/* =========================================================
   MY UTILITY HUB — FINAL PROFESSIONAL EYE-FRIENDLY DESIGN
   ========================================================= */

:root {
    --bg: #f3f8f7;
    --bg-soft: #eaf4f2;
    --surface: #ffffff;
    --surface-hover: #f7fbfa;

    --primary: #087f7b;
    --primary-dark: #056563;
    --primary-soft: #dff2ef;

    --text: #18302f;
    --text-soft: #58706e;

    --border: #d5e5e2;
    --shadow: 0 8px 25px rgba(18, 70, 67, 0.08);

    --radius: 18px;
}

/* ---------- BASIC ---------- */

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family:
        system-ui,
        -apple-system,
        BlinkMacSystemFont,
        "Segoe UI",
        sans-serif;

    background:
        radial-gradient(circle at top left, #e8f5f2 0, transparent 35%),
        linear-gradient(135deg, #f6faf9, #edf6f4);

    color: var(--text);
    line-height: 1.7;
    min-height: 100vh;
}

/* ---------- HEADER ---------- */

header {
    background: rgba(255, 255, 255, 0.94);
    border-bottom: 1px solid var(--border);
    box-shadow: 0 3px 18px rgba(20, 70, 67, 0.06);
    padding: 22px 5%;
    position: sticky;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(12px);
}

header h1,
header .logo,
header a {
    color: var(--primary);
}

header h1 {
    margin: 0;
    font-size: clamp(28px, 4vw, 42px);
    font-weight: 800;
    letter-spacing: -0.5px;
}

/* ---------- MAIN ---------- */

main {
    width: min(1180px, 92%);
    margin: 0 auto;
}

section {
    margin: 28px 0;
}

/* ---------- NAVIGATION ---------- */

nav {
    width: min(1180px, 92%);
    margin: 20px auto;
}

nav a,
nav details > summary {
    display: block;
    text-decoration: none;
    color: var(--text);

    background: rgba(255, 255, 255, 0.9);

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

    padding: 18px 22px;
    margin: 10px 0;

    font-size: clamp(17px, 2vw, 21px);
    font-weight: 500;

    box-shadow: 0 3px 12px rgba(20, 70, 67, 0.04);

    transition:
        transform 0.2s ease,
        background 0.2s ease,
        border-color 0.2s ease,
        box-shadow 0.2s ease;
}

nav a:hover,
nav details > summary:hover {
    background: var(--primary-soft);
    border-color: #b7dcd7;
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

nav details {
    margin: 12px 0;
    border-radius: var(--radius);
}

nav details > summary {
    cursor: pointer;
    list-style: none;
    color: var(--primary-dark);
    font-weight: 700;
}

nav details > summary::-webkit-details-marker {
    display: none;
}

nav details > summary::before {
    content: "▸";
    display: inline-block;
    margin-right: 12px;
    color: var(--primary);
    transition: transform 0.2s ease;
}

nav details[open] > summary::before {
    transform: rotate(90deg);
}

nav details[open] > summary {
    background: var(--primary-soft);
    border-color: #b7dcd7;
}

nav details > a {
    margin-left: 16px;
    width: calc(100% - 16px);
    background: rgba(255, 255, 255, 0.96);
}

/* ---------- HERO ---------- */

.hero {
    background:
        linear-gradient(
            135deg,
            rgba(224, 244, 240, 0.96),
            rgba(246, 250, 249, 0.98)
        );

    border: 1px solid #cfe5e1;
    border-radius: 26px;

    padding: clamp(35px, 6vw, 70px);

    margin: 35px 0;

    box-shadow:
        0 15px 40px rgba(18, 70, 67, 0.08);
}

.hero h1,
.hero h2 {
    color: var(--text);
    margin-top: 0;
    font-size: clamp(30px, 5vw, 52px);
    line-height: 1.2;
}

.hero p {
    color: var(--text-soft);
    font-size: clamp(17px, 2.5vw, 21px);
    max-width: 800px;
}

/* ---------- CARDS ---------- */

.card,
article,
.tool-card,
section {
    border-color: var(--border);
}

.card,
.tool-card {
    background: rgba(255, 255, 255, 0.94);
    border: 1px solid var(--border);
    border-radius: 22px;
    padding: 28px;
    margin: 22px 0;
    box-shadow: var(--shadow);
}

