/* ==========================================================================
   Bilgi Merkezi - Knowledge Center Shared Styles
   Dark theme: bg #0f172a, text #f8fafc, accent #6366f1
   All classes prefixed with km-
   ========================================================================== */

:root {
    --km-primary: #6366f1;
    --km-primary-light: rgba(99, 102, 241, 0.1);
    --km-primary-dark: #4f46e5;
    --km-secondary: #0ea5e9;
    --km-secondary-light: rgba(14, 165, 233, 0.1);
    --km-success: #10b981;
    --km-success-light: rgba(16, 185, 129, 0.1);
    --km-warning: #f59e0b;
    --km-warning-light: rgba(245, 158, 11, 0.1);
    --km-danger: #ef4444;
    --km-danger-light: rgba(239, 68, 68, 0.1);
    --km-orange: #f97316;
    --km-orange-light: rgba(249, 115, 22, 0.1);
    --km-bg-dark: #0f172a;
    --km-bg-darker: #060818;
    --km-bg-card: #1e293b;
    --km-bg-card-hover: #334155;
    --km-text: #f8fafc;
    --km-text-muted: #94a3b8;
    --km-text-dim: #64748b;
    --km-border: rgba(255, 255, 255, 0.1);
    --km-border-strong: rgba(255, 255, 255, 0.2);
    --km-radius: 12px;
    --km-radius-lg: 16px;
    --km-radius-sm: 8px;
    --km-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
    --km-shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.3);
    --km-glow: 0 0 20px rgba(99, 102, 241, 0.3);
    --km-transition: 0.3s ease;
}

/* ---- Hero ---- */
.km-hero {
    padding: 120px 0 60px;
    background: linear-gradient(135deg, var(--km-bg-dark) 0%, var(--km-bg-darker) 100%);
    position: relative;
    overflow: hidden;
}

.km-hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse at 30% 20%, rgba(99,102,241,0.12) 0%, transparent 60%),
                radial-gradient(ellipse at 70% 80%, rgba(14,165,233,0.08) 0%, transparent 60%);
    pointer-events: none;
}

.km-hero__inner {
    position: relative;
    z-index: 2;
    max-width: 820px;
}

.km-hero__badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 16px;
    background: var(--km-primary-light);
    border: 1px solid rgba(99,102,241,0.3);
    border-radius: 50px;
    color: var(--km-primary);
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 1.25rem;
}

.km-hero__badge .material-icons {
    font-size: 16px;
}

.km-hero h1 {
    font-size: 2.75rem;
    font-weight: 800;
    line-height: 1.15;
    color: var(--km-text);
    margin-bottom: 1.25rem;
}

.km-hero h1 .km-accent {
    color: var(--km-primary);
}

.km-hero__desc {
    font-size: 1.15rem;
    color: var(--km-text-muted);
    line-height: 1.7;
    margin-bottom: 1.5rem;
}

.km-hero__meta {
    display: flex;
    flex-wrap: wrap;
    gap: 1.25rem;
    color: var(--km-text-dim);
    font-size: 0.9rem;
}

.km-hero__meta span {
    display: inline-flex;
    align-items: center;
    gap: 5px;
}

.km-hero__meta .material-icons {
    font-size: 18px;
    color: var(--km-primary);
}

/* ---- Main Content Area ---- */
.km-content-area {
    background: var(--km-bg-dark);
    padding: 60px 0 80px;
}

.km-layout {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 40px;
    align-items: start;
}

/* ---- Table of Contents (Sidebar) ---- */
.km-toc {
    position: sticky;
    top: 100px;
    background: var(--km-bg-card);
    border: 1px solid var(--km-border);
    border-radius: var(--km-radius);
    padding: 24px;
}

.km-toc__title {
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--km-text);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.km-toc__title .material-icons {
    font-size: 18px;
    color: var(--km-primary);
}

.km-toc__list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.km-toc__list li {
    margin-bottom: 4px;
}

.km-toc__list a {
    display: block;
    padding: 6px 12px;
    color: var(--km-text-muted);
    font-size: 0.85rem;
    border-radius: var(--km-radius-sm);
    text-decoration: none;
    transition: var(--km-transition);
    border-left: 2px solid transparent;
}

