/* ============================================================
   MUHAMMAD ZULQARNAIN — PROFESSIONAL PORTFOLIO
   ============================================================ */


/* ---------- DESIGN SYSTEM ---------- */

:root {
  --navy: #0b1f33;
  --navy-light: #173b5f;
  --blue: #1769aa;
  --blue-bright: #2488c7;
  --cyan: #32a6c9;

  --text: #243746;
  --text-light: #61717e;
  --white: #ffffff;

  --background: #ffffff;
  --background-soft: #f4f7f9;
  --background-blue: #edf5fa;

  --border: #dce5eb;

  --shadow:
    0 12px 35px rgba(11, 31, 51, 0.08);

  --shadow-hover:
    0 18px 45px rgba(11, 31, 51, 0.14);

  --radius: 10px;

  --max-width: 1180px;
}


/* ---------- RESET ---------- */

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family:
    Inter,
    "Segoe UI",
    Roboto,
    Helvetica,
    Arial,
    sans-serif;

  color: var(--text);
  background: var(--background);
  line-height: 1.65;

  -webkit-font-smoothing: antialiased;
}


/* ---------- GENERAL ---------- */

.container {
  width: min(92%, var(--max-width));
  margin: 0 auto;
}

.section {
  padding: 100px 0;
}

a {
  color: inherit;
  text-decoration: none;
}

h1,
h2,
h3 {
  color: var(--navy);
  line-height: 1.2;
}

p {
  color: var(--text-light);
}

.section-kicker,
.eyebrow {
  color: var(--blue);
  font-size: 0.88rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.section-heading {
  max-width: 700px;
  margin-bottom: 55px;
}

.section-heading h2 {
  margin: 10px 0 18px;
  font-size: clamp(2rem, 4vw, 2.7rem);
  letter-spacing: -0.025em;
}

.section-heading > p:last-child {
  font-size: 1.05rem;
}


/* ============================================================
   NAVIGATION
   ============================================================ */

.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;

  background: rgba(255, 255, 255, 0.96);
  border-bottom: 1px solid var(--border);

  backdrop-filter: blur(10px);
}

.nav-container {
  min-height: 76px;

  display: flex;
  align-items: center;
  justify-content: space-between;

  gap: 30px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 13px;
}

.brand-mark {
  width: 42px;
  height: 42px;

  display: grid;
  place-items: center;

  border-radius: 50%;

  color: white;
  background:
    linear-gradient(
      135deg,
      var(--navy-light),
      var(--blue-bright)
    );

  font-size: 0.85rem;
  font-weight: 800;
  letter-spacing: 0.04em;
}

.brand-text {
  display: flex;
  flex-direction: column;
}

.brand-text strong {
  color: var(--navy);
  font-size: 0.94rem;
}

.brand-text small {
  margin-top: 1px;

  color: var(--text-light);
  font-size: 0.72rem;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 29px;
}

.main-nav a {
  position: relative;

  color: #3c4d5a;

  font-size: 0.87rem;
  font-weight: 600;
}

.main-nav a::after {
  content: "";

  position: absolute;
  left: 0;
  bottom: -8px;

  width: 0;
  height: 2px;

  background: var(--blue);

  transition: width 0.2s ease;
}

.main-nav a:hover {
  color: var(--blue);
}

.main-nav a:hover::after {
  width: 100%;
}


/* ============================================================
   HERO
   ============================================================ */

.hero {
  position: relative;
  overflow: hidden;

  padding: 95px 0 100px;

  background:
    radial-gradient(
      circle at 90% 20%,
      rgba(50, 166, 201, 0.13),
      transparent 25%
    ),
    linear-gradient(
      115deg,
      #f7fafc 0%,
      #ffffff 48%,
      #edf6fa 100%
    );
}

.hero::before {
  content: "";

  position: absolute;
  top: 0;
  right: -150px;

  width: 520px;
  height: 520px;

  border: 1px solid rgba(23, 105, 170, 0.08);
  border-radius: 50%;
}

.hero::after {
  content: "";

  position: absolute;
  right: 70px;
  bottom: -260px;

  width: 500px;
  height: 500px;

  border: 1px solid rgba(23, 105, 170, 0.07);
  border-radius: 50%;
}

.hero-grid {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: 1fr 1.15fr;
  align-items: center;
  gap: 40px;
}
.hero-photo {
  position: absolute;
  left: -310px;
  top: 50%;
  transform: translateY(-50%);
  width: 200px;
  height: 200px;
}

