/*
 * Plume — Northstar v1.1.0 web stylesheet
 *
 * Identité strictement alignée sur l'app iOS (cf. NorthstarTokens.swift) :
 *  - Fonts : Fraunces (serif moderne) pour les titres, Inter pour l'UI.
 *  - Couleurs : ink #1A1A2E, indigo #6E6CFF / indigoDeep #4A48E0,
 *    surface #FAFAFB, surfaceCard #FFFFFF, lavender #E8DAFF.
 *  - Pastels par section : butter, lilac, mint, peach, sky, pink, cream.
 *  - Pattern headline : noir + mot accent indigo (PAS de gradient).
 *  - Radii larges (cards `lg` 28px / `xl` 36px), shadows douces.
 *  - CTA primaire pill noir `accent #14141F`.
 */

/* ----- Reset minimal ----- */

*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    margin: 0;
    padding: 0;
}

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

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

button {
    border: none;
    background: transparent;
    cursor: pointer;
    font-family: inherit;
}

/* ----- Tokens Northstar ----- */

:root {
    /* Ink */
    --ns-ink:        #1A1A2E;
    --ns-ink-soft:   #3A3A52;
    --ns-ink-muted:  #6B6B82;
    --ns-ink-subtle: #9D9DAE;

    /* Surfaces */
    --ns-surface:        #FAFAFB;
    --ns-surface-subtle: #F2F4FB;
    --ns-surface-card:   #FFFFFF;
    --ns-border:         #ECEDF2;
    --ns-border-strong:  #D8DAE3;

    /* Accent CTA */
    --ns-accent:         #14141F;
    --ns-accent-inverse: #FFFFFF;

    /* Indigo signature */
    --ns-indigo:        #6E6CFF;
    --ns-indigo-muted:  #EDEDFE;
    --ns-indigo-deep:   #4A48E0;

    /* Pastels */
    --ns-butter:   #FCEFB4;
    --ns-lilac:    #E5DEFB;
    --ns-mint:     #C8F2DA;
    --ns-peach:    #FCD9C5;
    --ns-lavender: #E8DAFF;
    --ns-sky:      #C9E5FB;
    --ns-pink:     #F8D5E5;
    --ns-cream:    #FAF1E5;
    --ns-sage:     #DCEAD0;

    /* Sémantiques */
    --ns-success: #1FAA6A;
    --ns-warning: #F59E0B;
    --ns-danger:  #E5484D;
    --ns-star:    #F5A524;

    /* Spacing — calqué sur l'app */
    --sp-xxs: 4px;
    --sp-xs: 8px;
    --sp-sm: 12px;
    --sp-md: 16px;
    --sp-lg: 20px;
    --sp-xl: 24px;
    --sp-xxl: 32px;
    --sp-xxxl: 40px;
    --sp-huge: 56px;

    /* Radius */
    --r-xs: 8px;
    --r-sm: 14px;
    --r-md: 20px;
    --r-lg: 28px;
    --r-xl: 36px;
    --r-xxl: 44px;
    --r-pill: 999px;

    /* Fonts */
    --font-serif: 'Fraunces', 'Cormorant Garamond', Georgia, serif;
    --font-sans:  'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

/* ----- Body ----- */

body {
    font-family: var(--font-sans);
    color: var(--ns-ink);
    background: var(--ns-surface);
    line-height: 1.55;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ----- Typography ----- */

h1, h2, h3 {
    font-family: var(--font-serif);
    font-weight: 700;
    letter-spacing: -0.02em;
    line-height: 1.1;
    color: var(--ns-ink);
    margin: 0 0 var(--sp-md);
}

h1 { font-size: clamp(40px, 6vw, 72px); }
h2 { font-size: clamp(32px, 4.5vw, 52px); }
h3 { font-size: clamp(20px, 2.4vw, 26px); font-weight: 600; }

h4 {
    font-family: var(--font-sans);
    font-weight: 600;
    font-size: 17px;
    margin: 0 0 var(--sp-xs);
    color: var(--ns-ink);
}

p {
    margin: 0 0 var(--sp-sm);
    color: var(--ns-ink-soft);
    font-size: 17px;
}

.accent {
    color: var(--ns-indigo-deep);
}

/* ----- Layout ----- */

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--sp-xl);
}

section {
    padding: var(--sp-huge) 0;
}

@media (min-width: 640px) {
    section { padding: 88px 0; }
}

.section-header {
    text-align: center;
    max-width: 720px;
    margin: 0 auto var(--sp-xxl);
    padding: 0 var(--sp-lg);
}

.section-header p {
    color: var(--ns-ink-muted);
    font-size: 18px;
    margin-top: var(--sp-xs);
}

