:root {
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(255, 255, 255, 0.5);
    --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-hover: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
}

/* Glassmorphism Navbar */
.glass-nav {
    position: sticky;
    top: 0;
    z-index: 100;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--glass-border);
    box-shadow: var(--shadow-sm);
}

.nav-logo {
    font-weight: 800;
    font-size: 1.25rem;
    color: var(--accent);
    letter-spacing: -0.5px;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 600;
    margin-left: 1.5rem;
    transition: color 0.2s ease;
}

.nav-links a:hover, .nav-links a.active {
    color: var(--accent);
}

.nav-links i {
    margin-right: 0.25rem;
}

/* Header */
.blog-header {
    text-align: center;
    padding: 1.5rem 1rem;
    background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 100%);
    margin-bottom: 1rem;
}

.blog-header h1 {
    font-size: 2.5rem;
    font-weight: 800;
    letter-spacing: -1px;
    margin-bottom: 0.5rem;
    color: #1e3a8a;
}

.blog-header p {
    font-size: 1rem;
    color: var(--text-secondary);
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem 4rem;
}

/* CSS Grid for Cards */
.blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 2rem;
    margin-bottom: 4rem;
}

/* Blog Cards with Micro-Animations */
.blog-card {
    background: var(--card-bg);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1), box-shadow 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    flex-direction: column;
}

.blog-card:hover {
    transform: translateY(-5px) scale(1.02);
    box-shadow: var(--shadow-hover);
}

.card-image-wrapper {
    position: relative;
    width: 100%;
    height: 200px;
    background-color: #e2e8f0;
    overflow: hidden;
}

.card-image-wrapper img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.blog-card:hover .card-image-wrapper img {
    transform: scale(1.05);
}

.category-badge {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: var(--glass-bg);
    backdrop-filter: blur(4px);
    color: var(--text-primary);
    padding: 0.25rem 0.75rem;
    border-radius: 999px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.card-content {
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.card-content h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    line-height: 1.3;
}

.post-body {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 1.5rem;
    flex-grow: 1;
    overflow: hidden;
    position: relative;
    max-height: 4.5em; /* Approximately 3 lines */
}

.post-body::after {
    content: "";
    position: absolute;
    bottom: 0;
    right: 0;
    width: 100%;
    height: 1.5em;
    background: linear-gradient(to bottom, transparent, var(--card-bg));
}

/* Actions */
.card-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-top: 1px solid #f1f5f9;
    padding-top: 1rem;
}

.like-btn {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1.25rem;
    color: #cbd5e1;
    transition: color 0.2s, transform 0.2s;
}

.like-btn:hover {
    color: #ef4444;
}

.like-btn.liked {
    color: #ef4444;
    animation: pulse 0.3s ease-in-out;
}

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.3); }
    100% { transform: scale(1); }
}

.edit-btn {
    background: transparent;
    border: 1px solid var(--accent);
    color: var(--accent);
    padding: 0.25rem 0.75rem;
    border-radius: 6px;
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

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

/* Glass Panel for Admin Form */
.glass-panel {
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    padding: 2rem;
    box-shadow: var(--shadow-md);
    max-width: 800px;
    margin: 0 auto;
}

.new-post-container h2 {
    margin-bottom: 1.5rem;
    font-weight: 800;
}

.post-form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.post-form input[type="text"], .post-form select {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid #cbd5e1;
    border-radius: 8px;
    font-family: inherit;
    font-size: 1rem;
    background: #f8fafc;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.post-form input[type="text"]:focus, .post-form select:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.file-upload-wrapper input[type="file"] {
    width: 100%;
    padding: 0.75rem;
    border: 1px dashed #cbd5e1;
    border-radius: 8px;
    background: #f8fafc;
    cursor: pointer;
}

.editable-textarea {
    width: 100%;
    min-height: 200px;
    padding: 1rem;
    border: 1px solid #cbd5e1;
    border-radius: 8px;
    background: #f8fafc;
    font-family: inherit;
    font-size: 1rem;
}

.editable-textarea:empty:before {
    content: attr(placeholder);
    color: #94a3b8;
}

.btn-primary {
    background: var(--accent);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s;
    align-self: flex-start;
}

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

/* Alert Boxes */
.alert {
    padding: 1rem;
    border-radius: 8px;
    margin-top: 1rem;
    display: none;
    font-weight: 600;
}

.alert.success { background-color: #dcfce7; color: #166534; }
.alert.warning { background-color: #fef08a; color: #854d0e; }
.alert.info { background-color: #dbeafe; color: #1e40af; }

/* Auth Modal Styles */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(5px);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.modal-content {
    position: relative;
    width: 100%;
    max-width: 400px;
    padding: 2.5rem;
    animation: modalFadeIn 0.3s ease-out;
}

