/* ============================================================
   home.css - GuitarMasta 2.0 首页专属样式
   路径：/css/home.css
   包含：Hero区、筒仓入口、精选内容区、Why Trust Us区、
         首屏价值可见、移动端响应式
   ============================================================ */

/* ============ 1. Hero 区域 ============ */
.hero {
    background: linear-gradient(135deg, var(--c-secondary-dark) 0%, var(--c-secondary) 40%, var(--c-secondary-light) 100%);
    color: #fff;
    padding: var(--sp-8) var(--sp-5) var(--sp-7);
    position: relative;
    overflow: hidden;
    isolation: isolate;
}

/* Hero 背景装饰：微妙的光点与纹理 */
.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background-image:
        radial-gradient(circle at 30% 40%, rgba(255, 255, 255, 0.06) 1px, transparent 1px),
        radial-gradient(circle at 70% 60%, rgba(255, 255, 255, 0.04) 1px, transparent 1px),
        radial-gradient(circle at 50% 80%, rgba(194, 94, 58, 0.15) 80px, transparent 80px);
    background-size: 60px 60px, 80px 80px, 100% 100%;
    z-index: -1;
    animation: heroShift 18s ease-in-out infinite alternate;
}

@keyframes heroShift {
    0% {
        transform: translate(0, 0);
    }
    100% {
        transform: translate(-2%, -2%);
    }
}

.hero::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--c-primary), var(--c-accent), var(--c-primary-light));
    z-index: -1;
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--sp-6);
    flex-wrap: wrap;
}

.hero-content {
    flex: 1 1 500px;
    animation: fadeInUp 0.7s ease-out both;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--sp-2);
    background: rgba(255, 255, 255, 0.12);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-pill);
    padding: var(--sp-2) var(--sp-4);
    font-size: var(--fs-small);
    font-weight: 600;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    margin-bottom: var(--sp-5);
    backdrop-filter: blur(4px);
}

.hero-title {
    font-family: var(--font-serif);
    font-size: clamp(2rem, 4.5vw, 3.25rem);
    font-weight: 700;
    line-height: 1.15;
    color: #fff;
    margin-bottom: var(--sp-4);
    letter-spacing: -0.5px;
}

.hero-title span {
    color: var(--c-primary-light);
    position: relative;
    white-space: nowrap;
}

.hero-subtitle {
    font-size: clamp(1rem, 1.5vw, 1.25rem);
    line-height: 1.6;
    color: rgba(255, 255, 255, 0.85);
    margin-bottom: var(--sp-6);
    max-width: 550px;
}

.hero-cta-group {
    display: flex;
    gap: var(--sp-3);
    flex-wrap: wrap;
    margin-bottom: var(--sp-6);
}

.hero-cta-primary {
    display: inline-flex;
    align-items: center;
    gap: var(--sp-2);
    padding: var(--sp-4) var(--sp-6);
    background: var(--c-primary);
    color: #fff;
    border-radius: var(--radius-btn);
    font-weight: 700;
    font-size: 1.0625rem;
    text-decoration: none;
    border: 2px solid var(--c-primary);
    transition: all var(--transition-base);
    box-shadow: var(--shadow-lg);
    min-height: 48px;
}

.hero-cta-primary:hover {
    background: var(--c-primary-dark);
    border-color: var(--c-primary-dark);
    color: #fff;
    text-decoration: none;
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
}

.hero-cta-secondary {
    display: inline-flex;
    align-items: center;
    gap: var(--sp-2);
    padding: var(--sp-4) var(--sp-6);
    background: transparent;
    color: #fff;
    border-radius: var(--radius-btn);
    font-weight: 700;
    font-size: 1.0625rem;
    text-decoration: none;
    border: 2px solid rgba(255, 255, 255, 0.4);
    transition: all var(--transition-base);
    min-height: 48px;
}

.hero-cta-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.7);
    color: #fff;
    text-decoration: none;
    transform: translateY(-2px);
}

.hero-social-proof {
    display: flex;
    flex-wrap: wrap;
    gap: var(--sp-4);
    font-size: var(--fs-small);
    color: rgba(255, 255, 255, 0.7);
}

.hero-social-proof span {
    display: inline-flex;
    align-items: center;
    gap: var(--sp-2);
}

.hero-social-proof .emoji-icon {
    font-size: 1.125rem;
}

/* Hero 视觉卡片 */
.hero-visual {
    flex: 0 1 380px;
    animation: fadeInUp 0.9s ease-out 0.2s both;
}

.hero-visual-card {
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: var(--radius-card);
    padding: var(--sp-5);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-xl);
}

