/* ========================================
   SHIKAZIKA Landing Page - Pure CSS
   Converting Tailwind CSS to Pure CSS
   ======================================== */

/* ========================================
   1. CSS RESET & BASE STYLES
   ======================================== */

/* Import Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+JP:wght@400;700&display=swap');

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

/* Remove default margins and paddings */
* {
    margin: 0;
    padding: 0;
}

/* Base body styles */
body {
    font-family: 'Noto Sans JP', sans-serif;
    background-color: #fcfcfb;
    color: #333333;
    line-height: 1.6;
    position: relative;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Subtle noise texture for background depth */
.bg-noise::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 800 800"><defs><filter id="a" x="-20%" y="-20%" width="140%" height="140%" filterUnits="objectBoundingBox" primitiveUnits="userSpaceOnUse" color-interpolation-filters="linearRGB"><feTurbulence type="fractalNoise" baseFrequency="0.2" numOctaves="4" seed="15" stitchTiles="stitch" x="0%" y="0%" width="100%" height="100%" result="turbulence"/><feSpecularLighting surfaceScale="15" specularConstant=".75" specularExponent="20" lighting-color="%23FFF" x="0%" y="0%" width="100%" height="100%" in="turbulence" result="specularLighting"><feDistantLight azimuth="3" elevation="100"/></feSpecularLighting></filter></defs><rect width="100%" height="100%" fill="%23f7f7f5"/><rect width="100%" height="100%" fill="white" filter="url(%23a)" opacity="0.05"/></svg>');
    opacity: 0.5;
    z-index: -1;
}

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

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

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

svg {
    display: block;
}

/* ========================================
   2. LAYOUT UTILITIES
   ======================================== */

/* Container */
.container {
    width: 100%;
    max-width: 1280px;
    margin-left: auto;
    margin-right: auto;
}

/* Display utilities */
.block { display: block; }
.inline-block { display: inline-block; }
.inline { display: inline; }
.flex { display: flex; }
.inline-flex { display: inline-flex; }
.hidden { display: none; }

/* Flexbox utilities */
.flex-col { flex-direction: column; }
.flex-row { flex-direction: row; }
.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.justify-start { justify-content: flex-start; }
.flex-1 { flex: 1 1 0%; }
.flex-shrink-0 { flex-shrink: 0; }

/* Grid utilities */
.grid { display: grid; }
.grid-cols-1 { grid-template-columns: repeat(1, minmax(0, 1fr)); }
.grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }

/* Gap utilities */
.gap-4 { gap: 1rem; }
.gap-6 { gap: 1.5rem; }
.gap-8 { gap: 2rem; }
.gap-12 { gap: 3rem; }
.space-x-4 > * + * { margin-left: 1rem; }
.space-x-6 > * + * { margin-left: 1.5rem; }
.space-x-8 > * + * { margin-left: 2rem; }
.space-y-1 > * + * { margin-top: 0.25rem; }
.space-y-4 > * + * { margin-top: 1rem; }
.space-y-6 > * + * { margin-top: 1.5rem; }
.space-y-8 > * + * { margin-top: 2rem; }

/* Position utilities */
.relative { position: relative; }
.absolute { position: absolute; }
.fixed { position: fixed; }
.sticky { position: sticky; }

/* Z-index utilities */
.z-0 { z-index: 0; }
.z-10 { z-index: 10; }
.z-50 { z-index: 50; }

/* Top/Bottom/Left/Right */
.top-0 { top: 0; }
.bottom-0 { bottom: 0; }
.left-0 { left: 0; }
.right-0 { right: 0; }
.bottom-6 { bottom: 1.5rem; }
.right-6 { right: 1.5rem; }

/* Overflow */
.overflow-hidden { overflow: hidden; }

/* ========================================
   3. SPACING (Padding & Margin)
   ======================================== */

/* Padding utilities */
.p-1 { padding: 0.25rem; }
.p-2 { padding: 0.5rem; }
.p-4 { padding: 1rem; }
.p-6 { padding: 1.5rem; }
.p-8 { padding: 2rem; }

.px-2 { padding-left: 0.5rem; padding-right: 0.5rem; }
.px-3 { padding-left: 0.75rem; padding-right: 0.75rem; }
.px-4 { padding-left: 1rem; padding-right: 1rem; }
.px-5 { padding-left: 1.25rem; padding-right: 1.25rem; }
.px-6 { padding-left: 1.5rem; padding-right: 1.5rem; }
.px-8 { padding-left: 2rem; padding-right: 2rem; }
.px-10 { padding-left: 2.5rem; padding-right: 2.5rem; }
.px-12 { padding-left: 3rem; padding-right: 3rem; }

