/*
Theme Name: NAC
Theme URI: https://example.com/nac
Author: NAC Corporation
Author URI: https://example.com
Description: 人財育成・能力開発コンサルティング企業向けコーポレートテーマ - 成長と活力を表現するグリーン基調のデザイン
Version: 1.0.0
License: GNU General Public License v2 or later
License URI: http://www.gnu.org/licenses/gpl-2.0.html
Text Domain: nac
Tags: one-column, custom-menu, featured-images, translation-ready, corporate
*/

/* ==========================================================================
   CSS Variables
   ========================================================================== */
:root {
    --color-primary: #2d6a4f;
    --color-primary-dark: #1b4332;
    --color-primary-light: #40916c;
    --color-secondary: #52b788;
    --color-accent: #95d5b2;
    --color-accent-light: #d8f3dc;
    --color-white: #ffffff;
    --color-light: #f8faf9;
    --color-gray: #6b7280;
    --color-gray-light: #e5e7eb;
    --color-dark: #1f2937;
    --color-text: #374151;
    --font-primary: 'Noto Sans JP', 'Helvetica Neue', Arial, sans-serif;
    --font-heading: 'M PLUS Rounded 1c', 'Noto Sans JP', sans-serif;
    --transition: all 0.3s ease;
    --transition-slow: all 0.5s ease;
    --shadow: 0 4px 20px rgba(45, 106, 79, 0.1);
    --shadow-hover: 0 8px 30px rgba(45, 106, 79, 0.2);
    --radius: 12px;
    --radius-lg: 24px;
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-primary);
    font-weight: 400;
    line-height: 1.8;
    color: var(--color-text);
    background-color: var(--color-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

img {
    max-width: 100%;
    height: auto;
    vertical-align: middle;
}

ul, ol {
    list-style: none;
}

/* ==========================================================================
   Typography
   ========================================================================== */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.4;
    color: var(--color-primary-dark);
}

h1 { font-size: 2.75rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

p {
    margin-bottom: 1rem;
}

/* ==========================================================================
   Layout
   ========================================================================== */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.section {
    padding: 100px 0;
    position: relative;
}

.section--light {
    background-color: var(--color-light);
}

.section--accent {
    background-color: var(--color-accent-light);
}

.section__header {
    text-align: center;
    margin-bottom: 60px;
}

.section__title {
    font-size: 2rem;
    margin-bottom: 1rem;
    position: relative;
    display: inline-block;
}

.section__title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--color-secondary), var(--color-accent));
    border-radius: 2px;
}

.section__subtitle {
    color: var(--color-gray);
    font-size: 1rem;
    margin-top: 1.5rem;
}

/* ==========================================================================
   Header
   ========================================================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    transition: var(--transition);
}

.header--scrolled {
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
}

.header__inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 80px;
}

.header__logo {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-primary);
}

.header__logo span {
    color: var(--color-secondary);
}

.header__nav {
    display: flex;
    gap: 2.5rem;
}

.header__nav-link {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--color-text);
    position: relative;
    padding: 0.5rem 0;
}

.header__nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
    transition: var(--transition);
}

.header__nav-link:hover::after,
.header__nav-link--active::after {
    width: 100%;
}

.header__nav-link:hover {
    color: var(--color-primary);
}

/* Mobile Menu Button */
.header__menu-btn {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 30px;
    height: 30px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
}

.header__menu-btn span {
    display: block;
    width: 100%;
    height: 2px;
    background-color: var(--color-primary);
    transition: var(--transition);
    border-radius: 1px;
}

.header__menu-btn--active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.header__menu-btn--active span:nth-child(2) {
    opacity: 0;
}

.header__menu-btn--active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 50%, var(--color-secondary) 100%);
    overflow: hidden;
}

.hero__bg-pattern {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    opacity: 0.1;
    background-image:
        radial-gradient(circle at 20% 50%, rgba(255,255,255,0.3) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(255,255,255,0.2) 0%, transparent 40%),
        radial-gradient(circle at 40% 80%, rgba(255,255,255,0.2) 0%, transparent 40%);
}

.hero__floating {
    position: absolute;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    animation: float 6s ease-in-out infinite;
}

.hero__floating--1 {
    width: 300px;
    height: 300px;
    top: 10%;
    right: 10%;
    animation-delay: 0s;
}

.hero__floating--2 {
    width: 200px;
    height: 200px;
    bottom: 20%;
    left: 5%;
    animation-delay: 2s;
}

.hero__floating--3 {
    width: 150px;
    height: 150px;
    top: 50%;
    right: 30%;
    animation-delay: 4s;
}