.hero-visual-card img,
.hero-visual-card svg {
    width: 100%;
    height: auto;
    border-radius: var(--radius-img);
    margin-bottom: var(--sp-4);
}

.hero-visual-card .hero-visual-label {
    font-size: var(--fs-small);
    color: rgba(255, 255, 255, 0.8);
    text-align: center;
    font-weight: 500;
}

/* ============ 2. 信任条（Hero 下方） ============ */
.hero-trust-strip {
    background: var(--c-bg-white);
    border-bottom: 1px solid var(--c-border-light);
    box-shadow: var(--shadow-sm);
    position: relative;
    z-index: 10;
}

.hero-trust-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--sp-4) var(--sp-5);
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--sp-5);
}

.hero-trust-item {
    display: flex;
    align-items: center;
    gap: var(--sp-3);
    font-size: var(--fs-small);
    color: var(--c-text-light);
    font-weight: 500;
}

.hero-trust-icon {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--c-success);
    font-size: 1rem;
    flex-shrink: 0;
    background: var(--c-bg);
}

/* ============ 3. 筒仓入口导航 ============ */
.silo-section {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--sp-7) var(--sp-5);
}

.silo-section-title {
    text-align: center;
    margin-bottom: var(--sp-6);
}

.silo-section-title h2 {
    font-size: 1.75rem;
    color: var(--c-secondary);
    margin-bottom: var(--sp-2);
}

.silo-section-title p {
    color: var(--c-text-muted);
    font-size: var(--fs-body);
    max-width: 600px;
    margin: 0 auto;
}

.silo-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: var(--sp-5);
}

.silo-card {
    background: var(--c-bg-white);
    border: 2px solid var(--c-border-light);
    border-radius: var(--radius-card);
    overflow: hidden;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-sm);
    text-decoration: none;
    display: flex;
    flex-direction: column;
    position: relative;
}

.silo-card:hover {
    border-color: var(--c-primary);
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
    text-decoration: none;
}

.silo-card-icon {
    padding: var(--sp-5);
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--c-bg);
    position: relative;
    overflow: hidden;
}

.silo-card-icon svg,
.silo-card-icon .silo-icon-placeholder {
    width: 64px;
    height: 64px;
    color: var(--c-primary);
}

.silo-card-body {
    padding: var(--sp-4) var(--sp-5) var(--sp-5);
    flex: 1;
    display: flex;
    flex-direction: column;
}

.silo-card-title {
    font-family: var(--font-serif);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--c-secondary);
    margin-bottom: var(--sp-2);
}

.silo-card-desc {
    font-size: var(--fs-small);
    color: var(--c-text-light);
    line-height: 1.6;
    margin-bottom: var(--sp-4);
    flex: 1;
}

.silo-card-link {
    font-weight: 700;
    font-size: var(--fs-small);
    color: var(--c-primary);
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.silo-card-link::after {
    content: '→';
    transition: transform var(--transition-fast);
}

.silo-card:hover .silo-card-link::after {
    transform: translateX(4px);
}

/* ============ 4. 精选内容区 ============ */
.featured-section {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--sp-6) var(--sp-5) var(--sp-7);
}

.featured-header {
    text-align: center;
    margin-bottom: var(--sp-5);
}

.featured-header h2 {
    font-size: 1.75rem;
    color: var(--c-secondary);
    margin-bottom: var(--sp-2);
}

.featured-header p {
    color: var(--c-text-muted);
    max-width: 600px;
    margin: 0 auto;
}

.featured-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--sp-5);
    align-items: start;
}

.featured-card {
    background: var(--c-bg-white);
    border: 1px solid var(--c-border-light);
    border-radius: var(--radius-card);
    overflow: hidden;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-sm);
    display: flex;
    flex-direction: column;
}

.featured-card:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--c-border);
    transform: translateY(-2px);
}

.featured-card img,
.featured-card svg {
    width: 100%;
    height: auto;
    border-radius: 0;
}

.featured-card-body {
    padding: var(--sp-4) var(--sp-5) var(--sp-5);
    flex: 1;
    display: flex;
    flex-direction: column;
}

.featured-card-category {
    font-size: var(--fs-small);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--c-primary);
    margin-bottom: var(--sp-2);
}

.featured-card-title {
    font-family: var(--font-serif);
    font-size: 1.125rem;
    font-weight: 700;
    margin-bottom: var(--sp-2);
}

.featured-card-title a {
    color: var(--c-secondary);
    text-decoration: none;
}

.featured-card-title a:hover {
    color: var(--c-primary);
    text-decoration: none;
}

.featured-card-summary {
    font-size: var(--fs-small);
    color: var(--c-text-light);
    line-height: 1.6;
    flex: 1;
}

