/*
Theme Name: NAKANO会計事務所
Theme URI: https://nakano-accounting.example.com
Author: NextCatalyst LLC
Author URI: https://nextcatalyst.example.com
Description: A professional custom theme for NAKANO会計事務所 - a tax accounting firm in Shinjuku, Tokyo. Built with ACF + custom templates.
Version: 1.0.0
Requires at least: 6.0
Tested up to: 6.9
Requires PHP: 8.0
License: GNU General Public License v2 or later
License URI: https://www.gnu.org/licenses/gpl-2.0.html
Text Domain: nakano-accounting
Tags: custom-theme, accounting, tax, professional, acf
*/

/* ============================================================
   CSS Custom Properties
============================================================ */
:root {
    --na-primary:        #1B2A4A;
    --na-primary-light:  #2C4470;
    --na-primary-dark:   #0F1B32;
    --na-accent:         #C8A45C;
    --na-accent-hover:   #B8943C;
    --na-accent-light:   rgba(200, 164, 92, 0.12);
    --na-white:          #FFFFFF;
    --na-off-white:      #F8F9FA;
    --na-light-gray:     #F0F2F5;
    --na-text:           #2D3748;
    --na-text-muted:     #718096;
    --na-text-light:     #A0AEC0;
    --na-border:         rgba(27, 42, 74, 0.1);
    --na-border-dark:    rgba(27, 42, 74, 0.2);
    --na-success:        #48BB78;
    --na-radius-sm:      6px;
    --na-radius-md:      10px;
    --na-radius-lg:      16px;
    --na-radius-xl:      20px;
    --na-shadow-sm:      0 1px 3px rgba(0, 0, 0, 0.06);
    --na-shadow-card:    0 4px 20px rgba(0, 0, 0, 0.06);
    --na-shadow-card-hover: 0 12px 40px rgba(0, 0, 0, 0.1);
    --na-shadow-lg:      0 8px 32px rgba(0, 0, 0, 0.1);
    --na-transition:     0.3s ease;
    --na-container:      1100px;
    --na-header-height:  80px;
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: calc(var(--na-header-height) + 16px);
    font-size: 16px;
}

body {
    font-family: 'Noto Sans JP', 'Hiragino Kaku Gothic ProN', 'Hiragino Sans', 'YuGothic', 'Yu Gothic', sans-serif;
    background-color: var(--na-white);
    color: var(--na-text);
    line-height: 1.8;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

a {
    color: var(--na-primary);
    text-decoration: none;
    transition: color var(--na-transition);
}

a:hover {
    color: var(--na-accent);
}

ul {
    list-style: none;
}

/* ============================================================
   Typography
============================================================ */
h1, h2, h3, h4, h5, h6 {
    font-family: 'Noto Serif JP', 'YuMincho', 'Yu Mincho', serif;
    font-weight: 700;
    line-height: 1.4;
    letter-spacing: 0.02em;
    color: var(--na-primary);
}

h1 { font-size: clamp(1.875rem, 4.5vw, 3rem); }
h2 { font-size: clamp(1.5rem, 3.5vw, 2.25rem); }
h3 { font-size: clamp(1.125rem, 2.5vw, 1.5rem); }
h4 { font-size: clamp(1rem, 2vw, 1.25rem); }

p {
    line-height: 1.9;
}

/* ============================================================
   Layout Utilities
============================================================ */
.na-container {
    width: 100%;
    max-width: var(--na-container);
    margin-left: auto;
    margin-right: auto;
    padding-left: 24px;
    padding-right: 24px;
}

.na-container--narrow {
    max-width: 760px;
}

.na-section {
    padding: 96px 0;
}

.na-section--sm {
    padding: 64px 0;
}

.na-section--bg-off-white {
    background-color: var(--na-off-white);
}

.na-section--bg-primary {
    background:
        linear-gradient(135deg, rgba(27, 42, 74, 0.93) 0%, rgba(27, 42, 74, 0.9) 100%),
        url('./assets/images/accounting-work.jpg') center / cover no-repeat;
}

