/* ===============================
   EXEL NAKANO — PURE BLACK & WHITE
   CENTERED SHARP MINIMAL — IMPROVED + BURGER MENU
   =============================== */

:root {
  --white: #fff;
  --black: #000;
  --gray: #888;
  --transition: all 0.3s ease;
  --max-width: 900px;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 100px;
}

body {
  background: var(--black);
  color: var(--white);
  font-family: "Inter", sans-serif;
  line-height: 1.8;
  letter-spacing: 0.01em;
  overflow-x: hidden;
}

/* ===== WRAPPER ===== */
.wrapper {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
}

/* ===== HEADER ===== */
.header {
  position: fixed;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100%;
  background: rgba(0, 0, 0, 0.9);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.2);
  z-index: 1000;
  display: flex;
  justify-content: center;
}

.nav {
  width: 100%;
  max-width: var(--max-width);
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.2rem 2rem;
}

.brand-logo {
  font-size: 2rem;
  font-weight: 800;
  text-decoration: none;
  color: var(--white);
  letter-spacing: -0.03em;
  transition: var(--transition);
}

.brand-logo:hover {
  opacity: 0.8;
  transform: scale(1.05);
}

.nav-menu {
  display: flex;
  gap: 2.2rem;
  margin-left: auto;
}

.nav-link {
  color: var(--white);
  text-decoration: none;
  font-weight: 500;
  opacity: 0.75;
  position: relative;
  transition: var(--transition);
}

.nav-link:hover {
  opacity: 1;
}

.nav-link::after {
  content: "";
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0%;
  height: 1px;
  background: var(--white);
  transition: var(--transition);
}

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

/* ===== NAV TOGGLE (Burger Button) ===== */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 6px;
  width: 30px;
  height: 24px;
  cursor: pointer;
}

.toggle-bar {
  display: block;
  width: 100%;
  height: 3px;
  background: var(--white);
  border-radius: 2px;
  transition: var(--transition);
}

/* Burger active animation */
.nav-toggle.active .toggle-bar:nth-child(1) {
  transform: translateY(9px) rotate(45deg);
}
.nav-toggle.active .toggle-bar:nth-child(2) {
  opacity: 0;
}
.nav-toggle.active .toggle-bar:nth-child(3) {
  transform: translateY(-9px) rotate(-45deg);
}

/* ===== HERO ===== */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 180px 1rem 120px;
  max-width: var(--max-width);
  margin: 0 auto;
}

.hero-title {
  font-size: clamp(2.8rem, 6vw, 4.5rem);
  font-weight: 900;
  margin-bottom: 1.5rem;
  letter-spacing: -0.04em;
}

.hero-badge {
  font-size: 1.3rem;
  margin-bottom: 2.2rem;
  opacity: 0.8;
  text-transform: uppercase;
}

.hero-description {
  max-width: 650px;
  margin: 0 auto 3rem;
  font-size: 1.15rem;
  opacity: 0.9;
}

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 1rem 2.2rem;
  border: 1px solid var(--white);
  font-weight: 600;
  text-decoration: none;
  transition: var(--transition);
  cursor: pointer;
  letter-spacing: 0.02em;
  border-radius: 0;
}

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

.btn-primary:hover {
  background: var(--black);
  color: var(--white);
  transform: translateY(-2px);
}

.btn-secondary {
  background: transparent;
  color: var(--white);
}

.btn-secondary:hover {
  background: var(--white);
  color: var(--black);
  transform: translateY(-2px);
}

/* ===== SECTIONS ===== */
.section {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 9rem 2rem;
}

.section-title {
  font-size: 2.4rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 4rem;
  letter-spacing: -0.02em;
  position: relative;
}

.section-title::after {
  content: "";
  display: block;
  width: 80px;
  height: 1px;
  background: var(--white);
  margin: 1rem auto 0;
  opacity: 0.6;
}

/* ===== ABOUT ===== */
.about-main {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  gap: 4rem;
  margin-bottom: 4rem;
  text-align: left;
}

.about-image {
  flex: 1;
  max-width: 320px;
  border: 1px solid var(--white);
  overflow: hidden;
}

.about-image img {
  width: 100%;
  display: block;
  filter: grayscale(100%);
  transition: var(--transition);
}

.about-image:hover img {
  filter: grayscale(0);
  transform: scale(1.04);
}

.about-text {
  flex: 1.2;
}

.about-description {
  font-size: 1.05rem;
  opacity: 0.9;
  margin-bottom: 2rem;
}

/* ===== SKILLS ===== */
.skills-section {
  margin-top: 3rem;
  text-align: left;
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 1.2rem;
}

.skill-item {
  border: 1px solid var(--white);
  padding: 1rem;
  text-align: center;
  opacity: 0.8;
  transition: var(--transition);
  font-size: 0.95rem;
}

.skill-item:hover {
  background: var(--white);
  color: var(--black);
  opacity: 1;
  transform: translateY(-3px);
}

/* ===== WORK ===== */
.work-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2.5rem;
}

.work-card {
  border: 1px solid var(--white);
  padding: 2.2rem;
  background: transparent;
  transition: var(--transition);
}

.work-card:hover {
  background: var(--white);
  color: var(--black);
  transform: translateY(-4px);
}

/* ===== CONTACT ===== */
.contact-content {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 4rem;
  text-align: left;
}

.form-label {
  display: block;
  margin-bottom: 0.75rem;
  font-weight: 500;
}

.form-input {
  width: 100%;
  padding: 0.9rem 1.2rem;
  border: 1px solid var(--white);
  background: var(--black);
  color: var(--white);
  margin-bottom: 1.5rem;
  transition: var(--transition);
}

.form-input:focus {
  outline: none;
  background: var(--white);
  color: var(--black);
}

/* ===== FOOTER ===== */
.footer {
  border-top: 1px solid rgba(255, 255, 255, 0.2);
  text-align: center;
  padding: 3rem 0;
  font-size: 0.95rem;
  opacity: 0.7;
  max-width: var(--max-width);
  margin: 0 auto;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 900px) {
  .about-main,
  .contact-content {
    flex-direction: column;
    display: flex;
    align-items: center;
    text-align: center;
    gap: 2.5rem;
  }

  .about-image {
    max-width: 260px;
  }

  .skills-section {
    text-align: center;
  }

  .hero-title {
    font-size: 3.2rem;
  }

  .section {
    padding: 7rem 1.5rem;
  }

  /* NAVIGATION */
  .nav-toggle {
    display: flex;
  }

  .nav-menu {
    display: none;
    flex-direction: column;
    align-items: flex-end;
    position: absolute;
    top: 100%;
    right: 2rem;
    background: rgba(0, 0, 0, 0.95);
    border: 1px solid var(--white);
    padding: 1.5rem 2rem;
    z-index: 999;
    animation: fadeIn 0.3s ease;
  }

  .nav-menu.active {
    display: flex;
  }

  .nav-link {
    margin-bottom: 1rem;
  }
}

/* ===== ANIMATION ===== */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}