/*
   IP TOOLS - EXPERT WEB TOOLS
*/

@font-face { font-family: 'Inter';       src: url('/fonts/inter-v20-latin-regular.woff2') format('woff2'); font-weight: 400; font-display: swap; }
@font-face { font-family: 'Orbitron';    src: url('/fonts/orbitron-v35-latin-700.woff2')  format('woff2'); font-weight: 700; font-display: swap; }
@font-face { font-family: 'Roboto Mono'; src: url('/fonts/roboto-mono-v31-latin-regular.woff2') format('woff2'); font-weight: 400; font-display: swap; }

/* Default Dark Theme Variables */
:root {
    --bg-dark:          #0a0a0f;
    --primary-accent:   #3b82f6;
    --secondary-accent: #8b5cf6;
    
    --text-main:        #f8fafc;
    --text-muted:       #94a3b8;
    
    --card-bg:          rgba(25, 25, 35, 0.6);
    --card-border:      rgba(255, 255, 255, 0.08);
    --input-bg:         rgba(255, 255, 255, 0.05);
    --input-text:       #ffffff;
    --table-border:     rgba(255, 255, 255, 0.05);
    
    --btn-hover-bg:     rgba(255, 255, 255, 0.05);
    --code-bg:          rgba(0, 0, 0, 0.4);
    --code-text:        #cbd5e1;
    --inline-code-bg:   rgba(255, 255, 255, 0.08);
    --inline-code-text: #93c5fd;

    --font-heading:     'Orbitron', sans-serif;
    --font-body:        'Inter', sans-serif;
    --font-code:        'Roboto Mono', monospace;
}

/* Light Theme Variables */
html.light-theme {
    --bg-dark:          #f8fafc;
    --text-main:        #0f172a;
    --text-muted:       #475569;
    
    --card-bg:          #ffffff;
    --card-border:      #cbd5e1;
    --input-bg:         #f1f5f9;
    --input-text:       #0f172a;
    --table-border:     #e2e8f0;
    
    --btn-hover-bg:     rgba(0, 0, 0, 0.05);
    --code-bg:          #e2e8f0;
    --code-text:        #0f172a;
    --inline-code-bg:   #e2e8f0;
    --inline-code-text: #2563eb;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html, body { width: 100%; }
/* STRICT CHROMIUM BUG FIX: transition background-color only */
html, body { transition: background-color 0.2s ease; background-color: var(--bg-dark); }
body { color: var(--text-main); font-family: var(--font-body); min-height: 100vh; display: flex; flex-direction: column; line-height: 1.6; overflow-x: hidden; -webkit-font-smoothing: antialiased; }

/* Accessibility Utilities */
.sr-only {
    position: absolute; width: 1px; height: 1px;
    padding: 0; margin: -1px; overflow: hidden;
    clip: rect(0,0,0,0); white-space: nowrap; border-width: 0;
}

.code-inline {
    font-family: var(--font-code);
    background: var(--inline-code-bg);
    padding: 1px 5px; border-radius: 4px;
    font-size: 0.9em; color: var(--inline-code-text);
}

.background-glow {
    position: fixed; top: -50%; left: -50%; width: 200%; height: 200%;
    background: radial-gradient(circle at center, rgba(59,130,246,0.08) 0%, rgba(10,10,15,0) 50%);
    z-index: -1; pointer-events: none;
}

/* Header */
.tool-header {
    display: flex; justify-content: space-between; align-items: center;
    padding: 1.5rem 5%; max-width: 1400px; margin: 0 auto; width: 100%; z-index: 10;
}
.back-btn {
    color: var(--text-muted); text-decoration: none;
    display: flex; align-items: center; gap: 8px;
    transition: color 0.3s; border-radius: 4px; padding: 2px 4px;
}
.back-btn:hover         { color: var(--primary-accent); }
.back-btn:focus-visible { outline: 2px solid var(--primary-accent); color: var(--primary-accent); }
.logo      { font-family: var(--font-heading); font-size: 1.2rem; }
.logo span { color: var(--primary-accent); }

/* Theme Toggle Button (Synchronized styling) */
.theme-toggle-btn { 
    background: var(--input-bg); border: 1px solid var(--card-border); 
    color: var(--text-main); width: 36px; height: 36px; border-radius: 8px; 
    cursor: pointer; display: flex; align-items: center; justify-content: center; 
    transition: all 0.2s ease; 
}
.theme-toggle-btn:hover { border-color: var(--primary-accent); color: var(--primary-accent); }