.na-section--bg-primary h2 {
    color: var(--na-white);
}

.na-section-header {
    text-align: center;
    margin-bottom: 64px;
}

.na-section-label {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-family: 'Noto Sans JP', sans-serif;
    font-size: 0.8125rem;
    font-weight: 700;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--na-accent);
    margin-bottom: 16px;
}

.na-section-label::before,
.na-section-label::after {
    content: '';
    width: 32px;
    height: 1px;
    background: var(--na-accent);
    display: inline-block;
}

.na-section-header h2 {
    margin-bottom: 16px;
}

.na-section-header p {
    color: var(--na-text-muted);
    font-size: 1.0625rem;
    max-width: 600px;
    margin: 0 auto;
}

/* ============================================================
   Header
============================================================ */
.na-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    height: var(--na-header-height);
    display: flex;
    align-items: center;
    transition: background var(--na-transition), box-shadow var(--na-transition), backdrop-filter var(--na-transition);
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.na-header.is-scrolled {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.06);
}

.na-header__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    max-width: var(--na-container);
    margin: 0 auto;
    padding: 0 24px;
}

.na-header__logo {
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--na-primary);
    transition: opacity var(--na-transition);
}

.na-header__logo:hover {
    opacity: 0.8;
    color: var(--na-primary);
}

.na-header__logo-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    background: var(--na-primary);
    color: var(--na-accent);
    border-radius: var(--na-radius-sm);
    font-size: 1.1rem;
}

.na-header__logo-text {
    display: flex;
    flex-direction: column;
    line-height: 1.2;
}

.na-header__logo-name {
    font-family: 'Noto Serif JP', serif;
    font-size: 1.125rem;
    font-weight: 700;
    letter-spacing: 0.05em;
}

.na-header__logo-sub {
    font-size: 0.6875rem;
    color: var(--na-text-muted);
    letter-spacing: 0.08em;
}

.na-nav {
    display: flex;
    align-items: center;
    gap: 4px;
}

.na-nav a {
    padding: 8px 16px;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--na-text);
    border-radius: var(--na-radius-sm);
    transition: color var(--na-transition), background var(--na-transition);
}

.na-nav a:hover {
    color: var(--na-primary);
    background: var(--na-light-gray);
}

.na-nav a.is-current {
    color: var(--na-accent);
    font-weight: 700;
}

.na-header__cta {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 24px;
    background: var(--na-accent);
    color: var(--na-white) !important;
    font-size: 0.875rem;
    font-weight: 700;
    border-radius: 50px;
    transition: background var(--na-transition), transform var(--na-transition), box-shadow var(--na-transition);
}

.na-header__cta:hover {
    background: var(--na-accent-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 16px rgba(200, 164, 92, 0.4);
    color: var(--na-white) !important;
}

.na-hamburger {
    display: none;
    flex-direction: column;
    gap: 6px;
    cursor: pointer;
    padding: 8px;
    background: none;
    border: none;
    color: var(--na-primary);
}

.na-hamburger span {
    display: block;
    width: 24px;
    height: 2px;
    background: currentColor;
    transition: transform var(--na-transition), opacity var(--na-transition);
}

.na-hamburger.is-active span:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
}

.na-hamburger.is-active span:nth-child(2) {
    opacity: 0;
}

.na-hamburger.is-active span:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
}

/* ============================================================
   Mobile Nav Overlay
============================================================ */
.na-mobile-nav {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 999;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding-top: var(--na-header-height);
}

.na-mobile-nav.is-open {
    display: flex;
}

.na-mobile-nav a {
    font-family: 'Noto Serif JP', serif;
    font-size: 1.375rem;
    font-weight: 700;
    color: var(--na-primary);
    padding: 12px 32px;
    border-radius: var(--na-radius-sm);
    transition: color var(--na-transition), background var(--na-transition);
}

.na-mobile-nav a:hover {
    color: var(--na-accent);
    background: var(--na-light-gray);
}

.na-mobile-nav .na-btn {
    margin-top: 24px;
}

/* ============================================================
   Footer
============================================================ */
.na-footer {
    background: var(--na-primary);
    color: rgba(255, 255, 255, 0.8);
    padding: 72px 0 32px;
}

.na-footer__grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 48px;
    margin-bottom: 48px;
}

.na-footer__brand .na-footer__logo {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
}

