/* ═══════════════════════════════════════════════════════════════
   SPEEDPAW — PREMIUM SPEED-TEST APPLICATION STYLES (v0.2 SPA)
═══════════════════════════════════════════════════════════════ */

/* ── Design Tokens ──────────────────────────────────────────── */
:root {
    /* Base Palette */
    --bg:            #0b0f1a;
    --bg-panel:      #121826;
    --bg-card:       #1e2a3a;
    
    /* Brand & Accents */
    --accent:        #3b82f6;
    --accent-bright: #60a5fa;
    --accent-glow:   rgba(59,130,246,0.3);
    
    --color-purple:  #8b5cf6;
    --color-cyan:    #22d3ee;
    
    /* Text */
    --text-primary:  #f1f5f9;
    --text-secondary:#94a3b8;
    --text-muted:    #64748b;
    
    /* Semantic */
    --success:       #10b981;
    --warning:       #f59e0b;
    --danger:        #ef4444;

    /* Borders */
    --border:        rgba(255,255,255,0.06);
    --border-light:  rgba(255,255,255,0.12);

    /* Typography */
    --font-display:  'Outfit', sans-serif;
    --font-body:     'Inter', sans-serif;

    /* Layout */
    --header-h:      70px;
    --max-w:         1200px;

    /* Radius */
    --r-sm:  8px;
    --r-md:  12px;
    --r-lg:  16px;
    --r-xl:  24px;
}

[data-theme="light"] {
    --bg:            #f8fafc;
    --bg-panel:      #f1f5f9;
    --bg-card:       #ffffff;
    --text-primary:  #0f172a;
    --text-secondary:#334155;
    --text-muted:    #64748b;
    --border:        rgba(0,0,0,0.08);
    --border-light:  rgba(0,0,0,0.15);
}

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

html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-body);
    background: var(--bg);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

ul { list-style: none; }
a { text-decoration: none; color: inherit; }
button { background: none; border: none; font-family: inherit; cursor: pointer; color: inherit; }

.text-accent { color: var(--accent); }
.text-success { color: var(--success); }
.text-muted { color: var(--text-muted); }
.text-center { text-align: center; }
.mt-2 { margin-top: 1rem; }
.mt-4 { margin-top: 2rem; }
.mb-2 { margin-bottom: 1rem; }
.mx-auto { margin-left: auto; margin-right: auto; }

.mobile-only { display: none !important; }
@media (max-width: 900px) {
    .desktop-only { display: none !important; }
    .mobile-only { display: flex !important; }
    .mobile-only.block { display: block !important; }
}

/* ════════════════════════════════════════════════════════════════
   HEADER & NAVIGATION (Dropdowns)
════════════════════════════════════════════════════════════════ */
.header {
    height: var(--header-h);
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-inner {
    max-width: var(--max-w);
    margin: 0 auto;
    padding: 0 1.5rem;
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: -0.01em;
}

.header-nav {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-link {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 0.4rem;
    transition: color 0.2s;
    position: relative;
    padding: 0.5rem 0;
}

.nav-link:hover, .nav-dropdown:hover .dropbtn {
    color: var(--text-primary);
}

.nav-link.active {
    color: var(--text-primary);
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -15px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--accent);
    border-radius: 2px;
}

.disabled-link {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
}

/* Dropdown */
.nav-dropdown {
    position: relative;
    display: inline-block;
}

.dropdown-content {
    display: none;
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--bg-panel);
    min-width: 180px;
    box-shadow: 0px 8px 24px rgba(0,0,0,0.2);
    border: 1px solid var(--border);
    border-radius: var(--r-sm);
    z-index: 1;
    padding: 0.5rem 0;
}

.dropdown-content a {
    color: var(--text-secondary);
    padding: 0.75rem 1.25rem;
    text-decoration: none;
    display: block;
    font-size: 0.85rem;
    transition: background 0.2s, color 0.2s;
}

