:root {
  --bg: #f0f2f5;
  --surface: #ffffff;
  --surface2: #f8f9fa;
  --text: #2d3436;
  --text2: #636e72;
  --border: #dfe6e9;
  --shadow: 0 2px 12px rgba(0,0,0,.08);
  --shadow-hover: 0 8px 30px rgba(0,0,0,.12);
  --nav-bg: rgba(255,255,255,.85);
  --radius: 16px;
  --radius-sm: 10px;
  --transition: .3s cubic-bezier(.4,0,.2,1);
  --font: 'Segoe UI', system-ui, -apple-system, sans-serif;
}
[data-theme=dark] {
  --bg: #0f0f1a;
  --surface: #1a1a2e;
  --surface2: #16213e;
  --text: #eef0f6;
  --text2: #a0a4b8;
  --border: #2d2d44;
  --shadow: 0 2px 12px rgba(0,0,0,.3);
  --shadow-hover: 0 8px 30px rgba(0,0,0,.5);
  --nav-bg: rgba(15,15,26,.92);
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:var(--font);
  background:var(--bg);
  color:var(--text);
  line-height:1.6;
  transition:background var(--transition),color var(--transition);
  min-height:100vh;
}
a{color:inherit;text-decoration:none}
ul{list-style:none}
img{max-width:100%;display:block}

/* ── Navbar ── */
nav{
  position:sticky;top:0;z-index:100;
  background:var(--nav-bg);
  backdrop-filter:blur(20px);
  -webkit-backdrop-filter:blur(20px);
  border-bottom:1px solid var(--border);
  padding:0 24px;
  transition:background var(--transition);
}
.nav-inner{
  max-width:1200px;margin:0 auto;
  display:flex;align-items:center;
  justify-content:space-between;height:64px;
}
.logo{
  font-size:1.4rem;font-weight:800;
  background:linear-gradient(135deg,#6c5ce7,#fd79a8);
  -webkit-background-clip:text;
  -webkit-text-fill-color:transparent;
  background-clip:text;
  letter-spacing:-.5px;
}
.nav-links{display:flex;gap:4px;align-items:center}
.nav-links a{
  padding:8px 16px;border-radius:var(--radius-sm);
  font-size:.9rem;font-weight:500;color:var(--text2);
  transition:all var(--transition);
}
.nav-links a:hover,.nav-links a.active{
  background:var(--surface);color:var(--text);
  box-shadow:var(--shadow);
}
.theme-toggle,.menu-toggle{
  background:none;border:none;color:var(--text2);
  font-size:1.2rem;cursor:pointer;padding:8px;
  border-radius:var(--radius-sm);transition:all var(--transition);
}
.theme-toggle:hover,.menu-toggle:hover{
  background:var(--surface);color:var(--text);
}
.menu-toggle{display:none}

/* ── Hero ── */
.hero{
  text-align:center;padding:60px 24px 40px;
  max-width:800px;margin:0 auto;
}
.hero h1{
  font-size:clamp(1.8rem,5vw,3.2rem);
  font-weight:800;letter-spacing:-1px;
  background:linear-gradient(135deg,#6c5ce7,#e17055,#fdcb6e);
  -webkit-background-clip:text;
  -webkit-text-fill-color:transparent;
  background-clip:text;
}
.hero p{
  color:var(--text2);font-size:1.1rem;
  margin-top:12px;max-width:600px;margin-inline:auto;
}

/* ── Tool Grid ── */
.tool-grid{
  display:grid;
  grid-template-columns:repeat(auto-fill,minmax(280px,1fr));
  gap:20px;max-width:1200px;margin:0 auto;padding:0 24px 60px;
}
.all-tools-grid{
  grid-template-columns:repeat(auto-fill,minmax(220px,1fr));
  gap:12px;padding:0;
}
.tool-card{
  background:var(--surface);border-radius:var(--radius);
  padding:28px 24px;
  box-shadow:var(--shadow);
  border:1px solid var(--border);
  transition:all var(--transition);
  cursor:pointer;position:relative;overflow:hidden;
}
.tool-card:hover{
  transform:translateY(-4px);
  box-shadow:var(--shadow-hover);
  border-color:transparent;
}
.tool-card .icon{
  width:52px;height:52px;border-radius:14px;
  display:flex;align-items:center;justify-content:center;
  font-size:1.4rem;color:#fff;margin-bottom:16px;
}
.tool-card h3{font-size:1.15rem;margin-bottom:6px}
.tool-card p{color:var(--text2);font-size:.9rem;line-height:1.5}
.tool-card .arrow{
  position:absolute;top:20px;right:20px;
  color:var(--text2);font-size:.9rem;
  opacity:0;transform:translateX(-8px);
  transition:all var(--transition);
}
.tool-card:hover .arrow{opacity:1;transform:translateX(0)}

