/* 全局样式 - 苹果风格 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Apple 官方颜色值 */
    --primary-color: #1d1d1f;
    --secondary-color: #86868b;
    --accent-color: #0071e3;
    --download-color: #1b8f3e;
    --download-hover-color: #147a34;
    --message-color: #7c3aed;
    --message-hover-color: #6d28d9;
    --light-gray: #f5f5f7;
    --medium-gray: #d2d2d7;
    --white: #ffffff;
    --black: #000000;
    --border-color: rgba(0, 0, 0, 0.1);
    
    /* Apple 风格过渡效果 */
    --transition: all 0.2s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --transition-slow: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    
    /* Apple 风格阴影 */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.1);
    
    /* Apple 风格圆角 */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-full: 980px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'SF Pro Icons', 'Helvetica Neue', Helvetica, Arial, sans-serif;
    font-size: 17px;
    line-height: 1.7;
    color: var(--primary-color);
    background-color: var(--white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

/* 跳转到主要内容（无障碍） */
.skip-link {
    position: absolute;
    left: 16px;
    top: 12px;
    padding: 10px 14px;
    background: var(--primary-color);
    color: var(--white);
    border-radius: var(--radius-sm);
    text-decoration: none;
    transform: translateY(-220%);
    transition: var(--transition);
    z-index: 2000;
}

.skip-link:focus {
    transform: translateY(0);
}

a:focus-visible,
button:focus-visible {
    outline: 3px solid rgba(0, 113, 227, 0.55);
    outline-offset: 3px;
}

/* 容器样式 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 导航栏样式 */
.header {
    background-color: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    transition: var(--transition-slow);
    border-bottom: 1px solid rgba(0, 0, 0, 0.08);
}

.header.scrolled {
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(30px);
    -webkit-backdrop-filter: blur(30px);
    box-shadow: var(--shadow-sm);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1300px;
    margin: 0 auto;
    padding: 0 28px;
    height: 48px;
}

.nav-left,
.nav-right {
    display: flex;
    align-items: center;
}

.nav-left {
    gap: 12px;
}

.nav-right {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    flex-wrap: nowrap;
    gap: 18px;
}

.logo {
    font-size: 19px;
    font-weight: 600;
    color: var(--primary-color);
    text-decoration: none;
    letter-spacing: -0.6px;
    font-variant-numeric: lining-nums;
}

.logo span {
    color: var(--accent-color);
    font-weight: 700;
}

.nav-menu {
    display: inline-flex;
    list-style: none;
    gap: 38px;
    margin: 0;
    padding: 0;
    align-items: center;
    flex: 0 0 auto;
    white-space: nowrap;
}

.nav-link {
    text-decoration: none;
    color: var(--primary-color);
    font-size: 14px;
    font-weight: 400;
    transition: var(--transition);
    position: relative;
    opacity: 0.78;
    letter-spacing: 0.1px;
}

.nav-link:hover {
    opacity: 1;
    color: var(--accent-color);
}

.lang-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    height: 34px;
    min-width: 46px;
    padding: 0 12px;
    border-radius: var(--radius-full);
    border: 1px solid rgba(0, 0, 0, 0.12);
    background: rgba(255, 255, 255, 0.75);
    color: var(--primary-color);
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    letter-spacing: 0.3px;
    touch-action: manipulation;
    position: relative;
    z-index: 1002;
}

.lang-toggle:hover {
    border-color: rgba(0, 113, 227, 0.35);
    color: var(--accent-color);
    background: rgba(255, 255, 255, 0.9);
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px 12px;
    border-radius: var(--radius-sm);
    transition: var(--transition);
    position: relative;
    z-index: 1002;
}

.menu-toggle:hover {
    background-color: rgba(0, 0, 0, 0.06);
}

.bar {
    display: block;
    width: 20px;
    height: 1.5px;
    background-color: var(--primary-color);
    margin: 5px auto;
    transition: var(--transition);
    opacity: 0.8;
}

/* 英雄区域样式 */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 120px 20px 80px;
    background: linear-gradient(180deg, var(--white) 0%, var(--light-gray) 100%);
    overflow: hidden;
}

