/* Taste: recruiter-facing portfolio, cool grey/blue, native CSS.
   DESIGN_VARIANCE 6 / MOTION_INTENSITY 4 / VISUAL_DENSITY 4.
   Requested three-column case rows; 20px media panels, 16px app frames, pill controls. */
:root{--paper:#f3f5f6;--hero-rgb:243,245,246;--ink:#20262e;--muted:#5f6b76;--line:#d6dce1;--accent:#245bc3;--surface:#e7ecf1;--yuanqi:#dcecf4;--applock:#e0e8f2;--magnifier:#dce9e5;--cike:#e8ebef;--header:rgba(243,245,246,.95);color-scheme:light;font-family:'Segoe UI','PingFang SC','Microsoft YaHei',sans-serif;font-synthesis:none}
:root[data-theme=dark]{--paper:#171c23;--hero-rgb:23,28,35;--ink:#eef1f5;--muted:#aab4c0;--line:#363e49;--accent:#86adff;--surface:#252d37;--yuanqi:#243641;--applock:#283345;--magnifier:#263c36;--cike:#292e39;--header:rgba(23,28,35,.95);color-scheme:dark}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:105px;scrollbar-gutter:stable}
body{margin:0;min-width:320px;background:var(--paper);color:var(--ink);-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;cursor:pointer;-webkit-tap-highlight-color:transparent}
img{display:block;max-width:100%;height:auto}
p,h1,h2,h3,h4,figure{margin:0}
h1,h2,h3{text-wrap:balance}
::selection{background:var(--accent);color:var(--paper)}
:focus-visible{outline:2px solid var(--accent);outline-offset:6px}
.page-width{width:min(100% - 96px,1320px);margin-inline:auto}
.skip-link{position:fixed;top:-60px;left:20px;z-index:20;background:var(--paper);padding:12px 20px;color:var(--accent)}
.skip-link:focus{top:10px}
.site-header{position:sticky;top:0;z-index:10;background:var(--header);backdrop-filter:blur(16px);border-bottom:1px solid var(--line)}
.header-inner{height:76px;display:flex;align-items:center;gap:28px}
.brand{display:flex;align-items:center;gap:15px;flex-shrink:0}
.brand-mark{font-size:29px;font-weight:750;letter-spacing:-.12em}
.brand-mark span{color:var(--accent)}
.brand-name{font-size:12px;font-weight:650;letter-spacing:.08em}
.main-nav{display:flex;align-items:center;gap:29px;margin-left:auto;font-size:14px;white-space:nowrap}
.main-nav a{display:flex;align-items:center;min-height:44px;transition:color .2s}
.main-nav a:hover,.main-nav a[aria-current]{color:var(--accent)}
.theme-toggle{font-size:12px;min-width:55px;min-height:44px;padding:8px 11px;background:transparent;border:1px solid var(--line);border-radius:999px}
.theme-toggle:hover{border-color:var(--accent)}
/* Portfolio cover inspired by isometric screen scenes, made with real app images.
   DESIGN_VARIANCE 8 / MOTION_INTENSITY 3 / VISUAL_DENSITY 5.