/* ── Page Header ── */
.page-header{
  text-align:center;padding:40px 24px 30px;
}
.page-header h1{font-size:clamp(1.5rem,4vw,2.4rem);font-weight:800}
.page-header p{color:var(--text2);margin-top:6px}

/* ── Tools Container ── */
.tools-container{
  max-width:1100px;margin:0 auto;padding:0 24px 60px;
  display:flex;flex-direction:column;gap:32px;
}
.tool-box{
  background:var(--surface);
  border-radius:var(--radius);
  padding:28px 30px;
  box-shadow:var(--shadow);
  border:1px solid var(--border);
}
.tool-box h2{font-size:1.2rem;margin-bottom:16px;display:flex;align-items:center;gap:10px}
.tool-box h2 .badge{
  font-size:.7rem;background:var(--text2);color:var(--surface);
  padding:2px 10px;border-radius:20px;font-weight:600;
}

/* ── Form Elements ── */
label{display:block;font-size:.85rem;font-weight:600;color:var(--text2);margin-bottom:6px}
textarea,input[type=text],input[type=number],input[type=url],input[type=date],input[type=color],input[type=file],select{
  width:100%;padding:12px 14px;
  background:var(--surface2);border:1.5px solid var(--border);
  border-radius:var(--radius-sm);color:var(--text);
  font-size:.95rem;font-family:var(--font);
  transition:all var(--transition);
  outline:none;
}
input[type=file]::file-selector-button {
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 8px 16px;
  border-radius: 6px;
  cursor: pointer;
  margin-right: 12px;
  font-weight: 600;
  transition: all var(--transition);
}
input[type=file]::file-selector-button:hover {
  background: var(--border);
}
textarea{min-height:120px;resize:vertical;font-family:monospace}
textarea:focus,input:focus,select:focus{border-color:#6c5ce7;box-shadow:0 0 0 3px rgba(108,92,231,.15)}
.input-group{display:flex;gap:10px;flex-wrap:wrap}
.input-group>*{flex:1;min-width:120px}
.btn{
  padding:10px 22px;border:none;border-radius:var(--radius-sm);
  font-size:.9rem;font-weight:600;cursor:pointer;
  transition:all var(--transition);display:inline-flex;
  align-items:center;gap:8px;
}
.btn-primary{background:#6c5ce7;color:#fff}
.btn-primary:hover{background:#5a4bd1;transform:translateY(-1px)}
.btn-secondary{background:var(--surface2);color:var(--text);border:1px solid var(--border)}
.btn-secondary:hover{background:var(--border)}
.btn-success{background:#00b894;color:#fff}
.btn-success:hover{background:#00a381}
.btn-danger{background:#e17055;color:#fff}
.btn-group{display:flex;gap:8px;flex-wrap:wrap;margin:10px 0}
.output{
  margin-top:12px;padding:14px;background:var(--surface2);
  border-radius:var(--radius-sm);border:1px solid var(--border);
  min-height:40px;font-size:.95rem;line-height:1.6;
  white-space:pre-wrap;word-break:break-all;
}
.output-box{display:flex;gap:10px;align-items:flex-start}
.output-box .output{flex:1}
.copy-btn{
  background:none;border:1px solid var(--border);
  color:var(--text2);cursor:pointer;padding:8px 12px;
  border-radius:var(--radius-sm);font-size:.85rem;
  transition:all var(--transition);white-space:nowrap;
}
.copy-btn:hover{background:var(--surface2);color:var(--text)}
.row{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:12px}
.row>*{flex:1;min-width:180px}
.tools-filter-row { align-items: flex-end; }

/* ── Calculator ── */
.calc-display{
  width:100%;padding:16px 18px;font-size:1.8rem;
  font-weight:700;text-align:right;
  background:var(--surface2);border:2px solid var(--border);
  border-radius:var(--radius-sm);color:var(--text);
  margin-bottom:12px;font-family:monospace;
}
.calc-grid{
  display:grid;grid-template-columns:repeat(4,1fr);gap:8px;
}
.calc-grid button{
  padding:16px;border:none;border-radius:var(--radius-sm);
  font-size:1.15rem;font-weight:600;cursor:pointer;
  background:var(--surface2);color:var(--text);
  transition:all var(--transition);
}
.calc-grid button:hover{background:var(--border)}
.calc-grid .op{background:#6c5ce7;color:#fff}
.calc-grid .op:hover{background:#5a4bd1}
.calc-grid .eq{background:#00b894;color:#fff}
.calc-grid .eq:hover{background:#00a381}
.calc-grid .clr{background:#e17055;color:#fff}
.calc-grid .clr:hover{background:#d16350}

