/* ========== Reset & Base ========== */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --bg:#f5f5f7;--bg2:#ffffff;--text:#1d1d1f;--text2:#6e6e73;
  --border:#d2d2d7;--card:#ffffff;--card-hover:#f0f0f3;
  --accent:#e63946;--accent2:#d62839;
  --sidebar-bg:#ffffff;--sidebar-w:260px;
  --header-h:64px;--radius:12px;--shadow:0 2px 12px rgba(0,0,0,.06);
}
[data-theme="dark"]{
  --bg:#0f0f1a;--bg2:#1a1a2e;--text:#e8e8ed;--text2:#8e8e9a;
  --border:#2a2a3e;--card:#1e1e32;--card-hover:#282845;
  --sidebar-bg:#16162b;--shadow:0 2px 12px rgba(0,0,0,.3);
}
html{font-size:16px;scroll-behavior:smooth}
body{font-family:'Noto Sans JP','Inter',system-ui,sans-serif;background:var(--bg);color:var(--text);line-height:1.6;min-height:100vh;transition:background .3s,color .3s}

/* ========== Auth Screen ========== */
#auth-screen[hidden]{display:none}
#auth-screen{display:flex;align-items:center;justify-content:center;min-height:100vh;background:linear-gradient(135deg,#0f0f1a 0%,#1a1a2e 50%,#16213e 100%);padding:20px}
.auth-container{text-align:center;max-width:400px;width:100%}
.auth-logo{display:flex;align-items:center;justify-content:center;gap:12px;margin-bottom:32px}
.auth-logo-mark{display:inline-flex;align-items:center;justify-content:center;width:56px;height:56px;background:var(--accent);color:#fff;font-family:'Inter',sans-serif;font-weight:900;font-size:28px;border-radius:14px}
.auth-logo-text{color:#fff;font-weight:900;font-size:24px;letter-spacing:-.02em}
.auth-logo-sub{display:block;font-size:12px;font-weight:400;color:#8e8e9a;letter-spacing:.08em}
.auth-desc{color:#8e8e9a;font-size:14px;margin-bottom:28px}
.auth-input-wrap{display:flex;gap:8px;max-width:320px;margin:0 auto}
.auth-input-wrap input{flex:1;padding:14px 18px;border:1px solid #2a2a3e;border-radius:10px;background:#1e1e32;color:#fff;font-size:16px;outline:none;transition:border-color .2s}
.auth-input-wrap input:focus{border-color:var(--accent)}
.auth-btn{padding:14px 20px;border:none;border-radius:10px;background:var(--accent);color:#fff;font-size:18px;font-weight:700;cursor:pointer;transition:background .2s}
.auth-btn:hover{background:var(--accent2)}
.auth-error{color:var(--accent);font-size:13px;margin-top:12px}

/* ========== Header ========== */
.header{position:fixed;top:0;left:0;right:0;height:var(--header-h);background:var(--bg2);border-bottom:1px solid var(--border);z-index:100;transition:background .3s,border-color .3s}
.header-inner{max-width:1600px;margin:0 auto;height:100%;display:flex;align-items:center;justify-content:space-between;padding:0 24px;gap:20px}
.header-logo{display:flex;align-items:center;gap:10px;flex-shrink:0}
.logo-mark{display:inline-flex;align-items:center;justify-content:center;width:40px;height:40px;background:var(--accent);color:#fff;font-family:'Inter',sans-serif;font-weight:900;font-size:20px;border-radius:10px}
.logo-text{font-weight:900;font-size:20px;letter-spacing:-.02em}
.logo-sub{display:block;font-size:10px;font-weight:400;color:var(--text2);letter-spacing:.08em}

/* ========== Search Bar ========== */
.header-search{flex:1;max-width:400px}
.search-wrap{position:relative;width:100%}
.search-wrap input{width:100%;padding:12px 40px 12px 16px;border:1px solid var(--border);border-radius:10px;background:var(--card);color:var(--text);font-size:14px;outline:none;transition:border-color .2s,box-shadow .2s}
.search-wrap input:focus{border-color:var(--accent);box-shadow:0 0 0 3px rgba(230,57,70,.1)}
.search-icon{position:absolute;right:12px;top:50%;transform:translateY(-50%);font-size:16px;color:var(--text2);pointer-events:none}

