/* =========================================================
   NOTE.ARSIN — MAIN STYLESHEET
   Version: 1.0
   ========================================================= */

/* =========================
   RESET
   ========================= */

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

html {
    scroll-behavior: smooth;
}

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

    background: #ffffff;
    color: #151515;
    line-height: 1.6;
    overflow-x: hidden;
}

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

button {
    font: inherit;
}

img {
    max-width: 100%;
    display: block;
}


/* =========================
   VARIABLES
   ========================= */

:root {

    --primary: #7c3aed;
    --primary-dark: #5b21b6;
    --primary-light: #ede9fe;

    --dark: #111111;
    --dark-2: #18181b;
    --dark-3: #27272a;

    --text: #18181b;
    --text-light: #71717a;
    --text-white: #ffffff;

    --background: #ffffff;
    --background-soft: #fafafa;

    --border: #e4e4e7;

    --radius-sm: 10px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-xl: 32px;

    --shadow-sm:
        0 4px 12px rgba(0, 0, 0, 0.05);

    --shadow-md:
        0 15px 40px rgba(0, 0, 0, 0.08);

    --shadow-lg:
        0 25px 70px rgba(0, 0, 0, 0.12);

    --transition:
        0.25s ease;
}


/* =========================
   CONTAINER
   ========================= */

.container {
    width: min(1180px, calc(100% - 40px));
    margin-inline: auto;
}


/* =========================
   HEADER
   ========================= */

.site-header {
    position: sticky;
    top: 0;
    z-index: 1000;

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

    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);

    border-bottom: 1px solid rgba(228, 228, 231, 0.7);
}

.header-container {
    min-height: 76px;

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

    gap: 30px;
}


/* =========================
   LOGO
   ========================= */

.logo {
    display: inline-flex;
    align-items: center;
    gap: 9px;

    font-size: 21px;
    font-weight: 800;

    white-space: nowrap;
}

.logo-icon {
    width: 38px;
    height: 38px;

    display: grid;
    place-items: center;

    border-radius: 12px;

    color: white;

    background:
        linear-gradient(
            135deg,
            var(--primary),
            #a855f7
        );

    box-shadow:
        0 8px 20px rgba(124, 58, 237, 0.25);
}

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


/* =========================
   NAVIGATION
   ========================= */

.main-nav {
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-link {
    position: relative;

    padding: 9px 13px;

    color: #52525b;

    font-size: 14px;
    font-weight: 600;

    border-radius: 10px;

    transition: var(--transition);
}

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


/* =========================
   HEADER ACTIONS
   ========================= */

.header-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}

.icon-button,
.menu-button {
    width: 42px;
    height: 42px;

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

    background: white;

    cursor: pointer;

    transition: var(--transition);
}

.icon-button:hover,
.menu-button:hover {
    color: var(--primary);

    border-color: var(--primary);

    transform: translateY(-2px);
}

.menu-button {
    display: none;
}


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

.hero {
    position: relative;

    min-height: 680px;

    display: flex;
    align-items: center;

    overflow: hidden;

    background:
        radial-gradient(
            circle at 85% 30%,
            rgba(124, 58, 237, 0.16),
            transparent 32%
        ),
        radial-gradient(
            circle at 10% 80%,
            rgba(168, 85, 247, 0.1),
            transparent 30%
        ),
        #ffffff;
}

.hero-container {
    display: grid;

    grid-template-columns:
        minmax(0, 1.1fr)
        minmax(350px, 0.9fr);

    align-items: center;

    gap: 70px;
}

.hero-content {
    max-width: 650px;
}

.hero-badge {
    display: inline-flex;

    padding: 8px 13px;

    margin-bottom: 22px;

    border: 1px solid #ddd6fe;
    border-radius: 999px;

    background: #f5f3ff;
    color: var(--primary);

    font-size: 12px;
    font-weight: 800;

    letter-spacing: 0.08em;
}

.hero h1 {
    margin-bottom: 22px;

    font-size: clamp(46px, 6vw, 76px);

    line-height: 1.04;

    letter-spacing: -0.045em;

    font-weight: 900;
}

.hero h1 span {
    display: block;

    color: var(--primary);
}

.hero-content > p {
    max-width: 580px;

    margin-bottom: 32px;

    color: var(--text-light);

    font-size: 18px;
}

.hero-buttons {
    display: flex;
    flex-wrap: wrap;

    gap: 12px;
}


/* =========================
   BUTTONS
   ========================= */

.button {
    min-height: 50px;

