/* CSS Reset & Variables */
:root {
    --bg-color: #fcfcfc;
    --text-main: #111111;
    --text-muted: #666666;
    --accent: #4338ca;
    --accent-hover: #3730a3;
    --card-bg: #ffffff;
    --border-color: #eaeaea;
    --tag-free-bg: #e0f2fe;
    --tag-free-text: #0369a1;
    --tag-paid-bg: #fef3c7;
    --tag-paid-text: #b45309;
    --optimal-bg: #e0e7ff;
    --optimal-text: #3730a3;
    --optimal-border: #818cf8;
    --watermark-color: rgba(67, 56, 202, 0.09);
    --nav-bg: rgba(252, 252, 252, 0.95);
    --shadow-subtle: 0 4px 20px rgba(0, 0, 0, 0.04);
    --shadow-hover: 0 20px 35px rgba(67, 56, 202, 0.08);
    --danger: #ef4444;
}

/* Dark Mode Variables */
body.dark-mode {
    --bg-color: #0d1117;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --accent: #6366f1;
    --accent-hover: #818cf8;
    --card-bg: #1e293b;
    --border-color: #334155;
    --tag-free-bg: #064e3b;
    --tag-free-text: #34d399;
    --tag-paid-bg: #78350f;
    --tag-paid-text: #fbbf24;
    --optimal-bg: #172033;
    --optimal-text: #818cf8;
    --optimal-border: #4f46e5;
    --watermark-color: rgba(255, 255, 255, 0.03);
    --nav-bg: rgba(13, 17, 23, 0.95);
    --shadow-subtle: 0 4px 20px rgba(0, 0, 0, 0.3);
    --shadow-hover: 0 20px 35px rgba(0, 0, 0, 0.5);
    --danger: #f87171;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.6;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Sticky Navigation */
nav {
    padding: 1.5rem 5%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--nav-bg);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid transparent;
    transition: all 0.3s ease;
}

nav.scrolled {
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 5%;
}

.logo {
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: -0.5px;
    color: var(--text-main);
    text-decoration: none;
    cursor: pointer;
}

.nav-controls { display: flex; align-items: center; gap: 1.5rem; }

.nav-search {
    display: flex; background: var(--bg-color); border: 1px solid var(--border-color);
    border-radius: 30px; overflow: hidden; opacity: 0; pointer-events: none;
    width: 0; transition: all 0.3s ease;
}

nav.scrolled .nav-search { opacity: 1; pointer-events: all; width: 250px; }

.nav-search input {
    border: none; background: transparent; padding: 0.5rem 1rem;
    color: var(--text-main); outline: none; width: 100%; font-size: 0.9rem;
}

.nav-icons { display: flex; gap: 1rem; align-items: center; }

.icon-btn {
    background: transparent; border: 1px solid var(--border-color);
    color: var(--text-main); font-size: 0.85rem; font-weight: 600;
    padding: 0.5rem 1rem; border-radius: 20px; cursor: pointer;
    transition: background 0.2s ease;
}

.icon-btn:hover { background: var(--border-color); }

/* Language Dropdown Menu */
.dropdown-wrapper { position: relative; }

.dropdown-menu {
    position: absolute; top: 120%; right: 0; background: var(--card-bg);
    border: 1px solid var(--border-color); border-radius: 12px;
    box-shadow: var(--shadow-subtle); width: 160px; display: none;
    flex-direction: column; overflow: hidden; z-index: 200;
}

.dropdown-menu.show { display: flex; }

.lang-option {
    padding: 0.75rem 1rem; font-size: 0.85rem; color: var(--text-main);
    background: transparent; border: none; text-align: left;
    cursor: pointer; transition: background 0.2s ease;
}

.lang-option:hover { background: var(--bg-color); color: var(--accent); }

/* Hero Section */
.hero {
    display: flex; flex-direction: column; align-items: center; justify-content: center;
    text-align: center; padding: 6rem 5% 4rem; max-width: 900px; margin: 0 auto;
}

