/* ==========================================
   Egzantrik - Modern Web Application Styles
   ========================================== */

/* CSS Variables */
:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --secondary: #ec4899;
    --secondary-dark: #db2777;
    --accent: #06b6d4;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;

    --bg-dark: #0f0f23;
    --bg-darker: #090918;
    --bg-card: rgba(255, 255, 255, 0.05);
    --bg-glass: rgba(255, 255, 255, 0.08);

    --text-primary: #ffffff;
    --text-secondary: rgba(255, 255, 255, 0.7);
    --text-muted: rgba(255, 255, 255, 0.5);

    --border-color: rgba(255, 255, 255, 0.1);
    --shadow-color: rgba(0, 0, 0, 0.3);

    --gradient-1: linear-gradient(135deg, #6366f1 0%, #ec4899 100%);
    --gradient-2: linear-gradient(135deg, #06b6d4 0%, #6366f1 100%);
    --gradient-3: linear-gradient(135deg, #10b981 0%, #06b6d4 100%);

    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Reset & Base */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

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

/* Animated Background */
.animated-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: hidden;
    background: linear-gradient(135deg, var(--bg-darker) 0%, var(--bg-dark) 50%, #1a1a3e 100%);
}

.particle {
    position: absolute;
    width: 400px;
    height: 400px;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.3;
    animation: float 20s infinite ease-in-out;
}

.particle:nth-child(1) {
    background: var(--primary);
    top: -100px;
    left: -100px;
    animation-delay: 0s;
}

.particle:nth-child(2) {
    background: var(--secondary);
    top: 50%;
    right: -150px;
    animation-delay: -5s;
}

.particle:nth-child(3) {
    background: var(--accent);
    bottom: -100px;
    left: 30%;
    animation-delay: -10s;
}

.particle:nth-child(4) {
    background: var(--primary-light);
    top: 30%;
    left: 50%;
    width: 300px;
    height: 300px;
    animation-delay: -15s;
}

.particle:nth-child(5) {
    background: var(--secondary);
    bottom: 20%;
    right: 20%;
    width: 250px;
    height: 250px;
    animation-delay: -7s;
}

@keyframes float {

    0%,
    100% {
        transform: translate(0, 0) scale(1);
    }

    25% {
        transform: translate(50px, -50px) scale(1.1);
    }

    50% {
        transform: translate(-30px, 30px) scale(0.9);
    }

    75% {
        transform: translate(-50px, -30px) scale(1.05);
    }
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 1rem 2rem;
    background: rgba(15, 15, 35, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    transition: var(--transition);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
    font-weight: 700;
    font-size: 1.5rem;
}

.logo-icon {
    font-size: 1.75rem;
    animation: pulse 2s infinite;
}

.logo-img {
    width: 40px;
    height: 40px;
    max-width: 40px;
    max-height: 40px;
    min-width: 40px;
    min-height: 40px;
    border-radius: 8px;
    object-fit: cover;
    animation: pulse 2s infinite;
    flex-shrink: 0;
}

@keyframes pulse {

    0%,
    100% {
        transform: scale(1);
    }

    50% {
        transform: scale(1.1);
    }
}

.logo-text {
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    transition: var(--transition);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--gradient-1);
    transition: var(--transition);
    transform: translateX(-50%);
}

.nav-link:hover,
.nav-link.active {
    color: var(--text-primary);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.mobile-menu-btn span {
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: var(--transition);
}

.mobile-menu {
    display: none;
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    background: rgba(15, 15, 35, 0.98);
    backdrop-filter: blur(20px);
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
    z-index: 999;
}

.mobile-menu.active {
    display: block;
}

.mobile-link {
    display: block;
    color: var(--text-secondary);
    text-decoration: none;
    padding: 1rem;
    font-weight: 500;
    border-radius: 8px;
    transition: var(--transition);
}

.mobile-link:hover {
    background: var(--bg-glass);
    color: var(--text-primary);
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .mobile-menu-btn {
        display: flex;
    }
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 6rem 2rem 4rem;
    position: relative;
}

.hero-content {
    text-align: center;
    max-width: 800px;
    z-index: 1;
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 800;
    margin-bottom: 1.5rem;
    line-height: 1.2;
}

.gradient-text {
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: clamp(1rem, 2vw, 1.25rem);
    color: var(--text-secondary);
    margin-bottom: 2.5rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem 2rem;
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    border-radius: 12px;
    transition: var(--transition);
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: var(--gradient-1);
    color: white;
    box-shadow: 0 4px 20px rgba(99, 102, 241, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(99, 102, 241, 0.5);
}

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

.btn-secondary:hover {
    background: var(--bg-card);
    border-color: var(--primary);
}

.hero-cards {
    position: absolute;
    width: 100%;
    height: 100%;
    pointer-events: none;
    overflow: hidden;
}

