/* HatiSoft - Main Stylesheet */
/* Minimalist Design System with IBM Plex Sans JP */

/* Google Fonts - IBM Plex Sans JP */
@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Sans+JP:wght@400;500;600;700&display=swap');

:root {
    /* Colors - Refined Black/White with better contrast */
    --black: #000000;
    --white: #ffffff;
    --gray-50: #fafafa;
    --gray-100: #f4f4f5;
    --gray-200: #e4e4e7;
    --gray-300: #d4d4d8;
    --gray-400: #a1a1aa;
    --gray-500: #71717a;
    --gray-600: #52525b;
    --gray-700: #3f3f46;
    --gray-800: #27272a;
    --gray-900: #18181b;
    --gray-950: #09090b;

    /* Semantic Colors - Light Mode */
    --bg-primary: var(--white);
    --bg-secondary: var(--gray-50);
    --bg-tertiary: var(--gray-100);
    --bg-elevated: var(--white);
    --text-primary: var(--gray-900);
    --text-secondary: var(--gray-600);
    --text-tertiary: var(--gray-400);
    --border-color: var(--gray-200);
    --border-strong: var(--gray-300);

    /* Interactive Colors */
    --btn-primary-bg: var(--gray-900);
    --btn-primary-text: var(--white);
    --btn-secondary-bg: var(--gray-100);
    --btn-secondary-text: var(--gray-900);
    --focus-ring: rgba(0, 0, 0, 0.15);

    /* Status Colors */
    --success: #22c55e;
    --error: #ef4444;
    --warning: #f59e0b;

    /* Typography */
    --font-sans: 'IBM Plex Sans JP', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, monospace;

    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-2xl: 20px;
    --radius-full: 9999px;

    /* Shadows - More prominent for visual separation */
    --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08), 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px rgba(0, 0, 0, 0.04);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px rgba(0, 0, 0, 0.04);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px rgba(0, 0, 0, 0.04);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
    --transition-slow: 300ms ease;

    /* Layout */
    --container-max: 1200px;
    --container-padding: var(--space-6);
    --header-height: 90px;
}

/* Dark Mode */
[data-theme="dark"] {
    --bg-primary: var(--gray-950);
    --bg-secondary: var(--gray-900);
    --bg-tertiary: var(--gray-800);
    --bg-elevated: var(--gray-900);
    --text-primary: var(--gray-50);
    --text-secondary: var(--gray-400);
    --text-tertiary: var(--gray-500);
    --border-color: var(--gray-800);
    --border-strong: var(--gray-700);

    --btn-primary-bg: var(--white);
    --btn-primary-text: var(--gray-900);
    --btn-secondary-bg: var(--gray-800);
    --btn-secondary-text: var(--gray-100);
    --focus-ring: rgba(255, 255, 255, 0.2);

    --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.4);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.5);
}

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

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-sans);
    font-size: 1rem;
    line-height: 1.65;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

img,
svg {
    display: block;
    max-width: 100%;
}

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

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

ul,
ol {
    list-style: none;
}

input,
textarea,
select {
    font-family: inherit;
    font-size: inherit;
}

/* Container */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

/* Typography */
h1,
h2,
h3,
h4,
h5,
h6 {
    line-height: 1.3;
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

h1 {
    font-size: clamp(1.875rem, 4vw, 2.5rem);
}

h2 {
    font-size: clamp(1.5rem, 3vw, 1.875rem);
}

h3 {
    font-size: clamp(1.25rem, 2.5vw, 1.5rem);
}

h4 {
    font-size: 1.125rem;
}

/* Buttons - More prominent styling */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-6);
    font-size: 0.9375rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    white-space: nowrap;
    box-shadow: var(--shadow-xs);
}

.btn svg {
    width: 18px;
    height: 18px;
}

.btn-primary {
    background: var(--btn-primary-bg);
    color: var(--btn-primary-text);
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: var(--btn-secondary-bg);
    color: var(--btn-secondary-text);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: var(--bg-tertiary);
    border-color: var(--border-strong);
}

.btn-outline {
    background: transparent;
    color: var(--text-primary);
    border: 2px solid var(--border-strong);
}

.btn-outline:hover {
    background: var(--bg-tertiary);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

