/* ===== Variables ===== */
:root {
    --color-primary: #c0392b;
    --color-primary-dark: #a93226;
    --color-primary-light: #e74c3c;
    --color-secondary: #2c3e50;
    --color-accent: #e67e22;
    --color-bg: #ffffff;
    --color-bg-alt: #f8f9fa;
    --color-bg-dark: #1a1a2e;
    --color-text: #333333;
    --color-text-light: #6c757d;
    --color-text-white: #ffffff;
    --color-border: #e0e0e0;
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.16);
    --radius: 12px;
    --radius-sm: 8px;
    --transition: 0.3s ease;
    --header-height: 72px;
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: var(--header-height);
}

body {
    font-family: var(--font-family);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
}

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

ul {
    list-style: none;
}

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

/* ===== Utilities ===== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

.section {
    padding: 96px 0;
}

.section__title {
    font-size: 2.25rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 8px;
    color: var(--color-secondary);
}

.section__subtitle {
    text-align: center;
    color: var(--color-text-light);
    font-size: 1.125rem;
    margin-bottom: 56px;
}

.highlight {
    color: var(--color-primary);
}

.btn {
    display: inline-block;
    padding: 14px 32px;
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition);
    border: 2px solid transparent;
    text-align: center;
}

.btn--primary {
    background-color: var(--color-primary);
    color: var(--color-text-white);
    border-color: var(--color-primary);
}

.btn--primary:hover {
    background-color: var(--color-primary-dark);
    border-color: var(--color-primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn--outline {
    background-color: transparent;
    color: var(--color-text-white);
    border-color: var(--color-text-white);
}

.btn--outline:hover {
    background-color: var(--color-text-white);
    color: var(--color-primary);
    transform: translateY(-2px);
}

.btn--full {
    width: 100%;
}

/* ===== Header ===== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
    z-index: 1000;
    transition: box-shadow var(--transition);
}

.header--scrolled {
    box-shadow: var(--shadow-sm);
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 100%;
}

.nav__logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--color-secondary);
}

.logo-image {
    width: 44px;
    height: 44px;
    object-fit: contain;
}

.logo-text {
    display: flex;
    flex-direction: column;
    line-height: 1.2;
}

.logo-sub {
    font-size: 0.7rem;
    font-weight: 400;
    color: var(--color-text-light);
}

.nav__menu {
    display: flex;
    gap: 8px;
}

.nav__link {
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    font-weight: 500;
    font-size: 0.95rem;
    color: var(--color-text);
    transition: all var(--transition);
}

.nav__link:hover,
.nav__link.active {
    color: var(--color-primary);
    background-color: rgba(192, 57, 43, 0.06);
}

.nav__toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.nav__toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--color-secondary);
    border-radius: 2px;
    transition: all var(--transition);
}

/* ===== Hero ===== */
.hero {
    background: linear-gradient(135deg, var(--color-secondary) 0%, #16213e 50%, var(--color-primary-dark) 100%);
    padding: 160px 0 100px;
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
}

.page-hero {
    background: linear-gradient(135deg, var(--color-secondary) 0%, #16213e 50%, var(--color-primary-dark) 100%);
    color: var(--color-text-white);
    padding: 140px 0 56px;
}

.page-hero__title {
    font-size: 2.4rem;
    line-height: 1.2;
    margin-bottom: 10px;
}

.page-hero__subtitle {
    color: rgba(255, 255, 255, 0.82);
    max-width: 720px;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 70% 50%, rgba(192, 57, 43, 0.15) 0%, transparent 60%);
}

.hero__container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero__title {
    font-size: 3.25rem;
    font-weight: 700;
    color: var(--color-text-white);
    line-height: 1.15;
    margin-bottom: 24px;
}

.hero__title .highlight {
    color: var(--color-accent);
}

.hero__description {
    font-size: 1.15rem;
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: 36px;
    line-height: 1.7;
}

.hero__buttons {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

/* Hero Graphic */
.hero__visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero__graphic {
    position: relative;
    width: 360px;
    height: 360px;
}

.graphic-circle {
    position: absolute;
    border-radius: 50%;
    border: 2px solid rgba(255, 255, 255, 0.1);
}

.graphic-circle--1 {
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    animation: spin 20s linear infinite;
}

.graphic-circle--2 {
    width: 75%;
    height: 75%;
    top: 12.5%;
    left: 12.5%;
    border-color: rgba(230, 126, 34, 0.2);
    animation: spin 15s linear infinite reverse;
}

.graphic-circle--3 {
    width: 50%;
    height: 50%;
    top: 25%;
    left: 25%;
    border-color: rgba(192, 57, 43, 0.3);
    animation: spin 10s linear infinite;
}

.graphic-icon {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 4rem;
    color: rgba(255, 255, 255, 0.6);
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* ===== Overview (Home) ===== */
.overview {
    background-color: var(--color-bg-alt);
}

.overview__grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.overview-card {
    background: var(--color-bg);
    padding: 36px 28px;
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    transition: transform var(--transition), box-shadow var(--transition);
}

.overview-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.overview-card__icon {
    font-size: 2.25rem;
    margin-bottom: 14px;
}

.overview-card__title {
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--color-secondary);
    margin-bottom: 10px;
}

.overview-card__text {
    font-size: 0.95rem;
    color: var(--color-text-light);
    line-height: 1.7;
    flex: 1;
    margin-bottom: 20px;
}

.overview-card__link {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--color-primary);
    transition: color var(--transition);
}