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

    padding: 0 22px;

    border-radius: 13px;

    font-size: 14px;
    font-weight: 750;

    transition: var(--transition);
}

.button-primary {
    color: white;

    background:
        linear-gradient(
            135deg,
            var(--primary),
            #9333ea
        );

    box-shadow:
        0 10px 25px rgba(124, 58, 237, 0.25);
}

.button-primary:hover {
    transform: translateY(-3px);

    box-shadow:
        0 15px 35px rgba(124, 58, 237, 0.35);
}

.button-secondary {
    border: 1px solid var(--border);

    background: white;
}

.button-secondary:hover {
    border-color: var(--primary);

    color: var(--primary);

    transform: translateY(-3px);
}


/* =========================
   HERO MUSIC CARD
   ========================= */

.hero-visual {
    display: flex;
    justify-content: center;
}

.music-card {
    width: min(100%, 420px);

    padding: 28px;

    border: 1px solid rgba(255, 255, 255, 0.7);

    border-radius: 30px;

    color: white;

    background:
        linear-gradient(
            145deg,
            #18181b,
            #27272a
        );

    box-shadow:
        0 35px 80px rgba(0, 0, 0, 0.22);

    transform: rotate(2deg);

    transition: 0.4s ease;
}

.music-card:hover {
    transform:
        rotate(0deg)
        translateY(-8px);
}

.music-card-top {
    display: flex;
    align-items: center;
    justify-content: space-between;

    color: #d4d4d8;

    font-size: 13px;
    font-weight: 700;
}

.music-card-top span:first-child {
    font-size: 32px;

    color: #c4b5fd;
}

.staff {
    min-height: 220px;

    margin: 25px 0;

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

    border-top: 1px solid #52525b;
    border-bottom: 1px solid #52525b;

    font-family: Georgia, serif;

    font-size: 55px;

    color: #c4b5fd;
}

.music-info {
    display: flex;
    flex-direction: column;

    gap: 5px;
}

.music-info strong {
    font-size: 18px;
}

.music-info small {
    color: #a1a1aa;
}


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

.section {
    padding: 110px 0;
}

.section-dark {
    color: white;

    background:
        linear-gradient(
            135deg,
            #111111,
            #18181b
        );
}

.section-heading {
    max-width: 680px;

    margin-bottom: 55px;
}

.section-label {
    display: inline-block;

    margin-bottom: 12px;

    color: var(--primary);

    font-size: 12px;
    font-weight: 850;

    letter-spacing: 0.12em;
}

.section-heading h2,
.about-container h2 {
    margin-bottom: 14px;

    font-size: clamp(32px, 5vw, 48px);

    line-height: 1.1;

    letter-spacing: -0.035em;
}

.section-heading p {
    color: var(--text-light);

    font-size: 16px;
}

.section-dark .section-heading p {
    color: #a1a1aa;
}


/* =========================
   NOTES
   ========================= */

.notes-grid {
    display: grid;

    grid-template-columns:
        repeat(4, minmax(0, 1fr));

    gap: 20px;
}

.note-card {
    padding: 28px;

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

    border-radius: var(--radius-lg);

    background: white;

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

    transition: var(--transition);
}

.note-card:hover {
    transform: translateY(-7px);

    border-color: #c4b5fd;

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

.note-icon {
    width: 56px;
    height: 56px;

    display: grid;
    place-items: center;

    margin-bottom: 22px;

    border-radius: 16px;

    background: var(--primary-light);

    color: var(--primary);

    font-size: 28px;
}

.note-card h3 {
    margin-bottom: 8px;

    font-size: 21px;
}

.note-card p {
    min-height: 52px;

    margin-bottom: 20px;

    color: var(--text-light);

    font-size: 14px;
}

.learn-button {
    padding: 0;

    border: none;

    background: transparent;

    color: var(--primary);

    font-weight: 750;

    cursor: pointer;

    transition: var(--transition);
}

.learn-button:hover {
    transform: translateX(4px);
}


/* =========================
   INSTRUMENTS
   ========================= */

.instrument-grid {
    display: grid;

    grid-template-columns:
        repeat(4, minmax(0, 1fr));

    gap: 18px;
}

.instrument-card {
    padding: 28px;

    border: 1px solid #3f3f46;

    border-radius: var(--radius-lg);

    background: rgba(255, 255, 255, 0.03);

    transition: var(--transition);
}

.instrument-card:hover {
    border-color: #8b5cf6;

    background: rgba(124, 58, 237, 0.08);

    transform: translateY(-6px);
}

.instrument-icon {
    margin-bottom: 20px;

    font-size: 38px;
}

.instrument-card h3 {
    margin-bottom: 8px;

    font-size: 20px;
}

.instrument-card p {
    margin-bottom: 20px;

    color: #a1a1aa;

    font-size: 14px;
}

.card-link {
    color: #c4b5fd;

    font-size: 14px;
    font-weight: 750;
}


/* =========================
   TUTORIALS
   ========================= */

.tutorial-layout {
    display: grid;

    grid-template-columns:
        1.2fr 0.8fr;

    gap: 30px;

    padding: 45px;

