
    color: var(--text-muted);
    flex-shrink: 0;
}

.project-card__privacy.done {
    background: var(--green-10);
    color: var(--green);
    border: 1px solid var(--green-20);
}

.project-card__privacy.in-progress {
    background: var(--cyan-10);
    color: var(--cyan);
    border: 1px solid var(--cyan-20);
}

.project-card__desc {
    font-size: var(--font-body-sm);
    line-height: 1.7;
    color: var(--gray);
    margin-bottom: var(--space-sm);
}

.project-card__meta {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: var(--space-sm);
}

.project-card__year {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    font-size: var(--font-emphasis);
    color: var(--text-muted);
    font-weight: 500;
}

.project-card__tags {
    display: flex;
    gap: 0.4rem;
    flex-wrap: wrap;
}

.project-card__tag {
    font-size: var(--font-emphasis-sm);
    font-weight: 600;
    padding: 0.2rem 0.6rem;
    border-radius: var(--radius-full);
}

.project-card:nth-child(5n+1) .project-card__tag { background: var(--gold); color: var(--dark-800); }
.project-card:nth-child(5n+2) .project-card__tag { background: var(--orange); color: var(--white); }
.project-card:nth-child(5n+3) .project-card__tag { background: var(--warm-light); color: var(--dark-800); }
.project-card:nth-child(5n+4) .project-card__tag { background: var(--cyan); color: var(--white); }
.project-card:nth-child(5n+5) .project-card__tag { background: var(--dark-800); color: var(--white); }

/* ============================================================
   HOVER-3D CARDS
   ============================================================ */
.hover-3d-card {
    perspective: 800px;
    opacity: 0;
}

.hover-3d-card.animation_revealed {
    animation: animation_fade_up 0.9s var(--ease-out) forwards;
}

.features__grid .hover-3d-card:nth-child(1).animation_revealed { animation-delay: 0s; }
.features__grid .hover-3d-card:nth-child(2).animation_revealed { animation-delay: 0.1s; }
.features__grid .hover-3d-card:nth-child(3).animation_revealed { animation-delay: 0.2s; }
.features__grid .hover-3d-card:nth-child(4).animation_revealed { animation-delay: 0.3s; }
.features__grid .hover-3d-card:nth-child(5).animation_revealed { animation-delay: 0.4s; }
.features__grid .hover-3d-card:nth-child(6).animation_revealed { animation-delay: 0.5s; }
.features__grid .hover-3d-card:nth-child(7).animation_revealed { animation-delay: 0.6s; }
.features__grid .hover-3d-card:nth-child(8).animation_revealed { animation-delay: 0.7s; }
.features__grid .hover-3d-card:nth-child(9).animation_revealed { animation-delay: 0.8s; }
.features__grid .hover-3d-card:nth-child(10).animation_revealed { animation-delay: 0.9s; }

/* ============================================================
   DEPT CAROUSEL
   ============================================================ */
.dept-tabs {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    margin: var(--space-lg) 0 var(--space-md);
    flex-wrap: wrap;
}

.dept-tab {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.45rem 1rem;
    font-size: var(--font-emphasis);
    font-weight: 500;
    border-radius: var(--radius-full);
    cursor: pointer;
    background: var(--light-bg);
    color: var(--text-muted);
    transition: all 0.3s ease;
}

.dept-tab svg {
    width: 14px;
    height: 14px;
    opacity: 0.5;
}

.animation_tab_active {
    background: var(--dark-800) !important;
    color: var(--white) !important;
}

.animation_tab_active svg {
    opacity: 1;
    color: var(--gold);
}

.dept-stage {
    position: relative;
    min-height: 360px;
    overflow: hidden;
}

.dept-panel {
    position: absolute;
    inset: 0;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
    transform: translateY(100%);
    transition: transform 0.5s var(--ease-out);
}

.dept-panel.active {
    transform: translateY(0);
}

.dept-panel .section__title {
    font-size: var(--font-title-sm);
}

.dept-panel .section__desc {
    max-width: 100%;
}

.dept-panel__text {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.dept-panel__img {
    border-radius: var(--radius-md);
    background-size: cover;
    background-position: center;
    background-color: var(--light-bg);
    background-repeat: no-repeat;
    font-size: var(--font-subtitle);
    font-weight: bold;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    min-height: 320px;
}