.py-1 { padding-top: 0.25rem; padding-bottom: 0.25rem; }
.py-2 { padding-top: 0.5rem; padding-bottom: 0.5rem; }
.py-3 { padding-top: 0.75rem; padding-bottom: 0.75rem; }
.py-4 { padding-top: 1rem; padding-bottom: 1rem; }
.py-12 { padding-top: 3rem; padding-bottom: 3rem; }
.py-20 { padding-top: 5rem; padding-bottom: 5rem; }

.pt-2 { padding-top: 0.5rem; }
.pt-4 { padding-top: 1rem; }
.pt-8 { padding-top: 2rem; }
.pb-4 { padding-bottom: 1rem; }
.pb-6 { padding-bottom: 1.5rem; }
.pl-8 { padding-left: 2rem; }

/* Margin utilities */
.m-0 { margin: 0; }
.mx-auto { margin-left: auto; margin-right: auto; }

.mt-1 { margin-top: 0.25rem; }
.mt-2 { margin-top: 0.5rem; }
.mt-4 { margin-top: 1rem; }
.mt-6 { margin-top: 1.5rem; }
.mt-8 { margin-top: 2rem; }
.mt-10 { margin-top: 2.5rem; }
.mt-auto { margin-top: auto; }

.mb-2 { margin-bottom: 0.5rem; }
.mb-3 { margin-bottom: 0.75rem; }
.mb-4 { margin-bottom: 1rem; }
.mb-6 { margin-bottom: 1.5rem; }
.mb-8 { margin-bottom: 2rem; }
.mb-10 { margin-bottom: 2.5rem; }
.mb-12 { margin-bottom: 3rem; }
.mb-16 { margin-bottom: 4rem; }
.mb-20 { margin-bottom: 5rem; }

.ml-4 { margin-left: 1rem; }
.mr-4 { margin-right: 1rem; }
.mr-8 { margin-right: 2rem; }

/* ========================================
   4. SIZING (Width & Height)
   ======================================== */

/* Width utilities */
.w-auto { width: auto; }
.w-full { width: 100%; }
.w-6 { width: 1.5rem; }
.w-7 { width: 1.75rem; }
.w-8 { width: 2rem; }
.w-10 { width: 2.5rem; }
.w-12 { width: 3rem; }
.w-16 { width: 4rem; }
.w-64 { width: 16rem; }
.w-80 { width: 20rem; }
.w-0\.5 { width: 0.125rem; }

/* Height utilities */
.h-auto { height: auto; }
.h-full { height: 100%; }
.h-6 { height: 1.5rem; }
.h-7 { height: 1.75rem; }
.h-8 { height: 2rem; }
.h-10 { height: 2.5rem; }
.h-12 { height: 3rem; }
.h-16 { height: 4rem; }
.h-64 { height: 16rem; }
.h-80 { height: 20rem; }

/* Max-width utilities */
.max-w-xl { max-width: 36rem; }
.max-w-2xl { max-width: 42rem; }
.max-w-3xl { max-width: 48rem; }
.max-w-4xl { max-width: 56rem; }

/* ========================================
   5. TYPOGRAPHY
   ======================================== */

/* Font size utilities */
.text-xs { font-size: 0.75rem; line-height: 1rem; }
.text-sm { font-size: 0.875rem; line-height: 1.25rem; }
.text-base { font-size: 1rem; line-height: 1.5rem; }
.text-lg { font-size: 1.125rem; line-height: 1.75rem; }
.text-xl { font-size: 1.25rem; line-height: 1.75rem; }
.text-2xl { font-size: 1.5rem; line-height: 2rem; }
.text-3xl { font-size: 1.875rem; line-height: 2.25rem; }
.text-4xl { font-size: 2.25rem; line-height: 2.5rem; }

/* Font weight utilities */
.font-medium { font-weight: 500; }
.font-semibold { font-weight: 600; }
.font-bold { font-weight: 700; }
.font-extrabold { font-weight: 800; }

/* Text alignment */
.text-left { text-align: left; }
.text-center { text-align: center; }

