/* Color Palette */
:root {
  --color-white: #ffffff;
  --color-concrete: #4a4a4a;
  --color-concrete-light: #6d6d6d;
  --color-orange: #ff6b35;
  --color-border: #000000;
  --color-separator: #e0e0e0;

  /* Typography */
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial,
    sans-serif;
  --font-weight-bold: 700;
  --font-weight-heavy: 900;
}

.dark-mode {
  --color-white: #1a1a1a;
  --color-concrete: #e0e0e0;
  --color-concrete-light: #a0a0a0;
  --color-border: #ffffff;
  --color-separator: #333333;
}

/* Reset & Base */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  background-color: var(--color-white);
  color: var(--color-concrete);
  line-height: 1.6;
  font-size: 16px;
  transition:
    background-color 0.3s,
    color 0.3s;
}

/* Container & Grid */
.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 60px 40px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 60px;
}

/* Header */
.header {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 40px;
  align-items: flex-start;
  padding-bottom: 40px;
  border-bottom: 4px solid var(--color-border);
  transition: border-color 0.3s;
}

.header-content {
  display: grid;
  gap: 16px;
}

.name {
  font-size: 48px;
  font-weight: var(--font-weight-heavy);
  letter-spacing: -1px;
  color: var(--color-border);
  line-height: 1.1;
  transition: color 0.3s;
}

.tagline {
  font-size: 18px;
  color: var(--color-concrete);
  font-weight: 400;
  max-width: 400px;
}

.header-nav {
  display: flex;
  gap: 20px;
  padding-top: 8px;
  align-items: center;
}

.nav-link {
  font-size: 14px;
  font-weight: var(--font-weight-bold);
  text-decoration: none;
  color: var(--color-orange);
  border: 2px solid var(--color-orange);
  padding: 8px 16px;
  transition: all 0.2s ease;
}

.nav-link:hover {
  background-color: var(--color-orange);
  color: var(--color-white);
}

.theme-toggle {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--color-concrete);
  padding: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color 0.2s ease;
}

.theme-toggle:hover {
  color: var(--color-orange);
}

.dark-mode .theme-toggle {
  color: var(--color-concrete);
}

.dark-mode .theme-toggle:hover {
  color: var(--color-orange);
}

.theme-icon-moon {
  display: block;
}

.theme-icon-sun {
  display: none;
}

.dark-mode .theme-icon-moon {
  display: none;
}

.dark-mode .theme-icon-sun {
  display: block;
}

/* Sections */
.section {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 40px;
  align-items: start;
  border-left: 4px solid var(--color-border);
  padding-left: 40px;
  transition: border-color 0.3s;
}

.section-title {
  font-size: 20px;
  font-weight: var(--font-weight-heavy);
  letter-spacing: 1px;
  color: var(--color-border);
  text-transform: uppercase;
  padding-top: 6px;
  transition: color 0.3s;
}

.section-content {
  display: grid;
  gap: 32px;
}

/* About Section */
.about .section-content {
  grid-template-columns: 1fr;
}

.about .section-content p {
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-concrete);
  max-width: 600px;
}

/* Experience Items */
.experience-item {
  padding: 20px 0;
  border-bottom: 2px solid var(--color-separator);
}

.experience-item:first-child,
.experience-item:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.experience-header {
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: 20px;
  align-items: center;
  margin-bottom: 12px;
}

.experience-title {
  font-size: 18px;
  font-weight: var(--font-weight-bold);
  color: var(--color-border);
  transition: color 0.3s;
}

.experience-company {
  font-size: 14px;
  font-weight: var(--font-weight-bold);
  color: var(--color-orange);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.experience-date {
  font-size: 13px;
  color: var(--color-concrete);
  font-weight: 500;
  text-align: right;
  white-space: nowrap;
}

.experience-description {
  font-size: 15px;
  color: var(--color-concrete);
  line-height: 1.6;
}

/* Activity Items */
.activity-item {
  padding: 20px 0;
  border-bottom: 2px solid var(--color-separator);
}

.activity-item:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.activity-header {
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: 20px;
  align-items: center;
  margin-bottom: 12px;
}

.activity-title {
  font-size: 18px;
  font-weight: var(--font-weight-bold);
  color: var(--color-border);
  transition: color 0.3s;
}

.activity-stat {
  font-size: 14px;
  font-weight: var(--font-weight-bold);
  color: var(--color-orange);
}

.activity-date {
  font-size: 13px;
  color: var(--color-concrete);
  font-weight: 500;
  text-align: right;
  white-space: nowrap;
}

.activity-list {
  list-style: none;
  padding-left: 0;
}

.activity-list li {
  font-size: 15px;
  color: var(--color-concrete);
  line-height: 1.6;
  padding: 6px 0;
  padding-left: 20px;
  position: relative;
}

.activity-list li:before {
  content: "–";
  position: absolute;
  left: 0;
  color: var(--color-orange);
  font-weight: var(--font-weight-bold);
}

/* Responsive Design */
@media (max-width: 768px) {
  .container {
    padding: 40px 24px;
    gap: 40px;
  }

  .name {
    font-size: 36px;
  }

  .tagline {
    font-size: 16px;
  }

  .header {
    grid-template-columns: 1fr;
    gap: 24px;
    padding-bottom: 32px;
  }

  .section {
    grid-template-columns: 1fr;
    gap: 24px;
    padding-left: 24px;
  }

  .section-title {
    font-size: 18px;
    padding-top: 0;
  }

  .experience-header,
  .activity-header {
    grid-template-columns: 1fr;
    gap: 8px;
    align-items: flex-start;
  }

  .experience-date,
  .activity-date {
    text-align: left;
  }

  .activity-stat {
    display: none;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 32px 16px;
    gap: 32px;
  }

  .name {
    font-size: 28px;
  }

  .tagline {
    font-size: 14px;
  }

  .section-title {
    font-size: 16px;
  }

  .experience-title,
  .activity-title {
    font-size: 16px;
  }

  .nav-link {
    font-size: 12px;
    padding: 6px 12px;
  }
}