/* ==========================================================================
   CSS Variables & Theming
   ========================================================================== */
:root {
    --bg-base: #f8fafc;
    --bg-gradient: radial-gradient(circle at top left, #e0e7ff, #f8fafc, #f1f5f9);
    --text-main: #0f172a;
    --text-muted: #475569;
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(255, 255, 255, 0.5);
    --glass-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.07);
    --primary: #4f46e5;
    --primary-hover: #4338ca;
    --secondary: #0ea5e9;
    --card-bg: #ffffff;
    --border-color: #e2e8f0;
}

[data-theme="dark"] {
    --bg-base: #0f172a;
    --bg-gradient: radial-gradient(circle at top left, #1e1b4b, #0f172a, #172554);
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --glass-bg: rgba(30, 41, 59, 0.7);
    --glass-border: rgba(255, 255, 255, 0.08);
    --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.3);
    --primary: #6366f1;
    --primary-hover: #818cf8;
    --secondary: #38bdf8;
    --card-bg: #1e293b;
    --border-color: #334155;
}

/* ==========================================================================
   Base & Reset
   ========================================================================== */
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
    font-family: 'Inter', sans-serif;
    background: var(--bg-gradient);
    background-color: var(--bg-base);
    color: var(--text-main);
    line-height: 1.6;
    overflow-x: hidden;
    transition: background-color 0.3s ease, color 0.3s ease;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

h1, h2, h3, h4, h5, h6 { font-family: 'Poppins', sans-serif; font-weight: 600; line-height: 1.2; margin-bottom: 1rem; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
button { cursor: pointer; font-family: inherit; }

/* Utilities */
.text-center { text-align: center; }
.text-gradient {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}
.mb-2 { margin-bottom: 2rem; }
.section-padding { padding: 5rem 2rem; }

/* Glassmorphism */
.glass-panel {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
    border-radius: 16px;
}

/* ==========================================================================
   Navigation
   ========================================================================== */
.glass-nav {
    position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
    background: var(--glass-bg); backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--glass-border);
}
.nav-container {
    max-width: 1400px; margin: 0 auto; padding: 1rem 2rem;
    display: flex; justify-content: space-between; align-items: center;
}
.logo { font-size: 1.5rem; font-weight: 700; display: flex; align-items: center; gap: 0.5rem; color: var(--text-main); }
.logo i { color: var(--primary); }

.search-bar { position: relative; flex: 0 1 400px; display: none; }
.search-bar input {
    width: 100%; padding: 0.75rem 1rem 0.75rem 2.5rem; border-radius: 50px;
    border: 1px solid var(--border-color); background: var(--card-bg);
    color: var(--text-main); outline: none; transition: 0.3s;
}
.search-bar input:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2); }
.search-bar i { position: absolute; left: 1rem; top: 50%; transform: translateY(-50%); color: var(--text-muted); }

.nav-links { display: flex; gap: 2rem; align-items: center; }
.nav-links a { font-weight: 500; color: var(--text-muted); transition: color 0.2s; }
.nav-links a:hover { color: var(--primary); }
#theme-toggle { background: none; border: none; color: var(--text-main); font-size: 1.25rem; padding: 0.5rem; border-radius: 50%; transition: 0.3s; }
#theme-toggle:hover { background: var(--glass-border); }

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero {
    min-height: 90vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 8rem 2rem 2rem;
    max-width: 900px;
    margin: 0 auto;
}
.hero h1 { font-size: clamp(2.5rem, 6vw, 4.5rem); margin-bottom: 1.5rem; animation: fadeInUp 0.8s ease; }
.hero p { font-size: clamp(1rem, 2vw, 1.25rem); color: var(--text-muted); margin-bottom: 2.5rem; animation: fadeInUp 1s ease; }
.hero-btns { display: flex; gap: 1rem; justify-content: center; animation: fadeInUp 1.2s ease; width: 100%; }

/* Buttons */
.btn {
    padding: 0.75rem 1.5rem; border-radius: 50px; font-weight: 600; font-size: 1rem;
    border: none; display: inline-flex; align-items: center; justify-content: center; gap: 0.5rem; transition: all 0.3s ease;
}
.btn-primary { background: linear-gradient(135deg, var(--primary), var(--secondary)); color: white; box-shadow: 0 4px 15px rgba(99, 102, 241, 0.4); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(99, 102, 241, 0.6); }
.btn-secondary { background: var(--glass-bg); color: var(--text-main); border: 1px solid var(--glass-border); }
.btn-secondary:hover { background: var(--border-color); transform: translateY(-2px); }