.dropdown-content a:hover {
    background-color: var(--bg-card);
    color: var(--text-primary);
}

.nav-dropdown:hover .dropdown-content {
    display: block;
    animation: fadeIn 0.2s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translate(-50%, -5px); }
    to { opacity: 1; transform: translate(-50%, 0); }
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.icon-btn {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: 1px solid var(--border);
    background: var(--bg-panel);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    transition: all 0.2s;
}

.icon-btn:hover { background: var(--bg-card); color: var(--text-primary); }
.icon-moon { display: none; }
[data-theme="light"] .icon-sun { display: none; }
[data-theme="light"] .icon-moon { display: block; }

/* ── Mobile & Collapsed Navigation Panel ── */
.header-nav.mobile-open {
    display: flex !important;
    flex-direction: column;
    align-items: stretch;
    position: fixed;
    top: var(--header-h);
    right: 1.5rem;
    width: 290px;
    max-width: calc(100vw - 3rem);
    max-height: calc(100vh - var(--header-h) - 1.5rem);
    overflow-y: auto;
    background: var(--bg-panel);
    border: 1px solid var(--border);
    border-radius: var(--r-md);
    box-shadow: 0 16px 36px rgba(0, 0, 0, 0.4);
    padding: 0.85rem;
    gap: 0.25rem;
    z-index: 1100;
    animation: fadeInMenu 0.18s ease;
}

@keyframes fadeInMenu {
    from { opacity: 0; transform: translateY(-6px); }
    to { opacity: 1; transform: translateY(0); }
}

.header-nav.mobile-open .nav-link {
    padding: 0.5rem 0.75rem;
    font-size: 0.9rem;
    border-radius: var(--r-sm);
    display: flex;
    align-items: center;
    width: 100%;
    color: var(--text-secondary);
}

.header-nav.mobile-open .nav-link:hover {
    background-color: var(--bg-card);
    color: var(--text-primary);
}

.header-nav.mobile-open .nav-link.active::after {
    display: none;
}

.header-nav.mobile-open .nav-link.active {
    background-color: rgba(59, 130, 246, 0.12);
    color: var(--accent-bright);
    font-weight: 600;
}

.header-nav.mobile-open .nav-dropdown {
    width: 100%;
    display: block;
}

.header-nav.mobile-open .dropbtn {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 600;
    color: var(--text-muted);
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 0.6rem 0.75rem 0.25rem 0.75rem;
    cursor: default;
}

.header-nav.mobile-open .dropbtn svg {
    display: none;
}

.header-nav.mobile-open .dropdown-content {
    display: block !important;
    position: static !important;
    transform: none !important;
    background: transparent !important;
    border: none !important;
    border-left: 2px solid var(--border-light) !important;
    box-shadow: none !important;
    min-width: unset !important;
    padding: 0.2rem 0 0.4rem 0.75rem !important;
    margin-left: 0.5rem !important;
    animation: none !important;
}

.header-nav.mobile-open .dropdown-content a {
    padding: 0.4rem 0.6rem;
    font-size: 0.85rem;
    color: var(--text-secondary);
    border-radius: var(--r-sm);
}

.header-nav.mobile-open .dropdown-content a:hover {
    background-color: var(--bg-card);
    color: var(--text-primary);
}

/* ════════════════════════════════════════════════════════════════
   MAIN APP ROUTER VIEWS
════════════════════════════════════════════════════════════════ */
.app {
    max-width: var(--max-w);
    margin: 0 auto;
    padding: 2rem 1.5rem;
}

/* Hide all sections by default, script.js handles displaying */
.view-section {
    animation: viewFade 0.3s ease;
}
@keyframes viewFade {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ════════════════════════════════════════════════════════════════
   SPEED TEST AREA
════════════════════════════════════════════════════════════════ */
.test-area {
    display: grid;
    grid-template-columns: 280px 1fr 260px;
    gap: 2rem;
    align-items: center;
}

