:root {
  --pi-black: #090909;
  --pi-charcoal: #151515;
  --pi-white: #f7f5ef;
  --pi-paper: #eeeae0;
  --pi-gold: #d2b47c;
  --pi-gold-dark: #9c7a42;
  --pi-muted: #aaa69d;
  --pi-line: rgba(210, 180, 124, .28);
}

.phase-two-home {
  background: var(--pi-black);
  color: var(--pi-white);
  font-family: "Inter", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
}

.phase-two-home .topbar { background: rgba(9, 9, 9, .9); border-color: var(--pi-line); }
.phase-two-home .topbar nav a { color: #d8d4ca; }
.phase-two-home .topbar nav a:hover { color: var(--pi-gold); }
.phase-two-home .section { width: min(1120px, calc(100% - 2rem)); padding: clamp(4rem, 7vw, 6.5rem) 0; }
.phase-two-home .section-heading { max-width: 740px; margin-bottom: clamp(1.8rem, 4vw, 3rem); }
.phase-two-home .section-kicker,
.phase-two-home .card-index,
.phase-two-home .card-label { color: var(--pi-gold); letter-spacing: .12em; }
.phase-two-home h1, .phase-two-home h2, .phase-two-home h3 { letter-spacing: -.025em; }
.phase-two-home h2 { font-size: clamp(2rem, 4vw, 3.8rem); }
.phase-two-home p { color: #c9c5bb; }
.phase-two-home strong { color: var(--pi-white); }

.phase-two-hero { min-height: min(760px, 82svh); align-items: center; }
.phase-two-hero .hero-image { opacity: .58; filter: grayscale(.22) saturate(.8) contrast(1.08); }
.phase-two-hero .hero-shade { background: linear-gradient(90deg, rgba(5,5,5,.98) 0%, rgba(5,5,5,.82) 48%, rgba(5,5,5,.28) 100%), linear-gradient(0deg, #090909 0%, transparent 35%); }
.phase-two-hero .hero-content { width: min(900px, calc(100% - 2rem)); margin: clamp(6rem, 11vh, 8rem) 0 3.5rem clamp(1rem, 7vw, 6rem); }
.phase-two-hero .eyebrow { margin-bottom: clamp(1.4rem, 3vw, 2.2rem); font-size: clamp(.82rem, 1.2vw, .95rem); letter-spacing: .08em; }
.phase-two-hero h1 { max-width: 100%; margin-bottom: 1rem; font-size: clamp(3rem, 6.4vw, 6rem); line-height: 1.02; }
.mobile-title-break { display: none; }
.hero-subtitle { max-width: 780px; margin-bottom: 1.15rem; color: #ece6da !important; font-size: clamp(1.25rem, 2.3vw, 2rem); line-height: 1.4; }
.phase-two-hero .hero-copy { max-width: 720px; margin-bottom: 0; color: #c9c5bb; font-size: clamp(.95rem, 1.35vw, 1.08rem); }
.phase-two-home .button { border-radius: 0; transition: background .18s ease, color .18s ease, border-color .18s ease; }
.phase-two-home .button.primary { background: var(--pi-gold); border-color: var(--pi-gold); color: var(--pi-black); }
.phase-two-home .button.primary:hover { background: #e0c895; }
.phase-two-home .button.ghost, .button.outline { background: transparent; border-color: rgba(210,180,124,.58); color: var(--pi-white); }
.phase-two-home .button.ghost:hover, .button.outline:hover { border-color: var(--pi-gold); color: var(--pi-gold); }

.split-section { display: grid; grid-template-columns: minmax(220px, .7fr) minmax(300px, 1.3fr); gap: clamp(2rem, 7vw, 6rem); border-bottom: 1px solid var(--pi-line); }
.compact-heading { margin-bottom: 0 !important; }
.prose-stack { display: grid; gap: 1rem; }
.prose-stack p { margin: 0; font-size: clamp(1rem, 1.4vw, 1.16rem); }
.prose-stack h3 { margin: 0; font-size: clamp(1.45rem, 2.8vw, 2.2rem); }
.focus-list { display: flex; flex-wrap: wrap; gap: .55rem; margin: -.25rem 0 0; padding: 0; list-style: none; }
.focus-list li { padding: .5rem .75rem; border: 1px solid var(--pi-line); color: #d7d2c8; font-size: .92rem; }