/* ==========================================================================
   Grid & Layouts
   ========================================================================== */
.grid-container {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 2rem;
    max-width: 1400px; margin: 0 auto; padding: 2rem;
}
.tool-card {
    padding: 2rem; text-align: center; position: relative; overflow: hidden;
    transition: transform 0.3s ease, box-shadow 0.3s ease; cursor: pointer; display: block;
}
.tool-card:hover { transform: translateY(-10px); }
.tool-icon { font-size: 2.5rem; margin-bottom: 1rem; color: var(--primary); }
.popular-badge {
    position: absolute; top: 1rem; right: -2rem; background: #ef4444; color: white;
    font-size: 0.75rem; font-weight: bold; padding: 0.25rem 2.5rem; transform: rotate(45deg);
}

.content-wrapper { max-width: 900px; margin: 0 auto; padding: 3rem 2rem; }
.benefits-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 1.5rem; margin-top: 2rem; }
.benefit-card { padding: 1.5rem; text-align: center; }
.benefit-card i { font-size: 2rem; color: var(--secondary); margin-bottom: 1rem; }

/* ==========================================================================
   Tool Pages Specific (MPA)
   ========================================================================== */
main { flex: 1; }
.tool-view { max-width: 1000px; margin: 8rem auto 2rem; padding: 2rem; }
.tool-controls { display: grid; gap: 1.5rem; margin-bottom: 2rem; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); }
.control-group { display: flex; flex-direction: column; gap: 0.5rem; }
.control-group input, .control-group select, .control-group textarea {
    padding: 0.75rem; border-radius: 8px; border: 1px solid var(--border-color);
    background: var(--card-bg); color: var(--text-main); outline: none;
}
.tool-actions { display: flex; gap: 1rem; flex-wrap: wrap; justify-content: center; margin-bottom: 2rem; }
.tool-result-area { min-height: 200px; padding: 2rem; display: flex; flex-wrap: wrap; gap: 1rem; justify-content: center; align-items: center; }
.result-card { background: var(--card-bg); padding: 1.5rem; border-radius: 12px; border: 1px solid var(--border-color); text-align: center; min-width: 150px; animation: zoomIn 0.3s ease; }

.seo-content { max-width: 1000px; margin: 0 auto 4rem; padding: 3rem; }
.seo-content h2 { margin-top: 2rem; border-bottom: 2px solid var(--border-color); padding-bottom: 0.5rem; }
.seo-content p, .seo-content ul { margin-bottom: 1.5rem; color: var(--text-muted); }
.seo-content ul { padding-left: 1.5rem; }
.seo-content li { margin-bottom: 0.5rem; }
details { background: var(--card-bg); margin-bottom: 1rem; border-radius: 8px; border: 1px solid var(--border-color); overflow: hidden; }
summary { padding: 1rem; font-weight: 600; cursor: pointer; list-style: none; display: flex; justify-content: space-between; align-items: center; }
summary::-webkit-details-marker { display: none; }
summary:after { content: '\f078'; font-family: 'FontAwesome'; color: var(--primary); }
details[open] summary:after { content: '\f077'; }
details p { padding: 0 1rem 1rem; margin: 0; }

/* ==========================================================================
   Footer & Toast
   ========================================================================== */
.toast {
    position: fixed; bottom: 2rem; right: 2rem; z-index: 9999;
    padding: 1rem 2rem; border-radius: 8px; background: var(--text-main);
    color: var(--bg-base); font-weight: 500; transform: translateY(150%); transition: 0.3s;
}
.toast.show { transform: translateY(0); }

footer { background: var(--card-bg); border-top: 1px solid var(--border-color); padding: 4rem 2rem 2rem; margin-top: 4rem; }
.footer-grid { max-width: 1400px; margin: 0 auto; display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 3rem; margin-bottom: 3rem; }
.footer-col ul { display: flex; flex-direction: column; gap: 0.75rem; }
.footer-col ul a { color: var(--text-muted); transition: color 0.2s; }
.footer-col ul a:hover { color: var(--primary); }
.social-icons { display: flex; gap: 1rem; margin-top: 1rem; font-size: 1.5rem; }
.newsletter { display: flex; gap: 0.5rem; margin-top: 1rem; }
.newsletter input { flex: 1; padding: 0.75rem; border-radius: 8px; border: 1px solid var(--border-color); background: var(--bg-base); color: var(--text-main); }
.footer-bottom { text-align: center; color: var(--text-muted); border-top: 1px solid var(--border-color); padding-top: 2rem; }

@keyframes fadeInUp { from { opacity: 0; transform: translateY(30px); } to { opacity: 1; transform: translateY(0); } }
@keyframes zoomIn { from { opacity: 0; transform: scale(0.9); } to { opacity: 1; transform: scale(1); } }

/* Media Queries */
@media (min-width: 769px) { .search-bar { display: block; } }
@media (max-width: 768px) {
    .nav-links { gap: 1rem; }
    .hero { padding-top: 8rem; }
    .hero-btns { flex-direction: column; width: 100%; }
    .btn { width: 100%; }
}