/* ===== 7-Zip 官网 - 公共样式 ===== */

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

:root {
  --black: #0a0a0a;
  --dark: #1a1a1a;
  --gray-dark: #2e2e2e;
  --gray: #555;
  --gray-light: #888;
  --border: #e0e0e0;
  --bg-light: #f7f7f7;
  --white: #ffffff;
  --accent: #e63329;
  --accent-hover: #c0261e;
  --font: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --radius: 8px;
  --shadow: 0 4px 24px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 40px rgba(0,0,0,0.13);
  --transition: 0.25s ease;
}

html { scroll-behavior: smooth; font-size: 16px; }
body { font-family: var(--font); color: var(--dark); background: var(--white); line-height: 1.7; }
a { color: inherit; text-decoration: none; transition: color var(--transition); }
img { max-width: 100%; display: block; }
ul { list-style: none; }

/* ---- Layout ---- */
.container { max-width: 1160px; margin: 0 auto; padding: 0 24px; }
.section { padding: 80px 0; }
.section-sm { padding: 56px 0; }

/* ---- Typography ---- */
h1,h2,h3,h4 { line-height: 1.25; font-weight: 700; color: var(--black); }
h1 { font-size: clamp(2rem, 5vw, 3.2rem); }
h2 { font-size: clamp(1.5rem, 3.5vw, 2.2rem); }
h3 { font-size: 1.2rem; }
p { color: var(--gray); }

.section-title { text-align: center; margin-bottom: 12px; }
.section-sub  { text-align: center; max-width: 600px; margin: 0 auto 52px; font-size: 1.05rem; }

/* ---- Buttons ---- */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 13px 30px; border-radius: var(--radius);
  font-size: 1rem; font-weight: 600; cursor: pointer; border: none;
  transition: all var(--transition);
}
.btn-primary { background: var(--accent); color: var(--white); }
.btn-primary:hover { background: var(--accent-hover); transform: translateY(-2px); box-shadow: 0 6px 20px rgba(230,51,41,0.35); }
.btn-outline { background: transparent; color: var(--black); border: 2px solid var(--black); }
.btn-outline:hover { background: var(--black); color: var(--white); }
.btn-lg { padding: 16px 38px; font-size: 1.1rem; }

/* ============================
   NAVBAR
============================= */
.navbar {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,0.96);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.navbar-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 64px;
}
.navbar-logo { display: flex; align-items: center; gap: 10px; }
.navbar-logo img { height: 38px; }
.navbar-logo span { font-size: 1.25rem; font-weight: 800; letter-spacing: -0.5px; color: var(--black); }
.navbar-nav { display: flex; align-items: center; gap: 8px; }
.navbar-nav a {
  padding: 6px 16px; border-radius: 6px; font-size: 0.95rem; font-weight: 500; color: var(--gray);
  transition: all var(--transition);
}
.navbar-nav a:hover, .navbar-nav a.active { color: var(--black); background: var(--bg-light); }
.navbar-cta { margin-left: 8px; }
.hamburger { display: none; flex-direction: column; gap: 5px; cursor: pointer; padding: 8px; }
.hamburger span { width: 22px; height: 2px; background: var(--black); border-radius: 2px; transition: all var(--transition); }

/* ============================
   HERO (首页第1屏)
============================= */
.hero {
  min-height: 88vh; display: flex; align-items: center;
  background: linear-gradient(135deg, #0a0a0a 0%, #1e1e1e 50%, #2e2e2e 100%);
  position: relative; overflow: hidden;
}
.hero::before {
  content: ''; position: absolute; inset: 0;
  background: radial-gradient(ellipse 80% 60% at 60% 40%, rgba(230,51,41,0.12) 0%, transparent 70%);
}
.hero-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; position: relative; z-index: 1; }
.hero-badge {
  display: inline-flex; align-items: center; gap: 6px;
  background: rgba(230,51,41,0.15); border: 1px solid rgba(230,51,41,0.35);
  color: #ff6b63; padding: 6px 14px; border-radius: 20px;
  font-size: 0.82rem; font-weight: 600; letter-spacing: 0.5px;
  margin-bottom: 20px;
}
.hero h1 { color: var(--white); margin-bottom: 20px; }
.hero h1 span { color: var(--accent); }
.hero p { color: rgba(255,255,255,0.65); font-size: 1.15rem; margin-bottom: 36px; max-width: 500px; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }
.hero-stats { display: flex; gap: 32px; margin-top: 48px; }
.hero-stat .num { font-size: 2rem; font-weight: 800; color: var(--white); }
.hero-stat .label { font-size: 0.82rem; color: rgba(255,255,255,0.5); letter-spacing: 0.5px; }

