/* ============================================
   CSS Variables & Root Styles
   ============================================ */
:root {
  --color-primary: #627264;
  --color-primary-dark: #1f222b;
  --color-primary-light: #8f9294;
  --color-accent: #DDE0BD;
  --color-accent-dark: #D9AD76;
  --color-white: #ffffff;
  --color-black: #000000;
  --color-text: #333333;
  --color-text-light: #666666;
  
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  
  --shadow-small: 0 2px 4px rgba(0, 0, 0, 0.1);
  --shadow-medium: 0 4px 8px rgba(0, 0, 0, 0.15);
  --shadow-large: 0 8px 16px rgba(0, 0, 0, 0.2);
  --shadow-hover: 0 12px 24px rgba(0, 0, 0, 0.25);
  
  --transition-fast: 0.2s ease;
  --transition-medium: 0.3s ease;
  --transition-slow: 0.5s ease;
  
  --border-radius: 8px;
  --border-radius-large: 16px;
}

/* ============================================
   Reset & Base Styles
   ============================================ */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 62.5%; /* 1rem = 10px */
  scroll-behavior: smooth;
}

@media (max-width: 75em) {
  html {
    font-size: 56.25%; /* 1rem = 9px */
  }
}

@media (max-width: 56.25em) {
  html {
    font-size: 50%; /* 1rem = 8px */
  }
}

@media (max-width: 37.5em) {
  html {
    font-size: 45%; /* 1rem = 7.2px */
  }
}

body {
  font-family: var(--font-primary);
  font-weight: 400;
  font-size: 1.6rem;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-white);
  overflow-x: hidden;
}

/* ============================================
   Navigation
   ============================================ */
.navigation {
  position: fixed;
  top: 3rem;
  right: 3rem;
  z-index: 10000;
}

.navigation__toggle {
  background-color: var(--color-accent);
  height: 6rem;
  width: 6rem;
  border-radius: 50%;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-medium);
  transition: all var(--transition-medium);
  position: relative;
  z-index: 10001;
}

.navigation__toggle:hover {
  transform: scale(1.1);
  box-shadow: var(--shadow-large);
}

.navigation__icon {
  width: 3rem;
  height: 2rem;
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.navigation__icon span {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--color-black);
  transition: all var(--transition-medium);
}

.navigation__toggle[aria-expanded="true"] .navigation__icon span:nth-child(1) {
  transform: rotate(45deg) translate(0.7rem, 0.7rem);
}

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

.navigation__toggle[aria-expanded="true"] .navigation__icon span:nth-child(3) {
  transform: rotate(-45deg) translate(0.7rem, -0.7rem);
}

.navigation__background {
  height: 5rem;
  width: 5rem;
  border-radius: 50%;
  position: fixed;
  top: 3.5rem;
  right: 3.5rem;
  background: radial-gradient(circle, var(--color-primary-dark), var(--color-primary));
  z-index: 9999;
  transition: transform 0.8s cubic-bezier(0.86, 0, 0.07, 1);
  transform: scale(0);
}

.navigation__background.active {
  transform: scale(80);
}

.navigation__nav {
  height: 100vh;
  position: fixed;
  top: 0;
  left: 0;
  z-index: 10000;
  opacity: 0;
  width: 0;
  transition: opacity var(--transition-slow);
  pointer-events: none;
}

.navigation__nav.active {
  opacity: 1;
  width: 100%;
  pointer-events: all;
}

.navigation__list {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  list-style: none;
  text-align: center;
  width: 100%;
}

.navigation__item {
  margin: 1rem 0;
}

.navigation__link {
  display: inline-block;
  font-size: 3rem;
  font-weight: 300;
  padding: 1rem 2rem;
  color: var(--color-white);
  text-decoration: none;
  text-transform: uppercase;
  background-image: linear-gradient(120deg, transparent 0%, transparent 50%, var(--color-white) 50%);
  background-size: 220%;
  transition: all var(--transition-medium);
  position: relative;
}