.hero-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  border-radius: 50%;
  display: block;
  box-shadow: 0 12px 30px rgba(11, 31, 51, 0.16);
}

.eyebrow {
  margin-bottom: 20px;
}

.hero h1 {
  max-width: 700px;

  font-size: clamp(2.8rem, 5vw, 4.2rem);
  letter-spacing: -0.055em;
}

.hero h1 span {
  color: var(--blue);
}

.hero h2 {
  margin-top: 25px;

  color: var(--text);

  font-size: clamp(1.3rem, 2vw, 1.75rem);
  font-weight: 600;
  letter-spacing: -0.02em;
}

.hero h2 span {
  display: inline-block;
  margin-top: 5px;

  color: var(--blue);
  font-size: 0.82em;
  font-weight: 600;
}

.hero-intro {
  max-width: 680px;

  margin-top: 28px;

  font-size: 1.08rem;
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;

  margin-top: 38px;
}


/* ---------- BUTTONS ---------- */

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;

  min-height: 48px;
  padding: 0 24px;

  border-radius: 5px;

  font-size: 0.88rem;
  font-weight: 700;

  transition:
    transform 0.2s ease,
    box-shadow 0.2s ease,
    background 0.2s ease;
}

.button:hover {
  transform: translateY(-2px);
}

.button-primary {
  color: white;
  background: var(--blue);

  box-shadow:
    0 7px 18px rgba(23, 105, 170, 0.2);
}

.button-primary:hover {
  background: #125c97;
}

.button-secondary {
  color: var(--navy);
  background: white;

  border: 1px solid #c9d7e0;
}

.button-secondary:hover {
  border-color: var(--blue);
}


/* ---------- HERO ENGINEERING VISUAL ---------- */

.hero-visual {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-workflow-image {
  display: block;
  width: 100%;
  max-width: none;
  height: auto;
  margin-left: 50px;
  border-radius: 12px;
  box-shadow: 0 18px 45px rgba(11, 31, 51, 0.14);

  transform: scale(1.30);
  transform-origin: left center;
}

.visual-card {
  position: relative;
  overflow: hidden;

  padding: 34px;

  background:
    linear-gradient(
      145deg,
      #0d2943,
      #174d72
    );

  border-radius: 14px;

  box-shadow:
    0 25px 55px rgba(11, 31, 51, 0.23);
}

.visual-card::after {
  content: "";

  position: absolute;
  right: -80px;
  bottom: -110px;

  width: 270px;
  height: 270px;

  border: 40px solid rgba(255, 255, 255, 0.035);
  border-radius: 50%;
}

.visual-label {
  position: relative;
  z-index: 2;

  margin-bottom: 27px;

  color: #8bd0e4;

  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.18em;
}

.workflow {
  position: relative;
  z-index: 2;

  display: flex;
  flex-direction: column;
}

.workflow-item {
  padding: 18px 20px;

  background: rgba(255, 255, 255, 0.07);

  border: 1px solid rgba(255, 255, 255, 0.11);
  border-radius: 7px;
}

.workflow-item strong {
  display: block;

  color: white;

  font-size: 0.86rem;
  letter-spacing: 0.08em;
}

.workflow-item span {
  display: block;

  margin-top: 3px;

  color: #c4d9e6;
  font-size: 0.78rem;
}

.workflow-arrow {
  padding: 6px 0 6px 22px;

  color: #61bed7;

  font-size: 1.15rem;

  transform: rotate(90deg);
  transform-origin: 29px center;
}

.visual-tagline {
  position: relative;
  z-index: 2;

  margin-top: 27px;
  padding-top: 22px;

  border-top: 1px solid rgba(255, 255, 255, 0.13);

  color: #d9e8ef;

  font-size: 0.78rem;
}


/* ============================================================
   EXPERTISE
   ============================================================ */

.expertise-section {
  background: white;
}

.expertise-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);

  gap: 22px;
}
.expertise-card {
  position: relative;

  min-height: 345px;
  padding: 30px 26px;

  background: white;

  border: 1px solid var(--border);
  border-radius: var(--radius);

  transition:
    transform 0.25s ease,
    box-shadow 0.25s ease,
    border-color 0.25s ease;
}

