/* ========================================
   青玉枝 QYZ 官网 - 科技绿色主题样式
   ======================================== */

/* CSS Variables */
:root {
    --color-primary: #52B788;
    --color-primary-dark: #40916C;
    --color-secondary: #74C69D;
    --color-accent: #95D5B2;
    --color-light: #B7E4C7;
    --color-lighter: #D8F3DC;
    --color-bg: #FAFFFD;
    --color-text: #1B4332;
    --color-text-light: #6B7280;
    --color-white: #FFFFFF;
    --font-display: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
    --font-body: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    --shadow-sm: 0 2px 8px rgba(82, 183, 136, 0.08);
    --shadow-md: 0 4px 20px rgba(82, 183, 136, 0.12);
    --shadow-lg: 0 8px 40px rgba(82, 183, 136, 0.16);
    --radius: 12px;
    --radius-lg: 20px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

body {
    font-family: var(--font-body);
    color: var(--color-text);
    background: var(--color-bg);
    line-height: 1.6;
    overflow-x: hidden;
}

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

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
}

img {
    max-width: 100%;
    height: auto;
}

/* ========================================
   导航栏 - 渐变背景科技风格
   ======================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 0;
    background: linear-gradient(135deg, #1B4332 0%, #2D6A4F 30%, #40916C 70%, #52B788 100%);
    box-shadow: 0 2px 20px rgba(27, 67, 50, 0.3);
}

.navbar::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, #52B788, #74C69D, #B7E4C7, #74C69D, #52B788);
    opacity: 0.6;
}

.nav-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 32px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-shrink: 0;
}

.logo-img {
    width: 38px;
    height: 38px;
    filter: drop-shadow(0 0 6px rgba(82, 183, 136, 0.4));
}

.logo-text {
    font-family: var(--font-display);
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--color-white);
    letter-spacing: 0.05em;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 8px;
    margin-left: auto;
    margin-right: 24px;
}

.nav-links a {
    font-size: 0.92rem;
    font-weight: 500;
    color: rgba(255, 255, 255, 0.8);
    padding: 8px 18px;
    border-radius: 8px;
    transition: var(--transition);
    position: relative;
}

.nav-links a:hover {
    color: var(--color-white);
    background: rgba(255, 255, 255, 0.1);
}

.nav-links a.active {
    color: var(--color-white);
    background: rgba(255, 255, 255, 0.12);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-shrink: 0;
}

.nav-cta-btn {
    display: inline-flex;
    align-items: center;
    padding: 9px 24px;
    background: linear-gradient(135deg, #52B788, #74C69D);
    color: var(--color-white);
    font-size: 0.9rem;
    font-weight: 600;
    border-radius: 50px;
    border: none;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 0 2px 12px rgba(82, 183, 136, 0.4);
}

.nav-cta-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 20px rgba(82, 183, 136, 0.5);
    background: linear-gradient(135deg, #74C69D, #95D5B2);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
    margin-left: 12px;
}

.nav-toggle span {
    width: 22px;
    height: 2px;
    background: var(--color-white);
    border-radius: 2px;
    transition: var(--transition);
}

/* ========================================
   Hero 区域
   ======================================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 120px 24px 60px;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, #D8F3DC 0%, #FAFFFD 50%, #FAFFFD 100%);
    z-index: -2;
}

.hero-bg::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(circle at 25% 35%, rgba(82, 183, 136, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 75% 55%, rgba(116, 198, 157, 0.06) 0%, transparent 50%);
}

.hero-bg::after {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        radial-gradient(circle at 1px 1px, rgba(82, 183, 136, 0.06) 1px, transparent 0);
    background-size: 40px 40px;
    z-index: -1;
}

.hero-content {
    max-width: 680px;
    animation: fadeInUp 1s ease-out;
}

.hero-logo {
    margin-bottom: 24px;
}

.hero-logo img {
    width: 130px;
    height: 130px;
    filter: drop-shadow(0 4px 16px rgba(82, 183, 136, 0.2));
}

.hero-title {
    font-family: var(--font-display);
    font-size: 3.8rem;
    font-weight: 800;
    background: linear-gradient(135deg, #1B4332, #52B788, #74C69D);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: 0.08em;
    margin-bottom: 12px;
}

