/* ==========================================================================
   QR Code Generator — Pro Typography, Fluid Responsiveness & Micro-Animations
   Font: Plus Jakarta Sans & JetBrains Mono
   Theme: Easy-on-the-Eyes Ambient Slate & Electric Mint Glassmorphism
   Zero Purple · Zero Pitch-Black · Zero Warping
   ========================================================================== */

/* --------------------------------------------------------------------------
   Design Tokens & System Variables
   -------------------------------------------------------------------------- */
:root {
    /* Atmospheric Base & Canvas */
    --bg-base: #0f172a;
    --card-glass: rgba(255, 255, 255, 0.05);
    --card-glass-hover: rgba(255, 255, 255, 0.08);
    --input-glass: rgba(15, 23, 42, 0.65);
    --input-glass-focus: rgba(15, 23, 42, 0.9);

    /* Glass Borders & Specular Highlights */
    --border-glass: rgba(255, 255, 255, 0.12);
    --border-glass-hover: rgba(255, 255, 255, 0.22);
    --border-glass-focus: rgba(52, 211, 153, 0.6);
    --glass-shine: inset 0 1px 1px rgba(255, 255, 255, 0.15);

    /* Professional High-Contrast Typography */
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    --text-inverse: #022c22;

    /* Primary Accent (Electric Emerald Mint) */
    --accent: #10b981;
    --accent-hover: #34d399;
    --accent-glow: rgba(16, 185, 129, 0.28);
    --accent-glass: rgba(16, 185, 129, 0.12);
    --accent-border: rgba(52, 211, 153, 0.35);

    /* PDF Sky Blue Accent */
    --pdf-accent: #38bdf8;
    --pdf-accent-hover: #7dd3fc;
    --pdf-glass: rgba(56, 189, 248, 0.12);
    --pdf-border: rgba(56, 189, 248, 0.35);

    /* Radii */
    --radius-xs: 6px;
    --radius-sm: 10px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --radius-xl: 26px;

    /* Depth Shadows */
    --shadow-glass: 0 20px 50px -12px rgba(0, 0, 0, 0.45), var(--glass-shine);
    --shadow-hover: 0 25px 60px -12px rgba(0, 0, 0, 0.55), var(--glass-shine);

    /* Pro Typography Stack */
    --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', 'SF Mono', Consolas, monospace;

    /* Animation Timing */
    --ease-spring: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-bounce: cubic-bezier(0.34, 1.56, 0.64, 1);
    --ease-smooth: cubic-bezier(0.4, 0, 0.2, 1);
}

/* --------------------------------------------------------------------------
   Reset & Fluid Base
   -------------------------------------------------------------------------- */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    -webkit-tap-highlight-color: transparent;
}

a,
button,
input,
textarea,
select,
summary,
[role="button"] {
    -webkit-tap-highlight-color: transparent;
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
    font-feature-settings: "cv02", "cv03", "cv04", "cv11";
}

/* Custom Sleek Scrollbar */
html {
    scrollbar-width: thin;
    scrollbar-color: rgba(52, 211, 153, 0.35) transparent;
}

::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.14);
    border-radius: 999px;
    transition: background 0.2s ease;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(52, 211, 153, 0.5);
}

/* ==========================================================================
   Ambient Atmospheric Background
   ========================================================================== */
body {
    background-color: var(--bg-base);
    background-image:
        radial-gradient(at 15% 15%, rgba(16, 185, 129, 0.12) 0px, transparent 45%),
        radial-gradient(at 85% 20%, rgba(56, 189, 248, 0.1) 0px, transparent 45%),
        radial-gradient(at 50% 90%, rgba(30, 41, 59, 0.8) 0px, transparent 60%),
        linear-gradient(145deg, #0b1120 0%, #0f172a 45%, #0f2425 100%);
    background-attachment: fixed;
    color: var(--text-primary);
    font-family: var(--font-sans);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: clamp(1.5rem, 4vw, 3rem) clamp(1rem, 3.5vw, 1.75rem);
    position: relative;
    overflow-x: hidden;
}

/* Ambient Floating Orbs */
body::before,
body::after {
    content: '';
    position: fixed;
    border-radius: 50%;
    filter: blur(100px);
    pointer-events: none;
    z-index: -1;
    opacity: 0.65;
    will-change: transform, opacity;
}

body::before {
    width: clamp(320px, 45vw, 550px);
    height: clamp(320px, 45vw, 550px);
    background: radial-gradient(circle, rgba(16, 185, 129, 0.18), transparent 70%);
    top: -80px;
    left: -80px;
    animation: floatOrb1 22s ease-in-out infinite alternate;
}

body::after {
    width: clamp(300px, 40vw, 500px);
    height: clamp(300px, 40vw, 500px);
    background: radial-gradient(circle, rgba(56, 189, 248, 0.14), transparent 70%);
    bottom: -80px;
    right: -80px;
    animation: floatOrb2 25s ease-in-out infinite alternate;
}