.hero h1 {
    font-size: clamp(3rem, 6vw, 5.5rem); font-weight: 800; line-height: 1.1;
    letter-spacing: -0.04em; margin-bottom: 1.5rem;
    background: linear-gradient(135deg, var(--text-main) 0%, var(--accent) 100%);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent; transition: background 0.3s ease;
}

.hero p.tagline { font-size: 1.25rem; color: var(--text-muted); margin-bottom: 2.5rem; max-width: 600px; }

/* Search / Input Area */
.search-container {
    display: flex; width: 100%; max-width: 600px; background: var(--card-bg);
    border: 1px solid var(--border-color); border-radius: 50px; padding: 0.5rem;
    box-shadow: var(--shadow-subtle); transition: box-shadow 0.3s ease, border-color 0.3s ease;
}

.search-container:focus-within { box-shadow: 0 4px 25px rgba(67, 56, 202, 0.15); border-color: var(--accent); }

.search-container input {
    flex: 1; border: none; background: transparent; padding: 1rem 1.5rem;
    font-size: 1rem; outline: none; color: var(--text-main);
}

.btn-search {
    background-color: var(--accent); color: white; border: none; padding: 0 2rem;
    border-radius: 40px; font-size: 1rem; font-weight: 600; cursor: pointer;
}

.btn-search:hover { background-color: var(--accent-hover); }

/* Quick Filter Pills */
.filter-pills { display: flex; gap: 0.75rem; margin-top: 1.5rem; flex-wrap: wrap; justify-content: center; }
.pill { background: transparent; border: 1px solid var(--border-color); color: var(--text-muted); padding: 0.4rem 1rem; border-radius: 20px; font-size: 0.85rem; font-weight: 500; cursor: pointer; }
.pill:hover { border-color: var(--accent); color: var(--accent); }

/* Landing Content */
.landing-content { flex: 1; padding: 2rem 5% 6rem; max-width: 1100px; margin: 0 auto; text-align: center; }
.topline { display: inline-flex; align-items: center; gap: 0.5rem; padding: 0.45rem 0.9rem; border-radius: 999px; background: rgba(67, 56, 202, 0.08); color: var(--accent); font-size: 0.7rem; letter-spacing: 0.12em; text-transform: uppercase; font-weight: 700; margin-bottom: 1rem; }
.section-tag { font-size: 0.8rem; color: var(--accent); font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase; margin-bottom: 0.8rem; }
.trust-header { font-size: 1.75rem; font-weight: 700; margin-bottom: 2rem; }
.trust-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 1.5rem; margin-bottom: 5rem; }
.trust-card { background: var(--card-bg); border: 1px solid var(--border-color); border-radius: 16px; padding: 2rem; text-align: left; }
.trust-card h3 { font-size: 1.1rem; margin-bottom: 0.5rem; color: var(--text-main); }
.trust-card p { font-size: 0.9rem; color: var(--text-muted); }
.feature-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 1.5rem; margin: 2rem 0 5rem; }
.feature-card { background: var(--card-bg); border: 1px solid var(--border-color); border-radius: 18px; padding: 1.5rem; text-align: left; box-shadow: var(--shadow-subtle); }
.feature-card h3 { font-size: 1.1rem; margin-bottom: 0.7rem; }
.feature-card p { font-size: 0.9rem; color: var(--text-muted); }
.feature-icon { display: inline-flex; align-items: center; justify-content: center; width: 46px; height: 46px; border-radius: 12px; background: rgba(67, 56, 202, 0.08); font-size: 1.25rem; margin-bottom: 1rem; }
.project-metrics { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 1rem; margin: 1rem 0 4rem; }
.metric-box { background: var(--card-bg); border: 1px solid var(--border-color); border-radius: 16px; padding: 1.25rem; }
.metric-value { font-size: 1.8rem; font-weight: 800; letter-spacing: -0.04em; color: var(--text-main); }
.metric-label { font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--text-muted); }

