@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;600;800&display=swap');

:root {
    --bg-color: #0B0F19;
    --surface-color: rgba(255, 255, 255, 0.05);
    --surface-hover: rgba(255, 255, 255, 0.08);
    --border-color: rgba(255, 255, 255, 0.1);
    --text-primary: #F8FAFC;
    --text-secondary: #94A3B8;
    --accent-color: #38BDF8;
    --accent-glow: rgba(56, 189, 248, 0.3);
    --font-family: 'Inter', sans-serif;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: var(--font-family);
    line-height: 1.6;
    overflow-x: hidden;
    scroll-behavior: smooth;
}

a {
    color: var(--accent-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

a:hover {
    color: #7DD3FC;
    text-shadow: 0 0 8px var(--accent-glow);
}

ul {
    list-style-position: inside;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

/* Glassmorphism utility */
.glass {
    background: var(--surface-color);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: 16px;
}

/* Nav */
nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 5%;
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    background: rgba(11, 15, 25, 0.8);
}

nav .logo {
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: 1px;
}

nav .logo span {
    color: var(--accent-color);
}

nav .lang-switch img {
    width: 30px;
    margin-left: 10px;
    border-radius: 4px;
    transition: transform 0.3s ease;
}

nav .lang-switch img:hover {
    transform: scale(1.1);
}

/* Hero Section */
.hero {
    min-height: 90vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 8rem 5% 4rem;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at center, rgba(56, 189, 248, 0.1) 0%, transparent 40%);
    z-index: -1;
}

.hero h1 {
    font-size: clamp(2.5rem, 5vw, 5.5rem);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    background: linear-gradient(to right, #fff, #94A3B8);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero h1 span {
    background: linear-gradient(to right, var(--accent-color), #7DD3FC);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero p {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin-bottom: 3rem;
}

.hero-buttons {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
    justify-content: center;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 1rem 2rem;
    border-radius: 8px;
    font-weight: 600;
    letter-spacing: 0.5px;
    transition: all 0.3s ease;
    cursor: pointer;
}

.btn-primary {
    background: var(--accent-color);
    color: #0B0F19;
    box-shadow: 0 4px 15px var(--accent-glow);
}

.btn-primary:hover {
    background: #7DD3FC;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px var(--accent-glow);
    color: #0B0F19;
    text-shadow: none;
}

.btn-secondary {
    background: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: var(--surface-hover);
    transform: translateY(-2px);
    color: var(--text-primary);
}

/* Tools Section */
.tools-section {
    padding: 5rem 5%;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 800;
    text-align: center;
    margin-bottom: 3rem;
    background: linear-gradient(to right, var(--text-primary), var(--text-secondary));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.tool-card {
    padding: 2.5rem 2rem;
    text-align: center;
    transition: transform 0.3s ease, background 0.3s ease, box-shadow 0.3s ease;
}

.tool-card:hover {
    transform: translateY(-5px);
    background: var(--surface-hover);
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
}

.tool-card i {
    font-size: 2.5rem;
    color: var(--accent-color);
    margin-bottom: 1.5rem;
    display: block;
}

.tool-card h3 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.tool-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 1.5rem;
}

/* Books Section */
.books-section {
    padding: 5rem 5%;
    background: rgba(255,255,255, 0.02);
}

.book-showcase {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 4rem;
    max-width: 1200px;
    margin: 0 auto 8rem;
}

.book-showcase:last-child {
    margin-bottom: 2rem;
}

.book-showcase:nth-child(even) {
    flex-direction: row-reverse;
}

.book-content {
    flex: 1;
    min-width: 300px;
}

.book-content h2 {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
    font-weight: 800;
}

.book-content p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
}

.book-actions {
    margin-top: 2rem;
}

.book-image {
    flex: 1;
    min-width: 300px;
    display: flex;
    justify-content: center;
    position: relative;
    perspective: 1000px;
}

.book-image img {
    max-width: 100%;
    border-radius: 8px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.5), 0 0 0 1px var(--border-color);
    transition: transform 0.5s ease;
    transform: rotateY(-10deg) rotateX(5deg);
}

.book-showcase:nth-child(even) .book-image img {
    transform: rotateY(10deg) rotateX(5deg);
}

.book-image:hover img,
.book-showcase:nth-child(even) .book-image:hover img {
    transform: rotateY(0deg) rotateX(0deg) scale(1.05);
}

.book-image::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 60%;
    height: 80%;
    background: var(--accent-glow);
    filter: blur(80px);
    transform: translate(-50%, -50%);
    z-index: -1;
}

/* Embedded Widget container override */
.widget-container {
    margin: 2rem 0;
    padding: 1.5rem;
}

