:root {
  /* Light Mode Variables */
  --primary-color: #0d6efd; 
  --secondary-color: #6c757d;
  --bg-color: #ffffff;
  --surface-color: #ffffff;
  --text-color: #212529;
  --text-secondary: #6c757d;
  --card-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  --card-hover-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
  --border-color: #e9ecef;
  --nav-bg: #f8f9fa; /* Light Grey */
  --grid-color: rgba(13, 110, 253, 0.07);
  --terminal-bg: #1e1e1e;
  --input-bg: #ffffff;
  --input-border: #ced4da;
  --input-text: #212529;
}

[data-theme="dark"] {
  /* Dark Mode Variables */
  --primary-color: #60a5fa; 
  --secondary-color: #9ca3af;
  --bg-color: #121212;
  --surface-color: #1e1e1e;
  --text-color: #e5e7eb;
  --text-secondary: #9ca3af;
  --card-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
  --card-hover-shadow: 0 10px 15px rgba(0, 0, 0, 0.5);
  --border-color: #333333;
  --nav-bg: #18181b; /* Dark Grey */
  --grid-color: rgba(96, 165, 250, 0.08);
  --input-bg: #2d2d2d;
  --input-border: #444;
  --input-text: #ffffff;
}

/* Base Resets */
html, body {
  overflow-x: hidden;
  font-family: 'Nunito Sans', sans-serif;
  color: var(--text-color);
  background-color: var(--bg-color);
  transition: background-color 0.3s ease, color 0.3s ease;
}

/* --- HARD SWAP UTILITIES --- */
/* We map Bootstrap's generic classes to our specific theme variables */
.bg-light {
    background-color: var(--nav-bg) !important;
    transition: background-color 0.3s ease;
}
.bg-dark {
    background-color: var(--nav-bg) !important; /* Force to match theme dark grey */
    transition: background-color 0.3s ease;
}
.bg-surface {
    background-color: var(--surface-color) !important;
    transition: background-color 0.3s ease;
}

/* Navbar */
.navbar {
    transition: background-color 0.3s ease, box-shadow 0.3s ease;
}
.navbar-brand {
    color: var(--primary-color) !important;
}
/* Ensure sticky header has shadow */
.navbar.fixed-top {
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}
html[data-theme="dark"] #header-nav {
    background: #18181b !important;
    background-color: #18181b !important;
    box-shadow: 0 2px 10px rgba(0,0,0,0.5);
    border-bottom: 1px solid #333;
}
[data-theme="dark"] .navbar .nav-link {
    color: var(--text-color) !important;
}
[data-theme="dark"] .navbar .nav-link:hover {
    color: var(--primary-color) !important;
}

/* Toggle Icons */
.navbar-toggler { border-color: var(--text-secondary); }
.navbar-toggler-icon {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(108, 117, 125, 1)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}
[data-theme="dark"] .navbar-toggler-icon {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(255, 255, 255, 1)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}

/* Theme Toggle Button */
#theme-toggle {
    border: 1px solid var(--border-color);
    color: var(--text-color);
    background: var(--surface-color);
    width: 35px;
    height: 35px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}
#theme-toggle:hover { background: var(--border-color); }
.fa-sun { color: #f59e0b; } 
.fa-moon { color: var(--primary-color); } 

/* Terminal */
.terminal-window {
    background: var(--terminal-bg);
    border-radius: 8px;
    font-family: 'Fira Code', monospace;
    overflow: hidden;
    color: #fff;
    border: 1px solid #333;
    min-height: 300px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.15);
}
[data-theme="dark"] .terminal-window {
    box-shadow: none; 
    border: 1px solid #444;
}

.terminal-header {
    background: #2d2d2d;
    padding: 10px 15px;
    display: flex;
    align-items: center;
    border-bottom: 1px solid #333;
}
.terminal-header .buttons span {
    display: inline-block;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    margin-right: 6px;
}
.close { background: #ff5f56; }
.minimize { background: #ffbd2e; }
.maximize { background: #27c93f; }
.terminal-header .title {
    margin-left: 15px;
    font-size: 0.85rem;
    color: #aaa;
}
.terminal-body { padding: 20px; }
.command-line { color: #4af626; font-weight: 500; }
.prompt { color: #fff; margin-right: 8px;}
.output-text { color: #ccc; font-size: 0.9rem; white-space: pre-wrap; }
.cursor { animation: blink 1s step-end infinite; }
@keyframes blink { 50% { opacity: 0; } }