.close-modal {
    position: absolute;
    top: 15px;
    right: 20px;
    color: var(--text-secondary);
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
    transition: color 0.3s ease;
}

.close-modal:hover,
.close-modal:focus {
    color: var(--primary-color);
    text-decoration: none;
}

@keyframes modalFadeIn {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* --- RESPONSIVE MOBILE DESIGN --- */
@media (max-width: 768px) {
  /* Prevent horizontal scroll globally */
  body { overflow-x: hidden; }
  .container { max-width: 100% !important; padding: 0 1rem 2rem; box-sizing: border-box; }

  .glass-nav { padding: 1rem; }
  .nav-links { display: none; flex-direction: column; width: 100%; position: absolute; top: 100%; left: 0; background: var(--card-bg); border-bottom: 1px solid var(--glass-border); padding: 0.5rem 1rem; box-shadow: var(--shadow-md); }
  .nav-links.active { display: flex; max-height: 80vh; overflow-y: auto; }
  .nav-links a { margin: 0.2rem 0; padding: 0.2rem 0.5rem; text-align: left; }
  .hamburger { display: block; font-size: 1.5rem; cursor: pointer; color: var(--text-primary); }
  .blog-header { padding: 2rem 1rem; }
  .blog-header h1 { font-size: 2rem; }
  .blog-grid { grid-template-columns: 1fr; }
  .glass-panel { padding: 1rem; box-sizing: border-box; width: 100%; }

  /* Override ALL inline 2-column grids on calculator pages */
  div[style*="grid-template-columns: 1fr 1fr"] { grid-template-columns: 1fr !important; }
  .calc-grid { grid-template-columns: 1fr !important; }

  /* Fix hardcoded widths on unit selects (80px causing overflow in 555/RC filter) */
  select[style*="width: 80px"] { width: auto !important; min-width: 60px !important; flex-shrink: 0; }

  /* Fix input+select rows: prevent them from exceeding container width */
  div[style*="display: flex"][style*="align-items: center"] {
    flex-wrap: wrap;
  }
  div[style*="display: flex"][style*="align-items: center"] input[style*="flex-grow"] {
    min-width: 0 !important;
    width: 100% !important;
  }

  /* Tab buttons: smaller text so they don't overflow on narrow screens */
  div[style*="display: flex"][style*="gap: 1rem"] > button {
    font-size: 0.78rem !important;
    padding: 0.7rem 0.4rem !important;
    line-height: 1.3;
  }

  /* Result box: full width and no overflow */
  .glass-panel > div > div:last-child { width: 100% !important; box-sizing: border-box; }

  /* Adsense placeholders */
  .adsense-placeholder { background: rgba(0,0,0,0.05); border: 1px dashed rgba(0,0,0,0.1); width: 100%; min-height: 100px; display: flex; align-items: center; justify-content: center; color: var(--text-secondary); margin: 1.5rem 0; border-radius: 8px; font-size: 0.9rem; text-transform: uppercase; letter-spacing: 1px; }
  .seo-content { margin-top: 3rem; border-top: 1px solid rgba(255,255,255,0.1); padding-top: 2rem; }
  .seo-content h2 { color: var(--primary-color); margin-bottom: 1rem; }
  .seo-content p { color: var(--text-secondary); margin-bottom: 1rem; line-height: 1.8; }
}
@media (min-width: 769px) {
  .hamburger { display: none; }
  .adsense-placeholder { background: rgba(0,0,0,0.05); border: 1px dashed rgba(0,0,0,0.1); width: 100%; min-height: 100px; display: flex; align-items: center; justify-content: center; color: var(--text-secondary); margin: 2rem 0; border-radius: 8px; font-size: 0.9rem; text-transform: uppercase; letter-spacing: 1px; }
  .seo-content { margin-top: 4rem; border-top: 1px solid rgba(255,255,255,0.1); padding-top: 2rem; }
  .seo-content h2 { color: var(--primary-color); margin-bottom: 1rem; }
  .seo-content p { color: var(--text-secondary); margin-bottom: 1rem; line-height: 1.8; }
}

/* GLOBAL CODE BLOCK STYLING */
pre, .ql-syntax {
    background-color: #1a1a1a !important;
    color: #f8f8f2 !important;
    padding: 1rem;
    border-radius: 8px;
    border: 1px solid rgba(255,255,255,0.1);
    max-width: 100%;
    overflow-x: auto;
    white-space: pre;
    word-wrap: normal;
    font-family: monospace;
}

/* FIX FOR READ MORE OVERFLOW ON MOBILE */
.post-body pre, .post-body .ql-syntax {
    max-height: 4.5em;
    overflow: hidden !important;
    white-space: pre-wrap !important;
    word-break: break-all;
    padding: 0.5rem;
    margin: 0;
}