@import url('https://fonts.googleapis.com/css2?family=Bebas+Neue&family=DM+Sans:wght@300;400;500&family=DM+Mono:wght@400;500&display=swap');
  /* EVBM ÖZEL STİLLERİ */
  html { scroll-behavior: smooth; }
  /* Light mode (site temasına uyumlu) */
  :root {
    --bg: #f0f4f8;
    --bg2: #e8eef5;
    --bg3: #dde6f0;
    --surface: #ffffff;
    --surface2: #f4f7fb;
    --border: #d1dce8;
    --border2: #b8ccde;
    --text: #0f2030;
    --text2: #2e4a62;
    --text3: #5a7a92;
    --accent: #0070cc;
    --accent2: #0058a8;
    --green: #0a7c4e;
    --amber: #b45309;
    --red: #c53030;
    --coral: #b84020;
  }
  /* Dark mode */
  [data-theme="dark"] {
    --bg: #080c0f;
    --bg2: #0d1318;
    --bg3: #111820;
    --surface: #161e26;
    --surface2: #1c2730;
    --border: #1f2e3a;
    --border2: #2a3d4e;
    --text: #e8f0f5;
    --text2: #8ba3b4;
    --text3: #4e6a7a;
    --accent: #00d4ff;
    --accent2: #0098c4;
    --green: #00e5a0;
    --amber: #ffb800;
    --red: #ff4b4b;
    --coral: #ff6b35;
  }

  /* Sadece en dış alan açık gri */
  .evbm-outer {
    background: var(--bg);
    min-height: 90vh;
    padding: 0rem 0rem;
  }

  /* İçerik kutusu – siyah arka plan, yuvarlatılmış */
  .evbm-content {
    max-width: 1900px;
    margin: 0 auto;
    background: var(--surface);
    border-radius: 24px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.1);
    overflow: clip;
    position: relative;
    isolation: isolate;
  }

  /* Grid noise overlay (sadece içerik alanında) */
  .evbm-content::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
      linear-gradient(rgba(0,100,200,0.04) 1px, transparent 1px),
      linear-gradient(90deg, rgba(0,100,200,0.04) 1px, transparent 1px);
    background-size: 40px 40px;
    pointer-events: none;
    z-index: 0;
    border-radius: 24px;
  }
  @supports not (overflow: clip) {
    .evbm-content { overflow: hidden; }
  }
  /* Mobilde köşe keskinleştir, taşmayı engelle */
  @media (max-width: 768px) {
    .evbm-content { border-radius: 18px; }
    .evbm-content::before { border-radius: 18px; }
    .evbm-outer { padding: 0; }
  }


  :root .evbm-nav {
    background: rgba(240,244,248,0.95) !important;
    border-bottom: 1px solid var(--border);
  }
  [data-theme="dark"] .evbm-nav {
    background: rgba(8,12,15,0.92) !important;
  }
  /* Özel navbar */
  .evbm-nav {
    background: rgba(8,12,15,0.85); /* overridden in light mode */ 
    backdrop-filter: blur(12px);
    border-bottom: 1px solid #1f2e3a;
    padding: 0 2rem;
    min-height: 56px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 100;
    gap: 1rem;
    border-radius: 24px 24px 0 0;
  }

  /* Scroll-to-top butonu */
  .scroll-top {
    position: fixed;
    bottom: 1.5rem;
    right: 1.5rem;
    width: 40px;
    height: 40px;
    background: var(--surface2);
    border: 1px solid var(--border2);
    border-radius: 50%;
    color: var(--accent);
    font-size: 1.1rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transform: translateY(10px);
    transition: opacity 0.3s, transform 0.3s, background 0.2s;
    z-index: 200;
    text-decoration: none;
  }
  .scroll-top.visible {
    opacity: 1;
    transform: translateY(0);
  }
  .scroll-top:hover {
    background: rgba(0,212,255,0.1);
    border-color: var(--accent);
  }
  .evbm-nav .nav-logo {
    font-family: 'Bebas Neue', sans-serif;
    font-size: 1.4rem;
    letter-spacing: 0.15em;
    color: #00d4ff;
    flex-shrink: 0;
  }
  .nav-right {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-shrink: 0;
  }
  .evbm-nav ul {
    display: flex;
    gap: 2rem;
    list-style: none;
    margin: 0;
    padding: 0;
  }
  .evbm-nav ul li a {
    color: #8ba3b4;
    text-decoration: none;
    font-size: 0.78rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    transition: color 0.2s;
    font-weight: 400;
  }
  .evbm-nav ul li a:hover,
  .evbm-nav ul li a.nav-active {
    color: #00d4ff;
  }
  .evbm-nav ul li a.nav-active {
    position: relative;
  }
  .evbm-nav ul li a.nav-active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0; right: 0;
    height: 1px;
    background: var(--accent);
    border-radius: 1px;
  }

