/* ============================================================
   Seikōkan Dojo — Main Stylesheet
   seikokan-toyamaryu.com
   ============================================================ */


/* ------------------------------------------------------------
   CSS Custom Properties
   ------------------------------------------------------------ */
:root {
    --sumi-black: #2c2c2c;
    --warm-white: #fafafa;
    --silver-gray: #8a8a8a;
    --deep-indigo: #1a365d;
    --matcha-green: #4a5d23;
    --light-matcha: #6b7c3a;
    --matcha-accent: rgba(74, 93, 35, 0.1);
    --paper-white: #ffffff;
    --subtle-shadow: rgba(0, 0, 0, 0.08);
}


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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    line-height: 1.6;
    color: var(--sumi-black);
    background: var(--warm-white);
}

.japanese-text {
    font-family: 'Noto Sans JP', sans-serif;
}


/* ------------------------------------------------------------
   Animations
   ------------------------------------------------------------ */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    animation: fadeIn 0.8s ease forwards;
}

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

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


/* ------------------------------------------------------------
   Header & Navigation
   ------------------------------------------------------------ */
header {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(250, 250, 250, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    padding: 1rem 0;
    transition: all 0.3s ease;
}

nav {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 2rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 300;
    color: var(--sumi-black);
}

.logo .kamon {
    width: 4.5rem;
    height: 4.5rem;
    filter: brightness(0) saturate(100%) invert(0%);
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2.5rem;
}

.nav-links a {
    text-decoration: none;
    color: var(--sumi-black);
    font-weight: 400;
    transition: color 0.3s ease;
    position: relative;
}

.nav-links a:hover {
    color: var(--matcha-green);
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--matcha-green);
    transition: width 0.3s ease;
}

.nav-links a:hover::after {
    width: 100%;
}


/* ------------------------------------------------------------
   Hero Section
   ------------------------------------------------------------ */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    background: linear-gradient(135deg, var(--warm-white) 0%, var(--matcha-accent) 100%);
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 50%;
    height: 100%;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="50" cy="50" r="1" fill="rgba(74,93,35,0.05)"/></svg>') repeat;
    background-size: 60px 60px;
}

/* Kanji calligraphy column */
.japanese-characters {
    position: absolute;
    top: 8%;
    right: 150px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 25px;
    z-index: 3;
}

.japanese-characters .character {
    width: 180px;
    background-size: contain;
    background-repeat: no-repeat;
    background-position: center;
    opacity: 0.9;
}

/* Heights calculated from intrinsic image dimensions:
   height = 180px × (image_height / image_width) */
.japanese-characters .makoto {
    background-image: url('../images/makoto_sei_scan.png');
    height: 168px; /* 180 × (2393 / 2742) */
}

.japanese-characters .hikari {
    background-image: url('../images/hikari_ko_scan.png');
    height: 170px; /* 180 × (2372 / 2510) */
}

.japanese-characters .kan {
    background-image: url('../images/kan_scan.png');
    height: 178px; /* 180 × (2540 / 2571) */
}

.hero-content {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 2rem;
    display: grid;
    grid-template-columns: 1fr 0.8fr;
    gap: 1rem;
    align-items: center;
    position: relative;
    z-index: 2;
}

.hero-text h1 {
    font-size: 3.5rem;
    font-weight: 300;
    color: var(--sumi-black);
    margin-bottom: 1rem;
    line-height: 1.2;
}

.hero-text .kanji-large {
    font-size: 4rem;
    color: var(--matcha-green);
    font-weight: 400;
    display: block;
    margin-bottom: 0.5rem;
    font-family: 'Hiragino Mincho ProN', 'Yu Mincho', 'YuMincho', 'Hiragino Mincho Pro', 'MS PMincho', 'serif';
}

.hero-text .subtitle {
    font-size: 1.75rem;
    color: var(--silver-gray);
    margin-bottom: 2rem;
    font-weight: 300;
}

.hero-text p {
    color: var(--silver-gray);
    font-size: 1.1rem;
    margin-bottom: 2.5rem;
    line-height: 1.7;
}

.cta-button {
    display: inline-block;
    padding: 1rem 2rem;
    background: var(--matcha-green);
    color: var(--paper-white);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    border: 2px solid var(--matcha-green);
}

.cta-button:hover {
    background: transparent;
    color: var(--matcha-green);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px var(--subtle-shadow);
}