/* Features Grid */
.features-section {
    padding: 8rem 5%;
    max-width: 1200px;
    margin: 0 auto;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
}

.feature-card {
    display: flex;
    flex-direction: column;
    overflow: hidden;
    transition: transform 0.3s ease;
    height: 100%;
}

.feature-card:hover {
    transform: translateY(-8px);
}

.feature-img {
    height: 220px;
    overflow: hidden;
    position: relative;
}

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

.feature-card:hover .feature-img img {
    transform: scale(1.08);
}

.feature-content {
    padding: 2rem;
    flex-grow: 1;
}

.feature-content h3 {
    margin-bottom: 1rem;
    font-size: 1.3rem;
}

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

/* Footer & Contact */
footer {
    text-align: center;
    padding: 6rem 5% 3rem;
    margin-top: 2rem;
    position: relative;
}

footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 10%;
    width: 80%;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--border-color), transparent);
}

.footer-content {
    max-width: 600px;
    margin: 0 auto;
}

.footer-content h2 {
    font-size: 2.2rem;
    margin-bottom: 1.5rem;
}

.footer-content p {
    color: var(--text-secondary);
    margin-bottom: 2rem;
    font-size: 1.1rem;
}

.social-links {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin-top: 2.5rem;
    margin-bottom: 3rem;
}

.social-links a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    font-size: 1.2rem;
    transition: all 0.3s ease;
}

.social-links a:hover {
    background: var(--accent-color);
    color: #0B0F19;
    transform: translateY(-5px);
    box-shadow: 0 5px 20px var(--accent-glow);
}

.copyright {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

@media (max-width: 768px) {
    .book-showcase, .book-showcase:nth-child(even) {
        flex-direction: column;
        text-align: center;
    }
    .hero {
        padding-top: 10rem;
    }
    .hero h1 {
        font-size: 2.8rem;
    }
}

/* Tool Pages Form Utilities */
.tool-page-container {
    padding: 10rem 5% 5rem;
    min-height: 80vh;
}

.tool-form-wrapper {
    max-width: 700px;
    margin: 0 auto;
    padding: 3rem;
}

.tool-form-wrapper h1, .tool-page-container h1 {
    font-size: 2.2rem;
    margin-bottom: 2rem;
    color: var(--text-primary);
    text-align: center;
}

.tool-form-wrapper p, .tool-page-container p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    font-size: 1.05rem;
}

.tool-form-wrapper table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0 1.25rem;
}

.tool-form-wrapper td {
    padding: 0.5rem;
    vertical-align: middle;
}

.tool-form-wrapper input[type="text"], 
.tool-form-wrapper select {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.75rem 1rem;
    border-radius: 8px;
    font-family: var(--font-family);
    width: 100%;
    transition: all 0.3s ease;
}

.tool-form-wrapper input[type="text"]:focus, 
.tool-form-wrapper select:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 10px var(--accent-glow);
}

.tool-form-wrapper input[type="submit"], 
.tool-form-wrapper button {
    cursor: pointer;
    background: var(--accent-color);
    color: #0B0F19;
    padding: 0.8rem 2rem;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    transition: all 0.3s ease;
    font-family: var(--font-family);
    box-shadow: 0 4px 15px var(--accent-glow);
}

.tool-form-wrapper button#reverseButton {
    background: var(--surface-hover);
    color: var(--text-primary);
    box-shadow: none;
    border: 1px solid var(--border-color);
    padding: 0.75rem 1rem;
    margin-left: 0.5rem;
}

.tool-form-wrapper input[type="submit"]:hover, 
.tool-form-wrapper button:not(#reverseButton):hover {
    background: #7DD3FC;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px var(--accent-glow);
}

/* CoordConvert Specific Table */
.tool-form-wrapper table.coords {
    background: rgba(255,255,255,0.02);
    border-radius: 8px;
    border: 1px solid var(--border-color);
    padding: 1rem;
}
.tool-form-wrapper table.coords td.coordData input {
    background: rgba(0,0,0,0.5);
    border: 1px dashed var(--border-color);
}

@media (max-width: 768px) {
    .tool-page-container {
        padding: 6rem 5% 3rem;
    }
    .tool-form-wrapper {
        padding: 1.5rem;
    }
    .tool-form-wrapper h1 {
        font-size: 1.8rem;
        margin-bottom: 1rem;
    }
    .tool-form-wrapper p {
        font-size: 0.95rem;
        margin-bottom: 1rem;
    }
    .tool-form-wrapper table td {
        display: block;
        width: 100%;
        text-align: left !important;
        padding: 0.25rem 0;
    }
}