  /* HERO */
  .hero {
    position: relative;
    display: flex;
    align-items: center;
    padding: 2rem 4rem 3rem;
    overflow: hidden;
  }
  .hero-bg {
    position: absolute;
    inset: 0;
    background:
      radial-gradient(ellipse 80% 60% at 70% 50%, rgba(0,212,255,0.06) 0%, transparent 60%),
      radial-gradient(ellipse 40% 40% at 20% 80%, rgba(0,229,160,0.04) 0%, transparent 50%);
    pointer-events: none;
  }
  .hero-content { position: relative; max-width: 640px; }
  .hero-tag {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-family: 'DM Mono', monospace;
    font-size: 0.72rem;
    color: var(--accent);
    letter-spacing: 0.12em;
    text-transform: uppercase;
    margin-bottom: 1.5rem;
    opacity: 0;
    animation: fadeUp 0.6s ease forwards 0.2s;
  }
  .hero-tag::before {
    content: '';
    width: 24px; height: 1px;
    background: var(--accent);
  }
  .hero h1 {
    font-family: 'Bebas Neue', sans-serif;
    font-size: clamp(3.5rem, 8vw, 7rem);
    line-height: 0.95;
    letter-spacing: 0.02em;
    margin-bottom: 1.5rem;
    opacity: 0;
    animation: fadeUp 0.7s ease forwards 0.35s;
  }
  .hero h1 span { color: var(--accent); }
  .hero p {
    font-size: 1.05rem;
    color: var(--text2);
    max-width: 500px;
    margin-bottom: 2rem;
    opacity: 0;
    animation: fadeUp 0.7s ease forwards 0.5s;
  }
  .hero-stats {
    display: flex;
    gap: 2rem;
    opacity: 0;
    animation: fadeUp 0.7s ease forwards 0.65s;
  }
  .hero-stat strong {
    display: block;
    font-family: 'Bebas Neue', sans-serif;
    font-size: 2rem;
    color: var(--accent);
    line-height: 1;
  }
  .hero-stat span {
    font-size: 0.7rem;
    color: var(--text3);
    text-transform: uppercase;
    letter-spacing: 0.08em;
  }
  .hero-visual {
    position: absolute;
    right: 2rem;
    top: 50%;
    transform: translateY(-50%);
    opacity: 0;
    animation: fadeIn 1s ease forwards 0.8s;
  }

