/* --- RESET & VARIABLES --- */
:root {
    --bg-dark: #0a0a0a;
    --bg-card: #141414;
    --text-main: #e0e0e0;
    --text-muted: #888888;
    --accent: #FFD700; /* Safety Yellow/Gold */
    --accent-hover: #e6c200;
    --danger: #ff4444;
    --glass: rgba(20, 20, 20, 0.85);
    --border: rgba(255, 255, 255, 0.1);
    --font-main: 'Helvetica Neue', Helvetica, Arial, sans-serif;
    --transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    --lightbox-bg: rgba(0, 0, 0, 0.95);
}

body.light-mode {
    --bg-dark: #f4f4f4;
    --bg-card: #ffffff;
    --text-main: #1a1a1a;
    --text-muted: #555555;
    --accent: #d4b200; /* Slightly darker gold for contrast on white */
    --glass: rgba(255, 255, 255, 0.9);
    --border: rgba(0, 0, 0, 0.1);
    --lightbox-bg: rgba(255, 255, 255, 0.95);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    background-color: var(--bg-dark);
    color: var(--text-main);
    font-family: var(--font-main);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    transition: background-color 0.4s ease, color 0.4s ease;
}

/* --- TYPOGRAPHY --- */
h1, h2, h3, h4 { font-weight: 700; letter-spacing: -0.02em; line-height: 1.1; }
h2 {
    font-size: clamp(2rem, 5vw, 3.5rem);
    margin-bottom: 2rem;
    position: relative;
    display: inline-block;
}
h2::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 0;
    width: 60px;
    height: 4px;
    background-color: var(--accent);
}
p { margin-bottom: 1.5rem; color: var(--text-muted); }
a { text-decoration: none; color: inherit; transition: var(--transition); }

/* --- UTILITIES --- */
.container { max-width: 1200px; margin: 0 auto; padding: 0 2rem; }
.btn {
    display: inline-block;
    padding: 1rem 2rem;
    background: transparent;
    border: 1px solid var(--accent);
    color: var(--accent);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    cursor: pointer;
    position: relative;
    overflow: hidden;
    z-index: 1;
}
.btn::before {
    content: '';
    position: absolute;
    top: 0; left: 0; width: 0%; height: 100%;
    background: var(--accent); z-index: -1; transition: var(--transition);
}
.btn:hover::before { width: 100%; }
.btn:hover { color: var(--bg-dark); }

/* --- NAVIGATION --- */
nav {
    position: fixed; top: 0; left: 0; width: 100%; padding: 1.5rem 0; z-index: 1000;
    background: var(--glass); backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border); transition: transform 0.3s ease, background-color 0.4s ease;
}
.nav-inner { display: flex; justify-content: space-between; align-items: center; }
.logo { font-size: 1.5rem; font-weight: 800; text-transform: uppercase; color: var(--text-main); }
.logo span { color: var(--accent); }

.nav-right { display: flex; align-items: center; gap: 2rem; }

.nav-links { display: flex; gap: 2rem; }
.nav-links a { font-size: 0.9rem; text-transform: uppercase; letter-spacing: 1px; opacity: 0.7; color: var(--text-main); }
.nav-links a:hover { opacity: 1; color: var(--accent); }
.hamburger { display: none; cursor: pointer; font-size: 1.5rem; color: var(--text-main); }

/* Theme Toggle Button */
.theme-toggle {
    background: none; border: none; cursor: pointer; font-size: 1.2rem; color: var(--text-main);
    padding: 0.5rem; transition: transform 0.3s ease;
}
.theme-toggle:hover { transform: rotate(15deg); color: var(--accent); }

/* --- HERO SECTION --- */
.hero-scroll-trigger {
    height: 200vh; /* Create extra scroll depth for the animation */
    position: relative;
}

.hero {
    height: 100vh; display: flex; align-items: center; position: sticky; top: 0; overflow: hidden;
    /* Force dark-mode text colors for hero section to maintain contrast with background image */
    --text-main: #e0e0e0;
    --text-muted: #888888;
    color: var(--text-main);
}
.hero p.hero-sub { color: var(--text-muted); }
.hero-bg {
    position: absolute; top: 0; left: 0; width: 100%; height: 100%;
    background: linear-gradient(rgba(0,0,0,0.3), rgba(0,0,0,0.3)), url('../images/tmountain.jpg');
    background-size: cover;
    background-position: center;
    z-index: -1;
    transition: filter 0.2s ease;
    filter: brightness(0.7);
}

.hero-sun {
    position: absolute;
    width: 150px;
    height: 150px;
    background: radial-gradient(circle, #FFD700 0%, rgba(255, 215, 0, 0) 70%);
    border-radius: 50%;
    filter: blur(20px);
    z-index: 0;
    pointer-events: none;
    opacity: 0.8;
    box-shadow: 0 0 100px 40px rgba(255, 215, 0, 0.4);
    transform: translate(-50%, -50%);
    will-change: left, top;
}

