/* ===================================
   Text Counter Tool - Styles
   Modern Tech Grid Design
   =================================== */

/* === CSS Variables === */
:root {
    /* Brand Colors */
    --color-primary: #4f46e5;
    --color-primary-hover: #4338ca;
    --color-primary-light: #eef2ff;
    --color-primary-dark: #3730a3;

    /* Accent Colors */
    --color-accent: #06b6d4;
    --color-accent-light: #e0f2fe;
    --color-orange: #f97316;
    --color-purple: #a855f7;
    --color-purple-light: #f3e8ff;
    --color-green: #10b981;
    --color-green-light: #d1fae5;

    /* Neutrals */
    --color-background: #ffffff;
    --color-surface: #f8fafc;
    --color-border: #e2e8f0;
    --color-border-subtle: #f1f5f9;
    --color-text-primary: #0f172a;
    --color-text-secondary: #475569;
    --color-text-muted: #94a3b8;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 0.75rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;

    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.03);
    --shadow-md: 0 2px 4px -1px rgba(0, 0, 0, 0.06), 0 1px 2px -1px rgba(0, 0, 0, 0.03);
    --shadow-lg: 0 8px 16px -4px rgba(0, 0, 0, 0.08), 0 2px 4px -2px rgba(0, 0, 0, 0.03);
    --shadow-xl: 0 16px 32px -8px rgba(0, 0, 0, 0.12), 0 4px 8px -4px rgba(0, 0, 0, 0.04);

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-card: 14px;

    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 200ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 300ms cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: var(--font-sans);
    color: var(--color-text-primary);
    background-color: var(--color-background);
    background-image: radial-gradient(#cbd5e1 1px, transparent 1px);
    background-size: 24px 24px;
    background-position: 0 0;
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* === Container === */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* === Header === */
.header {
    background: white;
    border-bottom: 1px solid var(--color-border);
    padding: var(--spacing-lg) 0;
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
    background-color: rgba(255, 255, 255, 0.95);
}

.nav {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
}

.site-name {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-weight: 700;
    font-size: 1.125rem;
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.site-name:hover {
    color: var(--color-primary-hover);
}

.site-name svg {
    flex-shrink: 0;
}

.tool-name {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-text-primary);
}

/* === Main === */
.main {
    flex: 1;
    padding: var(--spacing-3xl) 0;
}

/* === Counter Section === */
.counter-section {
    margin-bottom: var(--spacing-3xl);
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.section-title {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-sm);
}

.section-title svg {
    color: var(--color-primary);
}

.section-description {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
    max-width: 36rem;
    margin: 0 auto;
}

/* === Calculator Card === */
.calculator-card {
    background: white;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-card);
    padding: var(--spacing-2xl);
    box-shadow: var(--shadow-sm);
}

/* === Textarea === */
.textarea-wrapper {
    margin-bottom: var(--spacing-xl);
}

.text-input {
    width: 100%;
    min-height: 300px;
    padding: var(--spacing-lg);
    font-family: var(--font-sans);
    font-size: 1rem;
    line-height: 1.75;
    color: var(--color-text-primary);
    background: var(--color-surface);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-lg);
    resize: vertical;
    transition: all var(--transition-base);
}

.text-input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.text-input::placeholder {
    color: var(--color-text-muted);
}

/* === Stats Grid === */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.stat-card {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    background: linear-gradient(135deg, var(--color-primary-light), var(--color-accent-light));
    border-radius: var(--radius-lg);
    border: 1px solid rgba(79, 70, 229, 0.1);
    transition: all var(--transition-base);
}

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.stat-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: white;
    border-radius: var(--radius-md);
    color: var(--color-primary);
    flex-shrink: 0;
}

.stat-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.stat-label {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.025em;
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-primary);
    line-height: 1;
}

/* === Buttons === */
.button-group {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.btn-primary,
.btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-md) var(--spacing-xl);
    font-family: var(--font-sans);
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-base);
    border: none;
}

.btn-primary {
    background: var(--color-primary);
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    background: var(--color-primary-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-secondary {
    background: white;
    color: var(--color-text-secondary);
    border: 2px solid var(--color-border);
}

.btn-secondary:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary:active {
    transform: translateY(0);
}

/* === Article Section === */
.tool-article-section {
    width: 100%;
    margin: 0 auto;
    padding: 40px 20px;
    background-color: #ffffff;
    color: #333333;
    border-top: 1px solid var(--color-border);
}

.article-title {
    font-size: 1.75rem;
    font-weight: 700;
    color: #333333;
    text-align: center;
    margin-bottom: var(--spacing-2xl);
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.article-block {
    margin-bottom: var(--spacing-2xl);
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.article-subtitle {
    font-size: 1.4rem;
    font-weight: 700;
    color: #333333;
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-xs);
    border-bottom: 2px solid var(--color-primary-light);
}

.article-text {
    font-size: 1rem;
    line-height: 1.8;
    color: #333333;
}

.faq-item {
    margin-bottom: var(--spacing-lg);
}

.faq-question {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--spacing-xs);
}

/* === Footer === */
.footer {
    background-color: var(--color-surface);
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-2xl) 0;
    margin-top: auto;
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.footer-copy {
    color: var(--color-text-secondary);
    font-size: 0.875rem;
}

.footer-links {
    display: flex;
    gap: var(--spacing-lg);
}

.footer-link {
    color: var(--color-primary);
    font-size: 0.875rem;
    font-weight: 500;
    text-decoration: none;
    transition: color var(--transition-fast);
}

.footer-link:hover {
    color: var(--color-primary-hover);
    text-decoration: underline;
}

.footer-note {
    text-align: center;
    font-size: 0.75rem;
    color: var(--color-text-muted);
}

/* === Toast Notification === */
.toast {
    position: fixed;
    bottom: var(--spacing-xl);
    right: var(--spacing-xl);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--color-text-primary);
    color: white;
    font-weight: 600;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    opacity: 0;
    transform: translateY(20px);
    transition: all var(--transition-base);
    pointer-events: none;
    z-index: 1000;
}

.toast.show {
    opacity: 1;
    transform: translateY(0);
}

.toast svg {
    flex-shrink: 0;
}

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

/* Mobile */
@media (max-width: 767px) {
    .header {
        padding: var(--spacing-md) 0;
    }

    .nav {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-sm);
    }

    .tool-name {
        font-size: 1.125rem;
    }

    .main {
        padding: var(--spacing-xl) 0;
    }

    .section-title {
        font-size: 1.5rem;
        flex-direction: column;
    }

    .calculator-card {
        padding: var(--spacing-lg);
    }

    .text-input {
        min-height: 200px;
    }

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

    .button-group {
        flex-direction: column;
    }

    .btn-primary,
    .btn-secondary {
        width: 100%;
        justify-content: center;
    }

    .article-title {
        font-size: 1.5rem;
    }

    .article-subtitle {
        font-size: 1.25rem;
    }

    .toast {
        right: var(--spacing-md);
        left: var(--spacing-md);
        bottom: var(--spacing-md);
    }
}

/* Tablet */
@media (min-width: 768px) {
    .container {
        padding: 0 var(--spacing-xl);
    }

    .footer-content {
        flex-direction: row;
        justify-content: space-between;
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Desktop */
@media (min-width: 1024px) {
    .stats-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

/* === Accessibility === */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

a:focus-visible,
button:focus-visible,
textarea:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

@media (prefers-contrast: high) {
    .calculator-card,
    .stat-card,
    .article-block {
        border-width: 3px;
    }
}