  /* Sections */
  section {
    position: relative;
    padding: 4rem 4rem;
    max-width: 1200px;
    margin: 0 auto;
  }
  .section-label {
    font-family: 'DM Mono', monospace;
    font-size: 0.7rem;
    color: var(--accent);
    letter-spacing: 0.15em;
    text-transform: uppercase;
    margin-bottom: 0.5rem;
  }
  .section-title {
    font-family: 'Bebas Neue', sans-serif;
    font-size: clamp(2rem, 4vw, 3.2rem);
    letter-spacing: 0.03em;
    line-height: 1;
    margin-bottom: 0.75rem;
  }
  .section-subtitle {
    font-size: 0.95rem;
    color: var(--text2);
    max-width: 580px;
    margin-bottom: 2.5rem;
  }
  .divider {
    width: 100%;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--border2), transparent);
    margin: 0 auto;
  }
  .card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 1.5rem;
    transition: border-color 0.25s, transform 0.25s;
  }
  .card:hover {
    border-color: var(--border2);
    transform: translateY(-2px);
  }
  .voltage-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    margin-top: 2rem;
  }
  .volt-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 2rem;
    position: relative;
    overflow: hidden;
    transition: border-color 0.25s;
  }
  .volt-card:hover { border-color: var(--border2); }
  .volt-card.v400::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 3px;
    background: var(--amber);
  }
  .volt-card.v800::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 3px;
    background: var(--accent);
  }
  .volt-number {
    font-family: 'Bebas Neue', sans-serif;
    font-size: 4rem;
    line-height: 1;
    margin-bottom: 0.25rem;
  }
  .volt-card.v400 .volt-number { color: var(--amber); }
  .volt-card.v800 .volt-number { color: var(--accent); }
  .volt-unit {
    font-family: 'DM Mono', monospace;
    font-size: 1rem;
    color: var(--text3);
    letter-spacing: 0.1em;
  }
  .volt-name {
    font-size: 1.1rem;
    font-weight: 400;
    margin-bottom: 1rem;
    color: var(--text);
  }
  .volt-specs {
    list-style: none;
    margin: 1.25rem 0;
  }
  .volt-specs li {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border);
    font-size: 0.85rem;
    color: var(--text2);
  }
  .volt-specs li span:last-child {
    font-family: 'DM Mono', monospace;
    font-size: 0.8rem;
    color: var(--text);
  }
  .brands {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    margin-top: 1rem;
  }
  .brand-tag {
    font-size: 0.72rem;
    padding: 3px 10px;
    border-radius: 2px;
    background: var(--bg3);
    color: var(--text2);
    border: 1px solid var(--border);
    font-family: 'DM Mono', monospace;
    letter-spacing: 0.05em;
  }
  .cell-types-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
    margin-top: 2rem;
  }
  .cell-type-card.full-width {
    grid-column: 1 / -1;
  }
  .cell-type-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 1.75rem;
    transition: border-color 0.25s, transform 0.25s;
    position: relative;
    overflow: hidden;
  }
  .cell-type-card:hover {
    border-color: var(--border2);
    transform: translateY(-3px);
  }
  .cell-name {
    font-family: 'Bebas Neue', sans-serif;
    font-size: 1.8rem;
    letter-spacing: 0.05em;
    margin-bottom: 0.25rem;
  }
  .cell-formula {
    font-family: 'DM Mono', monospace;
    font-size: 0.75rem;
    color: var(--text3);
    margin-bottom: 1rem;
  }
  .cell-desc {
    font-size: 0.85rem;
    color: var(--text2);
    line-height: 1.6;
    margin-bottom: 1.25rem;
  }
  .rating-bar {
    margin-bottom: 0.5rem;
  }
  .rating-label {
    display: flex;
    justify-content: space-between;
    font-size: 0.72rem;
    color: var(--text3);
    margin-bottom: 3px;
    font-family: 'DM Mono', monospace;
    text-transform: uppercase;
    letter-spacing: 0.06em;
  }
  .rating-track {
    height: 3px;
    background: var(--border);
    border-radius: 2px;
    overflow: hidden;
  }
  .rating-fill {
    height: 100%;
    border-radius: 2px;
    transition: width 1s ease;
  }
  .connection-tabs {
    display: flex;
    gap: 0;
    border-bottom: 1px solid var(--border);
    margin-bottom: 2rem;
  }
  .tab-btn {
    padding: 0.75rem 1.5rem;
    background: none;
    border: none;
    color: var(--text3);
    font-family: 'DM Sans', sans-serif;
    font-size: 0.85rem;
    cursor: pointer;
    transition: color 0.2s, border-color 0.2s;
    border-bottom: 2px solid transparent;
    margin-bottom: -1px;
    font-weight: 400;
    letter-spacing: 0.04em;
  }
  .tab-btn.active {
    color: var(--accent);
    border-bottom-color: var(--accent);
  }
  .tab-content { display: none; }
