/*
 * LTI Holdings, Inc. (Boyd Corporation)
 * Design system built for engineered materials & thermal solutions
 * Following the 13-company redesign brief: thermal visualization + B2B standards
 */

:root {
    /* Brand Colors */
    --primary: #003366; /* Engineering deep blue */
    --primary-light: #0066CC;
    --thermal-red: #DC2626;
    --thermal-orange: #EA580C;
    --cool-blue: #0EA5E9;
    --efficiency-green: #059669;

    /* Neutral palette */
    --gray-900: #0B1726;
    --gray-800: #13233B;
    --gray-700: #1F2F46;
    --gray-600: #27364D;
    --gray-500: #475569;
    --gray-400: #64748B;
    --gray-300: #CBD5E1;
    --gray-200: #E2E8F0;
    --gray-100: #EDF2F7;
    --surface: #F8F9FA;
    --surface-alt: #EEF2F6;
    --white: #FFFFFF;

    /* Typography */
    --text-color: #0F172A;
    --text-muted: #4B5563;
    --font-sans: 'Inter', 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
    --font-heading: 'Barlow', 'Inter', 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;

    /* Spacing */
    --space-2xs: 0.5rem;
    --space-xs: 0.75rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2.25rem;
    --space-xl: 3rem;
    --space-2xl: 4rem;

    /* Radii & Shadows */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --shadow-sm: 0 2px 6px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 10px 30px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 18px 38px rgba(0, 0, 0, 0.12);

    /* Layout */
    --container: 1200px;
    --container-wide: 1320px;
    --transition-fast: 150ms ease;
    --transition: 220ms ease;
    --nav-height: 96px;
}

/* Resets */
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
    font-family: var(--font-sans);
    background: var(--surface);
    color: var(--text-color);
    line-height: 1.6;
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
}
a { color: var(--primary-light); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--primary); }
img { max-width: 100%; height: auto; display: block; }

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    color: var(--gray-900);
    line-height: 1.2;
    margin-bottom: var(--space-sm);
}

h1 { font-size: clamp(2.4rem, 1.6rem + 1vw, 3.4rem); }
h2 { font-size: clamp(1.8rem, 1.4rem + 0.6vw, 2.4rem); }
h3 { font-size: clamp(1.4rem, 1.2rem + 0.4vw, 1.8rem); }
h4 { font-size: 1.2rem; }
p { margin-bottom: var(--space-sm); color: var(--text-muted); }

ul { margin-left: var(--space-sm); margin-bottom: var(--space-sm); color: var(--text-muted); }
li { margin-bottom: var(--space-2xs); }

.container { width: min(100%, var(--container)); margin: 0 auto; padding: 0 var(--space-sm); }
.container-wide { width: min(100%, var(--container-wide)); margin: 0 auto; padding: 0 var(--space-sm); }

.section { padding: var(--space-xl) 0; }
.section-tight { padding: var(--space-lg) 0; }
.section-alt { background: var(--surface-alt); }

.text-center { text-align: center; }
.text-right { text-align: right; }

.eyebrow {
    display: inline-block;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-weight: 700;
    color: var(--primary-light);
    font-size: 0.85rem;
    margin-bottom: var(--space-2xs);
}

.subhead { color: var(--gray-500); font-size: 1.05rem; }

/* Navigation */
.site-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: linear-gradient(135deg, #0b1726 0%, #0f233b 100%);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255,255,255,0.08);
    box-shadow: var(--shadow-md);
}

.navbar {
    position: relative;
    display: grid;
    grid-template-columns: auto 1fr auto;
    grid-template-rows: auto auto;
    grid-template-areas:
        "brand . actions"
        "menu menu menu";
    align-items: center;
    column-gap: var(--space-md);
    row-gap: var(--space-2xs);
    min-height: var(--nav-height);
    padding: var(--space-xs) 0;
}

.nav-brand { grid-area: brand; display: flex; flex-direction: column; gap: 4px; align-self: start; }
.logo { display: inline-flex; flex-wrap: wrap; align-items: center; gap: 6px; font-weight: 800; letter-spacing: 0.04em; color: var(--white); font-size: 1.05rem; text-transform: uppercase; line-height: 1.2; }
.logo span { color: var(--cool-blue); }
.nav-tagline { color: var(--gray-300); font-size: 0.9rem; letter-spacing: 0.02em; }

