*,
        *::before,
        *::after {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        :root {
            --deep-950: #060f1f;
            --deep-900: #0a1929;
            --deep-800: #0f2440;
            --deep-700: #132f56;
            --deep-600: #1a3f6e;
            --deep-500: #1e5090;
            --deep-400: #2563aa;
            --deep-350: #2f72c4;
            --deep-300: #4a8ed6;
            --deep-200: #7ab0e8;
            --deep-150: #a8cff5;
            --deep-100: #d4e8fa;
            --deep-50: #eaf4fd;
            --deep-25: #f5f9fd;
            --teal-600: #0d6e6e;
            --teal-500: #0e8c8c;
            --teal-400: #0ea5a5;
            --teal-350: #14b8b8;
            --teal-300: #2dd4c4;
            --teal-200: #5eeadb;
            --teal-100: #a7f7f0;
            --teal-50: #e0fcf8;
            --amber-400: #e8990f;
            --amber-300: #f5b642;
            --gray-bg: #f8fafb;
            --gray-100: #f1f5f8;
            --gray-200: #e2e8f0;
            --gray-300: #cbd5e1;
            --gray-400: #94a3b8;
            --gray-500: #64748b;
            --text-primary: #0f1a2e;
            --text-secondary: #1a2d47;
            --text-tertiary: #2c3f5a;
            --text-muted: #52647a;
            --white: #ffffff;
            --shadow-xs: 0 1px 2px rgba(10, 25, 45, 0.04);
            --shadow-sm: 0 1px 3px rgba(10, 25, 45, 0.06);
            --shadow-md: 0 4px 20px rgba(10, 25, 45, 0.07);
            --shadow-lg: 0 20px 40px -12px rgba(30, 80, 144, 0.16);
            --shadow-card: 0 2px 6px rgba(10, 25, 45, 0.03), 0 10px 28px rgba(10, 25, 45, 0.05);
            --shadow-card-hover: 0 4px 12px rgba(10, 25, 45, 0.04), 0 18px 40px rgba(30, 80, 144, 0.10);
            --radius-sm: 14px;
            --radius-md: 18px;
            --radius-lg: 24px;
            --radius-xl: 36px;
            --radius-full: 50%;
            --font-mono: 'SF Mono', 'Cascadia Code', 'Fira Code', 'JetBrains Mono', 'Consolas', monospace;
            --transition-fast: 0.15s ease;
            --transition-smooth: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
        }

        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }

        body {
            font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
            background-color: var(--white);
            color: var(--text-primary);
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            text-rendering: optimizeLegibility;
            overflow-x: hidden;
        }