.featured-card-meta {
    display: flex;
    align-items: center;
    gap: var(--sp-3);
    font-size: var(--fs-small);
    color: var(--c-text-muted);
    padding-top: var(--sp-3);
    border-top: 1px solid var(--c-border-light);
}

/* ============ 5. Why Trust Us 区 ============ */
.trust-section {
    background: var(--c-secondary);
    color: rgba(255, 255, 255, 0.85);
    padding: var(--sp-7) var(--sp-5) var(--sp-6);
    position: relative;
    overflow: hidden;
}

.trust-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(circle at 20% 30%, rgba(194, 94, 58, 0.15) 100px, transparent 100px),
        radial-gradient(circle at 80% 70%, rgba(212, 162, 76, 0.1) 120px, transparent 120px);
    pointer-events: none;
}

.trust-container {
    max-width: 1200px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.trust-header {
    text-align: center;
    margin-bottom: var(--sp-6);
}

.trust-header h2 {
    font-size: 1.75rem;
    color: #fff;
    margin-bottom: var(--sp-2);
}

.trust-header p {
    color: rgba(255, 255, 255, 0.75);
    max-width: 600px;
    margin: 0 auto;
}

.trust-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: var(--sp-5);
}

.trust-card {
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: var(--radius-card);
    padding: var(--sp-5);
    text-align: center;
    transition: all var(--transition-base);
    backdrop-filter: blur(4px);
}

.trust-card:hover {
    background: rgba(255, 255, 255, 0.12);
    border-color: rgba(255, 255, 255, 0.25);
    transform: translateY(-2px);
}

.trust-card-icon {
    width: 48px;
    height: 48px;
    margin: 0 auto var(--sp-3);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--c-primary);
    color: #fff;
    font-size: 1.5rem;
}

.trust-card-title {
    font-size: 1.0625rem;
    font-weight: 700;
    color: #fff;
    margin-bottom: var(--sp-2);
}

.trust-card-desc {
    font-size: var(--fs-small);
    line-height: 1.6;
    color: rgba(255, 255, 255, 0.8);
}

/* ============ 6. 动画 ============ */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(24px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ============ 7. 首屏价值可见 ============ */
/* 首屏内联 CSS 由 publish.php 或建站时直接内嵌在 <head> 的 <style> 中，
   确保在外部 CSS 加载前，H1、CTA 和信任信号已可见。 */

/* ============ 8. 移动端响应式 ============ */
@media screen and (max-width: 1024px) {
    .hero-container {
        gap: var(--sp-5);
    }

    .hero-visual {
        flex: 0 1 320px;
    }
}

@media screen and (max-width: 768px) {
    .hero {
        padding: var(--sp-6) var(--sp-4) var(--sp-5);
    }

    .hero-container {
        flex-direction: column;
        align-items: stretch;
        text-align: center;
    }

    .hero-content {
        flex: 1 1 auto;
    }

    .hero-subtitle {
        margin-left: auto;
        margin-right: auto;
    }

    .hero-cta-group {
        justify-content: center;
    }

    .hero-social-proof {
        justify-content: center;
    }

    .hero-visual {
        flex: 1 1 auto;
        max-width: 320px;
        margin: 0 auto;
    }

    .hero-trust-container {
        gap: var(--sp-3);
    }

    .hero-trust-item {
        font-size: 0.8125rem;
    }

    .silo-section {
        padding: var(--sp-5) var(--sp-4);
    }

    .silo-grid {
        grid-template-columns: 1fr;
        gap: var(--sp-4);
    }

    .featured-section {
        padding: var(--sp-5) var(--sp-4);
    }

    .featured-grid {
        grid-template-columns: 1fr;
        gap: var(--sp-4);
    }

    .trust-section {
        padding: var(--sp-5) var(--sp-4);
    }

    .trust-grid {
        grid-template-columns: 1fr;
        gap: var(--sp-4);
    }
}

@media screen and (max-width: 480px) {
    .hero-title {
        font-size: 1.75rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .hero-cta-primary,
    .hero-cta-secondary {
        width: 100%;
        justify-content: center;
        font-size: 1rem;
        padding: var(--sp-3) var(--sp-4);
    }

    .hero-social-proof {
        flex-direction: column;
        gap: var(--sp-2);
        align-items: center;
    }

    .hero-trust-strip {
        display: block;
    }

    .silo-card-icon {
        padding: var(--sp-4);
    }

    .silo-card-icon svg {
        width: 48px;
        height: 48px;
    }

    .silo-card-title {
        font-size: 1.125rem;
    }

    .featured-card-title {
        font-size: 1.0625rem;
    }
}