/* Generic Section Container */
.section-container { padding: 2rem 5% 4rem; max-width: 1200px; margin: 0 auto; width: 100%; display: none; }
.results-main-header { margin-bottom: 3rem; font-size: 1.75rem; font-weight: 700; letter-spacing: -0.02em; }
.tier-section { margin-bottom: 3.5rem; }
.tier-header { display: flex; align-items: center; gap: 0.75rem; font-size: 1.25rem; font-weight: 600; margin-bottom: 1.5rem; color: var(--text-main); }

.tier-badge { font-size: 0.75rem; padding: 0.25rem 0.75rem; border-radius: 20px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.5px; }
.badge-paid { background-color: var(--tag-paid-bg); color: var(--tag-paid-text); }
.badge-free { background-color: var(--tag-free-bg); color: var(--tag-free-text); }

.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 1.5rem; align-items: start; }

/* Card Styling */
.card {
    background: var(--card-bg); border: 1px solid var(--border-color); border-radius: 16px; padding: 1.5rem; display: flex; flex-direction: column; justify-content: space-between; position: relative; cursor: default; transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.3s ease, border-color 0.3s ease; overflow: hidden;
}
.card:hover { transform: translateY(-8px); border-color: var(--accent); box-shadow: var(--shadow-hover); }
.card-content { position: relative; z-index: 2; pointer-events: auto; }

/* Bookmark Button */
.bookmark-btn { position: absolute; top: 20px; right: 20px; z-index: 10; background: var(--bg-color); border: 1px solid var(--border-color); color: var(--text-muted); border-radius: 50%; width: 32px; height: 32px; display: flex; align-items: center; justify-content: center; cursor: pointer; font-size: 1rem; transition: all 0.2s ease; }
.bookmark-btn:hover { color: var(--accent); border-color: var(--accent); }
.bookmark-btn.saved { background: var(--accent); color: white; border-color: var(--accent); }
.card.is-optimal .bookmark-btn { right: auto; left: 20px; }

/* Unstack Button */
.unstack-btn { position: absolute; top: 20px; right: 20px; z-index: 10; background: var(--bg-color); border: 1px solid var(--border-color); color: var(--text-muted); border-radius: 20px; padding: 0.3rem 0.75rem; font-size: 0.75rem; font-weight: 600; cursor: pointer; transition: all 0.2s ease; display: flex; align-items: center; gap: 0.3rem; }
.unstack-btn:hover { color: var(--danger); border-color: var(--danger); background: rgba(239, 68, 68, 0.05); }

/* Optimal Card Specifics */
.card.is-optimal { border: 2px solid var(--accent); background: linear-gradient(180deg, var(--card-bg) 0%, var(--optimal-bg) 100%); padding: 2.5rem; }
@media (min-width: 768px) { .card.is-optimal { grid-column: span 2; } }

.optimal-badge { position: absolute; top: 20px; right: 20px; background: var(--accent); color: white; font-size: 0.65rem; font-weight: 700; padding: 0.3rem 0.75rem; border-radius: 20px; text-transform: uppercase; z-index: 3; transform-origin: center; }

.model-type { font-size: 0.65rem; text-transform: uppercase; letter-spacing: 1px; color: var(--accent); font-weight: 700; margin-bottom: 0.25rem; }
.card h3 { font-size: 1.25rem; margin-bottom: 0.5rem; color: var(--text-main); }
.card p { color: var(--text-muted); font-size: 0.85rem; margin-bottom: 1.5rem; }
.card-footer { display: flex; justify-content: space-between; align-items: center; border-top: 1px solid var(--border-color); padding-top: 1rem; font-size: 0.75rem; color: #888; }

