/* Sofrono Website Styles */
/* Based on Style Guide - Light mode with green accents */

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

/* ===== CSS Variables ===== */
:root {
    /* Backgrounds */
    --color-background-primary: #fafaf9;
    --color-background-secondary: #f5f5f3;
    --color-background-tertiary: #ececea;

    /* Accents */
    --color-accent-primary: #4db88e;
    --color-accent-secondary: #3a9e7a;
    --color-accent-hover: #5fcca0;

    /* Text */
    --color-text-primary: #1a1a1a;
    --color-text-secondary: #4a4a48;
    --color-text-tertiary: #6a6a68;

    /* Borders */
    --color-border: rgba(0, 0, 0, 0.08);
    --color-border-hover: rgba(0, 0, 0, 0.15);

    /* Semantic */
    --color-success: #4db88e;
    --color-warning: #d4a05e;
    --color-error: #d65a5a;
    --color-info: #5a8fd4;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.12);
    --shadow-accent: 0 8px 20px rgba(77, 184, 142, 0.25);

    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.5rem;
    --space-6: 2rem;
    --space-7: 2.5rem;
    --space-8: 3rem;
    --space-10: 4rem;
    --space-12: 5rem;
    --space-16: 7rem;
    --space-20: 10rem;

    /* Typography */
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --weight-regular: 400;
    --weight-medium: 500;
    --weight-semibold: 600;
    --weight-bold: 700;

    /* Container */
    --container-xl: 1280px;
    --container-padding: clamp(1.5rem, 4vw, 3rem);

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-base: 0.2s ease;
    --transition-slow: 0.3s ease;

    /* Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
}

/* ===== Base Styles ===== */
html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--color-text-primary);
    background: var(--color-background-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ===== Typography ===== */
h1, h2, h3, h4, h5, h6 {
    font-weight: var(--weight-bold);
    line-height: 1.2;
    color: var(--color-text-primary);
}

h1 {
    font-size: clamp(2.5rem, 4vw + 1rem, 4rem);
}

h2 {
    font-size: clamp(2rem, 3vw + 0.75rem, 3rem);
}

h3 {
    font-size: clamp(1.5rem, 2vw + 0.5rem, 2rem);
}

h4 {
    font-size: 1.25rem;
}

p {
    margin-bottom: var(--space-4);
    color: var(--color-text-secondary);
}

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

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

/* ===== Layout ===== */
.container {
    max-width: var(--container-xl);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

.section {
    padding: var(--space-12) 0;
}

.section-sm {
    padding: var(--space-8) 0;
}

.section-lg {
    padding: var(--space-16) 0;
}

/* ===== Header & Navigation ===== */
.header {
    position: sticky;
    top: 0;
    background: rgba(250, 250, 249, 0.95);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--color-border);
    z-index: 1000;
    height: 4.5rem;
}

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

.logo {
    font-size: 1.5rem;
    font-weight: var(--weight-bold);
    color: var(--color-text-primary);
}

.logo:hover {
    color: var(--color-accent-primary);
}

.nav-links {
    display: flex;
    list-style: none;
    gap: var(--space-6);
}

.nav-link {
    color: var(--color-text-secondary);
    font-weight: var(--weight-medium);
    transition: color var(--transition-base);
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-md);
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-accent-primary);
}

/* Mobile Menu */
.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-2);
}

.mobile-menu-toggle span {
    display: block;
    width: 1.5rem;
    height: 2px;
    background: var(--color-text-primary);
    margin: 5px 0;
    transition: var(--transition-base);
}

@media (max-width: 768px) {
    .mobile-menu-toggle {
        display: block;
    }

    .nav-links {
        position: absolute;
        top: 4.5rem;
        left: 0;
        right: 0;
        flex-direction: column;
        background: rgba(250, 250, 249, 0.98);
        backdrop-filter: blur(8px);
        padding: var(--space-5);
        gap: var(--space-2);
        border-bottom: 1px solid var(--color-border);
        transform: translateY(-100%);
        opacity: 0;
        pointer-events: none;
        transition: all var(--transition-slow);
    }

    .nav-links.active {
        transform: translateY(0);
        opacity: 1;
        pointer-events: all;
    }

    .nav-link {
        display: block;
        padding: var(--space-3);
    }
}

/* ===== Hero Section ===== */
.hero {
    text-align: center;
    padding: var(--space-16) var(--container-padding);
    background: var(--color-background-secondary);
}

.hero-title {
    margin-bottom: var(--space-5);
    color: var(--color-text-primary);
}

.hero-subtitle {
    font-size: clamp(1.125rem, 1.5vw + 0.5rem, 1.5rem);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-8);
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.hero-actions {
    display: flex;
    gap: var(--space-4);
    justify-content: center;
    flex-wrap: wrap;
}

/* ===== Buttons ===== */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-md);
    font-weight: var(--weight-semibold);
    font-size: 1rem;
    border: none;
    cursor: pointer;
    transition: all var(--transition-base);
    text-decoration: none;
    text-align: center;
}

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

.btn-primary:hover {
    background: var(--color-accent-hover);
    transform: scale(1.02);
    box-shadow: var(--shadow-accent);
    color: white;
}

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

.btn-secondary:hover {
    border-color: var(--color-accent-primary);
    color: var(--color-accent-primary);
}

