/* ============================================
   DevKit HQ — Global Design System
   Dark-first, Apple × GitHub aesthetic
   ============================================ */

/* ----- CSS Variables ----- */
:root {
  /* Colors — dark */
  --bg: #0a0a0a;
  --bg-elevated: #111114;
  --bg-card: rgba(255,255,255,0.03);
  --border: rgba(255,255,255,0.06);
  --border-hover: rgba(255,255,255,0.12);
  --text: #e5e5e7;
  --text-secondary: #8e8e93;
  --text-tertiary: #636366;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --accent-glow: rgba(59,130,246,0.15);
  --green: #10b981;
  --green-bg: rgba(16,185,129,0.12);
  --amber: #f59e0b;
  --amber-bg: rgba(245,158,11,0.12);
  --red: #ef4444;
  --red-bg: rgba(239,68,68,0.12);

  /* Sizing */
  --radius-sm: 6px;
  --radius: 8px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-xl: 20px;
  --max-width: 1100px;
  --nav-height: 56px;

  /* Typography */
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, sans-serif;
  --font-mono: "SF Mono", "JetBrains Mono", "Fira Code", "Cascadia Code", monospace;
  --fs-xs: 11px;
  --fs-sm: 13px;
  --fs-base: 15px;
  --fs-md: 17px;
  --fs-lg: 20px;
  --fs-xl: 28px;
  --fs-2xl: 36px;
  --fs-3xl: 48px;
  --lh: 1.6;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
  --shadow: 0 4px 12px rgba(0,0,0,0.4);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.5);
  --ring: 0 0 0 1px rgba(255,255,255,0.1);

  /* Transitions */
  --ease: cubic-bezier(0.25, 0.1, 0.25, 1);
  --ease-out: cubic-bezier(0, 0, 0.58, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --dur: 0.2s;
  --dur-slow: 0.35s;
}

/* ----- Light theme override ----- */
[data-theme="light"] {
  --bg: #f5f5f7;
  --bg-elevated: #ffffff;
  --bg-card: rgba(0,0,0,0.02);
  --border: rgba(0,0,0,0.06);
  --border-hover: rgba(0,0,0,0.12);
  --text: #1d1d1f;
  --text-secondary: #6e6e73;
  --text-tertiary: #aeaeb2;
  --accent: #0071e3;
  --accent-hover: #0066cc;
  --accent-glow: rgba(0,113,227,0.1);
  --green: #00996b;
  --amber: #cc7d00;
  --red: #d91a1a;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.06);
  --shadow: 0 4px 16px rgba(0,0,0,0.08);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.12);
  --ring: 0 0 0 1px rgba(0,0,0,0.06);
}

/* ----- Reset ----- */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{font-family:var(--font);font-size:var(--fs-base);line-height:var(--lh);color:var(--text);background:var(--bg);min-height:100vh;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;transition:background var(--dur) var(--ease),color var(--dur) var(--ease)}
a{color:var(--accent);text-decoration:none}
img{max-width:100%;display:block}
button{cursor:pointer;font:inherit;color:inherit}
input,select,textarea{font:inherit;color:inherit}
::selection{background:var(--accent);color:#fff}

/* ----- Layout ----- */
.container{max-width:var(--max-width);margin:0 auto;padding:0 24px}
.page{padding:32px 0 80px;animation:fadeUp var(--dur-slow) var(--ease-out)}
.page-header{text-align:center;padding:48px 0 32px}
.page-header h1{font-size:var(--fs-3xl);font-weight:800;letter-spacing:-0.03em;line-height:1.1;margin-bottom:12px}
.page-header p{color:var(--text-secondary);font-size:var(--fs-md);max-width:520px;margin:0 auto}

/* ----- Nav ----- */
.nav{position:sticky;top:0;z-index:100;height:var(--nav-height);border-bottom:1px solid var(--border);background:rgba(10,10,10,0.72);backdrop-filter:blur(20px) saturate(180%);-webkit-backdrop-filter:blur(20px) saturate(180%);transition:background var(--dur) var(--ease),border-color var(--dur) var(--ease)}
[data-theme="light"] .nav{background:rgba(245,245,247,0.72)}
.nav-inner{max-width:var(--max-width);margin:0 auto;height:100%;display:flex;align-items:center;padding:0 24px;gap:24px}
.nav-logo{display:flex;align-items:center;gap:8px;font-weight:700;font-size:var(--fs-md);color:var(--text);text-decoration:none;flex-shrink:0}
.nav-logo svg{flex-shrink:0}
.nav-links{display:flex;gap:2px;flex:1}
.nav-link{padding:6px 14px;border-radius:var(--radius);font-size:var(--fs-sm);font-weight:500;color:var(--text-secondary);border:none;background:none;transition:all var(--dur) var(--ease)}
.nav-link:hover{color:var(--text);background:var(--bg-card)}
.nav-link.active{color:var(--accent);background:var(--accent-glow)}
.nav-right{display:flex;gap:6px;align-items:center}
.nav-icon{width:34px;height:34px;border:1px solid var(--border);border-radius:var(--radius);background:transparent;display:flex;align-items:center;justify-content:center;font-size:15px;transition:all var(--dur) var(--ease)}
.nav-icon:hover{border-color:var(--border-hover);background:var(--bg-card)}