.hero-visual {
    display: flex;
    justify-content: flex-start;
    align-items: flex-start;
    position: relative;
    padding-left: 2rem;
    padding-top: 2rem;
}

/* Katana silhouette graphic */
.katana-silhouette {
    position: relative;
    width: 480px;
    height: 600px;
    opacity: 0.2;
    animation: float 6s ease-in-out infinite;
    transform: translateX(-150px);
}

.katana-blade {
    position: absolute;
    width: 6px;
    height: 420px;
    background: linear-gradient(180deg, var(--matcha-green), var(--sumi-black));
    left: 50%;
    top: 0;
    transform: translateX(-50%);
    clip-path: polygon(50% 0%, 0% 100%, 100% 100%);
    border: none;
    outline: none;
}

.katana-guard {
    position: absolute;
    width: 30px;
    height: 9px;
    background: var(--sumi-black);
    left: 50%;
    top: 412px;
    transform: translateX(-50%);
    border-radius: 3px;
}

.katana-handle {
    position: absolute;
    width: 12px;
    height: 135px;
    background: linear-gradient(180deg, var(--sumi-black), #4a4a4a);
    left: 50%;
    top: 427px;
    transform: translateX(-50%);
    border-radius: 0 0 6px 6px;
}

.katana-wrap {
    position: absolute;
    width: 15px;
    height: 3px;
    background: var(--matcha-green);
    left: 50%;
    transform: translateX(-50%);
    border-radius: 1.5px;
}

.katana-wrap:nth-of-type(2) { top: 295px; }
.katana-wrap:nth-of-type(3) { top: 305px; }
.katana-wrap:nth-of-type(4) { top: 315px; }
.katana-wrap:nth-of-type(5) { top: 325px; }
.katana-wrap:nth-of-type(6) { top: 335px; }
.katana-wrap:nth-of-type(7) { top: 345px; }
.katana-wrap:nth-of-type(8) { top: 355px; }


/* ------------------------------------------------------------
   Sections (shared)
   ------------------------------------------------------------ */
section {
    padding: 5rem 0;
    max-width: 1200px;
    margin: 0 auto;
    padding-left: 2rem;
    padding-right: 2rem;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 300;
    text-align: center;
    margin-bottom: 3rem;
    color: var(--sumi-black);
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 2px;
    background: var(--matcha-green);
    margin: 1rem auto;
}


/* ------------------------------------------------------------
   About Section
   ------------------------------------------------------------ */
.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: flex-start;
}

.philosophy-cards {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.about-text h3 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    color: var(--matcha-green);
    font-weight: 400;
}

.about-text p {
    margin-bottom: 1.5rem;
    color: var(--silver-gray);
    line-height: 1.7;
}

.philosophy-card {
    background: var(--paper-white);
    padding: 2rem;
    box-shadow: 0 4px 20px var(--subtle-shadow);
    border-left: 4px solid var(--matcha-green);
}

.philosophy-card .kanji {
    font-size: 3rem;
    color: var(--matcha-green);
    display: block;
    text-align: center;
    margin-bottom: 1rem;
}

.philosophy-card h4 {
    text-align: center;
    font-size: 1.2rem;
    margin-bottom: 1rem;
    color: var(--sumi-black);
}


/* ------------------------------------------------------------
   Head Instructor Card
   ------------------------------------------------------------ */
.instructor-card {
    background: var(--paper-white);
    padding: 2.5rem;
    box-shadow: 0 4px 20px var(--subtle-shadow);
    border-left: 4px solid var(--deep-indigo);
    margin: 3rem 0;
    text-align: center;
}

.instructor-card .title {
    font-size: 1rem;
    color: var(--deep-indigo);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: 0.5rem;
}

.instructor-card .photo {
    width: 90px;
    height: 90px;
    border-radius: 50%;
    margin: 1rem auto 1.5rem;
    border: 3px solid var(--deep-indigo);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.15);
    object-fit: cover;
    display: block;
}

.instructor-card .name {
    font-size: 2rem;
    color: var(--sumi-black);
    font-weight: 300;
    margin-bottom: 1.5rem;
}

.instructor-card .credentials {
    text-align: center;
}

.instructor-card .credential {
    margin-bottom: 1.2rem;
}

.instructor-card .credential:last-child {
    margin-bottom: 0;
}

.instructor-card .rank {
    font-size: 1.1rem;
    color: var(--matcha-green);
    font-weight: 500;
    margin-bottom: 0.3rem;
}