.hero-visual {
  display: flex; flex-direction: column; align-items: center; gap: 20px;
}
.hero-logo-box {
  width: 200px; height: 200px;
  background: var(--white);
  border-radius: 32px;
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 20px 60px rgba(0,0,0,0.5), 0 0 0 1px rgba(255,255,255,0.06);
  animation: float 4s ease-in-out infinite;
}
.hero-logo-box img { width: 160px; }
.hero-tags { display: flex; gap: 10px; flex-wrap: wrap; justify-content: center; }
.hero-tag {
  background: rgba(255,255,255,0.08); border: 1px solid rgba(255,255,255,0.12);
  color: rgba(255,255,255,0.7); padding: 5px 14px; border-radius: 20px; font-size: 0.82rem;
}

@keyframes float {
  0%,100% { transform: translateY(0); }
  50%      { transform: translateY(-12px); }
}

/* ============================
   FEATURES (第2屏)
============================= */
.features { background: var(--bg-light); }
.features-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.feature-card {
  background: var(--white); border-radius: 12px; padding: 32px 28px;
  box-shadow: var(--shadow); transition: all var(--transition);
  border: 1px solid var(--border);
}
.feature-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: transparent; }
.feature-icon {
  width: 52px; height: 52px; border-radius: 12px;
  background: linear-gradient(135deg, var(--black), var(--gray-dark));
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 20px; font-size: 1.5rem;
}
.feature-card h3 { margin-bottom: 10px; font-size: 1.1rem; }
.feature-card p { font-size: 0.92rem; line-height: 1.65; }

/* ============================
   DOWNLOAD CTA (第3屏)
============================= */
.download-cta {
  background: linear-gradient(135deg, var(--black) 0%, #2a2a2a 100%);
  color: var(--white); text-align: center;
}
.download-cta h2 { color: var(--white); margin-bottom: 16px; }
.download-cta p { color: rgba(255,255,255,0.6); font-size: 1.08rem; margin-bottom: 40px; }
.download-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-bottom: 40px; }
.dl-card {
  background: rgba(255,255,255,0.06); border: 1px solid rgba(255,255,255,0.1);
  border-radius: 12px; padding: 28px 20px; text-align: center;
  transition: all var(--transition); cursor: pointer;
}
.dl-card:hover { background: rgba(255,255,255,0.1); border-color: var(--accent); transform: translateY(-3px); }
.dl-card .icon { font-size: 2.2rem; margin-bottom: 12px; }
.dl-card h4 { color: var(--white); margin-bottom: 6px; font-size: 1rem; }
.dl-card .version { color: rgba(255,255,255,0.45); font-size: 0.82rem; }

/* ============================
   FAQ (第4屏)
============================= */
.faq-list { max-width: 800px; margin: 0 auto; display: flex; flex-direction: column; gap: 12px; }
.faq-item { border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; }
.faq-question {
  padding: 18px 24px; font-weight: 600; cursor: pointer;
  display: flex; justify-content: space-between; align-items: center;
  background: var(--white); transition: background var(--transition);
}
.faq-question:hover { background: var(--bg-light); }
.faq-icon { font-size: 1.2rem; transition: transform var(--transition); color: var(--gray); }
.faq-item.open .faq-icon { transform: rotate(45deg); color: var(--accent); }
.faq-answer { display: none; padding: 0 24px 20px; color: var(--gray); line-height: 1.75; font-size: 0.95rem; }
.faq-item.open .faq-answer { display: block; }