/* ── LEFT PANEL ── */
.left-panel {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.hero-text h1 { font-family: var(--font-display); font-size: 2.5rem; line-height: 1.1; margin-bottom: 0.5rem; }
.hero-text p { color: var(--text-secondary); font-size: 1rem; }

.connection-quality-box {
    background: rgba(30, 42, 58, 0.4);
    border: 1px solid var(--border);
    border-radius: var(--r-lg);
    padding: 1.25rem;
    backdrop-filter: blur(12px);
    box-shadow: 0 4px 20px rgba(0,0,0,0.1);
}

.cq-header { display: flex; align-items: center; margin-bottom: 0.5rem; }
.cq-title { font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.05em; color: var(--text-muted); font-weight: 600; }
.cq-status { display: flex; align-items: center; gap: 0.75rem; margin-bottom: 0.5rem; }
.cq-value { font-family: var(--font-display); font-size: 1.25rem; font-weight: 700; color: var(--success); }
.cq-bars { display: flex; gap: 3px; }
.cq-bars .bar { width: 6px; height: 14px; background: var(--text-muted); border-radius: 2px; }
.cq-bars .bar.full { background: var(--success); }
.cq-desc { font-size: 0.85rem; color: var(--text-secondary); line-height: 1.4; }

.cq-meta {
    border-top: 1px solid var(--border);
    padding-top: 0.75rem;
    font-size: 0.75rem;
    color: var(--text-secondary);
}
.meta-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.25rem;
    gap: 0.5rem;
}
.meta-row span {
    flex-shrink: 0;
}
.meta-row strong {
    color: var(--text-primary);
    font-weight: 500;
    font-family: monospace;
    font-size: 0.8rem;
    /* Allow IPv6 addresses to wrap rather than silently truncate */
    max-width: 170px;
    overflow-wrap: anywhere;
    word-break: break-all;
    text-align: right;
    cursor: pointer;
    border-radius: 4px;
    padding: 1px 4px;
    transition: background 0.15s ease;
    line-height: 1.4;
}
.meta-row strong:hover {
    background: rgba(34, 211, 238, 0.1);
}

.gauge-needle {
    pointer-events: none;
    will-change: transform;
}


.ip-display-text {
    font-size: clamp(1.35rem, 3.5vw, 2.25rem);
    font-family: var(--font-display);
    line-height: 1.25;
    word-break: break-all;
    overflow-wrap: anywhere;
    max-width: 100%;
}

/* 3D Cat Mascot */
.cat-wrap {
    position: relative;
    width: 100%;
    max-width: 180px;
    margin: 0 auto;
    filter: drop-shadow(0 15px 30px rgba(0,0,0,0.5)) drop-shadow(0 5px 15px rgba(34,211,238,0.2));
    animation: catFloat 4s ease-in-out infinite;
}
@keyframes catFloat {
    0%,100% { transform: translateY(0); }
    50%      { transform: translateY(-8px); }
}
.cat-svg { width: 100%; height: auto; }

/* ── CENTER PANEL: GAUGE ── */
.gauge-panel {
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
}

.gauge-panel::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 400px;
    height: 400px;
    transform: translate(-50%, -50%);
    background: radial-gradient(circle, rgba(139,92,246,0.1) 0%, transparent 60%);
    z-index: -1;
    pointer-events: none;
}

.gauge-container {
    position: relative;
    width: 100%;
    max-width: 420px;
    aspect-ratio: 3/2;
}

.gauge-svg { width: 100%; height: 100%; overflow: visible; position: relative; z-index: 1; }
.gauge-readout {
    position: absolute;
    bottom: 5%;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    pointer-events: none;
    z-index: 10;
    text-align: center;
    width: 140px;
    max-width: 90%;
}
.speed-number {
    font-family: var(--font-display);
    font-size: clamp(2.2rem, 5vw, 3.2rem);
    font-weight: 800;
    line-height: 1;
    letter-spacing: -0.02em;
    color: var(--text-primary);
}
.speed-unit {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-top: 0.15rem;
}
.phase-text {
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    color: var(--text-muted);
    margin-top: 0.35rem;
    text-transform: uppercase;
}

