/* 
  Modern CSS with OKLCH, Logical Properties, and Cascade Layers
*/

@layer base, components, utilities;

@layer base {
  :root {
    /* Color Palette using OKLCH */
    --bg-color: oklch(0.12 0.02 260);
    --bg-accent: oklch(0.15 0.03 260);
    --text-color: oklch(0.98 0.01 260);
    --text-dim: oklch(0.8 0.01 260);
    --button-bg: oklch(0.6 0.25 260);
    --button-hover: oklch(0.7 0.25 260);
    --accent-glow: oklch(0.6 0.25 260 / 0.4);
    
    /* Effects */
    --shadow-soft: 0 4px 10px rgba(0, 0, 0, 0.3);
    --shadow-deep: 0 20px 50px rgba(0, 0, 0, 0.6);
    --shadow-glow: 0 0 30px var(--accent-glow);
    
    /* Spacing & Sizing */
    --section-gap: 5rem;
    --container-max: 1100px;
    --header-height: 80px;
  }

  body.light-mode {
    --bg-color: oklch(0.98 0.01 260);
    --bg-accent: oklch(0.95 0.02 260);
    --text-color: oklch(0.15 0.02 260);
    --text-dim: oklch(0.4 0.02 260);
    --button-bg: oklch(0.55 0.25 260);
    --button-hover: oklch(0.45 0.25 260);
    --accent-glow: oklch(0.55 0.25 260 / 0.2);
    
    --shadow-soft: 0 4px 10px rgba(0, 0, 0, 0.1);
    --shadow-deep: 0 20px 50px rgba(0, 0, 0, 0.15);
  }

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

  body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    line-height: 1.6;
    min-height: 100vh;
    padding-top: var(--header-height);
    transition: background-color 0.5s ease, color 0.5s ease;
    
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
    background-blend-mode: overlay;
    background-attachment: fixed;
  }

  h1, h2, h3 {
    font-weight: 900;
    letter-spacing: -0.04em;
    line-height: 1.1;
  }

  h1 { font-size: clamp(3rem, 10vw, 5rem); margin-bottom: 1.5rem; text-align: center; }
  h2 { font-size: clamp(2rem, 5vw, 3rem); margin-bottom: 1rem; }
  h3 { font-size: 1.5rem; margin-bottom: 0.5rem; }

  p { margin-bottom: 1.5rem; color: var(--text-dim); }

  a { color: inherit; text-decoration: none; transition: 0.3s; }
}

@layer components {
  /* Header & Nav */
  .site-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    background: var(--bg-color);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    z-index: 1000;
    display: flex;
    justify-content: center;
    box-shadow: var(--shadow-soft);
  }

  .nav-container {
    width: 100%;
    max-width: var(--container-max);
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
  }

  .logo { font-size: 1.5rem; font-weight: 900; letter-spacing: -0.05em; }

  .nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
  }

  .nav-links a:hover { color: var(--button-bg); }

  .auth-controls { display: flex; align-items: center; gap: 1rem; }

  /* Buttons */
  .btn-primary {
    display: inline-block;
    padding: 1rem 2.5rem;
    background: var(--button-bg);
    color: white;
    border-radius: 100px;
    font-weight: 800;
    font-size: 1.1rem;
    border: none;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: var(--shadow-soft);
  }

  .btn-primary:hover {
    background: var(--button-hover);
    transform: translateY(-3px);
    box-shadow: var(--shadow-glow);
  }

  #user-controls {
    display: flex;
    align-items: center;
    gap: 0.75rem;
  }

  #theme-toggle,
  #login-nav-btn,
  #login-nav-btn-inner,
  #show-login-btn,
  #logout-btn {
    min-height: 42px;
    border-radius: 100px;
    cursor: pointer;
    font-weight: 800;
    transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease, border-color 0.2s ease;
  }

  #theme-toggle {
    width: 42px;
    padding: 0;
    border: 1px solid rgba(255, 255, 255, 0.12);
    background: rgba(255, 255, 255, 0.04);
    color: var(--text-color);
  }

