/* ==================================================
   OPUS ADVISERS — Brand Colors (Section 8.2)
   ================================================== */
:root {
  --color-dark-blue: #002147;
  --color-white: #FFFFFF;
  --color-light-gray: #D7D7D7;
  --color-medium-blue: #003572;
  --color-red: #CC0000;
  --color-yellow: #DAA520;
  --color-green: #15734E;
  --color-cyan: #34B5BA;
  --color-purple: #7030A0;
  --color-dark-gray: #A5A5A3;
  --color-light-blue: #0070C0;

  --font-main: 'Inter', 'Segoe UI', system-ui, sans-serif;
  --max-width: 1140px;
  --header-height: 64px;
  --section-padding: clamp(64px, 8vw, 100px);
  --transition: 0.25s ease;
}

/* ================= RESET & BASE ================= */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-height);
}

body {
  font-family: var(--font-main);
  color: var(--color-dark-blue);
  line-height: 1.65;
  font-size: 16px;
  background: var(--color-white);
  -webkit-font-smoothing: antialiased;
}

img {
  display: block;
  max-width: 100%;
  height: auto;
}

a {
  text-decoration: none;
  color: var(--color-light-blue);
  transition: color var(--transition);
}

a:hover {
  color: var(--color-cyan);
}

ul {
  list-style: none;
}

h1, h2, h3, h4 {
  font-weight: 700;
  line-height: 1.25;
}

strong {
  font-weight: 600;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 clamp(20px, 4vw, 32px);
}

/* ================= UNIFIED BULLETS ================= */
.bullet-list li {
  position: relative;
  padding-left: 16px;
  margin-bottom: 8px;
  font-size: 15px;
  color: var(--color-dark-blue);
}

.bullet-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-medium-blue);
}

.problem-list li {
  position: relative;
  padding-left: 20px;
  margin-bottom: 8px;
  font-size: 15px;
  color: var(--color-dark-blue);
}

.problem-list li::before {
  content: "✕";
  position: absolute;
  left: 0;
  top: 1px;
  color: var(--color-red);
  font-size: 13px;
  font-weight: 700;
  line-height: 1.4;
}

/* ================= HEADER / NAV ================= */
.site-header {
  background: var(--color-dark-blue);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 12px rgba(0, 33, 71, 0.15);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: var(--header-height);
  gap: 16px;
}

.logo-link {
  flex-shrink: 0;
}

.logo {
  height: 36px;
  width: auto;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: clamp(12px, 2vw, 24px);
}

.main-nav a {
  color: var(--color-white);
  font-size: 14px;
  font-weight: 500;
  white-space: nowrap;
  padding: 6px 0;
  border-bottom: 2px solid transparent;
  transition: color var(--transition), border-color var(--transition);
}

.main-nav a:hover,
.main-nav a:focus-visible {
  color: var(--color-cyan);
  border-bottom-color: var(--color-cyan);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.nav-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-white);
  transition: transform var(--transition), opacity var(--transition);
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ================= BUTTONS ================= */
.btn {
  display: inline-block;
  padding: 14px 36px;
  border-radius: 4px;
  font-weight: 600;
  font-size: 15px;
  cursor: pointer;
  border: none;
  font-family: var(--font-main);
  transition: background var(--transition), color var(--transition), transform var(--transition);
}

.btn-primary {
  background: var(--color-green);
  color: var(--color-white);
}

.btn-primary:hover {
  background: var(--color-medium-blue);
  color: var(--color-white);
  transform: translateY(-1px);
}

/* ================= HERO ================= */
.hero {
  background: linear-gradient(160deg, var(--color-dark-blue) 0%, var(--color-medium-blue) 100%);
  color: var(--color-white);
  padding: clamp(72px, 10vw, 120px) 0 clamp(80px, 12vw, 120px);
  text-align: center;
}

.hero-logo {
  height: clamp(64px, 12vw, 100px);
  width: auto;
  margin: 0 auto clamp(28px, 4vw, 40px);
}

.hero-headline {
  max-width: 960px;
  margin: 0 auto 24px;
  letter-spacing: -0.02em;
}

.hero-line {
  display: block;
  font-size: clamp(28px, 4.2vw, 46px);
  font-weight: 700;
  line-height: 1.2;
}

@media (min-width: 960px) {
  .hero-headline {
    display: flex;
    flex-wrap: nowrap;
    justify-content: center;
    gap: 0.35em;
    white-space: nowrap;
  }

  .hero-line {
    display: inline;
    font-size: clamp(32px, 3.2vw, 44px);
  }
}

.hero-subtitle {
  font-size: clamp(16px, 2.2vw, 20px);
  max-width: 720px;
  margin: 0 auto;
  color: var(--color-light-gray);
  font-weight: 400;
  line-height: 1.7;
}