.header-actions{display:flex;align-items:center;gap:16px;flex-shrink:0}
.material-count{font-size:13px;color:var(--text2)}
.theme-toggle{background:none;border:1px solid var(--border);border-radius:8px;padding:6px 10px;cursor:pointer;font-size:16px;line-height:1;transition:border-color .2s}
.theme-toggle:hover{border-color:var(--accent)}
[data-theme="dark"] .theme-icon-light{display:none}
[data-theme="dark"] .theme-icon-dark{display:inline}
:root .theme-icon-dark{display:none}
:root .theme-icon-light{display:inline}

/* ========== Layout ========== */
.layout{display:flex;padding-top:var(--header-h)}

/* ========== Sidebar ========== */
.sidebar{position:fixed;top:var(--header-h);left:0;bottom:0;width:var(--sidebar-w);background:var(--sidebar-bg);border-right:1px solid var(--border);overflow-y:auto;padding:16px 12px;transition:background .3s,border-color .3s;z-index:50}
.sidebar-nav{display:flex;flex-direction:column;gap:4px}

/* Basic category button */
.cat-btn{display:flex;align-items:center;gap:8px;width:100%;padding:10px 14px;border:none;border-radius:8px;background:transparent;color:var(--text);font-size:14px;font-weight:500;cursor:pointer;text-align:left;transition:background .15s,color .15s}
.cat-btn:hover{background:var(--card-hover)}
.cat-btn.active{background:var(--accent);color:#fff;font-weight:700}

/* Accordion styles */
.accordion-group{margin:4px 0}
.accordion-header{display:flex;align-items:center;justify-content:space-between;width:100%;padding:10px 14px;border:none;border-radius:8px;background:transparent;color:var(--text);font-size:14px;font-weight:600;cursor:pointer;text-align:left;transition:background .15s,color .15s}
.accordion-header:hover{background:var(--card-hover)}
.accordion-header.expanded{background:rgba(230,57,70,.1);color:var(--accent)}

.accordion-icon{font-size:12px;transition:transform .2s ease;color:var(--text2)}
.accordion-header.expanded .accordion-icon{transform:rotate(90deg);color:var(--accent)}

.accordion-content{max-height:0;overflow:hidden;transition:max-height .3s ease;padding-left:8px}
.accordion-content.expanded{max-height:800px}

.sub-cat{font-size:13px;padding:8px 12px;margin:2px 0}
.sub-cat:hover{background:var(--card-hover)}
.sub-cat.active{background:var(--accent);color:#fff}

/* ========== Mobile Search ========== */
.mobile-search{display:none;position:fixed;top:var(--header-h);left:0;right:0;background:var(--bg2);border-bottom:1px solid var(--border);padding:12px 16px;z-index:50;transition:background .3s}
.mobile-search-wrap{position:relative;width:100%}
.mobile-search-wrap input{width:100%;padding:12px 40px 12px 16px;border:1px solid var(--border);border-radius:10px;background:var(--card);color:var(--text);font-size:14px;outline:none;transition:border-color .2s}
.mobile-search-wrap input:focus{border-color:var(--accent)}
.mobile-search-icon{position:absolute;right:12px;top:50%;transform:translateY(-50%);font-size:16px;color:var(--text2);pointer-events:none}

/* ========== Mobile Tabs ========== */
.mobile-tabs{display:none;position:fixed;top:calc(var(--header-h) + 48px);left:0;right:0;background:var(--bg2);border-bottom:1px solid var(--border);overflow-x:auto;white-space:nowrap;padding:8px 12px;z-index:50;-webkit-overflow-scrolling:touch;transition:background .3s}
.mob-tab,.mob-tab-group{display:inline-block;padding:8px 16px;border:1px solid var(--border);border-radius:20px;background:transparent;color:var(--text);font-size:13px;cursor:pointer;transition:all .15s;white-space:nowrap;margin-right:6px}
.mob-tab.active,.mob-tab-group.active{background:var(--accent);color:#fff;border-color:var(--accent);font-weight:700}