.floating-card {
    position: absolute;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    padding: 1.5rem;
    background: var(--bg-glass);
    backdrop-filter: blur(10px);
    border-radius: 16px;
    border: 1px solid var(--border-color);
    animation: floatCard 6s infinite ease-in-out;
}

.card-emoji {
    font-size: 2rem;
}

.card-label {
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.card-1 {
    top: 20%;
    left: 10%;
    animation-delay: 0s;
}

.card-2 {
    top: 30%;
    right: 10%;
    animation-delay: -2s;
}

.card-3 {
    bottom: 25%;
    left: 15%;
    animation-delay: -4s;
}

@keyframes floatCard {

    0%,
    100% {
        transform: translateY(0) rotate(0deg);
    }

    50% {
        transform: translateY(-20px) rotate(5deg);
    }
}

@media (max-width: 768px) {
    .hero-cards {
        display: none;
    }
}

/* Sections */
.section {
    padding: 5rem 2rem;
    max-width: 1400px;
    margin: 0 auto;
}

.section-header {
    text-align: center;
    margin-bottom: 3rem;
}

.section-title {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 700;
    margin-bottom: 1rem;
}

.section-subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto;
}

/* Calculator Section */
.calculator-section {
    padding-top: 8rem;
}

.calculator-tabs {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.calc-tab {
    padding: 0.75rem 1.5rem;
    background: var(--bg-glass);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    color: var(--text-secondary);
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.calc-tab:hover,
.calc-tab.active {
    background: var(--gradient-1);
    color: white;
    border-color: transparent;
}

.calculator-container {
    max-width: 450px;
    margin: 0 auto;
}

.calc-panel {
    display: none;
}

.calc-panel.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.calc-display {
    background: var(--bg-darker);
    border-radius: 16px;
    padding: 1.5rem;
    margin-bottom: 1rem;
    text-align: right;
    border: 1px solid var(--border-color);
}

.calc-expression {
    color: var(--text-muted);
    font-size: 1rem;
    min-height: 1.5rem;
    word-break: break-all;
}

.calc-result {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
    word-break: break-all;
}

.calc-buttons {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.75rem;
}

.calc-buttons.scientific {
    grid-template-columns: repeat(4, 1fr);
}

.calc-btn {
    padding: 1.25rem;
    font-size: 1.25rem;
    font-weight: 600;
    border: none;
    border-radius: 12px;
    cursor: pointer;
    transition: var(--transition);
    background: var(--bg-glass);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.calc-btn:hover {
    transform: scale(1.05);
    background: var(--bg-card);
}

.calc-btn:active {
    transform: scale(0.95);
}

.calc-btn.number {
    background: rgba(255, 255, 255, 0.1);
}

.calc-btn.number:hover {
    background: rgba(255, 255, 255, 0.15);
}

.calc-btn.operator {
    background: var(--primary);
    color: white;
}

.calc-btn.operator:hover {
    background: var(--primary-dark);
}

.calc-btn.function {
    background: var(--accent);
    color: white;
    font-size: 1rem;
}

.calc-btn.function:hover {
    background: #0891b2;
}

.calc-btn.equals {
    background: var(--secondary);
    color: white;
}

.calc-btn.equals:hover {
    background: var(--secondary-dark);
}

.calc-btn.zero {
    grid-column: span 2;
}

/* Converter */
.converter-box,
.bmi-box {
    background: var(--bg-glass);
    border-radius: 20px;
    padding: 2rem;
    border: 1px solid var(--border-color);
}

.converter-box h3,
.bmi-box h3 {
    text-align: center;
    margin-bottom: 1.5rem;
    font-size: 1.25rem;
}

.converter-type {
    margin-bottom: 1.5rem;
}

.converter-type select,
.converter-group select {
    width: 100%;
    padding: 0.875rem;
    background: var(--bg-darker);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    color: var(--text-primary);
    font-size: 1rem;
    cursor: pointer;
}

.converter-inputs {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.converter-group {
    flex: 1;
    min-width: 120px;
}

.converter-group input {
    width: 100%;
    padding: 0.875rem;
    background: var(--bg-darker);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    color: var(--text-primary);
    font-size: 1rem;
    margin-bottom: 0.5rem;
}

.converter-arrow {
    font-size: 1.5rem;
    color: var(--primary);
}

/* BMI Calculator */
.bmi-inputs {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 2rem;
}

.bmi-input-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.bmi-input-group input {
    width: 100%;
    padding: 0.875rem;
    background: var(--bg-darker);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    color: var(--text-primary);
    font-size: 1.25rem;
    text-align: center;
}

.bmi-result {
    text-align: center;
    padding: 2rem;
    background: var(--bg-darker);
    border-radius: 16px;
    margin-bottom: 1.5rem;
}

.bmi-value {
    font-size: 3rem;
    font-weight: 800;
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.bmi-category {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-top: 0.5rem;
}

.bmi-scale {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.5rem;
    text-align: center;
}