  .tab-content.active { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; align-items: start; }
  .connection-info h3 {
    font-family: 'Bebas Neue', sans-serif;
    font-size: 1.8rem;
    letter-spacing: 0.03em;
    margin-bottom: 0.75rem;
  }
  .connection-info p {
    font-size: 0.9rem;
    color: var(--text2);
    margin-bottom: 1rem;
    line-height: 1.7;
  }
  .formula-box {
    background: var(--bg2);
    border: 1px solid var(--border2);
    border-radius: 4px;
    padding: 1.25rem;
    font-family: 'DM Mono', monospace;
    margin: 1rem 0;
  }
  .formula-box .f-row {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.3rem 0;
    font-size: 0.85rem;
    color: var(--text);
  }
  .formula-box .f-label {
    color: var(--text3);
    min-width: 80px;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
  }
  .f-value { color: var(--accent); font-weight: 500; }
  .hierarchy-flow {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0;
    margin-top: 2rem;
    position: relative;
  }
  .hier-card {
    background: var(--surface);
    border: 1px solid var(--border);
    padding: 2rem;
    position: relative;
    transition: background 0.25s;
  }
  .hier-card:not(:last-child)::after {
    content: '→';
    position: absolute;
    right: -14px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--accent);
    font-size: 1.2rem;
    z-index: 1;
  }
  .hier-card:hover { background: var(--surface2); }
  .hier-num {
    font-family: 'Bebas Neue', sans-serif;
    font-size: 3.5rem;
    color: var(--border2);
    line-height: 1;
    margin-bottom: 0.5rem;
  }
  .hier-title {
    font-family: 'Bebas Neue', sans-serif;
    font-size: 1.6rem;
    letter-spacing: 0.05em;
    margin-bottom: 0.75rem;
    color: var(--accent);
  }
  .hier-desc {
    font-size: 0.85rem;
    color: var(--text2);
    line-height: 1.65;
    margin-bottom: 1.25rem;
  }
  .hier-detail {
    font-size: 0.78rem;
    color: var(--text3);
    font-family: 'DM Mono', monospace;
    line-height: 1.8;
  }
  .chem-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 2rem;
    font-size: 0.85rem;
  }
  .chem-table th {
    text-align: left;
    padding: 0.75rem 1rem;
    font-family: 'DM Mono', monospace;
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text3);
    border-bottom: 1px solid var(--border);
    font-weight: 400;
  }
  .chem-table td {
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--border);
    color: var(--text2);
    vertical-align: middle;
  }
  .chem-table tr:hover td { background: var(--surface); }
  .chem-table td:first-child {
    font-family: 'Bebas Neue', sans-serif;
    font-size: 1.3rem;
    color: var(--text);
    letter-spacing: 0.05em;
  }
  .star-rating {
    display: flex;
    gap: 2px;
  }
  .star {
    width: 8px; height: 8px;
    border-radius: 50%;
  }
  .star.on { background: var(--accent); }
  .star.off { background: var(--border2); }
  .badge {
    display: inline-block;
    font-family: 'DM Mono', monospace;
    font-size: 0.7rem;
    padding: 2px 8px;
    border-radius: 2px;
    text-transform: uppercase;
    letter-spacing: 0.08em;
  }
  .badge-green { background: rgba(0,229,160,0.12); color: var(--green); border: 1px solid rgba(0,229,160,0.25); }
  .badge-amber { background: rgba(255,184,0,0.12); color: var(--amber); border: 1px solid rgba(255,184,0,0.25); }
  .badge-red { background: rgba(255,75,75,0.12); color: var(--red); border: 1px solid rgba(255,75,75,0.25); }
  .badge-blue { background: rgba(0,212,255,0.12); color: var(--accent); border: 1px solid rgba(0,212,255,0.25); }
  .steps-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0;
    margin-top: 2rem;
    counter-reset: step;
  }
  .step-card {
    padding: 1.5rem;
    border: 1px solid var(--border);
    border-right: none;
    position: relative;
    counter-increment: step;
    transition: background 0.25s;
  }
  .step-card:last-child { border-right: 1px solid var(--border); }
  .step-card:hover { background: var(--surface); }
  .step-num {
    font-family: 'Bebas Neue', sans-serif;
    font-size: 3rem;
    color: var(--border2);
    line-height: 1;
    margin-bottom: 0.5rem;
  }
  .step-title {
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
    color: var(--text);
  }
  .step-desc {
    font-size: 0.8rem;
    color: var(--text3);
    line-height: 1.6;
  }
  .evbm-footer {
    border-top: 1px solid var(--border);
    padding: 2.5rem 4rem;
    text-align: center;
    color: var(--text3);
    font-size: 0.75rem;
    font-family: 'DM Mono', monospace;
    letter-spacing: 0.05em;
    background: transparent;
    clear: both;
  }