/* ========== Mobile Subcategories ========== */
.mobile-subcats{display:none;position:fixed;top:calc(var(--header-h) + 48px + 48px);left:0;right:0;background:var(--bg2);border-bottom:1px solid var(--border);z-index:50;transition:background .3s}
.mobile-subcat-group{display:none;padding:8px 12px;overflow-x:auto;white-space:nowrap;-webkit-overflow-scrolling:touch}
.mobile-subcat-group.active{display:block}
.mob-subcat{display:inline-block;padding:6px 12px;border:1px solid var(--border);border-radius:16px;background:transparent;color:var(--text);font-size:12px;cursor:pointer;transition:all .15s;white-space:nowrap;margin-right:4px}
.mob-subcat.active{background:var(--accent);color:#fff;border-color:var(--accent);font-weight:700}

/* ========== Content ========== */
.content{flex:1;margin-left:var(--sidebar-w);padding:24px;min-height:calc(100vh - var(--header-h))}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:20px}
.empty-msg{text-align:center;padding:80px 20px;color:var(--text2);font-size:15px}

/* ========== Card ========== */
.card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;transition:transform .2s,box-shadow .2s,background .3s,border-color .3s;cursor:default}
.card:hover{transform:translateY(-3px);box-shadow:var(--shadow)}
.card-thumb{position:relative;width:100%;padding-top:56.25%;background:#2a2a3e;overflow:hidden}
.card-thumb img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.card-thumb .placeholder{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;font-size:32px;color:var(--text2);background:linear-gradient(135deg,var(--card) 0%,var(--card-hover) 100%)}
.card-body{padding:14px 16px}
.card-name{font-size:13px;font-weight:700;margin-bottom:8px;line-height:1.4;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.card-id{font-size:11px;color:var(--text2);margin-bottom:8px;font-family:'Inter',monospace;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}

/* Tags */
.card-tags{display:flex;flex-wrap:wrap;gap:4px;margin-bottom:10px;min-height:20px}
.tag{display:inline-block;padding:2px 6px;border-radius:4px;background:rgba(230,57,70,.1);color:var(--accent);font-size:10px;font-weight:500;cursor:pointer;transition:background .2s}
.tag:hover{background:rgba(230,57,70,.2)}
[data-theme="dark"] .tag{background:rgba(230,57,70,.2);color:#ff6b7a}
[data-theme="dark"] .tag:hover{background:rgba(230,57,70,.3)}

.dl-btn{display:inline-flex;align-items:center;gap:6px;padding:8px 16px;border:none;border-radius:8px;background:var(--accent);color:#fff;font-size:12px;font-weight:700;text-decoration:none;cursor:pointer;transition:background .2s;width:100%;justify-content:center}
.dl-btn:hover{background:var(--accent2)}

/* ========== Responsive ========== */
@media(max-width:768px){
  .sidebar{display:none}
  .header-search{display:none}
  .mobile-search{display:block}
  .mobile-tabs{display:block}
  .mobile-subcats{display:block}
  .content{margin-left:0;padding:16px;padding-top:calc(48px + 48px + 48px + 16px)}
  .grid{grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:12px}
  .card-body{padding:10px 12px}
  .card-name{font-size:12px}
  .card-id{font-size:10px}
  .tag{font-size:9px;padding:1px 4px}
}

@media(max-width:480px){
  .grid{grid-template-columns:repeat(2,1fr);gap:10px}
  .header-inner{padding:0 12px}
  .logo-text{font-size:16px}
  .mobile-search{padding:8px 12px}
  .mobile-tabs{padding:6px 12px}
  .content{padding-top:calc(40px + 40px + 40px + 12px)}
}

/* ========== Animations ========== */
@keyframes fadeIn{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}
.card{animation:fadeIn .3s ease both}
.card:nth-child(2){animation-delay:.03s}
.card:nth-child(3){animation-delay:.06s}
.card:nth-child(4){animation-delay:.09s}
.card:nth-child(5){animation-delay:.12s}
.card:nth-child(6){animation-delay:.15s}

@keyframes slideDown{from{opacity:0;transform:translateY(-10px)}to{opacity:1;transform:translateY(0)}}
.mobile-subcat-group.active{animation:slideDown .2s ease}

/* scrollbar */
::-webkit-scrollbar{width:6px;height:6px}
::-webkit-scrollbar-track{background:transparent}
::-webkit-scrollbar-thumb{background:var(--border);border-radius:3px}