/* ======================= General Styles & Variables ======================= */
        :root {
            --primary-blue: #007bff;        /* Main interactive blue */
            --primary-blue-dark: #0056b3;   /* Darker blue for hover states */
            --light-blue-bg: #e7f3ff;     /* Very light blue for subtle backgrounds */
            --accent-blue: #3399ff;       /* A slightly lighter, brighter blue for highlights */
            --text-dark: #212529;         /* Main text color */
            --text-light: #6c757d;        /* Lighter text for subheadlines, descriptions */
            --bg-white: #ffffff;
            --bg-light-gray: #f8f9fa;     /* Light gray for alternating sections */
            --border-color: #dee2e6;      /* Standard border color */
            --card-shadow: 0 5px 15px rgba(0, 0, 0, 0.07); /* Softer, slightly larger shadow */
            --card-hover-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
            --border-radius: 8px;         /* Consistent rounded corners */
            --font-primary: 'Roboto', sans-serif;
            --font-headings: 'Montserrat', sans-serif;
            --transition-speed: 0.3s;     /* Standard transition speed */
        }

        /* Dark Mode Variables */
        html.dark {
            --primary-blue: #4dabf7;        /* Lighter blue for dark mode */
            --primary-blue-dark: #228be6;   /* Darker blue for hover states */
            --light-blue-bg: #1e3a5f;     /* Dark blue background */
            --accent-blue: #74c0fc;       /* Lighter accent blue */
            --text-dark: #f8f9fa;         /* Light text for dark mode */
            --text-light: #adb5bd;        /* Lighter gray text */
            --bg-white: #212529;         /* Dark background */
            --bg-light-gray: #343a40;    /* Darker gray */
            --border-color: #495057;     /* Dark border */
            --card-shadow: 0 5px 15px rgba(0, 0, 0, 0.3); /* Darker shadow */
            --card-hover-shadow: 0 8px 20px rgba(0, 0, 0, 0.4);
        }

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

        html {
            scroll-behavior: smooth;
            transition: background-color var(--transition-speed) ease, color var(--transition-speed) ease;
        }

        body {
            font-family: var(--font-primary);
            color: var(--text-dark);
            line-height: 1.7; /* Slightly increased line-height for readability */
            background-color: var(--bg-white);
            -webkit-font-smoothing: antialiased; /* Smoother fonts on WebKit */
            -moz-osx-font-smoothing: grayscale; /* Smoother fonts on Firefox */
        }

        .container {
            width: 90%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 15px;
        }

        a {
            text-decoration: none;
            color: var(--primary-blue);
            transition: color var(--transition-speed) ease;
        }

        a:hover {
            color: var(--primary-blue-dark);
        }

        h1, h2, h3 {
            font-family: var(--font-headings);
            font-weight: 700;
            margin-bottom: 0.6em; /* Adjusted margin */
        }

        h2 {
            font-size: 2.3rem; /* Slightly larger section titles */
            color: var(--text-dark);
            margin-bottom: 25px;
            padding-bottom: 12px;
            border-bottom: 2px solid var(--light-blue-bg);
            display: flex;
            align-items: center;
            gap: 15px;
            text-align: center;
            justify-content: center;
        }

        h2 i {
            color: var(--accent-blue); /* Using accent blue for section icons */
            font-size: 2.1rem; /* Slightly adjusted icon size */
        }

        p {
            margin-bottom: 1em;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block; /* Prevents bottom space */
        }

        /* ======================= Header ======================= */
        .site-header {
            background-color: var(--bg-white);
            padding: 15px 0;
            border-bottom: 1px solid var(--border-color);
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 2px 5px rgba(0,0,0,0.06); /* Slightly more defined shadow */
        }

        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .logo a {
            font-family: var(--font-headings);
            font-size: 1.9rem; /* Slightly larger logo */
            font-weight: 700; /* Already bold, ensuring it */
            color: var(--text-dark);
        }