.overview-card__link:hover {
    color: var(--color-primary-dark);
}

/* ===== About ===== */
.about {
    background-color: var(--color-bg);
}

.about__grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: start;
}

.about__content p {
    margin-bottom: 16px;
    color: var(--color-text);
    line-height: 1.8;
}

.about__stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}

.stat {
    background: var(--color-bg-alt);
    padding: 28px;
    border-radius: var(--radius);
    transition: transform var(--transition), box-shadow var(--transition);
}

.stat:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.stat__icon {
    font-size: 2rem;
    margin-bottom: 12px;
}

.stat__title {
    font-size: 1.05rem;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--color-secondary);
}

.stat__text {
    font-size: 0.9rem;
    color: var(--color-text-light);
    line-height: 1.6;
}

/* ===== Services ===== */
.services {
    background-color: var(--color-bg-alt);
}

.services__grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.service-card {
    background: var(--color-bg);
    padding: 36px 28px;
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition), box-shadow var(--transition);
    border: 1px solid var(--color-border);
}

.service-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: var(--color-primary);
}

.service-card__icon {
    font-size: 2.5rem;
    margin-bottom: 16px;
}

.service-card__title {
    font-size: 1.15rem;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--color-secondary);
}

.service-card__text {
    font-size: 0.95rem;
    color: var(--color-text-light);
    line-height: 1.7;
}

/* ===== Apps ===== */
.apps {
    background-color: var(--color-bg);
}

.apps__grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 28px;
    max-width: 600px;
    margin: 0 auto;
}

.app-card {
    background: linear-gradient(135deg, var(--color-secondary), #16213e);
    padding: 48px 36px;
    border-radius: var(--radius);
    text-align: center;
    color: var(--color-text-white);
}

.app-card__icon {
    font-size: 3rem;
    margin-bottom: 16px;
}

.app-card__title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 12px;
}

.app-card__text {
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.7;
    margin-bottom: 20px;
}

.app-card__badges {
    display: flex;
    justify-content: center;
    gap: 12px;
}

.badge {
    display: inline-block;
    padding: 6px 18px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 500;
    background: rgba(255, 255, 255, 0.15);
    color: var(--color-text-white);
    border: 1px solid rgba(255, 255, 255, 0.25);
}

/* ===== Contact ===== */
.contact {
    background-color: var(--color-bg-alt);
}

.contact__grid {
    display: grid;
    grid-template-columns: minmax(0, 760px);
    justify-content: center;
    gap: 0;
}

.contact__item {
    display: flex;
    gap: 16px;
    margin-bottom: 28px;
}

.contact__item-icon {
    font-size: 1.5rem;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-bg);
    border-radius: var(--radius-sm);
    flex-shrink: 0;
}

.contact__item h3 {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--color-secondary);
    margin-bottom: 4px;
}

.contact__item p {
    font-size: 0.95rem;
    color: var(--color-text-light);
}

.contact__item a {
    color: var(--color-primary);
    transition: color var(--transition);
}

.contact__item a:hover {
    color: var(--color-primary-dark);
}

.company-name-zh {
    font-size: 0.9rem;
    margin-top: 4px;
}

.contact__form-wrapper {
    background: var(--color-bg);
    padding: 36px;
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border);
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-weight: 500;
    font-size: 0.9rem;
    margin-bottom: 6px;
    color: var(--color-secondary);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-family: var(--font-family);
    font-size: 0.95rem;
    transition: border-color var(--transition), box-shadow var(--transition);
    background-color: var(--color-bg);
    color: var(--color-text);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(192, 57, 43, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

/* ===== Footer ===== */
.footer {
    background-color: var(--color-bg-dark);
    color: rgba(255, 255, 255, 0.7);
    padding: 64px 0 32px;
}

.footer__grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0;
    margin-bottom: 32px;
}

.footer__links h4 {
    font-size: 1rem;
    color: var(--color-text-white);
    margin-bottom: 16px;
}

.footer__links li {
    margin-bottom: 8px;
}

.footer__links a {
    font-size: 0.95rem;
    color: rgba(255, 255, 255, 0.7);
    transition: color var(--transition);
}

.footer__links a:hover {
    color: var(--color-text-white);
}

.footer__bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 24px;
    text-align: center;
    font-size: 0.9rem;
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
    .hero__title {
        font-size: 2.5rem;
    }

    .services__grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .overview__grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .section {
        padding: 64px 0;
    }

    .section__title {
        font-size: 1.75rem;
    }

    /* Mobile nav */
    .nav__menu {
        position: fixed;
        top: var(--header-height);
        right: -100%;
        width: 280px;
        height: calc(100vh - var(--header-height));
        background: var(--color-bg);
        flex-direction: column;
        padding: 32px 24px;
        gap: 4px;
        box-shadow: var(--shadow-lg);
        transition: right var(--transition);
    }

    .nav__menu.show {
        right: 0;
    }

    .nav__toggle {
        display: flex;
    }

    /* Hero */
    .hero {
        padding: 120px 0 60px;
        min-height: auto;
    }

    .page-hero {
        padding: 112px 0 44px;
    }

    .page-hero__title {
        font-size: 1.9rem;
    }

    .hero__container {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .hero__title {
        font-size: 2rem;
    }

    .hero__visual {
        display: none;
    }

    .hero__buttons {
        flex-direction: column;
    }

    .btn--outline {
        color: var(--color-text-white);
        text-align: center;
    }

    /* About */
    .about__grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    /* Overview */
    .overview__grid {
        grid-template-columns: 1fr;
    }

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

    /* Contact */
    .contact__grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    /* Footer */
    .footer__grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }
}