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

:root {
    --bg: #f5f5f7;
    --card: rgba(255,255,255,0.72);
    --card-solid: #ffffff;
    --text: #111111;
    --muted: #6e6e73;
    --border: rgba(0,0,0,0.08);
    --blue: #007aff;
    --purple: #5856d6;
    --danger: #ff3b30;
    --shadow: 0 20px 60px rgba(0,0,0,0.08);
}

body.dark {
    --bg: #090a0e;
    --card: rgba(28,29,35,0.76);
    --card-solid: #1c1d23;
    --text: #f5f5f7;
    --muted: #a1a1aa;
    --border: rgba(255,255,255,0.10);
    --shadow: 0 20px 60px rgba(0,0,0,0.35);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family:
        -apple-system,
        BlinkMacSystemFont,
        "SF Pro Display",
        "SF Pro Text",
        Inter,
        Arial,
        sans-serif;

    background:
        radial-gradient(
            circle at 10% 0%,
            rgba(0,122,255,0.12),
            transparent 30%
        ),
        radial-gradient(
            circle at 90% 5%,
            rgba(88,86,214,0.12),
            transparent 30%
        ),
        var(--bg);

    color: var(--text);
    min-height: 100vh;
    transition: background .3s, color .3s;
}

a {
    text-decoration: none;
    color: inherit;
}

button {
    font-family: inherit;
}

.container {
    width: min(1100px, 92%);
    margin: auto;
}


/* ================= NAVBAR ================= */

.navbar {
    position: sticky;
    top: 12px;
    z-index: 1000;

    width: min(1100px, 94%);
    margin: 12px auto;

    padding: 11px 16px;

    display: flex;
    align-items: center;

    border: 1px solid var(--border);
    border-radius: 22px;

    background: var(--card);

    backdrop-filter: blur(28px);
    -webkit-backdrop-filter: blur(28px);

    box-shadow: var(--shadow);
}

.logo {
    font-size: 20px;
    font-weight: 800;
    letter-spacing: -0.7px;
}

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

.navbar nav {
    display: flex;
    gap: 22px;
    margin-left: auto;
}

.navbar nav a {
    color: var(--muted);
    font-size: 14px;
    transition: .2s;
}

.navbar nav a:hover {
    color: var(--blue);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-left: 18px;
}

.icon-btn,
.menu-btn {
    width: 38px;
    height: 38px;

    border: 0;
    border-radius: 50%;

    background: rgba(127,127,127,.10);
    color: var(--text);

    cursor: pointer;
}

.menu-btn {
    display: none;
    font-size: 18px;
}


/* ================= PAGES ================= */

.page {
    display: none;
}

.page.active {
    display: block;
}


/* ================= HERO ================= */

.hero {
    width: min(900px, 92%);
    margin: auto;

    text-align: center;

    padding: 95px 0 45px;
}

.badge {
    display: inline-block;

    padding: 8px 14px;

    border-radius: 30px;

    background: rgba(0,122,255,.10);

    color: var(--blue);

    font-size: 13px;
    font-weight: 600;

    margin-bottom: 20px;
}

.hero h1 {
    font-size: clamp(44px, 7vw, 76px);

    line-height: .98;

    letter-spacing: -4px;

    font-weight: 800;
}

.hero h1 span {
    background:
        linear-gradient(
            90deg,
            #007aff,
            #5856d6,
            #af52de
        );

    -webkit-background-clip: text;
    background-clip: text;

    color: transparent;
}

.hero p {
    max-width: 650px;

    margin: 25px auto 0;

    color: var(--muted);

    font-size: 17px;

    line-height: 1.65;
}


/* ================= TOOL ================= */

.tool-section {
    width: min(850px, 92%);
    margin: auto;
}

.tool-card {
    padding: 18px;

    border: 1px solid var(--border);
    border-radius: 30px;

    background: var(--card);

    backdrop-filter: blur(30px);
    -webkit-backdrop-filter: blur(30px);

    box-shadow: var(--shadow);
}

.drop-zone {
    min-height: 285px;

    display: flex;
    justify-content: center;
    align-items: center;

    text-align: center;

    border: 2px dashed rgba(0,122,255,.28);

    border-radius: 23px;

    cursor: pointer;

    transition: .25s;
}

.drop-zone:hover,
.drop-zone.drag {
    border-color: var(--blue);
    background: rgba(0,122,255,.05);
}

