/* ============================
   GENERATOR QR — Redesign 2024
   Dark tech / editorial aesthetic
   ============================ */

:root {
    --bg:         #0a0a0f;
    --bg-card:    #111118;
    --bg-input:   #18181f;
    --bg-hover:   #1e1e28;
    --border:     rgba(255,255,255,0.08);
    --border-hl:  rgba(99,207,255,0.35);
    --accent:     #63cfff;
    --accent-2:   #a78bfa;
    --accent-dim: rgba(99,207,255,0.12);
    --text:       #f0f0f8;
    --text-muted: #6b6b80;
    --text-dim:   #3a3a50;
    --green:      #4ade80;
    --radius-sm:  8px;
    --radius-md:  16px;
    --radius-lg:  24px;
    --font-display: 'Syne', sans-serif;
    --font-mono:    'DM Mono', monospace;
}

/* === RESET & BASE === */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
    font-family: var(--font-display);
    background-color: var(--bg);
    color: var(--text);
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
}

/* === BACKGROUND EFFECTS === */
.bg-grid {
    position: fixed;
    inset: 0;
    background-image:
        linear-gradient(rgba(99,207,255,0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(99,207,255,0.03) 1px, transparent 1px);
    background-size: 48px 48px;
    pointer-events: none;
    z-index: 0;
}

.bg-glow {
    position: fixed;
    top: -200px;
    left: 50%;
    transform: translateX(-50%);
    width: 700px;
    height: 500px;
    background: radial-gradient(ellipse at center, rgba(99,207,255,0.08) 0%, transparent 70%);
    pointer-events: none;
    z-index: 0;
}

/* === HEADER / NAV === */
header {
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    background: rgba(10,10,15,0.85);
    border-bottom: 1px solid var(--border);
}

.nav {
    max-width: 960px;
    margin: 0 auto;
    padding: 14px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-wrap {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-sm);
    background: var(--accent-dim);
    border: 1px solid var(--border-hl);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    flex-shrink: 0;
}

.logo {
    width: 28px;
    height: 28px;
    object-fit: contain;
}

.brand-name {
    font-size: 15px;
    font-weight: 800;
    letter-spacing: 0.12em;
    color: var(--text);
}

.brand-accent {
    color: var(--accent);
}

.nav-link {
    font-family: var(--font-mono);
    font-size: 13px;
    color: var(--text-muted);
    text-decoration: none;
    border: 1px solid var(--border);
    padding: 6px 16px;
    border-radius: 99px;
    transition: all 0.2s;
}

.nav-link:hover {
    color: var(--accent);
    border-color: var(--border-hl);
    background: var(--accent-dim);
}

/* === MAIN LAYOUT === */
main {
    position: relative;
    z-index: 1;
    max-width: 960px;
    margin: 0 auto;
    padding: 0 24px 80px;
}

/* === HERO === */
.hero {
    padding: 72px 0 48px;
    text-align: center;
}

.hero-tag {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--accent);
    letter-spacing: 0.15em;
    text-transform: uppercase;
    background: var(--accent-dim);
    border: 1px solid var(--border-hl);
    padding: 5px 14px;
    border-radius: 99px;
    margin-bottom: 28px;
    animation: fadeUp 0.6s ease both;
}

.hero-title {
    font-size: clamp(2.4rem, 6vw, 4rem);
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: -0.02em;
    animation: fadeUp 0.6s 0.1s ease both;
}

.hero-title-accent {
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-sub {
    margin-top: 16px;
    font-family: var(--font-mono);
    font-size: 15px;
    color: var(--text-muted);
    animation: fadeUp 0.6s 0.2s ease both;
}

/* === CARD === */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 2px;
    animation: fadeUp 0.6s 0.3s ease both;
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: var(--radius-lg);
    background: linear-gradient(135deg, rgba(99,207,255,0.06) 0%, transparent 60%);
    pointer-events: none;
}

.card-inner {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0;
    border-radius: calc(var(--radius-lg) - 2px);
    overflow: hidden;
}

/* === INPUT SIDE === */
.input-side {
    padding: 32px;
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.field-label {
    display: flex;
    align-items: center;
    gap: 8px;
    font-family: var(--font-mono);
    font-size: 12px;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--text-muted);
}

.label-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--accent);
    box-shadow: 0 0 8px var(--accent);
    animation: pulse 2s infinite;
}

.textarea {
    flex: 1;
    min-height: 180px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    color: var(--text);
    font-family: var(--font-mono);
    font-size: 14px;
    line-height: 1.6;
    padding: 16px;
    resize: vertical;
    transition: border-color 0.2s, box-shadow 0.2s;
    outline: none;
}

.textarea::placeholder { color: var(--text-dim); }

.textarea:focus {
    border-color: var(--border-hl);
    box-shadow: 0 0 0 3px rgba(99,207,255,0.07);
}

/* === BUTTONS === */
.btn-row {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 10px;
}

.btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 20px;
    border-radius: var(--radius-sm);
    font-family: var(--font-display);
    font-size: 14px;
    font-weight: 600;
    letter-spacing: 0.03em;
    cursor: pointer;
    border: none;
    transition: all 0.2s;
    width: auto;
    margin-top: 0;
}

