/*
===========================================================
File: styles.css
Author: Zayaan Bhanwadia
Created: 2026
Description:
  - Defines root variables, typography, colors, and layout.
  - Styles navbar, hero section, banners, cards, grids, timeline, gallery, and footer.
  - Includes responsive rules for mobile devices.
  - Implements cursor mist, fluid drop, and futuristic image hover effects.
  - REFINED: Added Glassmorphism, Bento Grid, Light Mode & Detailed Footer.
===========================================================
*/

/* ============================
   Root variables & base reset
============================ */
:root {
  --bg: #0d0f14; /* Refined Dark Mode 2.0 Depth */
  --bg-secondary: #161a23;
  --text: #f0f2f5;
  --muted: #94a3b8;
  --accent: #6366f1; /* Modern Indigo */
  --accent-soft: rgba(99, 102, 241, 0.15);
  --accent-glow: rgba(99, 102, 241, 0.3);
  
  /* Glassmorphism Additions */
  --card-glass: rgba(255, 255, 255, 0.03);
  --border-glass: rgba(255, 255, 255, 0.08);
  --card: var(--card-glass); /* Replaces solid card color */
  --border: var(--border-glass); /* Replaces solid border color */
}

/* --- ADDED: Light Mode Overrides --- */
:root.light-mode {
  --bg: #f8fafc;
  --bg-secondary: #ffffff;
  --text: #0f172a;
  --muted: #64748b;
  --accent: #4f46e5;
  --accent-soft: rgba(79, 70, 229, 0.1);
  --accent-glow: rgba(79, 70, 229, 0.2);
  --card-glass: rgba(0, 0, 0, 0.02);
  --border-glass: rgba(0, 0, 0, 0.05);
  --card: #ffffff;
  --border: rgba(0, 0, 0, 0.1);
}

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

html, body { height: 100%; }

/* ============================
   Global layout & background
============================ */
body {
  font-family: 'Inter', system-ui;
  background-color: var(--bg);
  background-image:
    radial-gradient(1200px 600px at 10% -10%, rgba(99, 102, 241, 0.05), transparent 40%),
    radial-gradient(1000px 500px at 90% 10%, rgba(99, 102, 241, 0.05), transparent 40%);
  background-repeat: no-repeat;
  background-size: cover;
  background-attachment: fixed;
  color: var(--text);
  line-height: 1.6;
  opacity: 1;
  /* Added transitions for theme switching */
  transition: opacity 0.6s ease, background-color 0.4s ease, color 0.4s ease;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

main { flex: 1; }

/* Damascus Texture Overlay - Preserved */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background: url('https://www.transparenttextures.com/patterns/damascus-steel.png') repeat;
  opacity: 0.03;
  pointer-events: none;
  z-index: 1;
}

/* ============================
   Navigation - Glassmorphism Refined
============================ */
nav {
  position: fixed;
  top: 0;
  width: 100%;
  background: rgba(13, 15, 20, 0.7);
  backdrop-filter: blur(15px);
  -webkit-backdrop-filter: blur(15px);
  border-bottom: 1px solid var(--border-glass);
  z-index: 1000;
  height: 58px;
  transition: background-color 0.4s ease;
}

/* Light mode nav adjustment */
:root.light-mode nav {
  background: rgba(255, 255, 255, 0.85);
}

.nav-container {
  max-width: 1100px;
  margin: auto;
  padding: 0 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 100%;
}

nav a {
  display: inline-block;
  padding: 0.45rem 1rem; /* Accessibility hit-area preserved */
  border-radius: 8px;
  background: transparent;
  color: var(--muted);
  text-decoration: none;
  transition: all 0.3s ease;
  font-family: 'Lexend Deca', sans-serif;
  font-weight: 500;
}

.logo {
  font-weight: 700;
  font-family: 'Lexend Deca', sans-serif;
  font-size: 1.4rem;
  color: var(--accent);
  flex-shrink: 0;
  margin-left: 1rem;
}

nav ul {
  list-style: none;
  display: flex;
  gap: 2rem;
  padding: 0;
  margin: 0 auto;
}

nav a.active,
nav a:hover {
  background: var(--accent-soft);
  color: var(--accent);
  box-shadow: 0 4px 12px var(--accent-glow);
}

/* --- ADDED: Theme Toggle Button Style --- */
#theme-toggle {
  background: var(--accent-soft);
  border: 1px solid var(--accent);
  color: var(--accent);
  width: 36px;
  height: 36px;
  border-radius: 8px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  transition: transform 0.2s ease, background 0.3s;
  margin-left: 1rem;
}

#theme-toggle:hover {
  transform: rotate(15deg) scale(1.05);
  background: var(--accent-glow);
}

/* ============================
   Bento Grid & Glass Cards
============================ */
.grid { display: grid; gap: 1.5rem; }

/* Bento Grid System */
.grid-bento {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
  grid-auto-rows: minmax(200px, auto);
}

/* Glassmorphism Card Refinement */
.card {
  background: var(--card); /* Updated to use dynamic var */
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  padding: 2rem;
  border-radius: 20px;
  border: 1px solid var(--border); /* Updated to use dynamic var */
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
  transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  position: relative;
  z-index: 2;
}

.card:hover {
  transform: translateY(-8px);
  border-color: var(--accent);
  box-shadow: 0 15px 35px -10px var(--accent-glow);
}

/* Feature card for Bento Grid */
.card-large {
  grid-column: span 2;
  grid-row: span 2;
}

