/* ===================================
   TECH & SCIENCE BLOG - MODERN DESIGN
   =================================== */

/* ===== CSS VARIABLES ===== */
:root {
    /* Science-inspired color palette */
    --primary-blue: #0A4D8C;
    --primary-dark: #062D4F;
    --primary-light: #1E88E5;
    --accent-teal: #00ACC1;
    --accent-purple: #7B1FA2;
    --accent-orange: #FF6F00;

    /* Neutral colors */
    --white: #FFFFFF;
    --off-white: #F8F9FA;
    --light-gray: #E8EAED;
    --medium-gray: #5F6368;
    --dark-gray: #202124;

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #0A4D8C 0%, #1E88E5 100%);
    --gradient-accent: linear-gradient(135deg, #00ACC1 0%, #7B1FA2 100%);
    --gradient-hero: linear-gradient(135deg, #062D4F 0%, #0A4D8C 50%, #1E88E5 100%);

    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.15);
    --shadow-xl: 0 12px 36px rgba(0, 0, 0, 0.2);

    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    --font-display: 'Poppins', var(--font-primary);

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2.5rem;
    --spacing-xl: 4rem;

    /* Border radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
}

/* ===== RESET & BASE ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    line-height: 1.7;
    background: var(--off-white);
    color: var(--dark-gray);
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Import Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Poppins:wght@600;700;800&display=swap');

/* ===== HEADER & NAVIGATION ===== */
header {
    background: var(--gradient-hero);
    color: var(--white);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow-md);
    backdrop-filter: blur(10px);
}

header .logo h1 {
    font-family: var(--font-display);
    font-size: clamp(1.5rem, 4vw, 2.2rem);
    font-weight: 800;
    letter-spacing: -0.5px;
    background: linear-gradient(135deg, #FFFFFF 0%, #B3E5FC 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.5rem;
}

nav ul {
    list-style: none;
    padding: 0;
    margin: 0.8rem 0 0 0;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

nav ul li {
    display: inline-block;
}

nav ul li a {
    color: var(--white);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    padding: 0.6rem 1.2rem;
    border-radius: var(--radius-md);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

nav ul li a::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.1);
    transform: scaleX(0);
    transform-origin: right;
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: -1;
}

nav ul li a:hover::before {
    transform: scaleX(1);
    transform-origin: left;
}

nav ul li a:hover {
    background: rgba(255, 255, 255, 0.15);
    transform: translateY(-2px);
}

/* ===== SECTIONS ===== */
.section {
    padding: var(--spacing-xl) 8%;
    max-width: 1400px;
    margin: 0 auto;
}

/* Section Headings */
h1, h2 {
    font-family: var(--font-display);
    font-weight: 700;
    color: var(--primary-dark);
    margin-bottom: var(--spacing-md);
    line-height: 1.2;
}

h1 {
    font-size: clamp(2rem, 5vw, 3.5rem);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

h2 {
    font-size: clamp(1.8rem, 4vw, 2.8rem);
    text-align: center;
    position: relative;
    padding-bottom: var(--spacing-md);
}

h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: var(--gradient-accent);
    border-radius: 2px;
}

h3 {
    font-family: var(--font-display);
    font-size: clamp(1.3rem, 3vw, 1.8rem);
    color: var(--primary-blue);
    margin: var(--spacing-lg) 0 var(--spacing-sm);
    font-weight: 600;
}

p {
    font-size: 1.05rem;
    line-height: 1.8;
    color: var(--medium-gray);
    margin-bottom: var(--spacing-md);
    text-align: left;
}

/* ===== ABOUT SECTION ===== */
.about-container,
.services-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.about-text,
.service-card {
    background: var(--white);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    border: 1px solid transparent;
}

.about-text:hover,
.service-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: var(--accent-teal);
}

.about-image {
    position: relative;
    overflow: hidden;
    border-radius: var(--radius-lg);
}

.about-image img {
    width: 100%;
    height: auto;
    border-radius: var(--radius-lg);
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.about-image:hover img {
    transform: scale(1.05);
}

/* ===== SERVICE CARDS ===== */
.service-card {
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: var(--gradient-accent);
}

.service-card h3 {
    color: var(--primary-dark);
    margin-bottom: var(--spacing-sm);
    font-size: 1.4rem;
}

.service-card p {
    color: var(--medium-gray);
    font-size: 1rem;
}

/* ===== ARTICLE ENTRIES ===== */
#results-container {
    padding: var(--spacing-md) 8%;
    max-width: 1200px;
    margin: 0 auto;
}

.entry {
    background: var(--white);
    border: 1px solid var(--light-gray);
    border-radius: var(--radius-lg);
    margin: var(--spacing-lg) 0;
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.entry::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 5px;
    height: 100%;
    background: var(--gradient-primary);
    transform: scaleY(0);
    transform-origin: bottom;
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.entry:hover::before {
    transform: scaleY(1);
    transform-origin: top;
}

.entry:hover {
    transform: translateX(8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-light);
}

.entry h2 {
    font-size: clamp(1.4rem, 3vw, 1.9rem);
    color: var(--primary-dark);
    margin-bottom: var(--spacing-sm);
    text-align: left;
    padding-bottom: 0;
}

.entry h2::after {
    display: none;
}

.entry p {
    font-size: 0.95rem;
    line-height: 1.7;
    color: var(--medium-gray);
    margin-bottom: var(--spacing-sm);
}