        .container {
            max-width: 1240px;
            margin: 0 auto;
            padding: 0 24px;
        }
        .container-narrow {
            max-width: 880px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* HEADER */
        .header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            box-shadow: 0 0 0 1px rgba(10, 25, 45, 0.04), var(--shadow-xs);
            transition: box-shadow var(--transition-fast);
        }
        .header.scrolled {
            box-shadow: 0 0 0 1px rgba(10, 25, 45, 0.06), var(--shadow-sm);
        }
        .nav-bar {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            padding: 13px 0;
            gap: 12px;
        }
        .logo-area {
            display: flex;
            align-items: center;
            gap: 8px;
            flex-shrink: 0;
            text-decoration: none;
        }
        .logo-icon {
            width: 38px;
            height: 38px;
            background: linear-gradient(135deg, #1a3f6e 0%, #2563aa 40%, #0e8c8c 100%);
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-weight: 800;
            font-size: 1.05rem;
            letter-spacing: -0.5px;
            box-shadow: 0 4px 14px rgba(30, 80, 144, 0.28);
            position: relative;
        }
        .logo-icon::after {
            content: '';
            position: absolute;
            inset: -3px;
            border-radius: 13px;
            border: 2px solid rgba(14, 140, 140, 0.35);
            opacity: 0.7;
            pointer-events: none;
        }
        .logo-text {
            font-size: 1.45rem;
            font-weight: 700;
            letter-spacing: -0.4px;
            color: var(--deep-700);
            text-decoration: none;
        }
        .logo-dot {
            display: inline-block;
            width: 6px;
            height: 6px;
            background: var(--teal-400);
            border-radius: var(--radius-full);
            margin-left: 1px;
            animation: pulse-teal 2.4s ease-in-out infinite;
        }
        @keyframes pulse-teal {
            0%,
            100% {
                opacity: 0.5;
                transform: scale(1);
            }
            50% {
                opacity: 1;
                transform: scale(1.8);
            }
        }
        .nav-links {
            display: flex;
            gap: 20px;
            list-style: none;
            font-weight: 500;
            align-items: center;
            flex-wrap: wrap;
        }
        .nav-links a {
            text-decoration: none;
            color: var(--text-secondary);
            transition: color var(--transition-fast);
            font-size: 0.88rem;
            position: relative;
            padding: 5px 0;
            white-space: nowrap;
        }
        .nav-links a::after {
            content: '';
            position: absolute;
            bottom: -1px;
            left: 0;
            width: 0;
            height: 2.5px;
            background: var(--teal-400);
            border-radius: 2px;
            transition: width var(--transition-smooth);
        }
        .nav-links a:hover,
        .nav-links a.active {
            color: var(--deep-500);
        }
        .nav-links a:hover::after,
        .nav-links a.active::after {
            width: 100%;
        }
        .nav-cta {
            background: var(--deep-500);
            color: white !important;
            padding: 8px 18px !important;
            border-radius: 22px;
            font-weight: 600;
            font-size: 0.82rem !important;
            transition: all var(--transition-smooth) !important;
            text-decoration: none;
            box-shadow: 0 4px 14px rgba(30, 80, 144, 0.26);
            letter-spacing: 0.01em;
        }
        .nav-cta:hover {
            background: var(--deep-600) !important;
            box-shadow: 0 6px 20px rgba(30, 80, 144, 0.36);
            transform: translateY(-1px);
            color: white !important;
        }
        .nav-cta::after {
            display: none !important;
        }

        /* PAGE HERO */
        .page-hero {
            background: linear-gradient(170deg, #f5f9fd 0%, #eaf4fd 30%, #e0fcf8 80%, #f8fafb 100%);
            padding: 48px 0 40px;
            border-bottom: 1px solid #d4e8fa;
            text-align: center;
        }
        .breadcrumb {
            font-size: 0.8rem;
            color: var(--text-muted);
            margin-bottom: 8px;
        }
        .breadcrumb a {
            color: var(--deep-500);
            text-decoration: none;
        }
        .page-hero h1 {
            font-size: 2.4rem;
            font-weight: 800;
            color: var(--deep-900);
            letter-spacing: -0.02em;
            margin-bottom: 10px;
        }
        .page-hero .hero-desc {
            font-size: 1.05rem;
            color: var(--text-tertiary);
            max-width: 720px;
            margin: 0 auto;
            line-height: 1.6;
        }

        /* SECTION */
        .section {
            padding: 64px 0;
        }
        .section-alt {
            background: #f8fafb;
        }
        .section-title {
            text-align: center;
            font-size: 1.85rem;
            font-weight: 750;
            color: var(--deep-900);
            margin-bottom: 10px;
            letter-spacing: -0.015em;
        }
        .section-sub {
            text-align: center;
            color: var(--text-muted);
            max-width: 600px;
            margin: 0 auto 40px;
            font-size: 0.96rem;
            line-height: 1.6;
        }

        /* PHILOSOPHY CARDS */
        .philosophy-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
            gap: 24px;
        }
        .philosophy-card {
            background: white;
            border-radius: var(--radius-lg);
            padding: 30px 22px;
            border: 1px solid #dce8f4;
            box-shadow: var(--shadow-card);
            text-align: center;
            transition: all var(--transition-smooth);
        }
        .philosophy-card:hover {
            border-color: var(--deep-300);
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-3px);
        }
        .philosophy-card .icon {
            font-size: 2.4rem;
            margin-bottom: 14px;
        }
        .philosophy-card h3 {
            font-size: 1.25rem;
            font-weight: 700;
            color: var(--deep-800);
            margin-bottom: 8px;
        }
        .philosophy-card p {
            color: var(--text-tertiary);
            font-size: 0.9rem;
            line-height: 1.6;
        }