/* Line height */
.leading-relaxed { line-height: 1.625; }

/* Letter spacing */
.tracking-wider { letter-spacing: 0.05em; }

/* Text transform */
.uppercase { text-transform: uppercase; }

/* ========================================
   6. COLORS & BACKGROUNDS
   ======================================== */

/* Text colors */
.text-white { color: #ffffff; }
.text-gray-400 { color: #9ca3af; }
.text-gray-500 { color: #6b7280; }
.text-gray-600 { color: #4b5563; }
.text-gray-700 { color: #374151; }
.text-gray-800 { color: #1f2937; }
.text-\[\#2E2E2E\] { color: #2E2E2E; }
.text-\[\#5E5E5E\] { color: #5E5E5E; }
.text-\[\#555555\] { color: #555555; }
.text-\[\#84cc16\] { color: #84CC16; }
.text-\[\#84CC16\] { color: #84CC16; }
.text-\[\#65A30D\] { color: #65A30D; }
.text-\[\#4D7C0F\] { color: #4D7C0F; }
.text-\[\#6366F1\] { color: #6366F1; }
.text-\[\#625da5\] { color: #625da5; }
.text-\[\#45436c\] { color: #45436c; }
.text-\[\#de1e1e\] { color: #de1e1e; }
.text-white\/90 { color: rgba(255, 255, 255, 0.9); }

/* Background colors */
.bg-white { background-color: #ffffff; }
.bg-gray-50 { background-color: #f9fafb; }
.bg-gray-100 { background-color: #f3f4f6; }
.bg-gray-700 { background-color: #374151; }
.bg-\[\#2E2E2E\] { background-color: #2E2E2E; }
.bg-\[\#84cc16\] { background-color: #84CC16; }
.bg-\[\#84CC16\] { background-color: #84CC16; }
.bg-\[\#65A30D\] { background-color: #65A30D; }
.bg-\[\#6366F1\] { background-color: #6366F1; }
.bg-\[\#625da5\] { background-color: #625da5; }
.bg-\[\#BEE437\] { background-color: #BEE437; }
.bg-\[\#a9d134\] { background-color: #a9d134; }
.bg-\[\#EAFACC\] { background-color: #EAFACC; }
.bg-\[\#F5F5F4\] { background-color: #F5F5F4; }
.bg-\[\#fdefef\] { background-color: #fdefef; }
.bg-white\/60 { background-color: rgba(255, 255, 255, 0.6); }
.bg-white\/80 { background-color: rgba(255, 255, 255, 0.8); }
.bg-white\/95 { background-color: rgba(255, 255, 255, 0.95); }
.bg-gray-200 { background-color: #e5e7eb; }

/* Gradient backgrounds */
.bg-gradient-to-b { background-image: linear-gradient(to bottom, var(--tw-gradient-stops)); }
.bg-gradient-to-r { background-image: linear-gradient(to right, var(--tw-gradient-stops)); }
.from-\[\#625da5\] { --tw-gradient-from: #625da5; --tw-gradient-stops: var(--tw-gradient-from), var(--tw-gradient-to, rgba(98, 93, 165, 0)); }
.to-\[\#45436c\] { --tw-gradient-to: #45436c; }
.from-\[\#84CC16\] { --tw-gradient-from: #84CC16; --tw-gradient-stops: var(--tw-gradient-from), var(--tw-gradient-to, rgba(132, 204, 22, 0)); }
.to-\[\#4D7C0F\] { --tw-gradient-to: #4D7C0F; }

/* Specific gradient classes */
.bg-gradient-to-b.from-\[\#625da5\].to-\[\#45436c\] {
    background-image: linear-gradient(to bottom, #625da5, #45436c);
}
.bg-gradient-to-r.from-\[\#84CC16\].to-\[\#4D7C0F\] {
    background-image: linear-gradient(to right, #84CC16, #4D7C0F);
}

/* Background clip text for gradients */
.text-transparent { color: transparent; }
.bg-clip-text {
    -webkit-background-clip: text;
    background-clip: text;
}

/* Icon/circle backgrounds with opacity */
.bg-\[\#A3E635\]\/20 { background-color: rgba(163, 230, 53, 0.2); }
.bg-\[\#A3E635\]\/40 { background-color: rgba(163, 230, 53, 0.4); }
.bg-\[\#6366F1\]\/10 { background-color: rgba(99, 102, 241, 0.1); }
.bg-\[\#6366F1\]\/25 { background-color: rgba(99, 102, 241, 0.25); }

