/* ========================================
   Oliver Lotion · Cold Luxury 品牌官网
   色彩: #0c0e0d / #ececea / #888a87 / #4a7c59
   字体: Cormorant Garamond (标题) / Noto Sans SC (正文)
======================================== */

:root {
    --color-black: #0c0e0d;
    --color-ivory: #ececea;
    --color-gray: #888a87;
    --color-gray-light: #d8d9d6;
    --color-gray-dark: #2e312f;
    --color-accent: #4a7c59;
    --color-accent-dark: #3a6147;
    --color-white: #ffffff;

    --font-display: 'Cormorant Garamond', 'Noto Serif SC', serif;
    --font-body: 'Noto Sans SC', -apple-system, sans-serif;

    --transition: 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --transition-slow: 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
}

/* Reset */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-body);
    font-weight: 300;
    color: var(--color-black);
    background: var(--color-ivory);
    line-height: 1.7;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

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

a {
    text-decoration: none;
    color: inherit;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.9rem 2rem;
    font-family: var(--font-body);
    font-size: 0.85rem;
    font-weight: 400;
    letter-spacing: 0.05em;
    border: none;
    cursor: pointer;
    transition: var(--transition);
    text-transform: uppercase;
}

.btn i {
    font-size: 1rem;
    transition: transform var(--transition);
}

.btn:hover i {
    transform: translateX(4px);
}

.btn-light {
    background: transparent;
    color: var(--color-white);
    border: 1px solid rgba(255, 255, 255, 0.4);
}

.btn-light:hover {
    background: var(--color-white);
    color: var(--color-black);
    border-color: var(--color-white);
}

.btn-dark {
    background: var(--color-black);
    color: var(--color-white);
}

.btn-dark:hover {
    background: var(--color-accent);
    color: var(--color-white);
}

.btn-accent {
    background: var(--color-accent);
    color: var(--color-white);
}

.btn-accent:hover {
    background: var(--color-accent-dark);
}

.btn-sm {
    padding: 0.65rem 1.3rem;
    font-size: 0.78rem;
}

/* Navigation */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    transition: var(--transition);
    padding: 1.5rem 0;
}

.nav.scrolled {
    background: rgba(247, 245, 242, 0.92);
    backdrop-filter: blur(12px);
    padding: 1rem 0;
    border-bottom: 1px solid var(--color-gray-light);
}

.nav-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 500;
    letter-spacing: 0.02em;
    color: var(--color-white);
    transition: color var(--transition);
}

.nav.scrolled .nav-logo {
    color: var(--color-black);
}

.nav-links {
    display: flex;
    gap: 2.5rem;
    align-items: center;
}

.nav-links a {
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.85);
    transition: color var(--transition);
    position: relative;
}

.nav.scrolled .nav-links a {
    color: var(--color-gray-dark);
}

.nav-links a:not(.nav-cta)::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--color-accent);
    transition: width var(--transition);
}

.nav-links a:not(.nav-cta):hover::after {
    width: 100%;
}

.nav-links a:hover {
    color: var(--color-accent);
}

.nav-cta {
    border: 1px solid rgba(255, 255, 255, 0.4);
    padding: 0.5rem 1.3rem;
    border-radius: 0;
}

.nav.scrolled .nav-cta {
    border-color: var(--color-black);
}

.nav-cta:hover {
    background: var(--color-accent);
    border-color: var(--color-accent) !important;
    color: var(--color-white) !important;
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--color-white);
    font-size: 1.5rem;
    cursor: pointer;
}

.nav.scrolled .nav-toggle {
    color: var(--color-black);
}

.nav-mobile {
    display: none;
    flex-direction: column;
    background: var(--color-ivory);
    padding: 1rem 2rem;
    gap: 1rem;
}

.nav-mobile.open {
    display: flex;
}

.nav-mobile a {
    font-size: 0.9rem;
    color: var(--color-gray-dark);
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--color-gray-light);
}

.nav-cta-mobile {
    margin-top: 0.5rem;
    text-align: center;
    background: var(--color-black);
    color: var(--color-white) !important;
    padding: 0.8rem !important;
    border: none !important;
}

/* Hero Section */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    overflow: hidden;
    background: var(--color-black);
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #0a0a0a 0%, #1a1715 50%, #0a0a0a 100%);
}

.hero-bg::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at 70% 50%, rgba(74, 124, 89, 0.1) 0%, transparent 50%);
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
    width: 100%;
}

.hero-text {
    color: var(--color-white);
}

.hero-eyebrow {
    font-family: var(--font-display);
    font-size: 1rem;
    font-style: italic;
    color: var(--color-accent);
    letter-spacing: 0.1em;
    margin-bottom: 1.5rem;
    opacity: 0;
    animation: fadeInUp 0.8s var(--ease-out) 0.2s forwards;
}