.hero-subtitle {
    font-family: var(--font-display);
    font-size: 1.4rem;
    color: var(--color-accent);
    letter-spacing: 0.25em;
    margin-bottom: 24px;
    font-weight: 500;
}

.hero-desc {
    font-size: 1.1rem;
    color: var(--color-text-light);
    line-height: 1.8;
    margin-bottom: 40px;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 36px;
    border-radius: 50px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    border: 2px solid transparent;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: var(--color-white);
    border-color: transparent;
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary));
    transform: translateY(-2px);
    box-shadow: 0 6px 24px rgba(82, 183, 136, 0.35);
}

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

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

.btn-block {
    width: 100%;
}

.hero-scroll {
    position: absolute;
    bottom: 30px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: var(--color-text-light);
    font-size: 0.85rem;
    animation: bounce 2s infinite;
}

.scroll-arrow {
    width: 20px;
    height: 20px;
    border-right: 2px solid var(--color-text-light);
    border-bottom: 2px solid var(--color-text-light);
    transform: rotate(45deg);
}

/* ========================================
   Section 通用
   ======================================== */
.section {
    padding: 100px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-tag {
    display: inline-block;
    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 0.2em;
    color: var(--color-accent);
    text-transform: uppercase;
    margin-bottom: 12px;
}

.section-title {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 16px;
}

.section-divider {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0;
    margin-top: 8px;
}

.section-divider::before,
.section-divider::after {
    content: '';
    width: 50px;
    height: 2px;
    background: linear-gradient(90deg, var(--color-accent), var(--color-secondary));
    border-radius: 2px;
}

/* ========================================
   关于我们
   ======================================== */
.about {
    background: var(--color-white);
}

.about-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.about-card {
    text-align: center;
    padding: 48px 32px;
    border-radius: var(--radius-lg);
    background: var(--color-bg);
    border: 1px solid rgba(82, 183, 136, 0.08);
    transition: var(--transition);
}

.about-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--color-accent);
}

.about-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 24px;
}

.about-icon svg {
    width: 100%;
    height: 100%;
}

.about-card h3 {
    font-family: var(--font-display);
    font-size: 1.4rem;
    color: var(--color-text);
    margin-bottom: 16px;
}

.about-card p {
    color: var(--color-text-light);
    line-height: 1.8;
}

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

.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.service-card {
    border-radius: var(--radius-lg);
    overflow: hidden;
    background: var(--color-white);
    box-shadow: var(--shadow-sm);
    padding: 40px 32px;
    transition: var(--transition);
    border: 1px solid rgba(82, 183, 136, 0.06);
}

.service-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--color-accent);
}

.service-icon {
    width: 64px;
    height: 64px;
    margin-bottom: 24px;
}

.service-icon svg {
    width: 100%;
    height: 100%;
}

.service-card h3 {
    font-family: var(--font-display);
    font-size: 1.3rem;
    color: var(--color-text);
    margin-bottom: 12px;
}

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

/* ========================================
   解决方案
   ======================================== */
.solutions {
    background: var(--color-white);
}

.solutions-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
}

.solution-card {
    padding: 40px 36px;
    border-radius: var(--radius-lg);
    background: var(--color-bg);
    border: 1px solid rgba(82, 183, 136, 0.08);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.solution-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: linear-gradient(180deg, var(--color-primary), var(--color-secondary));
    border-radius: 0 4px 4px 0;
    opacity: 0;
    transition: var(--transition);
}

.solution-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: var(--color-light);
}

.solution-card:hover::before {
    opacity: 1;
}

.solution-number {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 12px;
    line-height: 1;
}

.solution-card h3 {
    font-family: var(--font-display);
    font-size: 1.3rem;
    color: var(--color-text);
    margin-bottom: 12px;
}

.solution-card p {
    color: var(--color-text-light);
    line-height: 1.7;
    font-size: 0.95rem;
}

/* ========================================
   联系我们
   ======================================== */
.contact {
    background: var(--color-bg);
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 48px;
    align-items: start;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 28px;
}