/* Section background colors */
.section-bg-light {
    background-color: #FEFEFE;
}

.section-bg-darker {
    background-image: linear-gradient(to bottom right, #ECFCCB, #E0E7FF);
}

.bg-pricing-gradient {
    background-image: linear-gradient(to bottom right, white, #ecece8);
}

/* Opacity utilities */
.opacity-60 { opacity: 0.6; }
.opacity-70 { opacity: 0.7; }

/* ========================================
   7. BORDERS & RADIUS
   ======================================== */

/* Border utilities */
.border { border-width: 1px; border-style: solid; }
.border-2 { border-width: 2px; border-style: solid; }
.border-4 { border-width: 4px; border-style: solid; }
.border-b { border-bottom-width: 1px; border-style: solid; }
.border-l-4 { border-left-width: 4px; }
.border-t { border-top-width: 1px; border-top-style: solid; }

/* Border colors */
.border-gray-200 { border-color: #e5e7eb; }
.border-gray-200\/80 { border-color: rgba(229, 231, 235, 0.8); }
.border-gray-300 { border-color: #d1d5db; }
.border-\[\#A3E635\] { border-color: #A3E635; }
.border-\[\#84cc16\] { border-color: #84CC16; }
.border-\[\#84CC16\] { border-color: #84CC16; }
.border-\[\#ffd3d3\] { border-color: #ffd3d3; }
.border-white\/20 { border-color: rgba(255, 255, 255, 0.2); }

/* Border radius utilities */
.rounded { border-radius: 0.25rem; }
.rounded-md { border-radius: 0.375rem; }
.rounded-lg { border-radius: 0.5rem; }
.rounded-xl { border-radius: 0.75rem; }
.rounded-2xl { border-radius: 1rem; }
.rounded-r-lg { border-top-right-radius: 0.5rem; border-bottom-right-radius: 0.5rem; }
.rounded-full { border-radius: 9999px; }

/* ========================================
   8. SHADOWS
   ======================================== */

.shadow-md {
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
}

.shadow-lg {
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

.shadow-xl {
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

/* Custom shadows */
.custom-shadow {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05), 0 2px 4px rgba(0, 0, 0, 0.04);
}

.custom-shadow-lg {
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.06), 0 5px 10px rgba(0, 0, 0, 0.04);
}

/* ========================================
   9. TRANSFORMS & TRANSITIONS
   ======================================== */

/* Transform utilities */
.transform { transform: translate(var(--tw-translate-x), var(--tw-translate-y)) rotate(var(--tw-rotate)) skewX(var(--tw-skew-x)) skewY(var(--tw-skew-y)) scaleX(var(--tw-scale-x)) scaleY(var(--tw-scale-y)); }

/* Translate utilities */
.-translate-x-1\/4 { transform: translateX(-25%); }
.-translate-y-1\/4 { transform: translateY(-25%); }
.translate-x-1\/4 { transform: translateX(25%); }
.translate-y-1\/4 { transform: translateY(25%); }
.-translate-x-1\/2 { transform: translateX(-50%); }
.-translate-y-1\/2 { transform: translateY(-50%); }
.-translate-y-0\.5 { transform: translateY(-0.125rem); }
.-translate-y-1 { transform: translateY(-0.25rem); }
.-translate-y-2 { transform: translateY(-0.5rem); }

/* Hover translate utilities */
.hover\:-translate-y-0\.5:hover { transform: translateY(-0.125rem) !important; }
.hover\:-translate-y-1:hover { transform: translateY(-0.25rem) !important; }
.hover\:-translate-y-2:hover { transform: translateY(-0.5rem) !important; }

/* Card hover animation - Direct approach */
.custom-shadow {
    transition: transform 0.2s ease-out !important;
}

.custom-shadow:hover {
    transform: translateY(-0.5rem) !important;
}

/* Blur utilities */
.blur-3xl { filter: blur(64px); }

/* Backdrop filter */
.backdrop-blur-lg { backdrop-filter: blur(16px); }

/* Transition utilities */
.transition-colors {
    transition-property: color, background-color, border-color, text-decoration-color, fill, stroke;
    transition-timing-function: cubic-bezier(0.4, 0, 0.2, 1);
    transition-duration: 300ms;
}

.transition-all {
    transition-property: all;
    transition-timing-function: cubic-bezier(0.4, 0, 0.2, 1);
    transition-duration: 300ms;
}