.btn-ghost {
    background: transparent;
    color: var(--color-text-secondary);
}

.btn-ghost:hover {
    color: var(--color-accent-primary);
}

/* ===== Cards ===== */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-6);
    margin-top: var(--space-8);
}

.card {
    background: white;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-6);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-slow);
}

.card:hover {
    border-color: var(--color-accent-primary);
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.card-icon {
    width: 3.5rem;
    height: 3.5rem;
    margin-bottom: var(--space-4);
    background: var(--color-accent-primary);
    color: white;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem;
}

.card-icon svg {
    width: 100%;
    height: 100%;
    stroke: currentColor;
}

.card-title {
    font-size: 1.375rem;
    margin-bottom: var(--space-3);
    color: var(--color-text-primary);
}

.card-description {
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: 0;
}

.card ul {
    list-style: none;
    margin-top: var(--space-4);
}

.card ul li {
    padding: var(--space-2) 0;
    color: var(--color-text-secondary);
    position: relative;
    padding-left: var(--space-5);
}

.card ul li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--color-accent-primary);
    font-weight: var(--weight-bold);
}

/* ===== Content Sections ===== */
.content {
    max-width: 900px;
    margin: 0 auto;
}

.content h2 {
    margin-bottom: var(--space-5);
    color: var(--color-text-primary);
}

.content h3 {
    margin-top: var(--space-8);
    margin-bottom: var(--space-4);
    color: var(--color-text-primary);
}

.content p {
    font-size: 1.125rem;
    line-height: 1.8;
    margin-bottom: var(--space-5);
}

.content ul {
    margin-bottom: var(--space-5);
    margin-left: var(--space-6);
}

.content ul li {
    margin-bottom: var(--space-2);
    color: var(--color-text-secondary);
    font-size: 1.125rem;
}

/* ===== About Section ===== */
.about-intro {
    background: var(--color-background-secondary);
    padding: var(--space-8);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-8);
}

.about-intro h2 {
    text-align: center;
    margin-bottom: var(--space-6);
}

.expertise-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-4);
    margin-top: var(--space-6);
}

.expertise-item {
    background: white;
    padding: var(--space-4);
    border-radius: var(--radius-md);
    border-left: 3px solid var(--color-accent-primary);
}

.expertise-item h4 {
    font-size: 1rem;
    font-weight: var(--weight-semibold);
    color: var(--color-accent-primary);
    margin-bottom: var(--space-2);
}

.expertise-item p {
    font-size: 0.9375rem;
    margin-bottom: 0;
}

/* ===== Forms ===== */
.form-group {
    margin-bottom: var(--space-5);
}

.form-label {
    display: block;
    margin-bottom: var(--space-2);
    color: var(--color-text-primary);
    font-weight: var(--weight-medium);
}

.form-label.required::after {
    content: " *";
    color: var(--color-error);
}

.form-input,
.form-textarea {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background: white;
    font-family: inherit;
    font-size: 1rem;
    color: var(--color-text-primary);
    transition: all var(--transition-base);
}

.form-input:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--color-accent-primary);
    box-shadow: 0 0 0 3px rgba(77, 184, 142, 0.1);
}

.form-input.error,
.form-textarea.error {
    border-color: var(--color-error);
}

.form-input.error:focus,
.form-textarea.error:focus {
    box-shadow: 0 0 0 3px rgba(214, 90, 90, 0.1);
}

.form-error {
    color: var(--color-error);
    font-size: 0.875rem;
    margin-top: var(--space-2);
    display: none;
}

.form-error.visible {
    display: block;
}

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

/* ===== Alerts ===== */
.alert {
    padding: 1rem 1.25rem;
    border-radius: var(--radius-md);
    margin-bottom: var(--space-5);
    border-left: 4px solid;
    display: none;
}

.alert.visible {
    display: block;
}

.alert-success {
    background: rgba(77, 184, 142, 0.1);
    border-color: var(--color-success);
    color: #2d7a5f;
}

.alert-error {
    background: rgba(214, 90, 90, 0.1);
    border-color: var(--color-error);
    color: #a83f3f;
}

/* ===== Footer ===== */
.footer {
    background: var(--color-background-secondary);
    padding: var(--space-8) 0;
    margin-top: var(--space-12);
    border-top: 1px solid var(--color-border);
}

.footer-content {
    text-align: center;
    color: var(--color-text-tertiary);
    font-size: 0.9375rem;
}

/* ===== Utility Classes ===== */
.text-center {
    text-align: center;
}

.mb-2 { margin-bottom: var(--space-2); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); }

.mt-2 { margin-top: var(--space-2); }
.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mt-8 { margin-top: var(--space-8); }

/* ===== Accessibility ===== */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

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

/* Focus styles */
:focus-visible {
    outline: 2px solid var(--color-accent-primary);
    outline-offset: 2px;
}

/* ===== Responsive Adjustments ===== */
@media (max-width: 768px) {
    .hero {
        padding: var(--space-10) var(--container-padding);
    }

    .section {
        padding: var(--space-8) 0;
    }

    .section-lg {
        padding: var(--space-10) 0;
    }

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

    .hero-actions {
        flex-direction: column;
        align-items: stretch;
    }

    .btn {
        width: 100%;
    }
}