.navigation__number {
  margin-right: 1.5rem;
  font-weight: 700;
  display: inline-block;
}

.navigation__link:hover,
.navigation__link:active {
  background-position: 100%;
  color: var(--color-primary-dark);
  transform: translateX(1rem);
}

@media (max-width: 56.25em) {
  .navigation {
    top: 2rem;
    right: 2rem;
  }
  
  .navigation__toggle {
    height: 5rem;
    width: 5rem;
  }
  
  .navigation__link {
    font-size: 2.5rem;
  }
}

/* ============================================
   Header
   ============================================ */
.header {
  height: 100vh;
  background-image: linear-gradient(
      to right bottom,
      rgba(31, 34, 43, 0.8),
      rgba(98, 114, 100, 0.8)
    ),
    url(../img/landing.jpg);
  background-size: cover;
  background-position: center;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.header__content {
  text-align: center;
  z-index: 10;
  animation: fadeInUp 1s ease-out;
}

.header__gradient {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 30rem;
  background: linear-gradient(
    to top,
    var(--color-primary-dark) 0%,
    transparent 100%
  );
  z-index: 1;
}

.heading-primary {
  color: var(--color-white);
  text-transform: uppercase;
  margin-bottom: 4rem;
}

.heading-primary__main {
  display: block;
  font-size: 4.5rem;
  font-weight: 900;
  letter-spacing: 1.5rem;
  animation: moveInLeft 1s ease-out;
  margin-bottom: 1.5rem;
}

.heading-primary__sub {
  display: block;
  font-size: 2rem;
  font-weight: 400;
  letter-spacing: 0.5rem;
  animation: moveInRight 1s ease-out;
}

@media (max-width: 75em) {
  .heading-primary__main {
    font-size: 3.5rem;
    letter-spacing: 1rem;
  }
  
  .heading-primary__sub {
    font-size: 1.6rem;
  }
}

@media (max-width: 56.25em) {
  .heading-primary__main {
    font-size: 2.5rem;
    letter-spacing: 0.5rem;
  }
  
  .heading-primary__sub {
    font-size: 1.4rem;
  }
}

/* ============================================
   Buttons
   ============================================ */
.btn,
.btn:link,
.btn:visited {
  display: inline-block;
  text-transform: uppercase;
  text-decoration: none;
  padding: 1.5rem 4rem;
  border-radius: var(--border-radius-large);
  transition: all var(--transition-medium);
  position: relative;
  font-size: 1.6rem;
  font-weight: 600;
  border: none;
  cursor: pointer;
  font-family: inherit;
}

.btn--primary {
  background-color: var(--color-accent);
  color: var(--color-primary-dark);
  box-shadow: var(--shadow-medium);
}

.btn--primary:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
  background-color: var(--color-accent-dark);
}

.btn--primary:active {
  transform: translateY(-1px);
  box-shadow: var(--shadow-small);
}

.btn--white {
  background-color: var(--color-white);
  color: var(--color-primary-dark);
  box-shadow: var(--shadow-small);
}

.btn--white:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-medium);
  background-color: var(--color-accent);
}

.btn--animated {
  animation: fadeInUp 0.8s ease-out 0.5s backwards;
}

@media (max-width: 37.5em) {
  .btn {
    padding: 1.2rem 3rem;
    font-size: 1.4rem;
  }
}

/* ============================================
   Main Content
   ============================================ */
.main {
  background-color: var(--color-primary-dark);
  padding: 10rem 0;
  margin-top: -20rem;
  position: relative;
  z-index: 5;
}

/* ============================================
   Section Styles
   ============================================ */
.section-portfolio,
.section-about,
.section-skills,
.section-recommendations,
.section-contact {
  padding: 8rem 0;
}

.section-description {
  font-size: 1.8rem;
  color: var(--color-accent);
  text-align: center;
  margin-top: 2rem;
  max-width: 70rem;
  margin-left: auto;
  margin-right: auto;
}