.nav-primary { grid-area: menu; align-self: end; width: 100%; }
.nav-menu {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--space-xs);
    column-gap: var(--space-md);
    padding: 0;
    margin: 0;
}
.nav-menu > li { position: relative; min-width: max-content; }
.nav-menu > li > a {
    color: var(--white);
    font-weight: 700;
    padding: 0.65rem 0.9rem;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    border-radius: var(--radius-md);
    border: 1px solid rgba(255,255,255,0.05);
    background: rgba(255,255,255,0.02);
    line-height: 1.35;
    white-space: normal;
}
.nav-menu > li > a:hover, .nav-menu > li:focus-within > a {
    color: var(--cool-blue);
    border-color: rgba(14,165,233,0.35);
    background: rgba(14,165,233,0.12);
}

.nav-menu .dropdown {
    display: none;
    position: absolute;
    top: calc(100% + 8px);
    left: 0;
    width: max-content;
    max-width: 420px;
    background: var(--gray-900);
    border: 1px solid var(--gray-700);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    padding: var(--space-xs) var(--space-sm);
    gap: var(--space-2xs);
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}
.nav-menu .dropdown li { padding: 0; margin: 0; }
.nav-menu .dropdown a {
    width: 100%;
    color: var(--white);
    padding: 0.5rem 0.4rem;
    display: block;
    border-radius: var(--radius-sm);
    line-height: 1.4;
    white-space: normal;
}
.nav-menu .dropdown a:hover { background: rgba(255,255,255,0.05); }
.nav-menu > li:hover > .dropdown, .nav-menu > li:focus-within > .dropdown { display: grid; }

.nav-actions { grid-area: actions; display: inline-flex; align-items: center; gap: var(--space-2xs); justify-self: end; }

.nav-toggle { grid-area: actions; display: none; background: none; border: 1px solid var(--gray-700); color: var(--white); padding: var(--space-2xs) var(--space-xs); border-radius: var(--radius-sm); }

@media (max-width: 960px) {
    .navbar { grid-template-columns: 1fr auto; grid-template-areas: "brand actions" "menu menu"; row-gap: var(--space-xs); }
    .nav-tagline { display: none; }
    .nav-actions { display: none; }
    .nav-toggle { display: inline-flex; align-items: center; gap: 8px; cursor: pointer; justify-self: end; }
    .nav-primary { width: 100%; }
    .nav-menu {
        position: absolute;
        left: 0;
        right: 0;
        top: calc(100% + var(--space-2xs));
        width: 100%;
        flex-direction: column;
        align-items: stretch;
        background: var(--gray-900);
        padding: var(--space-sm);
        gap: var(--space-xs);
        border: 1px solid var(--gray-700);
        border-radius: var(--radius-md);
        box-shadow: var(--shadow-md);
        display: none;
    }
    .nav-menu.open { display: flex; }
    .nav-menu > li { width: 100%; }
    .nav-menu > li > a { width: 100%; background: rgba(255,255,255,0.04); border-color: rgba(255,255,255,0.08); }
    .nav-menu .dropdown { position: static; width: 100%; max-width: none; box-shadow: none; border: 1px solid var(--gray-700); margin-top: var(--space-2xs); padding: var(--space-2xs) var(--space-xs); }
    .nav-menu .dropdown a { padding: 0.5rem; }
    .nav-menu > li:hover > .dropdown, .nav-menu > li:focus-within > .dropdown { display: block; }
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 0.75rem 1.25rem;
    border-radius: var(--radius-md);
    font-weight: 700;
    letter-spacing: 0.01em;
    border: 1px solid transparent;
    cursor: pointer;
    transition: transform var(--transition-fast), box-shadow var(--transition), background var(--transition), color var(--transition);
}

.btn-primary { background: var(--primary-light); color: var(--white); box-shadow: var(--shadow-sm); }
.btn-primary:hover { background: var(--primary); transform: translateY(-1px); box-shadow: var(--shadow-md); }

.btn-secondary { background: transparent; color: var(--white); border-color: rgba(255,255,255,0.4); }
.btn-secondary:hover { border-color: var(--cool-blue); color: var(--cool-blue); }

.btn-outline { background: transparent; color: var(--primary); border-color: var(--primary); }
.btn-outline:hover { background: rgba(0,51,102,0.08); }

.btn-ghost { background: transparent; color: var(--primary-light); }
.btn-ghost:hover { color: var(--primary); }

.badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 0.35rem 0.65rem;
    border-radius: var(--radius-sm);
    background: var(--surface-alt);
    color: var(--gray-600);
    font-weight: 600;
    font-size: 0.9rem;
}

.chip {
    display: inline-flex;
    align-items: center;
    padding: 0.55rem 0.9rem;
    border-radius: 999px;
    border: 1px solid var(--gray-200);
    color: var(--gray-600);
    background: var(--white);
    gap: 8px;
    font-weight: 600;
}

