/* =============== Global Variables & Color Schemes =============== */
:root {
  /* Light Mode (Default) */
  --bg-gradient-start: #e0c3fc;
  --bg-gradient-end: #8ec5fc;
  --card-bg: rgba(255, 255, 255, 0.6);
  --text-color: #1a202c;
  --header-bg: rgba(255, 255, 255, 0.4);
  --border-color: rgba(0, 0, 0, 0.1);
  --accent-color: #8B5CF6; /* Vibrant Purple */
  --accent-hover: #7C3AED;
  --accent-glow: rgba(139, 92, 246, 0.5);
  --nav-button-border: #d1d5db;
  --label-color: #4a5568;
}

body.dark-mode {
  /* Dark Mode */
  --bg-gradient-start: #232526;
  --bg-gradient-end: #414345;
  --card-bg: rgba(17, 24, 39, 0.5);
  --text-color: #f7fafc;
  --header-bg: rgba(17, 24, 39, 0.4);
  --border-color: rgba(255, 255, 255, 0.2);
  --accent-color: #0891B2; /* Vibrant Teal */
  --accent-hover: #06B6D4;
  --accent-glow: rgba(8, 145, 178, 0.5);
  --nav-button-border: #4b5563;
  --label-color: #9ca3af;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  transition: background-color 0.4s ease, color 0.4s ease, border-color 0.4s ease;
}

/* =============== Animated Gradient Background =============== */
body {
  background: linear-gradient(-45deg, var(--bg-gradient-start), var(--bg-gradient-end), #e0c3fc, #8ec5fc);
  background-size: 400% 400%;
  animation: gradient 20s ease infinite;
  color: var(--text-color);
  line-height: 1.6;
  padding: 1rem;
  min-height: 100vh;
}

@keyframes gradient {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

/* =============== Loader =============== */
.loader {
  position: fixed; top: 0; left: 0; width: 100%; height: 100%;
  background-color: #111827; display: flex; justify-content: center;
  align-items: center; z-index: 9999;
}
.loader-spinner {
  border: 5px solid rgba(128, 128, 128, 0.3); border-top-color: var(--accent-color);
  border-radius: 50%; width: 50px; height: 50px; animation: spin 1s linear infinite;
}
@keyframes spin { 0% { transform: rotate(0deg); } 100% { transform: rotate(360deg); } }


/* =============== Typography =============== */
.typewriter {
  font-family: 'Playfair Display', serif;
  text-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

/* =============== Header & Navigation (Glassmorphism) =============== */
header {
  position: sticky; top: 1rem; z-index: 1000;
  background: var(--header-bg); backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px); border: 1px solid var(--border-color);
  color: var(--text-color); padding: 1rem 2rem; display: flex;
  justify-content: space-between; align-items: center;
  border-radius: var(--border-radius);
  animation: slideDown 1s cubic-bezier(0.165, 0.84, 0.44, 1) forwards;
}
@keyframes slideDown { from { transform: translateY(-120%); } to { transform: translateY(0); } }

.navbar-buttons { display: flex; gap: 1rem; align-items: center; }

.nav-button {
  background-color: transparent; border: 1px solid var(--nav-button-border);
  color: var(--text-color); font-size: 1rem; padding: 0.5rem 1rem;
  border-radius: 9999px; cursor: pointer; transition: all 0.3s ease;
}
.nav-button:hover {
  background-color: var(--accent-color); color: white;
  border-color: var(--accent-color); transform: translateY(-2px);
}

/* =============== Main Content =============== */
main {
  max-width: 800px; margin: 2rem auto; background-color: var(--card-bg);
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  border-radius: var(--border-radius); padding: 2rem;
  border: 1px solid var(--border-color);
  animation: fadeInUp 1s cubic-bezier(0.165, 0.84, 0.44, 1) 0.2s forwards;
  opacity: 0;
}
@keyframes fadeInUp { from { opacity: 0; transform: translateY(30px); } to { opacity: 1; transform: translateY(0); } }

.title {
  font-family: 'Playfair Display', serif; font-size: 2.2rem;
  font-weight: 700; color: var(--text-color); margin-bottom: 1rem;
}

.description { color: var(--label-color); margin-bottom: 1.5rem; }

/* =============== Forms (FIXED) =============== */
.form-group { position: relative; margin: 1.5rem 0; }

input[type="text"], input[type="file"] {
  width: 100%; padding: 1rem; background: transparent;
  border: 1px solid var(--border-color); border-radius: var(--border-radius);
  transition: all 0.3s ease; color: var(--text-color); font-size: 1rem;
}
input:focus {
  outline: none; border-color: var(--accent-color);
  box-shadow: 0 0 0 3px var(--accent-glow);
}
label {
  position: absolute; left: 1rem; top: 1rem; color: var(--label-color);
  transition: all 0.3s ease; pointer-events: none; font-weight: 600;
  background-color: var(--card-bg); padding: 0 0.2rem;
}
input:focus + label, input:not([value=""]) + label {
  top: -0.6rem; left: 0.8rem; font-size: 0.8rem;
  color: var(--accent-color); border-radius: 5px;
}
input[type="file"] { color: var(--label-color); }
input[type="file"]::-webkit-file-upload-button { visibility: hidden; }
input[type="file"]::before {
    content: 'Choose File'; display: inline-block;
    background: var(--accent-color); color: white;
    padding: 0.5rem 1rem; border-radius: 5px; cursor: pointer;
    margin-right: 1rem;
}
input[type="file"]:hover::before { background: var(--accent-hover); }

/* =============== Buttons with Glow/Push Effect =============== */
.btn {
  background-color: var(--accent-color); color: white;
  padding: 0.75rem 1.5rem; border: none; border-radius: 9999px;
  font-weight: 600; cursor: pointer; transition: all 0.2s ease;
}
.btn:hover {
  background-color: var(--accent-hover); transform: translateY(-3px) scale(1.05);
  box-shadow: 0 10px 20px -5px var(--accent-glow);
}
.btn:active {
    transform: translateY(-1px) scale(1.0);
    box-shadow: 0 5px 10px -5px var(--accent-glow);
}

/* =============== Theme Switcher =============== */
.theme-switcher {
    font-size: 1.5rem; background: none; border: none;
    cursor: pointer; color: var(--text-color); padding: 0.5rem;
    display: flex; align-items: center; justify-content: center;
    transition: transform 0.3s ease;
}
.theme-switcher:hover { transform: scale(1.2) rotate(15deg); }