.instructor-card .federation {
    font-size: 0.9rem;
    color: var(--silver-gray);
    font-weight: 400;
    line-height: 1.4;
}

.instructor-card .federation .school {
    display: block;
    margin-bottom: 0.2rem;
}

.instructor-card .federation .japanese-text {
    display: block;
    margin-top: 0.2rem;
    font-size: 0.85rem;
}


/* ------------------------------------------------------------
   Philosophy Section
   ------------------------------------------------------------ */
.philosophy {
    padding: 4rem 2rem;
    background: var(--matcha-accent);
}

.philosophy-content {
    max-width: 1000px;
    margin: 0 auto;
}

.philosophy .philosophy-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 3rem;
    margin-top: 3rem;
    max-width: 1200px;
    margin-left: auto;
    margin-right: auto;
}

@media (max-width: 1200px) {
    .philosophy .philosophy-cards {
        grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    }
}


/* ------------------------------------------------------------
   Classes Grid
   ------------------------------------------------------------ */
.classes-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    grid-template-rows: repeat(2, 1fr);
    gap: 2rem;
    margin-top: 2rem;
}

.class-card {
    background: var(--paper-white);
    padding: 2rem;
    box-shadow: 0 4px 20px var(--subtle-shadow);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.class-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 30px var(--subtle-shadow);
}

.class-card h3 {
    font-size: 1.3rem;
    margin-bottom: 1rem;
    color: var(--matcha-green);
}

.class-card p {
    color: var(--silver-gray);
    line-height: 1.6;
}


/* ------------------------------------------------------------
   Contact Section
   ------------------------------------------------------------ */
.contact {
    background: var(--paper-white);
    padding: 5rem 2rem;
}

.contact-content {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
}

.contact-info h3 {
    color: var(--matcha-green);
    margin-bottom: 1.5rem;
}

.contact-info p {
    margin-bottom: 1rem;
    color: var(--silver-gray);
}

.social-links {
    margin-top: 1.5rem;
}

.social-link {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: #1877f2;
    color: var(--paper-white);
    text-decoration: none;
    border-radius: 5px;
    font-weight: 500;
    transition: all 0.3s ease;
    margin-right: 1rem;
}

.social-link:hover {
    background: #166fe5;
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(24, 119, 242, 0.3);
}

.social-link:visited {
    color: var(--paper-white);
}


/* ------------------------------------------------------------
   Footer
   ------------------------------------------------------------ */
footer {
    background: var(--sumi-black);
    color: var(--paper-white);
    text-align: center;
    padding: 2rem 0;
}

footer .kanji {
    font-size: 2rem;
    margin-bottom: 1rem;
    opacity: 0.7;
}


/* ------------------------------------------------------------
   Responsive — Tablet (max 768px)
   ------------------------------------------------------------ */
@media (max-width: 768px) {
    .nav-links         { display: none; }
    .japanese-characters { display: none; }
    .katana-silhouette { display: none; }
    .hero::before      { display: none; }
    .hero-visual       { display: none; }

    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
        padding: 0 1rem;
    }

    .hero-text h1       { font-size: 2.5rem; }
    .hero-text .kanji-large { font-size: 3rem; }
    .hero-text .subtitle { font-size: 1.4rem; }
    .hero-text p        { font-size: 1rem; margin-bottom: 2rem; }

    .about-content,
    .contact-content    { grid-template-columns: 1fr; }

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

    .philosophy .philosophy-cards {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    section {
        padding: 3rem 0;
        padding-left: 1rem;
        padding-right: 1rem;
    }

    .philosophy  { padding: 3rem 1rem; }
    .contact     { padding: 3rem 1rem; }

    .section-title  { font-size: 2rem; margin-bottom: 2rem; }

    .instructor-card {
        margin: 2rem 0;
        padding: 2rem;
    }

    .instructor-card .credentials { text-align: center; }
}


/* ------------------------------------------------------------
   Responsive — Mobile (max 480px)
   ------------------------------------------------------------ */
@media (max-width: 480px) {
    .hero-text h1           { font-size: 2rem; }
    .hero-text .kanji-large { font-size: 2.5rem; }
    .hero-text .subtitle    { font-size: 1.2rem; }
    .section-title          { font-size: 1.8rem; }
    .instructor-card .name  { font-size: 1.6rem; }
    .philosophy-card .kanji { font-size: 2.5rem; }

    .cta-button {
        padding: 0.8rem 1.5rem;
        font-size: 0.9rem;
    }
}