@keyframes floatOrb1 {
    0% {
        transform: translate(0, 0) scale(1);
    }

    50% {
        transform: translate(40px, 30px) scale(1.06);
    }

    100% {
        transform: translate(-20px, 45px) scale(0.96);
    }
}

@keyframes floatOrb2 {
    0% {
        transform: translate(0, 0) scale(1);
    }

    50% {
        transform: translate(-35px, -25px) scale(1.08);
    }

    100% {
        transform: translate(25px, -35px) scale(0.95);
    }
}

/* ==========================================================================
   Layout Shell & Fluid Proportions
   ========================================================================== */
.app-shell {
    width: 100%;
    max-width: 600px;
    margin: 0 auto;
}

/* Header Section */
.app-header {
    text-align: center;
    margin-bottom: clamp(1.5rem, 3.5vw, 2.25rem);
    animation: fadeInUp 0.5s var(--ease-spring) both;
}

.brand-icon {
    width: clamp(48px, 6vw, 56px);
    height: clamp(48px, 6vw, 56px);
    background: rgba(16, 185, 129, 0.15);
    border: 1px solid rgba(52, 211, 153, 0.3);
    border-radius: var(--radius-md);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: var(--accent-hover);
    margin-bottom: 1rem;
    box-shadow: 0 8px 24px var(--accent-glow), var(--glass-shine);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    transition: transform 0.3s var(--ease-bounce), box-shadow 0.3s ease;
}

.brand-icon:hover {
    transform: translateY(-2px) scale(1.05);
    box-shadow: 0 12px 30px rgba(16, 185, 129, 0.35), var(--glass-shine);
}

.brand-icon svg {
    width: 26px;
    height: 26px;
    fill: currentColor;
}

.app-header h1 {
    font-size: clamp(1.65rem, 4vw + 0.4rem, 2.15rem);
    font-weight: 800;
    letter-spacing: -0.035em;
    line-height: 1.25;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.25);
}

.app-header p {
    font-size: clamp(0.92rem, 1.5vw + 0.4rem, 1.02rem);
    color: var(--text-secondary);
    max-width: 440px;
    margin: 0 auto;
    line-height: 1.55;
}

/* ==========================================================================
   Glassmorphic Card Panel & Interactive Micro-Animations
   ========================================================================== */
.main-card {
    background: var(--card-glass);
    backdrop-filter: blur(28px);
    -webkit-backdrop-filter: blur(28px);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-xl);
    padding: clamp(1.35rem, 3.8vw, 2.25rem);
    box-shadow: var(--shadow-glass);
    transition: border-color 0.3s ease, box-shadow 0.3s ease, transform 0.3s ease;
    animation: fadeInUp 0.55s var(--ease-spring) 0.08s both;
}

.main-card:hover {
    border-color: var(--border-glass-hover);
    box-shadow: var(--shadow-hover);
}

/* Form Structure */
.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.82rem;
    font-weight: 700;
    color: var(--text-secondary);
    margin-bottom: 0.65rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.char-counter {
    font-family: var(--font-mono);
    font-size: 0.76rem;
    color: var(--text-muted);
    font-variant-numeric: tabular-nums;
}

/* Input Area (16px base font prevents iOS auto-zoom) */
.input-field {
    width: 100%;
    padding: 1.05rem 1.25rem;
    background: var(--input-glass);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: 1rem;
    outline: none;
    transition: all 0.25s var(--ease-smooth);
    resize: vertical;
    min-height: 125px;
    line-height: 1.6;
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.2);
}

.input-field:hover {
    border-color: var(--border-glass-hover);
    background: rgba(15, 23, 42, 0.72);
}

.input-field:focus {
    background: var(--input-glass-focus);
    border-color: var(--border-glass-focus);
    box-shadow: 0 0 0 3px var(--accent-glow), inset 0 2px 4px rgba(0, 0, 0, 0.2);
    transform: translateY(-1px);
}

.input-field::placeholder {
    color: var(--text-muted);
    font-weight: 400;
}