.expertise-card:hover {
  transform: translateY(-6px);

  border-color: #bad2e1;

  box-shadow: var(--shadow-hover);
}

.card-number {
  margin-bottom: 38px;

  color: var(--blue-bright);

  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.1em;
}

.expertise-card h3 {
  margin-bottom: 16px;

  font-size: 1.23rem;
}

.expertise-card p {
  font-size: 0.91rem;
  line-height: 1.7;
}


/* ---------- TAGS ---------- */

.tags {
  display: flex;
  flex-wrap: wrap;

  gap: 7px;

  margin-top: 22px;
}

.tags span {
  padding: 5px 9px;

  color: #31556e;
  background: #edf5f9;

  border-radius: 4px;

  font-size: 0.67rem;
  font-weight: 700;
}


/* ============================================================
   PROJECTS
   ============================================================ */

.projects-section {
  background: var(--background-soft);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);

  gap: 25px;
}

.project-card {
  overflow: hidden;

  display: flex;
  flex-direction: column;

  background: white;

  border: 1px solid var(--border);
  border-radius: var(--radius);

  box-shadow:
    0 7px 25px rgba(11, 31, 51, 0.045);

  transition:
    transform 0.25s ease,
    box-shadow 0.25s ease;
}

.project-card:hover {
  transform: translateY(-6px);

  box-shadow: var(--shadow-hover);
}

.project-visual {
  position: relative;

  min-height: 220px;
  padding: 25px;

  display: flex;
  align-items: flex-end;

  overflow: hidden;
}
.project-visual-image {
  padding: 0;
  position: relative;
  background: #eaf3f8;
}

.project-visual-image img {
  width: 100%;
  height: 220px;
  display: block;
  object-fit: cover;
  object-position: center;
}

.project-visual-image .project-category {
  z-index: 2;
  background: rgba(7, 35, 57, 0.88);
  backdrop-filter: blur(3px);
}
.project-visual::before {
  content: "";

  position: absolute;
  inset: 0;

  opacity: 0.9;
}

.project-visual-gom {
  background:
    radial-gradient(
      circle at 70% 40%,
      rgba(75, 190, 215, 0.65),
      transparent 20%
    ),
    linear-gradient(
      145deg,
      #092b45,
      #12608a 55%,
      #49a8bd
    );
}

.project-visual-reservoir {
  background:
    linear-gradient(
      165deg,
      #102b3e,
      #315c72 45%,
      #91b5bf
    );
}

.project-visual-data {
  background:
    linear-gradient(
      145deg,
      #102d46,
      #1f668b 55%,
      #73b8c8
    );
}

.project-category {
  position: absolute;
  top: 20px;
  left: 22px;

  padding: 6px 9px;

  color: white;
  background: rgba(5, 26, 42, 0.42);

  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 3px;

  font-size: 0.58rem;
  font-weight: 800;
  letter-spacing: 0.1em;
}

.project-placeholder {
  position: relative;
  z-index: 2;

  color: rgba(255, 255, 255, 0.76);

  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.project-placeholder strong {
  display: block;

  margin-top: 4px;

  color: white;

  font-size: 1.35rem;
  line-height: 1.2;
  letter-spacing: -0.01em;
  text-transform: none;
}

.project-content {
  flex: 1;

  display: flex;
  flex-direction: column;

  padding: 29px 27px 30px;
}

.project-content h3 {
  margin-bottom: 15px;

  font-size: 1.3rem;
}

.project-content p {
  font-size: 0.9rem;
  line-height: 1.7;
}

.project-content .tags {
  margin-bottom: 25px;
}

.project-link {
  margin-top: auto;

  color: var(--blue);

  font-size: 0.84rem;
  font-weight: 700;
}

.project-link:hover {
  color: var(--navy);
}


/* ============================================================
   IMPACT STRIP
   ============================================================ */

.impact-section {
  padding: 54px 0;

  background: var(--navy);
}

.impact-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);

  gap: 25px;
}

.impact-item {
  padding: 0 25px;

  border-left:
    1px solid rgba(255, 255, 255, 0.16);
}

.impact-item:first-child {
  border-left: 0;
}

.impact-item strong {
  display: block;

  color: #75c5dc;

  font-size: 1.65rem;
  font-weight: 700;
}

.impact-item span {
  display: block;

  margin-top: 5px;

  color: #d1dee6;

  font-size: 0.78rem;
  line-height: 1.5;
}


/* ============================================================
   RESEARCH
   ============================================================ */