        .main-nav ul {
            list-style: none;
            display: flex;
            gap: 30px; /* Increased gap */
        }

        .main-nav a {
            font-weight: 500;
            color: var(--text-light);
            padding: 8px 0; /* Slightly more padding for easier click */
            position: relative;
            transition: color var(--transition-speed) ease;
        }

        .main-nav a.active,
        .main-nav a:hover {
            color: var(--primary-blue);
        }

        .main-nav a::after {
            content: '';
            position: absolute;
            bottom: 0; /* Position underline at the very bottom of padding */
            left: 0;
            width: 0;
            height: 2.5px; /* Slightly thicker underline */
            background-color: var(--primary-blue);
            transition: width var(--transition-speed) ease;
        }

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

        .header-contact .email-link {
            font-size: 0.9rem;
            color: var(--text-light);
            display: flex;
            align-items: center;
            gap: 6px; /* Increased gap */
        }
        .header-contact .email-link i {
            color: var(--primary-blue);
            font-size: 1rem; /* Slightly larger email icon */
        }

        .nav-toggle {
            display: none;
            background: none;
            border: none;
            cursor: pointer;
            padding: 10px;
            z-index: 1001;
        }

        .hamburger {
            display: block;
            width: 28px; /* Slightly larger hamburger */
            height: 3px;
            background-color: var(--text-dark);
            position: relative;
            transition: background-color var(--transition-speed) ease;
        }

        .hamburger::before,
        .hamburger::after {
            content: '';
            position: absolute;
            width: 28px;
            height: 3px;
            background-color: var(--text-dark);
            left: 0;
            transition: transform var(--transition-speed) ease, top var(--transition-speed) ease;
        }

        .hamburger::before {
            top: -9px; /* Adjusted spacing */
        }

        .hamburger::after {
            top: 9px;
        }

        .nav-toggle.active .hamburger {
            background-color: transparent;
        }
        .nav-toggle.active .hamburger::before {
            top: 0;
            transform: rotate(45deg);
        }
        .nav-toggle.active .hamburger::after {
            top: 0;
            transform: rotate(-45deg);
        }

        .theme-toggle {
            background: none;
            border: none;
            cursor: pointer;
            padding: 10px;
            color: var(--text-light);
            font-size: 1.2rem;
            transition: color var(--transition-speed) ease;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .theme-toggle:hover {
            color: var(--primary-blue);
        }

        /* ======================= Hero Section ======================= */
        .hero-section {
            background: linear-gradient(135deg, var(--primary-blue) 0%, var(--accent-blue) 40%, var(--light-blue-bg) 80%, var(--bg-white) 100%); /* Refined gradient */
            padding: 90px 0; /* Increased padding */
            text-align: center;
            color: var(--text-dark);
            overflow: hidden; /* For animations */
        }

        .hero-section h1 {
            font-size: 3rem; /* Larger headline */
            color: var(--bg-white);
            margin-bottom: 25px;
            text-shadow: 1px 1px 4px rgba(0,0,0,0.25);
        }

        .hero-section .subheadline {
            font-size: 1.3rem; /* Larger subheadline */
            color: var(--light-blue-bg); /* Brighter color on the darker part of gradient */
            max-width: 750px; /* Slightly wider */
            margin: 0 auto 35px auto;
        }

        .cta-button {
            background-color: var(--bg-white);
            color: var(--primary-blue);
            padding: 16px 35px; /* Larger CTA */
            font-size: 1.15rem;
            font-weight: 700;
            border-radius: var(--border-radius);
            transition: background-color var(--transition-speed) ease, color var(--transition-speed) ease, transform 0.2s ease, box-shadow var(--transition-speed) ease;
            display: inline-block;
            box-shadow: 0 5px 12px rgba(0,0,0,0.18);
            border: 2px solid transparent;
        }

        .cta-button:hover {
            background-color: var(--primary-blue-dark);
            color: var(--bg-white);
            transform: translateY(-3px) scale(1.03);
            box-shadow: 0 7px 15px rgba(0,0,0,0.22);
        }