/* ============================
   FOOTER
============================= */
.footer { background: var(--black); color: rgba(255,255,255,0.5); }
.footer-top { padding: 56px 0 40px; display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; }
.footer-brand img { height: 36px; margin-bottom: 16px; filter: brightness(0) invert(1); }
.footer-brand p { font-size: 0.9rem; line-height: 1.7; max-width: 280px; }
.footer-col h4 { color: var(--white); font-size: 0.9rem; font-weight: 700; letter-spacing: 0.5px; margin-bottom: 16px; }
.footer-col ul li { margin-bottom: 10px; }
.footer-col ul li a { font-size: 0.88rem; transition: color var(--transition); }
.footer-col ul li a:hover { color: var(--white); }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.08); padding: 20px 0; display: flex; justify-content: space-between; align-items: center; font-size: 0.82rem; }
.footer-bottom a { color: rgba(255,255,255,0.4); }
.footer-bottom a:hover { color: rgba(255,255,255,0.8); }

/* ============================
   PAGE HERO (内页)
============================= */
.page-hero {
  background: linear-gradient(135deg, var(--black), #1e1e1e);
  padding: 80px 0 72px; text-align: center;
}
.page-hero h1 { color: var(--white); margin-bottom: 16px; }
.page-hero p { color: rgba(255,255,255,0.6); font-size: 1.1rem; max-width: 550px; margin: 0 auto; }

/* ============================
   DOWNLOAD PAGE
============================= */
.download-table { width: 100%; border-collapse: collapse; }
.download-table th { background: var(--bg-light); padding: 14px 20px; text-align: left; font-size: 0.85rem; font-weight: 700; letter-spacing: 0.5px; color: var(--gray); border-bottom: 2px solid var(--border); }
.download-table td { padding: 16px 20px; border-bottom: 1px solid var(--border); font-size: 0.95rem; }
.download-table tr:last-child td { border-bottom: none; }
.download-table tr:hover td { background: var(--bg-light); }
.badge { display: inline-block; padding: 3px 10px; border-radius: 20px; font-size: 0.75rem; font-weight: 700; }
.badge-new { background: #e8f5e9; color: #2e7d32; }
.badge-win { background: #e3f2fd; color: #1565c0; }
.badge-linux { background: #fce4ec; color: #c62828; }
.badge-mac { background: #ede7f6; color: #4527a0; }
.dl-btn { display: inline-flex; align-items: center; gap: 6px; background: var(--black); color: var(--white); padding: 7px 16px; border-radius: 6px; font-size: 0.85rem; font-weight: 600; transition: all var(--transition); }
.dl-btn:hover { background: var(--accent); transform: translateY(-1px); }
.version-card { background: var(--bg-light); border-radius: 12px; padding: 28px; margin-bottom: 24px; border: 1px solid var(--border); }
.version-card h3 { margin-bottom: 8px; display: flex; align-items: center; gap: 10px; }
.version-card p { font-size: 0.92rem; margin-bottom: 20px; }

/* ============================
   FEATURES PAGE
============================= */
.features-big-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; }
.features-big-grid.reverse { direction: rtl; }
.features-big-grid.reverse > * { direction: ltr; }
.feature-img-block {
  background: linear-gradient(135deg, #1a1a1a, #0a0a0a);
  border-radius: 20px; padding: 40px;
  display: flex; align-items: center; justify-content: center;
  min-height: 280px;
}
.feature-big-icon { font-size: 5rem; }
.feature-text .tag { display: inline-block; background: rgba(230,51,41,0.1); color: var(--accent); padding: 4px 12px; border-radius: 20px; font-size: 0.78rem; font-weight: 700; letter-spacing: 0.5px; margin-bottom: 14px; }
.feature-text h2 { margin-bottom: 14px; }
.feature-text p { margin-bottom: 20px; }
.feature-list { display: flex; flex-direction: column; gap: 10px; }
.feature-list li { display: flex; align-items: flex-start; gap: 10px; font-size: 0.95rem; color: var(--gray); }
.feature-list li::before { content: '✓'; color: var(--accent); font-weight: 800; flex-shrink: 0; margin-top: 2px; }

