@import 'variables.css';
@import 'reset.css';
@import 'recommended.css';
@import 'slider.css';
@import 'progress.css';
@import 'timer.css';

body {
  background-color: var(--color-bg);
  color: var(--color-text-primary);
  font-family: var(--font-family-base);
  display: flex;
  flex-direction: column;
}

/* Layout */
.container {
  max-width: 1000px;
  margin: 0 auto;
  padding: 0 1.5rem;
  width: 100%;
}

header {
  border-bottom: 1px solid var(--color-border);
  padding: 1.5rem 0;
  margin-bottom: 2rem;
  position: relative;
}

header::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, 
    var(--color-accent-green) 0%,
    var(--color-accent-white) 20%,
    var(--color-accent-red) 40%, 
    var(--color-accent-yellow) 60%,
    var(--color-accent-orange) 80%,
    var(--color-accent-blue) 100%
  );
  z-index: 10;
}

header nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.site-title {
  font-size: 1.5rem;
  font-weight: 700;
  text-decoration: none;
  color: var(--color-text-primary);
}

footer {
  margin-top: auto;
  padding: 2rem 0;
  text-align: center;
  color: var(--color-text-secondary);
  border-top: 1px solid var(--color-border);
}

/* Buttons */
.nav-link {
  text-decoration: none;
  color: var(--color-text-secondary);
  font-weight: 600;
  margin-right: 1.5rem;
  transition: color 0.2s;
}

.nav-link:hover {
  color: var(--color-text-primary);
}

/* Subtle Cube Colors for Navigation */
.nav-links .nav-link:nth-child(1):hover { color: var(--color-accent-white); }  /* Home */
.nav-links .nav-link:nth-child(2):hover { color: var(--color-accent-green); }  /* Tutorials */
.nav-links .nav-link:nth-child(3):hover { color: var(--color-accent-red); }    /* Advanced */
.nav-links .nav-link:nth-child(4):hover { color: var(--color-accent-blue); }   /* Algorithms */
.nav-links .nav-link:nth-child(5):hover { color: var(--color-accent-yellow); } /* Search */

.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  border-radius: 4px;
  text-decoration: none;
  font-weight: 600;
  transition: transform 0.2s ease, background-color 0.2s;
  border: 1px solid var(--color-text-primary);
  color: var(--color-text-primary);
  margin-right: 0.5rem;
  margin-bottom: 0.5rem;
}

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

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

.btn-primary:hover {
  background-color: var(--color-accent-white);
  color: var(--color-bg);
}

/* Typography */
h1, h2, h3 {
  margin-bottom: 1rem;
  line-height: 1.2;
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; margin-top: 2rem; }
h3 { font-size: 1.5rem; margin-top: 1.5rem; }

p {
  margin-bottom: 1.5rem;
}

a {
  color: var(--color-accent-blue);
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}

/* Tutorial Cards (Grid) */
.tutorial-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.tutorial-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 1.5rem;
  transition: transform 0.2s, border-color 0.2s;
  display: flex;
  flex-direction: column;
}

.tutorial-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-text-primary);
}

.tutorial-card h3 {
  margin-top: 0;
  font-size: 1.25rem;
}

.tutorial-card a {
  text-decoration: none;
  color: inherit;
}

.tag {
  display: inline-block;
  font-size: 0.75rem;
  padding: 0.25rem 0.6rem;
  border-radius: 50px;
  background-color: var(--color-border);
  color: var(--color-text-secondary);
  margin-bottom: 0.5rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Card Difficulty Borders */
.tutorial-card.difficulty-beginner { 
  border-left: 4px solid var(--color-accent-green); 
}
.tutorial-card.difficulty-novice { 
  border-left: 4px solid var(--color-accent-blue); 
}
.tutorial-card.difficulty-medium,
.tutorial-card.difficulty-intermediate { 
  border-left: 4px solid var(--color-accent-orange); 
}
.tutorial-card.difficulty-hard, 
.tutorial-card.difficulty-advanced { 
  border-left: 4px solid var(--color-accent-red); 
}

/* Video Embed Wrapper */
.video-wrapper {
  position: relative;
  padding-bottom: 56.25%; /* 16:9 */
  padding-top: 25px;
  height: 0;
  margin-top: 2rem;
  margin-bottom: 2rem;
  background-color: #000;
  border-radius: 8px;
  overflow: hidden;
}

.video-wrapper iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

/* Authentication Forms */
.auth-container {
  max-width: 400px;
  margin: 4rem auto;
  padding: 2rem;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 8px;
}

.auth-form {
  margin-top: 2rem;
}

.form-group {
  margin-bottom: 1.5rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 600;
  color: var(--color-text-secondary);
}

.form-group input {
  width: 100%;
  padding: 0.75rem;
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  color: var(--color-text-primary);
  border-radius: 4px;
}

.form-group input:focus {
  outline: none;
  border-color: var(--color-accent-blue);
}

.btn-block {
  display: block;
  width: 100%;
  text-align: center;
  cursor: pointer;
}

.btn-block:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* Password Requirements List */
.password-requirements {
  margin-top: 1rem;
  font-size: 0.85rem;
  padding: 1rem;
  background-color: var(--color-bg);
  border-radius: 4px;
}

.req-title {
  margin-bottom: 0.5rem;
  font-weight: 600;
}

.password-requirements ul {
  list-style: none;
  padding-left: 0;
}

.password-requirements li {
  margin-bottom: 0.25rem;
  color: var(--color-text-secondary);
  display: flex;
  align-items: center;
}

.password-requirements li::before {
  content: "○";
  margin-right: 0.5rem;
  font-weight: bold;
}

.password-requirements li.valid {
  color: var(--color-accent-green);
}
.password-requirements li.valid::before {
  content: "✓";
}

.password-requirements li.invalid {
  color: var(--color-text-secondary); /* or light red if prefered */
}

.auth-footer {
  margin-top: 1.5rem;
  text-align: center;
  font-size: 0.9rem;
  color: var(--color-text-secondary);
}