.input-error-shake {
    animation: shakeInput 0.4s cubic-bezier(0.36, 0.07, 0.19, 0.97) both;
    border-color: #f43f5e !important;
    box-shadow: 0 0 0 3px rgba(244, 63, 94, 0.3) !important;
}

@keyframes shakeInput {

    10%,
    90% {
        transform: translate3d(-2px, 0, 0);
    }

    20%,
    80% {
        transform: translate3d(3px, 0, 0);
    }

    30%,
    50%,
    70% {
        transform: translate3d(-5px, 0, 0);
    }

    40%,
    60% {
        transform: translate3d(5px, 0, 0);
    }
}

/* ==========================================================================
   Buttons with Shimmer Sweep & Tactile Feedback
   ========================================================================== */
.btn-primary {
    width: 100%;
    min-height: 48px;
    padding: 0.95rem 1.5rem;
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
    color: #ffffff;
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-md);
    font-family: var(--font-sans);
    font-size: 1rem;
    font-weight: 700;
    letter-spacing: -0.01em;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.65rem;
    position: relative;
    overflow: hidden;
    transition: all 0.25s var(--ease-spring);
    box-shadow: 0 6px 22px var(--accent-glow), var(--glass-shine);
    text-decoration: none;
}

/* Shimmer Light Sweep on Hover */
.btn-primary::after {
    content: '';
    position: absolute;
    top: 0;
    left: -120%;
    width: 60%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.25), transparent);
    transform: skewX(-20deg);
    transition: left 0.65s ease;
}

.btn-primary:hover {
    background: linear-gradient(135deg, #34d399 0%, #10b981 100%);
    transform: translateY(-2px);
    box-shadow: 0 10px 28px rgba(16, 185, 129, 0.4), var(--glass-shine);
}

.btn-primary:hover::after {
    left: 150%;
}

.btn-primary:active {
    transform: translateY(0) scale(0.985);
    box-shadow: 0 4px 14px var(--accent-glow);
}

.btn-primary svg {
    width: 20px;
    height: 20px;
    fill: currentColor;
    transition: transform 0.25s ease;
}

.btn-primary:hover svg {
    transform: rotate(6deg) scale(1.08);
}

/* ==========================================================================
   Result Page — QR Viewfinder & Download Actions
   ========================================================================== */
.top-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1.5rem;
    animation: fadeInUp 0.4s var(--ease-spring) both;
}

.back-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    min-height: 42px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.88rem;
    font-weight: 600;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-glass);
    background: var(--card-glass);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    transition: all 0.2s var(--ease-smooth);
    box-shadow: var(--glass-shine);
}

.back-btn:hover {
    color: var(--text-primary);
    border-color: var(--border-glass-hover);
    background: var(--card-glass-hover);
    transform: translateX(-3px);
}

.back-btn svg {
    width: 16px;
    height: 16px;
    fill: currentColor;
    transition: transform 0.2s ease;
}

.back-btn:hover svg {
    transform: translateX(-2px);
}

/* QR Showcase Card */
.qr-display-card {
    text-align: center;
}

/* Strict 1:1 QR Centerpiece with Reveal Animation */
.qr-frame {
    background: #ffffff;
    width: min(260px, 100%);
    aspect-ratio: 1 / 1;
    margin: 0 auto 1.5rem;
    padding: 12px;
    border-radius: var(--radius-lg);
    box-shadow:
        0 18px 40px rgba(0, 0, 0, 0.38),
        0 0 0 1px rgba(255, 255, 255, 0.35);
    display: flex;
    align-items: center;
    justify-content: center;
    animation: qrReveal 0.55s var(--ease-bounce) 0.15s both;
    position: relative;
    overflow: hidden;
}

@keyframes qrReveal {
    from {
        opacity: 0;
        transform: scale(0.9) translateY(10px);
    }

    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

#qrcode {
    width: 100% !important;
    height: 100% !important;
    aspect-ratio: 1 / 1 !important;
    display: flex !important;
    align-items: center !important;
    justify-content: center !important;
}

/* Hide duplicate canvas generated by qrcode.js */
#qrcode canvas {
    display: none !important;
}

/* Pure 1:1 Sharp Image */
#qrcode img {
    display: block !important;
    width: 100% !important;
    height: 100% !important;
    aspect-ratio: 1 / 1 !important;
    object-fit: contain !important;
    image-rendering: -webkit-optimize-contrast;
    image-rendering: crisp-edges;
    image-rendering: pixelated;
}

/* Payload Glass Box */
.payload-box {
    background: var(--input-glass);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-md);
    padding: 0.85rem 1.15rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
    text-align: left;
    box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.2);
}

