/* Styling chính cho layout: navbar, hero, projects, footer, responsive... */

@import url(https://fonts.googleapis.com/css?family=Raleway:100,200,300,regular,500,600,700,800,900,100italic,200italic,300italic,italic,500italic,600italic,700italic,800italic,900italic);

/* ==================== CSS VARIABLES ==================== */
:root {
  /* Colors */
  --primary-color: #ffcd42;
  --secondary-color: #ffd35c;
  
  --bg-primary: #ffffff;
  --bg-secondary: #000000;
  --bg-secondary-two: #111111;
  
  --text-color: #222222;
  --text-color-two: #ffffff;
  
  --card-background: #f4f4f4;

  /* --- CÁC BIẾN MỚI --- */
  --header-border: #e0e0e0;
  --transition-speed: 0.3s;
  --transition-timing: ease-in-out;
  --shadow: 0 10px 40px rgba(0, 0, 0, 0.2);

  /* Font Weight & Size */
  --weight-small: 400;
  --weight-semibold: 600;
  --weight-bold: 800;
  --width-small: 600px;
  --width-medium: 1100px;
  --width-large: 1300px;

  --sync-speed: 0.25s; /* 0.25s là tốc độ lý tưởng cho mắt */
  --sync-easing: cubic-bezier(0.4, 0, 0.2, 1);
}

/* ==================== DARK MODE OVERRIDES ==================== */
[data-theme="dark"] {
  --bg-primary: #000000;
  --bg-secondary: #ffffff; 
  --text-color: #ffffff;
  --text-color-two: #000000;
  --card-background: #333333;
  --header-border: #333333;
  --shadow: none; 
}

/* ==================== GLOBAL RESET & BASE ==================== */
html {
  font-size: 100%;
  scroll-behavior: smooth;
}

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

ul {
  list-style: none;
}

a {
  text-decoration: none;
  color: var(--text-color);
  /* ĐÃ XÓA TRANSITION Ở ĐÂY ĐỂ TRÁNH XUNG ĐỘT */
  transition: transform var(--transition-speed) var(--transition-timing),
              background-color var(--transition-speed) var(--transition-timing),
              border-color var(--transition-speed) var(--transition-timing);
}

a:hover {
  opacity: 0.8;
}

body {
  background: var(--bg-primary);
  color: var(--text-color);
  font-family: "Raleway", sans-serif;
  line-height: 1.5;
  /* ĐÃ XÓA TRANSITION Ở ĐÂY ĐỂ TAILWIND LO */
  transition: background-color var(--transition-speed) var(--transition-timing), 
              color var(--transition-speed) var(--transition-timing);
}

/* ==================== NAVBAR ==================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 20;
  background: var(--bg-primary);
  border-bottom: 1px solid var(--header-border);
  /* ĐÃ XÓA TRANSITION Ở ĐÂY */
  transition: transform var(--transition-speed) var(--transition-timing),
              background-color var(--transition-speed) var(--transition-timing),
              border-color var(--transition-speed) var(--transition-timing);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  z-index: 20;
  height: 80px;
  width: 100%;
}

.navbar .nav-menu {
  display: flex;
  align-items: center;
  background: transparent;
}

.navbar .nav-link {
  margin: 0 1rem;
  font-size: 0.8rem;
  font-weight: var(--weight-semibold);
  cursor: pointer;
  color: var(--text-color);
}

.navbar .nav-menu .theme-switch {
  margin: 0 1rem;
  display: flex;
  align-items: center;
}

/* LOGO */
/* Trạng thái mặc định (Light Mode) */
.navbar #logo img {
  display: block;
  width: 100px;
  filter: invert(0); /* Khai báo rõ trạng thái gốc */
  transition: all var(--transition-speed) var(--transition-timing) !important;
  will-change: filter;
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
}

/* Khi có class này, Navbar sẽ trượt lên trên (-100% chiều cao của nó) */
.navbar-hidden {
  transform: translateY(-100%);
  z-index: 100 !important;
}