/* Header - Enhanced */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    backdrop-filter: blur(8px);
    background: rgba(255, 255, 255, 0.95);
}

[data-theme="dark"] .header {
    background: rgba(9, 9, 11, 0.95);
}

.header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.logo-icon {
    height: clamp(42px, 6vw, 51px);
    width: auto;
    transition: transform var(--transition-fast);
}

.logo-img {
    height: clamp(32px, 5vw, 40px);
    width: auto;
    transition: transform var(--transition-fast);
}

.logo-text {
    font-size: clamp(1.125rem, 2.5vw, 1.375rem);
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

/* Footer logo larger */
.footer-brand .logo-img {
    height: clamp(60px, 9vw, 78px);
}

.logo:hover .logo-img {
    transform: scale(1.02);
}

/* Page spacing to prevent content from being cut off by fixed header */
.page,
.app-page,
.page-content,
.tool-page {
    padding-top: 110px;
}

/* Logo theme switching */
.logo-img-dark {
    display: none;
}

[data-theme="dark"] .logo-img-light {
    display: none;
}

[data-theme="dark"] .logo-img-dark {
    display: block;
}

.logo-text {
    font-size: 1.5rem;
    /* Slightly larger text to match larger icon */
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.03em;
}

.nav {
    display: flex;
    align-items: center;
    gap: var(--space-1);
}

.nav-link {
    padding: var(--space-2) var(--space-4);
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--text-secondary);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.nav-link:hover {
    color: var(--text-primary);
    background: var(--bg-tertiary);
}

.nav-link.active {
    color: var(--text-primary);
    background: var(--bg-tertiary);
    font-weight: 600;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.theme-toggle {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    transition: all var(--transition-fast);
    border: 1px solid transparent;
}

.theme-toggle:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border-color: var(--border-color);
}

.theme-toggle svg {
    width: 22px;
    height: 22px;
}

.icon-moon {
    display: none;
}

[data-theme="dark"] .icon-sun {
    display: none;
}

[data-theme="dark"] .icon-moon {
    display: block;
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: var(--space-2);
}

.mobile-menu-btn span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: all var(--transition-fast);
}

/* Footer - Enhanced */
.footer {
    background: var(--bg-secondary);
    padding: var(--space-16) 0 var(--space-8);
    border-top: 1px solid var(--border-color);
    margin-top: var(--space-20);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--space-12);
    margin-bottom: var(--space-12);
}

.footer-brand .logo {
    margin-bottom: var(--space-4);
    gap: var(--space-3);
}

.footer-tagline {
    color: var(--text-secondary);
    font-size: 0.9375rem;
}

.footer-links h4 {
    font-size: 0.8125rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-tertiary);
    margin-bottom: var(--space-5);
    font-weight: 600;
}

.footer-links ul {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.footer-links a {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    transition: color var(--transition-fast);
}

.footer-links a:hover {
    color: var(--text-primary);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--space-8);
    border-top: 1px solid var(--border-color);
    color: var(--text-tertiary);
    font-size: 0.875rem;
}

/* Responsive */
@media (max-width: 768px) {
    :root {
        --container-padding: var(--space-4);
    }

    .nav {
        position: fixed !important;
        top: var(--header-height) !important;
        left: 0 !important;
        right: 0 !important;
        bottom: 0 !important;
        height: calc(100vh - var(--header-height)) !important;
        width: 100% !important;
        background: #ffffff !important;
        flex-direction: column;
        align-items: stretch;
        padding: var(--space-4);
        gap: var(--space-1);
        transform: translateX(100%);
        transition: transform var(--transition-base);
        border-top: 1px solid var(--border-color);
        z-index: 999;
        overflow-y: auto;
    }

    /* Ensure mobile nav is opaque in dark theme */
    [data-theme="dark"] .nav {
        background: #09090b !important;
    }

    .nav.active {
        transform: translateX(0);
    }

    .nav-link {
        padding: var(--space-4);
        font-size: 1.0625rem;
    }

    .mobile-menu-btn {
        display: flex;
    }

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

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

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

    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: var(--space-8);
    }
}

@media (max-width: 480px) {
    .footer-grid {
        grid-template-columns: 1fr;
        gap: var(--space-6);
        text-align: center;
    }

    .footer-brand {
        display: flex;
        flex-direction: column;
        align-items: center;
    }
}