.heading-secondary {
  font-size: 3.5rem;
  letter-spacing: 0.5rem;
  text-transform: uppercase;
  font-weight: 700;
  text-align: center;
  background: linear-gradient(to right, var(--color-accent), var(--color-accent-dark));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 5rem;
  transition: all var(--transition-medium);
}

.heading-secondary:hover {
  transform: scale(1.05);
  text-shadow: 0 0.5rem 1rem rgba(221, 224, 189, 0.3);
}

.heading-secondary--light {
  color: var(--color-white);
  -webkit-text-fill-color: var(--color-white);
  background: none;
}

.heading-secondary--dark {
  color: var(--color-text);
  -webkit-text-fill-color: var(--color-text);
  background: none;
}

.heading-tertiary {
  font-size: 1.8rem;
  font-weight: 700;
  text-transform: uppercase;
  margin-bottom: 1rem;
}

.paragraph {
  font-size: 1.6rem;
  color: var(--color-accent);
  line-height: 1.8;
  margin-bottom: 2rem;
}

@media (max-width: 56.25em) {
  .heading-secondary {
    font-size: 2.5rem;
    letter-spacing: 0.3rem;
  }
  
  .section-portfolio,
  .section-about,
  .section-skills,
  .section-recommendations,
  .section-contact {
    padding: 6rem 0;
  }
}

/* ============================================
   Project Cards
   ============================================ */
.project-card {
  perspective: 150rem;
  -moz-perspective: 150rem;
  height: 35rem;
  position: relative;
}

.project-card__side {
  height: 35rem;
  transition: all 0.8s ease;
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  backface-visibility: hidden;
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: var(--shadow-large);
}

.project-card__side--front {
  background: linear-gradient(to bottom, var(--color-primary-light), var(--color-primary));
}

.project-card__side--back {
  background: linear-gradient(to bottom right, var(--color-accent), var(--color-accent-dark));
  transform: rotateY(180deg);
  display: flex;
  align-items: center;
  justify-content: center;
}

.project-card:hover .project-card__side--front {
  transform: rotateY(-180deg);
}

.project-card:hover .project-card__side--back {
  transform: rotateY(0);
}

.project-card__picture {
  background-size: cover;
  background-position: center;
  height: 18rem;
  clip-path: polygon(0 0, 100% 0, 100% 85%, 0 100%);
  position: relative;
}

.project-card__picture--1 {
  background-image: url(../img/ecommerce-new.jpg);
}

.project-card__picture--3 {
  background-image: url(../img/kimbo-flight.jpg);
}

.project-card__picture--5 {
  background-image: url(../img/youtube-clone.jpg);
}

.project-card__picture--9 {
  background-image: url(../img/lights-out.jpg);
}

.project-card__picture--10 {
  background-image: url(../img/todo-list.jpg);
}

.project-card__picture--11 {
  background-image: url(../img/hang-man.jpg);
}

.project-card__picture--12 {
  background-image: url(../img/yatzee-app.jpg);
}

.project-card__picture--13 {
  background-image: url(../img/africa-trivia.jpg);
}

.project-card__picture--15 {
  background-image: url(../img/vocabulary-center.jpg);
}

.project-card__picture--16 {
  background-image: url(../img/job-board.jpg);
}

.project-card__heading {
  font-size: 2rem;
  font-weight: 300;
  text-transform: uppercase;
  text-align: right;
  color: var(--color-white);
  position: absolute;
  top: 12rem;
  right: 2rem;
  width: 75%;
}

.project-card__heading-span {
  padding: 1rem 1.5rem;
  background-color: rgba(31, 34, 43, 0.85);
  box-decoration-break: clone;
  -webkit-box-decoration-break: clone;
  line-height: 1.6;
  display: inline-block;
}

.project-card__details {
  padding: 2rem;
}

.project-card__details ul {
  list-style: none;
  width: 100%;
  margin: 0 auto;
}

.project-card__details ul li {
  text-align: center;
  font-size: 1.4rem;
  padding: 1rem;
  color: var(--color-white);
}

.project-card__details ul li:not(:last-child) {
  border-bottom: 1px solid rgba(255, 255, 255, 0.2);
}