   Only the first viewport changes; the requested three-column case rows stay intact. */
.hero{position:relative;isolation:isolate;min-height:calc(100dvh - 76px);overflow:hidden;background:var(--paper)}
.hero-stage{position:absolute;inset:0;overflow:hidden;pointer-events:none;perspective:3000px;perspective-origin:55% 50%}
.hero-inner{position:relative;z-index:2;min-height:inherit;display:flex;align-items:center;padding-block:52px}
.hero-copy{min-width:0;width:min(100%,550px)}

.hero h1{font-size:clamp(56px,6.1vw,88px);line-height:1.17;letter-spacing:-.055em;font-weight:750}
.hero h1 span{color:var(--accent);white-space:nowrap}
.hero-description{font-size:17px;line-height:1.9;max-width:385px;margin-top:25px;color:var(--ink);text-wrap:pretty}
.primary-link{display:inline-flex;align-items:center;justify-content:center;background:var(--ink);color:var(--paper);font-size:14px;font-weight:600;padding:16px 24px;min-height:48px;border-radius:999px;margin-top:28px;white-space:nowrap;transition:background .2s,transform .2s}
.primary-link:hover{background:var(--accent)}
.primary-link:active{transform:scale(.98)}
.wall-plane{--screen-width:clamp(176px,16vw,252px);--wall-gap:26px;position:absolute;left:52%;top:46%;width:max-content;transform:translate(-50%,-50%) rotateX(25deg) rotateY(-10deg) rotateZ(-24deg);transform-origin:center;backface-visibility:hidden}
.wall-grid{display:grid;grid-template-columns:repeat(7,var(--screen-width));gap:var(--wall-gap);align-items:start}
.wall-column{display:flex;flex-direction:column;gap:var(--wall-gap)}
.wall-column:nth-child(2){transform:translateY(-90px)}
.wall-column:nth-child(3){transform:translateY(40px)}
.wall-column:nth-child(4){transform:translateY(-75px)}
.wall-column:nth-child(5){transform:translateY(65px)}
.wall-column:nth-child(6){transform:translateY(-60px)}
.wall-column:nth-child(7){transform:translateY(35px)}
.wall-screen{width:100%;aspect-ratio:1500/3248;position:relative;overflow:hidden;border-radius:20px;background:#f7f9fb;box-shadow:0 24px 34px -14px rgba(39,58,81,.22),0 2px 5px rgba(39,58,81,.09);outline:1px solid rgba(255,255,255,.6);outline-offset:-1px}
.wall-screen img{width:100%;height:auto;max-width:none}
.wall-android{aspect-ratio:1080/2308;background:#080808}
.wall-android img{position:absolute;inset:0 auto auto 0;transform:translateY(-3.833333%)}
/* Frame just the app area of the existing store artwork. Original assets stay unchanged. */
.wall-magnifier{aspect-ratio:330/669;background:#073a34}
.wall-magnifier img{position:absolute;left:-12.121212%;top:-31.988042%;width:123.636364%;height:auto}
/* Layered masks create a left-to-right focus falloff without duplicating the image wall.
   Blur radii remain static: no animated filter, no continuous background movement. */
.hero-blur{position:absolute;inset:0;z-index:1;-webkit-mask-image:linear-gradient(90deg,#000,transparent);mask-image:linear-gradient(90deg,#000,transparent)}
.hero-blur-soft{backdrop-filter:blur(5px);-webkit-backdrop-filter:blur(5px);-webkit-mask-image:linear-gradient(90deg,#000 0%,#000 38%,transparent 76%);mask-image:linear-gradient(90deg,#000 0%,#000 38%,transparent 76%)}
.hero-blur-near{backdrop-filter:blur(15px);-webkit-backdrop-filter:blur(15px);-webkit-mask-image:linear-gradient(90deg,#000 0%,#000 15%,transparent 60%);mask-image:linear-gradient(90deg,#000 0%,#000 15%,transparent 60%)}
.hero-haze{position:absolute;inset:0;z-index:1;background:linear-gradient(90deg,rgba(var(--hero-rgb),.99) 0%,rgba(var(--hero-rgb),.98) 20%,rgba(var(--hero-rgb),.94) 38%,rgba(var(--hero-rgb),.78) 46%,rgba(var(--hero-rgb),.16) 68%,rgba(var(--hero-rgb),0) 82%)}
.hero-floor{position:absolute;inset:0;z-index:1;background:linear-gradient(180deg,transparent 82%,var(--paper) 100%)}
.app-crop{position:relative;aspect-ratio:1080/2308;overflow:hidden;border-radius:16px;background:#080808}
.app-crop>img{position:absolute;top:0;left:0;width:100%;height:auto;max-width:none;transform:translateY(-3.833333%);border-radius:0}