/* ----- Buttons ----- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:10px 22px;border-radius:var(--radius-md);font-size:var(--fs-sm);font-weight:600;border:none;transition:all var(--dur) var(--ease);white-space:nowrap;user-select:none}
.btn:active{transform:scale(0.97)}
.btn-primary{background:var(--accent);color:#fff}
.btn-primary:hover{background:var(--accent-hover);box-shadow:0 4px 16px var(--accent-glow)}
.btn-secondary{background:var(--bg-card);border:1px solid var(--border);color:var(--text)}
.btn-secondary:hover{border-color:var(--border-hover);background:rgba(255,255,255,0.06)}
.btn-danger{background:var(--red-bg);color:var(--red);border:1px solid transparent}
.btn-danger:hover{background:var(--red);color:#fff}
.btn-ghost{background:transparent;color:var(--text-secondary)}
.btn-ghost:hover{color:var(--text);background:var(--bg-card)}
.btn-lg{padding:14px 28px;font-size:var(--fs-base);border-radius:var(--radius-lg)}
.btn-sm{padding:6px 14px;font-size:var(--fs-xs);border-radius:var(--radius-sm)}
.btn-icon{width:36px;height:36px;padding:0;border-radius:var(--radius)}
.btn:disabled{opacity:0.45;pointer-events:none}

/* ----- Cards ----- */
.card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);padding:24px;transition:all var(--dur) var(--ease)}
.card:hover{border-color:var(--border-hover);box-shadow:var(--ring)}
.card-clickable{cursor:pointer}
.card-clickable:hover{transform:translateY(-2px);border-color:var(--accent);box-shadow:0 8px 24px var(--accent-glow)}

/* ----- Form ----- */
.input{width:100%;padding:10px 14px;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);color:var(--text);font-size:var(--fs-sm);transition:all var(--dur) var(--ease)}
.input:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-glow)}
.input::placeholder{color:var(--text-tertiary)}
.input-mono{font-family:var(--font-mono);font-size:var(--fs-sm)}
textarea.input{resize:vertical;min-height:120px;line-height:1.5}
select.input{cursor:pointer;appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%238e8e93' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 12px center;padding-right:36px}
label{display:block;font-size:var(--fs-sm);font-weight:600;color:var(--text-secondary);margin-bottom:6px}
label .val{color:var(--accent);font-weight:700}

/* Range slider */
input[type="range"]{width:100%;height:4px;-webkit-appearance:none;background:var(--border);border-radius:2px;outline:none}
input[type="range"]::-webkit-slider-thumb{-webkit-appearance:none;width:18px;height:18px;border-radius:50%;background:var(--accent);cursor:pointer;border:2px solid var(--bg-elevated);box-shadow:0 1px 4px rgba(0,0,0,0.3);transition:transform var(--dur) var(--ease)}
input[type="range"]::-webkit-slider-thumb:hover{transform:scale(1.15)}

/* ----- Toast ----- */
.toast{position:fixed;bottom:80px;left:50%;transform:translateX(-50%);background:#2c2c2e;color:#fff;padding:10px 24px;border-radius:var(--radius-md);font-size:var(--fs-sm);opacity:0;transition:opacity var(--dur) var(--ease);pointer-events:none;z-index:999;box-shadow:var(--shadow-lg)}
.toast.show{opacity:1}

