/* ============================================================
   WhatsMyIPV — vanilla CSS, dark-first with light theme
   ============================================================ */

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

:root,
[data-theme="dark"]{
    --bg:#08080d;
    --surface:#101018;
    --surface-2:#181824;
    --surface-3:#20202e;
    --text:#e8e8f0;
    --text-dim:#8888a0;
    --text-muted:#55556a;
    --border:rgba(255,255,255,0.06);
    --border-strong:rgba(255,255,255,0.12);
    --accent:#6c5ce7;
    --accent-glow:#a78bfa;
    --accent-dark:#5a4bd6;
    --success:#00b894;
    --warning:#e17055;
    --danger:#ef4444;
    --transition:0.2s cubic-bezier(.25,.46,.45,.94);
}

[data-theme="light"]{
    --bg:#f5f5f7;
    --surface:#ffffff;
    --surface-2:#f0f0f4;
    --surface-3:#e6e6ec;
    --text:#1a1a2e;
    --text-dim:#555570;
    --text-muted:#8888a0;
    --border:rgba(0,0,0,0.08);
    --border-strong:rgba(0,0,0,0.16);
    --accent:#5b4cdb;
    --accent-glow:#6c5ce7;
    --accent-dark:#4a3bc0;
}

html{scroll-behavior:smooth;background:var(--bg);color:var(--text)}
body{font-family:'Inter',-apple-system,BlinkMacSystemFont,sans-serif;font-size:16px;line-height:1.6;-webkit-font-smoothing:antialiased;min-height:100vh;display:flex;flex-direction:column;position:relative}

/* Particle canvas — network/molecule background */
#particleCanvas{position:fixed;top:0;left:0;width:100vw;height:100vh;z-index:0;pointer-events:none;display:block}
.site-header,.app,.site-footer{position:relative;z-index:1}
@media(prefers-reduced-motion:reduce){#particleCanvas{display:none}}
a{color:var(--accent-glow);text-decoration:none}
a:hover{text-decoration:underline}
button{cursor:pointer;font-family:inherit}
input,select,textarea{font-family:inherit}
code{font-family:'JetBrains Mono',ui-monospace,monospace;font-size:.9em;padding:.1rem .35rem;background:var(--surface-2);border-radius:4px;color:var(--accent-glow)}

/* Header */
.site-header{display:flex;align-items:center;justify-content:space-between;padding:1.25rem 2rem;border-bottom:1px solid var(--border)}
.logo{font-size:1.25rem;font-weight:700;letter-spacing:-.5px;color:var(--text)}
.logo span{color:var(--accent)}
.icon-btn{background:none;border:1px solid var(--border);border-radius:8px;width:38px;height:38px;display:flex;align-items:center;justify-content:center;color:var(--text-dim);transition:all var(--transition)}
.icon-btn:hover{color:var(--text);border-color:var(--border-strong)}

/* Main app area */
.app{flex:1;max-width:1000px;width:100%;margin:0 auto;padding:2.5rem 1.5rem}

/* IP Hero */
.ip-hero{margin-bottom:3.5rem}
.hero-title{font-size:clamp(1.75rem,4vw,2.5rem);font-weight:700;letter-spacing:-.5px;margin-bottom:.5rem}
.hero-lede{color:var(--text-dim);font-size:.95rem;margin-bottom:2rem;max-width:620px}

.ip-grid{display:grid;grid-template-columns:1fr 1fr;gap:1rem;margin-bottom:1rem}
.ip-card{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:1.5rem;position:relative;transition:border-color var(--transition)}
.ip-card:hover{border-color:var(--border-strong)}
.ip-label{font-size:.7rem;font-weight:600;letter-spacing:.15em;text-transform:uppercase;color:var(--text-muted);margin-bottom:.6rem}
.ip-value{font-family:'JetBrains Mono',ui-monospace,monospace;font-size:clamp(1.1rem,3vw,1.5rem);font-weight:500;color:var(--text);word-break:break-all;min-height:1.5em;padding-right:4rem}
.ip-value.is-empty{color:var(--text-muted);font-style:italic;font-size:.95rem}
.copy-btn{position:absolute;top:1.25rem;right:1.25rem;padding:.35rem .75rem;font-size:.75rem;font-weight:600;background:var(--surface-2);color:var(--text-dim);border:1px solid var(--border);border-radius:6px;transition:all var(--transition)}
.copy-btn:hover{color:var(--text);border-color:var(--accent)}
.copy-btn.is-copied{color:var(--success);border-color:var(--success)}
.copy-btn:disabled{opacity:.4;cursor:not-allowed}

.ip-note{padding:1rem 1.25rem;background:rgba(225,112,85,.08);border:1px solid rgba(225,112,85,.2);border-radius:10px;color:var(--warning);font-size:.88rem;line-height:1.65;margin-bottom:2rem}