.bmi-range {
    padding: 0.75rem 0.5rem;
    border-radius: 8px;
    font-size: 0.75rem;
    font-weight: 600;
}

.bmi-range.underweight {
    background: rgba(6, 182, 212, 0.2);
    color: var(--accent);
}

.bmi-range.normal {
    background: rgba(16, 185, 129, 0.2);
    color: var(--success);
}

.bmi-range.overweight {
    background: rgba(245, 158, 11, 0.2);
    color: var(--warning);
}

.bmi-range.obese {
    background: rgba(239, 68, 68, 0.2);
    color: var(--danger);
}

/* Game Section */
.game-section {
    padding-top: 8rem;
}

.game-container {
    max-width: 500px;
    margin: 0 auto;
    background: var(--bg-glass);
    border-radius: 24px;
    padding: 2rem;
    border: 1px solid var(--border-color);
}

.game-header {
    display: flex;
    justify-content: space-around;
    margin-bottom: 1.5rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.game-stat {
    text-align: center;
}

.stat-label {
    display: block;
    color: var(--text-muted);
    font-size: 0.875rem;
    margin-bottom: 0.25rem;
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.game-board {
    display: grid;
    grid-template-columns: repeat(10, 1fr);
    gap: 4px;
    padding: 10px;
    background: var(--bg-darker);
    border-radius: 16px;
    margin-bottom: 1.5rem;
    aspect-ratio: 1;
}

.block {
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s ease;
    position: relative;
}

.block:hover {
    transform: scale(1.1);
    z-index: 10;
    box-shadow: 0 0 15px currentColor;
}

.block.selected {
    animation: pulse-block 0.5s infinite;
}

@keyframes pulse-block {

    0%,
    100% {
        transform: scale(1);
    }

    50% {
        transform: scale(1.1);
    }
}

.block.exploding {
    animation: explode 0.3s ease forwards;
}

@keyframes explode {
    0% {
        transform: scale(1);
        opacity: 1;
    }

    50% {
        transform: scale(1.3);
    }

    100% {
        transform: scale(0);
        opacity: 0;
    }
}

.game-controls {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-bottom: 1.5rem;
}

.game-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.875rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    background: var(--gradient-1);
    color: white;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    transition: var(--transition);
}

.game-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 20px rgba(99, 102, 241, 0.4);
}

.game-btn.secondary {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
}

.game-btn.secondary:hover {
    background: var(--bg-glass);
}

.game-instructions {
    background: var(--bg-darker);
    border-radius: 12px;
    padding: 1.5rem;
}

.game-instructions h4 {
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.game-instructions ul {
    list-style: none;
}

.game-instructions li {
    padding: 0.5rem 0;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Science Section */
.science-section {
    padding-top: 8rem;
}

.science-categories {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.science-tab {
    padding: 0.75rem 1.5rem;
    background: var(--bg-glass);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    color: var(--text-secondary);
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.science-tab:hover,
.science-tab.active {
    background: var(--gradient-2);
    color: white;
    border-color: transparent;
}

.science-panel {
    display: none;
}

.science-panel.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

.science-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.science-card {
    background: var(--bg-glass);
    border-radius: 20px;
    padding: 2rem;
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.science-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary);
    box-shadow: 0 20px 40px rgba(99, 102, 241, 0.15);
}

.card-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    display: block;
}

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

.science-card p {
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 1rem;
}

.card-fact {
    padding: 1rem;
    background: var(--bg-darker);
    border-radius: 10px;
    font-size: 0.875rem;
    color: var(--accent);
    border-left: 3px solid var(--accent);
}

/* Footer */
.footer {
    background: var(--bg-darker);
    border-top: 1px solid var(--border-color);
    padding: 3rem 2rem;
    margin-top: 4rem;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    text-align: center;
}

.footer-brand {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.footer-brand .logo-icon {
    font-size: 1.5rem;
}

.footer-brand .logo-text {
    font-size: 1.5rem;
    font-weight: 700;
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.footer-text {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.footer-links a {
    color: var(--text-muted);
    text-decoration: none;
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--text-primary);
}

.copyright {
    color: var(--text-muted);
    font-size: 0.875rem;
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: var(--bg-darker);
}

::-webkit-scrollbar-thumb {
    background: var(--primary);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-dark);
}

/* Responsive Design */
@media (max-width: 768px) {
    .section {
        padding: 4rem 1rem;
    }

    .calculator-section,
    .game-section,
    .science-section {
        padding-top: 6rem;
    }

    .hero {
        padding: 5rem 1rem 3rem;
    }

    .bmi-inputs {
        grid-template-columns: 1fr;
    }

    .converter-inputs {
        flex-direction: column;
    }

    .converter-arrow {
        transform: rotate(90deg);
    }

    .science-grid {
        grid-template-columns: 1fr;
    }

    .game-board {
        grid-template-columns: repeat(8, 1fr);
    }
}

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

/* Selection color */
::selection {
    background: var(--primary);
    color: white;
}