.transition-transform {
    transition-property: transform;
    transition-timing-function: cubic-bezier(0.4, 0, 0.2, 1);
    transition-duration: 300ms;
}

.duration-300 { transition-duration: 300ms; }

/* ========================================
   10. INTERACTIVE STATES (Hover, Focus)
   ======================================== */

/* Hover effects for text color */
.hover\:text-\[\#6366F1\]:hover { color: #6366F1; }
.hover\:text-white:hover { color: #ffffff; }

/* Hover effects for background color */
.hover\:bg-\[\#84cc16\]:hover { background-color: #84CC16; }
.hover\:bg-\[\#65A30D\]:hover { background-color: #65A30D; }
.hover\:bg-\[\#a9d134\]:hover { background-color: #a9d134; }
.hover\:bg-gray-200:hover { background-color: #e5e7eb; }
.hover\:bg-gray-700:hover { background-color: #374151; }

/* Hover transform effects */
.hover\:-translate-y-0\.5:hover { transform: translateY(-0.125rem); }
.hover\:-translate-y-1:hover { transform: translateY(-0.25rem); }
.hover\:-translate-y-2:hover { transform: translateY(-0.5rem); }

/* Focus utilities */
.focus\:outline-none:focus { outline: 2px solid transparent; outline-offset: 2px; }

/* ========================================
   11. HEADER COMPONENT
   ======================================== */

header {
    position: sticky;
    top: 0;
    z-index: 50;
    background-color: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(229, 231, 235, 0.8);
}

header .container {
    padding: 0.75rem 3rem 0.75rem 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

header img {
    height: 2rem;
    width: auto;
}

header nav {
    display: none;
    align-items: center;
}

header nav a {
    color: #4b5563;
    font-weight: 600;
    transition: color 0.3s ease;
    white-space: nowrap;
}

header nav a:hover {
    color: #6366F1;
}

#mobile-menu {
    position: absolute;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(16px);
    width: 100%;
}

#mobile-menu nav {
    padding: 0.5rem;
    padding-top: 0.5rem;
    padding-bottom: 1rem;
}

#mobile-menu nav a {
    display: block;
    padding: 0.5rem 0.75rem;
    border-radius: 0.375rem;
    font-size: 1rem;
    font-weight: 500;
    color: #374151;
    transition: all 0.3s ease;
}

#mobile-menu nav a:hover {
    color: #ffffff;
    background-color: #374151;
}

/* ========================================
   12. BUTTON STYLES
   ======================================== */

.btn-arrow-icon {
    display: inline-flex;
    align-items: center;
    white-space: nowrap;
}

.btn-arrow-icon::after {
    content: '';
    display: inline-block;
    width: 1.25rem;
    height: 1.25rem;
    margin-left: 0.5rem;
    vertical-align: middle;
    background-color: currentColor;
    border-radius: 50%;
    -webkit-mask-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="white" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><circle cx="12" cy="12" r="10"/><path d="m12 16 4-4-4-4"/><path d="M8 12h8"/></svg>');
    mask-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="white" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><circle cx="12" cy="12" r="10"/><path d="m12 16 4-4-4-4"/><path d="M8 12h8"/></svg>');
    -webkit-mask-size: contain;
    mask-size: contain;
    -webkit-mask-repeat: no-repeat;
    mask-repeat: no-repeat;
    -webkit-mask-position: center;
    mask-position: center;
    transition: transform 0.2s ease-in-out;
}

.btn-arrow-icon:hover::after {
    transform: translateX(2px);
}

/* Button styles - Login button with border */
.btn-arrow-icon.bg-white {
    background-color: white !important;
    color: #84cc16 !important;
    border: 2px solid #84cc16 !important;
}

.btn-arrow-icon.bg-white:hover {
    background-color: #84cc16 !important;
    color: white !important;
    border-color: #84cc16 !important;
}

/* ========================================
   13. HEADING DECORATIVE UNDERLINE
   ======================================== */

.heading-underline {
    position: relative;
    display: inline-block;
}

.heading-underline::after {
    content: '';
    position: absolute;
    bottom: -12px;
    left: 50%;
    transform: translateX(-50%);
    width: 50%;
    height: 4px;
    background-image: linear-gradient(90deg, #A3E635, #65A30D);
    border-radius: 2px;
    opacity: 0.8;
}

