:root {
    --bg: #f4efe8;
    --surface: rgba(255, 255, 255, 0.78);
    --surface-strong: #fffdf9;
    --surface-dark: #152238;
    --text: #18202c;
    --text-soft: #556070;
    --line: rgba(24, 32, 44, 0.12);
    --orange: #ff6b35;
    --teal: #0f8b8d;
    --blue: #3b82f6;
    --gold: #c18a1f;
    --shadow: 0 22px 60px rgba(27, 36, 48, 0.12);
    --radius-xl: 32px;
    --radius-lg: 24px;
    --radius-md: 18px;
    --container: 1180px;
    --transition: 220ms ease;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    color: var(--text);
    font-family: "Avenir Next", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    background:
        radial-gradient(circle at top left, rgba(255, 107, 53, 0.15), transparent 32%),
        radial-gradient(circle at top right, rgba(15, 139, 141, 0.15), transparent 28%),
        linear-gradient(180deg, #fbf6ef 0%, #f4efe8 100%);
    line-height: 1.65;
}

a {
    color: inherit;
    text-decoration: none;
}

button,
input,
textarea {
    font: inherit;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 40;
    backdrop-filter: blur(18px);
    background: rgba(244, 239, 232, 0.8);
    border-bottom: 1px solid rgba(24, 32, 44, 0.08);
}

.site-header.is-scrolled {
    box-shadow: 0 10px 30px rgba(24, 32, 44, 0.08);
}

.site-nav,
.hero-shell,
.section,
.footer-shell {
    width: min(calc(100% - 40px), var(--container));
    margin: 0 auto;
}

.site-nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    min-height: 78px;
}

.brand-mark {
    display: inline-flex;
    flex-direction: column;
    gap: 2px;
}

.brand-kicker {
    font-size: 0.78rem;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--orange);
    font-weight: 700;
}

.brand-name {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--surface-dark);
}

.nav-links {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    margin: 0;
    padding: 0;
    list-style: none;
}

.nav-links a {
    color: var(--text-soft);
    font-size: 0.95rem;
    font-weight: 600;
}

.nav-links a:hover {
    color: var(--surface-dark);
}

.hero {
    padding: 72px 0 28px;
}

.hero-shell {
    display: grid;
    grid-template-columns: minmax(0, 1.35fr) minmax(300px, 0.85fr);
    gap: 28px;
    align-items: stretch;
}

.hero-copy,
.hero-panel-card,
.contact-panel,
.about-note,
.principle-card,
.app-card {
    background: var(--surface);
    border: 1px solid rgba(255, 255, 255, 0.65);
    box-shadow: var(--shadow);
    backdrop-filter: blur(20px);
}

.hero-copy {
    padding: 48px;
    border-radius: var(--radius-xl);
    position: relative;
    overflow: hidden;
}

.hero-copy::after {
    content: "";
    position: absolute;
    right: -120px;
    top: -120px;
    width: 280px;
    height: 280px;
    background: radial-gradient(circle, rgba(255, 107, 53, 0.18) 0%, rgba(255, 107, 53, 0) 72%);
    pointer-events: none;
}

.eyebrow {
    margin: 0 0 14px;
    color: var(--orange);
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.16em;
}

.hero h1,
.section-head h2,
.about-copy h2,
.contact-panel h2 {
    margin: 0;
    color: var(--surface-dark);
    line-height: 1.08;
}

.hero h1 {
    max-width: 11ch;
    font-size: clamp(2.8rem, 7vw, 5.3rem);
}

.hero-text {
    max-width: 640px;
    margin: 22px 0 0;
    color: var(--text-soft);
    font-size: 1.06rem;
}

.hero-actions,
.contact-actions,
.app-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
}

.hero-actions {
    margin-top: 30px;
}

.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 50px;
    padding: 0 20px;
    border-radius: 999px;
    font-weight: 700;
    transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
}

.button:hover {
    transform: translateY(-1px);
}

.button-primary {
    background: var(--surface-dark);
    color: #fff;
    box-shadow: 0 18px 30px rgba(21, 34, 56, 0.16);
}

.button-secondary {
    background: rgba(255, 255, 255, 0.72);
    color: var(--surface-dark);
    border: 1px solid rgba(24, 32, 44, 0.1);
}

.hero-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 28px;
}

.hero-meta span,
.focus-list span,
.app-tag,
.app-status {
    display: inline-flex;
    align-items: center;
    min-height: 32px;
    padding: 0 12px;
    border-radius: 999px;
    font-size: 0.88rem;
    font-weight: 600;
}

.hero-meta span,
.focus-list span {
    color: var(--surface-dark);
    background: rgba(255, 255, 255, 0.72);
    border: 1px solid rgba(24, 32, 44, 0.08);
}

.hero-panel {
    display: flex;
    flex-direction: column;
    gap: 22px;
}

.hero-panel-card {
    border-radius: var(--radius-lg);
    padding: 28px;
}

.panel-title {
    margin: 0 0 14px;
    font-size: 0.92rem;
    font-weight: 700;
    color: var(--text-soft);
}

.focus-list {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.stats-card {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 14px;
}

.stats-card div {
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding: 18px;
    border-radius: var(--radius-md);
    background: rgba(255, 255, 255, 0.68);
}

.stats-card strong {
    font-size: 1.8rem;
    line-height: 1;
    color: var(--surface-dark);
}

.stats-card span {
    color: var(--text-soft);
    font-size: 0.92rem;
}

.section {
    padding: 54px 0;
}

.section-head {
    max-width: 760px;
    margin-bottom: 26px;
}

.section-head h2 {
    font-size: clamp(2rem, 5vw, 3.5rem);
}

.section-head p {
    margin: 16px 0 0;
    color: var(--text-soft);
    font-size: 1.02rem;
}