.btn-ghost {
    background: var(--bg-input);
    color: var(--text-muted);
    border: 1px solid var(--border);
}

.btn-ghost:hover {
    background: var(--bg-hover);
    color: var(--text);
    border-color: rgba(255,255,255,0.15);
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent) 0%, #4da8d4 100%);
    color: #0a0a0f;
    font-weight: 700;
    box-shadow: 0 4px 20px rgba(99,207,255,0.25);
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 28px rgba(99,207,255,0.4);
}

.btn-primary:active { transform: translateY(0); }

/* === OUTPUT SIDE === */
.output-side {
    padding: 32px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 16px;
    background: rgba(0,0,0,0.15);
}

.qr-frame {
    width: 256px;
    height: 256px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
    background: var(--bg-input);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    transition: border-color 0.3s;
}

.qr-frame.has-qr {
    border-color: var(--border-hl);
    box-shadow: 0 0 32px rgba(99,207,255,0.1);
}

/* Corner accents */
.qr-frame::before, .qr-frame::after {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    border-color: var(--accent);
    border-style: solid;
    opacity: 0.5;
}
.qr-frame::before { top: 8px; left: 8px; border-width: 2px 0 0 2px; border-radius: 2px 0 0 0; }
.qr-frame::after  { bottom: 8px; right: 8px; border-width: 0 2px 2px 0; border-radius: 0 0 2px 0; }

.qr-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    color: var(--text-dim);
    text-align: center;
    padding: 20px;
    transition: opacity 0.3s;
}

.qr-placeholder p {
    font-family: var(--font-mono);
    font-size: 12px;
    line-height: 1.5;
}

.qr-output {
    display: flex;
    align-items: center;
    justify-content: center;
}

/* QR overrides */
.qr-output canvas,
.qr-output img {
    border-radius: 8px;
    display: block;
}

.qr-caption {
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--text-muted);
    text-align: center;
    min-height: 20px;
}

/* === INFO SECTION === */
.info {
    margin-top: 96px;
    animation: fadeUp 0.6s 0.4s ease both;
}

.info-header {
    text-align: center;
    margin-bottom: 48px;
}

.section-tag {
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--accent);
    display: block;
    margin-bottom: 12px;
}

.info-title {
    font-size: clamp(1.6rem, 4vw, 2.4rem);
    font-weight: 800;
    letter-spacing: -0.02em;
}

.uses-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    margin-bottom: 48px;
}

.use-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 24px;
    transition: all 0.2s;
}

.use-card:hover {
    border-color: var(--border-hl);
    background: var(--bg-hover);
    transform: translateY(-2px);
}

.use-icon {
    font-size: 28px;
    margin-bottom: 12px;
}

.use-card h4 {
    font-size: 14px;
    font-weight: 700;
    letter-spacing: 0.02em;
    margin-bottom: 8px;
    color: var(--text);
}

.use-card p {
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--text-muted);
    line-height: 1.6;
}

/* === AUDIENCE === */
.audience {
    text-align: center;
    margin-bottom: 40px;
}

.audience h3 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 20px;
    color: var(--text-muted);
}

.tags-row {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: center;
}

.tag {
    font-family: var(--font-mono);
    font-size: 13px;
    padding: 8px 18px;
    border-radius: 99px;
    border: 1px solid var(--border);
    color: var(--text-muted);
    background: var(--bg-card);
    transition: all 0.2s;
}

.tag:hover {
    border-color: var(--border-hl);
    color: var(--accent);
    background: var(--accent-dim);
}

.info-cta {
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
    font-family: var(--font-mono);
    font-size: 14px;
    color: var(--text-muted);
    line-height: 1.8;
    padding: 32px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    border-left: 3px solid var(--accent);
}

/* === FOOTER === */
.footer {
    position: relative;
    z-index: 1;
    max-width: 960px;
    margin: 0 auto;
    padding: 24px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-top: 1px solid var(--border);
}

.footer-brand {
    font-size: 14px;
    font-weight: 800;
    letter-spacing: 0.12em;
    color: var(--text-dim);
}

.footer-brand span { color: var(--accent); }

.footer-copy {
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--text-dim);
}

/* === ANIMATIONS === */
@keyframes fadeUp {
    from { opacity: 0; transform: translateY(20px); }
    to   { opacity: 1; transform: translateY(0); }
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50%       { opacity: 0.4; }
}

@keyframes qrReveal {
    from { opacity: 0; transform: scale(0.85); }
    to   { opacity: 1; transform: scale(1); }
}

.qr-animate {
    animation: qrReveal 0.4s cubic-bezier(0.34, 1.56, 0.64, 1) both;
}

/* === RESPONSIVE === */
@media (max-width: 700px) {
    .card-inner {
        grid-template-columns: 1fr;
    }

    .input-side {
        border-right: none;
        border-bottom: 1px solid var(--border);
    }

    .output-side {
        padding: 32px;
    }

    .uses-grid {
        grid-template-columns: 1fr 1fr;
    }

    .hero-title { font-size: 2rem; }
}

@media (max-width: 480px) {
    main { padding: 0 16px 60px; }

    .uses-grid { grid-template-columns: 1fr; }

    .btn-row { grid-template-columns: 1fr; }
}