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

    border-radius: var(--radius-xl);

    background: var(--background-soft);
}

.tutorial-content h3 {
    margin-bottom: 14px;

    font-size: 30px;
}

.tutorial-content p {
    max-width: 600px;

    margin-bottom: 28px;

    color: var(--text-light);
}

.tutorial-statistics {
    display: grid;

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

    gap: 12px;
}

.stat {
    min-height: 140px;

    display: flex;
    flex-direction: column;

    justify-content: center;

    padding: 20px;

    border-radius: 18px;

    background: white;

    text-align: center;

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

.stat strong {
    margin-bottom: 5px;

    color: var(--primary);

    font-size: 36px;
}

.stat span {
    color: var(--text-light);

    font-size: 13px;
}


/* =========================
   ABOUT
   ========================= */

.about-section {
    background: #fafafa;
}

.about-container {
    display: grid;

    grid-template-columns:
        0.8fr 1.2fr;

    align-items: center;

    gap: 80px;
}

.about-container > p {
    color: var(--text-light);

    font-size: 18px;
}


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

.site-footer {
    padding: 60px 0 25px;

    color: #a1a1aa;

    background: #09090b;
}

.footer-container {
    display: grid;

    grid-template-columns:
        1fr auto;

    gap: 35px;
}

.footer-brand p {
    max-width: 350px;

    margin-top: 15px;

    font-size: 14px;
}

.footer-links {
    display: flex;

    gap: 22px;

    align-items: center;

    font-size: 14px;
}

.footer-links a {
    transition: var(--transition);
}

.footer-links a:hover {
    color: white;
}

.footer-bottom {
    grid-column: 1 / -1;

    padding-top: 25px;

    border-top: 1px solid #27272a;

    font-size: 13px;
}


/* =========================
   RESPONSIVE — TABLET
   ========================= */

@media (max-width: 950px) {

    .hero-container {
        grid-template-columns: 1fr;

        gap: 50px;

        padding-top: 70px;
        padding-bottom: 70px;
    }

    .hero-content {
        max-width: 750px;
    }

    .hero-visual {
        justify-content: flex-start;
    }

    .notes-grid,
    .instrument-grid {
        grid-template-columns:
            repeat(2, minmax(0, 1fr));
    }

    .tutorial-layout {
        grid-template-columns: 1fr;
    }

    .about-container {
        grid-template-columns: 1fr;

        gap: 25px;
    }
}


/* =========================
   RESPONSIVE — MOBILE
   ========================= */

@media (max-width: 700px) {

    .container {
        width: min(
            100% - 28px,
            1180px
        );
    }

    .header-container {
        min-height: 68px;
    }

    .main-nav {
        position: absolute;

        top: calc(100% + 8px);

        left: 14px;
        right: 14px;

        display: none;
        flex-direction: column;

        padding: 10px;

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

        border-radius: 18px;

        background: rgba(255, 255, 255, 0.97);

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

    .main-nav.open {
        display: flex;
    }

    .nav-link {
        width: 100%;

        padding: 13px 15px;
    }

    .menu-button {
        display: block;
    }

    .hero {
        min-height: auto;
    }

    .hero-container {
        padding-top: 70px;
        padding-bottom: 80px;
    }

    .hero h1 {
        font-size: clamp(42px, 13vw, 62px);
    }

    .hero-content > p {
        font-size: 16px;
    }

    .hero-buttons {
        flex-direction: column;
        align-items: stretch;
    }

    .button {
        width: 100%;
    }

    .music-card {
        transform: none;
    }

    .notes-grid,
    .instrument-grid {
        grid-template-columns: 1fr;
    }

    .section {
        padding: 80px 0;
    }

    .section-heading {
        margin-bottom: 35px;
    }

    .tutorial-layout {
        padding: 25px;
    }

    .tutorial-statistics {
        grid-template-columns: 1fr;
    }

    .about-container > p {
        font-size: 16px;
    }

    .footer-container {
        grid-template-columns: 1fr;
    }

    .footer-links {
        flex-wrap: wrap;
    }

}


/* =========================
   ACCESSIBILITY
   ========================= */

button:focus-visible,
a:focus-visible {
    outline: 3px solid rgba(124, 58, 237, 0.35);

    outline-offset: 3px;
}


/* =========================
   REDUCED MOTION
   ========================= */

@media (prefers-reduced-motion: reduce) {

    html {
        scroll-behavior: auto;
    }

    *,
    *::before,
    *::after {
        transition-duration: 0.01ms !important;
        animation-duration: 0.01ms !important;
    }

  }