/* Aqua Flow / Productivity Stream Theme */
:root {
  --c-bg: #f0fdfa;
  --c-surface: #ffffff;
  --c-surface-hover: #f8fafc;
  --c-text: #1e293b;
  --c-text-light: #475569;
  --c-primary: #0f766e;
  --c-primary-light: #14b8a6;
  --c-accent: #0ea5e9;
  --c-border: #ccfbf1;
  --font-base: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
  --shadow-soft: 0 10px 40px -10px rgba(20, 184, 166, 0.15);
  --shadow-hover: 0 20px 40px -10px rgba(14, 165, 233, 0.2);
  --radius-lg: 32px;
  --radius-md: 16px;
  --radius-sm: 8px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: var(--font-base); background-color: var(--c-bg); color: var(--c-text); line-height: 1.6; overflow-x: hidden; -webkit-font-smoothing: antialiased; }
@keyframes spin { from { transform: rotate(0deg); } to { transform: rotate(360deg); } }
@keyframes float { 0% { transform: translateY(0); } 50% { transform: translateY(-15px); } 100% { transform: translateY(0); } }
@keyframes fadeIn { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }

.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.nav { position: fixed; top: 0; left: 0; right: 0; z-index: 100; background: rgba(255, 255, 255, 0.85); backdrop-filter: blur(12px); border-bottom: 1px solid var(--c-border); padding: 16px 0; }
.nav-inner { display: flex; justify-content: space-between; align-items: center; }
.nav-brand { display: flex; align-items: center; gap: 12px; text-decoration: none; color: var(--c-primary); font-weight: 700; font-size: 1.25rem; }
.nav-brand svg { width: 32px; height: 32px; fill: var(--c-primary-light); }
.nav-menu { display: flex; gap: 8px; }
.nav-link { text-decoration: none; color: var(--c-text-light); font-weight: 500; padding: 8px 16px; border-radius: 999px; transition: var(--transition); }
.nav-link:hover { color: var(--c-primary); background: rgba(20, 184, 166, 0.1); }
.nav-link.active { color: #fff; background: linear-gradient(135deg, var(--c-primary-light), var(--c-accent)); box-shadow: 0 4px 12px rgba(20,184,166,0.3); }

.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; border: none; cursor: pointer; font-family: inherit; font-weight: 600; transition: var(--transition); border-radius: 999px; text-decoration: none; }
.btn:disabled { opacity: 0.7; cursor: not-allowed; }
.btn-primary { background: linear-gradient(135deg, var(--c-primary), var(--c-primary-light)); color: #fff; padding: 14px 32px; font-size: 1.125rem; box-shadow: var(--shadow-soft); }
.btn-primary:hover:not(:disabled) { transform: translateY(-2px); box-shadow: var(--shadow-hover); }
.btn-outline { background: transparent; border: 2px solid var(--c-primary-light); color: var(--c-primary); padding: 12px 28px; }
.btn-outline:hover:not(:disabled) { background: rgba(20, 184, 166, 0.1); }
.btn-sm { padding: 8px 16px; font-size: 0.875rem; }
.btn-block { width: 100%; }

.hero { padding: 160px 0 80px; text-align: center; position: relative; overflow: hidden; }
.hero::before { content: ""; position: absolute; top: -100px; left: 50%; transform: translateX(-50%); width: 800px; height: 800px; background: radial-gradient(circle, rgba(14,165,233,0.1) 0%, rgba(20,184,166,0) 70%); z-index: -1; border-radius: 50%; }
.hero-tag { display: inline-block; padding: 6px 16px; border-radius: 999px; background: rgba(20, 184, 166, 0.15); color: var(--c-primary); font-size: 0.875rem; font-weight: 600; margin-bottom: 24px; animation: fadeIn 0.6s ease-out; }
.hero-title { font-size: 4rem; font-weight: 800; color: var(--c-text); line-height: 1.1; margin-bottom: 24px; letter-spacing: -0.02em; animation: fadeIn 0.8s ease-out; }
.hero-title span { background: linear-gradient(135deg, var(--c-primary), var(--c-accent)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.hero-desc { font-size: 1.25rem; color: var(--c-text-light); max-width: 600px; margin: 0 auto 40px; animation: fadeIn 1s ease-out; }
.hero-actions { display: flex; gap: 16px; justify-content: center; animation: fadeIn 1.2s ease-out; flex-wrap: wrap; }
.hero-visual { margin-top: 60px; position: relative; animation: fadeIn 1.4s ease-out; }
.hero-img-box { background: var(--c-surface); border-radius: var(--radius-lg); padding: 24px; box-shadow: var(--shadow-soft); max-width: 900px; margin: 0 auto; border: 1px solid var(--c-border); position: relative; }
.hero-img-box svg { width: 100%; height: auto; border-radius: var(--radius-md); animation: float 6s ease-in-out infinite; }