.entry p strong {
    font-weight: 600;
    color: var(--primary-blue);
}

.entry a {
    display: inline-flex;
    align-items: center;
    margin-top: var(--spacing-sm);
    padding: 0.7rem 1.5rem;
    background: var(--gradient-primary);
    color: var(--white);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.9rem;
    border-radius: var(--radius-md);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: var(--shadow-sm);
}

.entry a:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    background: var(--gradient-accent);
}

.entry a::after {
    content: '→';
    margin-left: 0.5rem;
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.entry a:hover::after {
    transform: translateX(4px);
}

/* Star Rating */
.entry .star-rating {
    font-size: 1.1rem;
    color: var(--accent-orange);
    margin-top: var(--spacing-sm);
}

.entry .star-rating span {
    margin-right: 0.2rem;
}

/* ===== SEARCH SECTION ===== */
.search-section {
    background: var(--white);
    padding: var(--spacing-lg);
    margin: var(--spacing-lg) 8%;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    max-width: 1200px;
    margin-left: auto;
    margin-right: auto;
}

.filters {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    align-items: center;
}

.filters label {
    font-weight: 600;
    color: var(--primary-dark);
    font-size: 0.9rem;
}

.filters select,
.filters input[type="text"],
.filters input[type="date"] {
    padding: 0.7rem 1rem;
    border: 2px solid var(--light-gray);
    border-radius: var(--radius-sm);
    font-family: var(--font-primary);
    font-size: 0.95rem;
    transition: all 0.3s ease;
    background: var(--off-white);
}

.filters select:focus,
.filters input[type="text"]:focus,
.filters input[type="date"]:focus {
    outline: none;
    border-color: var(--primary-blue);
    background: var(--white);
    box-shadow: 0 0 0 3px rgba(10, 77, 140, 0.1);
}

.filters input[type="text"] {
    flex: 1;
    min-width: 250px;
}

/* ===== BREADCRUMBS ===== */
nav[aria-label="breadcrumb"] {
    background: var(--off-white);
    padding: var(--spacing-md) 8%;
    border-bottom: 1px solid var(--light-gray);
}

nav[aria-label="breadcrumb"] ol {
    list-style: none;
    display: flex;
    gap: var(--spacing-sm);
    padding: 0;
    margin: 0;
    font-size: 0.9rem;
    flex-wrap: wrap;
}

nav[aria-label="breadcrumb"] a {
    color: var(--primary-blue);
    text-decoration: none;
    transition: color 0.3s ease;
    font-weight: 500;
}

nav[aria-label="breadcrumb"] a:hover {
    color: var(--accent-teal);
    text-decoration: underline;
}

/* ===== FOOTER ===== */
footer {
    background: var(--gradient-hero);
    color: var(--white);
    text-align: center;
    padding: var(--spacing-lg);
    margin-top: var(--spacing-xl);
    font-size: 0.95rem;
}

footer p {
    color: rgba(255, 255, 255, 0.9);
    margin: 0;
}

/* ===== UTILITY CLASSES ===== */
.text-center {
    text-align: center;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* ===== LISTS ===== */
ul, ol {
    margin: var(--spacing-md) 0;
    padding-left: var(--spacing-lg);
}

li {
    margin-bottom: var(--spacing-sm);
    line-height: 1.7;
    color: var(--medium-gray);
}

li strong {
    color: var(--primary-dark);
    font-weight: 600;
}

/* ===== RESPONSIVE DESIGN ===== */

/* Tablets */
@media (max-width: 768px) {
    :root {
        --spacing-xl: 2.5rem;
        --spacing-lg: 1.8rem;
    }

    header .logo h1 {
        font-size: 1.6rem;
    }

    nav ul {
        gap: 0.5rem;
    }

    nav ul li a {
        padding: 0.5rem 0.8rem;
        font-size: 0.85rem;
    }

    .section {
        padding: var(--spacing-lg) 5%;
    }

    .about-container,
    .services-container {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    .filters {
        flex-direction: column;
        align-items: stretch;
    }

    .filters input[type="text"] {
        min-width: 100%;
    }

    .search-section {
        margin: var(--spacing-md) 5%;
    }

    #results-container {
        padding: var(--spacing-md) 5%;
    }
}

/* Mobile */
@media (max-width: 480px) {
    body {
        font-size: 15px;
    }

    h1 {
        font-size: 2rem;
    }

    h2 {
        font-size: 1.6rem;
    }

    h3 {
        font-size: 1.3rem;
    }

    .entry {
        padding: var(--spacing-md);
    }

    nav ul {
        flex-direction: column;
        gap: 0.3rem;
    }

    nav ul li a {
        display: block;
        text-align: center;
    }
}

/* ===== ANIMATIONS ===== */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.entry {
    animation: fadeIn 0.5s ease-out;
}

/* ===== ACCESSIBILITY ===== */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus styles for accessibility */
a:focus,
button:focus,
input:focus,
select:focus {
    outline: 3px solid var(--accent-teal);
    outline-offset: 2px;
}

/* ===== PRINT STYLES ===== */
@media print {
    header,
    nav,
    footer,
    .filters {
        display: none;
    }

    body {
        background: white;
    }

    .entry {
        page-break-inside: avoid;
        box-shadow: none;
        border: 1px solid #000;
    }
}