.server-info-wrap { margin-top: 1rem; display: flex; justify-content: center; }
.server-status {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.8rem;
    background: rgba(30, 42, 58, 0.5);
    padding: 0.4rem 1rem;
    border-radius: 99px;
    border: 1px solid var(--border);
}
#server-status-text { color: var(--text-secondary); }
#server-location { font-weight: 600; color: var(--text-primary); }

.action-zone {
    margin-top: 2rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.primary-btn {
    background: linear-gradient(135deg, var(--accent), var(--color-purple));
    color: #fff;
    padding: 0.8rem 2.5rem;
    border-radius: 99px;
    font-size: 1rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    box-shadow: 0 4px 20px var(--accent-glow), inset 0 1px 0 rgba(255,255,255,0.2);
    transition: all 0.2s;
    border: 1px solid rgba(255,255,255,0.1);
}
.primary-btn:hover { transform: translateY(-2px); box-shadow: 0 6px 25px rgba(139,92,246,0.4), inset 0 1px 0 rgba(255,255,255,0.2); }
.primary-btn:disabled { opacity: 0.5; cursor: not-allowed; transform: none; box-shadow: none; }

.text-btn { font-size: 0.85rem; color: var(--text-secondary); display: flex; align-items: center; gap: 0.4rem; }
.text-btn:hover { color: var(--text-primary); }

.btn-icon-play { display: none; }
.btn-icon-refresh { display: none; }
.btn-icon-cancel { display: none; }
.primary-btn[data-mode="start"] .btn-icon-play { display: block; }
.primary-btn[data-mode="result"] .btn-icon-refresh { display: block; }
.primary-btn[data-mode="cancel"] .btn-icon-cancel { display: block; }

/* ── RIGHT PANEL: METRICS ── */
.right-panel { display: flex; flex-direction: column; gap: 1rem; }
.metric-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--r-md);
    padding: 1rem 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}
.metric-header { display: flex; align-items: center; gap: 0.5rem; }
.metric-icon-wrap { width: 28px; height: 28px; border-radius: 50%; display: flex; align-items: center; justify-content: center; }
.metric-icon-wrap.dl { background: rgba(59,130,246,0.15); color: var(--accent); }
.metric-icon-wrap.ul { background: rgba(139,92,246,0.15); color: var(--color-purple); }
.metric-icon-wrap.ping { background: rgba(245,158,11,0.15); color: var(--warning); }
.metric-icon-wrap.jitter { background: rgba(34,211,238,0.15); color: var(--color-cyan); }
.metric-lbl { font-size: 0.85rem; font-weight: 500; color: var(--text-secondary); }
.metric-val-row { display: flex; align-items: baseline; gap: 0.25rem; }
.metric-val { font-family: var(--font-display); font-size: 1.75rem; font-weight: 700; line-height: 1; }
.metric-unit { font-size: 0.8rem; color: var(--text-muted); }

/* Progress Bar */
.progress-bar-wrap { width: 100%; height: 4px; background: var(--bg-card); border-radius: 2px; overflow: hidden; max-width: 600px; margin: 2rem auto 0; }
.progress-bar { height: 100%; background: linear-gradient(90deg, var(--accent), var(--color-cyan)); width: 0%; transition: width 0.3s ease; }

/* ════════════════════════════════════════════════════════════════
   SMART RESULTS SECTION
════════════════════════════════════════════════════════════════ */
.smart-results-section {
    background: linear-gradient(180deg, var(--bg-panel) 0%, transparent 100%);
    border: 1px solid var(--border);
    border-radius: var(--r-xl);
    padding: 2rem;
    margin-bottom: 2rem;
}