/* Only the Android system status bar (92/2400) is hidden. Full app content remains. */
.work-section{padding-top:32px}
.projects-section,.second-internship{padding-top:76px}
.section-heading{display:flex;align-items:baseline;flex-wrap:wrap;gap:18px 32px;margin-bottom:30px}
.section-heading h2{font-size:34px;line-height:1.3;font-weight:650;letter-spacing:-.04em}
.company-heading .role-line{margin-left:auto}
.role-line{display:flex;flex-wrap:wrap;gap:10px 22px;color:var(--muted);font-size:14px;line-height:1.6}
.role-line>span:last-child{font-variant-numeric:tabular-nums}
.case-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:28px}
.case-project{min-width:0}
.project-art{height:320px;border-radius:20px;display:flex;align-items:center;justify-content:center;position:relative}
.yuanqi-art{background:var(--yuanqi)}
.applock-art{background:var(--applock)}
.magnifier-art{background:var(--magnifier)}


.art-group{height:82%;width:86%;display:flex;align-items:center;justify-content:center;gap:20px;min-width:0}
.art-group>img{width:auto;height:auto;max-height:100%;max-width:calc(50% - 10px);object-fit:contain;border-radius:14px;box-shadow:0 14px 28px -15px rgba(45,66,88,.2)}
.research-image{width:90%;height:82%;display:flex;align-items:center;justify-content:center}
.research-image img{width:auto;height:auto;max-width:100%;max-height:100%;object-fit:contain;border-radius:12px}
.project-info{padding:20px 0 0}
.project-heading{display:flex;align-items:baseline;flex-wrap:wrap;justify-content:space-between;gap:8px 12px}
.project-heading h3{font-size:24px;font-weight:650;letter-spacing:-.035em;line-height:1.4}
.project-heading h3 a{display:inline-block;transition:color .2s}
.project-heading h3 a:hover{color:var(--accent)}
.project-result{font-size:12px;line-height:1.6;color:var(--muted);white-space:nowrap}
.project-result strong{font-size:19px;color:var(--ink);margin-left:4px;font-weight:600;font-variant-numeric:tabular-nums}
.project-info>p{font-size:16px;line-height:1.85;color:var(--muted);margin-top:12px;text-wrap:pretty}
/* The project row uses the page surface, with no separate grey panels. */
.personal-projects .project-art{background:transparent;border:0;border-radius:0}
.personal-projects .cike-composition{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;width:100%;height:100%;max-width:390px;align-items:center}
.cike-screen{display:block;width:100%;max-width:120px;justify-self:center;box-shadow:0 14px 28px -15px rgba(40,50,74,.2)}
.placeholder-art{background:var(--surface);border:1px dashed var(--line);text-align:center}
.placeholder-mark{font-size:76px;line-height:1;font-weight:500;letter-spacing:-.06em;color:var(--muted)}
.placeholder-art p{font-size:14px;line-height:1.8;color:var(--muted);margin-top:18px}
.internship-placeholder{display:flex;align-items:center;justify-content:center;min-height:180px;border:1px dashed var(--line);border-radius:20px;background:var(--surface)}
.internship-placeholder p{font-size:16px;line-height:1.8;color:var(--muted)}
.site-footer{margin-top:70px;border-top:1px solid var(--line);padding-top:25px;padding-bottom:28px}
.footer-bottom{display:flex;align-items:center;justify-content:space-between;gap:20px;flex-wrap:wrap;font-size:12px;color:var(--muted)}
.footer-bottom a{display:inline-flex;align-items:center;min-height:44px}
.footer-bottom a:hover{color:var(--accent)}
@media(max-width:1279px){.page-width{width:calc(100% - 72px)}.hero h1{font-size:clamp(56px,6.1vw,78px)}.hero-copy{width:500px}.hero-description{max-width:350px}.wall-plane{left:54%;--wall-gap:22px}.project-art{height:300px}.case-grid{gap:24px}.project-heading h3{font-size:23px}.art-group{gap:16px}.art-group>img{max-width:calc(50% - 8px)}}
