@import url('https://fonts.googleapis.com/css2?family=DM+Mono:ital,wght@0,300;0,400;0,500;1,400&family=Syne:wght@400;600;700;800&display=swap');

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:       #0d0f14;
  --surface:  #13161d;
  --border:   #1e2230;
  --border2:  #2a2f42;
  --text:     #e2e4ed;
  --muted:    #6b7194;
  --accent:   #5effa0;
  --accent2:  #ff6b6b;
  --accent3:  #6bb5ff;
  --mono:     'DM Mono', monospace;
  --display:  'Syne', sans-serif;
  --radius:   10px;
  --transition: 160ms ease;
  --header-bg: rgba(13,15,20,.92);
  --canvas-check1: #1a1d26;
  --canvas-check2: #13161d;
  --json-str: #f9c74f;
}

[data-theme="light"] {
  --bg:       #f5f6f8;
  --surface:  #ffffff;
  --border:   #e2e5ee;
  --border2:  #cdd1de;
  --text:     #1a1d2e;
  --muted:    #8b90a8;
  --accent:   #0daa5c;
  --accent2:  #e03c3c;
  --accent3:  #2478d4;
  --header-bg: rgba(245,246,248,.92);
  --canvas-check1: #e8eaf0;
  --canvas-check2: #f5f6f8;
  --json-str: #b45309;
}

html { scroll-behavior: smooth; }
body {
  background: var(--bg); color: var(--text); font-family: var(--mono);
  font-size: 14px; line-height: 1.6; min-height: 100vh;
  transition: background .2s ease, color .2s ease;
}

::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--surface); }
::-webkit-scrollbar-thumb { background: var(--border2); border-radius: 3px; }

/* HEADER */
header {
  position: sticky; top: 0; z-index: 100;
  background: var(--header-bg); backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: 0 2rem; display: flex; align-items: center; gap: 1.5rem; height: 56px;
}
.logo { font-family: var(--display); font-weight: 800; font-size: 1.15rem; color: var(--accent); letter-spacing: -.02em; white-space: nowrap; text-decoration: none; }
.logo span { color: var(--text); }
.logo em { font-style: normal; }
nav { display: flex; gap: 2px; overflow-x: auto; scrollbar-width: none; flex: 1; }
nav::-webkit-scrollbar { display: none; }
nav a { background: none; border: none; cursor: pointer; color: var(--muted); font-family: var(--mono); font-size: 12px; padding: 6px 12px; border-radius: 6px; white-space: nowrap; transition: color var(--transition), background var(--transition); text-decoration: none; display: inline-flex; align-items: center; }
nav a:hover { color: var(--text); background: var(--border); }
nav a.active { color: var(--accent); background: rgba(94,255,160,.1); }

.contact-btn { display: inline-flex; align-items: center; gap: 6px; background: none; border: 1px solid var(--border2); border-radius: 8px; color: var(--muted); font-family: var(--mono); font-size: 12px; padding: 6px 14px; cursor: pointer; white-space: nowrap; text-decoration: none; flex-shrink: 0; margin-left: auto; transition: border-color var(--transition), color var(--transition), background var(--transition); }
.contact-btn:hover { border-color: var(--accent3); color: var(--accent3); background: rgba(107,181,255,.06); }

.donate-btn { display: inline-flex; align-items: center; gap: 7px; background: none; border: 1px solid var(--border2); border-radius: 8px; color: var(--muted); font-family: var(--mono); font-size: 12px; padding: 6px 14px; cursor: pointer; white-space: nowrap; transition: border-color var(--transition), color var(--transition), background var(--transition); flex-shrink: 0; }
.donate-btn:hover { border-color: var(--accent); color: var(--accent); background: rgba(94,255,160,.06); }

/* LAYOUT */
.container { max-width: 1100px; margin: 0 auto; padding: 2.5rem 2rem; }

/* BREADCRUMB */
.breadcrumb { display: flex; align-items: center; gap: .5rem; font-size: 12px; color: var(--muted); margin-bottom: 1.5rem; }
.breadcrumb a { color: var(--muted); text-decoration: none; }
.breadcrumb a:hover { color: var(--accent); }
.breadcrumb span { color: var(--border2); }

/* TOOL PAGE HEADER */
.tool-page-header { margin-bottom: 2rem; }
.tool-page-title { font-family: var(--display); font-size: clamp(1.5rem, 3vw, 2.2rem); font-weight: 800; letter-spacing: -.03em; margin-bottom: .4rem; }
.tool-page-desc { color: var(--muted); font-size: 13px; max-width: 600px; }