.hero-title {
    font-family: var(--font-display);
    font-size: 4.5rem;
    font-weight: 400;
    line-height: 1.15;
    letter-spacing: -0.01em;
    margin-bottom: 1.5rem;
    opacity: 0;
    animation: fadeInUp 0.8s var(--ease-out) 0.4s forwards;
}

.hero-sub {
    font-size: 1rem;
    line-height: 1.8;
    color: rgba(255, 255, 255, 0.6);
    margin-bottom: 2.5rem;
    opacity: 0;
    animation: fadeInUp 0.8s var(--ease-out) 0.6s forwards;
}

.hero-text .btn {
    opacity: 0;
    animation: fadeInUp 0.8s var(--ease-out) 0.8s forwards;
}

.hero-image {
    position: relative;
    opacity: 0;
    animation: fadeIn 1.2s var(--ease-out) 0.5s forwards;
}

.hero-image img {
    width: 100%;
    border-radius: 2px;
    box-shadow: 0 40px 80px rgba(0, 0, 0, 0.5);
}

.hero-image::before {
    content: '';
    position: absolute;
    top: -20px;
    right: -20px;
    width: 100%;
    height: 100%;
    border: 1px solid rgba(74, 124, 89, 0.2);
    z-index: -1;
}

/* Scroll cue removed per design audit */

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* Section Common */
.section-header {
    margin-bottom: 4rem;
}

.section-header-center {
    text-align: center;
}

.section-label {
    font-size: 0.75rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--color-accent);
    margin-bottom: 1rem;
}

.section-label-light {
    color: var(--color-accent);
}

.section-title {
    font-family: var(--font-display);
    font-size: 3rem;
    font-weight: 400;
    line-height: 1.2;
    color: var(--color-black);
}

/* Philosophy Section */
.philosophy {
    padding: 7rem 0;
    background: var(--color-ivory);
}

.philosophy-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: 5rem;
    align-items: center;
}

.philosophy-text p {
    font-size: 1.05rem;
    color: var(--color-gray-dark);
    margin-bottom: 1.5rem;
    line-height: 1.9;
}

.philosophy-emphasis {
    font-family: var(--font-display);
    font-size: 1.8rem;
    font-style: italic;
    color: var(--color-black) !important;
    font-weight: 500;
}

.philosophy-stats {
    display: flex;
    flex-direction: column;
    gap: 2.5rem;
    padding-left: 3rem;
    border-left: 1px solid var(--color-gray-light);
}

.stat {
    display: flex;
    flex-direction: column;
}

.stat-number {
    font-family: var(--font-display);
    font-size: 3.5rem;
    font-weight: 500;
    color: var(--color-black);
    line-height: 1;
}

.stat-unit {
    font-size: 1.5rem;
    color: var(--color-accent);
}

.stat-label {
    font-size: 0.8rem;
    letter-spacing: 0.1em;
    color: var(--color-gray);
    margin-top: 0.5rem;
    text-transform: uppercase;
}

/* Products Section */
.products {
    padding: 7rem 0;
    background: var(--color-white);
}

.product-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.product-card {
    background: var(--color-ivory);
    border-radius: 2px;
    overflow: hidden;
    transition: transform var(--transition), box-shadow var(--transition);
    display: flex;
    flex-direction: column;
}

.product-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.08);
}

.product-card-featured {
    background: var(--color-black);
}

.product-card-featured .product-tag,
.product-card-featured .product-name,
.product-card-featured .product-desc,
.product-card-featured .product-price {
    color: var(--color-white);
}

.product-card-featured .product-volume {
    color: var(--color-gray);
}

.product-card-featured .btn-dark {
    background: var(--color-accent);
}

.product-card-featured .btn-dark:hover {
    background: var(--color-white);
    color: var(--color-black);
}

.product-image {
    aspect-ratio: 4 / 3;
    overflow: hidden;
    background: var(--color-gray-light);
}

.product-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.product-card:hover .product-image img {
    transform: scale(1.05);
}

.product-info {
    padding: 2rem;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.product-tag {
    font-size: 0.7rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--color-accent);
    margin-bottom: 0.8rem;
}

.product-name {
    font-family: var(--font-display);
    font-size: 1.6rem;
    font-weight: 500;
    color: var(--color-black);
    margin-bottom: 0.8rem;
}

.product-desc {
    font-size: 0.9rem;
    color: var(--color-gray-dark);
    line-height: 1.7;
    margin-bottom: 1.5rem;
    flex-grow: 1;
}

.product-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 1.5rem;
    border-top: 1px solid var(--color-gray-light);
}

.product-card-featured .product-bottom {
    border-top-color: rgba(255, 255, 255, 0.1);
}

.product-price {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 500;
    color: var(--color-black);
}

.product-volume {
    font-size: 0.85rem;
    color: var(--color-gray);
    font-weight: 300;
}

/* Science Section */
.science {
    padding: 7rem 0;
    background: var(--color-ivory);
}

.science-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 5rem;
    align-items: center;
}