.contact-item {
    display: flex;
    gap: 16px;
    align-items: flex-start;
}

.contact-icon {
    font-size: 1.5rem;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-lighter);
    border-radius: 12px;
    flex-shrink: 0;
}

.contact-item h4 {
    font-size: 0.95rem;
    color: var(--color-text);
    margin-bottom: 4px;
}

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

.contact-form {
    background: var(--color-white);
    padding: 36px;
    border-radius: var(--radius-lg);
    border: 1px solid rgba(82, 183, 136, 0.08);
    box-shadow: var(--shadow-sm);
}

.form-group {
    margin-bottom: 16px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 14px 18px;
    border: 1px solid rgba(82, 183, 136, 0.15);
    border-radius: var(--radius);
    font-size: 0.95rem;
    font-family: var(--font-body);
    background: var(--color-bg);
    color: var(--color-text);
    transition: var(--transition);
    outline: none;
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(82, 183, 136, 0.12);
    background: var(--color-white);
}

.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

/* ========================================
   页脚
   ======================================== */
.footer {
    background: linear-gradient(135deg, #1B4332 0%, #2D6A4F 50%, #40916C 100%);
    color: var(--color-white);
    padding: 48px 0 24px;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 24px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    margin-bottom: 24px;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 16px;
}

.footer-logo {
    width: 44px;
    height: 44px;
    filter: brightness(1.3);
}

.footer-brand p {
    font-family: var(--font-display);
    color: var(--color-light);
    font-size: 1.05rem;
}

.footer-links {
    display: flex;
    gap: 24px;
}

.footer-links a {
    color: var(--color-lighter);
    opacity: 0.7;
    font-size: 0.95rem;
}

.footer-links a:hover {
    opacity: 1;
    color: var(--color-light);
}

.footer-bottom {
    text-align: center;
    color: var(--color-lighter);
    opacity: 0.5;
    font-size: 0.85rem;
}

/* ========================================
   AI 智能客服聊天窗口
   ======================================== */
.chat-widget {
    position: fixed;
    bottom: 24px;
    right: 24px;
    z-index: 9999;
    font-family: var(--font-body);
}

.chat-toggle {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 20px rgba(82, 183, 136, 0.4);
    transition: var(--transition);
    color: white;
}

.chat-toggle:hover {
    transform: scale(1.1);
    box-shadow: 0 6px 28px rgba(82, 183, 136, 0.5);
}

.chat-toggle svg {
    width: 28px;
    height: 28px;
}

.chat-window {
    position: absolute;
    bottom: 76px;
    right: 0;
    width: 380px;
    height: 540px;
    background: var(--color-white);
    border-radius: var(--radius-lg);
    box-shadow: 0 12px 48px rgba(0, 0, 0, 0.15);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    transform: scale(0) translateY(20px);
    transform-origin: bottom right;
    opacity: 0;
    pointer-events: none;
    transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

.chat-window.open {
    transform: scale(1) translateY(0);
    opacity: 1;
    pointer-events: all;
}

.chat-header {
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    padding: 16px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.chat-header-info {
    display: flex;
    align-items: center;
    gap: 12px;
}

.chat-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--color-white);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.chat-avatar img {
    width: 32px;
    height: 32px;
}

.chat-header h4 {
    color: var(--color-white);
    font-size: 1rem;
    font-weight: 600;
}

.chat-status {
    font-size: 0.8rem;
    color: var(--color-lighter);
    display: flex;
    align-items: center;
    gap: 6px;
}

.chat-status::before {
    content: '';
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: #4ADE80;
    display: inline-block;
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 16px;
    background: #F5F3FF;
}

.message {
    display: flex;
    gap: 10px;
    max-width: 85%;
    animation: messageIn 0.3s ease-out;
}

.bot-message {
    align-self: flex-start;
}

.user-message {
    align-self: flex-end;
    flex-direction: row-reverse;
}

.message-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--color-lighter);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    overflow: hidden;
}

.message-avatar img {
    width: 24px;
    height: 24px;
}

.user-message .message-avatar {
    background: var(--color-primary);
    color: white;
    font-size: 0.8rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    justify-content: center;
}