.smart-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 1rem;
}

.smart-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--r-md);
    padding: 1.25rem;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

.smart-icon {
    color: var(--accent);
    margin-bottom: 0.5rem;
}

.smart-card h4 {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.smart-val {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 700;
}
.smart-val.excellent { color: var(--success); }
.smart-val.good { color: var(--accent); }
.smart-val.fair { color: var(--warning); }
.smart-val.poor { color: var(--danger); }

/* ════════════════════════════════════════════════════════════════
   VIDEO TEST & SCREEN RESOLUTION TOOLS
════════════════════════════════════════════════════════════════ */
.tool-card-wrap {
    max-width: 800px;
    margin: 0 auto;
}

.tool-card {
    background: var(--bg-panel);
    border: 1px solid var(--border);
    border-radius: var(--r-xl);
    padding: 3rem 2rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    box-shadow: 0 10px 30px rgba(0,0,0,0.15);
}

.tool-gauge {
    position: relative;
}
.video-icon {
    animation: pulseGlow 2s infinite;
}
@keyframes pulseGlow {
    0% { filter: drop-shadow(0 0 5px var(--accent)); }
    50% { filter: drop-shadow(0 0 15px var(--accent)); }
    100% { filter: drop-shadow(0 0 5px var(--accent)); }
}

.res-status {
    font-weight: 600;
}
.res-status.supported { color: var(--success); }
.res-status.unsupported { color: var(--danger); }
.res-status.testing { color: var(--accent); animation: flashText 1s infinite; }

@keyframes flashText {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* ════════════════════════════════════════════════════════════════
   ADS & INFO SECTIONS
════════════════════════════════════════════════════════════════ */
.ad-space {
    background: rgba(255,255,255,0.02);
    border: 1px dashed var(--border-light);
    border-radius: var(--r-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    font-size: 0.75rem;
    text-align: center;
    margin: 0 auto;
}
.ad-728 { width: 728px; height: 90px; }
.ad-300 { width: 300px; height: 50px; }

/* Info Grids */
.info-section { background: var(--bg-panel); border: 1px solid var(--border); border-radius: var(--r-xl); padding: 2rem; }
.section-title { font-family: var(--font-display); font-size: 1.25rem; font-weight: 600; margin-bottom: 1.5rem; }
.info-cards-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 1rem; }
.info-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--r-md); padding: 1.25rem 1rem; display: flex; flex-direction: column; align-items: center; text-align: center; gap: 0.75rem; transition: transform 0.2s; }
.info-card:hover { transform: translateY(-3px); }
.icon-circle { width: 40px; height: 40px; border-radius: 50%; display: flex; align-items: center; justify-content: center; }
.icon-circle.dl { background: rgba(59,130,246,0.1); color: var(--accent); }
.icon-circle.ul { background: rgba(139,92,246,0.1); color: var(--color-purple); }
.icon-circle.ping { background: rgba(245,158,11,0.1); color: var(--warning); }
.icon-circle.jitter { background: rgba(34,211,238,0.1); color: var(--color-cyan); }
.icon-circle.heart { background: rgba(239,68,68,0.1); color: var(--danger); }
.info-text h4 { font-size: 0.9rem; margin-bottom: 0.25rem; }
.info-text p { font-size: 0.75rem; color: var(--text-secondary); line-height: 1.4; }

/* Tables */
.details-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; }
.details-card { background: var(--bg-panel); border: 1px solid var(--border); border-radius: var(--r-lg); padding: 1.5rem; }
.details-card h3 { font-family: var(--font-display); font-size: 1rem; font-weight: 600; margin-bottom: 1rem; color: var(--text-primary); }
.data-table { width: 100%; border-collapse: collapse; font-size: 0.85rem; }
.data-table th { text-align: left; padding-bottom: 0.75rem; color: var(--text-muted); font-weight: 500; border-bottom: 1px solid var(--border); }
.data-table td { padding: 0.75rem 0; border-bottom: 1px solid var(--border); color: var(--text-secondary); }
.data-table tr:last-child td { border-bottom: none; }
.data-table td:last-child { text-align: right; font-weight: 500; color: var(--text-primary); }
.icon-table td:first-child { display: flex; align-items: center; gap: 0.5rem; }

