@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;600;800&display=swap');

/* =========================================
   1. DYNAMIC THEME VARIABLES
   ========================================= */

/* Default Dark Theme */
:root {
    --bg-color: #060e23;
    --card-bg: #172033;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --accent: #bde90e;
    --accent-gradient: linear-gradient(135deg, #0ea5e9, #8b5cf6);
    --card-border: rgb(9, 54, 65);
    --nav-bg: rgba(11, 17, 32, 0.9);
    --header-bg: rgba(11, 17, 32, 0.9);
    --input-bg: rgba(15, 23, 42, 0.5);
    --shadow-glow: 0 8px 32px rgba(0, 210, 255, 0.15);
}

/* Light Theme Overrides */
body.light-theme {
    --bg-color: #11420827; 
    --card-bg: #ffffff65; 
    --text-main: #0f172a; 
    --text-muted: #64748b; 
    --accent: #0a87c6; /* Darker blue for better visibility on white */
    --accent-gradient: linear-gradient(135deg, #0284c7, #6d28d9);
    --card-border: rgba(0, 0, 0, 0.314);
    --nav-bg: rgba(23, 126, 230, 0.95);
    --header-bg: rgba(23, 126, 230, 0.95);
    --input-bg: rgba(255, 255, 255, 0.8);
    --shadow-glow: 0 8px 32px rgba(0, 100, 200, 0.15);
}

/* =========================================
   2. GLOBAL STYLES (Applying the themes)
   ========================================= */

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    font-family: 'Inter', sans-serif;
    margin: 0;
    padding: 0;
    /* Smooth transition for theme switching */
    transition: background-color 0.4s ease, color 0.4s ease; 
}

/* Ensure your header uses the dynamic nav background */
.header {
    background-color: var(--nav-bg);
    border-bottom: 1px solid var(--card-border);
    transition: background-color 0.4s ease, border-color 0.4s ease;
}

/* Ensure all cards use the dynamic card background */
.card {
    background-color: var(--card-bg);
    border: 1px solid var(--card-border);
    transition: background-color 0.4s ease, border-color 0.4s ease;
}

/* Update inputs for light mode contrast */
input, select {
    background-color: transparent;
    border: 1px solid var(--card-border);
    color: var(--text-main);
}
body.light-theme input, body.light-theme select {
    background-color: rgba(0,0,0,0.02);
}

/* ================= HEADER (Glass) ================= */
.header {
  background: var(--header-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  padding: 15px 30px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--card-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header h2 {
  margin: 0;
  font-size: 1.4rem;
  font-weight: 800;
  letter-spacing: 1px;
  background: var(--accent-gradient);
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.nav-links a {
  color: var(--text-main);
  margin-left: 20px;
  text-decoration: none;
  font-weight: 600;
  transition: color 0.3s;
}

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

/* Theme Toggle Button */
#theme-toggle {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  color: var(--text-main);
  padding: 8px 16px;
  border-radius: 20px;
  cursor: pointer;
  margin-left: 20px;
  font-weight: 600;
  transition: all 0.3s ease;
}
#theme-toggle:hover {
  transform: scale(1.05);
  box-shadow: var(--shadow-glow);
}

/* ================= CONTAINERS & CARDS ================= */
.container { max-width: 800px; margin: 50px auto; padding: 20px; }

.card {
  background: var(--card-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  padding: 40px;
  border-radius: 16px;
  border: 1px solid var(--card-border);
  box-shadow: var(--shadow-glow);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 15px 35px rgba(0, 210, 255, 0.2);
}

/* ================= FORM ELEMENTS ================= */
label {
  display: block;
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text-muted);
}

input {
  width: 100%;
  padding: 12px 15px;
  margin-bottom: 20px;
  border-radius: 8px;
  border: 1px solid var(--card-border);
  background: var(--input-bg);
  color: var(--text-main);
  box-sizing: border-box;
  font-family: 'Inter', sans-serif;
  transition: all 0.3s ease;
}

input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 10px rgba(14, 165, 233, 0.3);
  transform: translateY(-2px);
}

/* ================= BUTTONS ================= */
button[type="submit"], .btn {
  width: 100%;
  padding: 14px;
  background: var(--accent-gradient);
  color: white;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  font-size: 1rem;
  font-weight: 800;
  letter-spacing: 0.5px;
  transition: all 0.3s ease;
  box-shadow: 0 4px 15px rgba(0, 165, 233, 0.4);
}

button[type="submit"]:hover, .btn:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 8px 25px rgba(0, 165, 233, 0.6);
}

/* ================= ANIMATIONS ================= */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease-out, transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal.active {
  opacity: 1;
  transform: translateY(0);
}

/* ================= ALERTS ================= */
.flash {
  padding: 15px; margin-bottom: 25px; border-radius: 8px;
  text-align: center; font-weight: 600; animation: slideDown 0.5s ease;
}
.flash.error { background: rgba(239, 68, 68, 0.1); border: 1px solid #ef4444; color: #ef4444; }
.flash.success { background: rgba(34, 197, 94, 0.1); border: 1px solid #22c55e; color: #22c55e; }

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-20px); }
  to { opacity: 1; transform: translateY(0); }
}