.payload-text {
    flex: 1;
    min-width: 0;
    font-family: var(--font-mono);
    font-size: 0.86rem;
    color: var(--text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.copy-btn {
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid var(--border-glass);
    color: var(--text-secondary);
    min-height: 36px;
    padding: 6px 13px;
    border-radius: var(--radius-sm);
    font-family: var(--font-sans);
    font-size: 0.8rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: all 0.2s var(--ease-smooth);
    flex-shrink: 0;
    backdrop-filter: blur(8px);
}

.copy-btn:hover {
    color: var(--accent-hover);
    border-color: var(--accent-border);
    background: var(--accent-glass);
    transform: translateY(-1px);
}

.copy-btn:active {
    transform: scale(0.96);
}

.copy-btn.is-copied {
    color: var(--accent-hover);
    border-color: var(--accent);
    background: var(--accent-glass);
}

.copy-btn svg {
    width: 14px;
    height: 14px;
    fill: currentColor;
}

/* Download Actions Grid */
.download-actions {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-bottom: 1.25rem;
}

.btn-download {
    min-height: 50px;
    padding: 0.95rem 1.25rem;
    border-radius: var(--radius-md);
    font-family: var(--font-sans);
    font-size: 0.94rem;
    font-weight: 700;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.6rem;
    transition: all 0.25s var(--ease-spring);
    border: 1px solid transparent;
    text-decoration: none;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    position: relative;
    overflow: hidden;
}

.btn-download svg {
    width: 18px;
    height: 18px;
    fill: currentColor;
    transition: transform 0.2s ease;
}

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

.btn-download--png {
    background: var(--accent-glass);
    border-color: var(--accent-border);
    color: var(--accent-hover);
    box-shadow: 0 4px 14px rgba(16, 185, 129, 0.15), var(--glass-shine);
}

.btn-download--png:hover {
    background: var(--accent);
    color: #ffffff;
    box-shadow: 0 10px 26px var(--accent-glow), var(--glass-shine);
    transform: translateY(-3px);
}

.btn-download--pdf {
    background: var(--pdf-glass);
    border-color: var(--pdf-border);
    color: var(--pdf-accent);
    box-shadow: 0 4px 14px rgba(56, 189, 248, 0.15), var(--glass-shine);
}

.btn-download--pdf:hover {
    background: var(--pdf-accent);
    color: #0b1329;
    box-shadow: 0 10px 26px rgba(56, 189, 248, 0.38), var(--glass-shine);
    transform: translateY(-3px);
}

.btn-download:active {
    transform: translateY(0) scale(0.98);
}

/* Secondary Button */
.btn-secondary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.55rem;
    width: 100%;
    min-height: 46px;
    padding: 0.85rem 1.25rem;
    background: rgba(255, 255, 255, 0.03);
    color: var(--text-muted);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-md);
    font-family: var(--font-sans);
    font-size: 0.9rem;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.2s ease;
    backdrop-filter: blur(8px);
}

.btn-secondary:hover {
    color: var(--text-primary);
    border-color: var(--border-glass-hover);
    background: var(--card-glass-hover);
    transform: translateY(-1px);
}

.btn-secondary:active {
    transform: scale(0.985);
}

.btn-secondary svg {
    width: 16px;
    height: 16px;
    fill: currentColor;
}

/* ==========================================================================
   SEO Informational Sections & Rich Snippet Content
   ========================================================================== */
.seo-content-section {
    margin-top: clamp(2.5rem, 5vw, 4rem);
    display: flex;
    flex-direction: column;
    gap: 1.75rem;
    width: 100%;
    animation: fadeInUp 0.5s var(--ease-spring) 0.18s both;
}

.seo-card {
    background: var(--card-glass);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-xl);
    padding: clamp(1.35rem, 4vw, 2.25rem);
    box-shadow: var(--shadow-glass);
    transition: border-color 0.3s ease, box-shadow 0.3s ease, transform 0.3s ease;
}

.seo-card:hover {
    border-color: var(--border-glass-hover);
    box-shadow: var(--shadow-hover);
}

.seo-card h2 {
    font-size: clamp(1.15rem, 2vw + 0.5rem, 1.35rem);
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 1.25rem;
    display: flex;
    align-items: center;
    gap: 0.65rem;
    letter-spacing: -0.025em;
}

.seo-card h2 svg {
    width: 22px;
    height: 22px;
    fill: var(--accent-hover);
    flex-shrink: 0;
}