.hero-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 18px;
    max-width: 800px;
    opacity: 0;
    animation: fadeInUp 0.8s ease-out 0.2s forwards;
    margin-top: -24px;
}

.hero-logo {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
    position: relative;
}

.hero-logo-img {
    width: 96px;
    height: 96px;
    object-fit: contain;
    filter: drop-shadow(0 8px 20px rgba(0, 0, 0, 0.08));
    transition: filter 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.hero-logo::before {
    content: '';
    position: absolute;
    inset: -16px;
    border-radius: 50%;
    background: conic-gradient(from 0deg, #0071e3, #6b8bff, #ff7ac3, #ffd166, #42d6a7, #0071e3);
    opacity: 0;
    transform: scale(0.85);
    filter: blur(18px);
    transition: opacity 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94), transform 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    pointer-events: none;
    z-index: 0;
}

.hero-logo:hover::before {
    opacity: 0.9;
    transform: scale(1.05);
}

.hero-logo:hover .hero-logo-img {
    filter: brightness(0) invert(1) drop-shadow(0 8px 20px rgba(0, 0, 0, 0.08));
}

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

.hero-title {
    font-size: 5rem;
    font-weight: 700;
    line-height: 1.05;
    margin-bottom: 28px;
    letter-spacing: -2.5px;
    color: var(--primary-color);
    font-variant-numeric: lining-nums;
}

.hero-subtitle {
    font-size: 1.875rem;
    font-weight: 400;
    margin-bottom: 48px;
    color: var(--secondary-color);
    letter-spacing: -0.7px;
    line-height: 1.5;
}

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

@media (max-width: 1100px) {
    .nav-container {
        padding: 0 20px;
    }

    .nav-menu {
        gap: 26px;
    }
}

@media (max-width: 960px) {
    .nav-menu {
        gap: 18px;
    }

    .nav-link {
        font-size: 13px;
    }

    .lang-toggle {
        height: 32px;
        min-width: 44px;
        font-size: 12px;
        padding: 0 10px;
    }
}

@media (max-width: 520px) {
    .hero-actions {
        flex-direction: column;
        gap: 12px;
    }

    .btn-primary {
        width: min(280px, 100%);
        min-width: 0;
    }
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 16px 36px;
    background-color: var(--accent-color);
    color: var(--white);
    text-decoration: none;
    font-size: 16px;
    font-weight: 500;
    border-radius: var(--radius-full);
    transition: var(--transition);
    border: 1px solid transparent;
    letter-spacing: 0.5px;
    position: relative;
    overflow: hidden;
    box-shadow: 0 1px 3px rgba(0, 113, 227, 0.2);
    min-height: 48px;
    min-width: 140px;
}

.btn-primary.btn-download {
    background-color: var(--download-color);
    box-shadow: 0 1px 3px rgba(27, 143, 62, 0.22);
}

.btn-primary.btn-download:hover {
    background-color: var(--download-hover-color);
    box-shadow: 0 10px 32px rgba(20, 122, 52, 0.18);
}

.btn-primary.btn-message {
    background-color: var(--message-color);
    box-shadow: 0 1px 3px rgba(124, 58, 237, 0.22);
}

.btn-primary.btn-message:hover {
    background-color: var(--message-hover-color);
    box-shadow: 0 10px 32px rgba(109, 40, 217, 0.18);
}

.btn-primary::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: var(--transition);
}

.btn-primary:hover {
    background-color: #0077ed;
    transform: translateY(-1px);
    box-shadow: 0 4px 16px rgba(0, 113, 227, 0.3);
}

.btn-primary:hover::before {
    left: 100%;
}

.btn-secondary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 16px 36px;
    background-color: rgba(255, 255, 255, 0.95);
    color: var(--accent-color);
    text-decoration: none;
    font-size: 16px;
    font-weight: 600;
    border-radius: var(--radius-full);
    transition: var(--transition);
    border: 1px solid rgba(0, 113, 227, 0.42);
    letter-spacing: 0.5px;
    box-shadow: 0 4px 18px rgba(0, 113, 227, 0.12);
    position: relative;
    overflow: hidden;
    min-height: 48px;
    min-width: 140px;
}