/* Main Layout */
.main-content   { flex-grow: 1; padding: 2rem 5%; max-width: 1000px; margin: 0 auto; width: 100%; }
.tool-container {
    background: var(--card-bg); border: 1px solid var(--card-border);
    border-radius: 16px; padding: 2rem;
    backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.15);
}
.tool-intro    { text-align: center; margin-bottom: 2rem; }
.tool-intro h1 { font-family: var(--font-heading); margin-bottom: 0.5rem; font-size: 2rem; color: var(--text-main); }
.tool-intro p  { color: var(--text-muted); }
.tool-intro .h1-ampersand { font-family: var(--font-body); font-weight: 300; }

/* Tabs */
.tabs-nav {
    display: flex; gap: 10px; margin-bottom: 2rem;
    border-bottom: 1px solid var(--card-border); padding-bottom: 1rem;
    overflow-x: auto; -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
}
.tabs-nav::-webkit-scrollbar { display: none; }

.tab-btn {
    background: transparent; border: none; color: var(--text-muted);
    padding: 10px 20px; font-family: var(--font-heading); font-size: 0.9rem;
    cursor: pointer; border-radius: 8px; transition: all 0.2s; white-space: nowrap;
    display: flex; align-items: center; gap: 8px;
}
.tab-btn:hover          { color: var(--text-main); background: var(--btn-hover-bg); }
.tab-btn.active         { background: var(--primary-accent); color: #fff; } /* Keep text white for contrast on blue */
.tab-btn:focus-visible  { outline: 2px solid var(--primary-accent); outline-offset: 2px; }

/* Tool Panes */
.tool-pane        { display: none; animation: fadeIn 0.3s ease; }
.tool-pane.active { display: block; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }

/* 1. IP Sorter */
.pane-grid      { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; }
.input-area,
.output-area    { display: flex; flex-direction: column; }
.area-header    { display: flex; justify-content: space-between; align-items: center; margin-bottom: 10px; }
.area-header label { font-size: 0.9rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 1px; font-weight: 600; }

.badge          { background: var(--btn-hover-bg); padding: 2px 8px; border-radius: 4px; font-size: 0.8rem; color: var(--text-main); border: 1px solid var(--card-border); }
.header-actions { display: flex; gap: 10px; }

textarea {
    flex: 1; background: var(--input-bg); border: 1px solid var(--card-border);
    color: var(--input-text); padding: 1rem; border-radius: 8px;
    font-family: var(--font-code); font-size: 0.9rem;
    resize: vertical; min-height: 300px; outline: none;
    line-height: 1.5; white-space: pre; overflow-x: auto;
    transition: border-color 0.2s, background 0.2s, color 0.2s;
}
textarea:focus         { border-color: var(--primary-accent); box-shadow: 0 0 0 3px rgba(59,130,246,0.1); }
textarea:focus-visible { outline: none; }

.controls { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-top: 1rem; }

.tool-btn {
    background: transparent; border: 1px solid var(--card-border);
    color: var(--text-muted); padding: 10px; border-radius: 6px;
    cursor: pointer; font-size: 0.9rem; font-family: var(--font-body);
    transition: all 0.2s; display: flex; align-items: center; justify-content: center; gap: 6px;
}
.tool-btn:hover          { border-color: var(--primary-accent); color: var(--primary-accent); background: rgba(59,130,246,0.05); }
.tool-btn.danger:hover   { border-color: #ef4444; color: #ef4444; background: rgba(239,68,68,0.05); }
.tool-btn:focus-visible  { outline: 2px solid var(--primary-accent); outline-offset: 2px; }

.icon-btn {
    background: transparent; border: none; color: var(--text-muted);
    cursor: pointer; transition: color 0.2s; font-size: 1.1rem;
    min-width: 44px; min-height: 44px;
    display: flex; align-items: center; justify-content: center;
    border-radius: 6px;
}
.icon-btn:hover         { color: var(--text-main); }
.icon-btn:focus-visible { outline: 2px solid var(--primary-accent); }

/* 2. Calculator */
.calc-wrapper { max-width: 800px; margin: 0 auto; }
.input-group label { display: block; margin-bottom: 10px; color: var(--text-muted); font-size: 0.9rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.5px; }
.input-row { display: flex; gap: 10px; }
.input-row input {
    flex: 1; background: var(--input-bg); border: 1px solid var(--card-border);
    padding: 12px 15px; border-radius: 8px; color: var(--input-text);
    font-family: var(--font-code); outline: none; font-size: 1rem;
    transition: border-color 0.2s, background 0.2s, color 0.2s;
    min-height: 46px;
}
.input-row input:focus         { border-color: var(--primary-accent); box-shadow: 0 0 0 3px rgba(59,130,246,0.1); }
.input-row input:focus-visible { outline: none; }