.hero h1 {
    font-size: clamp(3rem, 8vw, 6rem); margin-bottom: 1.5rem;
    position: relative;
    z-index: 1;
    /* Dynamic spotlight gradient */
    background: radial-gradient(circle at var(--sun-x, 0%) var(--sun-y, 100%), var(--accent) 0%, var(--text-main) 20%, var(--text-muted) 50%);
    background-size: 200% 200%;
    background-position: center;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    transition: background-image 0.1s linear;
}

/* --- SECTIONS ANIMATION --- */
section { padding: 6rem 0; opacity: 0; transform: translateY(30px); transition: opacity 1s ease, transform 1s var(--transition); }
section.visible { opacity: 1; transform: translateY(0); }

/* --- ABOUT SECTION --- */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 4rem;
    align-items: center;
}
.about-image {
    display: flex;
    justify-content: center;
    align-items: center;
}
.about-profile-img {
    width: 350px;
    height: 350px;
    object-fit: cover;
    border-radius: 50%;
    border: 2px solid var(--border);
    transition: var(--transition);
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
}
.about-profile-img:hover {
    transform: translateY(-10px) scale(1.05);
    border-color: var(--accent);
    box-shadow: 0 15px 40px rgba(255, 215, 0, 0.3), 0 0 20px rgba(255, 215, 0, 0.1);
}
@media (max-width: 992px) {
    .about-profile-img {
        width: 280px;
        height: 280px;
    }
    .about-grid { grid-template-columns: 1fr; gap: 2rem; }
    .about-image { order: 2; }
    .about-text { order: 1; }
}

/* --- GRID & CARDS --- */
.grid-services { 
    display: grid; 
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); 
    gap: 2rem; 
    margin-top: 3rem; 
}

/* Ensure 4 columns on large desktops */
@media (min-width: 1200px) {
    .grid-services {
        grid-template-columns: repeat(4, 1fr);
    }
}

.card {
    background: var(--bg-card); border: 1px solid var(--border); padding: 2.5rem;
    transition: var(--transition);
}
.card:hover { 
    transform: translateY(-12px) scale(1.02); 
    border-color: var(--accent); 
    box-shadow: 0 10px 30px rgba(255, 215, 0, 0.2), 0 0 20px rgba(255, 215, 0, 0.1);
}
.card-icon { font-size: 2rem; color: var(--accent); margin-bottom: 1.5rem; transition: var(--transition); }
.card:hover .card-icon { transform: scale(1.2) rotate(5deg); }

/* --- GALLERY --- */
.gallery-grid {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 1rem; margin-top: 3rem;
}
.gallery-item {
    position: relative; overflow: hidden; border-radius: 4px; cursor: pointer; height: 250px;
    background-color: var(--bg-card); border: 1px solid var(--border);
    transition: var(--transition);
}
.gallery-item:hover {
    transform: translateY(-8px) scale(1.02);
    border-color: var(--accent);
    box-shadow: 0 10px 30px rgba(255, 215, 0, 0.2), 0 0 20px rgba(255, 215, 0, 0.1);
    z-index: 10;
}
.gallery-item img {
    width: 100%; height: 100%; object-fit: cover; 
    transition: transform 0.5s ease, filter 0.5s ease;
    filter: grayscale(100%) brightness(0.7);
}
.gallery-item:hover img { 
    transform: scale(1.1); 
    filter: grayscale(0%) brightness(1);
}
.gallery-overlay {
    position: absolute; top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0,0,0,0.5); opacity: 0; transition: 0.3s;
    display: flex; align-items: center; justify-content: center;
}
.gallery-item:hover .gallery-overlay { opacity: 1; }
.gallery-icon { color: #fff; font-size: 2rem; }

/* Lightbox */
.lightbox {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    background: var(--lightbox-bg); z-index: 2000;
    display: none; align-items: center; justify-content: center;
    opacity: 0; transition: opacity 0.3s ease;
}
.lightbox.active { display: flex; opacity: 1; }
.lightbox-content { max-width: 90%; max-height: 90%; border-radius: 4px; box-shadow: 0 0 20px rgba(0,0,0,0.5); }
.lightbox-close {
    position: absolute; top: 20px; right: 30px; font-size: 3rem; color: var(--text-main);
    cursor: pointer; z-index: 2001;
}

.lightbox-nav {
    position: absolute; top: 50%; transform: translateY(-50%);
    background: rgba(0,0,0,0.3); color: #fff; border: none;
    font-size: 2rem; padding: 1rem; cursor: pointer; z-index: 2001;
    transition: var(--transition); border-radius: 4px;
}
.lightbox-nav:hover { background: var(--accent); color: var(--bg-dark); }
.lightbox-prev { left: 20px; }
.lightbox-next { right: 20px; }