/* 留言弹窗 */
.modal-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.36);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 22px;
    z-index: 1600;
}

.modal-backdrop[hidden] {
    display: none;
}

.modal-card {
    width: min(560px, 100%);
    background: rgba(255, 255, 255, 0.92);
    border: 1px solid rgba(0, 0, 0, 0.08);
    border-radius: 22px;
    box-shadow: 0 24px 80px rgba(0, 0, 0, 0.18);
    backdrop-filter: blur(26px);
    -webkit-backdrop-filter: blur(26px);
    padding: 22px 22px 18px;
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 10px;
}

.modal-title {
    font-size: 20px;
    font-weight: 650;
    letter-spacing: -0.4px;
    color: var(--primary-color);
}

.modal-close {
    width: 38px;
    height: 38px;
    border-radius: 999px;
    border: 1px solid rgba(0, 0, 0, 0.1);
    background: rgba(255, 255, 255, 0.85);
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    flex: 0 0 auto;
}

.modal-close::before,
.modal-close::after {
    content: '';
    position: absolute;
    left: 50%;
    top: 50%;
    width: 16px;
    height: 2px;
    background: rgba(29, 29, 31, 0.72);
    transform-origin: center;
}

.modal-close::before {
    transform: translate(-50%, -50%) rotate(45deg);
}

.modal-close::after {
    transform: translate(-50%, -50%) rotate(-45deg);
}

.modal-close:hover {
    background: rgba(255, 255, 255, 0.98);
    border-color: rgba(0, 113, 227, 0.2);
    transform: translateY(-1px);
}

.modal-subtitle {
    color: var(--secondary-color);
    font-size: 13px;
    line-height: 1.6;
    margin-bottom: 16px;
}

.guestbook-form {
    display: grid;
    gap: 14px;
}

.form-row {
    display: grid;
    gap: 8px;
}

.form-inline {
    margin-top: 2px;
}

.form-label {
    font-size: 13px;
    color: rgba(29, 29, 31, 0.82);
    font-weight: 600;
    letter-spacing: 0.2px;
}

.form-input,
.form-textarea {
    width: 100%;
    border-radius: 14px;
    border: 1px solid rgba(0, 0, 0, 0.12);
    background: rgba(255, 255, 255, 0.9);
    padding: 12px 14px;
    font-size: 14px;
    color: var(--primary-color);
    transition: var(--transition);
}

.form-textarea {
    resize: vertical;
    min-height: 124px;
}

.form-input:focus,
.form-textarea:focus {
    outline: none;
    border-color: rgba(0, 113, 227, 0.45);
    box-shadow: 0 0 0 4px rgba(0, 113, 227, 0.12);
    background: rgba(255, 255, 255, 0.98);
}

.form-check {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-size: 13px;
    color: rgba(29, 29, 31, 0.8);
    cursor: pointer;
    user-select: none;
}

.form-check input {
    width: 16px;
    height: 16px;
}

.form-hp {
    position: absolute;
    left: -9999px;
    width: 1px;
    height: 1px;
    opacity: 0.01;
}

.form-actions {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 12px;
    margin-top: 2px;
}

.form-status {
    min-height: 20px;
    font-size: 13px;
    color: rgba(29, 29, 31, 0.75);
}

.form-status.is-error {
    color: rgba(190, 30, 60, 0.88);
}

.form-status.is-success {
    color: rgba(20, 122, 52, 0.9);
}

.form-hint {
    margin-top: 8px;
    color: rgba(29, 29, 31, 0.62);
    font-size: 12px;
    line-height: 1.5;
}

.form-hint-inline {
    margin-left: 4px;
    color: rgba(29, 29, 31, 0.58);
    font-size: 12px;
    font-weight: 500;
    line-height: 1.4;
}

/* 留言板 */
.guestbook-board {
    padding: 28px 0 84px;
    background: linear-gradient(180deg, rgba(245, 245, 247, 0.55), rgba(255, 255, 255, 0));
}