.project-card__cta {
  text-align: center;
  width: 90%;
}

.project-card__cta .btn {
  margin-bottom: 1.5rem;
  width: 100%;
  max-width: 20rem;
}

@media (max-width: 56.25em) {
  .project-card {
    height: auto;
    margin-bottom: 3rem;
  }
  
  .project-card__side {
    height: auto;
    min-height: 35rem;
    position: relative;
  }
  
  .project-card__side--back {
    transform: rotateY(0);
    margin-top: 2rem;
  }
  
  .project-card:hover .project-card__side--front {
    transform: rotateY(0);
  }
}

/* ============================================
   About Section
   ============================================ */
.about__image {
  margin-bottom: 3rem;
}

.about__photo {
  width: 100%;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-large);
  transition: all var(--transition-medium);
}

.about__photo:hover {
  transform: scale(1.05);
  box-shadow: var(--shadow-hover);
}

.about__content {
  padding-left: 2rem;
}

@media (max-width: 56.25em) {
  .about__content {
    padding-left: 0;
    margin-top: 3rem;
  }
}

/* ============================================
   Skills Section
   ============================================ */
.section-skills {
  background: linear-gradient(
      to right bottom,
      rgba(31, 34, 43, 0.9),
      rgba(98, 114, 100, 0.9)
    ),
    url(../img/stack-pic4.jpg);
  background-size: cover;
  background-position: center;
  background-attachment: fixed;
  position: relative;
}

.skill-box {
  background-color: rgba(221, 224, 189, 0.95);
  padding: 2.5rem;
  text-align: center;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-medium);
  transition: all var(--transition-medium);
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.skill-box:hover {
  transform: translateY(-1rem) scale(1.05);
  box-shadow: var(--shadow-hover);
  background-color: var(--color-white);
}

.skill-box__image {
  width: 100%;
  max-width: 12rem;
  height: auto;
  margin-bottom: 1.5rem;
  object-fit: contain;
}

.skill-box__title {
  font-size: 1.6rem;
  font-weight: 600;
  color: var(--color-primary-dark);
  text-transform: uppercase;
  letter-spacing: 0.1rem;
}

/* ============================================
   Recommendations Section
   ============================================ */
.section-recommendations {
  background-color: #f5f5f5;
  padding: 8rem 0;
}

.recommendation {
  background-color: var(--color-white);
  padding: 3rem;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-medium);
  margin-bottom: 3rem;
  display: flex;
  align-items: center;
  gap: 2rem;
  transition: all var(--transition-medium);
}

.recommendation:hover {
  transform: translateY(-0.5rem);
  box-shadow: var(--shadow-large);
}

.recommendation__shape {
  width: 12rem;
  height: 12rem;
  flex-shrink: 0;
  shape-outside: circle(50% at 50% 50%);
  clip-path: circle(50% at 50% 50%);
  position: relative;
}

.recommendation__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: all var(--transition-medium);
}

.recommendation:hover .recommendation__img {
  transform: scale(1.1);
  filter: blur(2px) brightness(80%);
}

.recommendation__caption {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: var(--color-white);
  text-transform: uppercase;
  font-size: 1.6rem;
  font-weight: 600;
  opacity: 0;
  transition: all var(--transition-medium);
}

.recommendation:hover .recommendation__caption {
  opacity: 1;
}

.recommendation__text {
  flex: 1;
}

.recommendation__paragraph {
  font-size: 1.5rem;
  color: var(--color-text-light);
  line-height: 1.8;
}

@media (max-width: 56.25em) {
  .recommendation {
    flex-direction: column;
    text-align: center;
  }
}

/* ============================================
   Contact Section
   ============================================ */
.section-contact {
  background: linear-gradient(to bottom, var(--color-primary-light), var(--color-primary));
  padding: 10rem 0;
}

.contact-form {
  background-color: var(--color-primary-dark);
  padding: 5rem;
  border-radius: var(--border-radius-large);
  box-shadow: var(--shadow-hover);
}