/* ----- Header / Nav ----- */

.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(250, 250, 251, 0.85);
    backdrop-filter: saturate(160%) blur(12px);
    -webkit-backdrop-filter: saturate(160%) blur(12px);
    border-bottom: 1px solid transparent;
    transition: border-color 0.2s ease;
}

.header.scrolled {
    border-bottom-color: var(--ns-border);
}

.nav {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--sp-md) var(--sp-xl);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--sp-lg);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--sp-xs);
    font-family: var(--font-serif);
    font-weight: 700;
    font-size: 22px;
    color: var(--ns-ink);
}

.logo-img {
    width: 32px;
    height: 32px;
    border-radius: 8px;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--sp-xl);
}

.nav-links a {
    color: var(--ns-ink-soft);
    font-weight: 500;
    font-size: 15px;
    transition: color 0.15s ease;
}

.nav-links a:hover {
    color: var(--ns-ink);
}

.nav-cta {
    background: var(--ns-accent);
    color: var(--ns-accent-inverse) !important;
    padding: 10px 18px;
    border-radius: var(--r-pill);
    font-weight: 600;
}

.nav-cta:hover {
    opacity: 0.9;
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 8px;
}

.mobile-menu-btn span {
    width: 22px;
    height: 2px;
    background: var(--ns-ink);
    transition: transform 0.2s ease;
}

@media (max-width: 639px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--ns-surface-card);
        flex-direction: column;
        align-items: stretch;
        padding: var(--sp-md);
        gap: var(--sp-sm);
        border-top: 1px solid var(--ns-border);
    }
    .nav-links.active { display: flex; }
    .nav-links a {
        padding: 12px;
        font-size: 17px;
    }
    .mobile-menu-btn { display: flex; }
}

/* ----- Buttons ----- */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--sp-xs);
    padding: 14px 26px;
    border-radius: var(--r-pill);
    font-weight: 600;
    font-size: 16px;
    font-family: var(--font-sans);
    transition: transform 0.15s ease, box-shadow 0.15s ease;
    cursor: pointer;
}

.btn-primary {
    background: var(--ns-accent);
    color: var(--ns-accent-inverse);
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 12px 30px rgba(20, 20, 31, 0.18);
}

.btn-large {
    padding: 18px 34px;
    font-size: 17px;
}

.apple-icon {
    width: 18px;
    height: 18px;
}

/* ----- Hero ----- */

.hero {
    padding: var(--sp-xxl) 0 var(--sp-huge);
    background:
        radial-gradient(circle at 80% 0%, rgba(110, 108, 255, 0.10), transparent 50%),
        radial-gradient(circle at 0% 40%, rgba(232, 218, 255, 0.4), transparent 50%);
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--sp-xxl);
    align-items: center;
    padding-left: var(--sp-lg);
    padding-right: var(--sp-lg);
}

/* Bascule en 2 colonnes plus tôt (760px = tablette landscape).
   Donne au texte une plus grosse part (1.1fr) qu'à l'image (0.9fr)
   pour éviter que le portrait phone écrase le texte. */
@media (min-width: 640px) {
    .hero .container {
        grid-template-columns: 1.1fr 0.9fr;
        gap: var(--sp-xxl);
    }
}

@media (min-width: 1024px) {
    .hero .container {
        gap: var(--sp-huge);
    }
}

.hero-content { text-align: center; }

@media (min-width: 640px) {
    .hero-content { text-align: left; }
}

.hero h1 { margin-bottom: var(--sp-md); }

.hero-subtitle {
    font-size: 19px;
    color: var(--ns-ink-soft);
    margin-bottom: var(--sp-xl);
    max-width: 540px;
}

@media (max-width: 639px) {
    .hero-subtitle {
        margin-left: auto;
        margin-right: auto;
    }
}

.hero-cta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--sp-sm);
    justify-content: center;
    margin-bottom: var(--sp-xxl);
}

@media (min-width: 640px) {
    .hero-cta { justify-content: flex-start; }
}

.hero-rating {
    display: inline-flex;
    align-items: center;
    gap: var(--sp-sm);
    background: var(--ns-surface-card);
    border: 1px solid var(--ns-border);
    border-radius: var(--r-pill);
    padding: 10px 16px;
    font-size: 14px;
    color: var(--ns-ink-soft);
    box-shadow: 0 4px 18px rgba(20, 20, 31, 0.04);
    margin-bottom: var(--sp-md);
}

.hero-rating .stars {
    color: var(--ns-star);
    letter-spacing: 1px;
}

.hero-rating strong {
    color: var(--ns-ink);
    font-weight: 700;
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--sp-md);
    max-width: 480px;
}