.chip.heat { border-color: rgba(234, 88, 12, 0.3); color: var(--thermal-orange); background: #FFF5EC; }
.chip.cool { border-color: rgba(14, 165, 233, 0.3); color: var(--cool-blue); background: #ECF7FF; }
.chip.seal { border-color: rgba(0, 102, 204, 0.3); color: var(--primary-light); background: #EAF1FF; }

.link-arrow { font-weight: 700; color: var(--primary-light); display: inline-flex; align-items: center; gap: 6px; }
.link-arrow:hover { color: var(--primary); }

/* Hero */
.hero {
    position: relative;
    margin-top: var(--nav-height);
    background-size: cover;
    background-position: center;
    color: var(--white);
    border-bottom: 1px solid rgba(255,255,255,0.06);
    overflow: hidden;
}

.hero::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(120deg, rgba(0, 51, 102, 0.82) 0%, rgba(0, 102, 204, 0.78) 55%, rgba(14, 165, 233, 0.65) 100%);
    pointer-events: none;
}

.hero .container { position: relative; z-index: 1; }
.hero-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: var(--space-lg); align-items: center; padding: var(--space-2xl) 0 var(--space-xl); }
.hero h1 { color: var(--white); }
.hero p { color: #E2E8F0; font-size: 1.05rem; }
.hero .actions { display: flex; flex-wrap: wrap; gap: var(--space-sm); margin-top: var(--space-sm); }
.hero .card { background: rgba(255, 255, 255, 0.06); color: var(--white); border: 1px solid rgba(255,255,255,0.1); }
.hero-stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: var(--space-sm); }
.hero-stat { padding: var(--space-sm); background: rgba(255,255,255,0.06); border-radius: var(--radius-md); border: 1px solid rgba(255,255,255,0.1); }
.hero-stat strong { display: block; font-size: 1.6rem; color: var(--white); }
.hero-stat span { color: #E5E7EB; font-size: 0.95rem; }

/* Cards & grids */
.card {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    padding: var(--space-md);
    height: 100%;
    transition: transform var(--transition), box-shadow var(--transition);
}

.card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }

.featured-card { border-top: 4px solid var(--primary-light); }

.grid-2 { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: var(--space-md); }
.grid-3 { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: var(--space-md); }
.grid-4 { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: var(--space-sm); }

.stat-card { background: var(--white); border: 1px solid var(--gray-200); border-radius: var(--radius-md); padding: var(--space-md); text-align: left; box-shadow: var(--shadow-sm); }
.stat-card strong { display: block; font-size: 2rem; color: var(--primary); }
.stat-card span { color: var(--text-muted); }

.icon-circle { width: 44px; height: 44px; border-radius: 50%; display: inline-flex; align-items: center; justify-content: center; background: #EAF1FF; color: var(--primary); font-weight: 800; }

.stack { display: flex; flex-direction: column; gap: var(--space-sm); }
.inline { display: inline-flex; align-items: center; gap: 8px; }

.image-frame { border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow-md); border: 1px solid var(--gray-200); }

.list-check { list-style: none; margin: 0; padding: 0; }
.list-check li { position: relative; padding-left: 1.6rem; margin-bottom: var(--space-xs); color: var(--text-muted); }
.list-check li::before { content: '•'; position: absolute; left: 0; color: var(--efficiency-green); font-size: 1.4rem; line-height: 1; }

.tag-grid { display: flex; flex-wrap: wrap; gap: var(--space-2xs); }

.divider { height: 1px; background: var(--gray-200); margin: var(--space-md) 0; }

/* Solution matrix */
.solution-matrix { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: var(--space-md); }
.solution-card { border-left: 4px solid var(--primary-light); }
.solution-card .label { display: inline-flex; align-items: center; gap: 8px; font-weight: 700; color: var(--primary); margin-bottom: var(--space-xs); }
.solution-card ul { margin-left: 1rem; color: var(--text-muted); }

/* Industry tabs */
.tabs { background: var(--white); border: 1px solid var(--gray-200); border-radius: var(--radius-lg); box-shadow: var(--shadow-sm); }
.tab-list { display: flex; flex-wrap: wrap; gap: var(--space-2xs); padding: var(--space-sm); border-bottom: 1px solid var(--gray-200); }
.tab-button { padding: 0.65rem 1rem; border-radius: var(--radius-sm); border: 1px solid var(--gray-200); background: var(--surface); font-weight: 700; color: var(--gray-600); cursor: pointer; transition: background var(--transition), color var(--transition), border var(--transition); }
.tab-button.active { background: #EAF1FF; color: var(--primary); border-color: rgba(0, 102, 204, 0.4); }
.tab-panel { display: none; padding: var(--space-md); }
.tab-panel.active { display: block; }