.upload-icon {
    width: 65px;
    height: 65px;

    display: flex;
    align-items: center;
    justify-content: center;

    margin: 0 auto 15px;

    border-radius: 20px;

    background: rgba(0,122,255,.10);

    color: var(--blue);

    font-size: 35px;
    font-weight: 300;
}

.upload-content h2 {
    font-size: 23px;
    margin-bottom: 7px;
}

.upload-content p {
    color: var(--muted);
    font-size: 14px;
}

.choose-btn {
    margin-top: 17px;

    border: 0;
    border-radius: 14px;

    padding: 12px 18px;

    background: var(--text);
    color: var(--bg);

    font-size: 14px;
    font-weight: 650;

    cursor: pointer;

    transition: .2s;
}

.choose-btn:hover {
    transform: translateY(-2px);
}

#fileInput {
    display: none;
}


/* FILE LIST */

.file-list {
    margin-top: 15px;
}

.file-item {
    display: flex;
    align-items: center;
    gap: 12px;

    padding: 10px;

    margin-bottom: 7px;

    border-radius: 15px;

    background: rgba(127,127,127,.08);
}

.file-item img {
    width: 48px;
    height: 48px;

    object-fit: cover;

    border-radius: 10px;
}

.file-name {
    flex: 1;

    overflow: hidden;

    text-overflow: ellipsis;
    white-space: nowrap;

    font-size: 14px;
}

.remove-btn {
    border: 0;
    background: transparent;

    color: var(--danger);

    cursor: pointer;

    font-size: 20px;
}


/* CONVERT BUTTON */

.convert-btn {
    width: 100%;

    margin-top: 14px;

    padding: 15px;

    border: 0;
    border-radius: 16px;

    background:
        linear-gradient(
            135deg,
            var(--blue),
            var(--purple)
        );

    color: white;

    font-size: 15px;
    font-weight: 700;

    cursor: pointer;

    transition: .2s;
}

.convert-btn:hover {
    transform: translateY(-2px);
}

.convert-btn:disabled {
    opacity: .35;
    cursor: not-allowed;
    transform: none;
}


/* ================= ADS ================= */

.ad-box {
    width: min(850px, 92%);
    min-height: 90px;

    margin: 30px auto;

    display: flex;
    align-items: center;
    justify-content: center;

    border: 1px dashed var(--border);
    border-radius: 18px;

    color: var(--muted);

    font-size: 11px;
}


/* ================= SECTIONS ================= */

.section {
    padding: 75px 0;
}

.section-title {
    text-align: center;

    font-size: 40px;

    letter-spacing: -1.5px;

    margin-bottom: 10px;
}

.section-description {
    max-width: 650px;

    margin: 0 auto 38px;

    text-align: center;

    color: var(--muted);

    line-height: 1.6;
}


/* FEATURES */

.feature-grid {
    display: grid;

    grid-template-columns:
        repeat(3, 1fr);

    gap: 18px;
}

.feature-card {
    padding: 28px;

    border: 1px solid var(--border);
    border-radius: 24px;

    background: var(--card);

    box-shadow: 0 10px 35px rgba(0,0,0,.035);
}

.feature-icon {
    font-size: 30px;

    margin-bottom: 15px;
}

.feature-card h3 {
    margin-bottom: 8px;
}

.feature-card p {
    color: var(--muted);

    font-size: 14px;

    line-height: 1.6;
}


/* STEPS */

.steps {
    display: grid;