.stats-bar { display: flex; justify-content: center; gap: 80px; padding: 40px 0; background: var(--c-surface); border-top: 1px solid var(--c-border); border-bottom: 1px solid var(--c-border); flex-wrap: wrap; margin-bottom: -100px; position: relative; z-index: 10; }
.stat-item { text-align: center; }
.stat-num { font-size: 2.5rem; font-weight: 800; color: var(--c-primary); margin-bottom: 4px; }
.stat-lbl { color: var(--c-text-light); font-weight: 500; }

.sec { padding: 100px 0; }
.sec-alt { background: #fff; }
.sec-head { text-align: center; margin-bottom: 60px; max-width: 600px; margin-left: auto; margin-right: auto; }
.sec-title { font-size: 2.5rem; font-weight: 700; margin-bottom: 16px; }
.sec-desc { color: var(--c-text-light); font-size: 1.125rem; }

.feat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 32px; }
.feat-card { background: var(--c-surface); border-radius: var(--radius-lg); padding: 40px; box-shadow: var(--shadow-soft); transition: var(--transition); border: 1px solid var(--c-border); text-align: center; }
.feat-card:hover { transform: translateY(-10px); box-shadow: var(--shadow-hover); border-color: var(--c-primary-light); }
.feat-icon { width: 64px; height: 64px; margin: 0 auto 24px; display: flex; align-items: center; justify-content: center; background: rgba(20, 184, 166, 0.1); border-radius: 50%; color: var(--c-primary); }
.feat-icon svg { width: 32px; height: 32px; fill: currentColor; }
.feat-title { font-size: 1.5rem; font-weight: 700; margin-bottom: 12px; color: var(--c-text); }
.feat-text { color: var(--c-text-light); }

.deep-row { display: flex; align-items: center; gap: 60px; margin-bottom: 100px; }
.deep-row:last-child { margin-bottom: 0; }
.deep-row.rev { flex-direction: row-reverse; }
.deep-content { flex: 1; }
.deep-tag { display: inline-block; padding: 4px 12px; border-radius: 6px; background: rgba(14, 165, 233, 0.1); color: var(--c-accent); font-size: 0.875rem; font-weight: 600; margin-bottom: 16px; }
.deep-title { font-size: 2.5rem; font-weight: 700; margin-bottom: 24px; line-height: 1.2; }
.deep-text { color: var(--c-text-light); font-size: 1.125rem; margin-bottom: 24px; }
.deep-list { list-style: none; margin-bottom: 32px; }
.deep-list li { display: flex; align-items: center; gap: 12px; margin-bottom: 12px; color: var(--c-text); font-weight: 500; }
.deep-list li svg { width: 24px; height: 24px; color: var(--c-primary-light); flex-shrink: 0; }
.deep-visual { flex: 1; background: var(--c-surface); border-radius: var(--radius-lg); padding: 40px; box-shadow: var(--shadow-soft); border: 1px solid var(--c-border); display: flex; justify-content: center; align-items: center; }
.deep-visual svg { width: 100%; max-width: 400px; height: auto; }

.plat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 24px; }
.plat-card { background: var(--c-surface); border-radius: var(--radius-md); padding: 32px; box-shadow: var(--shadow-soft); border: 1px solid var(--c-border); transition: var(--transition); text-align: center; }
.plat-card:hover { border-color: var(--c-primary-light); transform: translateY(-5px); }
.plat-ico { width: 48px; height: 48px; margin: 0 auto 16px; color: var(--c-primary); }
.plat-name { font-size: 1.25rem; font-weight: 700; margin-bottom: 8px; }
.plat-req { color: var(--c-text-light); font-size: 0.875rem; margin-bottom: 24px; }

.reviews-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 24px; }
.rev-card { background: var(--c-surface); border-radius: var(--radius-md); padding: 32px; box-shadow: var(--shadow-soft); border: 1px solid var(--c-border); transition: var(--transition); }
.rev-card:hover { transform: translateY(-5px); border-color: var(--c-primary-light); }
.rev-stars { color: #f59e0b; margin-bottom: 16px; }
.rev-text { font-size: 1.125rem; font-style: italic; margin-bottom: 24px; color: var(--c-text); line-height: 1.6; }
.rev-author { display: flex; align-items: center; gap: 12px; }
.rev-avatar { width: 48px; height: 48px; border-radius: 50%; background: linear-gradient(135deg, var(--c-primary-light), var(--c-accent)); color: #fff; display: flex; align-items: center; justify-content: center; font-weight: 700; font-size: 1.25rem; }
.rev-info h4 { font-size: 1rem; margin-bottom: 2px; color: var(--c-text); }
.rev-info p { font-size: 0.875rem; color: var(--c-text-light); }