/* Map & network */
.map-grid { display: grid; grid-template-columns: 2fr 1fr; gap: var(--space-md); align-items: stretch; }
.map-card { position: relative; overflow: hidden; border-radius: var(--radius-lg); border: 1px solid var(--gray-200); box-shadow: var(--shadow-md); background: var(--white); }
.map-visual { position: relative; padding: var(--space-md); background: linear-gradient(180deg, #0B1726 0%, #0F2B4A 100%); }
.map-visual img { opacity: 0.75; filter: brightness(1.05); mix-blend-mode: screen; }
.map-pin { position: absolute; width: 14px; height: 14px; border-radius: 50%; background: var(--thermal-orange); box-shadow: 0 0 0 8px rgba(234,88,12,0.12); cursor: pointer; border: 2px solid #fff; }
.map-pin.active { background: var(--cool-blue); box-shadow: 0 0 0 10px rgba(14,165,233,0.18); }
.map-pin[data-region="americas"] { top: 48%; left: 28%; }
.map-pin[data-region="emea"] { top: 40%; left: 52%; }
.map-pin[data-region="apac"] { top: 52%; left: 72%; }
.map-pin[data-region="india"] { top: 52%; left: 62%; }

.map-legend { padding: var(--space-md); }
.map-legend .legend-item { display: flex; justify-content: space-between; align-items: center; padding: var(--space-xs); border-bottom: 1px solid var(--gray-200); }
.map-legend .legend-item strong { color: var(--primary); font-size: 1.2rem; }
.map-legend .legend-item.active { background: #EAF1FF; border-radius: var(--radius-sm); }

@media (max-width: 900px) { .map-grid { grid-template-columns: 1fr; } }

/* Whitepaper CTA */
.whitepaper { background: linear-gradient(90deg, #0B1726 0%, #0F2B4A 100%); color: var(--white); border-radius: var(--radius-lg); padding: var(--space-lg); box-shadow: var(--shadow-lg); position: relative; overflow: hidden; }
.whitepaper::after { content: ''; position: absolute; right: -120px; top: -120px; width: 260px; height: 260px; background: radial-gradient(circle, rgba(14,165,233,0.35) 0%, rgba(14,165,233,0) 70%); }
.whitepaper h2, .whitepaper p { color: var(--white); }
.whitepaper .actions { display: flex; flex-wrap: wrap; gap: var(--space-sm); margin-top: var(--space-sm); }

/* Tables & legal */
table { width: 100%; border-collapse: collapse; margin: var(--space-md) 0; background: var(--white); }
th, td { border: 1px solid var(--gray-200); padding: var(--space-xs); text-align: left; color: var(--text-muted); }
th { background: var(--surface-alt); color: var(--gray-700); }

/* Forms */
form { display: grid; gap: var(--space-sm); }
input, select, textarea {
    width: 100%;
    padding: 0.85rem 0.9rem;
    border-radius: var(--radius-md);
    border: 1px solid var(--gray-300);
    font-family: var(--font-sans);
    transition: border var(--transition), box-shadow var(--transition);
    background: var(--white);
}
input:focus, select:focus, textarea:focus { border-color: var(--primary-light); outline: none; box-shadow: 0 0 0 3px rgba(0,102,204,0.15); }
label { font-weight: 700; color: var(--gray-700); }

/* Footer */
.site-footer { background: #0B1726; color: #E5E7EB; padding: var(--space-xl) 0 var(--space-lg); margin-top: var(--space-xl); }
.footer-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: var(--space-md); }
.site-footer h4 { color: var(--white); }
.site-footer a { color: #E0E7FF; }
.site-footer a:hover { color: var(--cool-blue); }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.08); margin-top: var(--space-md); padding-top: var(--space-sm); display: flex; flex-wrap: wrap; justify-content: space-between; gap: var(--space-sm); }

/* Utility */
.shadow { box-shadow: var(--shadow-md); }
.muted { color: var(--text-muted); }
.highlight { color: var(--thermal-orange); }
.visually-hidden { position: absolute; left: -9999px; top: auto; width: 1px; height: 1px; overflow: hidden; }
.visually-hidden:focus { position: static; width: auto; height: auto; left: auto; background: #fff; padding: var(--space-2xs); z-index: 1001; }

@media (max-width: 640px) {
    .section { padding: var(--space-lg) 0; }
    .hero-grid { padding: var(--space-lg) 0; }
    .hero .actions { flex-direction: column; align-items: flex-start; }
}