/* ── Color Preview ── */
.color-preview{width:100%;height:80px;border-radius:var(--radius-sm);margin:10px 0;border:2px solid var(--border)}
.gradient-preview{width:100%;height:100px;border-radius:var(--radius-sm);margin:10px 0}

/* ── Timer / Stopwatch ── */
.timer-display{
  font-size:clamp(2.5rem,8vw,4.5rem);
  font-weight:800;font-family:monospace;
  text-align:center;padding:20px 0;
  letter-spacing:4px;
}

/* ── Category Section (Home) ── */
.cat-section{max-width:1200px;margin:0 auto;padding:0 24px 20px}
.cat-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:16px;flex-wrap:wrap;gap:10px}
.cat-header h2{font-size:1.3rem;display:flex;align-items:center;gap:10px}
.cat-header a{font-size:.85rem;color:var(--text2);transition:color var(--transition)}
.cat-header a:hover{color:var(--text)}

/* ── Search Section ── */
#searchInput{padding-left:40px;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='%23636e72'%3E%3Cpath d='M15.5 14h-.79l-.28-.27A6.471 6.471 0 0 0 16 9.5 6.5 6.5 0 1 0 9.5 16c1.61 0 3.09-.59 4.23-1.57l.27.28v.79l5 4.99L20.49 19l-4.99-5zm-6 0C7.01 14 5 11.99 5 9.5S7.01 5 9.5 5 14 7.01 14 9.5 11.99 14 9.5 14z'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:14px center;background-size:18px}

/* ── About / Contact ── */
.page-content{
  max-width:800px;margin:0 auto;padding:0 24px 60px;
}
.page-content h2{font-size:1.3rem;margin:28px 0 12px}
.page-content p{color:var(--text2);margin-bottom:12px;line-height:1.7}
.contact-form{background:var(--surface);padding:28px 30px;border-radius:var(--radius);box-shadow:var(--shadow);border:1px solid var(--border)}
.contact-form .row{margin-bottom:0}

/* ── Toast ── */
.toast{
  position:fixed;bottom:24px;right:24px;z-index:999;
  background:var(--surface);color:var(--text);
  padding:14px 22px;border-radius:var(--radius-sm);
  box-shadow:0 8px 30px rgba(0,0,0,.15);
  border:1px solid var(--border);
  font-size:.9rem;font-weight:500;
  transform:translateY(100px);opacity:0;
  transition:all var(--transition);
}
.toast.show{transform:translateY(0);opacity:1}

/* ── Footer ── */
footer{
  text-align:center;padding:32px 24px;
  border-top:1px solid var(--border);
  color:var(--text2);font-size:.85rem;
}

/* ── Responsive ── */
@media(max-width:768px){
  nav{padding:0 16px}
  .menu-toggle{display:block}
  .nav-links{
    position:fixed;top:64px;left:0;right:0;
    background:var(--nav-bg);backdrop-filter:blur(20px);
    flex-direction:column;padding:16px;gap:4px;
    border-bottom:1px solid var(--border);
    transform:translateY(-120%);opacity:0;
    transition:all var(--transition);pointer-events:none;
  }
  .nav-links.open{transform:translateY(0);opacity:1;pointer-events:auto}
  .nav-links a{width:100%;text-align:center;padding:12px}
  .tool-grid{grid-template-columns:1fr;padding:0 16px 40px}
  .tool-box{padding:20px 16px}
  .hero{padding:40px 16px 30px}
  .tools-container{padding:0 16px 40px}
  .row{flex-direction:column}
  .row>*{min-width:unset}
  .tools-filter-row { align-items: stretch; }
  #toolsGrid, .all-tools-grid { grid-template-columns: 1fr 1fr; }
}
@media(max-width:480px){
  .nav-inner{height:56px}
  .logo{font-size:1.15rem}
  .tool-card{padding:16px 12px}
  .tool-card .icon{width:36px;height:36px;font-size:1rem;margin-bottom:12px;border-radius:10px}
  .tool-card h3{font-size:.95rem;margin-bottom:4px}
  .tool-card p{font-size:.75rem}
  .tool-card .badge{font-size:.6rem}
  .calc-grid button{padding:12px;font-size:1rem}
  .input-group{flex-direction:column}
  .output-box{flex-direction:column}
  #toolsGrid, .all-tools-grid { grid-template-columns: 1fr 1fr; gap:12px; }
}