[data-theme="dark"] .navbar #logo img {
  filter: invert(1) !important;
}

.navbar .btn {
  margin-right: 1.5rem;
}

.fas.fa-arrow-right {
  margin-left: 0.5rem;
  font-size: 0.9rem;
}

/* Hamburger */
.hamburger {
  margin-bottom: 0.1rem;
  display: none;
}

.bar {
  display: block;
  width: 23px;
  height: 3px;
  margin: 4px auto;
  border-radius: 30px;
  background-color: var(--text-color);
  /* ĐÃ XÓA TRANSITION */
  transition: transform var(--transition-speed) var(--transition-timing),
              background-color var(--transition-speed) var(--transition-timing),
              border-color var(--transition-speed) var(--transition-timing);
}

/* ==================== HERO SECTION ==================== */
#hero {
  display: flex;
  flex-direction: column;
  height: 100%;
}

.profile-image {
  width: 100%;
  height: auto;
  border-radius: 50%;
  animation: bounce 1s infinite alternate;
}

@keyframes bounce {
  from { transform: translateY(0px); }
  to { transform: translateY(-4px); }
}

@keyframes arrowBounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(3px); }
}

#scroll-to-projects:hover {
  opacity: 0.8;
}

#scroll-to-projects i {
  animation: arrowBounce 1.2s ease-in-out infinite;
}

/* ==================== PROJECTS GRID ==================== */
#projects {
  display: flex;
  flex-direction: column;
  margin: 2rem auto 5rem;
}

#projects .btn {
  align-self: center;
  margin: 2rem 0;
}

.project {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-auto-rows: minmax(250px, auto);
  grid-gap: 0.9rem;
}

.card .project-bio p {
  font-size: 0.83rem;
}

.card .project-bio h3 {
  font-size: 0.9rem;
}

.project-info {
  display: flex;
  justify-content: space-between;
  opacity: 0;
  position: relative;
  transition: 0.5s ease-in-out; /* Cái này là hover effect nên giữ lại */
}

.project-bio {
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  position: relative;
  top: 160px;
  left: 10px;
}

/* ==================== FOOTER ==================== */
#footer {
  background-color: #ffffff;
  color: #1a1a1a;
  padding: 10px 0;
  border: none;
  border-top: 1px solid #dddddd; 
  padding-top: 10px;
  margin-top: 120px; 
  /* ĐÃ XÓA TRANSITION */
  transition: transform var(--transition-speed) var(--transition-timing),
              background-color var(--transition-speed) var(--transition-timing),
              border-color var(--transition-speed) var(--transition-timing);
}

.dark #footer,
[data-theme="dark"] #footer {
  background-color: #000000 !important;
  color: #ffffff !important;
  border-top: 1px solid #333333;
}

#footer .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
  max-width: 1024px; 
  margin: 0 auto;
  padding: 0 20px; 
  flex-wrap: nowrap; 
}

#footer a {
  font-size: 0.85rem;
  color: inherit;
  text-decoration: none;
}

#footer p {
  font-size: 0.75rem;
  color: #666;
}

.dark #footer p,
[data-theme="dark"] #footer p {
  color: #aaa;
}

.dark #footer .social img,
[data-theme="dark"] #footer .social img {
  filter: invert(1);
}

#footer .social {
  display: flex;
  gap: 15px;
}

#footer .social img {
  width: 20px;
  height: 20px;
  transition: filter var(--transition-speed) var(--transition-timing);
}

/* ==================== RESPONSIVE ==================== */
@media (max-width: 1000px) {
  .project {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 670px) {
  .navbar .nav-menu {
    position: fixed;
    right: -100vw;
    top: 4.5rem;
    flex-direction: column;
    width: calc(80% - 10px);
    transition: right 0.3s ease-in-out, /* Giữ hiệu ứng trượt ra vào */
                background-color var(--transition-speed) var(--transition-timing),
                border-color var(--transition-speed) var(--transition-timing);
    box-shadow: var(--shadow);
    padding: 2rem;
    border-radius: 5px;
    align-items: flex-start;
    background: var(--bg-primary); 
    border: 1px solid var(--header-border);
  }