/* ----- Modal ----- */
.modal-overlay{position:fixed;inset:0;background:rgba(0,0,0,0.6);z-index:200;display:none;align-items:center;justify-content:center;padding:24px;backdrop-filter:blur(4px);-webkit-backdrop-filter:blur(4px)}
.modal-overlay.show{display:flex}
.modal{background:var(--bg-elevated);border:1px solid var(--border);border-radius:var(--radius-xl);max-width:640px;width:100%;max-height:90vh;overflow-y:auto;box-shadow:var(--shadow-lg);padding:28px;position:relative;animation:fadeUp var(--dur-slow) var(--ease-out)}
.modal-close{position:absolute;top:14px;right:14px;width:32px;height:32px;border-radius:50%;border:none;background:var(--bg-card);color:var(--text-secondary);cursor:pointer;display:flex;align-items:center;justify-content:center;font-size:16px;transition:all var(--dur) var(--ease)}
.modal-close:hover{background:var(--border);color:var(--text)}

/* ----- Hero (homepage) ----- */
.hero{text-align:center;padding:64px 0 48px}
.hero-badge{display:inline-block;padding:4px 12px;background:var(--accent-glow);color:var(--accent);border-radius:20px;font-size:var(--fs-xs);font-weight:600;margin-bottom:20px;letter-spacing:0.03em}
.hero h1{font-size:var(--fs-3xl);font-weight:800;letter-spacing:-0.04em;line-height:1.1;margin-bottom:16px}
.hero h1 span{background:linear-gradient(135deg,var(--accent),#06b6d4);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.hero p{color:var(--text-secondary);font-size:var(--fs-md);max-width:500px;margin:0 auto 32px;line-height:1.7}

/* ----- Tool Grid (homepage) ----- */
.section{padding:32px 0}
.section-title{font-size:var(--fs-lg);font-weight:700;margin-bottom:4px}
.section-sub{color:var(--text-secondary);font-size:var(--fs-sm);margin-bottom:24px}
.tool-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:12px}
.tool-card{display:flex;align-items:flex-start;gap:14px;padding:18px;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);cursor:pointer;transition:all var(--dur) var(--ease);text-decoration:none;color:inherit}
.tool-card:hover{border-color:var(--accent);background:rgba(59,130,246,0.04);transform:translateY(-2px);box-shadow:0 8px 24px var(--accent-glow)}
.tool-card-icon{flex-shrink:0;width:40px;height:40px;border-radius:var(--radius);background:var(--accent-glow);display:flex;align-items:center;justify-content:center;font-size:18px}
.tool-card-body{min-width:0}
.tool-card-body h3{font-size:var(--fs-sm);font-weight:600;margin-bottom:3px}
.tool-card-body p{font-size:var(--fs-xs);color:var(--text-secondary);line-height:1.5;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}

/* ----- Dropzone ----- */
.dropzone{background:var(--bg-card);border:2px dashed var(--border);border-radius:var(--radius-xl);padding:48px 24px;text-align:center;cursor:pointer;transition:all var(--dur) var(--ease)}
.dropzone:hover{border-color:var(--accent);background:rgba(59,130,246,0.03)}
.dropzone.dragover{border-color:var(--accent);background:var(--accent-glow)}
.dropzone-icon{margin-bottom:12px;opacity:0.7}
.dropzone-title{font-size:var(--fs-md);font-weight:600;margin-bottom:4px}
.dropzone-sub{color:var(--text-tertiary);font-size:var(--fs-sm);margin-bottom:18px}
.dropzone-info{font-size:var(--fs-xs);color:var(--text-tertiary);margin-top:14px}

/* ----- Progress Bar ----- */
.progress-bar{height:4px;background:var(--border);border-radius:2px;overflow:hidden;margin:12px 0}
.progress-fill{height:100%;background:linear-gradient(90deg,var(--accent),var(--green));border-radius:2px;transition:width 0.3s var(--ease);width:0}

/* ----- Utility ----- */
.flex{display:flex}
.flex-wrap{flex-wrap:wrap}
.items-center{align-items:center}
.justify-between{justify-content:space-between}
.gap-sm{gap:8px}
.gap{gap:12px}
.gap-md{gap:16px}
.gap-lg{gap:24px}
.mt-sm{margin-top:8px}
.mt{margin-top:16px}
.mt-md{margin-top:24px}
.mt-lg{margin-top:32px}
.mb{margin-bottom:16px}
.mb-lg{margin-bottom:32px}
.text-center{text-align:center}
.text-mono{font-family:var(--font-mono);font-size:var(--fs-sm)}
.text-secondary{color:var(--text-secondary)}
.text-accent{color:var(--accent)}
.text-green{color:var(--green)}
.text-amber{color:var(--amber)}
.text-red{color:var(--red)}
.truncate{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.hidden{display:none}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap}

/* ----- Footer ----- */
.footer{text-align:center;padding:24px;color:var(--text-tertiary);font-size:var(--fs-xs);border-top:1px solid var(--border)}
.footer a{color:var(--text-secondary)}
.footer a:hover{color:var(--text)}