.guestbook-board .container {
    max-width: 1400px;
}

#guestbook {
    scroll-margin-top: 84px;
}

.guestbook-head {
    display: flex;
    align-items: flex-start;
    justify-content: flex-start;
    gap: 18px;
    margin-bottom: 12px;
}

.guestbook-head-left {
    display: grid;
    grid-template-columns: 1fr;
    grid-template-rows: auto auto;
    align-items: start;
    gap: 12px;
    min-width: 0;
    width: 100%;
    flex: 1 1 auto;
}

.guestbook-title-row {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: nowrap;
    min-width: 0;
    justify-content: flex-start;
}

.guestbook-board-title {
    margin-bottom: 0;
    text-align: left;
    font-size: 1.65rem;
    letter-spacing: -1px;
    line-height: 1.15;
}

.guestbook-head-actions {
    display: flex;
    align-items: center;
    gap: 10px;
}

.segmented {
    display: inline-flex;
    align-items: center;
    border-radius: 999px;
    padding: 4px;
    border: 1px solid rgba(0, 0, 0, 0.1);
    background: rgba(255, 255, 255, 0.82);
    box-shadow: var(--shadow-sm);
}

.segmented-btn {
    height: 36px;
    padding: 0 14px;
    border-radius: 999px;
    border: 1px solid transparent;
    background: transparent;
    cursor: pointer;
    transition: var(--transition);
    font-size: 13px;
    font-weight: 700;
    color: rgba(29, 29, 31, 0.72);
}

.segmented-btn:hover {
    color: var(--accent-color);
    background: rgba(0, 113, 227, 0.08);
}

.segmented-btn.is-active {
    background: rgba(0, 113, 227, 0.14);
    border-color: rgba(0, 113, 227, 0.18);
    color: var(--accent-color);
}

.guestbook-write {
    min-height: 44px;
    padding: 12px 18px;
    border-radius: 999px;
    justify-self: end;
}

.guestbook-board-status {
    min-height: 0;
    margin-bottom: 10px;
    font-size: 13px;
    color: rgba(29, 29, 31, 0.7);
    display: flex;
    align-items: center;
    gap: 10px;
}

.guestbook-board-status[hidden] {
    display: none !important;
}

.guestbook-footer-actions {
    margin-top: 14px;
    margin-bottom: 10px;
    display: flex;
    justify-content: flex-end;
    align-items: center;
}

.guestbook-board-status.is-error {
    color: rgba(190, 30, 60, 0.88);
}

.guestbook-list {
    display: grid;
    gap: 14px;
}

.gb-item {
    border-radius: 18px;
    border: 1px solid rgba(0, 0, 0, 0.08);
    background: rgba(255, 255, 255, 0.9);
    box-shadow: var(--shadow-sm);
    padding: 16px 16px 14px;
}

.gb-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 10px;
    color: rgba(29, 29, 31, 0.55);
    font-size: 12px;
}

.gb-message {
    color: rgba(29, 29, 31, 0.88);
    font-size: 14px;
    line-height: 1.75;
    white-space: pre-wrap;
    word-break: break-word;
}

.gb-actions {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-top: 12px;
    flex-wrap: wrap;
}

.gb-action {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    height: 34px;
    padding: 0 12px;
    border-radius: 999px;
    border: 1px solid rgba(0, 0, 0, 0.1);
    background: rgba(255, 255, 255, 0.88);
    color: rgba(29, 29, 31, 0.8);
    font-size: 12px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.gb-action:hover {
    border-color: rgba(0, 113, 227, 0.25);
    color: var(--accent-color);
    background: rgba(255, 255, 255, 0.98);
}

.gb-action.is-primary:hover {
    border-color: rgba(124, 58, 237, 0.25);
    color: var(--message-color);
}

.gb-like-count {
    font-variant-numeric: tabular-nums;
    opacity: 0.85;
}

.gb-replies {
    margin-top: 12px;
    display: grid;
    gap: 10px;
    padding-left: 14px;
    border-left: 2px solid rgba(0, 0, 0, 0.06);
}

.gb-reply {
    padding: 10px 12px;
    border-radius: 14px;
    background: rgba(245, 245, 247, 0.8);
    border: 1px solid rgba(0, 0, 0, 0.06);
}