.km-toc__list a:hover,
.km-toc__list a.active {
    color: var(--km-primary);
    background: var(--km-primary-light);
    border-left-color: var(--km-primary);
}

/* ---- Article Body ---- */
.km-article {
    min-width: 0;
}

.km-article h2 {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--km-text);
    margin-top: 3rem;
    margin-bottom: 1rem;
    padding-bottom: 0.75rem;
    border-bottom: 2px solid var(--km-border);
    scroll-margin-top: 80px;
}

.km-article h2:first-child {
    margin-top: 0;
}

.km-article h3 {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--km-text);
    margin-top: 2rem;
    margin-bottom: 0.75rem;
    scroll-margin-top: 80px;
}

.km-article h4 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--km-text-muted);
    margin-top: 1.5rem;
    margin-bottom: 0.5rem;
}

.km-article p {
    color: var(--km-text-muted);
    line-height: 1.8;
    margin-bottom: 1rem;
    font-size: 1rem;
}

.km-article strong {
    color: var(--km-text);
    font-weight: 600;
}

.km-article ul,
.km-article ol {
    color: var(--km-text-muted);
    padding-left: 1.5rem;
    margin-bottom: 1.25rem;
    line-height: 1.8;
}

.km-article li {
    margin-bottom: 0.5rem;
}

/* ---- Info / Tip / Warning Boxes ---- */
.km-box {
    padding: 20px 24px;
    border-radius: var(--km-radius);
    margin: 1.5rem 0;
    border-left: 4px solid;
}

.km-box--info {
    background: var(--km-secondary-light);
    border-color: var(--km-secondary);
}

.km-box--tip {
    background: var(--km-success-light);
    border-color: var(--km-success);
}

.km-box--warning {
    background: var(--km-warning-light);
    border-color: var(--km-warning);
}

.km-box--danger {
    background: var(--km-danger-light);
    border-color: var(--km-danger);
}

.km-box__title {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 700;
    margin-bottom: 8px;
    font-size: 0.95rem;
}

.km-box--info .km-box__title { color: var(--km-secondary); }
.km-box--tip .km-box__title { color: var(--km-success); }
.km-box--warning .km-box__title { color: var(--km-warning); }
.km-box--danger .km-box__title { color: var(--km-danger); }

.km-box p {
    margin-bottom: 0;
    font-size: 0.95rem;
}

/* ---- Cards ---- */
.km-card {
    background: var(--km-bg-card);
    border: 1px solid var(--km-border);
    border-radius: var(--km-radius);
    padding: 24px;
    margin-bottom: 1.25rem;
    transition: var(--km-transition);
}

.km-card:hover {
    border-color: var(--km-border-strong);
    box-shadow: var(--km-shadow);
}

.km-card__icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 14px;
    font-size: 24px;
}

.km-card__icon--primary { background: var(--km-primary-light); color: var(--km-primary); }
.km-card__icon--secondary { background: var(--km-secondary-light); color: var(--km-secondary); }
.km-card__icon--success { background: var(--km-success-light); color: var(--km-success); }
.km-card__icon--warning { background: var(--km-warning-light); color: var(--km-warning); }
.km-card__icon--danger { background: var(--km-danger-light); color: var(--km-danger); }
.km-card__icon--orange { background: var(--km-orange-light); color: var(--km-orange); }

.km-card__title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--km-text);
    margin-bottom: 8px;
}

.km-card__text {
    color: var(--km-text-muted);
    font-size: 0.95rem;
    line-height: 1.7;
}

/* Grid for cards */
.km-grid {
    display: grid;
    gap: 20px;
    margin: 1.5rem 0;
}

.km-grid--2 { grid-template-columns: repeat(2, 1fr); }
.km-grid--3 { grid-template-columns: repeat(3, 1fr); }
.km-grid--4 { grid-template-columns: repeat(4, 1fr); }

/* ---- Step Cards ---- */
.km-step {
    background: var(--km-bg-card);
    border: 1px solid var(--km-border);
    border-radius: var(--km-radius);
    padding: 24px;
    margin-bottom: 1.25rem;
    display: flex;
    gap: 20px;
    align-items: flex-start;
}

.km-step__number {
    flex-shrink: 0;
    width: 44px;
    height: 44px;
    border-radius: 12px;
    background: var(--km-primary);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 1.1rem;
}