@media (max-width: 639px) {
    .hero-stats { margin: 0 auto; }
}

.stat {
    display: flex;
    flex-direction: column;
    align-items: center;
}

@media (min-width: 640px) {
    .stat { align-items: flex-start; }
}

.stat-number {
    font-family: var(--font-serif);
    font-weight: 700;
    font-size: 28px;
    color: var(--ns-ink);
    line-height: 1;
}

.stat-label {
    font-size: 13px;
    color: var(--ns-ink-muted);
    margin-top: var(--sp-xxs);
}

.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
}

.hero-screenshot {
    position: relative;
    max-width: 300px;
    width: 100%;
    margin: 0 auto;
}

.hero-screenshot::before {
    content: "";
    position: absolute;
    inset: -32px;
    background: var(--ns-lavender);
    border-radius: 50%;
    filter: blur(60px);
    opacity: 0.5;
    z-index: -1;
}

.hero-phone-img {
    width: 100%;
    border-radius: var(--r-xl);
    box-shadow:
        0 30px 70px rgba(20, 20, 31, 0.18),
        0 8px 20px rgba(20, 20, 31, 0.08);
}

/* ----- Screenshots gallery ----- */

.screenshots-section {
    background: linear-gradient(180deg, var(--ns-surface) 0%, var(--ns-surface-subtle) 100%);
}

.screenshots-carousel {
    overflow: hidden;
    position: relative;
    padding: var(--sp-md) 0;
    mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent);
    -webkit-mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent);
}

.screenshots-track {
    display: flex;
    gap: var(--sp-lg);
    animation: scroll 50s linear infinite;
    width: max-content;
}

.screenshot-item {
    flex: 0 0 auto;
    width: 240px;
}

.screenshot-item img {
    width: 100%;
    border-radius: var(--r-lg);
    box-shadow:
        0 20px 50px rgba(20, 20, 31, 0.12),
        0 4px 12px rgba(20, 20, 31, 0.06);
}

/* Translate width = (item width + gap) × original items count (7). */
@keyframes scroll {
    from { transform: translateX(0); }
    to   { transform: translateX(calc(-1 * (240px + 20px) * 7)); }
}

/* ----- Features grid ----- */

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--sp-lg);
}

.feature-card {
    background: var(--ns-surface-card);
    border: 1px solid var(--ns-border);
    border-radius: var(--r-lg);
    padding: var(--sp-xl);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.feature-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 16px 40px rgba(20, 20, 31, 0.08);
}

.feature-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--r-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--sp-md);
}

.feature-icon svg {
    width: 26px;
    height: 26px;
}

.icon-blue   { background: var(--ns-sky);      color: var(--ns-indigo-deep); }
.icon-green  { background: var(--ns-mint);     color: var(--ns-success); }
.icon-purple { background: var(--ns-lavender); color: var(--ns-indigo-deep); }
.icon-orange { background: var(--ns-peach);    color: #C24A00; }
.icon-pink   { background: var(--ns-pink);     color: #C5396E; }
.icon-teal   { background: var(--ns-sage);     color: var(--ns-success); }
.icon-yellow { background: var(--ns-butter);   color: #966700; }
.icon-red    { background: var(--ns-peach);    color: var(--ns-danger); }

.feature-card h3 { margin-bottom: var(--sp-xs); }
.feature-card p {
    margin: 0;
    font-size: 15px;
    color: var(--ns-ink-muted);
}

/* ----- How it works ----- */

.how-it-works {
    background: var(--ns-surface-card);
}

.steps {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--sp-xl);
    align-items: stretch;
}

@media (min-width: 880px) {
    .steps {
        grid-template-columns: 1fr auto 1fr auto 1fr;
        align-items: center;
    }
}

.step {
    background: var(--ns-surface);
    border: 1px solid var(--ns-border);
    border-radius: var(--r-lg);
    padding: var(--sp-xl);
    text-align: center;
    height: 100%;
}

.step-number {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--ns-indigo-muted);
    color: var(--ns-indigo-deep);
    font-family: var(--font-serif);
    font-weight: 700;
    font-size: 22px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--sp-md);
}

.step p {
    font-size: 15px;
    color: var(--ns-ink-muted);
    margin: 0;
}

.step-arrow {
    color: var(--ns-indigo);
    font-size: 28px;
    text-align: center;
    font-weight: 300;
}

@media (max-width: 879px) {
    .step-arrow { transform: rotate(90deg); }
}

/* ----- Levels ----- */

.levels-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: var(--sp-md);
}

.level-card {
    background: var(--ns-surface-card);
    border: 1px solid var(--ns-border);
    border-radius: var(--r-lg);
    padding: var(--sp-xl);
    text-align: center;
    transition: transform 0.2s ease;
}