/* ============================
   ABOUT PAGE
============================= */
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; }
.about-logo-wrap { text-align: center; }
.about-logo-wrap img { width: 220px; margin: 0 auto 20px; }
.about-logo-wrap .about-version { font-size: 0.9rem; color: var(--gray-light); }
.about-text h2 { margin-bottom: 16px; }
.about-text p { margin-bottom: 14px; font-size: 0.96rem; }
.about-meta { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 24px; }
.about-meta-item { background: var(--bg-light); padding: 16px 20px; border-radius: var(--radius); }
.about-meta-item .key { font-size: 0.78rem; font-weight: 700; letter-spacing: 0.5px; color: var(--gray-light); margin-bottom: 4px; }
.about-meta-item .val { font-size: 0.95rem; font-weight: 600; color: var(--black); }
.timeline { position: relative; padding-left: 32px; }
.timeline::before { content: ''; position: absolute; left: 0; top: 8px; bottom: 8px; width: 2px; background: var(--border); }
.timeline-item { position: relative; margin-bottom: 32px; }
.timeline-item::before { content: ''; position: absolute; left: -37px; top: 5px; width: 12px; height: 12px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 0 3px rgba(230,51,41,0.2); }
.timeline-item .year { font-size: 0.8rem; font-weight: 700; color: var(--accent); margin-bottom: 4px; }
.timeline-item h4 { margin-bottom: 4px; font-size: 0.98rem; }
.timeline-item p { font-size: 0.88rem; }

/* ============================
   DOWNLOAD MODAL & QR CODE
============================= */
/* 模态遮罩 */
.dl-modal-mask {
  display: none;
  position: fixed; inset: 0; z-index: 10000;
  background: rgba(0,0,0,0.55);
  align-items: center; justify-content: center;
  padding: 20px;
  animation: fadeIn 0.2s ease;
}
.dl-modal-mask.active { display: flex; }

/* 模态弹窗 */
.dl-modal-box {
  background: #fff; border-radius: 16px;
  max-width: 440px; width: 100%;
  padding: 32px 28px 28px;
  box-shadow: 0 24px 64px rgba(0,0,0,0.25);
  position: relative;
  animation: slideUp 0.3s ease;
}
.dl-modal-close {
  position: absolute; top: 14px; right: 14px;
  width: 32px; height: 32px; border-radius: 50%;
  border: none; background: #f0f0f0; cursor: pointer;
  font-size: 1.1rem; color: #888;
  display: flex; align-items: center; justify-content: center;
  transition: all 0.2s;
}
.dl-modal-close:hover { background: #e0e0e0; color: #333; }

/* 弹窗标题 */
.dl-modal-title {
  font-size: 1.2rem; font-weight: 700; color: var(--black);
  margin-bottom: 6px; padding-right: 30px;
}
.dl-modal-subtitle {
  font-size: 0.88rem; color: var(--gray); margin-bottom: 20px;
}

/* 二维码容器（闪烁边框） */
.qr-wrap {
  display: flex; justify-content: center; margin-bottom: 16px;
}
.qr-frame {
  padding: 10px;
  border-radius: 12px;
  background: #fff;
  border: 3px solid var(--accent);
  animation: qrGlow 2.5s ease-in-out infinite;
  display: inline-block;
}
.qr-frame img {
  display: block;
  width: 150px; height: 150px;
  border-radius: 4px;
}

/* 扫码提示 */
.qr-tip {
  text-align: center;
  font-size: 0.9rem; color: var(--gray);
  margin-bottom: 6px;
}
.qr-tip strong { color: var(--black); }