.km-step__content h3 {
    margin-top: 0;
    margin-bottom: 0.5rem;
}

.km-step__content p {
    margin-bottom: 0.5rem;
}

/* ---- Checklist ---- */
.km-checklist {
    list-style: none;
    padding: 0;
    margin: 1.25rem 0;
}

.km-checklist li {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 10px 16px;
    background: var(--km-bg-card);
    border: 1px solid var(--km-border);
    border-radius: var(--km-radius-sm);
    margin-bottom: 8px;
    color: var(--km-text-muted);
    font-size: 0.95rem;
    line-height: 1.6;
}

.km-checklist li .material-icons {
    color: var(--km-success);
    font-size: 20px;
    flex-shrink: 0;
    margin-top: 2px;
}

/* ---- Comparison Table ---- */
.km-table-wrap {
    overflow-x: auto;
    margin: 1.5rem 0;
    border-radius: var(--km-radius);
    border: 1px solid var(--km-border);
}

.km-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.95rem;
}

.km-table th,
.km-table td {
    padding: 14px 18px;
    text-align: left;
    border-bottom: 1px solid var(--km-border);
}

.km-table thead th {
    background: var(--km-bg-card);
    color: var(--km-text);
    font-weight: 700;
    white-space: nowrap;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.3px;
}

.km-table tbody td {
    color: var(--km-text-muted);
    background: var(--km-bg-dark);
}

.km-table tbody tr:hover td {
    background: var(--km-bg-card);
}

.km-table tbody tr:last-child td {
    border-bottom: none;
}

.km-table .km-check {
    color: var(--km-success);
    font-size: 20px;
}

.km-table .km-cross {
    color: var(--km-danger);
    font-size: 20px;
}

.km-table .km-partial {
    color: var(--km-warning);
    font-size: 20px;
}

/* ---- FAQ ---- */
.km-faq {
    margin: 2rem 0;
}

.km-faq__item {
    background: var(--km-bg-card);
    border: 1px solid var(--km-border);
    border-radius: var(--km-radius);
    margin-bottom: 12px;
    overflow: hidden;
}

.km-faq__question {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 18px 24px;
    cursor: pointer;
    color: var(--km-text);
    font-weight: 600;
    font-size: 1rem;
    transition: var(--km-transition);
    user-select: none;
}

.km-faq__question:hover {
    background: rgba(99,102,241,0.05);
}

.km-faq__question .material-icons {
    color: var(--km-primary);
    transition: transform 0.3s ease;
    font-size: 22px;
}

.km-faq__item.active .km-faq__question .material-icons {
    transform: rotate(180deg);
}

.km-faq__answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease;
}

.km-faq__item.active .km-faq__answer {
    max-height: 600px;
}

.km-faq__answer-inner {
    padding: 0 24px 20px;
    color: var(--km-text-muted);
    line-height: 1.8;
    font-size: 0.95rem;
}

/* ---- CTA Section ---- */
.km-cta {
    background: linear-gradient(135deg, var(--km-primary-dark) 0%, var(--km-primary) 100%);
    border-radius: var(--km-radius-lg);
    padding: 48px;
    text-align: center;
    margin: 3rem 0;
    position: relative;
    overflow: hidden;
}

.km-cta::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 80% 20%, rgba(255,255,255,0.1) 0%, transparent 60%);
    pointer-events: none;
}

.km-cta h3 {
    color: #fff;
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 12px;
    position: relative;
}

.km-cta p {
    color: rgba(255,255,255,0.85);
    font-size: 1.05rem;
    margin-bottom: 24px;
    position: relative;
}

.km-cta__btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    background: #fff;
    color: var(--km-primary-dark);
    border-radius: 50px;
    font-weight: 700;
    font-size: 1rem;
    text-decoration: none;
    transition: var(--km-transition);
    position: relative;
}

.km-cta__btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.3);
    color: var(--km-primary-dark);
}

/* ---- Related Articles ---- */
.km-related {
    margin: 3rem 0 0;
}

.km-related__title {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--km-text);
    margin-bottom: 1.25rem;
}

.km-related__card {
    display: block;
    background: var(--km-bg-card);
    border: 1px solid var(--km-border);
    border-radius: var(--km-radius);
    padding: 20px;
    text-decoration: none;
    transition: var(--km-transition);
}