.research-section {
  background: white;
}

.research-grid {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;

  gap: 90px;
}

.research-grid h2 {
  margin-top: 10px;

  max-width: 470px;

  font-size: clamp(2rem, 4vw, 2.8rem);
  letter-spacing: -0.03em;
}

.research-content {
  padding-top: 8px;
}

.research-content p {
  margin-bottom: 20px;

  font-size: 1rem;
  line-height: 1.8;
}

.research-content strong {
  color: #344d5d;
}

.text-link {
  display: inline-block;

  margin-top: 8px;

  color: var(--blue);

  font-size: 0.87rem;
  font-weight: 700;
}
/* =========================================================
   SELECTED RESEARCH & PUBLICATIONS
   ========================================================= */

.publications-section {
  background: #f6f9fb;
}

.publications-header {
  max-width: 760px;
  margin-bottom: 48px;
}

.publications-header h2 {
  margin-top: 10px;
  margin-bottom: 16px;

  font-size: clamp(2rem, 4vw, 2.8rem);
  letter-spacing: -0.03em;
}

.publications-header > p:last-child {
  margin: 0;

  max-width: 700px;

  font-size: 1rem;
  line-height: 1.8;
}


/* Publication grid */

.publication-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));

  gap: 32px;
}


/* Individual publication card */

.publication-card {
  overflow: hidden;

  display: flex;
  flex-direction: column;

  background: white;

  border: 1px solid #dfe8ed;
  border-radius: 14px;

  box-shadow: 0 8px 25px rgba(11, 31, 51, 0.06);

  transition:
    transform 0.2s ease,
    box-shadow 0.2s ease;
}

.publication-card:hover {
  transform: translateY(-4px);

  box-shadow: 0 14px 34px rgba(11, 31, 51, 0.10);
}


/* Figure area */

.publication-visual {
  position: relative;

  width: 100%;
  height: 270px;

  overflow: hidden;

  background: #eaf1f5;

  border-bottom: 1px solid #dfe8ed;
}

.publication-visual img {
  width: 100%;
  height: 100%;

  display: block;

  object-fit: contain;

  background: #eaf1f5;
}


/* Temporary placeholder */

.publication-placeholder {
  display: flex;
  align-items: center;
  justify-content: center;

  color: #7b8d99;

  font-size: 0.82rem;
  font-weight: 700;

  letter-spacing: 0.08em;
  text-transform: uppercase;
}


/* Card text */

.publication-content {
  display: flex;
  flex-direction: column;
  flex: 1;

  padding: 28px 30px 30px;
}

.publication-meta {
  margin: 0 0 12px;

  color: var(--blue);

  font-size: 0.72rem;
  font-weight: 800;

  letter-spacing: 0.08em;
  line-height: 1.5;

  text-transform: uppercase;
}

.publication-content h3 {
  margin: 0 0 14px;

  color: #173042;

  font-size: 1.22rem;
  line-height: 1.4;

  letter-spacing: -0.015em;
}

.publication-content > p:not(.publication-meta) {
  margin: 0 0 20px;

  color: #5e7180;

  font-size: 0.92rem;
  line-height: 1.7;
}

.publication-card-wide .publication-content .text-link {
  margin-top: 28px;
}


/* Wide BOEM / CFD card */

.publication-card-wide {
  grid-column: 1 / -1;

  display: grid;
  grid-template-columns: 1.25fr 1fr;
}

.publication-card-wide .publication-visual {
  height: 100%;
  min-height: 330px;

  border-bottom: 0;
  border-right: 1px solid #dfe8ed;
}

.publication-card-wide .publication-content {
  justify-content: center;

  padding: 38px;
}


/* Google Scholar */

.publications-footer {
  display: flex;
  justify-content: center;

  margin-top: 42px;
}

/* ============================================================
   ABOUT
   ============================================================ */

.about-section {
  background: var(--background-blue);
}

.about-grid {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;

  gap: 90px;
}

.about-title h2 {
  margin-top: 10px;

  max-width: 480px;

  font-size: clamp(2rem, 4vw, 2.8rem);
  letter-spacing: -0.03em;
}

.about-content > p {
  margin-bottom: 18px;

  font-size: 1rem;
  line-height: 1.8;
}

.education-list {
  margin-top: 38px;

  border-top: 1px solid #ccdde7;
}

.education-list div {
  display: flex;
  justify-content: space-between;

  gap: 30px;

  padding: 16px 0;

  border-bottom: 1px solid #ccdde7;
}

.education-list strong {
  color: var(--navy);

  font-size: 0.86rem;
}

.education-list span {
  color: var(--text-light);

  font-size: 0.78rem;
  text-align: right;
}


/* ============================================================
   CONTACT
   ============================================================ */