/* 资源特性列表 */
.dl-modal-features {
  margin: 16px 0 20px;
  padding: 14px 16px;
  background: var(--bg-light);
  border-radius: 10px;
  display: flex; flex-direction: column; gap: 8px;
}
.dl-modal-features li {
  display: flex; align-items: flex-start; gap: 8px;
  font-size: 0.85rem; color: var(--gray);
}
.dl-modal-features li::before {
  content: '✓';
  color: #2e7d32; font-weight: 800;
  flex-shrink: 0; margin-top: 1px;
}

/* 时效性警告 */
.dl-modal-warn {
  font-size: 0.82rem;
  color: #e65100;
  background: #fff3e0;
  border-radius: 8px;
  padding: 10px 14px;
  margin-bottom: 18px;
  display: flex; align-items: flex-start; gap: 6px;
  line-height: 1.5;
}

/* 弹窗底部按钮 */
.dl-modal-actions {
  display: flex; flex-direction: column; gap: 10px;
}
.dl-modal-actions .btn-dl-direct {
  display: flex; align-items: center; justify-content: center; gap: 8px;
  padding: 14px 24px; border-radius: var(--radius);
  font-size: 0.95rem; font-weight: 600;
  border: 2px solid var(--accent); color: var(--accent);
  background: transparent; cursor: pointer;
  transition: all 0.2s;
}
.dl-modal-actions .btn-dl-direct:hover {
  background: var(--accent); color: #fff;
}

/* 页面内嵌二维码区域 */
.inline-qr-section {
  display: flex; align-items: center; justify-content: center;
  gap: 24px; flex-wrap: wrap;
  margin-top: 24px; padding: 24px 20px;
  background: linear-gradient(135deg, #fafafa, #f0f0f0);
  border-radius: 12px;
  border: 1px solid var(--border);
}
.inline-qr-item {
  text-align: center;
  flex: 0 0 auto;
}
.inline-qr-item .qr-label {
  font-size: 0.85rem; font-weight: 600;
  color: var(--black); margin-bottom: 10px;
}
.inline-qr-item .qr-frame img {
  width: 140px; height: 140px;
}
.inline-qr-item .qr-desc {
  font-size: 0.8rem; color: var(--gray);
  margin-top: 8px; line-height: 1.5;
}

/* 动画关键帧 */
@keyframes fadeIn {
  from { opacity: 0; } to { opacity: 1; }
}
@keyframes slideUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes qrGlow {
  0%, 100% {
    border-color: var(--accent);
    box-shadow: 0 0 8px rgba(230,51,41,0.2);
  }
  50% {
    border-color: #ff6b63;
    box-shadow: 0 0 18px rgba(230,51,41,0.45);
  }
}

/* 响应式 - 弹窗 */
@media (max-width: 500px) {
  .dl-modal-box { padding: 24px 18px 20px; }
  .dl-modal-title { font-size: 1.1rem; }
  .qr-frame img { width: 130px; height: 130px; }
  .inline-qr-item .qr-frame img { width: 120px; height: 120px; }
  .inline-qr-section { flex-direction: column; gap: 20px; }
}

/* ============================
   RESPONSIVE
============================= */
@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; text-align: center; }
  .hero p { margin-left: auto; margin-right: auto; }
  .hero-actions { justify-content: center; }
  .hero-stats { justify-content: center; }
  .hero-visual { display: none; }
  .features-grid { grid-template-columns: 1fr 1fr; }
  .download-cards { grid-template-columns: 1fr; max-width: 360px; margin-left: auto; margin-right: auto; }
  .footer-top { grid-template-columns: 1fr 1fr; }
  .features-big-grid, .about-grid { grid-template-columns: 1fr; }
  .features-big-grid.reverse { direction: ltr; }
}
@media (max-width: 600px) {
  .features-grid { grid-template-columns: 1fr; }
  .footer-top { grid-template-columns: 1fr; }
  .navbar-nav, .navbar-cta { display: none; }
  .hamburger { display: flex; }
  .about-meta { grid-template-columns: 1fr; }
  .download-table { font-size: 0.85rem; }
  .download-table td, .download-table th { padding: 12px 10px; }
  h1 { font-size: 1.8rem; }
}