:root{--bg-main: #0A0E1A;--bg-card: #111827;--cyan: #06B6D4;--purple: #8B5CF6;--amber: #F59E0B;--text-main: #E2E8F0;--text-dim: #94A3B8;--font-serif: "Instrument Serif", serif;--font-title: "Space Grotesk", "JetBrains Mono", sans-serif;--font-sans: "Noto Sans SC", "Inter", sans-serif;--font-logo: "Caveat", cursive;--font-mono: "Fira Code", "JetBrains Mono", monospace}*{margin:0;padding:0;box-sizing:border-box;scroll-behavior:smooth}body{background-color:var(--bg-main);color:var(--text-main);font-family:var(--font-sans);line-height:1.6;-webkit-font-smoothing:antialiased}.container{max-width:1100px;margin:0 auto;padding:0 1.5rem}nav{position:fixed;top:0;left:0;width:100%;display:flex;justify-content:space-between;align-items:center;padding:1.2rem 0;z-index:1000;transition:all .3s ease;background-color:transparent}nav.scrolled{background-color:#0a0e1ad9;backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);border-bottom:1px solid rgba(255,255,255,.08)}.logo{font-family:var(--font-title);font-size:1.5rem;font-weight:700;text-decoration:none;color:#fff;display:flex;align-items:baseline;gap:.6rem}.logo .slogan{font-family:var(--font-logo);font-size:1.2rem;color:var(--cyan);font-weight:400;text-transform:lowercase}main{padding-top:80px;min-height:80vh}.home-container main{padding-top:0}.hero{min-height:100vh;display:flex;flex-direction:column;justify-content:center;align-items:center;text-align:center;padding:0}.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:2.5rem}.card{background:var(--bg-card);padding:2.2rem;border-radius:12px;border-left:4px solid transparent;transition:all .3s ease;height:100%;display:flex;flex-direction:column}.nav-links{display:flex;gap:2.5rem;align-items:center}.nav-links a{text-decoration:none;color:var(--text-dim);font-size:.95rem;transition:color .3s}.nav-links a:hover{color:var(--cyan)}.lang-toggle{display:flex;background:#ffffff08;padding:.25rem;border-radius:50px;border:1px solid rgba(255,255,255,.05)}.lang-btn{padding:.3rem .8rem;border-radius:50px;border:none;background:transparent;cursor:pointer;font-size:.8rem;color:var(--text-dim);transition:all .3s}.lang-btn.active{color:var(--cyan);background:#06b6d41a}.hero{min-height:100vh;display:flex;flex-direction:column;justify-content:center;align-items:center;text-align:center;position:relative;overflow:hidden}.hero-quote{font-family:var(--font-serif);font-size:3.5rem;line-height:1.1;color:#fff;max-width:800px;margin-bottom:2rem}.hero-cite{color:var(--text-dim);font-size:.9rem;text-transform:uppercase;letter-spacing:2px;margin-bottom:4rem}.brand-title{font-family:var(--font-title);font-size:1.2rem;letter-spacing:4px;margin-bottom:3rem;display:flex;gap:1rem}.brand-ai{color:var(--purple)}.brand-surf{color:var(--cyan)}.cta-group{display:flex;gap:1.5rem}.btn{padding:1rem 2rem;border-radius:8px;text-decoration:none;font-weight:600;transition:all .3s;font-family:var(--font-title);letter-spacing:1px}.btn-ai{background:var(--purple);color:#fff}.btn-ai:hover{box-shadow:0 0 30px #8b5cf680;transform:translateY(-2px)}.btn-surf{border:1px solid var(--cyan);color:var(--cyan)}.btn-surf:hover{background:#06b6d41a;box-shadow:0 0 30px #06b6d44d;transform:translateY(-2px)}.section-header{margin-bottom:4rem;border-bottom:1px solid rgba(255,255,255,.05);padding-bottom:1rem;display:flex;justify-content:space-between}.card{background:var(--bg-card);padding:2.5rem;border-radius:12px;border-left:4px solid transparent;transition:all .3s;height:100%}.card:hover{background:#1b2436;transform:translateY(-5px)}.card-ai{border-left-color:var(--purple)}.card-ai:hover{box-shadow:0 0 25px #8b5cf626}.card-surf{border-left-color:var(--cyan)}.card-surf:hover{box-shadow:0 0 25px #06b6d426}.tag{font-size:.75rem;padding:.3rem .6rem;border-radius:4px;text-transform:uppercase;letter-spacing:1px}.tag-ai{background:#8b5cf61a;color:var(--purple)}.tag-surf{background:#06b6d41a;color:var(--cyan)}.dialogue-box{background:#ffffff05;padding:2.5rem 3rem;border-radius:16px;margin:4rem 0;position:relative;border:1px solid rgba(255,255,255,.03)}.bubble{max-width:500px;margin-bottom:2rem}.quote-en{font-family:var(--font-serif);font-size:1.6rem;color:#fff;line-height:1.3}.quote-zh{color:var(--text-dim);font-size:.9rem;margin-top:.6rem}.form-group{margin-bottom:1.5rem}.form-label{display:block;color:var(--text-dim);font-size:.85rem;margin-bottom:.5rem;text-transform:uppercase;letter-spacing:1px}.form-input,.form-textarea{width:100%;background:#ffffff08;border:1px solid rgba(255,255,255,.1);padding:.8rem 1rem;color:#fff;border-radius:8px;font-family:var(--font-sans);transition:border-color .3s}.form-input:focus,.form-textarea:focus{outline:none;border-color:var(--cyan);background:#06b6d40d}footer{padding:6rem 0;border-top:1px solid rgba(255,255,255,.05);text-align:center}