.info-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:1px;background:var(--border);border:1px solid var(--border);border-radius:12px;overflow:hidden;margin-top:2rem}
.info-item{background:var(--surface);padding:1rem 1.25rem}
.info-label{font-size:.7rem;font-weight:600;letter-spacing:.12em;text-transform:uppercase;color:var(--text-muted);margin-bottom:.3rem}
.info-value{font-size:.95rem;color:var(--text);font-weight:500;word-break:break-word}
.info-value.is-dim{color:var(--text-muted);font-weight:400}

/* Tools */
.tools{margin-bottom:3rem}
.section-title{font-size:clamp(1.35rem,3vw,1.75rem);font-weight:700;letter-spacing:-.3px;margin-bottom:1.25rem}

.tool-nav{display:flex;flex-wrap:wrap;gap:.25rem;padding:.4rem;background:var(--surface);border:1px solid var(--border);border-radius:10px;margin-bottom:1.5rem}
.tool-tab{background:transparent;border:none;color:var(--text-dim);font-size:.85rem;font-weight:500;padding:.55rem 1rem;border-radius:7px;transition:all var(--transition);white-space:nowrap}
.tool-tab:hover{color:var(--text);background:var(--surface-2)}
.tool-tab.is-active{color:var(--text);background:var(--surface-2);box-shadow:inset 0 -2px 0 var(--accent)}

.panel{display:none;animation:fadeIn .3s ease both}
.panel.is-active{display:block}
@keyframes fadeIn{from{opacity:0;transform:translateY(4px)}to{opacity:1;transform:none}}

.panel-lede{color:var(--text-dim);font-size:.9rem;line-height:1.7;margin-bottom:1.25rem;max-width:640px}

.tool-form{display:flex;gap:.5rem;margin-bottom:1.25rem;flex-wrap:wrap}
.tool-input{flex:1;min-width:200px;background:var(--surface);color:var(--text);border:1px solid var(--border);border-radius:8px;padding:.7rem 1rem;font-size:.95rem;font-family:'JetBrains Mono',ui-monospace,monospace;transition:border-color var(--transition)}
.tool-input:focus{outline:none;border-color:var(--accent)}

.btn-primary,.btn-secondary,.btn-ghost{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;padding:.7rem 1.5rem;border-radius:8px;font-size:.9rem;font-weight:600;border:none;cursor:pointer;transition:all var(--transition);white-space:nowrap}
.btn-primary{background:var(--accent);color:#fff}
.btn-primary:hover:not(:disabled){background:var(--accent-dark);transform:translateY(-1px);box-shadow:0 4px 14px rgba(108,92,231,.3)}
.btn-primary:disabled{opacity:.5;cursor:not-allowed;transform:none;box-shadow:none}
.btn-secondary{background:var(--surface-2);color:var(--text);border:1px solid var(--border)}
.btn-secondary:hover{background:var(--surface-3);border-color:var(--border-strong)}

/* Tool result */
.tool-result{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:1.5rem;overflow-x:auto}
.tool-result.is-error{border-color:rgba(239,68,68,.3);background:rgba(239,68,68,.05);color:var(--danger)}
.tool-result.is-loading{color:var(--text-dim);text-align:center;padding:2rem}

.result-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:1px;background:var(--border);border-radius:8px;overflow:hidden}
.result-row{background:var(--surface);padding:.85rem 1rem}
.result-label{font-size:.7rem;font-weight:600;letter-spacing:.12em;text-transform:uppercase;color:var(--text-muted);margin-bottom:.25rem}
.result-value{font-family:'JetBrains Mono',ui-monospace,monospace;font-size:.9rem;color:var(--text);word-break:break-word}
.result-section{margin-top:1.25rem}
.result-section:first-child{margin-top:0}
.result-section h4{font-size:.75rem;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--accent-glow);margin-bottom:.5rem}
.result-list{list-style:none}
.result-list li{font-family:'JetBrains Mono',ui-monospace,monospace;font-size:.88rem;padding:.4rem 0;border-bottom:1px solid var(--border);word-break:break-all}
.result-list li:last-child{border-bottom:none}

/* Footer */
.site-footer{padding:2.5rem 2rem;text-align:center;border-top:1px solid var(--border);color:var(--text-muted);font-size:.85rem;margin-top:auto}
.footer-line{margin-bottom:.5rem}
.footer-attribution{padding-top:1rem;background:linear-gradient(to right,transparent 35%,var(--border-strong) 35%,var(--border-strong) 65%,transparent 65%) top center / 100% 1px no-repeat;margin-top:.5rem}
.footer-attribution a{color:var(--accent-glow);font-weight:500}

/* Responsive */
@media(max-width:640px){
    .site-header{padding:1rem 1.25rem}
    .app{padding:2rem 1.25rem}
    .ip-grid{grid-template-columns:1fr}
    .tool-nav{overflow-x:auto;flex-wrap:nowrap}
    .tool-tab{font-size:.78rem;padding:.5rem .8rem}
    .site-footer{padding:2rem 1.25rem}
    .copy-btn{position:static;margin-top:.75rem;display:inline-flex}
    .ip-value{padding-right:0}
}