/* ================= SECTIONS ================= */
.section {
  padding: var(--section-padding) 0;
}

.section-alt {
  background: var(--color-light-gray);
}

.section-contact {
  background: var(--color-white);
}

.section-title {
  font-size: clamp(26px, 3.5vw, 34px);
  color: var(--color-dark-blue);
  margin-bottom: 20px;
  text-align: center;
  letter-spacing: -0.02em;
}

.section-intro {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 48px;
  color: var(--color-medium-blue);
  font-size: 17px;
  line-height: 1.7;
}

.section-intro--stacked {
  display: flex;
  flex-direction: column;
  gap: 12px;
  max-width: 820px;
}

.section-intro--stacked p {
  margin: 0;
}

.section-intro--left {
  text-align: left;
  max-width: none;
}

.subsection {
  margin-top: 40px;
}

.subsection-title {
  color: var(--color-medium-blue);
  font-size: 20px;
  margin-bottom: 20px;
  padding-left: 14px;
  border-left: 4px solid var(--color-green);
}

.subsection p {
  color: var(--color-medium-blue);
  max-width: 800px;
}

.geographies-text {
  max-width: none;
}

@media (min-width: 768px) {
  .geographies-text {
    white-space: nowrap;
  }
}

/* ================= INDUSTRIES GRID ================= */
.industries-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
}

.industry-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  background: var(--color-light-gray);
  border: 1px solid rgba(0, 33, 71, 0.08);
  border-radius: 6px;
  padding: 28px 16px;
  text-align: center;
  transition: box-shadow var(--transition), transform var(--transition);
}

.industry-card:hover {
  box-shadow: 0 4px 16px rgba(0, 33, 71, 0.1);
  transform: translateY(-2px);
}

.industry-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  color: var(--color-medium-blue);
}

.industry-icon svg {
  width: 48px;
  height: 48px;
}

.industry-label {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-dark-blue);
  line-height: 1.35;
}

/* ================= PILLAR NAV ================= */
.pillar-nav {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin-bottom: 40px;
}

.pillar-nav-card {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 72px;
  padding: 16px 14px;
  background: var(--color-white);
  border: 1px solid rgba(0, 33, 71, 0.12);
  border-radius: 6px;
  color: var(--color-medium-blue);
  font-size: 14px;
  font-weight: 600;
  text-align: center;
  line-height: 1.35;
  transition: background var(--transition), border-color var(--transition), color var(--transition), transform var(--transition);
}

.pillar-nav-card:hover {
  background: var(--color-medium-blue);
  border-color: var(--color-medium-blue);
  color: var(--color-white);
  transform: translateY(-2px);
}

/* ================= PILLARS (SERVICES + PROBLEMS) ================= */
.pillars {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.pillar {
  background: var(--color-white);
  border-radius: 6px;
  border: 1px solid rgba(0, 33, 71, 0.1);
  overflow: hidden;
  scroll-margin-top: calc(var(--header-height) + 16px);
}

.pillar--flagship {
  border: 2px solid var(--color-medium-blue);
  box-shadow: 0 2px 12px rgba(0, 33, 71, 0.06);
}

.pillar-title {
  background: var(--color-medium-blue);
  color: var(--color-white);
  font-size: 20px;
  padding: 16px 28px;
  margin: 0;
}

.pillar-columns {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
}

.pillar-col {
  padding: 28px 32px;
}

.pillar-col:first-child {
  border-right: 1px solid rgba(0, 33, 71, 0.08);
}

.pillar-col-title {
  color: var(--color-medium-blue);
  font-size: 14px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 16px;
}

/* ================= WORKING STYLE ================= */
.principles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.principle-card {
  background: var(--color-light-gray);
  padding: 32px;
  border-radius: 6px;
  border-top: 3px solid var(--color-medium-blue);
}

.principle-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  margin-bottom: 16px;
  color: var(--color-green);
}

.principle-icon svg {
  width: 40px;
  height: 40px;
}

.principle-title {
  color: var(--color-medium-blue);
  font-size: 18px;
  margin-bottom: 12px;
}

.principle-card p {
  font-size: 15px;
  color: var(--color-dark-blue);
}

/* ================= WHY OPUS ================= */
.value-props {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-bottom: 48px;
}

.value-card {
  padding: 28px 32px;
  border-radius: 6px;
  background: var(--color-white);
  border-left: 4px solid var(--color-green);
}

.value-title {
  color: var(--color-medium-blue);
  font-size: 17px;
  margin-bottom: 10px;
}