.services-section, .audio-section, .contact-section { background: linear-gradient(180deg, rgba(210,180,124,.055), transparent 65%); }
.service-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: .85rem; }
.media-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: .85rem; }
.simple-card, .learning-card, .media-card, .contact-card { border: 1px solid var(--pi-line); background: var(--pi-charcoal); }
.simple-card { min-height: 220px; padding: 1.4rem; }
.simple-card > span, .media-number { display: block; margin-bottom: 2.5rem; color: var(--pi-gold); font-size: .72rem; }
.simple-card p, .media-card p { margin-bottom: 0; color: var(--pi-muted); }
.service-logic { margin-top: 1.25rem !important; color: var(--pi-gold) !important; font-weight: 700; letter-spacing: .04em; }
.service-path { display: flex; align-items: center; gap: clamp(.65rem, 2vw, 1.2rem); margin: 1.5rem 0 0; color: var(--pi-white) !important; }
.service-path b { color: var(--pi-gold); }
.section-actions { display: flex; flex-wrap: wrap; gap: .75rem; margin-top: 1.5rem; }

.articles-section { border-block: 1px solid var(--pi-line); }
.section-heading > p:not(.section-kicker) { margin-bottom: .4rem; }
.section-note { color: var(--pi-gold) !important; }
.phase-two-articles { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.phase-two-articles .feature-card { min-height: 300px; display: flex; flex-direction: column; border-color: var(--pi-line); background: var(--pi-charcoal); }
.phase-two-articles .feature-card a { color: var(--pi-gold); }
.zhihu-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1rem; }
.zhihu-card { min-height: 300px; overflow: hidden; border: 1px solid var(--pi-line); background: var(--pi-charcoal); }
.column-cover { aspect-ratio: 16 / 10; border-bottom: 1px solid var(--pi-line); }
.column-cover-pending { display: grid; place-items: center; padding: 1rem; background: linear-gradient(135deg, rgba(210,180,124,.12), rgba(255,255,255,.025)); color: var(--pi-gold); text-align: center; font-size: .82rem; letter-spacing: .08em; }
.branded-column-cover { display: flex; flex-direction: column; justify-content: space-between; padding: 1.35rem; background: radial-gradient(circle at 88% 15%, rgba(210,180,124,.24), transparent 35%), linear-gradient(145deg, #1b1a17, #080808); }
.branded-column-cover span { color: var(--pi-gold); font-size: .7rem; font-weight: 700; letter-spacing: .08em; }
.branded-column-cover strong { max-width: 12ch; color: var(--pi-white); font-size: clamp(1.45rem, 2.5vw, 2.2rem); line-height: 1.08; }
.zhihu-card-body { display: flex; min-height: 300px; flex-direction: column; padding: 1.35rem; }
.zhihu-card-body p:not(.card-index) { color: var(--pi-muted); }
.zhihu-card-body .button { align-self: flex-start; margin-top: auto; }

.contact-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; }
.learning-card { min-height: 350px; padding: clamp(1.4rem, 3vw, 2rem); display: flex; flex-direction: column; }
.learning-card h3 { max-width: 23ch; }
.learning-focus { color: var(--pi-muted) !important; }
.learning-card .button { align-self: flex-start; margin-top: auto; }
.placeholder-button:disabled, .media-card button:disabled { opacity: .55; cursor: not-allowed; }
.after-note { margin: 1.25rem 0 0; color: var(--pi-muted) !important; }