.message-bubble {
    padding: 12px 16px;
    border-radius: 16px;
    line-height: 1.6;
    font-size: 0.9rem;
}

.bot-message .message-bubble {
    background: var(--color-white);
    color: var(--color-text);
    border: 1px solid rgba(82, 183, 136, 0.08);
    border-bottom-left-radius: 4px;
}

.user-message .message-bubble {
    background: var(--color-primary);
    color: var(--color-white);
    border-bottom-right-radius: 4px;
}

.message-bubble p {
    margin-bottom: 6px;
}

.message-bubble p:last-child {
    margin-bottom: 0;
}

.chat-suggestions {
    padding: 8px 16px;
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    border-top: 1px solid rgba(0,0,0,0.05);
    background: #F5F3FF;
}

.suggestion-btn {
    padding: 6px 14px;
    border: 1px solid var(--color-accent);
    border-radius: 20px;
    background: var(--color-white);
    color: var(--color-primary);
    font-size: 0.8rem;
    cursor: pointer;
    transition: var(--transition);
    font-family: var(--font-body);
}

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

.chat-input-area {
    padding: 12px 16px;
    display: flex;
    gap: 10px;
    border-top: 1px solid rgba(0,0,0,0.05);
    background: var(--color-white);
}

.chat-input-area input {
    flex: 1;
    padding: 10px 16px;
    border: 1px solid rgba(82, 183, 136, 0.15);
    border-radius: 24px;
    font-size: 0.9rem;
    outline: none;
    transition: var(--transition);
    font-family: var(--font-body);
}

.chat-input-area input:focus {
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(149, 213, 178, 0.1);
}

.chat-send-btn {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--color-primary);
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    transition: var(--transition);
    flex-shrink: 0;
}

.chat-send-btn:hover {
    background: var(--color-primary-dark);
}

.chat-send-btn svg {
    width: 18px;
    height: 18px;
}

/* Typing indicator */
.typing-indicator {
    display: flex;
    gap: 4px;
    padding: 4px 0;
}

.typing-indicator span {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--color-accent);
    animation: typingBounce 1.4s infinite ease-in-out;
}

.typing-indicator span:nth-child(2) { animation-delay: 0.2s; }
.typing-indicator span:nth-child(3) { animation-delay: 0.4s; }

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

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
    40% { transform: translateY(-10px); }
    60% { transform: translateY(-5px); }
}

@keyframes typingBounce {
    0%, 80%, 100% { transform: scale(0.6); opacity: 0.4; }
    40% { transform: scale(1); opacity: 1; }
}

@keyframes messageIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Scroll reveal */
.reveal {
    opacity: 0;
    transform: translateY(40px);
    transition: all 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

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

/* ========================================
   响应式设计
   ======================================== */
@media (max-width: 968px) {
    .about-grid,
    .services-grid {
        grid-template-columns: 1fr;
        max-width: 500px;
        margin: 0 auto;
    }

    .solutions-grid {
        grid-template-columns: 1fr;
        max-width: 500px;
        margin: 0 auto;
    }

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

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

    .section-title {
        font-size: 2rem;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: linear-gradient(180deg, #1B4332, #2D6A4F);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 20px;
        gap: 8px;
        box-shadow: 0 8px 32px rgba(27, 67, 50, 0.3);
    }

    .nav-links.active {
        display: flex;
    }

    .nav-links a {
        padding: 12px 18px;
        border-radius: 8px;
    }

    .nav-toggle {
        display: flex;
    }

    .nav-cta-btn {
        display: none;
    }

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

    .hero-subtitle {
        font-size: 1.2rem;
        letter-spacing: 0.15em;
    }

    .footer-content {
        flex-direction: column;
        gap: 24px;
        text-align: center;
    }

    .chat-window {
        width: calc(100vw - 48px);
        height: calc(100vh - 120px);
        right: -12px;
    }

    .form-row {
        grid-template-columns: 1fr;
    }
}

/* Scrollbar styling */
.chat-messages::-webkit-scrollbar {
    width: 4px;
}

.chat-messages::-webkit-scrollbar-track {
    background: transparent;
}

.chat-messages::-webkit-scrollbar-thumb {
    background: var(--color-light);
    border-radius: 4px;
}