.km-related__card:hover {
    border-color: var(--km-primary);
    transform: translateY(-2px);
    box-shadow: var(--km-glow);
}

.km-related__card-title {
    color: var(--km-text);
    font-weight: 600;
    font-size: 1rem;
    margin-bottom: 6px;
}

.km-related__card-desc {
    color: var(--km-text-dim);
    font-size: 0.85rem;
    line-height: 1.5;
}

/* ---- Stat Row ---- */
.km-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin: 1.5rem 0;
}

.km-stat {
    background: var(--km-bg-card);
    border: 1px solid var(--km-border);
    border-radius: var(--km-radius);
    padding: 20px;
    text-align: center;
}

.km-stat__value {
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--km-primary);
    display: block;
}

.km-stat__label {
    font-size: 0.85rem;
    color: var(--km-text-dim);
    margin-top: 4px;
}

/* ---- Responsive ---- */
@media (max-width: 1024px) {
    .km-layout {
        grid-template-columns: 1fr;
    }
    .km-toc {
        position: static;
        margin-bottom: 2rem;
    }
}

@media (max-width: 768px) {
    .km-hero h1 {
        font-size: 1.85rem;
    }
    .km-hero {
        padding: 90px 0 40px;
    }
    .km-article h2 {
        font-size: 1.4rem;
    }
    .km-grid--2,
    .km-grid--3,
    .km-grid--4 {
        grid-template-columns: 1fr;
    }
    .km-stats {
        grid-template-columns: repeat(2, 1fr);
    }
    .km-step {
        flex-direction: column;
        gap: 12px;
    }
    .km-cta {
        padding: 32px 20px;
    }
    .km-table {
        font-size: 0.85rem;
    }
    .km-table th,
    .km-table td {
        padding: 10px 12px;
    }
}

@media (max-width: 480px) {
    .km-stats {
        grid-template-columns: 1fr;
    }
    .km-hero__meta,
    .km-hero-meta {
        flex-direction: column;
        gap: 0.5rem;
    }
}

/* ---- Article 1 compatibility aliases (km-hero-inner style) ---- */
.km-hero-inner { position: relative; z-index: 2; max-width: 820px; }
.km-hero-badge { display: inline-flex; align-items: center; gap: 6px; padding: 6px 16px; background: var(--km-primary-light); border: 1px solid rgba(99,102,241,0.3); border-radius: 50px; color: var(--km-primary); font-size: 0.85rem; font-weight: 600; margin-bottom: 1.25rem; }
.km-hero-badge .material-icons { font-size: 16px; }
.km-hero-title { font-size: 2.75rem; font-weight: 800; line-height: 1.15; color: var(--km-text); margin-bottom: 1.25rem; }
.km-hero-subtitle { font-size: 1.15rem; color: var(--km-text-muted); line-height: 1.7; margin-bottom: 1.5rem; }
.km-hero-meta { display: flex; flex-wrap: wrap; gap: 1.25rem; color: var(--km-text-dim); font-size: 0.9rem; }
.km-meta-item { display: inline-flex; align-items: center; gap: 5px; }
.km-meta-item .material-icons { font-size: 18px; color: var(--km-primary); }

/* ---- TOC alternative classes ---- */
.km-toc-inner { /* wrapper for centered toc layout */ }
.km-toc-header { display: flex; align-items: center; gap: 8px; margin-bottom: 16px; }
.km-toc-header .material-icons { font-size: 18px; color: var(--km-primary); }
.km-toc-title { font-size: 0.9rem; font-weight: 700; color: var(--km-text); text-transform: uppercase; letter-spacing: 0.5px; margin: 0; }
.km-toc-list { list-style: none; padding: 0; margin: 0; }
.km-toc-list li { margin-bottom: 4px; }
.km-toc-list a { display: block; padding: 6px 12px; color: var(--km-text-muted); font-size: 0.85rem; border-radius: var(--km-radius-sm); text-decoration: none; transition: var(--km-transition); border-left: 2px solid transparent; }
.km-toc-list a:hover { color: var(--km-primary); background: var(--km-primary-light); border-left-color: var(--km-primary); }