.gb-reply .gb-meta {
    margin-bottom: 6px;
}

.guestbook-pager {
    margin-top: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: 12px;
}

.pager-row {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    flex-wrap: wrap;
    width: 100%;
}

.pager-row-tools {
    gap: 12px;
}

.pager-row-main .pager-btn,
.pager-row-main .pager-info {
    flex: 0 0 auto;
    white-space: nowrap;
}

@media (max-width: 640px) {
    /* Keep pagination controls on a single row on mobile; allow horizontal scroll */
    .pager-row-main {
        flex-wrap: nowrap;
        justify-content: center;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        scrollbar-width: none;
        gap: 8px;
        padding: 2px 2px;
        max-width: 100%;
    }

    .pager-row-main::-webkit-scrollbar {
        display: none;
    }

    .pager-btn {
        height: 34px;
        padding: 0 10px;
        font-size: 12px;
        font-weight: 600;
    }

    .pager-info {
        font-size: 12px;
        font-weight: 700;
        padding: 0 4px;
    }

    .pager-input {
        height: 34px;
        font-size: 12px;
        padding: 0 10px;
    }

    .pager-go {
        padding: 0 12px;
    }

    .segmented-btn {
        height: 32px;
        padding: 0 12px;
        font-size: 12px;
    }
}

.pager-info {
    font-size: 13px;
    font-weight: 700;
    color: rgba(29, 29, 31, 0.7);
    padding: 0 6px;
    white-space: nowrap;
}

.pager-jump {
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.pager-input {
    height: 38px;
    border-radius: 999px;
    border: 1px solid rgba(0, 0, 0, 0.12);
    background: rgba(255, 255, 255, 0.92);
    padding: 0 12px;
    font-size: 13px;
    color: rgba(29, 29, 31, 0.8);
    text-align: center;
    width: 8ch;
}

.pager-input:focus {
    outline: none;
    border-color: rgba(0, 113, 227, 0.45);
    box-shadow: 0 0 0 4px rgba(0, 113, 227, 0.12);
}

.pager-go {
    padding: 0 16px;
}

.pager-btn {
    height: 38px;
    padding: 0 14px;
    border-radius: 999px;
    border: 1px solid rgba(0, 0, 0, 0.12);
    background: rgba(255, 255, 255, 0.92);
    cursor: pointer;
    transition: var(--transition);
    font-size: 13px;
    font-weight: 600;
    color: rgba(29, 29, 31, 0.8);
}

.pager-btn:disabled {
    opacity: 0.45;
    cursor: not-allowed;
}

.pager-pages {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
    justify-content: center;
}

.pager-page {
    width: 38px;
    height: 38px;
    border-radius: 999px;
    border: 1px solid rgba(0, 0, 0, 0.12);
    background: rgba(255, 255, 255, 0.92);
    cursor: pointer;
    transition: var(--transition);
    font-size: 13px;
    font-weight: 700;
    color: rgba(29, 29, 31, 0.72);
}

.pager-page.is-active {
    background: rgba(0, 113, 227, 0.12);
    border-color: rgba(0, 113, 227, 0.3);
    color: var(--accent-color);
}

.pager-select {
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.pager-label {
    font-size: 12px;
    color: rgba(29, 29, 31, 0.6);
    font-weight: 600;
}

.pager-select-input {
    height: 38px;
    border-radius: 999px;
    border: 1px solid rgba(0, 0, 0, 0.12);
    background: rgba(255, 255, 255, 0.92);
    padding: 0 12px;
    font-size: 13px;
    color: rgba(29, 29, 31, 0.8);
}

@media (max-width: 520px) {
    .modal-card {
        padding: 18px 16px 16px;
        border-radius: 18px;
    }

    .modal-title {
        font-size: 18px;
    }

    .form-actions {
        flex-direction: column-reverse;
        align-items: stretch;
    }

    .form-actions .btn-secondary,
    .form-actions .btn-primary {
        width: 100%;
        min-width: 0;
    }

    .guestbook-head {
        align-items: flex-start;
        flex-direction: column;
    }

    .guestbook-board-title {
        font-size: 1.95rem;
        letter-spacing: -0.9px;
    }