.na-footer__brand .na-footer__logo-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    color: var(--na-accent);
    border-radius: var(--na-radius-sm);
    font-size: 1rem;
}

.na-footer__brand .na-footer__logo-name {
    font-family: 'Noto Serif JP', serif;
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--na-white);
    letter-spacing: 0.05em;
}

.na-footer__brand p {
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.6);
    line-height: 1.8;
}

.na-footer__col h4 {
    font-family: 'Noto Sans JP', sans-serif;
    font-size: 0.8125rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--na-white);
    margin-bottom: 20px;
}

.na-footer__col ul li {
    margin-bottom: 10px;
}

.na-footer__col ul li a {
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.6);
    transition: color var(--na-transition);
}

.na-footer__col ul li a:hover {
    color: var(--na-accent);
}

.na-footer__contact-item {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.6);
    margin-bottom: 14px;
}

.na-footer__contact-item i {
    color: var(--na-accent);
    margin-top: 4px;
    flex-shrink: 0;
    width: 16px;
    text-align: center;
}

.na-footer__bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 28px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px;
}

.na-footer__bottom p {
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.4);
}

.na-footer__bottom-links {
    display: flex;
    gap: 20px;
}

.na-footer__bottom-links a {
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.4);
    transition: color var(--na-transition);
}

.na-footer__bottom-links a:hover {
    color: var(--na-accent);
}

/* ============================================================
   Buttons
============================================================ */
.na-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 36px;
    font-family: 'Noto Sans JP', sans-serif;
    font-size: 0.9375rem;
    font-weight: 700;
    border-radius: 50px;
    cursor: pointer;
    transition: all var(--na-transition);
    border: 2px solid transparent;
    line-height: 1;
    white-space: nowrap;
}

.na-btn--primary {
    background: var(--na-accent);
    color: var(--na-white);
    border-color: var(--na-accent);
}

.na-btn--primary:hover {
    background: var(--na-accent-hover);
    border-color: var(--na-accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(200, 164, 92, 0.35);
    color: var(--na-white);
}

.na-btn--outline {
    background: transparent;
    color: var(--na-primary);
    border-color: var(--na-border-dark);
}

.na-btn--outline:hover {
    border-color: var(--na-primary);
    background: var(--na-primary);
    color: var(--na-white);
}

.na-btn--white {
    background: var(--na-white);
    color: var(--na-primary);
    border-color: var(--na-white);
}

.na-btn--white:hover {
    background: transparent;
    color: var(--na-white);
    border-color: var(--na-white);
}

.na-btn--lg {
    padding: 18px 48px;
    font-size: 1rem;
}

.na-btn--full {
    width: 100%;
}

/* ============================================================
   Cards
============================================================ */
.na-card {
    background: var(--na-white);
    border: 1px solid var(--na-border);
    border-radius: var(--na-radius-lg);
    padding: 40px 32px;
    transition: all var(--na-transition);
}

.na-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--na-shadow-card-hover);
    border-color: rgba(200, 164, 92, 0.3);
}

.na-card--shadow {
    border: none;
    box-shadow: var(--na-shadow-card);
}

/* ============================================================
   Page Header (inner pages)
============================================================ */
.na-page-header {
    padding-top: calc(var(--na-header-height) + 56px);
    padding-bottom: 72px;
    background:
        linear-gradient(135deg, rgba(27, 42, 74, 0.92) 0%, rgba(59, 82, 128, 0.88) 100%),
        url('./assets/images/consultation.jpg') center / cover no-repeat;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.na-page-header::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        repeating-linear-gradient(
            0deg,
            transparent,
            transparent 50px,
            rgba(255,255,255,0.02) 50px,
            rgba(255,255,255,0.02) 51px
        ),
        repeating-linear-gradient(
            90deg,
            transparent,
            transparent 50px,
            rgba(255,255,255,0.02) 50px,
            rgba(255,255,255,0.02) 51px
        );
    pointer-events: none;
}

.na-page-header::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--na-accent), var(--na-accent-hover), var(--na-accent));
}

.na-page-header__label {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(200, 164, 92, 0.15);
    color: var(--na-accent);
    border: 1px solid rgba(200, 164, 92, 0.3);
    padding: 6px 18px;
    border-radius: 50px;
    font-family: 'Noto Sans JP', sans-serif;
    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    margin-bottom: 20px;
}