.check-list { font-size: 0.85rem; color: var(--text-secondary); }
.check-list li { display: flex; align-items: center; gap: 0.5rem; padding: 0.6rem 0; border-bottom: 1px solid var(--border); }
.check-list li:last-child { border-bottom: none; }
.check-icon { color: var(--text-muted); flex-shrink: 0; }

/* Quick Guide */
.quick-guide-section { background: var(--bg-panel); border: 1px solid var(--border); border-radius: var(--r-md); padding: 1.25rem; }
.quick-guide-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 1rem; }
.accordion-item { display: flex; justify-content: space-between; align-items: center; padding: 1rem 0; border-bottom: 1px solid var(--border); font-size: 0.9rem; font-weight: 500; }
.accordion-item:last-child { border-bottom: none; }

.footer { text-align: center; padding: 1.5rem; font-size: 0.8rem; color: var(--text-muted); border-top: 1px solid var(--border); }

/* ════════════════════════════════════════════════════════════════
   RESPONSIVE DESIGN (360x800 to 1920x1080)
════════════════════════════════════════════════════════════════ */

/* Tablet (Max 1024px) */
@media (max-width: 1024px) {
    .test-area {
        grid-template-columns: 240px 1fr;
        grid-template-areas: "left center" "right right";
        gap: 1.5rem;
    }
    
    .left-panel { grid-area: left; }
    .gauge-panel { grid-area: center; }
    .right-panel { grid-area: right; flex-direction: row; flex-wrap: wrap; justify-content: center; }
    .metric-card { flex: 1; min-width: 150px; }
    
    .info-cards-grid { grid-template-columns: repeat(3, 1fr); }
    .details-grid { grid-template-columns: repeat(2, 1fr); }
    .smart-grid { grid-template-columns: repeat(3, 1fr); }
}

/* Mobile (Max 768px) */
@media (max-width: 768px) {
    .header-nav:not(.mobile-open) { display: none; }
    
    .header-nav.mobile-open {
        right: 0;
        left: 0;
        top: var(--header-h);
        width: 100%;
        max-width: 100%;
        max-height: calc(100vh - var(--header-h));
        border-radius: 0;
        border-left: none;
        border-right: none;
        border-top: none;
        border-bottom: 1px solid var(--border);
        box-shadow: 0 12px 28px rgba(0, 0, 0, 0.35);
        padding: 1rem 1.25rem 2rem 1.25rem;
    }
    
    .test-area {
        grid-template-columns: 1fr;
        grid-template-areas: "center" "left" "right";
        gap: 2rem;
    }
    
    .cat-wrap { max-width: 120px; }
    .gauge-container { max-width: 320px; }
    .speed-number { font-size: 3rem; }
    .gauge-readout { bottom: 5%; }
    
    .info-cards-grid { grid-template-columns: repeat(2, 1fr); }
    .details-grid { grid-template-columns: 1fr; }
    .smart-grid { grid-template-columns: repeat(2, 1fr); }
}

/* Small Mobile (Max 480px / 360x800, 375x667, 390x844, 430x932) */
@media (max-width: 480px) {
    .app { padding: 1rem; }
    .gauge-container { max-width: 290px; }
    .speed-number { font-size: 2.6rem; }
    .gauge-readout { bottom: 4%; }
    .info-cards-grid, .smart-grid { grid-template-columns: 1fr; }
    .metric-card { min-width: 130px; }
    
    .ad-728 { display: none !important; }
}

/* ════════════════════════════════════════════════════════════════
   MISSING UTILITIES & POLISH
════════════════════════════════════════════════════════════════ */