/* ----- Rich Footer ----- */
.rich-footer{padding:64px 0 40px;border-top:1px solid var(--border)}
.rich-footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:40px;max-width:var(--max-width);margin:0 auto;padding:0 24px}
.rich-footer h4{font-size:var(--fs-sm);font-weight:700;margin-bottom:14px;color:var(--text)}
.rich-footer ul{list-style:none;padding:0}
.rich-footer li{margin-bottom:7px}
.rich-footer li a{color:var(--text-secondary);font-size:var(--fs-sm);transition:color var(--dur) var(--ease)}
.rich-footer li a:hover{color:var(--accent)}
.rich-footer .about p{color:var(--text-secondary);font-size:var(--fs-sm);line-height:1.7;margin-bottom:12px}
.rich-footer .about .footer-logo{display:flex;align-items:center;gap:8px;margin-bottom:14px}
.rich-footer-bottom{max-width:var(--max-width);margin:32px auto 0;padding:16px 24px 0;border-top:1px solid var(--border);display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:8px;font-size:var(--fs-xs);color:var(--text-tertiary)}
.rich-footer-bottom a{color:var(--text-tertiary)}
.rich-footer-bottom a:hover{color:var(--text)}

/* ----- Ad Slot ----- */
.ad-slot{max-width:720px;margin:24px auto;text-align:center}
.ad-placeholder{border:1px dashed var(--border);border-radius:var(--radius);padding:20px;color:var(--text-tertiary);font-size:var(--fs-xs);transition:border-color var(--dur) var(--ease)}
.ad-placeholder:hover{border-color:var(--text-tertiary)}

@media(max-width:768px){
  .rich-footer-grid{grid-template-columns:1fr 1fr;gap:28px}
}
@media(max-width:480px){
  .rich-footer-grid{grid-template-columns:1fr}
  .rich-footer-bottom{flex-direction:column;text-align:center}
}

/* ----- Code block (for JSON etc) ----- */
.code-block{background:#1a1a1e;border:1px solid var(--border);border-radius:var(--radius);padding:16px;font-family:var(--font-mono);font-size:var(--fs-sm);line-height:1.6;overflow-x:auto;white-space:pre-wrap;word-break:break-all;max-height:480px;overflow-y:auto}
[data-theme="light"] .code-block{background:#f0f0f2}

/* ----- Animations ----- */
@keyframes fadeUp{from{opacity:0;transform:translateY(12px)}to{opacity:1;transform:translateY(0)}}
@keyframes fadeIn{from{opacity:0}to{opacity:1}}
@keyframes scaleIn{from{opacity:0;transform:scale(0.95)}to{opacity:1;transform:scale(1)}}
@keyframes slideDown{from{opacity:0;transform:translateY(-8px)}to{opacity:1;transform:translateY(0)}}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:0.5}}

.anim-fadeUp{animation:fadeUp var(--dur-slow) var(--ease-out) both}
.anim-scaleIn{animation:scaleIn var(--dur-slow) var(--ease-spring) both}

/* Stagger children */
.stagger>*{animation:fadeUp var(--dur-slow) var(--ease-out) both}
.stagger>*:nth-child(1){animation-delay:0s}
.stagger>*:nth-child(2){animation-delay:0.04s}
.stagger>*:nth-child(3){animation-delay:0.08s}
.stagger>*:nth-child(4){animation-delay:0.12s}
.stagger>*:nth-child(5){animation-delay:0.16s}
.stagger>*:nth-child(6){animation-delay:0.2s}
.stagger>*:nth-child(7){animation-delay:0.24s}
.stagger>*:nth-child(8){animation-delay:0.28s}
.stagger>*:nth-child(9){animation-delay:0.32s}
.stagger>*:nth-child(10){animation-delay:0.36s}
.stagger>*:nth-child(11){animation-delay:0.4s}
.stagger>*:nth-child(12){animation-delay:0.44s}

/* ----- Responsive ----- */
@media(max-width:768px){
  :root{--fs-3xl:36px;--fs-2xl:28px;--fs-xl:22px}
  .nav-links{display:none}
  .tool-grid{grid-template-columns:1fr}
  .page-header{padding:32px 0 24px}
  .hero{padding:40px 0 32px}
  .container{padding:0 16px}
}
@media(max-width:480px){
  :root{--fs-3xl:28px;--nav-height:48px}
  .hero h1{font-size:var(--fs-2xl)}
  .modal{padding:20px;margin:12px}
}