.form__group {
  margin-bottom: 3rem;
  position: relative;
}

.form__input {
  font-size: 1.5rem;
  font-family: inherit;
  padding: 1.5rem 2rem;
  border-radius: var(--border-radius);
  background-color: var(--color-white);
  border: 2px solid transparent;
  width: 100%;
  display: block;
  transition: all var(--transition-medium);
  color: var(--color-text);
}

.form__input--textarea {
  resize: vertical;
  min-height: 15rem;
  font-family: inherit;
}

.form__input:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(221, 224, 189, 0.2);
}

.form__input:focus:invalid {
  border-color: #e74c3c;
}

.form__label {
  font-size: 1.2rem;
  font-weight: 600;
  margin-left: 2rem;
  margin-top: 0.7rem;
  display: block;
  transition: all var(--transition-medium);
  color: var(--color-accent);
  position: absolute;
  top: -2.5rem;
  left: 0;
  opacity: 0;
  visibility: hidden;
}

.form__input:placeholder-shown + .form__label {
  opacity: 0;
  visibility: hidden;
}

.form__input:not(:placeholder-shown) + .form__label,
.form__input:focus + .form__label {
  opacity: 1;
  visibility: visible;
}

/* ============================================
   Footer
   ============================================ */
.footer {
  background-color: var(--color-primary-dark);
  padding: 4rem 0;
  text-align: center;
}

.footer__copyright {
  font-size: 1.4rem;
  color: var(--color-accent);
}

.footer__link {
  color: var(--color-accent-dark);
  text-decoration: none;
  transition: all var(--transition-fast);
}

.footer__link:hover {
  color: var(--color-white);
  text-decoration: underline;
}

/* ============================================
   Modal
   ============================================ */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.9);
  z-index: 20000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-medium);
}

.modal.active {
  opacity: 1;
  visibility: visible;
}

.modal__content {
  position: relative;
  max-width: 90%;
  max-height: 90vh;
  background-color: var(--color-white);
  border-radius: var(--border-radius);
  padding: 2rem;
  box-shadow: var(--shadow-hover);
}

.modal__close {
  position: absolute;
  top: 1rem;
  right: 2rem;
  font-size: 4rem;
  color: var(--color-text);
  background: none;
  border: none;
  cursor: pointer;
  line-height: 1;
  transition: all var(--transition-fast);
  z-index: 10;
}

.modal__close:hover {
  color: var(--color-primary);
  transform: rotate(90deg);
}

.modal__image-container {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.modal__image {
  max-width: 100%;
  max-height: 80vh;
  object-fit: contain;
  border-radius: var(--border-radius);
}

/* ============================================
   Animations
   ============================================ */
@keyframes moveInLeft {
  0% {
    opacity: 0;
    transform: translateX(-10rem);
  }
  80% {
    transform: translateX(1rem);
  }
  100% {
    opacity: 1;
    transform: translate(0);
  }
}

@keyframes moveInRight {
  0% {
    opacity: 0;
    transform: translateX(10rem);
  }
  80% {
    transform: translateX(-1rem);
  }
  100% {
    opacity: 1;
    transform: translate(0);
  }
}

@keyframes fadeInUp {
  0% {
    opacity: 0;
    transform: translateY(3rem);
  }
  100% {
    opacity: 1;
    transform: translate(0);
  }
}

/* ============================================
   Utility Classes
   ============================================ */
.u-center-text {
  text-align: center;
}

.u-margin-bottom-small {
  margin-bottom: 1.5rem;
}

.u-margin-bottom-medium {
  margin-bottom: 4rem;
}

.u-margin-bottom-large {
  margin-bottom: 8rem;
}

/* ============================================
   Responsive Adjustments
   ============================================ */
@media (max-width: 37.5em) {
  .contact-form {
    padding: 3rem 2rem;
  }
  
  .modal__content {
    padding: 1rem;
  }
  
  .modal__close {
    top: 0.5rem;
    right: 1rem;
    font-size: 3rem;
  }
}