        .hero-icons {
            margin-top: 45px;
            display: flex;
            justify-content: center;
            gap: 35px; /* Increased gap */
            flex-wrap: wrap;
        }

        .hero-icons span {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 10px;
            font-size: 0.95rem;
            color: var(--text-dark);
            background-color: rgba(255, 255, 255, 0.8); /* More pronounced background */
            padding: 12px 18px; /* Adjusted padding */
            border-radius: var(--border-radius);
            box-shadow: 0 3px 6px rgba(0,0,0,0.08);
            transition: transform var(--transition-speed) ease, box-shadow var(--transition-speed) ease;
        }
        .hero-icons span:hover {
            transform: translateY(-4px) scale(1.05); /* More pronounced hover */
            box-shadow: 0 5px 10px rgba(0,0,0,0.12);
        }

        .hero-icons span i {
            color: var(--accent-blue);
            font-size: 2rem; /* Larger icons */
        }

        /* ======================= Search Bar Section ======================= */
        .search-section {
            padding: 50px 0; /* Increased padding */
            background-color: var(--bg-white);
        }

        #toolSearchForm {
            display: flex;
            max-width: 750px; /* Slightly wider */
            margin: 0 auto;
            border: 1px solid var(--border-color);
            border-radius: var(--border-radius);
            overflow: hidden;
            box-shadow: 0 3px 10px rgba(0,0,0,0.08); /* More prominent shadow */
        }

        #toolSearchInput {
            flex-grow: 1;
            padding: 18px 22px; /* Increased padding for larger feel */
            font-size: 1.05rem; /* Slightly larger font */
            border: none;
            outline: none;
        }
        #toolSearchInput::placeholder {
            color: var(--text-light);
            opacity: 0.8; /* Make placeholder slightly less prominent */
        }
        #toolSearchInput:focus {
            box-shadow: inset 0 0 0 2px var(--primary-blue); /* Focus indicator */
        }


        #toolSearchForm button {
            background-color: var(--primary-blue);
            color: var(--bg-white);
            border: none;
            padding: 0 28px; /* Increased padding */
            cursor: pointer;
            font-size: 1.15rem; /* Matched input font size */
            transition: background-color var(--transition-speed) ease;
        }

        #toolSearchForm button:hover {
            background-color: var(--primary-blue-dark);
        }
        #no-results-message-container {
            margin-top: 15px;
        }
        #no-results-message {
            text-align: center;
            padding: 20px;
            font-size: 1.1rem;
            color: var(--text-light);
            background-color: var(--light-blue-bg);
            border-radius: var(--border-radius);
            border: 1px dashed var(--border-color);
        }


        /* ======================= Tool Categories ======================= */
        .tool-category {
            padding: 70px 0; /* Increased padding */
        }
        .tool-category:nth-child(even) {
            background-color: var(--light-blue-bg);
        }
        .tool-category:nth-child(odd) {
            background-color: var(--bg-white);
        }

        .category-subheading {
            font-size: 1.15rem; /* Slightly larger */
            color: var(--text-light);
            text-align: center;
            margin-bottom: 45px;
            max-width: 800px;
            margin-left: auto;
            margin-right: auto;
            margin-top: -15px;
        }

        .tool-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); /* Min card width */
            gap: 35px; /* Increased gap */
        }

        .tool-card {
            background-color: var(--bg-white);
            border-radius: var(--border-radius);
            padding: 28px; /* Increased padding */
            text-align: center;
            box-shadow: var(--card-shadow);
            transition: transform var(--transition-speed) ease, box-shadow var(--transition-speed) ease, border-color var(--transition-speed) ease;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
            border: 1px solid var(--border-color);
        }

        .tool-card.hidden {
            display: none;
        }

        .tool-card:hover {
            transform: translateY(-6px) scale(1.02); /* More pronounced lift */
            box-shadow: var(--card-hover-shadow);
            border-color: var(--primary-blue);
        }