.value-card p {
  font-size: 15px;
  color: var(--color-dark-blue);
}

.value-card:last-child:nth-child(odd) {
  grid-column: 1 / -1;
  max-width: 560px;
  justify-self: center;
}

.testimonial {
  max-width: 800px;
  margin: 0 auto;
  padding: 40px 48px;
  background: var(--color-dark-blue);
  color: var(--color-white);
  border-radius: 6px;
  text-align: center;
  position: relative;
}

.testimonial::before {
  content: "\201C";
  position: absolute;
  top: 12px;
  left: 24px;
  font-size: 64px;
  line-height: 1;
  color: var(--color-cyan);
  opacity: 0.4;
  font-family: Georgia, serif;
}

.testimonial p {
  font-size: 18px;
  font-style: italic;
  line-height: 1.7;
  margin-bottom: 20px;
  position: relative;
  z-index: 1;
}

.testimonial footer {
  font-size: 14px;
  color: var(--color-light-gray);
}

.testimonial cite {
  font-style: normal;
  font-weight: 500;
}

/* ================= OUR VALUES ================= */
.values-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.value-item {
  background: var(--color-light-gray);
  padding: 32px;
  border-radius: 6px;
}

.value-item-title {
  color: var(--color-medium-blue);
  font-size: 18px;
  margin-bottom: 10px;
}

.value-item p {
  font-size: 15px;
  color: var(--color-dark-blue);
}

/* ================= CONTACT FORM ================= */
.contact-form {
  max-width: 560px;
  margin: 0 auto;
  background: var(--color-light-gray);
  padding: 40px;
  border-radius: 6px;
}

.form-row {
  margin-bottom: 20px;
}

.form-row label {
  display: block;
  margin-bottom: 6px;
  font-weight: 600;
  font-size: 14px;
  color: var(--color-medium-blue);
}

.form-row input,
.form-row textarea {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid rgba(0, 33, 71, 0.15);
  border-radius: 4px;
  font-family: var(--font-main);
  font-size: 15px;
  color: var(--color-dark-blue);
  background: var(--color-white);
  transition: border-color var(--transition), box-shadow var(--transition);
}

.form-row input:focus,
.form-row textarea:focus {
  outline: none;
  border-color: var(--color-cyan);
  box-shadow: 0 0 0 3px rgba(52, 181, 186, 0.2);
}

.form-row textarea {
  resize: vertical;
  min-height: 120px;
}

.contact-form .btn-primary {
  width: 100%;
  margin-top: 8px;
}

/* ================= FOOTER ================= */
.site-footer {
  background: var(--color-dark-blue);
  color: var(--color-dark-gray);
  padding: 28px 0;
}

.footer-inner {
  text-align: center;
  font-size: 13px;
  line-height: 1.6;
}

/* ================= RESPONSIVE — TABLET ================= */
@media (max-width: 1024px) {
  .industries-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .pillar-nav {
    grid-template-columns: repeat(2, 1fr);
  }

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

  .value-props {
    grid-template-columns: 1fr;
  }

  .value-card:last-child:nth-child(odd) {
    grid-column: auto;
    max-width: none;
  }
}

@media (max-width: 900px) {
  .industries-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .pillar-columns {
    grid-template-columns: 1fr;
  }

  .pillar-col:first-child {
    border-right: none;
    border-bottom: 1px solid rgba(0, 33, 71, 0.08);
  }
}

/* ================= RESPONSIVE — MOBILE NAV ================= */
@media (max-width: 900px) {
  .nav-toggle {
    display: flex;
  }

  .main-nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--color-dark-blue);
    flex-direction: column;
    align-items: stretch;
    padding: 16px 24px 24px;
    gap: 0;
    transform: translateY(-8px);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity var(--transition), transform var(--transition), visibility var(--transition);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
    max-height: calc(100vh - var(--header-height));
    overflow-y: auto;
  }

  .main-nav.open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
  }

  .main-nav a {
    padding: 14px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    white-space: normal;
  }

  .main-nav a:last-child {
    border-bottom: none;
  }
}

/* ================= RESPONSIVE — MOBILE ================= */
@media (max-width: 640px) {
  .industries-grid,
  .principles-grid,
  .values-grid,
  .pillar-nav {
    grid-template-columns: 1fr;
  }

  .hero-headline {
    display: block;
  }

  .hero-line {
    display: block;
  }

  .testimonial {
    padding: 32px 24px;
  }

  .testimonial p {
    font-size: 16px;
  }

  .contact-form {
    padding: 28px 20px;
  }

  .hero {
    text-align: left;
  }

  .hero-logo {
    margin-left: 0;
    margin-right: auto;
  }

  .hero-subtitle {
    margin-left: 0;
    margin-right: 0;
  }

  .pillar-col {
    padding: 24px 20px;
  }
}