.video-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1rem; }
.video-card { overflow: hidden; border: 1px solid var(--pi-line); background: var(--pi-charcoal); }
.video-card > img, .video-card > video { display: block; width: 100%; aspect-ratio: 9 / 12; object-fit: cover; object-position: center top; border-bottom: 1px solid var(--pi-line); background: #000; }
.video-card-body { display: flex; min-height: 270px; flex-direction: column; padding: 1.35rem; }
.video-category { margin-bottom: .65rem; color: var(--pi-gold) !important; font-size: .78rem; font-weight: 700; letter-spacing: .06em; }
.video-card-body > p:not(.video-category) { color: var(--pi-muted); }
.video-card-body .button { align-self: flex-start; margin-top: auto; }
.video-card > img.full-video-cover { aspect-ratio: 16 / 9; object-fit: contain; object-position: center; }
.video-download { margin-top: 1rem !important; }
.audio-feature { display: grid; grid-template-columns: minmax(280px, 1.2fr) minmax(280px, .8fr); gap: clamp(2rem, 6vw, 5rem); align-items: center; padding: clamp(1.5rem, 4vw, 3rem); border: 1px solid var(--pi-line); background: var(--pi-charcoal); }
.audio-feature h3 { font-size: clamp(1.5rem, 3vw, 2.35rem); }
.audio-player-wrap { display: grid; gap: .8rem; }
.audio-player-wrap > span { color: var(--pi-gold); font-weight: 700; }
.audio-player-wrap audio { width: 100%; min-height: 54px; }
.resources-section { border-top: 1px solid var(--pi-line); }
.resource-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1rem; }
.resource-card { overflow: hidden; border: 1px solid var(--pi-line); background: var(--pi-charcoal); }
.resource-card > img { display: block; width: 100%; aspect-ratio: 16 / 10; object-fit: cover; object-position: top center; border-bottom: 1px solid var(--pi-line); }
.resource-card-body { display: flex; min-height: 330px; flex-direction: column; padding: 1.35rem; }
.resource-card-body h3 { font-size: 1.25rem; line-height: 1.35; }
.resource-card-body > p:not(.resource-type) { color: var(--pi-muted); }
.resource-type { margin-bottom: .6rem; color: var(--pi-gold) !important; font-size: .75rem; font-weight: 700; letter-spacing: .1em; }
.resource-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 1rem; margin-top: auto; }
.text-link { color: var(--pi-gold); text-decoration: underline; text-underline-offset: .25em; }
.video-dialog { width: min(520px, calc(100% - 1.5rem)); max-height: calc(100svh - 1.5rem); padding: 0; border: 1px solid var(--pi-line); background: #080808; color: var(--pi-white); }
.video-dialog::backdrop { background: rgba(0,0,0,.84); backdrop-filter: blur(5px); }
.video-dialog-header { display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding: .9rem 1rem; border-bottom: 1px solid var(--pi-line); }
.video-dialog-header h2 { margin: 0; font-size: 1rem; line-height: 1.3; }
.close-video { flex: 0 0 auto; padding: .45rem .65rem; border: 1px solid var(--pi-line); background: transparent; color: var(--pi-white); font: inherit; cursor: pointer; }
.dialog-video { display: block; width: 100%; max-height: calc(100svh - 5rem); background: #000; }

.cta-section { display: grid; grid-template-columns: minmax(260px, 1fr) minmax(300px, 1fr); gap: clamp(2rem, 7vw, 6rem); padding: clamp(4rem, 8vw, 7rem) max(1rem, calc((100vw - 1120px) / 2)); background: var(--pi-gold); color: var(--pi-black); }
.cta-section .section-kicker, .cta-section h2, .cta-section p, .cta-section small { color: var(--pi-black); }
.cta-section h2 { max-width: 13ch; }
.cta-section .button.primary { background: var(--pi-black); border-color: var(--pi-black); color: var(--pi-white); }
.button.light-outline { background: transparent; border-color: rgba(9,9,9,.45); color: var(--pi-black); }
.cta-content small { display: block; margin-top: 1.4rem; }

.contact-card { padding: clamp(1.4rem, 3vw, 2rem); }
.contact-card p { margin-bottom: .2rem; color: var(--pi-gold); }
.contact-card strong { display: block; margin-bottom: 1.4rem; font-size: clamp(1.5rem, 3vw, 2.3rem); letter-spacing: .02em; }
.copy-status { min-height: 1.6em; margin: 1rem 0 0; color: var(--pi-gold) !important; }
.referral-manual { max-width: 620px; margin-top: 1.25rem; }
.referral-manual label { display: block; margin-bottom: .65rem; color: #d7d2c8; }
.referral-manual > div { display: flex; gap: .65rem; }
.referral-manual input { min-width: 0; flex: 1; padding: .75rem .9rem; border: 1px solid var(--pi-line); background: #0b0b0b; color: var(--pi-white); font: inherit; text-transform: uppercase; }
.referral-status { min-height: 1.4em; margin: .9rem 0 0; color: var(--pi-gold) !important; font-size: .9rem; }

.message-section { border-top: 1px solid var(--pi-line); }
.message-form { display: grid; max-width: 820px; gap: 1rem; padding: clamp(1.3rem, 4vw, 2.5rem); border: 1px solid var(--pi-line); background: var(--pi-charcoal); }
.message-field-row { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; }
.message-form label { display: grid; gap: .55rem; color: #ddd8cd; font-weight: 700; }
.message-form input, .message-form select, .message-form textarea { width: 100%; padding: .85rem .9rem; border: 1px solid var(--pi-line); border-radius: 0; background: #090909; color: var(--pi-white); font: inherit; font-weight: 400; }
.message-form textarea { resize: vertical; line-height: 1.6; }
.message-form input:focus, .message-form select:focus, .message-form textarea:focus { outline: 1px solid var(--pi-gold); outline-offset: 1px; }
.message-form .button { justify-self: start; margin-top: .25rem; }
.message-note, .message-status { margin: 0; color: var(--pi-muted) !important; font-size: .86rem; }
.message-status { min-height: 1.3em; color: var(--pi-gold) !important; }