@keyframes float {
    0%, 100% {
        transform: translateY(0) scale(1);
    }
    50% {
        transform: translateY(-20px) scale(1.05);
    }
}

.hero__content {
    position: relative;
    z-index: 1;
    max-width: 700px;
    color: var(--color-white);
}

.hero__title {
    font-size: 3rem;
    font-weight: 700;
    color: var(--color-white);
    margin-bottom: 1.5rem;
    line-height: 1.3;
}

.hero__title-accent {
    display: block;
    background: linear-gradient(90deg, var(--color-accent-light), var(--color-accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero__description {
    font-size: 1.125rem;
    line-height: 2;
    opacity: 0.9;
    margin-bottom: 2.5rem;
}

.hero__cta {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem 2rem;
    background-color: var(--color-white);
    color: var(--color-primary);
    font-weight: 600;
    border-radius: var(--radius);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
    transition: var(--transition);
}

.hero__cta:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
}

.hero__cta-icon {
    width: 20px;
    height: 20px;
    transition: var(--transition);
}

.hero__cta:hover .hero__cta-icon {
    transform: translateX(5px);
}

/* Wave Divider */
.hero__wave {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    overflow: hidden;
    line-height: 0;
}

.hero__wave svg {
    position: relative;
    display: block;
    width: calc(100% + 1.3px);
    height: 80px;
}

.hero__wave .shape-fill {
    fill: var(--color-white);
}

/* ==========================================================================
   About Section
   ========================================================================== */
.about {
    background-color: var(--color-white);
}

.about__grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.about__image-wrapper {
    position: relative;
}

.about__image {
    width: 100%;
    height: 400px;
    object-fit: cover;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
}

.about__image-decoration {
    position: absolute;
    bottom: -20px;
    right: -20px;
    width: 200px;
    height: 200px;
    background: linear-gradient(135deg, var(--color-accent-light), var(--color-accent));
    border-radius: var(--radius-lg);
    z-index: -1;
}

.about__content {
    padding: 20px 0;
}

.about__title {
    font-size: 1.875rem;
    margin-bottom: 1.5rem;
}

.about__text {
    color: var(--color-text);
    margin-bottom: 2rem;
    line-height: 2;
}

.about__features {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

.about__feature {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
}

.about__feature-icon {
    width: 48px;
    height: 48px;
    min-width: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    border-radius: 12px;
    color: var(--color-white);
}

.about__feature-icon svg {
    width: 24px;
    height: 24px;
}

.about__feature-text h4 {
    font-size: 1rem;
    margin-bottom: 0.25rem;
    color: var(--color-primary-dark);
}

.about__feature-text p {
    font-size: 0.875rem;
    color: var(--color-gray);
    margin: 0;
}

/* ==========================================================================
   Business Section
   ========================================================================== */
.business {
    background-color: var(--color-light);
    position: relative;
}

.business__wave-top {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    overflow: hidden;
    line-height: 0;
    transform: rotate(180deg);
}

.business__wave-top svg {
    position: relative;
    display: block;
    width: calc(100% + 1.3px);
    height: 50px;
}

.business__wave-top .shape-fill {
    fill: var(--color-white);
}

.business__cards {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
    margin-top: 30px;
}

.business__card {
    background-color: var(--color-white);
    border-radius: var(--radius-lg);
    padding: 40px;
    box-shadow: var(--shadow);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.business__card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
    transform: scaleX(0);
    transition: var(--transition);
}

.business__card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
}

.business__card:hover::before {
    transform: scaleX(1);
}

.business__card-number {
    font-family: var(--font-heading);
    font-size: 3rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--color-accent), var(--color-accent-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
    margin-bottom: 1rem;
}

.business__card-title {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: var(--color-primary-dark);
}

.business__card-description {
    color: var(--color-text);
    line-height: 1.8;
    margin: 0;
}

/* ==========================================================================
   Contact Section
   ========================================================================== */
.contact {
    background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 100%);
    position: relative;
}

.contact__wave-top {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    overflow: hidden;
    line-height: 0;
    transform: rotate(180deg);
}

.contact__wave-top svg {
    position: relative;
    display: block;
    width: calc(100% + 1.3px);
    height: 50px;
}

.contact__wave-top .shape-fill {
    fill: var(--color-light);
}

.contact .section__header {
    color: var(--color-white);
}

.contact .section__title {
    color: var(--color-white);
}

.contact .section__title::after {
    background: linear-gradient(90deg, var(--color-accent), var(--color-accent-light));
}