        .tool-icon {
            font-size: 2.8rem; /* Larger tool icons */
            color: var(--primary-blue);
            margin-bottom: 18px;
            transition: transform var(--transition-speed) ease; /* Icon animation on hover */
        }
        .tool-card:hover .tool-icon {
            transform: scale(1.1) rotate(-5deg); /* Slight scale and rotate on card hover */
        }
        .tool-icon .fa-stack {
            font-size: 1em;
        }


        .tool-card h3 {
            font-size: 1.35rem; /* Slightly larger card title */
            color: var(--text-dark);
            margin-bottom: 12px;
            min-height: 2.8em; /* Ensure space for two lines if needed */
            display: flex; /* To center vertically if only one line */
            align-items: center;
            justify-content: center;
        }

        .tool-card p {
            font-size: 0.9rem;
            color: var(--text-light);
            margin-bottom: 22px;
            flex-grow: 1;
            min-height: 45px;
        }

        .tool-button {
            background-color: var(--primary-blue);
            color: var(--bg-white);
            padding: 12px 24px; /* Increased padding */
            border-radius: var(--border-radius);
            font-weight: 500;
            display: inline-block;
            transition: background-color var(--transition-speed) ease, transform 0.2s ease;
            border: 1px solid var(--primary-blue);
            text-transform: uppercase;
            font-size: 0.88rem; /* Slightly adjusted */
            letter-spacing: 0.6px;
        }

        .tool-button:hover {
            background-color: var(--primary-blue-dark);
            border-color: var(--primary-blue-dark);
            color: var(--bg-white);
            transform: translateY(-2px) scale(1.02); /* Slight lift and scale */
        }

        /* ======================= Footer ======================= */
        .site-footer {
            background-color: var(--text-dark);
            color: #c0c8d1; /* Slightly lighter footer text */
            padding: 60px 0 0; /* Increased padding */
        }

        .footer-container {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); /* Min col width */
            gap: 35px; /* Increased gap */
            padding-bottom: 45px;
        }

        .footer-about .logo {
            font-family: var(--font-headings);
            font-size: 1.9rem; /* Match header logo */
            font-weight: 700;
            color: var(--bg-white);
            margin-bottom: 12px;
        }

        .footer-about p, .footer-contact p {
            font-size: 0.92rem; /* Slightly larger */
            margin-bottom: 12px;
            line-height: 1.8; /* Increased for footer readability */
        }
        .website-builder {
            font-size: 0.82rem;
            color: #9098a1; /* Lighter gray */
            margin-top: 18px;
        }

        .footer-contact h4, .footer-links h4 {
            color: var(--bg-white);
            font-size: 1.25rem; /* Slightly larger footer headings */
            margin-bottom: 18px;
            font-family: var(--font-headings);
        }

        .footer-contact a {
            color: #c0c8d1;
            transition: color var(--transition-speed) ease;
        }
        .footer-contact a:hover {
            color: var(--bg-white);
        }
        .footer-contact .social-media {
            margin-top: 18px;
            margin-bottom: 12px;
        }
        .footer-contact .social-media a {
            color: var(--bg-white);
            font-size: 1.6rem; /* Larger social icons */
            margin-right: 18px;
            transition: color var(--transition-speed) ease, transform 0.2s ease;
            display: inline-block;
        }
        .footer-contact .social-media a:hover {
            color: var(--accent-blue); /* Use accent blue for hover */
            transform: scale(1.15) translateY(-2px); /* More pronounced hover */
        }
        .footer-contact .social-media .telegram-link {
            font-size: 0.92rem;
            vertical-align: middle;
        }
        .footer-contact .social-media .telegram-link i {
             font-size: 1.25rem;
             margin-right: 6px;
        }

        .footer-contact .telegram-desc {
            font-size: 0.82rem;
            color: #9098a1;
            line-height: 1.5;
        }