.na-page-header h1 {
    color: var(--na-white);
    margin-bottom: 16px;
}

.na-page-header .na-container {
    position: relative;
}

.na-page-header p {
    color: rgba(255, 255, 255, 0.7);
    font-size: 1.0625rem;
    max-width: 720px;
    margin: 0 auto;
}

/* ============================================================
   Scroll Animation
============================================================ */
.na-animate {
    opacity: 0;
    transform: translateY(28px);
    transition: opacity 0.7s ease, transform 0.7s ease;
}

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

.na-animate--left {
    opacity: 0;
    transform: translateX(-28px);
    transition: opacity 0.7s ease, transform 0.7s ease;
}

.na-animate--left.is-visible {
    opacity: 1;
    transform: translateX(0);
}

.na-animate--right {
    opacity: 0;
    transform: translateX(28px);
    transition: opacity 0.7s ease, transform 0.7s ease;
}

.na-animate--right.is-visible {
    opacity: 1;
    transform: translateX(0);
}

.na-animate-delay-1 { transition-delay: 0.1s; }
.na-animate-delay-2 { transition-delay: 0.2s; }
.na-animate-delay-3 { transition-delay: 0.3s; }
.na-animate-delay-4 { transition-delay: 0.4s; }

/* ============================================================
   CTA Section
============================================================ */
.na-cta-section {
    background:
        linear-gradient(135deg, rgba(27, 42, 74, 0.92) 0%, rgba(59, 82, 128, 0.88) 100%),
        url('./assets/images/office-interior.jpg') center / cover no-repeat;
    padding: 96px 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.na-cta-section::before {
    content: '';
    position: absolute;
    inset: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    pointer-events: none;
}

.na-cta-section .na-container {
    position: relative;
}

.na-cta-section h2 {
    color: var(--na-white);
    margin-bottom: 16px;
}

.na-cta-section p {
    color: rgba(255, 255, 255, 0.8);
    font-size: 1.0625rem;
    margin-bottom: 40px;
}

.na-cta-section__actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

.na-cta-section__note {
    margin-top: 24px;
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.6);
}

/* ============================================================
   Badge
============================================================ */
.na-badge {
    display: inline-block;
    padding: 4px 14px;
    border-radius: 50px;
    font-family: 'Noto Sans JP', sans-serif;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.05em;
}

.na-badge--accent {
    background: var(--na-accent);
    color: var(--na-white);
}

/* ============================================================
   Divider
============================================================ */
.na-divider {
    border: none;
    border-top: 1px solid var(--na-border);
    margin: 40px 0;
}

/* ============================================================
   Accessibility
============================================================ */
:focus-visible {
    outline: 2px solid var(--na-accent);
    outline-offset: 3px;
}

.screen-reader-text {
    clip: rect(1px, 1px, 1px, 1px);
    clip-path: inset(50%);
    height: 1px;
    margin: -1px;
    overflow: hidden;
    padding: 0;
    position: absolute;
    width: 1px;
    word-wrap: normal !important;
}

/* ============================================================
   Responsive
============================================================ */
@media (max-width: 1024px) {
    .na-footer__grid {
        grid-template-columns: 1fr 1fr;
        gap: 40px;
    }
}

@media (max-width: 768px) {
    :root {
        --na-header-height: 68px;
    }

    .na-section {
        padding: 72px 0;
    }

    .na-section-header {
        margin-bottom: 48px;
    }

    .na-nav,
    .na-header__cta {
        display: none;
    }

    .na-hamburger {
        display: flex;
    }

    .na-footer__grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .na-footer__bottom {
        flex-direction: column;
        align-items: flex-start;
        gap: 16px;
    }

    .na-page-header {
        padding-top: calc(var(--na-header-height) + 40px);
        padding-bottom: 56px;
    }
}

@media (max-width: 480px) {
    .na-section {
        padding: 56px 0;
    }

    .na-container {
        padding-left: 16px;
        padding-right: 16px;
    }

    .na-section-label::before,
    .na-section-label::after {
        width: 20px;
    }
}