.apps-grid,
.principles-grid {
    display: grid;
    gap: 20px;
}

.apps-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.principles-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.app-card {
    border-radius: var(--radius-lg);
    padding: 24px;
    transition: transform var(--transition), box-shadow var(--transition);
}

.app-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 28px 60px rgba(27, 36, 48, 0.16);
}

.app-card-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
    margin-bottom: 18px;
}

.app-symbol {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 68px;
    height: 68px;
    border-radius: 22px;
    background: linear-gradient(135deg, rgba(21, 34, 56, 0.94), rgba(38, 61, 96, 0.82));
    color: #fff;
    font-size: 1.02rem;
    font-weight: 800;
    letter-spacing: 0.08em;
}

.app-head {
    display: flex;
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: 8px;
}

.app-tag {
    background: rgba(21, 34, 56, 0.08);
    color: var(--surface-dark);
}

.app-status {
    background: rgba(255, 107, 53, 0.12);
    color: #8e421d;
}

.app-card h3 {
    margin: 0;
    font-size: 1.5rem;
    color: var(--surface-dark);
}

.app-full-name {
    margin: 10px 0 0;
    font-size: 0.96rem;
    color: var(--text-soft);
}

.app-description {
    margin: 14px 0 0;
    color: var(--text);
    font-size: 1rem;
}

.app-actions {
    margin-top: 22px;
}

.text-link {
    font-weight: 700;
    color: var(--surface-dark);
    position: relative;
}

.text-link::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: -4px;
    width: 100%;
    height: 2px;
    background: currentColor;
    transform-origin: left;
    transform: scaleX(0.45);
    transition: transform var(--transition);
}

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

.accent-run .app-symbol { background: linear-gradient(135deg, #162a48, #ff6b35); }
.accent-bmi .app-symbol { background: linear-gradient(135deg, #183048, #0f8b8d); }
.accent-login .app-symbol { background: linear-gradient(135deg, #21183f, #7c5cff); }
.accent-metro .app-symbol { background: linear-gradient(135deg, #21262f, #3b82f6); }
.accent-prompt .app-symbol { background: linear-gradient(135deg, #2b2317, #c18a1f); }

.philosophy-section {
    position: relative;
}

.principle-card {
    padding: 24px;
    border-radius: var(--radius-lg);
}

.principle-card h3 {
    margin: 0 0 10px;
    color: var(--surface-dark);
    font-size: 1.24rem;
}

.principle-card p {
    margin: 0;
    color: var(--text-soft);
}

.about-layout {
    display: grid;
    grid-template-columns: minmax(0, 1.2fr) minmax(280px, 0.8fr);
    gap: 22px;
    align-items: stretch;
}

.about-copy {
    padding: 12px 0;
}

.about-copy p {
    max-width: 720px;
    color: var(--text-soft);
    font-size: 1.02rem;
}

.about-note {
    padding: 28px;
    border-radius: var(--radius-lg);
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.84), rgba(255, 253, 249, 0.96));
}

.note-label {
    margin: 0;
    color: var(--orange);
    font-size: 0.82rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.14em;
}

.about-note ul {
    margin: 18px 0 0;
    padding: 0;
    list-style: none;
}

.about-note li {
    position: relative;
    padding-left: 18px;
    color: var(--text);
    margin-bottom: 12px;
}

.about-note li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0.7em;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--orange);
}

.contact-panel {
    border-radius: var(--radius-xl);
    padding: 32px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
}

.contact-panel p {
    max-width: 700px;
    color: var(--text-soft);
}

.site-footer {
    padding: 18px 0 36px;
}

.footer-shell {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding-top: 10px;
    border-top: 1px solid rgba(24, 32, 44, 0.1);
}

.footer-title {
    margin: 0;
    color: var(--surface-dark);
    font-weight: 800;
}

.footer-copy p:last-child {
    margin-bottom: 0;
    color: var(--text-soft);
}

.footer-links {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
}

.footer-links a {
    color: var(--text-soft);
    font-weight: 600;
}

.footer-links a:hover {
    color: var(--surface-dark);
}

.footer-bottom {
    width: min(calc(100% - 40px), var(--container));
    margin: 12px auto 0;
    color: var(--text-soft);
    font-size: 0.92rem;
}

@media (max-width: 1024px) {
    .hero-shell,
    .about-layout,
    .contact-panel,
    .principles-grid {
        grid-template-columns: 1fr;
    }

    .apps-grid {
        grid-template-columns: 1fr;
    }

    .contact-panel {
        align-items: flex-start;
    }
}

@media (max-width: 720px) {
    .site-nav {
        align-items: flex-start;
        flex-direction: column;
        justify-content: center;
        padding: 14px 0;
    }

    .nav-links {
        gap: 14px;
    }

    .hero {
        padding-top: 42px;
    }

    .hero-copy,
    .hero-panel-card,
    .app-card,
    .principle-card,
    .contact-panel,
    .about-note {
        padding: 22px;
        border-radius: 22px;
    }

    .hero h1 {
        max-width: none;
    }

    .stats-card {
        grid-template-columns: 1fr;
    }

    .app-card-top {
        align-items: flex-start;
        flex-direction: column;
    }

    .app-head {
        justify-content: flex-start;
    }

    .hero-actions,
    .contact-actions {
        flex-direction: column;
        align-items: stretch;
    }

    .button {
        width: 100%;
    }

    .footer-shell {
        align-items: flex-start;
        flex-direction: column;
    }
}