/* ---- Content Grid / Sidebar ---- */
.km-content-wrapper { background: var(--km-bg-dark); padding: 60px 0 80px; }
.km-content-grid { display: grid; grid-template-columns: 1fr 280px; gap: 40px; align-items: start; }
.km-main-content { min-width: 0; }
.km-sidebar { position: sticky; top: 100px; }
.km-sidebar-card { background: var(--km-bg-card); border: 1px solid var(--km-border); border-radius: var(--km-radius); padding: 24px; margin-bottom: 20px; }
.km-sidebar-title { font-size: 0.9rem; font-weight: 700; color: var(--km-text); text-transform: uppercase; letter-spacing: 0.5px; margin-bottom: 16px; display: flex; align-items: center; gap: 8px; }
.km-sidebar-title .material-icons { font-size: 18px; color: var(--km-primary); }
.km-sidebar-nav { list-style: none; padding: 0; margin: 0; }
.km-sidebar-nav li { margin-bottom: 4px; }
.km-sidebar-nav a { display: block; padding: 6px 12px; color: var(--km-text-muted); font-size: 0.85rem; border-radius: var(--km-radius-sm); text-decoration: none; transition: var(--km-transition); border-left: 2px solid transparent; }
.km-sidebar-nav a:hover, .km-sidebar-nav a.km-nav-active { color: var(--km-primary); background: var(--km-primary-light); border-left-color: var(--km-primary); }

/* ---- Section styling ---- */
.km-section { margin-bottom: 2rem; }
.km-section-title { font-size: 1.75rem; font-weight: 700; color: var(--km-text); margin-top: 2rem; margin-bottom: 1rem; padding-bottom: 0.75rem; border-bottom: 2px solid var(--km-border); scroll-margin-top: 80px; display: flex; align-items: center; gap: 12px; }
.km-section-icon { width: 40px; height: 40px; border-radius: 10px; background: var(--km-primary-light); display: flex; align-items: center; justify-content: center; flex-shrink: 0; }
.km-section-icon .material-icons { color: var(--km-primary); font-size: 22px; }
.km-lead-paragraph { font-size: 1.1rem; color: var(--km-text-muted); line-height: 1.8; margin-bottom: 1.25rem; }

/* ---- FAQ alternative classes ---- */
.km-faq-item { background: var(--km-bg-card); border: 1px solid var(--km-border); border-radius: var(--km-radius); margin-bottom: 12px; overflow: hidden; }
.km-faq-question { display: flex; align-items: center; justify-content: space-between; padding: 18px 24px; cursor: pointer; color: var(--km-text); font-weight: 600; font-size: 1rem; transition: var(--km-transition); user-select: none; background: none; border: none; width: 100%; text-align: left; }
.km-faq-question:hover { background: rgba(99,102,241,0.05); }
.km-faq-question .material-icons { color: var(--km-primary); transition: transform 0.3s ease; font-size: 22px; }
.km-faq-open .km-faq-question .material-icons { transform: rotate(180deg); }
.km-faq-answer { max-height: 0; overflow: hidden; transition: max-height 0.4s ease; }
.km-faq-open .km-faq-answer { max-height: 600px; }
.km-faq-answer-inner { padding: 0 24px 20px; color: var(--km-text-muted); line-height: 1.8; font-size: 0.95rem; }

/* ---- Formula Box ---- */
.km-formula { background: var(--km-bg-card); border: 2px solid var(--km-primary); border-radius: var(--km-radius); padding: 24px 32px; margin: 1.5rem 0; text-align: center; }
.km-formula__label { font-size: 0.85rem; color: var(--km-text-dim); text-transform: uppercase; letter-spacing: 1px; margin-bottom: 12px; }
.km-formula__expr { font-size: 1.5rem; font-weight: 800; color: var(--km-primary); }
.km-formula__desc { font-size: 0.9rem; color: var(--km-text-muted); margin-top: 12px; }