/* ========================================
   14. SCROLL ANIMATIONS
   ======================================== */

.scroll-animate {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

.scroll-animate.is-visible {
    opacity: 1;
    transform: translateY(0);
}

/* ========================================
   15. ACCORDION (FAQ)
   ======================================== */

.accordion-toggle {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    text-align: left;
    padding: 1.5rem;
}

.accordion-icon {
    font-size: 1.5rem;
    color: #6b7280;
    transform: rotate(0deg);
    transition: transform 0.3s ease;
}

.accordion-toggle.active .accordion-icon {
    transform: rotate(45deg);
}

.accordion-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out;
}

/* ========================================
   16. VIDEO CONTAINER
   ======================================== */

.video-container {
    position: relative;
    overflow: hidden;
    padding-bottom: 56.25%; /* 16:9 aspect ratio */
}

.video-container iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

/* ========================================
   17. BACK TO TOP BUTTON
   ======================================== */

#back-to-top {
    position: fixed;
    bottom: 1.5rem;
    right: 1.5rem;
    background-color: #84CC16;
    color: white;
    width: 3rem;
    height: 3rem;
    border-radius: 9999px;
    display: flex;
    justify-content: center;
    align-items: center;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    transition: all 0.3s ease;
    z-index: 50;
}

#back-to-top:hover {
    background-color: #65A30D;
}

/* ========================================
   18. RESPONSIVE BREAKPOINTS
   ======================================== */

/* Small devices (640px and up) */
@media (min-width: 640px) {
    .sm\:block { display: block; }
    .sm\:hidden { display: none; }
    .sm\:w-auto { width: auto; }
    .sm\:flex-row { flex-direction: row; }
    .sm\:px-3 { padding-left: 0.75rem; padding-right: 0.75rem; }
    .sm\:mt-0 { margin-top: 0; }
    .sm\:ml-4 { margin-left: 1rem; }
}

/* Medium devices (768px and up) */
@media (min-width: 768px) {
    .md\:grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .md\:grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .md\:grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
    .md\:flex-row { flex-direction: row; }
    .md\:text-left { text-align: left; }
    .md\:text-3xl { font-size: 1.875rem; line-height: 2.25rem; }
    .md\:text-4xl { font-size: 2.25rem; line-height: 2.5rem; }
    .md\:text-\[2\.75rem\] { font-size: 2.75rem; }
    .md\:py-28 { padding-top: 7rem; padding-bottom: 7rem; }
    .md\:h-10 { height: 2.5rem; }
    .md\:px-24 { padding-left: 6rem; padding-right: 6rem; }
}

/* Large devices (1024px and up) */
@media (min-width: 1024px) {
    .lg\:w-1\/2 { width: 50%; }
    .lg\:w-5\/12 { width: 41.666667%; }
    .lg\:w-6\/12 { width: 50%; }
    .lg\:flex-row { flex-direction: row; }
    .lg\:gap-16 { gap: 4rem; }
    .lg\:gap-20 { gap: 5rem; }
    .lg\:text-left { text-align: left; }
    .lg\:justify-start { justify-content: flex-start; }
    .lg\:mx-0 { margin-left: 0; margin-right: 0; }
    .lg\:mt-0 { margin-top: 0; }
    .lg\:-ml-40 { margin-left: -10rem; }
    .lg\:translate-x-16 { transform: translateX(4rem); }
    .lg\:scale-150 { transform: scale(1.5); }
    .lg\:grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .lg\:grid-cols-7 { grid-template-columns: repeat(7, minmax(0, 1fr)); }
}

/* Extra large devices (1280px and up) */
@media (min-width: 1280px) {
    .xl\:flex { display: flex; }
    .xl\:hidden { display: none; }
}

/* ========================================
   19. MOBILE MENU BUTTON
   ======================================== */

#mobile-menu-button {
    color: #4b5563;
    transition: color 0.3s ease;
}

#mobile-menu-button:hover {
    color: #6366F1;
}

#mobile-menu-button:focus {
    outline: 2px solid transparent;
    outline-offset: 2px;
}

/* Show nav items on xl screens */
@media (min-width: 1280px) {
    header nav {
        display: flex;
        gap: 2rem;
    }

    header nav > * + * {
        margin-left: 2rem;
    }
}

/* ========================================
   20. UTILITY CLASSES FOR SPECIFIC ELEMENTS
   ======================================== */

/* Line height for hero title */
[style*="line-height: 1.5"] {
    line-height: 1.5;
}