/* Mobile hero title (shown below cat on mobile) */
.mobile-hero-title {
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-secondary);
    line-height: 1.4;
}

/* Footer separators */
.footer-sep { margin: 0 0.5rem; opacity: 0.4; }
.footer-brand { font-family: var(--font-display); font-weight: 700; color: var(--text-primary); }
.footer-note { color: var(--text-muted); font-style: italic; }
.footer-copy { color: var(--text-muted); }

/* Light mode mascot: make dark-navy fills adapt slightly */
[data-theme="light"] .cat-svg .cat-head { filter: drop-shadow(0 2px 6px rgba(0,0,0,0.15)); }
[data-theme="light"] #eye-l-bg,
[data-theme="light"] #eye-r-bg { fill: #1e293b; }

/* Ensure header is positioned for dropdown */
.header { position: sticky; top: 0; }

/* Synchronized arc rendering with rAF needle animation */
#gauge-arc {
    will-change: stroke-dashoffset;
    transition: none;
}

/* Light mode gauge track */
[data-theme="light"] .gauge-track {
    stroke: rgba(0,0,0,0.08);
}

/* Server status pill in light mode */
[data-theme="light"] .server-status {
    background: rgba(241,245,249,0.9);
}

/* Metric cards in light mode */
[data-theme="light"] .metric-card {
    box-shadow: 0 2px 8px rgba(0,0,0,0.06);
}

/* Smart results section in light mode */
[data-theme="light"] .smart-results-section {
    background: linear-gradient(180deg, var(--bg-panel) 0%, transparent 100%);
}

/* Focus accessibility */
a:focus-visible,
button:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 3px;
    border-radius: 4px;
}

/* Video test: ensure full-width progress */
#vt-progress-wrap {
    width: 100%;
    max-width: 400px;
}

/* Disabled link styling */
.disabled-link {
    opacity: 0.45;
    cursor: not-allowed;
    pointer-events: none;
}

/* Connection quality box light mode */
[data-theme="light"] .connection-quality-box {
    background: rgba(255,255,255,0.8);
}

/* Align metric-card grid on mobile in right panel */
@media (max-width: 768px) {
    .right-panel {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 0.75rem;
    }
    .metric-card { min-width: unset; }
}

/* ════════════════════════════════════════════════════════════════
   HISTORY, TOOLS & EDUCATIONAL CONTENT STYLES
   (Preserves core design tokens and visual identity)
════════════════════════════════════════════════════════════════ */

/* History Table & Controls */
.history-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.history-actions {
    display: flex;
    gap: 0.75rem;
}

.btn-secondary {
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    color: var(--text-primary);
    padding: 0.5rem 1rem;
    border-radius: var(--r-sm);
    font-size: 0.85rem;
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    transition: all 0.2s;
}
.btn-secondary:hover {
    background: rgba(255,255,255,0.06);
    border-color: var(--accent);
}

.rating-badge {
    display: inline-block;
    padding: 0.2rem 0.6rem;
    border-radius: 99px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: capitalize;
}
.rating-badge.excellent { background: rgba(16,185,129,0.15); color: var(--success); }
.rating-badge.good      { background: rgba(59,130,246,0.15);  color: var(--accent); }
.rating-badge.average   { background: rgba(245,158,11,0.15);  color: var(--warning); }
.rating-badge.poor      { background: rgba(239,68,68,0.15);   color: var(--danger); }

.empty-state {
    text-align: center;
    padding: 3rem 1.5rem;
    color: var(--text-secondary);
}
.empty-state svg {
    margin-bottom: 1rem;
    opacity: 0.4;
}

/* Tool Grids */
.ping-stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1rem;
    width: 100%;
    margin-top: 1.5rem;
}
@media (max-width: 600px) {
    .ping-stats-grid { grid-template-columns: repeat(2, 1fr); }
}