.contact-section {
  padding: 90px 0;

  text-align: center;

  background:
    linear-gradient(
      130deg,
      #0a2237,
      #12466a
    );
}

.contact-content {
  max-width: 780px;
}

.contact-section .section-kicker {
  color: #6fc5dc;
}

.contact-section h2 {
  margin: 10px 0 18px;

  color: white;

  font-size: clamp(2rem, 4vw, 2.7rem);
}

.contact-section p {
  color: #c5d9e5;
}

.contact-links {
  display: flex;
  justify-content: center;
  gap: 12px;

  margin-top: 30px;
}

.contact-links a {
  min-width: 120px;
  padding: 10px 20px;

  color: white;

  border:
    1px solid rgba(255, 255, 255, 0.3);
  border-radius: 4px;

  font-size: 0.82rem;
  font-weight: 700;

  transition:
    background 0.2s ease,
    border-color 0.2s ease;
}

.contact-links a:hover {
  background: rgba(255, 255, 255, 0.1);

  border-color:
    rgba(255, 255, 255, 0.55);
}


/* ============================================================
   FOOTER
   ============================================================ */

.site-footer {
  padding: 25px 0;

  background: #071a2b;

  border-top:
    1px solid rgba(255, 255, 255, 0.07);
}

.footer-content {
  display: flex;
  justify-content: space-between;

  gap: 25px;

  color: #8398a7;

  font-size: 0.69rem;
}

/* ============================================================
   RESPONSIVE DESIGN
   ============================================================ */

@media (max-width: 1000px) {
   .hero-photo {
    position: relative;
    left: auto;
    top: auto;
    transform: none;
    width: 150px;
    height: 150px;
    margin: 0 auto 20px;
  }

  .hero-photo img {
    width: 100%;
    height: 100%;
  }

  .hero-workflow-image {
    transform: scale(1);
    margin-left: 0;
    width: 100%;
    max-width: 100%;
  }
   
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 55px;
  }

  .hero-content {
    max-width: 780px;
  }

  .hero-visual {
    max-width: 650px;
  }

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

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

  .research-grid,
  .about-grid {
    gap: 55px;
  }
   .publication-grid {
  grid-template-columns: 1fr;
}

.publication-card-wide {
  grid-column: auto;

  display: flex;
  flex-direction: column;
}

.publication-card-wide .publication-visual {
  height: 270px;
  min-height: 0;

  border-right: 0;
  border-bottom: 1px solid #dfe8ed;
}

.publication-card-wide .publication-content {
  padding: 28px 30px 30px;
}

.publications-header {
  margin-bottom: 36px;
}
}


@media (max-width: 760px) {

  .section {
    padding: 75px 0;
  }

  .nav-container {
    min-height: 68px;
  }

  .brand-text small {
    display: none;
  }

  .main-nav {
    display: none;
  }

  .hero {
    padding: 85px 0;
  }

  .hero-grid {
    gap: 45px;
  }

  .hero h1 {
    font-size: 3.1rem;
  }

  .expertise-grid,
  .projects-grid,
  .impact-grid,
  .research-grid,
  .about-grid {
    grid-template-columns: 1fr;
  }

  .expertise-card {
    min-height: auto;
  }

  .impact-grid {
    gap: 0;
  }

  .impact-item,
  .impact-item:first-child {
    padding: 20px 0;

    border-left: 0;

    border-bottom:
      1px solid rgba(255, 255, 255, 0.13);
  }

  .impact-item:last-child {
    border-bottom: 0;
  }

  .research-grid,
  .about-grid {
    gap: 35px;
  }

  .education-list div {
    flex-direction: column;
    gap: 4px;
  }

  .education-list span {
    text-align: left;
  }

  .footer-content {
    flex-direction: column;
    gap: 6px;
  }

}


@media (max-width: 480px) {

  .hero h1 {
    font-size: 2.65rem;
  }

  .hero-actions,
  .contact-links {
    flex-direction: column;
  }

  .button,
  .contact-links a {
    width: 100%;
  }

  .visual-card {
    padding: 25px;
  }

}