.phase-two-footer { align-items: flex-end; padding: clamp(2rem, 5vw, 4rem) clamp(1rem, 4vw, 3.5rem); border-color: var(--pi-line); background: #050505; }
.phase-two-footer img { width: min(270px, 70vw); }
.phase-two-footer p { margin: .45rem 0 0; color: var(--pi-muted); }
.footer-contact { display: flex; flex-wrap: wrap; justify-content: center; gap: .4rem; color: #c9c5bb; }

@media (max-width: 900px) {
  .service-grid, .media-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .service-grid article:last-child { grid-column: 1 / -1; }
  .zhihu-grid { grid-template-columns: 1fr; }
  .video-grid { grid-template-columns: 1fr; }
  .video-card { display: grid; grid-template-columns: minmax(210px, .8fr) minmax(280px, 1.2fr); }
  .video-card > img, .video-card > video { height: 100%; aspect-ratio: auto; }
  .audio-feature { grid-template-columns: 1fr; }
  .resource-grid { grid-template-columns: 1fr; }
  .resource-card { display: grid; grid-template-columns: minmax(210px, .8fr) minmax(280px, 1.2fr); }
  .resource-card > img { height: 100%; aspect-ratio: auto; }
  .resource-card-body { min-height: 280px; }
  .phase-two-articles { grid-template-columns: 1fr; }
  .phase-two-articles .feature-card { min-height: 230px; }
  .cta-section { grid-template-columns: 1fr; }
  .cta-section h2 { max-width: 18ch; }
  .phase-two-footer { align-items: flex-start; }
}

@media (max-width: 820px) {
  .phase-two-home .topbar { position: relative; }
  .phase-two-hero { min-height: 70svh; margin-top: 0; }
  .phase-two-hero .hero-content { margin: 3.75rem 1rem 3rem; }
  .phase-two-hero .hero-shade { background: linear-gradient(90deg, rgba(5,5,5,.95), rgba(5,5,5,.55)), linear-gradient(0deg, #090909, transparent 55%); }
  .split-section { grid-template-columns: 1fr; gap: 1rem; }
}

@media (max-width: 600px) {
  .phase-two-home .section { width: min(100% - 2rem, 1120px); padding: 3.75rem 0; }
  .phase-two-hero h1 { font-size: clamp(2.55rem, 12vw, 3.5rem); line-height: 1.04; }
  .mobile-title-break { display: inline; }
  .hero-subtitle { font-size: 1.18rem; line-height: 1.45; }
  .phase-two-hero .hero-copy { font-size: .95rem; line-height: 1.65; }
  .service-grid, .media-grid, .contact-grid { grid-template-columns: 1fr; }
  .service-grid article:last-child { grid-column: auto; }
  .service-path { flex-wrap: wrap; }
  .simple-card { min-height: 190px; }
  .learning-card { min-height: 310px; }
  .media-card { min-height: 220px; }
  .video-card { display: block; }
  .resource-card { display: block; }
  .resource-card > img { width: min(72vw, 280px); height: auto; aspect-ratio: 16 / 10; margin: 1rem auto 0; border: 1px solid var(--pi-line); object-fit: cover; object-position: top center; }
  .resource-card-body { min-height: 0; padding: 1.1rem; }
  .resource-actions { margin-top: 1.1rem; }
  .video-card > img, .video-card > video { width: min(68vw, 250px); height: auto; aspect-ratio: 9 / 12; margin: 1rem auto 0; border: 1px solid var(--pi-line); object-fit: cover; }
  .video-card > img.full-video-cover { width: calc(100% - 2rem); max-width: none; aspect-ratio: 16 / 9; object-fit: contain; }
  .video-card-body { min-height: 0; padding: 1.1rem; }
  .section-actions .button { width: 100%; }
  .cta-section { padding-block: 3.75rem; }
  .phase-two-footer { gap: 2rem; }
  .footer-contact { justify-content: flex-start; }
  .referral-manual > div { align-items: stretch; flex-direction: column; }
  .message-field-row { grid-template-columns: 1fr; }
  .message-form .button { width: 100%; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .is-visible { animation: none; }
}