  @keyframes fadeUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
  }
  @keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
  }

  /* ── Katı Hal Batarya Stilleri ─────────────── */
  .ss-compare-grid {
    margin-top: 2rem;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }
  .ss-compare-header {
    margin-bottom: 0.75rem;
  }
  .ss-compare-label {
    font-family: 'DM Mono', monospace;
    font-size: 0.72rem;
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 0.12em;
  }
  .ss-compare-table {
    display: grid;
    grid-template-columns: 1.4fr 1fr 1fr;
    border: 1px solid var(--border);
    border-radius: 4px;
    overflow: hidden;
  }
  .ss-col {
    background: var(--surface2);
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--border);
  }
  .ss-col-label { background: var(--bg2); }
  .ss-col-title {
    font-family: 'Bebas Neue', sans-serif;
    font-size: 1.1rem;
    letter-spacing: 0.05em;
    display: flex;
    align-items: center;
    gap: 4px;
  }
  .ss-row-label {
    padding: 0.6rem 1rem;
    border-bottom: 1px solid var(--border);
    font-family: 'DM Mono', monospace;
    font-size: 0.72rem;
    color: var(--text3);
    text-transform: uppercase;
    letter-spacing: 0.07em;
    background: var(--bg2);
    display: flex;
    align-items: center;
  }
  .ss-row-li, .ss-row-ss {
    padding: 0.6rem 1rem;
    border-bottom: 1px solid var(--border);
    font-size: 0.82rem;
    color: var(--text2);
    display: flex;
    align-items: center;
    line-height: 1.4;
  }
  .ss-row-li { background: var(--surface); }
  .ss-row-ss { background: var(--surface); }
  .ss-positive { color: var(--green) !important; }
  .ss-caution  { color: var(--amber) !important; }
  .ss-neutral  { color: var(--text2) !important; }
  /* Son satır border kaldır */
  .ss-compare-table > *:nth-last-child(-n+3) { border-bottom: none; }

  .ss-types-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    margin-top: 1.5rem;
  }
  .ss-type-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-top: 2px solid var(--ss-color, var(--accent));
    border-radius: 4px;
    padding: 1.5rem;
    transition: transform 0.25s, box-shadow 0.25s;
  }
  .ss-type-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 32px rgba(0,0,0,0.3);
  }
  .ss-type-header {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    margin-bottom: 1rem;
  }
  .ss-type-name {
    font-family: 'Bebas Neue', sans-serif;
    font-size: 1.6rem;
    letter-spacing: 0.04em;
    line-height: 1;
    margin-bottom: 0.2rem;
  }
  .ss-type-formula {
    font-family: 'DM Mono', monospace;
    font-size: 0.65rem;
    color: var(--text3);
    letter-spacing: 0.03em;
  }
  .ss-type-desc {
    font-size: 0.82rem;
    color: var(--text2);
    line-height: 1.65;
    margin-bottom: 1rem;
  }
  .ss-type-bars { margin-bottom: 1rem; }
  .ss-type-brands { display: flex; flex-wrap: wrap; gap: 0.35rem; }

  .ss-bottom-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    margin-top: 2.5rem;
  }
  .ss-challenges, .ss-roadmap {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 1.5rem;
  }
  .ss-challenge-list { display: flex; flex-direction: column; gap: 1.1rem; }
  .ss-challenge-item {
    display: flex;
    gap: 0.85rem;
    align-items: flex-start;
  }
  .ss-challenge-icon {
    flex-shrink: 0;
    width: 32px; height: 32px;
    border-radius: 50%;
    border: 1px solid;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-top: 2px;
  }
  .ss-challenge-title {
    font-size: 0.88rem;
    font-weight: 500;
    color: var(--text);
    margin-bottom: 0.25rem;
  }
  .ss-challenge-desc {
    font-size: 0.78rem;
    color: var(--text3);
    line-height: 1.6;
  }