.ip-info-box {
    width: 100%;
    max-width: 600px;
    margin: 0 auto;
    text-align: left;
}

/* Educational Guides & Legal Articles */
.article-container {
    max-width: 860px;
    margin: 0 auto;
    background: var(--bg-panel);
    border: 1px solid var(--border);
    border-radius: var(--r-xl);
    padding: 2.5rem;
}
@media (max-width: 768px) {
    .article-container { padding: 1.5rem; }
}

.article-header {
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--border);
}
.article-header h1 {
    font-family: var(--font-display);
    font-size: 2.2rem;
    line-height: 1.2;
    margin-bottom: 0.5rem;
}
.article-meta {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.article-body h2 {
    font-family: var(--font-display);
    font-size: 1.4rem;
    margin-top: 2rem;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}
.article-body h3 {
    font-family: var(--font-display);
    font-size: 1.1rem;
    margin-top: 1.5rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}
.article-body p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
    line-height: 1.7;
    font-size: 0.95rem;
}
.article-body ul, .article-body ol {
    margin-bottom: 1.25rem;
    padding-left: 1.5rem;
    color: var(--text-secondary);
}
.article-body li {
    margin-bottom: 0.5rem;
    line-height: 1.6;
    font-size: 0.95rem;
}

.callout-box {
    background: rgba(59,130,246,0.08);
    border-left: 4px solid var(--accent);
    padding: 1rem 1.25rem;
    border-radius: 0 var(--r-sm) var(--r-sm) 0;
    margin: 1.5rem 0;
}
.callout-box p {
    margin-bottom: 0;
    font-size: 0.9rem;
    color: var(--text-primary);
}

/* FAQ Accordion */
.faq-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}
.faq-item {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--r-md);
    overflow: hidden;
    transition: border-color 0.2s;
}
.faq-item[open] {
    border-color: var(--border-light);
}
.faq-summary {
    padding: 1rem 1.25rem;
    font-weight: 600;
    font-family: var(--font-display);
    cursor: pointer;
    list-style: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.faq-summary::-webkit-details-marker { display: none; }
.faq-summary::after {
    content: '+';
    font-size: 1.25rem;
    color: var(--accent);
    font-weight: 400;
}
.faq-item[open] .faq-summary::after {
    content: '−';
}
.faq-content {
    padding: 0 1.25rem 1.25rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.6;
}

/* Extended Footer Navigation */
.footer-links-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
    max-width: var(--max-w);
    margin: 0 auto 2rem;
    text-align: left;
    padding: 0 1.5rem;
}
@media (max-width: 768px) {
    .footer-links-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.5rem;
    }
}
@media (max-width: 480px) {
    .footer-links-grid {
        grid-template-columns: 1fr;
        text-align: center;
    }
}
.footer-col h5 {
    font-family: var(--font-display);
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
}
.footer-col ul {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}
.footer-col a {
    font-size: 0.8rem;
    color: var(--text-secondary);
    transition: color 0.2s;
}
.footer-col a:hover {
    color: var(--accent-bright);
}

/* ── Accordion ── */
.accordion {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}
.accordion-item {
    background: var(--bg-element);
    border: 1px solid var(--border);
    border-radius: 8px;
    overflow: hidden;
}
.accordion-header {
    padding: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    font-weight: 500;
    transition: background 0.2s;
}
.accordion-header:hover {
    background: var(--bg-hover);
}
.accordion-header svg {
    transition: transform 0.3s;
}
.accordion-item.active .accordion-header svg {
    transform: rotate(180deg);
}
.accordion-content {
    max-height: 0;
    overflow: hidden;
    padding: 0 1rem;
    color: var(--text-secondary);
    transition: max-height 0.3s ease, padding 0.3s ease;
}
.accordion-item.active .accordion-content {
    max-height: 200px;
    padding: 0 1rem 1rem 1rem;
}