    .guestbook-pager {
        justify-content: center;
    }
}

.btn-secondary::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(0, 113, 227, 0.14), transparent);
    transition: var(--transition);
}

.btn-secondary:hover {
    background-color: rgba(255, 255, 255, 1);
    transform: translateY(-1px);
    box-shadow: 0 10px 32px rgba(0, 113, 227, 0.16);
    border-color: rgba(0, 113, 227, 0.55);
}

.btn-secondary:hover::before {
    left: 100%;
}

/* 通用部分样式 */
section {
    padding: 100px 0;
}

.section-title {
    font-size: 3.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 70px;
    color: var(--primary-color);
    letter-spacing: -2px;
    font-variant-numeric: lining-nums;
}

/* 插件展示样式 */
.plugins {
    background-color: var(--white);
}

.plugins-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
    gap: 48px;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.plugin-card {
    background-color: var(--white);
    padding: 50px 36px;
    border-radius: var(--radius-lg);
    text-align: center;
    transition: var(--transition-slow);
    border: 1px solid var(--border-color);
    position: relative;
    overflow: hidden;
}

.plugin-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent-color), #00b4d8);
    transform: scaleX(0);
    transition: var(--transition);
}

.plugin-card:hover {
    transform: translateY(-12px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(0, 113, 227, 0.2);
}

.plugin-card:hover::before {
    transform: scaleX(1);
}

.plugin-icon {
    width: 110px;
    height: 110px;
    margin: 0 auto 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--light-gray), #e8e8ed);
    border-radius: 28px;
    color: var(--accent-color);
    transition: var(--transition-slow);
    position: relative;
    z-index: 1;
}

.plugin-icon-img {
    width: 60px;
    height: 60px;
    display: block;
    object-fit: contain;
    transition: filter 0.2s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.plugin-card:hover .plugin-icon {
    background: linear-gradient(135deg, var(--accent-color), #0077ed);
    color: var(--white);
    transform: scale(1.12);
    box-shadow: 0 8px 24px rgba(0, 113, 227, 0.3);
}

.plugin-card:hover .plugin-icon-img {
    filter: brightness(0) invert(1);
}

.plugin-title {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 20px;
    color: var(--primary-color);
    letter-spacing: -0.7px;
    line-height: 1.3;
}

.plugin-description {
    font-size: 1.0625rem;
    color: var(--secondary-color);
    margin-bottom: 30px;
    line-height: 1.7;
    letter-spacing: -0.2px;
}

.plugin-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--accent-color);
    text-decoration: none;
    font-size: 1.0625rem;
    font-weight: 600;
    transition: var(--transition);
    position: relative;
    padding-bottom: 2px;
    letter-spacing: 0.1px;
}

.plugin-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 1.5px;
    background-color: var(--accent-color);
    transform: scaleX(0);
    transition: var(--transition);
    transform-origin: left;
}

.plugin-link:hover {
    color: #0077ed;
}

.plugin-link:hover::after {
    transform: scaleX(1);
}

/* 关于我们样式 */
.about {
    background-color: var(--light-gray);
    position: relative;
    overflow: hidden;
}

.about::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--border-color), transparent);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.about .section-title {
    text-align: left;
    margin-bottom: 40px;
    font-size: 3rem;
}

.about-text p {
    font-size: 1.25rem;
    color: var(--secondary-color);
    margin-bottom: 32px;
    line-height: 1.8;
    letter-spacing: -0.4px;
}

.about-image {
    display: flex;
    align-items: center;
    justify-content: center;
    max-width: 350px;
    width: 100%;
    margin: 0 auto;
}

.about-illustration {
    width: 100%;
    max-width: 350px;
    max-height: 309px;
    height: auto;
    object-fit: contain;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: var(--transition-slow);
    background-color: var(--white);
}

.about-illustration:hover {
    transform: scale(1.03);
    box-shadow: 0 16px 48px rgba(0, 0, 0, 0.12);
}

/* 页脚样式 */
.footer {
    background-color: var(--primary-color);
    color: var(--white);
    padding: 80px 0 40px;
    position: relative;
}

.footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.15), transparent);
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 40px;
    margin-bottom: 40px;
    text-align: center;
}

.footer-info h3 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 12px;
    letter-spacing: -0.8px;
}

.footer-info p {
    color: rgba(255, 255, 255, 0.7);
    font-size: 1.0625rem;
    margin: 0;
}

.footer-links {
    display: flex;
    gap: 40px;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    padding: 0;
    margin: 0;
    list-style: none;
}

.footer-link {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    font-size: 1rem;
    transition: var(--transition);
    font-weight: 400;
    letter-spacing: 0.1px;
}

.footer-link:hover {
    color: var(--white);
}

.footer-copyright {
    text-align: center;
    padding-top: 40px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.9375rem;
    letter-spacing: 0.1px;
}

.footer-beian {
    margin-top: 10px;
}

.beian-link {
    color: rgba(255, 255, 255, 0.55);
    text-decoration: none;
    transition: var(--transition);
}

.beian-link:hover {
    color: rgba(255, 255, 255, 0.85);
    text-decoration: underline;
}

/* 响应式设计 - 苹果风格 */
@media (max-width: 1200px) {
    .plugins-grid {
        gap: 40px;
    }
    
    .about-content {
        gap: 60px;
    }
}

@media (max-width: 992px) {
    .hero-title {
        font-size: 3.5rem;
        letter-spacing: -1.5px;
    }
    
    .hero-subtitle {
        font-size: 1.5rem;
    }
    
    .section-title {
        font-size: 2.75rem;
        margin-bottom: 60px;
    }
    
    .about-content {
        grid-template-columns: 1fr;
        gap: 50px;
    }
    
    .about-image {
        max-width: 350px;
    }
    
    .about .section-title {
        text-align: center;
        font-size: 2.75rem;
    }
    
    .plugins-grid {
        grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
        gap: 36px;
    }
    
    .plugin-card {
        padding: 45px 30px;
    }
}

@media (max-width: 768px) {
    .nav-container {
        height: 44px;
        padding: 0 20px;
    }

    .nav-right {
        gap: 10px;
    }
    
    .nav-menu {
        display: flex;
        position: fixed;
        left: -100%;
        top: 44px;
        flex-direction: column;
        background-color: var(--white);
        width: 100%;
        white-space: normal;
        text-align: center;
        transition: var(--transition-slow);
        box-shadow: 0 12px 24px rgba(0, 0, 0, 0.08);
        padding: 24px 0;
        gap: 24px;
        border-bottom: 1px solid var(--border-color);
    }
    
    .nav-menu.active {
        left: 0;
        animation: slideIn 0.3s ease-out;
    }
    
    @keyframes slideIn {
        from {
            transform: translateX(-100%);
        }
        to {
            transform: translateX(0);
        }
    }
    
    .menu-toggle {
        display: block;
    }
    
    .menu-toggle.active .bar:nth-child(1) {
        transform: translateY(6px) rotate(45deg);
        opacity: 1;
    }
    
    .menu-toggle.active .bar:nth-child(2) {
        opacity: 0;
    }
    
    .menu-toggle.active .bar:nth-child(3) {
        transform: translateY(-6px) rotate(-45deg);
        opacity: 1;
    }
    
    .hero {
        padding: 100px 20px 60px;
    }

    .hero-content {
        gap: 14px;
        margin-top: -12px;
    }

    .hero-logo {
        margin-bottom: 20px;
    }

    .hero-logo-img {
        width: 82px;
        height: 82px;
    }

    .hero-logo::before {
        inset: -14px;
        filter: blur(16px);
    }

    .hero-title {
        font-size: 2.8rem;
        letter-spacing: -1.2px;
    }
    
    .hero-subtitle {
        font-size: 1.375rem;
        margin-bottom: 40px;
    }
    
    .section-title {
        font-size: 2.25rem;
        margin-bottom: 50px;
    }
    
    .plugins-grid {
        grid-template-columns: 1fr;
        gap: 28px;
        padding: 0 20px;
    }
    