        .footer-links ul {
            list-style: none;
        }

        .footer-links li {
            margin-bottom: 10px; /* Increased spacing */
        }

        .footer-links a {
            color: #c0c8d1;
            transition: color var(--transition-speed) ease, padding-left var(--transition-speed) ease;
            font-size: 0.92rem;
        }

        .footer-links a:hover {
            color: var(--bg-white);
            padding-left: 8px; /* More indent on hover */
        }
        .footer-links a::before { /* Optional: add a small bullet or dash */
            content: "• ";
            color: var(--primary-blue);
            margin-right: 5px;
            opacity: 0.6;
        }
        .footer-links a:hover::before {
            opacity: 1;
        }


        .footer-bottom {
            text-align: center;
            padding: 25px 0; /* Increased padding */
            border-top: 1px solid #404850; /* Slightly adjusted border color */
            font-size: 0.92rem;
        }

        /* Animation Helper Classes */
        .anim-slide-in-up {
            opacity: 0;
            transform: translateY(30px); /* Start further down */
            transition: opacity 0.6s ease-out, transform 0.6s ease-out; /* Smoother, longer transition */
        }
        .anim-slide-in-up.visible {
            opacity: 1;
            transform: translateY(0);
        }
        .anim-slide-in-up.delay-1 { transition-delay: 0.1s; }
        .anim-slide-in-up.delay-2 { transition-delay: 0.2s; }
        .anim-slide-in-up.delay-3 { transition-delay: 0.3s; }
        .anim-slide-in-up.delay-4 { transition-delay: 0.4s; }
        .anim-slide-in-up.delay-5 { transition-delay: 0.5s; }


        /* ======================= Responsive Design ======================= */
        @media (max-width: 992px) {
            .hero-section h1 {
                font-size: 2.6rem;
            }
            .hero-section .subheadline {
                font-size: 1.2rem;
            }
            .tool-grid {
                grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
            }
            h2 {
                font-size: 2.1rem;
            }
        }

        @media (max-width: 768px) {
            .header-container {
                position: relative;
            }
            .main-nav {
                position: fixed; /* Fixed position for full screen overlay feel */
                top: 0; /* Start from top of viewport */
                left: -100%; /* Start off-screen */
                width: 80%; /* Not full width for an overlay effect */
                max-width: 300px; /* Max width for the nav panel */
                height: 100vh; /* Full viewport height */
                background-color: var(--bg-white);
                box-shadow: 5px 0 15px rgba(0,0,0,0.15); /* Shadow on the panel */
                overflow-y: auto;
                transition: left 0.4s ease-in-out; /* Smoother transition for slide-in */
                padding-top: 70px; /* Space for a close button or logo */
            }
            .main-nav.active {
                left: 0; /* Slide in from left */
            }
            .nav-overlay { /* Optional overlay for behind the nav */
                position: fixed;
                top: 0;
                left: 0;
                width: 100%;
                height: 100%;
                background-color: rgba(0,0,0,0.5);
                z-index: 999; /* Below header, above content */
                opacity: 0;
                visibility: hidden;
                transition: opacity var(--transition-speed) ease, visibility var(--transition-speed) ease;
            }
            .nav-overlay.active {
                opacity: 1;
                visibility: visible;
            }


            .main-nav ul {
                flex-direction: column;
                padding: 20px 0; /* Padding inside the nav panel */
                gap: 0;
            }
            .main-nav li {
                width: 100%;
            }
            .main-nav a {
                display: block;
                padding: 15px 25px; /* Generous padding for tap targets */
                text-align: left;
                width: 100%;
                border-bottom: 1px solid var(--light-blue-bg);
                font-size: 1.05rem; /* Larger font for mobile nav */
            }
            .main-nav li:last-child a {
                border-bottom: none;
            }
            .main-nav a::after {
                display: none;
            }

            .nav-toggle {
                display: block;
                order: 1; /* Ensure it's on the right */
                position: relative; /* To ensure it's clickable */
                z-index: 1002; /* Above overlay and nav when nav is closed */
            }
            .nav-toggle.active { /* Style when nav is open */
                 /* Position inside nav panel, or keep in header */
            }