.card:hover,
.tool-card:hover {
    box-shadow: 0 14px 35px rgba(18, 70, 67, 0.11);
}

/* ---------- HEADINGS ---------- */

h1,
h2,
h3,
h4 {
    color: var(--text);
    line-height: 1.25;
}

h2 {
    font-size: clamp(27px, 4vw, 38px);
}

h3 {
    font-size: clamp(22px, 3vw, 30px);
}

p {
    color: var(--text-soft);
}

/* ---------- LINKS ---------- */

a {
    color: var(--primary);
}

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

/* ---------- BUTTONS ---------- */

button,
.btn,
.button,
input[type="submit"] {
    border: 0;
    border-radius: 12px;

    background: linear-gradient(
        135deg,
        #0b8f89,
        #08746f
    );

    color: white;

    padding: 13px 22px;

    font-size: 16px;
    font-weight: 700;

    cursor: pointer;

    box-shadow: 0 6px 16px rgba(8, 127, 123, 0.2);

    transition:
        transform 0.2s ease,
        box-shadow 0.2s ease;
}

button:hover,
.btn:hover,
.button:hover,
input[type="submit"]:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 22px rgba(8, 127, 123, 0.25);
}

/* ---------- FORM ELEMENTS ---------- */

input,
select,
textarea {
    width: 100%;
    max-width: 100%;

    padding: 13px 15px;

    border: 1px solid var(--border);
    border-radius: 12px;

    background: #ffffff;
    color: var(--text);

    font-size: 16px;

    outline: none;

    transition:
        border-color 0.2s ease,
        box-shadow 0.2s ease;
}

input:focus,
select:focus,
textarea:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(8, 127, 123, 0.12);
}

/* ---------- TABLE ---------- */

table {
    width: 100%;
    border-collapse: collapse;
    background: white;
    border-radius: 15px;
    overflow: hidden;
}

th,
td {
    padding: 13px 15px;
    border-bottom: 1px solid var(--border);
    text-align: left;
}

th {
    background: var(--primary-soft);
    color: var(--primary-dark);
}

/* ---------- CODE ---------- */

pre,
code {
    font-family:
        "SFMono-Regular",
        Consolas,
        "Liberation Mono",
        monospace;
}

pre {
    background: #172525;
    color: #e8f6f3;
    padding: 20px;
    border-radius: 15px;
    overflow-x: auto;
}

/* ---------- FOOTER ---------- */

footer {
    margin-top: 60px;
    padding: 30px 20px;

    text-align: center;

    background: #183b3a;
    color: #dcecea;
}

footer a {
    color: #aee3dc;
}

/* ---------- LARGE DESKTOP ---------- */

@media (min-width: 1200px) {
    header {
        padding-left: 7%;
        padding-right: 7%;
    }

    main,
    nav {
        width: min(1180px, 86%);
    }

    .hero {
        padding: 70px;
    }
}

/* ---------- TABLET ---------- */

@media (max-width: 900px) {
    main,
    nav {
        width: 94%;
    }

    .hero {
        padding: 40px 28px;
    }
}

/* ---------- MOBILE ---------- */

@media (max-width: 600px) {
    header {
        padding: 18px 20px;
    }

    main,
    nav {
        width: 92%;
    }

    section {
        margin: 20px 0;
    }

    nav a,
    nav details > summary {
        padding: 17px 18px;
        font-size: 17px;
        border-radius: 16px;
    }

    nav details > a {
        margin-left: 8px;
        width: calc(100% - 8px);
        font-size: 16px;
    }

    .hero {
        padding: 32px 22px;
        border-radius: 22px;
    }

    .card,
    .tool-card {
        padding: 22px 18px;
        border-radius: 18px;
    }

    button,
    .btn,
    .button,
    input[type="submit"] {
        width: 100%;
    }

    table {
        font-size: 14px;
    }
}

/* ---------- ACCESSIBILITY ---------- */

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    *,
    *::before,
    *::after {
        transition: none !important;
        animation: none !important;
    }
}