@import url('https://fonts.googleapis.com/css2?family=Manrope:wght@400;600;800&family=Noto+Sans+SC:wght@400;700;900&display=swap');

:root {
    --paper-white: #FAFAF8;
    --ink-black: #111111;
    --vermilion: #D8401F;
    --charcoal: #333331;
    --cool-grey: #8A8A86;
    
    --space-1: 8px;
    --space-2: 16px;
    --space-3: 24px;
    --space-4: 32px;
    --space-6: 48px;
    --space-8: 64px;
    --space-12: 96px;
    --space-16: 128px;
}

/* BASE */
* { margin: 0; padding: 0; box-sizing: border-box; }

body {
    background-color: var(--paper-white);
    color: var(--ink-black);
    font-family: 'Manrope', 'Noto Sans SC', sans-serif;
    line-height: 1.4;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

ul { list-style: none; }

a {
    color: var(--ink-black);
    text-decoration: none;
    transition: all 0.2s ease;
}

a.underline-hover:hover {
    text-decoration: underline;
    text-decoration-thickness: 1px;
    text-underline-offset: 4px;
}

/* TYPOGRAPHY */
h1 {
    font-size: clamp(48px, 8vw, 96px);
    font-weight: 900;
    line-height: 1.05;
    letter-spacing: -0.03em;
    margin-bottom: var(--space-4);
}

h2 {
    font-size: clamp(32px, 5vw, 64px);
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: -0.02em;
}

h3 {
    font-size: 24px;
    font-weight: 700;
    line-height: 1.2;
}

.micro-label {
    font-family: 'Manrope', sans-serif;
    font-size: 11px;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.2em;
    color: var(--cool-grey);
    display: block;
    margin-bottom: var(--space-2);
}

.tabular-num {
    font-variant-numeric: tabular-nums;
    font-family: 'Manrope', sans-serif;
}

.section-num {
    font-size: clamp(64px, 10vw, 120px);
    font-weight: 800;
    color: transparent;
    -webkit-text-stroke: 1px var(--ink-black);
    line-height: 1;
    opacity: 0.2;
}

p {
    font-size: 16px;
    color: var(--charcoal);
    line-height: 1.6;
}

/* LAYOUT & GRID */
.container {
    max-width: 1440px;
    margin: 0 auto;
    padding: 0 var(--space-3);
}

.swiss-grid {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    gap: var(--space-3);
}

.grid-col-4 { grid-column: span 4; }
.grid-col-6 { grid-column: span 6; }
.grid-col-8 { grid-column: span 8; }
.grid-col-12 { grid-column: span 12; }

/* DECORATION */
.hairline-top { border-top: 1px solid var(--ink-black); }
.hairline-bottom { border-bottom: 1px solid var(--ink-black); }
.hairline-left { border-left: 1px solid var(--ink-black); }
.hairline-right { border-right: 1px solid var(--ink-black); }

/* COMPONENTS */
/* Header & Nav */
.site-header {
    padding: var(--space-3) 0;
    position: sticky;
    top: 0;
    background: var(--paper-white);
    z-index: 100;
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo-lockup {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.logo-lockup img {
    width: 32px;
    height: 32px;
}

.logo-text {
    display: flex;
    flex-direction: column;
}

.logo-cn {
    font-family: 'Noto Sans SC', sans-serif;
    font-weight: 900;
    font-size: 16px;
    line-height: 1;
    color: var(--ink-black);
}

.logo-en {
    font-family: 'Manrope', sans-serif;
    font-weight: 800;
    font-size: 9px;
    letter-spacing: 0.05em;
    line-height: 1;
    color: var(--ink-black);
    margin-top: 2px;
}

.nav-links {
    display: flex;
    gap: var(--space-4);
}

.nav-links a {
    font-size: 14px;
    font-weight: 600;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 16px 32px;
    font-size: 14px;
    font-weight: 800;
    text-align: center;
    border-radius: 2px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    cursor: pointer;
    border: 1px solid var(--ink-black);
    background: transparent;
    color: var(--ink-black);
    transition: all 0.2s ease;
}

.btn:hover {
    background: var(--ink-black);
    color: var(--paper-white);
}

/* Strictly one vermilion button per viewport logic */
.btn-primary {
    background: var(--vermilion);
    color: var(--paper-white);
    border: 1px solid var(--vermilion);
}

.btn-primary:hover {
    background: #bd3518; /* slightly darker vermilion */
    border-color: #bd3518;
}

/* SECTIONS */
.section {
    padding: var(--space-12) 0;
}

.hero-section {
    min-height: 80vh;
    display: flex;
    align-items: center;
    padding-top: var(--space-8);
}

.hero-content p {
    font-size: 20px;
    max-width: 600px;
    margin-bottom: var(--space-6);
}

/* Feature Cards */
.feature-card {
    padding: var(--space-4);
    height: 100%;
}

.feature-card h3 {
    margin: var(--space-4) 0 var(--space-2);
}

/* Pricing Table */
.pricing-card {
    padding: var(--space-6) var(--space-4);
    display: flex;
    flex-direction: column;
}

.price-value {
    font-size: 48px;
    font-weight: 900;
    margin: var(--space-3) 0;
    line-height: 1;
}

.price-value span {
    font-size: 16px;
    font-weight: 400;
    color: var(--cool-grey);
}

.pricing-card ul {
    margin: var(--space-4) 0;
    flex-grow: 1;
}

.pricing-card li {
    padding: var(--space-2) 0;
    border-bottom: 1px solid #E5E5E0;
    font-size: 14px;
}

/* Footer */
.site-footer {
    padding: var(--space-8) 0;
}

.footer-links {
    display: flex;
    gap: var(--space-4);
}

@media (max-width: 1024px) {
    .grid-col-4 { grid-column: span 6; }
}

@media (max-width: 768px) {
    .swiss-grid { display: flex; flex-direction: column; gap: var(--space-4); }
    .nav-links { display: none; } /* Simplified mobile nav for strict design */
    .hero-section { min-height: 60vh; }
    .section-num { font-size: 80px; }
}

/* Floating Back Button */
.floating-back {
    position: fixed;
    bottom: 32px;
    right: 32px;
    background: var(--ink-black);
    color: var(--paper-white);
    padding: 12px 24px;
    border-radius: 4px;
    font-size: 11px;
    font-weight: 800;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    z-index: 1000;
    display: flex;
    align-items: center;
    gap: 8px;
    border: 1px solid var(--ink-black);
    transition: all 0.2s ease;
}
.floating-back:hover {
    background: var(--paper-white);
    color: var(--ink-black);
    text-decoration: none;
}