            .header-contact {
                display: none;
            }
            .logo a {
                font-size: 1.7rem;
            }

            .hero-section {
                padding: 70px 0;
            }
            .hero-section h1 {
                font-size: 2.2rem;
            }
            .hero-icons {
                gap: 18px;
            }
            .hero-icons span {
                font-size: 0.9rem;
                padding: 10px 15px;
            }
            .hero-icons span i {
                font-size: 1.6rem;
            }

            .search-section {
                padding: 40px 0;
            }
            #toolSearchInput, #toolSearchForm button {
                font-size: 1rem;
                padding: 14px 18px;
            }
            #toolSearchForm button {
                padding: 0 22px;
            }

            h2 {
                font-size: 1.9rem;
                justify-content: flex-start;
                text-align: left;
            }
             h2 i { font-size: 1.9rem; }
            .category-subheading {
                font-size: 1.05rem;
                margin-bottom: 35px;
                text-align: left;
            }
            .tool-grid {
                grid-template-columns: 1fr;
                gap: 25px;
            }
             .tool-card {
                padding: 22px;
            }
            .tool-card h3 {
                min-height: auto;
            }


            .footer-container {
                grid-template-columns: 1fr;
                text-align: left;
            }
            .footer-about .logo, .footer-contact h4, .footer-links h4 {
                text-align: left;
            }
            .footer-contact .social-media {
                justify-content: flex-start;
            }
             .footer-contact .social-media a {
                margin-right: 18px;
                margin-left: 0;
            }
        }

        @media (max-width: 480px) {
            .hero-section h1 {
                font-size: 2rem;
            }
            .hero-section .subheadline {
                font-size: 1.05rem;
            }
            .cta-button {
                padding: 14px 28px;
                font-size: 1.05rem;
            }
            .hero-icons {
                gap: 12px;
            }
            .hero-icons span {
                 flex-basis: calc(50% - 12px);
                 text-align: center;
            }

            #toolSearchForm {
                flex-direction: column;
                border-radius: 0;
                box-shadow: none;
                border: none;
            }
            #toolSearchInput {
                border-radius: var(--border-radius);
                border: 1px solid var(--border-color);
                margin-bottom: 12px;
            }
            #toolSearchForm button {
                border-radius: var(--border-radius);
            }
             .tool-grid {
                gap: 20px; /* Slightly less gap on very small screens */
            }
            .tool-card {
                padding: 20px; /* Adjust card padding */
            }
            h2 { font-size: 1.7rem; }
            h2 i { font-size: 1.7rem; }
        }
    </style>

/* ======================= Tool Pages ======================= */
.tool-interface {
    max-width: 800px;
    margin: 0 auto;
    padding: 40px 0;
}

.tool-interface textarea {
    width: 100%;
    padding: 20px;
    font-size: 1rem;
    font-family: var(--font-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    resize: vertical;
    min-height: 200px;
    margin-bottom: 30px;
    outline: none;
}

.tool-interface textarea:focus {
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 2px rgba(0, 123, 255, 0.25);
}

.results {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-top: 30px;
}

.result-item {
    background-color: var(--bg-white);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 20px;
    text-align: center;
    box-shadow: var(--card-shadow);
}

.result-item h3 {
    font-size: 1.1rem;
    color: var(--text-dark);
    margin-bottom: 10px;
}

.result-item p {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-blue);
    margin: 0;
}

/* For text case converter */
.case-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    margin-bottom: 30px;
}

.case-button {
    background-color: var(--primary-blue);
    color: var(--bg-white);
    border: none;
    padding: 12px 20px;
    border-radius: var(--border-radius);
    font-size: 1rem;
    cursor: pointer;
    transition: background-color var(--transition-speed) ease;
}