  #login-nav-btn,
  #login-nav-btn-inner,
  #show-login-btn {
    position: relative;
    overflow: hidden;
    border: 1px solid oklch(0.78 0.17 260 / 0.45);
    background: linear-gradient(135deg, var(--button-bg), oklch(0.66 0.2 300));
    color: white;
    padding: 0 1.35rem;
    box-shadow: 0 10px 28px var(--accent-glow), inset 0 1px 0 rgba(255, 255, 255, 0.18);
  }

  #login-nav-btn::before,
  #login-nav-btn-inner::before,
  #show-login-btn::before {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(120deg, transparent, rgba(255, 255, 255, 0.22), transparent);
    transform: translateX(-120%);
    transition: transform 0.4s ease;
  }

  #login-nav-btn:hover,
  #login-nav-btn-inner:hover,
  #show-login-btn:hover,
  #login-nav-btn:focus-visible,
  #login-nav-btn-inner:focus-visible,
  #show-login-btn:focus-visible {
    transform: translateY(-2px);
    box-shadow: 0 14px 34px var(--accent-glow), inset 0 1px 0 rgba(255, 255, 255, 0.24);
  }

  #login-nav-btn:hover::before,
  #login-nav-btn-inner:hover::before,
  #show-login-btn:hover::before,
  #login-nav-btn:focus-visible::before,
  #login-nav-btn-inner:focus-visible::before,
  #show-login-btn:focus-visible::before {
    transform: translateX(120%);
  }

  #logout-btn {
    border: 1px solid rgba(255, 255, 255, 0.12);
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-color);
    padding: 0 1.1rem;
  }

  #auth-reminder {
    max-width: 520px;
    text-align: center;
  }

  #auth-reminder p {
    margin-bottom: 1rem;
  }

  #show-login-btn {
    min-width: 180px;
    padding: 0 1.5rem;
  }

  #theme-toggle:hover,
  #theme-toggle:focus-visible,
  #logout-btn:hover,
  #logout-btn:focus-visible {
    transform: translateY(-2px);
    border-color: var(--button-bg);
    box-shadow: var(--shadow-glow);
  }

  .user-email {
    max-width: 140px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    color: var(--text-dim);
    font-weight: 800;
  }

  body.light-mode #theme-toggle,
  body.light-mode #logout-btn {
    border-color: rgba(0, 0, 0, 0.12);
    background: rgba(0, 0, 0, 0.03);
  }

  /* Sections */
  .content-section {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: var(--section-gap) 2rem;
    display: flex;
    flex-direction: column;
    align-items: center;
  }

  .section-header { text-align: center; max-width: 700px; margin-bottom: 3rem; }

  /* Hero */
  #hero { padding: 8rem 2rem 5rem; text-align: center; }
  .hero-subtitle { font-size: 1.3rem; max-width: 800px; margin: 0 auto 2.5rem; }

  /* Grids & Cards */
  .types-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2.5rem;
    width: 100%;
  }

  .type-card {
    background: var(--bg-accent);
    padding: 3rem;
    border-radius: 40px;
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: 0.4s;
    box-shadow: var(--shadow-soft);
  }

  .type-card:hover { transform: translateY(-10px); box-shadow: var(--shadow-deep); border-color: var(--button-bg); }

  .type-icon { font-size: 4rem; margin-bottom: 1.5rem; }

  .partnership-form {
    width: 100%;
    max-width: 720px;
    background: var(--bg-accent);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 28px;
    padding: 2rem;
    box-shadow: var(--shadow-soft);
  }

  .form-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1rem;
  }

  .partnership-form label {
    display: block;
    margin-bottom: 1rem;
  }

  .partnership-form span {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 800;
  }

  .partnership-form input,
  .partnership-form textarea {
    width: 100%;
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 16px;
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-color);
    font: inherit;
    padding: 0.95rem 1rem;
    outline: none;
    transition: border-color 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
  }

  .partnership-form textarea {
    min-height: 150px;
    resize: vertical;
  }

  .partnership-form input:focus,
  .partnership-form textarea:focus {
    border-color: var(--button-bg);
    background: rgba(255, 255, 255, 0.08);
    box-shadow: 0 0 0 4px var(--accent-glow);
  }