.cmp-table { width: 100%; border-collapse: collapse; margin: 40px 0; background: #fff; border-radius: var(--radius-md); overflow: hidden; box-shadow: var(--shadow-soft); border: 1px solid var(--c-border); }
.cmp-table th, .cmp-table td { padding: 16px 24px; text-align: center; border-bottom: 1px solid var(--c-border); }
.cmp-table th { background: var(--c-bg); font-weight: 700; color: var(--c-text); text-align: left; }
.cmp-table th:not(:first-child) { text-align: center; }
.cmp-table td:first-child { text-align: left; font-weight: 500; }
.cmp-table tr:last-child td { border-bottom: none; }
.cmp-check { color: var(--c-primary-light); width: 24px; height: 24px; }
.cmp-cross { color: #ef4444; width: 24px; height: 24px; }

.faq-list { max-width: 800px; margin: 0 auto; display: flex; flex-direction: column; gap: 16px; }
.faq-item { background: var(--c-surface); border-radius: var(--radius-md); border: 1px solid var(--c-border); overflow: hidden; transition: var(--transition); box-shadow: var(--shadow-soft); }
.faq-q { padding: 24px; cursor: pointer; display: flex; justify-content: space-between; align-items: center; font-weight: 600; font-size: 1.125rem; user-select: none; }
.faq-q:hover { background: rgba(20, 184, 166, 0.05); }
.faq-icon { width: 24px; height: 24px; transition: transform 0.3s ease; color: var(--c-primary-light); }
.faq-item.active .faq-icon { transform: rotate(180deg); }
.faq-a { max-height: 0; overflow: hidden; transition: max-height 0.4s ease; background: #fff; }
.faq-a-inner { padding: 0 24px 24px; color: var(--c-text-light); }

.dl-hero { padding: 140px 0 60px; text-align: center; }
.dl-main-box { background: #fff; border-radius: var(--radius-lg); padding: 60px 40px; box-shadow: 0 20px 60px -15px rgba(15, 118, 110, 0.15); max-width: 800px; margin: 0 auto 40px; position: relative; border: 2px solid var(--c-border); }
.dl-main-box::before { content: ""; position: absolute; top: 0; left: 0; right: 0; height: 8px; background: linear-gradient(90deg, var(--c-primary), var(--c-accent)); border-radius: var(--radius-lg) var(--radius-lg) 0 0; }
.dl-icon { width: 80px; height: 80px; color: var(--c-primary); margin: 0 auto 24px; }
.dl-title { font-size: 2rem; font-weight: 800; margin-bottom: 12px; }
.dl-meta { display: flex; justify-content: center; gap: 24px; color: var(--c-text-light); margin-bottom: 32px; font-size: 0.875rem; flex-wrap: wrap; }
.dl-meta span { display: flex; align-items: center; gap: 6px; }
.dl-meta svg { width: 16px; height: 16px; }

.steps-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 24px; margin-top: 40px; }
.step-card { background: var(--c-bg); border-radius: var(--radius-md); padding: 24px; text-align: left; position: relative; border: 1px solid var(--c-border); }
.step-num { position: absolute; top: -16px; left: 24px; width: 32px; height: 32px; background: var(--c-primary-light); color: #fff; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-weight: 700; box-shadow: var(--shadow-soft); }
.step-title { font-size: 1.125rem; font-weight: 700; margin: 12px 0 8px; }
.step-text { color: var(--c-text-light); font-size: 0.875rem; }

.req-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 24px; margin-top: 24px; }
.req-card { background: var(--c-surface); padding: 24px; border-radius: var(--radius-md); border: 1px solid var(--c-border); box-shadow: var(--shadow-soft); text-align: center; }
.req-card h4 { color: var(--c-primary); margin-bottom: 8px; font-size: 1.125rem; }
.req-card p { color: var(--c-text-light); font-size: 0.875rem; }

.ver-list { border-left: 2px solid var(--c-primary-light); padding-left: 32px; margin: 40px auto; max-width: 800px; }
.ver-item { position: relative; margin-bottom: 40px; background: var(--c-surface); padding: 24px; border-radius: var(--radius-md); border: 1px solid var(--c-border); box-shadow: var(--shadow-soft); }
.ver-dot { position: absolute; left: -41px; top: 24px; width: 16px; height: 16px; border-radius: 50%; background: var(--c-primary); border: 4px solid var(--c-bg); }
.ver-date { font-size: 0.875rem; color: var(--c-primary-light); font-weight: 600; margin-bottom: 8px; display: block; }
.ver-title { font-size: 1.25rem; font-weight: 700; margin-bottom: 12px; }
.ver-desc { color: var(--c-text-light); }
.ver-desc ul { margin-left: 20px; margin-top: 8px; }
.ver-desc li { margin-bottom: 4px; }