/* PANEL */
.panel { background: var(--surface); border: 1px solid var(--border2); border-radius: var(--radius); overflow: hidden; }
.panel-header { padding: .9rem 1.5rem; border-bottom: 1px solid var(--border); display: flex; align-items: center; gap: .75rem; }
.panel-header .icon { font-size: 1.2rem; }
.panel-title { font-family: var(--display); font-weight: 700; font-size: .95rem; }
.panel-body { padding: 1.5rem; }

/* CONTROLS */
.row { display: flex; gap: .75rem; flex-wrap: wrap; margin-bottom: 1rem; align-items: flex-start; }
.col { display: flex; flex-direction: column; gap: .4rem; flex: 1; min-width: 200px; }
label { font-size: 11px; color: var(--muted); text-transform: uppercase; letter-spacing: .06em; }
textarea, input[type=text], input[type=number], select { width: 100%; background: var(--bg); border: 1px solid var(--border2); border-radius: 7px; color: var(--text); font-family: var(--mono); font-size: 13px; padding: 10px 12px; outline: none; transition: border-color var(--transition); resize: vertical; }
textarea:focus, input:focus, select:focus { border-color: var(--accent); }
textarea { min-height: 120px; }
select option { background: var(--surface); }

/* BUTTONS */
.btn { display: inline-flex; align-items: center; gap: 6px; background: var(--accent); color: #000; border: none; border-radius: 7px; font-family: var(--mono); font-size: 13px; font-weight: 500; padding: 9px 18px; cursor: pointer; transition: opacity var(--transition), transform var(--transition); white-space: nowrap; }
.btn:hover { opacity: .88; transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn-ghost { background: var(--border); color: var(--text); }
.btn-sm { padding: 6px 12px; font-size: 12px; }

/* OUTPUT */
.output { background: var(--bg); border: 1px solid var(--border2); border-radius: 7px; padding: 12px; font-family: var(--mono); font-size: 13px; white-space: pre-wrap; word-break: break-all; min-height: 60px; color: var(--accent); position: relative; line-height: 1.7; }
.output.error { color: var(--accent2); }
.output.neutral { color: var(--text); }
.copy-btn { position: absolute; top: 8px; right: 8px; background: var(--border2); border: none; border-radius: 5px; color: var(--muted); font-family: var(--mono); font-size: 11px; padding: 3px 8px; cursor: pointer; transition: color var(--transition), background var(--transition); }
.copy-btn:hover { color: var(--accent); background: var(--border); }

/* CHECKBOX */
.checkbox-row { display: flex; align-items: center; gap: 8px; cursor: pointer; user-select: none; }
.checkbox-row input[type=checkbox] { accent-color: var(--accent); width: 14px; height: 14px; cursor: pointer; }
.checkbox-row span { font-size: 12px; color: var(--text); }

/* STRENGTH BAR */
.strength-bar { height: 4px; border-radius: 2px; background: var(--border2); margin-top: 8px; overflow: hidden; }
.strength-fill { height: 100%; border-radius: 2px; transition: width .3s ease, background .3s ease; }

/* IMAGE */
.canvas-wrap { background: repeating-conic-gradient(var(--canvas-check1) 0% 25%, var(--canvas-check2) 0% 50%) 0 0 / 20px 20px; border-radius: 7px; border: 1px solid var(--border2); display: flex; align-items: center; justify-content: center; min-height: 200px; overflow: hidden; }
.canvas-wrap canvas { display: block; max-width: 100%; }
.dropzone { border: 2px dashed var(--border2); border-radius: 10px; padding: 3rem 2rem; text-align: center; color: var(--muted); cursor: pointer; transition: border-color var(--transition), color var(--transition); }
.dropzone:hover, .dropzone.dragover { border-color: var(--accent); color: var(--accent); }
.dropzone .dz-icon { font-size: 2rem; margin-bottom: .5rem; }
.dropzone p { font-size: 12px; }