  .navbar .btn {
    margin: 0;
    margin-top: 1rem;
  }

  .nav-menu.active {
    right: 20px;
  }

  .nav-menu .nav-link {
    font-size: 0.9rem;
    margin: 0 0.2rem;
  }

  .nav-menu li {
    margin-bottom: 0.5rem;
    width: 100%;
  }

  .nav-menu .btn {
    width: 100%;
    text-align: center;
    margin-top: 0.5rem;
  }

  .hamburger {
    display: block;
    cursor: pointer;
    padding: 0.2rem 0.4rem;
  }

  .hamburger.active {
    border: 1px dotted gray;
  }

  .hamburger.active .bar:nth-child(2) {
    opacity: 0;
  }

  .hamburger.active .bar:nth-child(1) {
    transform: translateY(6px) rotate(45deg);
  }

  .hamburger.active .bar:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
  }
}

@media (max-width: 600px) {
  .project {
    display: grid;
    grid-template-columns: 1fr;
  }

  .header-container .btn {
    border-radius: 5px;
    width: 80%;
  }
}

/* ==================== NAVBAR LINKS ==================== */
.nav-link {
  position: relative;
  margin: 0 1rem;
  padding: 5px 0;
  font-weight: var(--weight-semibold);
  text-decoration: none;
  color: var(--text-color);
  /* ĐÃ XÓA TRANSITION */
  transition: transform var(--transition-speed) var(--transition-timing),
              background-color var(--transition-speed) var(--transition-timing),
              border-color var(--transition-speed) var(--transition-timing);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  height: 2px;
  left: 50%;
  transform: translateX(-50%);
  width: 0%;
  background-color: var(--text-color);
  transition: width 0.3s ease-in-out; /* Giữ lại animation hover gạch chân */
}

.nav-link:hover {
  text-shadow: 0 0 1px currentColor; 
  opacity: 1;
}

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

.nav-link.active {
  text-shadow: 0 0 1px currentColor;
}

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

@keyframes bounce-slow {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(2px); }
}

.animate-bounce-slow {
  display: inline-block;
  animation: bounce-slow 1.5s ease-in-out infinite;
  opacity: 0.8; 
}

/* ==================== SWITCH & ICON ==================== */
.theme-switch-item {
  display: flex;
  align-items: center; 
  height: 100%; 
}

.theme-toggle-btn.nav-link {
  cursor: pointer;
  display: flex;
  align-items: center; 
  justify-content: center;
  position: relative;
  color: var(--text-color); 
  height: 1.5em; 
  margin: 0 1rem;
  padding: 5px 0; 
  overflow: visible; 
}

.theme-toggle-btn input {
  display: none;
}

.icon-wrapper {
  position: relative;
  width: 24px; 
  height: 24px; 
  overflow: hidden; 
  display: flex;
  align-items: center;
  justify-content: center;
  padding-bottom: 0px; 
  margin-bottom: -4px; 
  box-sizing: content-box;
}

.icon-wrapper svg {
  position: absolute;
  width: 100%;
  height: 100%;
  /* TRANSITION ICON RIÊNG BIỆT - KHÔNG ẢNH HƯỞNG ĐẾN MÀU */
  transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.moon-icon {
  opacity: 0;
  transform: translateY(-20px) rotate(-30deg);
}
.sun-icon {
  opacity: 1;
  transform: translateY(0);
}

/* Hover Effect */
.theme-toggle-btn:hover .sun-icon {
  transform: translateY(10px); 
}
.theme-toggle-btn:hover::after {
  width: 100%; 
}

/* Dark Mode Logic */
.theme-toggle-btn input:checked ~ .icon-wrapper .sun-icon {
  opacity: 0;
  transform: translateY(20px) rotate(90deg);
}

.theme-toggle-btn input:checked ~ .icon-wrapper .moon-icon {
  opacity: 1;
  transform: translateY(0) rotate(0);
}

.theme-toggle-btn:hover input:checked ~ .icon-wrapper .moon-icon {
  transform: translateY(10px);
}

.theme-toggle-btn.nav-link::after {
  bottom: -6px !important; 
  height: 2px !important; 
}

#content-preview .group .absolute {
  transition: background-color var(--transition-speed) var(--transition-timing), 
              border-color var(--transition-speed) var(--transition-timing);
}