.case-button:hover {
    background-color: var(--primary-blue-dark);
}

.output-section {
    margin-top: 30px;
}

.output-section textarea {
    margin-bottom: 15px;
}

.copy-button {
    background-color: var(--accent-blue);
    color: var(--bg-white);
    border: none;
    padding: 10px 15px;
    border-radius: var(--border-radius);
    font-size: 0.9rem;
    cursor: pointer;
    transition: background-color var(--transition-speed) ease;
}

.copy-button:hover {
    background-color: var(--primary-blue-dark);
}

/* For percentage calculator */
.calc-inputs {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 30px;
}

.calc-input {
    display: flex;
    flex-direction: column;
}

.calc-input label {
    font-weight: 500;
    margin-bottom: 8px;
}

.calc-input input {
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 1rem;
    outline: none;
}

.calc-input input:focus {
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 2px rgba(0, 123, 255, 0.25);
}

.calc-result {
    background-color: var(--light-blue-bg);
    padding: 20px;
    border-radius: var(--border-radius);
    text-align: center;
    margin-top: 30px;
}

.calc-result h3 {
    margin-bottom: 10px;
}

/* For chat and OCR tools */
.recent-tools-section {
    padding: 40px 0;
    background-color: var(--bg-light-gray);
}

.recent-tools-section h2 {
    text-align: center;
    margin-bottom: 30px;
    font-size: 2rem;
    color: var(--text-dark);
}

.recent-tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    max-width: 1000px;
    margin: 0 auto;
}

.recent-tool-card {
    background-color: var(--bg-white);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 20px;
    text-align: center;
    box-shadow: var(--card-shadow);
    transition: transform var(--transition-speed) ease, box-shadow var(--transition-speed) ease;
}

.recent-tool-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--card-hover-shadow);
}

.recent-tool-card .tool-icon {
    font-size: 2rem;
    color: var(--primary-blue);
    margin-bottom: 15px;
}

/* For image converter */
.upload-area {
    border: 2px dashed var(--border-color);
    border-radius: var(--border-radius);
    padding: 40px 20px;
    text-align: center;
    background-color: var(--light-blue-bg);
    transition: border-color var(--transition-speed) ease, background-color var(--transition-speed) ease;
    cursor: pointer;
    margin-bottom: 30px;
}

.upload-area:hover,
.upload-area.dragover {
    border-color: var(--primary-blue);
    background-color: rgba(0, 123, 255, 0.05);
}

.upload-area i {
    font-size: 3rem;
    color: var(--primary-blue);
    margin-bottom: 15px;
}

.upload-area p {
    font-size: 1.1rem;
    color: var(--text-light);
    margin: 0;
}

.converter-workspace {
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: 30px;
    margin-top: 30px;
}

.preview-section {
    background-color: var(--bg-white);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 20px;
    box-shadow: var(--card-shadow);
}

.preview-section h3 {
    margin-bottom: 15px;
    color: var(--text-dark);
}

.image-preview {
    max-width: 100%;
    max-height: 300px;
    border-radius: var(--border-radius);
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.controls-panel {
    background-color: var(--bg-white);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 20px;
    box-shadow: var(--card-shadow);
}

.controls-panel h3 {
    margin-bottom: 20px;
    color: var(--text-dark);
}

.control-group {
    margin-bottom: 20px;
}

.control-group label {
    display: block;
    font-weight: 500;
    margin-bottom: 8px;
    color: var(--text-dark);
}

.control-group select,
.control-group input[type="number"] {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 1rem;
    outline: none;
}

.control-group select:focus,
.control-group input[type="number"]:focus {
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 2px rgba(0, 123, 255, 0.25);
}

.convert-button {
    background-color: var(--primary-blue);
    color: var(--bg-white);
    border: none;
    padding: 12px 24px;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: background-color var(--transition-speed) ease;
    width: 100%;
}

.convert-button:hover {
    background-color: var(--primary-blue-dark);
}

.convert-button:disabled {
    background-color: var(--text-light);
    cursor: not-allowed;
}