/* ---- Calculator ---- */
.km-calc { background: var(--km-bg-card); border: 1px solid var(--km-border); border-radius: var(--km-radius-lg); padding: 32px; margin: 2rem 0; }
.km-calc__title { font-size: 1.2rem; font-weight: 700; color: var(--km-text); margin-bottom: 20px; display: flex; align-items: center; gap: 10px; }
.km-calc__row { display: flex; gap: 16px; margin-bottom: 16px; flex-wrap: wrap; }
.km-calc__group { flex: 1; min-width: 200px; }
.km-calc__label { display: block; font-size: 0.85rem; color: var(--km-text-muted); margin-bottom: 6px; }
.km-calc__input { width: 100%; padding: 12px 16px; background: var(--km-bg-dark); border: 1px solid var(--km-border); border-radius: var(--km-radius-sm); color: var(--km-text); font-size: 1rem; }
.km-calc__input:focus { outline: none; border-color: var(--km-primary); box-shadow: 0 0 0 3px rgba(99,102,241,0.2); }
.km-calc__btn { padding: 12px 28px; background: var(--km-primary); color: #fff; border: none; border-radius: var(--km-radius-sm); font-weight: 600; cursor: pointer; transition: var(--km-transition); font-size: 1rem; }
.km-calc__btn:hover { background: var(--km-primary-dark); }
.km-calc__result { margin-top: 20px; padding: 20px; background: var(--km-primary-light); border: 1px solid rgba(99,102,241,0.3); border-radius: var(--km-radius); }
.km-calc__result-value { font-size: 2rem; font-weight: 800; color: var(--km-primary); }
.km-calc__result-label { font-size: 0.9rem; color: var(--km-text-muted); }

/* ---- Comparison Cards (vs) ---- */
.km-vs { display: grid; grid-template-columns: 1fr auto 1fr; gap: 20px; align-items: center; margin: 2rem 0; }
.km-vs__card { background: var(--km-bg-card); border: 1px solid var(--km-border); border-radius: var(--km-radius); padding: 24px; }
.km-vs__divider { font-size: 1.5rem; font-weight: 800; color: var(--km-text-dim); }
.km-vs__card-title { font-size: 1.2rem; font-weight: 700; color: var(--km-text); margin-bottom: 12px; }

/* ---- Index / Listing Page ---- */
.km-index-hero { padding: 120px 0 60px; background: linear-gradient(135deg, var(--km-bg-dark) 0%, var(--km-bg-darker) 100%); position: relative; overflow: hidden; }
.km-index-hero::before { content: ''; position: absolute; inset: 0; background: radial-gradient(ellipse at 30% 20%, rgba(99,102,241,0.12) 0%, transparent 60%), radial-gradient(ellipse at 70% 80%, rgba(14,165,233,0.08) 0%, transparent 60%); pointer-events: none; }
.km-index-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin-top: 40px; }
.km-index-card { display: flex; flex-direction: column; background: var(--km-bg-card); border: 1px solid var(--km-border); border-radius: var(--km-radius); overflow: hidden; transition: var(--km-transition); text-decoration: none; }
.km-index-card:hover { border-color: var(--km-primary); transform: translateY(-4px); box-shadow: var(--km-glow); }
.km-index-card__body { padding: 24px; flex: 1; display: flex; flex-direction: column; }
.km-index-card__tag { display: inline-flex; align-items: center; gap: 4px; padding: 4px 10px; background: var(--km-primary-light); border-radius: 50px; color: var(--km-primary); font-size: 0.75rem; font-weight: 600; margin-bottom: 12px; width: fit-content; }
.km-index-card__title { font-size: 1.1rem; font-weight: 700; color: var(--km-text); margin-bottom: 8px; line-height: 1.4; }
.km-index-card__desc { font-size: 0.9rem; color: var(--km-text-muted); line-height: 1.6; flex: 1; }
.km-index-card__meta { display: flex; align-items: center; gap: 12px; margin-top: 16px; padding-top: 16px; border-top: 1px solid var(--km-border); font-size: 0.8rem; color: var(--km-text-dim); }
.km-index-card__meta .material-icons { font-size: 16px; }

@media (max-width: 1024px) {
    .km-content-grid { grid-template-columns: 1fr; }
    .km-sidebar { position: static; }
    .km-index-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
    .km-hero-title { font-size: 1.85rem; }
    .km-section-title { font-size: 1.4rem; }
    .km-content-grid { gap: 20px; }
    .km-vs { grid-template-columns: 1fr; }
    .km-calc__row { flex-direction: column; }
    .km-index-grid { grid-template-columns: 1fr; }
    .km-formula__expr { font-size: 1.2rem; }
}