.science-image img {
    width: 100%;
    border-radius: 2px;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.08);
}

.science-body {
    font-size: 1rem;
    color: var(--color-gray-dark);
    line-height: 1.9;
    margin: 1.5rem 0 2.5rem;
}

.science-features {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

.feature {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    font-size: 0.9rem;
    color: var(--color-gray-dark);
}

.feature i {
    font-size: 1.5rem;
    color: var(--color-accent);
}

/* Testimonials Section */
.testimonials {
    padding: 7rem 0;
    background: var(--color-white);
}

.testimonial-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.testimonial-card {
    padding: 2.5rem;
    background: var(--color-ivory);
    border-radius: 2px;
    transition: transform var(--transition);
}

.testimonial-card:hover {
    transform: translateY(-5px);
}

.testimonial-stars {
    display: flex;
    gap: 0.2rem;
    margin-bottom: 1.2rem;
}

.testimonial-stars i {
    color: var(--color-accent);
    font-size: 1rem;
}

.testimonial-text {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-style: italic;
    line-height: 1.7;
    color: var(--color-black);
    margin-bottom: 1.5rem;
}

.testimonial-author {
    display: flex;
    flex-direction: column;
}

.author-name {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-black);
}

.author-meta {
    font-size: 0.8rem;
    color: var(--color-gray);
    margin-top: 0.2rem;
}

/* Join Section */
.join {
    padding: 8rem 0;
    background: var(--color-black);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.join::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at 50% 50%, rgba(74, 124, 89, 0.08) 0%, transparent 60%);
}

.join-content {
    position: relative;
    z-index: 2;
}

.join-title {
    font-family: var(--font-display);
    font-size: 3.5rem;
    font-weight: 400;
    line-height: 1.2;
    color: var(--color-white);
    margin-bottom: 1.5rem;
}

.join-sub {
    font-size: 1rem;
    color: rgba(255, 255, 255, 0.5);
    max-width: 500px;
    margin: 0 auto 2.5rem;
    line-height: 1.8;
}

.join-form {
    display: flex;
    gap: 0;
    max-width: 480px;
    margin: 0 auto;
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: border-color var(--transition);
}

.join-form:focus-within {
    border-color: var(--color-accent);
}

.join-input {
    flex: 1;
    padding: 0.9rem 1.5rem;
    background: transparent;
    border: none;
    color: var(--color-white);
    font-family: var(--font-body);
    font-size: 0.9rem;
    outline: none;
}

.join-input::placeholder {
    color: rgba(255, 255, 255, 0.3);
}

.join-note {
    margin-top: 1rem;
    font-size: 0.85rem;
    color: var(--color-accent);
    min-height: 1.2rem;
}

/* Footer */
.footer {
    background: #060807;
    color: rgba(255, 255, 255, 0.5);
    padding: 4rem 0 2rem;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-logo {
    font-family: var(--font-display);
    font-size: 1.8rem;
    font-weight: 500;
    color: var(--color-white);
    margin-bottom: 1rem;
}

.footer-brand p {
    font-size: 0.85rem;
    line-height: 1.8;
}

.footer-col h4 {
    font-size: 0.8rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--color-white);
    margin-bottom: 1.2rem;
    font-weight: 500;
}

.footer-col a {
    display: block;
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.4);
    margin-bottom: 0.7rem;
    transition: color var(--transition);
}

.footer-col a:hover {
    color: var(--color-accent);
}

.footer-social {
    display: flex;
    gap: 1rem;
    margin-top: 0.5rem;
}

.footer-social a {
    font-size: 1.3rem;
}

.footer-bottom {
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    display: flex;
    justify-content: space-between;
    font-size: 0.8rem;
}

/* Scroll Reveal */
.reveal {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.8s var(--ease-out), transform 0.8s var(--ease-out);
}

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

/* Responsive */
@media (max-width: 968px) {
    .hero-content {
        grid-template-columns: 1fr;
        gap: 3rem;
        text-align: center;
    }

    .hero-title {
        font-size: 3rem;
    }

    .philosophy-grid,
    .science-layout {
        grid-template-columns: 1fr;
        gap: 3rem;
    }

    .philosophy-stats {
        padding-left: 0;
        border-left: none;
        flex-direction: row;
        justify-content: space-around;
    }

    .product-grid,
    .testimonial-grid {
        grid-template-columns: 1fr;
    }

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

    .section-title,
    .join-title {
        font-size: 2.2rem;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .nav-toggle {
        display: block;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .stat-number {
        font-size: 2.5rem;
    }

    .science-features {
        grid-template-columns: 1fr;
    }

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

    .footer-bottom {
        flex-direction: column;
        gap: 0.5rem;
        text-align: center;
    }

    .join-form {
        flex-direction: column;
        border: none;
    }

    .join-input {
        border: 1px solid rgba(255, 255, 255, 0.2);
        margin-bottom: 0.8rem;
    }
}