.dept-panel__tags {
    display: flex;
    gap: 0.4rem;
    flex-wrap: wrap;
}

.dept-panel__tags span {
    font-size: var(--font-emphasis-sm);
    font-weight: 500;
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-full);
    background: var(--light-bg);
    color: var(--dark-800);
}

/* ============================================================
   SERVICES SECTION
   ============================================================ */
.services {
    background: var(--light-bg);
}

.services__grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    margin-top: var(--space-lg);
}

.services__card {
    background: var(--white);
    border-radius: var(--radius-md);
    padding: var(--space-lg);
    border: 1px solid var(--black-06);
    position: relative;
    overflow: hidden;
    cursor: pointer;
}

.services__card--software {
    background:
        linear-gradient(135deg, transparent 49%, var(--dark-800-06) 49%, var(--dark-800-06) 51%, transparent 51%),
        linear-gradient(225deg, transparent 49%, var(--dark-800-04) 49%, var(--dark-800-04) 51%, transparent 51%),
        linear-gradient(to bottom, var(--gold-08), transparent 30%, transparent 70%, var(--dark-800-06));
    background-size: 80px 80px, 60px 60px, 100% 100%;
    background-position: 0 0, 20px 30px, 0 0;
}

.services__card--hardware {
    border: 2px solid var(--white);
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
}

.services__card--hardware .services__card-title,
.services__card--hardware .services__card-desc,
.services__card--hardware .services__card-list li {
    color: var(--white);
    text-shadow: 3px 3px 2px var(--black);
}

.services__card-title {
    font-size: var(--font-body);
    font-weight: 600;
    color: var(--dark-800);
    margin-bottom: var(--space-sm);
}

.services__card-desc {
    font-size: var(--font-body-sm);
    line-height: 1.7;
    color: var(--gray);
    margin-bottom: var(--space-sm);
}

.services__card-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-bottom: var(--space-md);
}

.services__card-list li {
    font-size: var(--font-emphasis);
    color: var(--text-muted);
    padding-left: var(--space-sm);
    position: relative;
}

.services__card-list li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--gold);
    font-weight: 700;
}

/* 服务卡片 hover 遮罩提示（居中显示「点击了解更多」） */
.services__grid a.hover-3d {
    text-decoration: none;
    color: inherit;
}

.services__card-hint {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: var(--space-md);
    background: rgba(26, 18, 11, 0.55);
    color: var(--white);
    font-size: var(--font-body);
    font-weight: 600;
    letter-spacing: 0.02em;
    text-align: center;
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.35s ease;
}

.services__card-hint svg {
    width: 10px;
    height: 8px;
    flex-shrink: 0;
}

.hover-3d:hover .services__card-hint {
    opacity: 1;
}

/* ============================================================
   CTA SECTION
   ============================================================ */
.cta {
    text-align: center;
}

.cta__title {
    font-size: var(--font-title);
    font-weight: 700;
    color: var(--dark-800);
    line-height: 1.2;
    margin-bottom: var(--space-sm);
}

.cta__desc {
    font-size: var(--font-body);
    color: var(--gray);
    max-width: 520px;
    margin: 0 auto var(--space-lg);
}

.cta__wrap {
    background: linear-gradient(135deg, var(--white) 0%, var(--warm-light) 50%, var(--white) 100%);
    background-size: 200% 200%;
    border-radius: var(--radius-lg);
    padding: var(--section-pad-y-sm) var(--space-lg);
    position: relative;
    overflow: hidden;
    opacity: 0;
    transform: translateY(80px) scale(0.95);
}

.cta__wrap::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: var(--radius-lg);
    border: 1px solid var(--bronze-10);
    pointer-events: none;
}

.cta__wrap.animation_revealed {
    animation: scale-in 1.2s var(--ease-out) forwards;
}

/* ============================================================
   RESPONSIVE (index)
   ============================================================ */
@media (max-width: 1024px) {
    .about__grid {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
}

@media (max-width: 768px) {
    .hero__content {
        padding: 0 var(--space-md);
    }

    .about__stat-row {
        grid-template-columns: repeat(3, 1fr);
        gap: 1rem;
    }

    .dept-stage {
        min-height: auto;
        padding: var(--space-md);
    }

    .dept-panel {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .dept-panel.active {
        position: relative;
    }

    .dept-panel__img {
        min-height: 200px;
    }

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

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

    .cta__wrap {
        padding: var(--space-lg) var(--space-md);
    }
}

@media (max-width: 480px) {
    .about__stat-row {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
}