/* Decorative blur circles */
.absolute.top-0.left-0.w-64.h-64 {
    position: absolute;
    top: 0;
    left: 0;
    width: 16rem;
    height: 16rem;
    border-radius: 9999px;
    transform: translate(-25%, -25%);
    filter: blur(64px);
    opacity: 0.7;
    z-index: 0;
}

.absolute.bottom-0.right-0.w-80.h-80 {
    position: absolute;
    bottom: 0;
    right: 0;
    width: 20rem;
    height: 20rem;
    border-radius: 9999px;
    transform: translate(25%, 25%);
    filter: blur(64px);
    opacity: 0.7;
    z-index: 0;
}

/* Vertical line for implementation flow */
.absolute.left-6.w-0\.5.h-full.bg-green-200 {
    position: absolute;
    left: 1.5rem;
    width: 0.125rem;
    height: 100%;
    background-color: #bbf7d0;
}

/* Specific width classes */
.w-5\/12 {
    width: 41.666667%;
}

.w-6\/12 {
    width: 50%;
}

/* Specific height classes */
.h-12 {
    height: 3rem;
}

.h-16 {
    height: 4rem;
}

/* ========================================
   21. SVG ICON SIZING
   ======================================== */

svg.w-5 { width: 1.25rem; }
svg.h-5 { height: 1.25rem; }
svg.w-6 { width: 1.5rem; }
svg.h-6 { height: 1.5rem; }
svg.w-7 { width: 1.75rem; }
svg.h-7 { height: 1.75rem; }
svg.w-8 { width: 2rem; }
svg.h-8 { height: 2rem; }

/* SVG stroke width */
svg[stroke-width="2"] { stroke-width: 2; }
svg[stroke-width="3"] { stroke-width: 3; }

/* SVG stroke properties */
svg[stroke-linecap="round"] { stroke-linecap: round; }
svg[stroke-linejoin="round"] { stroke-linejoin: round; }

/* ========================================
   22. ADDITIONAL UTILITY CLASSES
   ======================================== */

/* Text decoration */
.hover\:text-white:hover {
    color: #ffffff;
}

/* Specific spacing for mobile buttons */
.space-y-1 > * + * {
    margin-top: 0.25rem;
}

/* Alert/notice box styling */
.bg-\[\#fdefef\].border-l-4.border-\[\#ffd3d3\] {
    background-color: #fdefef;
    border-left-width: 4px;
    border-left-color: #ffd3d3;
    padding: 1rem;
    border-radius: 0 0.5rem 0.5rem 0;
}

/* Aria hidden utility */
[aria-hidden="true"] {
    display: block;
}

/* List utilities */
.list-none {
    list-style-type: none;
}

/* Padding utilities for lists */
.p-0 {
    padding: 0;
}

/* ========================================
   23. RESPONSIVE UTILITIES - MOBILE MENU
   ======================================== */

@media (max-width: 1279px) {
    #mobile-menu.hidden {
        display: none;
    }
}

@media (min-width: 1280px) {
    #mobile-menu {
        display: none !important;
    }
}

/* ========================================
   24. CUSTOM COMPONENT STYLES
   ======================================== */

/* Partner logo styling */
section img[alt*="滋賀県産業支援プラザ"] {
    height: 2rem;
}

@media (min-width: 768px) {
    section img[alt*="滋賀県産業支援プラザ"] {
        height: 2.5rem;
    }
}

/* Solution card specific heights */
.flex.flex-col.h-full {
    display: flex;
    flex-direction: column;
    height: 100%;
}

/* Pricing card recommended badge positioning */
.absolute.top-0.-translate-y-1\/2.left-1\/2.-translate-x-1\/2 {
    position: absolute;
    top: 0;
    left: 50%;
    transform: translate(-50%, -50%);
}

/* Footer link hover effects */
footer a {
    transition: color 0.3s ease;
}

footer a:hover {
    color: #ffffff;
}

/* ========================================
   25. PRINT STYLES
   ======================================== */

@media print {
    header {
        position: static;
    }

    #back-to-top,
    #mobile-menu-button {
        display: none;
    }
}

/* ========================================
   26. ACCESSIBILITY ENHANCEMENTS
   ======================================== */

/* Focus visible for keyboard navigation */
a:focus-visible,
button:focus-visible {
    outline: 2px solid #6366F1;
    outline-offset: 2px;
}

/* Reduced motion support */
@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;
    }
}