.card.is-optimal .model-type { font-size: 0.75rem; }
.card.is-optimal h3 { font-size: 1.75rem; margin-bottom: 0.75rem; margin-top: 1rem; }
.card.is-optimal p { font-size: 1rem; }

/* Animations */
.shine-layer { position: absolute; top: 0; left: -150%; width: 50%; height: 100%; background: linear-gradient(to right, rgba(255,255,255,0) 0%, rgba(255,255,255,0.3) 50%, rgba(255,255,255,0) 100%); transform: skewX(-25deg); z-index: 1; pointer-events: none; }
.graffiti-bg { position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%) scale(1); font-size: 5.5rem; font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; font-weight: 900; letter-spacing: -0.03em; text-transform: uppercase; color: var(--watermark-color); white-space: nowrap; z-index: 1; opacity: 0; pointer-events: none; }
.card.is-optimal:hover .shine-layer { animation: shineAnim 0.7s ease-in-out; }
.card.is-optimal:hover .graffiti-bg { animation: netflixReveal 0.8s cubic-bezier(0.16, 1, 0.3, 1) forwards; }

@keyframes shineAnim { 0% { left: -150%; } 100% { left: 200%; } }
@keyframes netflixReveal { 0% { opacity: 0; transform: translate(-50%, -50%) scale(1.5); filter: blur(8px); letter-spacing: 0.1em; } 50% { opacity: 1; filter: blur(0px); } 100% { opacity: 1; transform: translate(-50%, -50%) scale(1); filter: blur(0px); letter-spacing: -0.03em; } }

/* Verdict Section */
.verdict-section { background: var(--card-bg); border: 2px solid var(--accent); border-radius: 20px; padding: 2.5rem; margin-bottom: 3.5rem; box-shadow: var(--shadow-subtle); position: relative; overflow: hidden; }
.verdict-header { font-size: 1.1rem; font-weight: 600; text-transform: uppercase; letter-spacing: 1px; color: var(--text-muted); margin-bottom: 0.5rem; }
.verdict-title { font-size: 1.75rem; font-weight: 800; margin-bottom: 1rem; color: var(--text-main); }
.verdict-title span { color: var(--accent); }
.verdict-content { color: var(--text-muted); font-size: 1.05rem; line-height: 1.7; margin-bottom: 2rem; max-width: 800px; }
.why-points { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 1.5rem; }
.why-point-card { background: var(--bg-color); border: 1px solid var(--border-color); border-radius: 12px; padding: 1.25rem; }
.why-point-card h4 { font-size: 0.95rem; color: var(--accent); margin-bottom: 0.5rem; }
.why-point-card p { font-size: 0.875rem; color: var(--text-muted); }

/* Comparison Table & Calculator */
.comparison-section { background: var(--card-bg); border: 1px solid var(--border-color); border-radius: 20px; padding: 2.5rem; margin-bottom: 3.5rem; overflow-x: auto; }
.comparison-header-box { display: flex; justify-content: space-between; align-items: center; margin-bottom: 1.5rem; flex-wrap: wrap; gap: 1rem; }
.comparison-header { font-size: 1.35rem; font-weight: 700; color: var(--text-main); }

.calculator-box { display: flex; align-items: center; gap: 0.5rem; background: var(--bg-color); border: 1px solid var(--border-color); padding: 0.4rem 1rem; border-radius: 20px; font-size: 0.85rem; color: var(--text-muted); }
.calculator-box input { border: none; background: transparent; width: 80px; font-weight: 700; color: var(--text-main); outline: none; border-bottom: 1px solid var(--text-muted); }

table.comparison-table { width: 100%; border-collapse: collapse; text-align: left; font-size: 0.95rem; color: var(--text-main); }
table.comparison-table th, table.comparison-table td { padding: 1rem 1.25rem; border-bottom: 1px solid var(--border-color); }
table.comparison-table th { font-weight: 600; background-color: var(--bg-color); }
tr.highlight-row td { background-color: var(--optimal-bg); font-weight: 500; }
tr.highlight-row td:first-child { color: var(--accent); font-weight: 800; }