.article-wrap { display: grid; grid-template-columns: 1fr 320px; gap: 40px; margin-top: 40px; }
.article-main { background: #fff; border-radius: var(--radius-lg); padding: 60px; box-shadow: var(--shadow-soft); border: 1px solid var(--c-border); }
.article-main h1 { font-size: 2.5rem; margin-bottom: 24px; color: var(--c-primary); line-height: 1.3; }
.article-main h2 { font-size: 1.75rem; margin: 40px 0 20px; color: var(--c-text); border-bottom: 2px solid var(--c-bg); padding-bottom: 12px; }
.article-main h3 { font-size: 1.25rem; margin: 24px 0 12px; color: var(--c-text); }
.article-main p { font-size: 1.125rem; color: var(--c-text-light); margin-bottom: 24px; }
.article-main ul, .article-main ol { margin: 0 0 24px 24px; color: var(--c-text-light); }
.article-main li { margin-bottom: 12px; font-size: 1.125rem; }
.article-main blockquote { border-left: 4px solid var(--c-primary-light); padding-left: 16px; font-style: italic; color: var(--c-text); margin: 24px 0; background: var(--c-bg); padding: 16px; border-radius: 0 var(--radius-sm) var(--radius-sm) 0; }
.article-sidebar { position: sticky; top: 100px; }
.side-box { background: #fff; border-radius: var(--radius-md); padding: 24px; box-shadow: var(--shadow-soft); border: 1px solid var(--c-border); margin-bottom: 24px; }
.side-box-title { font-size: 1.25rem; font-weight: 700; margin-bottom: 16px; color: var(--c-primary); }
.side-dl-list { display: flex; flex-direction: column; gap: 12px; }
.toc-list { list-style: none; margin: 0; padding: 0; }
.toc-list li { margin-bottom: 12px; }
.toc-list a { color: var(--c-text-light); text-decoration: none; transition: var(--transition); display: block; border-left: 2px solid transparent; padding-left: 12px; }
.toc-list a:hover { color: var(--c-primary); border-left-color: var(--c-primary-light); }

.cta-block { text-align: center; background: linear-gradient(135deg, var(--c-primary), var(--c-accent)); border-radius: var(--radius-lg); padding: 60px 40px; color: #fff; margin: 60px 0; box-shadow: var(--shadow-hover); position: relative; overflow: hidden; }
.cta-block::after { content: ""; position: absolute; right: -50px; bottom: -50px; width: 200px; height: 200px; background: rgba(255,255,255,0.1); border-radius: 50%; }
.cta-title { font-size: 2.5rem; font-weight: 700; margin-bottom: 16px; }
.cta-desc { font-size: 1.25rem; opacity: 0.9; margin-bottom: 32px; }
.cta-btn { background: #fff; color: var(--c-primary); padding: 18px 48px; font-size: 1.25rem; font-weight: 700; border-radius: 999px; box-shadow: 0 10px 25px rgba(0,0,0,0.15); border: none; cursor: pointer; transition: all 0.3s ease; }
.cta-btn:hover:not(:disabled) { background: var(--c-bg); color: var(--c-primary); transform: translateY(-3px); box-shadow: 0 15px 30px rgba(0,0,0,0.2); }

.footer { background: var(--c-text); color: #94a3b8; padding: 60px 0 40px; text-align: center; margin-top: auto; }
.footer-logo { display: inline-flex; align-items: center; gap: 8px; color: #fff; font-size: 1.5rem; font-weight: 700; margin-bottom: 24px; }
.footer-logo svg { width: 32px; height: 32px; fill: var(--c-primary-light); }
.security-badge { display: inline-flex; align-items: center; gap: 8px; background: rgba(20, 184, 166, 0.1); padding: 12px 24px; border-radius: 999px; color: var(--c-primary-light); font-weight: 600; margin-bottom: 32px; border: 1px solid rgba(20, 184, 166, 0.2); }
.security-badge svg { width: 20px; height: 20px; }
.footer-text { font-size: 0.875rem; line-height: 1.8; max-width: 600px; margin: 0 auto; opacity: 0.8; }

@media (max-width: 1024px) {
  .hero-title { font-size: 3rem; }
  .article-wrap { grid-template-columns: 1fr; }
  .article-sidebar { position: static; display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
  .stats-bar { margin-bottom: 40px; gap: 40px; }
}
@media (max-width: 768px) {
  .nav-menu { display: none; }
  .hero { padding: 120px 0 60px; }
  .hero-title { font-size: 2.5rem; }
  .deep-row, .deep-row.rev { flex-direction: column; text-align: center; gap: 40px; }
  .deep-list li { justify-content: center; }
  .dl-main-box { padding: 40px 24px; }
  .article-main { padding: 32px 24px; }
  .article-sidebar { grid-template-columns: 1fr; }
  .cmp-table { display: block; overflow-x: auto; }
}