/* Dashboard */
.status-dashboard { border: 1px solid var(--border-color); }
.dashboard-header {
    background-color: var(--nav-bg);
    border-bottom: 1px solid var(--border-color);
    color: var(--text-color);
    font-size: 0.9rem;
}
.dashboard-item {
    border-bottom: 1px solid var(--border-color);
    color: var(--text-color);
}
.dashboard-item:last-child { border-bottom: none; }
.status-indicator {
    display: inline-flex;
    align-items: center;
    font-size: 0.8rem;
    font-weight: 700;
}
.status-indicator::before {
    content: "";
    width: 8px;
    height: 8px;
    border-radius: 50%;
    margin-right: 8px;
}
.operational::before { background-color: #27c93f; box-shadow: 0 0 5px #27c93f; }
.operational { color: #27c93f; }

/* Timeline */
.timeline {
    position: relative;
    padding-left: 3rem;
    border-left: 2px solid var(--border-color);
}
.timeline-item {
    position: relative;
    margin-bottom: 3rem;
}
.timeline-icon {
    position: absolute;
    left: -4.3rem;
    top: 0;
    width: 2.6rem;
    height: 2.6rem;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 4px solid var(--bg-color);
    z-index: 2;
}
.timeline-content {
    border: 1px solid var(--border-color);
    transition: transform 0.3s;
}
.timeline-content:hover { transform: translateX(5px); }

/* Social Icons */
.social-nav .nav-link {
    font-size: 1.5rem;
    color: var(--secondary-color) !important;
    transition: color 0.3s;
}
[data-theme="dark"] .social-nav .nav-link { color: #ffffff !important; }
.social-nav .nav-link:hover { color: var(--primary-color) !important; }

/* Contact Inputs */
.form-control {
    background-color: var(--input-bg);
    border-color: var(--input-border);
    color: var(--input-text);
}
.form-control:focus {
    background-color: var(--input-bg);
    color: var(--input-text);
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.25rem rgba(13, 110, 253, 0.25);
}

/* Cards & Modals */
.project-card {
    border: 1px solid var(--border-color);
    transition: transform 0.3s, box-shadow 0.3s;
    cursor: pointer;
}
.project-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--card-hover-shadow);
    border-color: var(--primary-color);
}
.modal-content {
    background-color: var(--surface-color);
    color: var(--text-color);
    border: 1px solid var(--border-color);
}
.btn-close { filter: invert(var(--invert-icon)); }
[data-theme="dark"] .btn-close { filter: invert(1); }

/* Utilities */
.text-secondary { color: var(--text-secondary) !important; }
.marker { position: relative; display: inline-block; color: var(--text-color); }
.marker::after {
    content: ""; display: block; width: 100%; height: 6px;
    background-color: rgba(13, 110, 253, 0.2);
    position: absolute; bottom: 2px; left: 0; z-index: -1;
}
/* Active nav link */
.navbar .nav-link.active {
    color: var(--primary-color) !important;
    font-weight: 700;
}

/* Always-fixed navbar body offset */
body { padding-top: 56px; }

.cover {
    background-color: var(--bg-color);
    background-image:
        linear-gradient(var(--grid-color) 1px, transparent 1px),
        linear-gradient(90deg, var(--grid-color) 1px, transparent 1px);
    background-size: 50px 50px;
    padding-bottom: 4rem;
    animation: gridScroll 12s linear infinite;
}
@keyframes gridScroll {
    0% { background-position: 0 0; }
    100% { background-position: 50px 50px; }
}
.wave-bg {
    height: 150px; width: 100%;
    background-image: url("../images/wave-bg.svg");
    background-position: center bottom;
    background-repeat: no-repeat;
    background-size: cover;
    margin-top: -100px;
    position: relative; z-index: 1;
}
#scrolltop {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    z-index: 999;
    visibility: hidden;
    opacity: 0;
    transition: opacity 0.3s ease, visibility 0.3s ease, transform 0.3s ease;
}
#scrolltop a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background-color: var(--primary-color);
    color: #fff;
    font-size: 0.9rem;
    text-decoration: none;
    box-shadow: 0 4px 15px rgba(13, 110, 253, 0.4);
    transition: background-color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
}
#scrolltop a:hover {
    background-color: var(--primary-color);
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(13, 110, 253, 0.5);
}
[data-theme="dark"] #scrolltop a {
    box-shadow: 0 4px 15px rgba(96, 165, 250, 0.3);
}
[data-theme="dark"] #scrolltop a:hover {
    box-shadow: 0 8px 20px rgba(96, 165, 250, 0.45);
}
.section { scroll-margin-top: 5rem; }