@media (max-width: 768px) {
    .converter-workspace {
        grid-template-columns: 1fr;
        gap: 20px;
    }
}

/* Additional styles for image converter */
.loading {
    text-align: center;
    padding: 20px;
    color: var(--text-light);
    font-size: 1.1rem;
}

.loading i {
    margin-right: 10px;
}

.error-message {
    background-color: #fee;
    border: 1px solid #fcc;
    border-radius: var(--border-radius);
    padding: 15px;
    color: #c33;
    text-align: center;
    margin-top: 20px;
}

.image-info {
    margin-top: 10px;
    font-size: 0.9rem;
    color: var(--text-light);
    text-align: center;
}

.range-hints {
    display: flex;
    justify-content: space-between;
    margin-top: 5px;
    font-size: 0.8rem;
    color: var(--text-light);
}

.recent-tool-card h3 {
    font-size: 1.1rem;
    color: var(--text-dark);
    margin-bottom: 10px;
}

.recent-tool-card .tool-button {
    display: inline-block;
    background-color: var(--primary-blue);
    color: var(--bg-white);
    padding: 8px 16px;
    border-radius: var(--border-radius);
    text-decoration: none;
    font-weight: 500;
    transition: background-color var(--transition-speed) ease;
}

.recent-tool-card .tool-button:hover {
    background-color: var(--primary-blue-dark);
}
.chat-container {
    max-width: 800px;
    margin: 0 auto;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    overflow: hidden;
    background-color: var(--bg-white);
    box-shadow: var(--card-shadow);
}

.chat-messages {
    max-height: 500px;
    overflow-y: auto;
    padding: 20px;
}

.message {
    display: flex;
    margin-bottom: 20px;
    align-items: flex-start;
}

.message-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 15px;
    font-size: 1.2rem;
}

.message.ai-message .message-avatar {
    background-color: var(--primary-blue);
    color: var(--bg-white);
}

.message.user-message .message-avatar {
    background-color: var(--accent-blue);
    color: var(--bg-white);
}

.message-content p {
    margin: 0;
    padding: 12px 16px;
    border-radius: 18px;
    max-width: 600px;
    word-wrap: break-word;
}

.message.ai-message .message-content p {
    background-color: var(--light-blue-bg);
    color: var(--text-dark);
}

.message.user-message .message-content p {
    background-color: var(--primary-blue);
    color: var(--bg-white);
    margin-left: auto;
}

.chat-input-container {
    border-top: 1px solid var(--border-color);
    padding: 20px;
    background-color: var(--bg-light-gray);
}

.chat-input-wrapper {
    display: flex;
    align-items: flex-end;
    gap: 10px;
}

.chat-input-wrapper textarea {
    flex: 1;
    padding: 12px 16px;
    border: 1px solid var(--border-color);
    border-radius: 25px;
    resize: none;
    outline: none;
    font-family: var(--font-primary);
    font-size: 1rem;
    max-height: 120px;
    overflow-y: auto;
}

.chat-input-wrapper textarea:focus {
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 2px rgba(0, 123, 255, 0.25);
}

.send-button {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background-color: var(--primary-blue);
    color: var(--bg-white);
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    transition: background-color var(--transition-speed) ease;
}

.send-button:hover {
    background-color: var(--primary-blue-dark);
}

.send-button:disabled {
    background-color: var(--text-light);
    cursor: not-allowed;
}

/* OCR styles */
.ocr-preview {
    text-align: center;
    margin-bottom: 30px;
}

.ocr-preview img {
    max-width: 100%;
    max-height: 400px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    margin-bottom: 20px;
}

.ocr-result {
    margin-top: 30px;
}

.ocr-result textarea {
    width: 100%;
    padding: 20px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    font-family: var(--font-primary);
    font-size: 1rem;
    line-height: 1.6;
    resize: vertical;
    outline: none;
}

.ocr-result textarea:focus {
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 2px rgba(0, 123, 255, 0.25);
}