/* Steps List */
.steps-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.step-item {
    display: flex;
    align-items: flex-start;
    gap: 1.1rem;
}

.step-num {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--accent-glass);
    border: 1px solid var(--accent-border);
    color: var(--accent-hover);
    font-family: var(--font-mono);
    font-weight: 800;
    font-size: 0.88rem;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    margin-top: 2px;
    box-shadow: 0 2px 8px var(--accent-glow);
}

.step-info h3 {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.step-info p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.55;
}

/* Features Grid */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
    gap: 1rem;
}

.feature-box {
    background: var(--input-glass);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-md);
    padding: 1.25rem;
    transition: all 0.25s var(--ease-smooth);
}

.feature-box:hover {
    border-color: var(--border-glass-hover);
    transform: translateY(-2px);
    background: rgba(15, 23, 42, 0.8);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.25);
}

.feature-box h3 {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.4rem;
    display: flex;
    align-items: center;
    gap: 0.55rem;
}

.feature-box h3 svg {
    width: 17px;
    height: 17px;
    fill: var(--accent-hover);
    flex-shrink: 0;
}

.feature-box p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.55;
}

/* FAQ Accordions with Smooth Chevron Animation */
.faq-list {
    display: flex;
    flex-direction: column;
    gap: 0.85rem;
}

.faq-item {
    background: var(--input-glass);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: border-color 0.25s ease, background 0.25s ease;
}

.faq-item[open] {
    border-color: var(--accent-border);
    background: rgba(15, 23, 42, 0.8);
}

.faq-question {
    padding: 1.1rem 1.25rem;
    font-size: 0.94rem;
    font-weight: 700;
    color: var(--text-primary);
    cursor: pointer;
    list-style: none;
    display: flex;
    align-items: center;
    justify-content: space-between;
    user-select: none;
    min-height: 48px;
    transition: color 0.2s ease;
}

.faq-question:hover {
    color: var(--accent-hover);
}

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

.faq-question::after {
    content: '+';
    font-family: var(--font-mono);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--accent-hover);
    transition: transform 0.25s var(--ease-spring);
    line-height: 1;
}

.faq-item[open] .faq-question::after {
    transform: rotate(45deg);
    color: var(--text-muted);
}

.faq-answer {
    padding: 0 1.25rem 1.25rem 1.25rem;
    font-size: 0.88rem;
    color: var(--text-secondary);
    line-height: 1.65;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    padding-top: 0.85rem;
    animation: accordionFade 0.25s ease-out;
}

@keyframes accordionFade {
    from {
        opacity: 0;
        transform: translateY(-4px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* SEO Footer */
.seo-footer {
    margin-top: clamp(2.5rem, 5vw, 3.5rem);
    padding-top: 2rem;
    border-top: 1px solid var(--border-glass);
    text-align: center;
    color: var(--text-muted);
    font-size: 0.82rem;
    display: flex;
    flex-direction: column;
    gap: 0.45rem;
}

/* Toast Notification */
.toast-msg {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%) translateY(24px);
    background: rgba(15, 23, 42, 0.92);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-glass-hover);
    color: var(--text-primary);
    padding: 0.85rem 1.5rem;
    border-radius: var(--radius-sm);
    font-family: var(--font-sans);
    font-size: 0.88rem;
    font-weight: 600;
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.55), var(--glass-shine);
    opacity: 0;
    pointer-events: none;
    transition: all 0.3s var(--ease-spring);
    display: flex;
    align-items: center;
    gap: 0.6rem;
    z-index: 100;
    white-space: nowrap;
}

.toast-msg.is-active {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

.toast-msg svg {
    width: 16px;
    height: 16px;
    fill: var(--accent-hover);
}

.toast-msg--error svg {
    fill: #f43f5e;
}

/* ==========================================================================
   Global Keyframe Animations
   ========================================================================== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(18px) scale(0.985);
    }

    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

/* ==========================================================================
   Responsive Adaptations
   ========================================================================== */
@media (max-width: 640px) {
    body {
        padding: 1.25rem 0.85rem;
        justify-content: flex-start;
    }

    .main-card {
        border-radius: var(--radius-lg);
    }

    .download-actions {
        grid-template-columns: 1fr;
    }

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

    .qr-frame {
        width: min(280px, 100%);
        padding: 10px;
    }
}

@media (max-width: 360px) {
    .qr-frame {
        width: min(240px, 100%);
        padding: 8px;
    }

    .app-header h1 {
        font-size: 1.5rem;
    }
}