/* MARKDOWN */
.md-split { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
@media (max-width: 700px) { .md-split { grid-template-columns: 1fr; } }
.md-preview { background: var(--bg); border: 1px solid var(--border2); border-radius: 7px; padding: 1rem 1.25rem; min-height: 300px; overflow-y: auto; font-family: Georgia, serif; font-size: 14px; line-height: 1.8; color: var(--text); }
.md-preview h1,.md-preview h2,.md-preview h3 { font-family: var(--display); color: var(--text); margin: 1rem 0 .4rem; line-height: 1.2; }
.md-preview h1 { font-size: 1.6rem; } .md-preview h2 { font-size: 1.25rem; }
.md-preview p { margin-bottom: .75rem; }
.md-preview code { background: var(--border); padding: 2px 6px; border-radius: 4px; font-family: var(--mono); font-size: .9em; color: var(--accent); }
.md-preview pre { background: var(--border); border-radius: 7px; padding: 1rem; margin-bottom: .75rem; overflow-x: auto; }
.md-preview pre code { background: none; padding: 0; }
.md-preview blockquote { border-left: 3px solid var(--accent); padding-left: 1rem; color: var(--muted); margin-bottom: .75rem; }
.md-preview a { color: var(--accent3); }
.md-preview ul,.md-preview ol { padding-left: 1.5rem; margin-bottom: .75rem; }
.md-preview table { width: 100%; border-collapse: collapse; margin-bottom: .75rem; }
.md-preview th,.md-preview td { border: 1px solid var(--border2); padding: 6px 10px; }
.md-preview th { background: var(--surface); }
.md-preview hr { border: none; border-top: 1px solid var(--border2); margin: 1rem 0; }

/* DIFF */
.diff-line { padding: 2px 8px; border-radius: 3px; font-family: var(--mono); font-size: 12px; line-height: 1.8; white-space: pre-wrap; word-break: break-all; }
.diff-add { background: rgba(94,255,160,.12); color: #5effa0; }
.diff-remove { background: rgba(255,107,107,.12); color: #ff6b6b; }
.diff-same { color: var(--muted); }

/* TIMESTAMP */
.ts-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: .75rem; }
.ts-card { background: var(--bg); border: 1px solid var(--border2); border-radius: 7px; padding: .75rem 1rem; }
.ts-card .ts-label { font-size: 10px; color: var(--muted); text-transform: uppercase; letter-spacing: .06em; margin-bottom: 4px; }
.ts-card .ts-val { font-size: 13px; color: var(--accent); word-break: break-all; }

/* JSON */
.json-key { color: var(--accent3); } .json-str { color: var(--json-str); } .json-num { color: var(--accent); } .json-bool { color: var(--accent2); } .json-null { color: var(--muted); }

/* JWT */
.jwt-part { border-radius: 7px; padding: .75rem 1rem; margin-bottom: .5rem; font-size: 12px; line-height: 1.8; border: 1px solid var(--border2); }
.jwt-part-header { background: rgba(107,181,255,.07); border-color: rgba(107,181,255,.2); }
.jwt-part-payload { background: rgba(94,255,160,.07); border-color: rgba(94,255,160,.2); }
.jwt-part-sig { background: rgba(255,107,107,.07); border-color: rgba(255,107,107,.15); }
.jwt-part-label { font-size: 10px; text-transform: uppercase; letter-spacing: .08em; margin-bottom: .4rem; font-weight: 500; }
.jwt-header-label { color: var(--accent3); } .jwt-payload-label { color: var(--accent); } .jwt-sig-label { color: var(--accent2); }
.jwt-token-display { font-size: 12px; line-height: 1.9; word-break: break-all; background: var(--bg); border: 1px solid var(--border2); border-radius: 7px; padding: .75rem 1rem; margin-bottom: 1rem; }
.jwt-h { color: var(--accent3); } .jwt-p { color: var(--accent); } .jwt-s { color: var(--accent2); } .jwt-dot { color: var(--muted); }
.jwt-status { display: inline-flex; align-items: center; gap: 6px; padding: 4px 10px; border-radius: 20px; font-size: 11px; font-weight: 500; margin-bottom: 1rem; }
.jwt-status.valid   { background: rgba(94,255,160,.1);  color: var(--accent);  border: 1px solid rgba(94,255,160,.2); }
.jwt-status.expired { background: rgba(255,107,107,.1); color: var(--accent2); border: 1px solid rgba(255,107,107,.2); }
.jwt-status.no-exp  { background: rgba(107,181,255,.1); color: var(--accent3); border: 1px solid rgba(107,181,255,.2); }
.jwt-claim-row { display: flex; gap: .5rem; align-items: baseline; padding: 4px 0; border-bottom: 1px solid var(--border); font-size: 12px; }
.jwt-claim-row:last-child { border-bottom: none; }
.jwt-claim-key { color: var(--accent3); min-width: 55px; flex-shrink: 0; }
.jwt-claim-val { color: var(--text); word-break: break-all; }
.jwt-claim-hint { color: var(--muted); font-size: 11px; margin-left: auto; white-space: nowrap; }