.primary-btn {
    background: var(--primary-accent); color: #fff; border: none;
    padding: 0 24px; border-radius: 8px; font-weight: 600;
    cursor: pointer; transition: background 0.2s; font-family: var(--font-body);
    min-height: 46px; white-space: nowrap;
}
.primary-btn:hover:not(:disabled) { background: #2563eb; }
.primary-btn:focus-visible        { outline: 2px solid var(--primary-accent); outline-offset: 2px; }

.secondary-btn {
    background: var(--input-bg); color: var(--text-main);
    border: 1px solid var(--card-border); padding: 8px 20px;
    border-radius: 6px; font-weight: 600; cursor: pointer;
    font-family: var(--font-body); transition: all 0.2s;
}
.secondary-btn:hover         { background: var(--btn-hover-bg); border-color: var(--text-muted); }
.secondary-btn:focus-visible { outline: 2px solid var(--primary-accent); }

/* Result Table */
.result-area {
    margin-top: 2rem; background: var(--input-bg);
    border-radius: 12px; border: 1px solid var(--card-border); overflow-x: auto;
}
.result-area table   { width: 100%; border-collapse: collapse; }
.result-area th,
.result-area td      { padding: 12px 1rem; border-bottom: 1px solid var(--table-border); text-align: left; }
.result-area th      { color: var(--text-muted); width: 35%; font-weight: 600; white-space: nowrap; vertical-align: top; }
.result-area td      { color: var(--text-main); font-family: var(--font-code); word-break: break-all; }
.result-area tr:last-child th,
.result-area tr:last-child td { border-bottom: none; }

.code-block  {
    background: var(--code-bg); padding: 4px 8px; border-radius: 4px;
    color: var(--code-text); font-size: 0.85rem; letter-spacing: 1px;
    display: inline-block; margin-top: 4px; font-family: var(--font-code);
}
.class-badge { display: inline-flex; align-items: center; padding: 2px 8px; border-radius: 4px; font-family: var(--font-body); font-size: 0.8rem; font-weight: 600; margin-right: 8px; }
.badge-pub   { background: rgba(59,130,246,0.1);  color: #3b82f6; border: 1px solid rgba(59,130,246,0.3); }
.badge-priv  { background: rgba(16,185,129,0.1);  color: #10b981; border: 1px solid rgba(16,185,129,0.3); }
.badge-warn  { background: rgba(245,158,11,0.1);  color: #f59e0b; border: 1px solid rgba(245,158,11,0.3); }

/* Subnet Splitter */
.subnet-splitter-area {
    margin-top: 2rem; background: var(--card-bg);
    border: 1px solid var(--primary-accent);
    border-radius: 12px; padding: 1.5rem;
}
.subnet-splitter-area h3 { font-family: var(--font-heading); font-size: 1.1rem; color: var(--primary-accent); margin-bottom: 1rem; }
.split-controls { display: flex; align-items: center; gap: 15px; margin-bottom: 1.5rem; flex-wrap: wrap; }
.split-controls label { color: var(--text-muted); font-size: 0.9rem; font-weight: 600; text-transform: uppercase; }
.split-controls select {
    background: var(--input-bg); border: 1px solid var(--card-border);
    color: var(--input-text); padding: 8px 12px; border-radius: 6px;
    outline: none; cursor: pointer; font-family: var(--font-code);
    transition: border-color 0.2s, background 0.2s, color 0.2s;
}
.split-controls select option  { background: var(--card-bg); color: var(--text-main); }
.split-controls select:focus-visible { outline: 2px solid var(--primary-accent); }

.split-results {
    max-height: 400px; overflow-y: auto; overflow-x: auto; width: 100%;
    border: 1px solid var(--card-border); border-radius: 8px;
    background: var(--input-bg);
    scrollbar-width: thin;
    scrollbar-color: var(--card-border) transparent;
}
.split-results::-webkit-scrollbar       { width: 5px; height: 5px; }
.split-results::-webkit-scrollbar-track { background: transparent; }
.split-results::-webkit-scrollbar-thumb { background: var(--card-border); border-radius: 3px; }