/* --- CALCULATOR (UPDATED STYLES) --- */
.calculator-wrapper {
    background: var(--bg-card); border: 1px solid var(--border);
    padding: 2rem; border-radius: 4px; margin-top: 2rem;
    box-shadow: 0 20px 50px rgba(0,0,0,0.5);
    transition: var(--transition);
}

.calculator-wrapper:hover, .calculator-wrapper:focus-within {
    border-color: var(--accent);
    box-shadow: 0 10px 40px rgba(255, 215, 0, 0.15), 0 0 20px rgba(255, 215, 0, 0.05);
    transform: translateY(-5px);
}

.calc-header-row {
    display: grid; grid-template-columns: 2fr 1fr 1fr auto; gap: 1rem;
    padding: 0 1rem; margin-bottom: 1rem; font-weight: bold; color: var(--accent);
    text-transform: uppercase; font-size: 0.8rem; letter-spacing: 1px;
}

.appliance-row {
    display: grid; grid-template-columns: 2fr 1fr 1fr auto;
    gap: 1rem; align-items: center; margin-bottom: 1rem;
    background: rgba(125, 125, 125, 0.05); /* slightly visible in light/dark */
    padding: 1rem; border-radius: 4px;
    border: 1px solid transparent; transition: var(--transition);
}
.appliance-row:focus-within { border-color: var(--accent); background: rgba(125, 125, 125, 0.1); }

input, select, textarea {
    width: 100%; padding: 0.8rem; background: var(--bg-dark);
    border: 1px solid var(--border); color: var(--text-main);
    font-family: inherit; border-radius: 4px;
}
input:focus, select:focus, textarea:focus { outline: none; border-color: var(--accent); }

.btn-calc {
    width: 100%; background: var(--accent); color: var(--bg-dark);
    border: none; font-weight: bold; text-transform: uppercase; padding: 1rem;
    cursor: pointer; margin-top: 1rem; font-size: 1rem;
    transition: transform 0.2s;
}
.btn-calc:active { transform: scale(0.98); }

.btn-remove {
    background: transparent; color: var(--danger); border: 1px solid var(--danger);
    padding: 0.5rem 1rem; cursor: pointer; border-radius: 4px;
}
.btn-remove:hover { background: var(--danger); color: white; }

.results-container {
    margin-top: 3rem; display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem; opacity: 0.5; filter: blur(5px); pointer-events: none;
    transition: var(--transition);
}
.results-container.active { opacity: 1; filter: blur(0); pointer-events: all; }

.result-card {
    text-align: center; padding: 1.5rem; background: rgba(255,215,0,0.05);
    border: 1px solid rgba(255,215,0,0.2); border-radius: 4px;
}
.result-val { font-size: 2rem; font-weight: 800; color: var(--accent); display: block; }
.result-lbl { font-size: 0.8rem; text-transform: uppercase; color: var(--text-muted); letter-spacing: 1px; }

/* --- FAQ ACCORDION --- */
.faq-accordion {
    max-width: 800px; margin: 3rem auto 0;
}
.faq-item {
    background: var(--bg-card); border: 1px solid var(--border);
    margin-bottom: 1rem; border-radius: 4px; overflow: hidden;
    transition: var(--transition);
}
.faq-item:hover {
    border-color: var(--accent);
    box-shadow: 0 5px 20px rgba(255, 215, 0, 0.15);
    transform: translateY(-4px);
}
.faq-question {
    width: 100%; padding: 1.5rem; background: none; border: none;
    display: flex; justify-content: space-between; align-items: center;
    color: var(--text-main); font-size: 1.1rem; font-weight: 600; text-align: left;
    cursor: pointer; transition: var(--transition);
}
.faq-question:hover { color: var(--accent); }
.faq-icon { font-size: 1.5rem; color: var(--accent); transition: transform 0.3s ease; }
.faq-item.active .faq-icon { transform: rotate(45deg); }

.faq-answer {
    max-height: 0; overflow: hidden; transition: max-height 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    padding: 0 1.5rem;
}
.faq-item.active .faq-answer {
    max-height: 500px; /* Large enough to fit content */
    padding-bottom: 1.5rem;
}
.faq-answer p { margin-bottom: 0; }

/* Responsive */
@media (max-width: 768px) {
    .calc-header-row, .appliance-row { grid-template-columns: 1fr; gap: 0.5rem; text-align: left; }
    .btn-remove { width: 100%; margin-top: 0.5rem; }
    
    .nav-links {
        display: none;
        position: fixed; top: 80px; left: 0; width: 100%;
        background: var(--bg-card);
        flex-direction: column; padding: 2rem;
        border-bottom: 1px solid var(--border);
        box-shadow: 0 10px 30px rgba(0,0,0,0.5);
    }
    .nav-links.active { display: flex; }
    
    .hamburger { display: block; }
}