    grid-template-columns:
        repeat(3, 1fr);

    gap: 18px;
}

.step {
    padding: 27px;

    border: 1px solid var(--border);
    border-radius: 24px;

    background: var(--card);
}

.step strong {
    color: var(--blue);

    font-size: 13px;
}

.step h3 {
    margin: 10px 0 7px;
}

.step p {
    color: var(--muted);

    font-size: 14px;
}


/* ================= CONTENT ================= */

.content-card {
    width: min(850px, 92%);

    margin: 75px auto;

    padding: 42px;

    border: 1px solid var(--border);
    border-radius: 30px;

    background: var(--card);

    box-shadow: var(--shadow);
}

.content-card h1 {
    font-size: 45px;

    letter-spacing: -2px;

    margin-bottom: 25px;
}

.content-card h2 {
    margin: 30px 0 10px;
}

.content-card p {
    color: var(--muted);

    line-height: 1.8;

    margin-bottom: 15px;
}


/* CONTACT */

.contact-box {
    padding: 20px;

    margin: 25px 0;

    border-radius: 18px;

    background: rgba(127,127,127,.08);
}

.contact-box span {
    display: block;

    color: var(--muted);

    font-size: 12px;

    margin-bottom: 6px;
}

.contact-box a {
    color: var(--blue);

    font-weight: 600;
}


/* ================= BLOG ================= */

.blog-grid {
    display: grid;

    grid-template-columns:
        repeat(3, 1fr);

    gap: 18px;

    padding-bottom: 80px;
}

.blog-card {
    padding: 25px;

    border: 1px solid var(--border);
    border-radius: 24px;

    background: var(--card);

    transition: .2s;
}

.blog-card:hover {
    transform: translateY(-4px);

    box-shadow: var(--shadow);
}

.blog-number {
    color: var(--blue);

    font-size: 12px;
    font-weight: 700;

    margin-bottom: 15px;
}

.blog-card h2 {
    font-size: 20px;

    letter-spacing: -.5px;

    margin-bottom: 10px;
}

.blog-card p {
    color: var(--muted);

    font-size: 14px;

    line-height: 1.6;
}


/* ================= FOOTER ================= */

footer {
    border-top: 1px solid var(--border);

    padding: 40px 0;

    margin-top: 30px;
}

.footer-content {
    display: flex;

    justify-content: space-between;

    gap: 30px;

    flex-wrap: wrap;
}

.footer-content p {
    color: var(--muted);

    margin: 10px 0;

    font-size: 13px;
}

.footer-content small {
    color: var(--muted);

    font-size: 12px;
}

.footer-links {
    display: flex;

    gap: 18px;

    flex-wrap: wrap;

    align-items: center;
}

.footer-links a {
    color: var(--muted);

    font-size: 13px;
}

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


/* ================= MOBILE ================= */

@media (max-width: 750px) {

    .navbar nav {
        display: none;

        position: absolute;

        top: 63px;
        left: 0;

        width: 100%;

        padding: 18px;

        flex-direction: column;

        background: var(--card);

        backdrop-filter: blur(25px);

        border: 1px solid var(--border);

        border-radius: 20px;
    }

    .navbar nav.show {
        display: flex;
    }

    .menu-btn {
        display: block;
    }

    .hero {
        padding-top: 65px;
    }

    .hero h1 {
        letter-spacing: -2.5px;
    }

    .hero p {
        font-size: 15px;
    }

    .tool-card {
        padding: 12px;

        border-radius: 24px;
    }

    .drop-zone {
        min-height: 260px;
    }

    .feature-grid,
    .steps,
    .blog-grid {
        grid-template-columns: 1fr;
    }

    .section {
        padding: 55px 0;
    }

    .section-title {
        font-size: 32px;
    }

    .content-card {
        padding: 26px;

        margin: 50px auto;
    }

    .content-card h1 {
        font-size: 36px;
    }

    .footer-content {
        flex-direction: column;
    }

}