/* ============================
   Sections & Transitions
============================ */
section {
  max-width: 1100px;
  margin: auto;
  padding: 4rem 1.5rem;
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.8s ease;
  position: relative;
  z-index: 2;
}

section.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ============================
   Hero Section
============================ */
.hero {
  min-height: 60vh;
  display: flex;
  align-items: center;
  padding-top: 5rem;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}

.hero h1 {
  font-size: clamp(2.2rem, 4vw, 3rem);
  margin-bottom: 1rem;
  letter-spacing: -1px;
}

.hero h1 span { color: var(--accent); }

.hero p {
  color: var(--muted);
  max-width: 500px;
  margin-bottom: 2rem;
}

/* ============================
   Buttons
============================ */
.btn {
  padding: 0.7rem 1.5rem;
  border-radius: 10px;
  font-weight: 500;
  text-decoration: none;
  transition: all 0.25s ease;
  display: inline-block;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 4px 15px var(--accent-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 30px var(--accent-glow);
}

.btn-secondary {
  border: 1px solid var(--border);
  color: var(--text);
  background: rgba(255, 255, 255, 0.03);
}

.btn-secondary:hover { background: var(--accent-soft); }

/* ============================
   Images & Glow - Enhanced
============================ */
.hero-image {
  border-radius: 20px;
  overflow: hidden;
  border: 1px solid var(--border);
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
}

.hero-image img {
  width: 100%;
  height: auto;
  object-fit: cover;
}

img {
  transition: box-shadow 0.4s ease, transform 0.4s ease;
}

img:hover {
  box-shadow:
    0 0 20px var(--accent-glow),
    0 0 40px rgba(99, 102, 241, 0.2);
  transform: scale(1.02);
}

/* ============================
   Timeline (Refined Centered Axis)
============================ */
.timeline {
  position: relative;
  max-width: 1100px;
  margin: 3rem auto;
}

.timeline::before {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 3px;
  background: var(--accent);
  border-radius: 2px;
  opacity: 0.5;
}

.timeline-item {
  position: relative;
  width: 50%;
  padding: 1rem 2.5rem;
  margin-bottom: 3rem;
}

.timeline-item.left { text-align: right; }
.timeline-item.right { left: 50%; }

.timeline-item::before {
  content: '';
  position: absolute;
  top: 15px;
  width: 18px;
  height: 18px;
  background: var(--bg);
  border: 3px solid var(--accent);
  border-radius: 50%;
  z-index: 10;
}

.timeline-item.left::before { right: -9px; }
.timeline-item.right::before { left: -9px; }

/* ============================
   Gallery
============================ */
.gallery {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
  margin-top: 2rem;
}

.gallery img {
  width: 100%;
  height: 250px;
  object-fit: cover;
  border-radius: 16px;
  border: 1px solid var(--border);
}

/* ============================
   Banner - Glassmorphism
============================ */
.banner {
  max-width: 1000px;
  width: 90%;
  margin: 3rem auto;
  padding: 4rem 2rem;
  background: var(--card-glass);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-glass);
  border-left: 6px solid var(--accent);
  border-radius: 20px;
  text-align: center;
  box-shadow: 0 10px 30px rgba(0,0,0,0.2);
}

/* ============================
   Advanced Effects (Preserved & Optimized)
============================ */
.fluid-drop {
  position: fixed;
  width: 30px;
  height: 30px;
  background: var(--accent-soft);
  border-radius: 50%;
  pointer-events: none;
  transform: translate(-50%, -50%) scale(0);
  opacity: 0.7;
  z-index: 9999;
  animation: drop 0.6s ease-out forwards;
}

@keyframes drop {
  0% { transform: translate(-50%, -50%) scale(0); opacity: 0.7; }
  100% { transform: translate(-50%, -50%) scale(2.5); opacity: 0; }
}

.cursor-mist {
  position: fixed;
  width: 15px;
  height: 15px;
  background: rgba(180, 120, 255, 0.25);
  border-radius: 50%;
  pointer-events: none;
  z-index: 9999;
  filter: blur(16px);
  transition: width 0.3s ease, height 0.3s ease, background 0.3s ease;
  will-change: transform, opacity;
}

/* ============================
   Footer - REPLACED WITH DETAILED VERSION
============================ */
.detailed-footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-glass);
  padding: 4rem 2rem 2rem;
  margin-top: 5rem;
  transition: background-color 0.4s ease;
}

.footer-grid {
  max-width: 1100px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 3rem;
}

.footer-col h4 {
  color: var(--accent);
  margin-bottom: 1.2rem;
  font-family: 'Lexend Deca', sans-serif;
}

.footer-col ul { list-style: none; }
.footer-col ul li { margin-bottom: 0.8rem; }
.footer-col a { color: var(--muted); text-decoration: none; transition: color 0.3s; }
.footer-col a:hover { color: var(--accent); }

.footer-bottom {
  max-width: 1100px;
  margin: 3rem auto 0;
  padding-top: 2rem;
  border-top: 1px solid var(--border-glass);
  text-align: center;
  color: var(--muted);
  font-size: 0.85rem;
}

/* ============================
   Responsive Adjustments
============================ */
@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; text-align: center; }
  .hero-image { width: 80%; margin: auto; }
  
  /* Adjusted nav container for toggle button space */
  .nav-container { padding-right: 1rem; }
  .nav-links { display: none; } 
  
  .timeline::before { left: 20px; transform: none; }
  .timeline-item { width: 100%; left: 0; text-align: left; padding-left: 50px; }
  .timeline-item::before { left: 11px; }
  
  /* Footer responsive */
  .footer-grid { grid-template-columns: 1fr; gap: 2rem; }
}

@media (max-width: 700px) {
  .gallery { grid-template-columns: 1fr; }
  .card-large { grid-column: span 1; }
}