/* DONATE MODAL */
.donate-overlay { position: fixed; inset: 0; z-index: 1000; background: rgba(7,9,13,.75); backdrop-filter: blur(6px); display: flex; align-items: center; justify-content: center; padding: 1rem; animation: fadeIn .15s ease; }
@keyframes fadeIn { from { opacity:0 } to { opacity:1 } }
.donate-modal { background: var(--surface); border: 1px solid var(--border2); border-radius: 14px; padding: 2rem; width: 100%; max-width: 440px; animation: slideUp .2s ease; position: relative; }
@keyframes slideUp { from { opacity:0; transform:translateY(12px) } to { opacity:1; transform:translateY(0) } }
.donate-close { position: absolute; top: 1rem; right: 1rem; background: var(--border); border: none; border-radius: 6px; color: var(--muted); font-size: 16px; width: 28px; height: 28px; cursor: pointer; display: flex; align-items: center; justify-content: center; transition: color var(--transition), background var(--transition); }
.donate-close:hover { background: var(--border2); color: var(--text); }
.donate-title { font-family: var(--display); font-weight: 800; font-size: 1.2rem; margin-bottom: .3rem; }
.donate-subtitle { color: var(--muted); font-size: 12px; margin-bottom: 1.5rem; }
.donate-coin { background: var(--bg); border: 1px solid var(--border2); border-radius: 10px; padding: 1rem 1.1rem; margin-bottom: .75rem; }
.donate-coin-header { display: flex; align-items: center; gap: .5rem; margin-bottom: .6rem; }
.donate-coin-icon { font-size: 1.1rem; }
.donate-coin-name { font-family: var(--display); font-weight: 700; font-size: .85rem; }
.donate-coin-network { font-size: 10px; color: var(--muted); margin-left: auto; background: var(--border); padding: 2px 7px; border-radius: 10px; }
.donate-addr { font-size: 11.5px; word-break: break-all; line-height: 1.7; margin-bottom: .6rem; letter-spacing: .02em; }
.donate-addr.btc-color { color: #f7931a; }
.donate-addr.eth-color { color: #a78bfa; }
.donate-copy-btn { background: var(--border); border: none; border-radius: 6px; color: var(--muted); font-family: var(--mono); font-size: 11px; padding: 4px 12px; cursor: pointer; width: 100%; transition: background var(--transition), color var(--transition); }
.donate-copy-btn:hover { background: var(--border2); color: var(--text); }
.donate-copy-btn.copied { background: rgba(94,255,160,.15); color: var(--accent); }
.donate-note { margin-top: 1.25rem; font-size: 11px; color: var(--muted); text-align: center; line-height: 1.6; }

/* OTHER TOOLS SECTION */
.other-tools { margin-top: 3rem; }
.other-tools-title { font-family: var(--display); font-size: .85rem; font-weight: 700; color: var(--muted); text-transform: uppercase; letter-spacing: .08em; margin-bottom: 1rem; }
.other-tools-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: .6rem; }
.other-tool-link { background: var(--surface); border: 1px solid var(--border); border-radius: 8px; padding: .75rem 1rem; text-decoration: none; display: flex; align-items: center; gap: .6rem; transition: border-color var(--transition), transform var(--transition); }
.other-tool-link:hover { border-color: var(--border2); transform: translateY(-1px); }
.other-tool-link .ot-icon { font-size: 1rem; }
.other-tool-link .ot-name { font-size: 12px; color: var(--text); font-family: var(--display); font-weight: 600; }

/* THEME TOGGLE */
.theme-toggle {
  display: inline-flex; align-items: center; justify-content: center;
  width: 34px; height: 34px;
  background: none; border: 1px solid var(--border2);
  border-radius: 8px; cursor: pointer; flex-shrink: 0;
  color: var(--muted); font-size: 15px;
  transition: border-color var(--transition), color var(--transition), background var(--transition);
}
.theme-toggle:hover { border-color: var(--accent); color: var(--accent); background: rgba(94,255,160,.06); }
.theme-toggle .icon-sun  { display: none; }
.theme-toggle .icon-moon { display: block; }
[data-theme="light"] .theme-toggle .icon-sun  { display: block; }
[data-theme="light"] .theme-toggle .icon-moon { display: none; }

/* FOOTER */
footer { margin-top: 4rem; padding: 2rem; border-top: 1px solid var(--border); text-align: center; color: var(--muted); font-size: 11px; }
footer a { color: var(--muted); text-decoration: none; }

/* RESPONSIVE */
@media (max-width: 600px) {
  header { padding: 0 1rem; }
  .container { padding: 1.5rem 1rem; }
  .donate-btn .btn-label { display: none; }
  .contact-btn .btn-label { display: none; }
}