  .ss-roadmap-list { display: flex; flex-direction: column; gap: 0; }
  .ss-roadmap-item {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    padding-bottom: 1.25rem;
    position: relative;
  }
  .ss-roadmap-item:last-child { padding-bottom: 0; }
  .ss-roadmap-dot {
    width: 12px; height: 12px;
    border-radius: 50%;
    margin-top: 4px;
    flex-shrink: 0;
    position: relative;
    z-index: 1;
  }
  .ss-roadmap-line {
    display: none;
  }
  .ss-roadmap-item:not(:last-child)::after {
    content: '';
    position: absolute;
    left: 5px;
    top: 16px;
    bottom: 0;
    width: 2px;
    background: var(--border2);
  }
  .ss-roadmap-text {
    font-size: 0.82rem;
    color: var(--text2);
    line-height: 1.55;
    padding-top: 2px;
    flex: 1;
  }

  /* ── Görsel iyileştirmeler ─────────────────── */
  .volt-card {
    transition: border-color 0.25s, box-shadow 0.25s, transform 0.2s;
  }
  .volt-card:hover {
    border-color: var(--border2);
    box-shadow: 0 8px 32px rgba(0,212,255,0.06);
    transform: translateY(-2px);
  }
  .volt-card.v400:hover { box-shadow: 0 8px 32px rgba(255,184,0,0.08); }
  .volt-card.v800:hover { box-shadow: 0 8px 32px rgba(0,212,255,0.10); }

  .cell-type-card {
    transition: border-color 0.25s, box-shadow 0.25s, transform 0.2s;
  }
  .cell-type-card:hover {
    box-shadow: 0 8px 32px rgba(0,0,0,0.3);
    transform: translateY(-3px);
  }

  .hier-card {
    transition: background 0.25s, box-shadow 0.25s;
  }
  .hier-card:hover {
    background: var(--surface2);
    box-shadow: inset 0 0 0 1px var(--border2);
  }

  .step-card {
    transition: background 0.25s, box-shadow 0.25s;
  }
  .step-card:hover {
    background: var(--surface);
    box-shadow: inset 0 2px 0 var(--accent);
  }

  /* SVG taşma önleme */
  svg { max-width: 100%; }
  .tab-content svg,
  .connection-tabs ~ div svg {
    overflow: visible;
  }

  /* Hücre format kartları grid — mobil */
  .cell-format-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    margin-bottom: 2.5rem;
  }

  /* Formula box mobil scroll */
  .formula-box {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }
  .formula-box .f-row {
    min-width: 280px;
  }
  .tab-btn {
    position: relative;
    overflow: hidden;
  }
  .tab-btn::after {
    content: '';
    position: absolute;
    inset: 0;
    background: rgba(0,212,255,0.04);
    opacity: 0;
    transition: opacity 0.2s;
  }
  .tab-btn:hover::after { opacity: 1; }

  /* Hero stats daha belirgin */
  .hero-stat strong {
    background: linear-gradient(135deg, var(--accent), var(--green));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
  }

  /* Divider daha görünür */
  .divider {
    background: linear-gradient(90deg, transparent, var(--accent) 20%, var(--border2) 50%, var(--accent) 80%, transparent);
    opacity: 0.3;
    height: 1px;
  }

  /* Section label rengi canlılaştırıldı */
  .section-label {
    background: linear-gradient(90deg, var(--accent), var(--green));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
  }

  /* Hambuger menü */
  .nav-hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
  }
  .nav-hamburger span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--text2);
    border-radius: 2px;
    transition: all 0.25s;
  }
  .nav-hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .nav-hamburger.open span:nth-child(2) { opacity: 0; }
  .nav-hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