@media(max-width:1023px){.header-inner{gap:18px}.brand-name{font-size:11px}.main-nav{gap:22px}.hero h1{font-size:clamp(48px,6vw,61px)}.hero-copy{width:390px}.hero-description{font-size:16px;max-width:310px}.wall-plane{left:56%;--screen-width:176px;--wall-gap:20px}.hero-haze{background:linear-gradient(90deg,rgba(var(--hero-rgb),.99) 0%,rgba(var(--hero-rgb),.98) 30%,rgba(var(--hero-rgb),.97) 44%,rgba(var(--hero-rgb),.94) 52%,rgba(var(--hero-rgb),.24) 76%,rgba(var(--hero-rgb),0) 94%)}.case-grid{gap:20px}.project-art{height:280px}.project-heading h3{font-size:22px}.project-result{font-size:12px}.project-result strong{font-size:18px}.art-group{gap:12px;width:88%}.art-group>img{max-width:calc(50% - 6px)}.section-heading h2{font-size:31px}.role-line{gap:8px 18px;font-size:13px}}
@media(min-width:768px) and (max-height:700px){.hero-inner{padding-block:32px}.hero h1{font-size:clamp(48px,5.4vw,72px)}.hero-description{margin-top:22px;font-size:16px}.primary-link{margin-top:24px}.wall-plane{--screen-width:clamp(170px,15vw,225px)}}
@media(min-width:768px) and (max-height:560px){.hero-inner{padding-block:24px}.hero h1{font-size:48px}.hero-description{font-size:15px;line-height:1.8;margin-top:18px}.primary-link{margin-top:20px;padding-block:12px}}
@media(max-width:767px){html{scroll-padding-top:85px}.page-width{width:calc(100% - 40px)}.header-inner{height:64px;gap:14px}.brand-name{display:none}.brand-mark{font-size:25px}.main-nav{gap:20px;font-size:13px}.main-nav .contact-link{display:none}.theme-toggle{min-width:46px;font-size:12px;padding:7px 9px}.hero{min-height:calc(100dvh - 64px)}.hero-inner{align-items:flex-start;padding-top:48px;padding-bottom:285px}.hero-copy{width:min(100%,430px)}.hero h1{font-size:clamp(44px,9.2vw,65px);line-height:1.2}.hero-description{max-width:310px;font-size:15px;line-height:1.8;margin-top:20px}.primary-link{font-size:14px;margin-top:24px;padding:14px 22px}.wall-plane{left:50%;top:62%;--screen-width:170px;--wall-gap:20px;transform:translate(-50%,-50%) rotateX(20deg) rotateY(-6deg) rotateZ(-24deg)}.hero-haze{background:linear-gradient(180deg,rgba(var(--hero-rgb),.99) 0%,rgba(var(--hero-rgb),.98) 32%,rgba(var(--hero-rgb),.97) 49%,rgba(var(--hero-rgb),.93) 55%,rgba(var(--hero-rgb),.35) 68%,rgba(var(--hero-rgb),0) 89%)}.hero-blur-soft{-webkit-mask-image:linear-gradient(180deg,#000 30%,transparent 72%);mask-image:linear-gradient(180deg,#000 30%,transparent 72%)}.hero-blur-near{-webkit-mask-image:linear-gradient(180deg,#000 0%,transparent 62%);mask-image:linear-gradient(180deg,#000 0%,transparent 62%)}.work-section{padding-top:28px}.projects-section,.second-internship{padding-top:52px}.section-heading{gap:14px;margin-bottom:24px}.section-heading h2{font-size:29px}.company-heading{display:block}.company-heading .role-line{margin-top:12px;justify-content:space-between}.role-line{font-size:13px;gap:8px 12px}.case-grid{grid-template-columns:1fr;gap:32px}.project-art{height:320px}.project-heading h3{font-size:24px}.project-result{font-size:12px}.project-result strong{font-size:20px}.project-info{padding-top:18px}.project-info>p{font-size:16px;margin-top:10px}.art-group{gap:24px;max-width:360px}.art-group>img{max-width:calc(50% - 12px)}.research-image{max-width:520px}.internship-placeholder{min-height:160px}.site-footer{margin-top:48px;padding-top:20px;padding-bottom:25px}.footer-bottom{gap:8px 20px;font-size:12px}.footer-email{width:100%}}
@media(max-width:389px){.page-width{width:calc(100% - 32px)}.main-nav{gap:18px}.header-inner{gap:12px}.hero h1{font-size:42px}.hero-inner{padding-top:40px;padding-bottom:260px}.project-art{height:300px}.project-heading h3{font-size:22px}.project-result{font-size:11px}.role-line{font-size:12px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{animation:none!important;transition:none!important}}
@media(prefers-reduced-transparency:reduce){.site-header{background:var(--paper);backdrop-filter:none}.hero-blur{display:none}.hero-haze{background:linear-gradient(90deg,var(--paper) 0%,var(--paper) 43%,rgba(var(--hero-rgb),.94) 52%,rgba(var(--hero-rgb),0) 78%)}}
@media(max-width:767px) and (prefers-reduced-transparency:reduce){.hero-haze{background:linear-gradient(180deg,var(--paper) 0%,var(--paper) 48%,rgba(var(--hero-rgb),.9) 56%,rgba(var(--hero-rgb),0) 88%)}}
@supports not ((backdrop-filter:blur(1px)) or (-webkit-backdrop-filter:blur(1px))){.hero-blur{display:none}}