/* Button Components */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-sm) var(--space-lg);
  font-weight: 600;
  letter-spacing: 0.05em;
  border: 2px solid;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
  text-decoration: none;
  cursor: pointer;
  font-size: var(--font-size-base);
  min-height: 44px;
  text-align: center;
}

.btn--primary {
  background: var(--color-secondary);
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.btn--fill-hover::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: var(--color-primary);
  transition: left var(--transition-base);
  z-index: 1;
}

.btn--fill-hover:hover::before {
  left: 0;
}

.btn--fill-hover span {
  position: relative;
  z-index: 2;
  transition: color var(--transition-base);
}

.btn--fill-hover:hover span {
  color: var(--color-secondary);
}

.btn--lift:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

/* Card Components */
.card {
  background: var(--color-secondary);
  border: 2px solid var(--color-border-light);
  padding: var(--space-xl);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.card--hover-lift:hover {
  border-color: var(--color-primary);
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

.card--accent-line::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 0;
  background: var(--color-primary);
  transition: height var(--transition-base);
}

.card--accent-line:hover::before {
  height: 100%;
}

/* Tag Components */
.tag {
  display: inline-block;
  padding: 0.4rem 0.8rem;
  font-size: 0.8rem;
  font-weight: 600;
  border: 1px solid var(--color-border);
  transition: all var(--transition-base);
}

.tag--skill {
  background: var(--color-secondary);
  color: var(--color-primary);
  border: 2px solid var(--color-border);
  padding: 0.7rem var(--space-md);
  position: relative;
  overflow: hidden;
}

.tag--skill::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 0;
  height: 100%;
  background: var(--color-primary);
  transition: width var(--transition-base);
  z-index: 1;
}

.tag--skill:hover::before {
  width: 100%;
}

.tag--skill span {
  position: relative;
  z-index: 2;
  transition: color var(--transition-base);
}

.tag--skill:hover span {
  color: var(--color-secondary);
}

.tag--tech {
  background: #f5f5f5;
  color: var(--color-primary);
}

/* Section Components */
.section {
  padding: var(--space-3xl) 0;
  position: relative;
}

.section__title {
  font-size: var(--font-size-4xl);
  font-weight: 800;
  text-align: center;
  margin-bottom: var(--space-2xl);
  letter-spacing: -0.02em;
  position: relative;
}

.section__title::before {
  content: '';
  position: absolute;
  width: 50px;
  height: 3px;
  background: var(--color-primary);
  bottom: -10px;
  left: 50%;
  transform: translateX(-50%);
}

.section__content {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

/* Animation Components */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: all 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Layout Components */
.container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.grid {
  display: grid;
  gap: var(--space-lg);
}

.grid--auto-fit {
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
}

.flex {
  display: flex;
}

.flex--center {
  align-items: center;
  justify-content: center;
}

.flex--wrap {
  flex-wrap: wrap;
}

.flex--gap {
  gap: var(--space-sm);
}