  /* ── Responsive ─────────────────────────── */
  @media (max-width: 900px) {
    .evbm-nav ul { gap: 1.2rem; }
    .evbm-nav ul li a { font-size: 0.72rem; }
  }

  @media (max-width: 768px) {
    /* Nav mobil */
    .evbm-nav { padding: 0 1rem; height: auto; min-height: 52px; flex-wrap: wrap; position: relative; border-radius: 18px 18px 0 0; }
    .nav-hamburger { display: flex; }
    .evbm-nav ul {
      display: none;
      width: 100%;
      flex-direction: column;
      gap: 0;
      padding: 0.5rem 0 0.75rem;
      border-top: 1px solid var(--border);
      margin-top: 0.25rem;
      order: 3;
    }
    .evbm-nav ul.open { display: flex; }
    .evbm-nav ul li a {
      display: block;
      padding: 0.6rem 0;
      font-size: 0.82rem;
    }
    .nav-right { margin-left: auto; }

    .ss-types-grid { grid-template-columns: 1fr; gap: 1rem; }
    .ss-bottom-grid { grid-template-columns: 1fr; gap: 1rem; }
    .ss-compare-table { grid-template-columns: 1fr 1fr 1fr; font-size: 0.75rem; }
    .ss-row-label, .ss-row-li, .ss-row-ss, .ss-col { padding: 0.5rem 0.6rem; }

    /* Hero */
    .hero { padding: 1.5rem 1.25rem 2rem; }
    .hero-visual { display: none; }
    .hero h1 { font-size: clamp(2.8rem, 12vw, 5rem); }

    /* Sections */
    section { padding: 2.5rem 1.25rem; }
    .section-title { font-size: clamp(1.6rem, 6vw, 2.5rem); }

    /* Grids → single column */
    .voltage-grid { grid-template-columns: 1fr; gap: 1rem; }
    .tab-content.active { grid-template-columns: 1fr; gap: 1.5rem; }
    .hierarchy-flow { grid-template-columns: 1fr; gap: 1rem; }
    .cell-types-grid { grid-template-columns: 1fr 1fr; gap: 1rem; }
    .steps-grid { grid-template-columns: 1fr 1fr; gap: 0; }
    .cell-format-grid { grid-template-columns: 1fr; gap: 1rem; }

    /* 800V neden grid */
    .why-800v-grid { grid-template-columns: 1fr !important; }

    /* Hierarchy arrows hidden */
    .hier-card:not(:last-child)::after { display: none; }
    .hier-card { border-bottom: none; }
    .hier-card:not(:last-child) { border-bottom: 1px solid var(--border); }

    /* CTP kutusu */
    .ctp-box { flex-direction: column !important; }

    /* Tab butonları küçük ekran */
    .tab-btn { padding: 0.65rem 1rem; font-size: 0.78rem; }

    /* Footer */
    .evbm-footer { padding: 2rem 1.25rem; }

    /* volt-card padding */
    .volt-card { padding: 1.5rem 1.25rem; }
    .volt-number { font-size: 3rem; }
  }

  @media (max-width: 520px) {
    .cell-types-grid { grid-template-columns: 1fr; }
    .steps-grid { grid-template-columns: 1fr; }
    .hero-stats { gap: 1.25rem; }
    .hero-stat strong { font-size: 1.7rem; }
    .tab-btn { padding: 0.6rem 0.75rem; font-size: 0.72rem; }
    .connection-tabs { overflow-x: auto; -webkit-overflow-scrolling: touch; }
    .section-subtitle { font-size: 0.88rem; }
    /* Kimya kartı span 2 → tam genişlik */
    .cell-type-card[style*="span 2"] { grid-column: span 1 !important; }
    /* SS compare tablosu çok dar → kaydırılabilir wrapper */
    .ss-compare-table { font-size: 0.68rem; }
    .ss-row-label, .ss-row-li, .ss-row-ss, .ss-col { padding: 0.4rem 0.45rem; }
  }

  @media (max-width: 380px) {
    .hero h1 { font-size: 2.4rem; }
    section { padding: 2rem 1rem; }
    .evbm-footer { padding: 1.5rem 1rem; }
  }