.contact .section__subtitle {
    color: rgba(255, 255, 255, 0.8);
}

.contact__wrapper {
    max-width: 600px;
    margin: 0 auto;
}

.contact__form {
    background-color: var(--color-white);
    border-radius: var(--radius-lg);
    padding: 50px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.form__group {
    margin-bottom: 1.5rem;
}

.form__label {
    display: block;
    font-weight: 500;
    margin-bottom: 0.5rem;
    color: var(--color-primary-dark);
}

.form__label-required {
    color: #ef4444;
    margin-left: 0.25rem;
}

.form__input,
.form__textarea {
    width: 100%;
    padding: 1rem 1.25rem;
    border: 2px solid var(--color-gray-light);
    border-radius: var(--radius);
    font-family: var(--font-primary);
    font-size: 1rem;
    transition: var(--transition);
    background-color: var(--color-white);
}

.form__input:focus,
.form__textarea:focus {
    outline: none;
    border-color: var(--color-secondary);
    box-shadow: 0 0 0 4px rgba(82, 183, 136, 0.1);
}

.form__textarea {
    min-height: 150px;
    resize: vertical;
}

.form__submit {
    width: 100%;
    padding: 1rem 2rem;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: var(--color-white);
    font-family: var(--font-primary);
    font-size: 1rem;
    font-weight: 600;
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    transition: var(--transition);
}

.form__submit:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(45, 106, 79, 0.3);
}

.form__submit:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none;
}

.form__message {
    margin-top: 1rem;
    padding: 1rem;
    border-radius: var(--radius);
    text-align: center;
    display: none;
}

.form__message--success {
    display: block;
    background-color: var(--color-accent-light);
    color: var(--color-primary-dark);
}

.form__message--error {
    display: block;
    background-color: #fef2f2;
    color: #dc2626;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.footer {
    background-color: var(--color-primary-dark);
    color: var(--color-white);
    padding: 30px 0;
}

.footer__inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer__logo {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    font-weight: 700;
}

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

.footer__copyright {
    font-size: 0.875rem;
    opacity: 0.8;
}

/* ==========================================================================
   Animations
   ========================================================================== */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: var(--transition-slow);
}

.fade-in--visible {
    opacity: 1;
    transform: translateY(0);
}

.fade-in-left {
    opacity: 0;
    transform: translateX(-30px);
    transition: var(--transition-slow);
}

.fade-in-left--visible {
    opacity: 1;
    transform: translateX(0);
}

.fade-in-right {
    opacity: 0;
    transform: translateX(30px);
    transition: var(--transition-slow);
}

.fade-in-right--visible {
    opacity: 1;
    transform: translateX(0);
}

/* ==========================================================================
   Responsive
   ========================================================================== */

/* Tablet */
@media (max-width: 1024px) {
    h1 { font-size: 2.5rem; }
    h2 { font-size: 1.75rem; }

    .section {
        padding: 80px 0;
    }

    .hero__title {
        font-size: 2.5rem;
    }

    .about__grid {
        gap: 40px;
    }

    .business__cards {
        gap: 20px;
    }

    .business__card {
        padding: 30px;
    }
}

/* Mobile Landscape */
@media (max-width: 768px) {
    .container {
        padding: 0 1.5rem;
    }

    .header__nav {
        position: fixed;
        top: 80px;
        left: 0;
        right: 0;
        background-color: var(--color-white);
        flex-direction: column;
        align-items: center;
        padding: 2rem;
        gap: 1.5rem;
        box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition);
    }

    .header__nav--active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .header__menu-btn {
        display: flex;
    }

    .hero {
        min-height: auto;
        padding: 120px 0 100px;
    }

    .hero__title {
        font-size: 2rem;
    }

    .hero__wave svg {
        height: 50px;
    }

    .about__grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .about__image {
        height: 300px;
    }

    .about__image-decoration {
        width: 150px;
        height: 150px;
        bottom: -15px;
        right: -15px;
    }

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

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

    .contact__form {
        padding: 30px;
    }

    .footer__inner {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
}

/* Mobile Portrait */
@media (max-width: 480px) {
    html {
        font-size: 14px;
    }

    .section {
        padding: 60px 0;
    }

    .section__header {
        margin-bottom: 40px;
    }

    .hero__title {
        font-size: 1.75rem;
    }

    .hero__description {
        font-size: 1rem;
    }

    .hero__cta {
        width: 100%;
        justify-content: center;
    }

    .about__image {
        height: 250px;
    }

    .business__card {
        padding: 25px;
    }

    .business__card-number {
        font-size: 2.5rem;
    }

    .contact__form {
        padding: 25px;
    }
}