.split-table { width: 100%; border-collapse: collapse; font-family: var(--font-code); font-size: 0.85rem; text-align: left; }
.split-table th { background: var(--input-bg); color: var(--text-muted); padding: 10px; position: sticky; top: 0; z-index: 1; border-bottom: 1px solid var(--table-border); font-family: var(--font-body); }
.split-table td { padding: 8px 10px; border-bottom: 1px solid var(--table-border); color: var(--code-text); white-space: nowrap; }

/* Error / Warning */
.error-message   { padding: 1rem; color: #ef4444; text-align: center; background: rgba(239,68,68,0.1); border-radius: 0 0 12px 12px; }
.warning-message { padding: 1rem; color: #f59e0b; text-align: center; background: rgba(245,158,11,0.1); border-bottom: 1px solid var(--table-border); }

/* Toast */
.toast {
    position: fixed; bottom: 20px; left: 50%; transform: translateX(-50%);
    background: #1e1e24; border: 1px solid var(--primary-accent);
    color: #fff; padding: 10px 20px; border-radius: 8px;
    z-index: 2000; box-shadow: 0 4px 12px rgba(0,0,0,0.5);
    font-size: 0.9rem; white-space: normal; max-width: 90%; text-align: center;
    opacity: 0; pointer-events: none; transition: opacity 0.3s;
}
.toast.toast-visible { opacity: 1; pointer-events: auto; }
.hidden { display: none !important; }

/* Info Section */
.info-section    { margin-top: 4rem; padding: 0 1rem; }
.info-section h2 { font-family: var(--font-heading); color: var(--text-main); margin-bottom: 2rem; font-size: 1.5rem; text-align: center; }
.info-grid       { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 2rem; margin-bottom: 2rem; }
.info-grid h3    { color: var(--primary-accent); font-family: var(--font-heading); font-size: 1.1rem; margin-bottom: 0.5rem; }
.info-grid p     { color: var(--text-muted); font-size: 0.95rem; line-height: 1.6; }
.faq-container   { margin-top: 2rem; }
.faq-container h3 { font-family: var(--font-heading); color: var(--text-main); margin: 1.5rem 0 1rem; }
.faq-container h4 { color: var(--secondary-accent); font-size: 1rem; margin-bottom: 0.5rem; margin-top: 1.5rem; }
.faq-container p  { color: var(--text-muted); font-size: 0.95rem; margin-bottom: 1rem; line-height: 1.6; }

footer       { text-align: center; padding: 3rem 0; color: var(--text-muted); font-size: 0.9rem; border-top: 1px solid var(--card-border); margin-top: 3rem; transition: border-color 0.2s; }
footer a     { color: var(--text-main); text-decoration: none; font-weight: 500; }
footer a:hover { color: var(--primary-accent); }

/* === RESPONSIVE === */

@media (max-width: 900px) {
    .hide-mobile { display: none !important; }
}

@media (max-width: 768px) {
    .pane-grid     { grid-template-columns: 1fr; }
    textarea       { min-height: 200px; }
    .input-row     { flex-direction: column; }
    .primary-btn   { width: 100%; padding: 12px; justify-content: center; }
    .info-grid     { grid-template-columns: 1fr; }
    .split-controls { gap: 10px; }
    .split-controls select { width: 100%; }
}

@media (max-width: 480px) {
    .tool-header   { padding: 1rem; flex-direction: column; gap: 10px; }
    .main-content  { padding: 1rem; }
    .tool-container { padding: 1.25rem 1rem; }
    .tool-intro h1 { font-size: 1.5rem; }
    .tab-btn       { padding: 8px 14px; font-size: 0.8rem; }
    .controls      { grid-template-columns: 1fr 1fr; gap: 8px; }
    .tool-btn      { font-size: 0.8rem; padding: 8px; }
    textarea       { min-height: 160px; font-size: 0.85rem; }
    .result-area th,
    .result-area td { display: block; width: 100%; }
    .result-area th { padding-bottom: 2px; border-bottom: none; }
    .result-area td { padding-top: 2px; padding-bottom: 12px; }
    .split-table th,
    .split-table td { font-size: 0.75rem; padding: 6px 8px; }
}

@media (max-width: 400px) {
    .controls  { grid-template-columns: 1fr; }
    .tool-intro h1 { font-size: 1.2rem; }
    .tabs-nav  { gap: 6px; }
    .tab-btn   { padding: 8px 10px; font-size: 0.75rem; }
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration:  0.01ms !important;
        transition-duration: 0.01ms !important;
    }
}