/* Error Section */
.error-section { padding: 4rem 5%; max-width: 600px; margin: 0 auto; text-align: center; display: none; }
.error-icon { font-size: 3.5rem; margin-bottom: 1rem; }
.error-section h2 { font-size: 1.75rem; font-weight: 800; margin-bottom: 1rem; color: var(--text-main); }
.error-section p { color: var(--text-muted); font-size: 1.05rem; margin-bottom: 1rem; line-height: 1.6; }
.suggestion-box { background: var(--card-bg); border: 1px solid var(--border-color); border-radius: 16px; padding: 2rem; text-align: left; margin-top: 2rem; }
.suggestion-box h4 { font-size: 0.95rem; color: var(--text-main); margin-bottom: 1rem; text-transform: uppercase; }
.suggestion-box ul { list-style: none; padding: 0; }
.suggestion-box li { position: relative; padding-left: 1.5rem; margin-bottom: 0.75rem; color: var(--accent); font-weight: 500; cursor: pointer; }
.suggestion-box li:before { content: "→"; position: absolute; left: 0; color: var(--text-muted); }

/* Footer */
footer { text-align: center; padding: 2rem 5%; color: var(--text-muted); margin-top: auto; }
.footer-main { font-size: 0.85rem; font-weight: 600; margin-bottom: 0.5rem; color: var(--text-main); }
.footer-disclaimer { font-size: 0.75rem; color: #999; max-width: 600px; margin: 0 auto; line-height: 1.5; }

/* --- Footer Links (AdSense Compliance) --- */
.footer-links {
    margin-top: 1rem;
    display: flex;
    justify-content: center;
    gap: 1.5rem;
}
.footer-links a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 600;
    transition: color 0.2s ease;
}
.footer-links a:hover {
    color: var(--accent);
}

/* --- Resources / Blog Section --- */
.resources-section {
    padding: 2rem 5% 4rem;
    max-width: 1000px;
    margin: 0 auto;
    display: none; /* Hidden by default */
}
.blog-post {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 2.5rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow-subtle);
    transition: box-shadow 0.3s ease, border-color 0.3s ease;
}
.blog-post:hover {
    box-shadow: var(--shadow-hover);
    border-color: var(--accent);
}
.blog-post h3 {
    font-size: 1.75rem;
    color: var(--text-main);
    margin-bottom: 1rem;
    letter-spacing: -0.02em;
}
.blog-meta {
    font-size: 0.85rem;
    color: var(--accent);
    font-weight: 700;
    margin-bottom: 1.5rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}
.blog-post p {
    color: var(--text-muted);
    line-height: 1.8;
    margin-bottom: 1.25rem;
    font-size: 1.05rem;
}

/* --- Related Questions (People Also Ask) Section --- */
.related-questions-section {
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
}

.related-questions-title {
    font-size: 1.25rem;
    color: var(--text-main);
    margin-bottom: 1.25rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.paa-container {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.paa-item {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
    transition: border-color 0.2s ease;
}

.paa-item:hover {
    border-color: var(--accent);
}

.paa-question {
    width: 100%;
    padding: 1.2rem 1.5rem;
    background: none;
    border: none;
    color: var(--text-main);
    font-size: 1rem;
    font-weight: 600;
    text-align: left;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
}

.paa-icon {
    font-size: 1.2rem;
    transition: transform 0.3s ease;
    color: var(--accent);
}

.paa-item.active .paa-icon {
    transform: rotate(180deg);
}

.paa-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out, padding 0.3s ease;
    padding: 0 1.5rem;
    color: var(--text-muted);
    line-height: 1.6;
    font-size: 0.95rem;
    background: var(--bg-color);
}

.paa-item.active .paa-answer {
    padding: 0 1.5rem 1.25rem 1.5rem;
    max-height: 600px;
}