  .partnership-form .btn-primary {
    margin-top: 0.5rem;
  }

  body.light-mode .partnership-form {
    border-color: rgba(0, 0, 0, 0.08);
  }

  body.light-mode .partnership-form input,
  body.light-mode .partnership-form textarea {
    border-color: rgba(0, 0, 0, 0.12);
    background: rgba(0, 0, 0, 0.03);
  }

  .traits-list {
    list-style: none;
    margin-top: 1.5rem;
  }

  .traits-list li::before {
    content: "✓";
    margin-right: 0.5rem;
    color: var(--button-bg);
    font-weight: 900;
  }

  /* Modals */
  .modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(10px);
    justify-content: center;
    align-items: center;
  }

  .modal-content {
    background: var(--bg-color);
    padding: 3rem;
    border-radius: 30px;
    width: 90%;
    max-width: 450px;
    position: relative;
    box-shadow: var(--shadow-deep);
  }

  .close-btn {
    position: absolute;
    top: 1.5rem;
    right: 1.5rem;
    font-size: 2rem;
    cursor: pointer;
    opacity: 0.5;
  }

  #auth-container h2 {
    margin-bottom: 1.5rem;
    text-align: center;
  }

  .auth-tabs {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.35rem;
    margin-bottom: 1.5rem;
    padding: 0.35rem;
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 100px;
    background: rgba(255, 255, 255, 0.04);
  }

  .auth-tabs button {
    min-height: 42px;
    border: 0;
    border-radius: 100px;
    background: transparent;
    color: var(--text-dim);
    cursor: pointer;
    font: inherit;
    font-weight: 900;
    transition: color 0.2s ease, background 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
  }

  .auth-tabs button:hover,
  .auth-tabs button:focus-visible {
    color: var(--text-color);
    transform: translateY(-1px);
  }

  .auth-tabs button.active {
    color: white;
    background: linear-gradient(135deg, var(--button-bg), oklch(0.66 0.2 300));
    box-shadow: 0 8px 22px var(--accent-glow), inset 0 1px 0 rgba(255, 255, 255, 0.18);
  }

  #login-form,
  #signup-form {
    width: 100%;
  }

  #login-form input,
  #signup-form input {
    width: 100%;
    min-height: 48px;
    margin-bottom: 0.9rem;
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 16px;
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-color);
    font: inherit;
    padding: 0 1rem;
    outline: none;
    transition: border-color 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
  }

  #login-form input:focus,
  #signup-form input:focus {
    border-color: var(--button-bg);
    background: rgba(255, 255, 255, 0.08);
    box-shadow: 0 0 0 4px var(--accent-glow);
  }

  #login-form .btn-primary,
  #signup-form .btn-primary {
    width: 100%;
    margin-top: 0.3rem;
  }

  body.light-mode .auth-tabs {
    border-color: rgba(0, 0, 0, 0.08);
    background: rgba(0, 0, 0, 0.03);
  }

  body.light-mode #login-form input,
  body.light-mode #signup-form input {
    border-color: rgba(0, 0, 0, 0.12);
    background: rgba(0, 0, 0, 0.03);
  }

  /* Footer */
  .site-footer {
    background: var(--bg-accent);
    padding: 5rem 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    margin-top: 5rem;
  }

  .footer-content {
    max-width: var(--container-max);
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 3rem;
  }

  .footer-links { display: flex; gap: 4rem; }
  .link-group h4 { margin-bottom: 1.5rem; text-transform: uppercase; font-size: 0.8rem; letter-spacing: 0.1em; }
  .link-group a { display: block; margin-bottom: 0.8rem; color: var(--text-dim); }
  .link-group a:hover { color: var(--button-bg); }
}

@layer utilities {
  .card {
    background: var(--bg-accent);
    padding: 2rem;
    border-radius: 20px;
    width: 100%;
  }

  #test-wrapper {
    width: 100%;
    display: flex;
    justify-content: center;
    padding: 2rem;
    background: rgba(255, 255, 255, 0.02);
    border-radius: 50px;
    border: 1px dashed rgba(255, 255, 255, 0.1);
  }
}

@media (max-width: 768px) {
  .nav-links { display: none; }
  .footer-content { flex-direction: column; text-align: center; }
  .footer-links { justify-content: center; }
  .form-grid { grid-template-columns: 1fr; }
  .partnership-form { padding: 1.5rem; }
}