.level-card:hover { transform: translateY(-2px); }

.level-emoji {
    font-size: 36px;
    display: block;
    margin-bottom: var(--sp-sm);
}

.level-card p {
    margin: 0;
    font-size: 14px;
    color: var(--ns-ink-muted);
}

/* ----- FAQ ----- */

.faq-list {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: var(--sp-sm);
}

.faq-item {
    background: var(--ns-surface-card);
    border: 1px solid var(--ns-border);
    border-radius: var(--r-md);
    padding: var(--sp-md) var(--sp-lg);
    transition: border-color 0.15s ease;
}

.faq-item[open] {
    border-color: var(--ns-indigo);
}

.faq-item summary {
    cursor: pointer;
    font-weight: 600;
    font-size: 17px;
    color: var(--ns-ink);
    list-style: none;
    padding-right: var(--sp-xl);
    position: relative;
}

.faq-item summary::-webkit-details-marker { display: none; }

.faq-item summary::after {
    content: "+";
    position: absolute;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    font-size: 24px;
    color: var(--ns-indigo-deep);
    font-weight: 300;
    transition: transform 0.2s ease;
    line-height: 1;
}

.faq-item[open] summary::after {
    transform: translateY(-50%) rotate(45deg);
}

.faq-item p {
    margin: var(--sp-sm) 0 0;
    font-size: 15px;
    color: var(--ns-ink-soft);
}

/* ----- CTA section ----- */

.cta-section {
    padding: var(--sp-huge) var(--sp-lg);
    text-align: center;
    background:
        radial-gradient(circle at 50% 100%, rgba(110, 108, 255, 0.12), transparent 60%),
        var(--ns-lavender);
    margin: var(--sp-xxl) var(--sp-lg);
    border-radius: var(--r-xxl);
}

@media (min-width: 880px) {
    .cta-section {
        margin: var(--sp-xxxl) auto;
        max-width: 1100px;
        padding: 88px var(--sp-xxl);
    }
}

.cta-content { max-width: 640px; margin: 0 auto; }
.cta-content h2 { margin-bottom: var(--sp-sm); }
.cta-content p {
    color: var(--ns-ink-soft);
    font-size: 18px;
    margin-bottom: var(--sp-xl);
}

/* ----- Footer ----- */

.footer {
    background: var(--ns-surface-card);
    border-top: 1px solid var(--ns-border);
    padding: var(--sp-xxl) var(--sp-xl);
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--sp-md);
}

@media (min-width: 640px) {
    .footer-content {
        flex-direction: row;
        justify-content: space-between;
    }
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: var(--sp-xs);
    font-family: var(--font-serif);
    font-weight: 700;
    font-size: 20px;
}

.footer-logo {
    width: 28px;
    height: 28px;
    border-radius: 6px;
}

.footer-links {
    display: flex;
    gap: var(--sp-lg);
    flex-wrap: wrap;
    justify-content: center;
}

.footer-links a {
    color: var(--ns-ink-muted);
    font-size: 14px;
    transition: color 0.15s ease;
}

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

.footer-copyright {
    font-size: 13px;
    color: var(--ns-ink-subtle);
    margin: 0;
}

/* ----- Legal pages (terms / privacy) ----- */

.legal-page {
    max-width: 800px;
    margin: 0 auto;
    /* Padding latéral plus généreux (xl 24px sur mobile, xxl 32px
       sur desktop) — sinon le texte légal arrive collé au bord. */
    padding: var(--sp-huge) var(--sp-xl);
}

@media (min-width: 640px) {
    .legal-page {
        padding-left: var(--sp-xxl);
        padding-right: var(--sp-xxl);
    }
}

.legal-page h1 {
    font-size: clamp(32px, 4vw, 48px);
    margin-bottom: var(--sp-xs);
}

.legal-page .updated-date {
    color: var(--ns-ink-muted);
    font-size: 14px;
    margin-bottom: var(--sp-xxl);
}

.legal-page h2 {
    font-size: clamp(22px, 2.4vw, 26px);
    margin-top: var(--sp-xxl);
    margin-bottom: var(--sp-sm);
}

.legal-page p,
.legal-page li {
    color: var(--ns-ink-soft);
    font-size: 16px;
    line-height: 1.7;
}

.legal-page ul {
    padding-left: var(--sp-lg);
}

.legal-page a {
    color: var(--ns-indigo-deep);
    border-bottom: 1px solid var(--ns-indigo-muted);
}

.legal-page a:hover {
    border-bottom-color: var(--ns-indigo);
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}