    .plugin-card {
        padding: 40px 28px;
    }
    
    .plugin-icon {
        width: 100px;
        height: 100px;
    }
    
    .plugin-title {
        font-size: 1.625rem;
    }
    
    .plugin-description {
        font-size: 1rem;
    }
    
    .about-text p {
        font-size: 1.125rem;
    }
    
    .image-placeholder {
        height: 350px;
    }
    
    .footer-content {
        gap: 36px;
    }
    
    .footer-links {
        gap: 32px;
    }
}

@media (max-width: 576px) {
    .hero {
        padding: 90px 20px 50px;
    }

    .hero-logo-img {
        width: 72px;
        height: 72px;
    }

    .hero-logo::before {
        inset: -12px;
        filter: blur(14px);
    }

    .hero-title {
        font-size: 2.3rem;
        letter-spacing: -1px;
        line-height: 1.1;
    }
    
    .hero-subtitle {
        font-size: 1.25rem;
        margin-bottom: 36px;
        line-height: 1.6;
    }
    
    .btn-primary {
        padding: 14px 28px;
        font-size: 15px;
        min-width: 132px;
    }

    .btn-secondary {
        padding: 14px 28px;
        font-size: 15px;
        min-width: 132px;
    }
    
    section {
        padding: 80px 0;
    }
    
    .section-title {
        font-size: 2rem;
        margin-bottom: 40px;
    }
    
    .about .section-title {
        font-size: 2rem;
    }
    
    .plugin-icon {
        width: 90px;
        height: 90px;
    }
    
    .plugin-title {
        font-size: 1.5rem;
    }
    
    .about-text p {
        font-size: 1rem;
        margin-bottom: 28px;
    }
    
    .image-placeholder {
        height: 300px;
    }
    
    .footer-links {
        gap: 24px;
    }
    
    .footer-info h3 {
        font-size: 1.75rem;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1.125rem;
    }
    
    .section-title {
        font-size: 1.875rem;
    }
    
    .plugin-card {
        padding: 36px 24px;
    }
}

/* 平滑滚动 */
html {
    scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    .plugin-card,
    .hero-content {
        animation: none !important;
        transition: none !important;
    }

    .fade-in-section {
        transition: none !important;
    }
}

/* 滚动条样式 - 苹果风格 */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--medium-gray);
    border-radius: var(--radius-full);
    transition: var(--transition);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--secondary-color);
}

/* 选择文本样式 - 苹果风格 */
::selection {
    background-color: var(--accent-color);
    color: var(--white);
}

::-moz-selection {
    background-color: var(--accent-color);
    color: var(--white);
}

/* 加载动画 - 苹果风格 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(40px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.plugin-card {
    animation: fadeInUp 0.7s ease-out forwards;
    opacity: 0;
}

/* 延迟动画 - 苹果风格 */
.plugin-card:nth-child(1) { animation-delay: 0.1s; }
.plugin-card:nth-child(2) { animation-delay: 0.18s; }
.plugin-card:nth-child(3) { animation-delay: 0.26s; }
.plugin-card:nth-child(4) { animation-delay: 0.34s; }
.plugin-card:nth-child(5) { animation-delay: 0.42s; }
.plugin-card:nth-child(6) { animation-delay: 0.5s; }

/* 滚动动画效果 */
.fade-in-section {
    opacity: 0;
    transform: translateY(50px);
    transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

.fade-in-section.is-visible {
    opacity: 1;
    transform: translateY(0);
}

/* Guestbook title sizing (override .section-title rules above) */
.guestbook-board .section-title.guestbook-board-title {
    font-size: 1.65rem;
    letter-spacing: -0.8px;
    margin: 0;
    text-align: left;
}

/* Hide legacy retry button if any cached markup still has it */
#guestbookRetry,
.guestbook-retry {
    display: none !important;
}

@media (max-width: 768px) {
    .guestbook-board .section-title.guestbook-board-title {
        font-size: 1.45rem;
        letter-spacing: -0.4px;
        margin: 0;
        text-align: left;
    }

    .guestbook-title-row {
        gap: 10px;
    }

    .segmented {
        padding: 3px;
    }

    .segmented-btn {
        height: 32px;
        padding: 0 12px;
        font-size: 12px;
    }
}