        /* ARCHITECTURE */
        .arch-grid {
            display: flex;
            flex-wrap: wrap;
            gap: 28px;
            align-items: center;
            margin-top: 20px;
        }
        .arch-visual {
            flex: 1;
            min-width: 260px;
            background: var(--deep-900);
            border-radius: var(--radius-lg);
            padding: 30px 20px;
            box-shadow: var(--shadow-lg);
        }
        .arch-layer {
            background: #132f56;
            border-radius: var(--radius-sm);
            padding: 12px 18px;
            margin-bottom: 12px;
            color: #d4e8fa;
            font-family: var(--font-mono);
            font-size: 0.8rem;
            border-left: 3px solid var(--teal-400);
            text-align: center;
        }
        .arch-layer.client {
            border-left-color: #f5b642;
        }
        .arch-arrow {
            text-align: center;
            color: var(--teal-300);
            font-size: 1.2rem;
            margin: 4px 0;
        }
        .arch-text {
            flex: 1.2;
            min-width: 280px;
        }
        .arch-text h3 {
            font-size: 1.35rem;
            font-weight: 700;
            color: var(--deep-800);
            margin-bottom: 12px;
        }
        .arch-text p {
            color: var(--text-tertiary);
            font-size: 0.93rem;
            line-height: 1.7;
            margin-bottom: 10px;
        }

        /* GOALS */
        .goals-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 20px;
        }
        .goal-card {
            background: white;
            border-radius: var(--radius-md);
            padding: 24px 18px;
            border: 1px solid #dce8f4;
            text-align: center;
            box-shadow: var(--shadow-xs);
        }
        .goal-card .goal-icon {
            font-size: 2rem;
            margin-bottom: 10px;
        }
        .goal-card h4 {
            font-weight: 650;
            color: var(--deep-700);
            margin-bottom: 6px;
        }
        .goal-card p {
            font-size: 0.82rem;
            color: var(--text-muted);
            line-height: 1.5;
        }

        /* FOOTER */
        .footer {
            background: var(--deep-950);
            color: #b8cde0;
            padding: 44px 0 22px;
        }
        .footer-grid {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 28px;
            margin-bottom: 32px;
        }
        .footer-col {
            min-width: 120px;
        }
        .footer-col h4 {
            color: white;
            margin-bottom: 12px;
            font-weight: 600;
            font-size: 0.82rem;
            letter-spacing: 0.04em;
            text-transform: uppercase;
        }
        .footer-col ul {
            list-style: none;
        }
        .footer-col li {
            margin-bottom: 8px;
        }
        .footer-col a {
            color: #a8cff5;
            text-decoration: none;
            font-size: 0.82rem;
        }
        .footer-col a:hover {
            color: white;
        }
        .footer-brand {
            font-size: 1.25rem;
            font-weight: 700;
            color: white;
            margin-bottom: 7px;
        }
        .footer-brand-dot {
            display: inline-block;
            width: 5px;
            height: 5px;
            background: var(--teal-400);
            border-radius: var(--radius-full);
            margin-left: 2px;
            vertical-align: middle;
        }
        .copyright {
            text-align: center;
            border-top: 1px solid #1a3050;
            padding-top: 20px;
            font-size: 0.76rem;
            color: #8aa0b8;
        }
        .copyright a {
            color: #a8cff5;
            text-decoration: none;
        }

        @media (max-width: 900px) {
            .page-hero h1 {
                font-size: 1.8rem;
            }
            .section-title {
                font-size: 1.5rem;
            }
            .arch-grid {
                flex-direction: column;
            }
            .nav-links {
                gap: 12px;
                font-size: 0.8rem;
            }
        }
        @media (max-width: 600px) {
            .container {
                padding: 0 16px;
            }
            .page-hero h1 {
                font-size: 1.5rem;
            }
            .philosophy-grid,
            .goals-grid {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                gap: 16px;
            }
        }