/**
 * Tesla Heroes - Modern Minimalist Design
 * Inspired by Apple.com and DJI.com
 * Brand Guidelines: /docs/brandbook.md v2.0
 */

/* ========================================
   CSS CUSTOM PROPERTIES
   ======================================== */

:root {
    /* Colors - Modern Minimalist Palette */
    --white: #ffffff;
    --black: #1d1d1f;
    --gray-soft: #f5f5f7;
    --gray-medium: #86868b;
    --gray-dark: #515154;

    /* Brand Accent */
    --tesla-red: #E82127;
    --tesla-red-hover: #c91d22;
    --tesla-red-light: rgba(232, 33, 39, 0.05);

    /* Semantic Colors */
    --success: #28a745;
    --warning: #ff9500;
    --info: #007aff;

    /* Typography */
    --font-system: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;

    /* Spacing - 8px Grid */
    --space-2xs: 0.5rem;   /* 8px */
    --space-xs: 1rem;      /* 16px */
    --space-sm: 1.5rem;    /* 24px */
    --space-md: 2rem;      /* 32px */
    --space-lg: 3rem;      /* 48px */
    --space-xl: 4rem;      /* 64px */
    --space-2xl: 6rem;     /* 96px */
    --space-3xl: 8rem;     /* 128px */

    /* Transitions */
    --transition-smooth: cubic-bezier(0.4, 0, 0.2, 1);
    --duration-fast: 0.3s;
    --duration-medium: 0.6s;
}

/* ========================================
   GLOBAL STYLES
   ======================================== */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-system);
    font-size: 1.0625rem; /* 17px */
    line-height: 1.65;
    color: var(--black);
    background-color: var(--white);
    overflow-x: hidden;
}

/* ========================================
   TYPOGRAPHY
   ======================================== */

h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    letter-spacing: -0.3px;
    color: var(--black);
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 3.5rem); /* 40-56px */
    line-height: 1.1;
    letter-spacing: -0.5px;
    font-weight: 600;
    margin-bottom: var(--space-sm);
    color: var(--white);
    text-shadow: 0 2px 12px rgba(0, 0, 0, 0.3);
}

.section-title {
    font-size: clamp(2rem, 4vw, 2.5rem); /* 32-40px */
    line-height: 1.2;
    margin-bottom: var(--space-lg);
    text-align: center;
}

.column-title {
    font-size: clamp(1.5rem, 3vw, 1.75rem); /* 24-28px */
    margin-bottom: var(--space-sm);
}

.text-large {
    font-size: 1.25rem; /* 20px */
    line-height: 1.6;
    color: var(--black);
    margin-bottom: var(--space-md);
}

.text-body {
    font-size: 1.0625rem; /* 17px */
    line-height: 1.65;
    color: var(--black);
    margin-bottom: var(--space-sm);
}

.text-secondary {
    font-size: 1rem;
    line-height: 1.6;
    color: var(--gray-medium);
}

.text-white {
    color: var(--white);
}

.text-center {
    text-align: center;
}

/* ========================================
   LAYOUT CONTAINERS
   ======================================== */

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--space-md);
}

.content-narrow {
    max-width: 720px;
    margin: 0 auto;
}

.content-wide {
    max-width: 980px;
    margin: 0 auto;
}

/* ========================================
   SECTIONS
   ======================================== */

.section {
    padding: var(--space-2xl) 0;
    position: relative;
}

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

.section-dark {
    background-color: var(--black);
    color: var(--white);
}

.section-cta {
    background: linear-gradient(180deg, var(--white) 0%, var(--gray-soft) 100%);
    padding: var(--space-3xl) 0;
}

/* Mobile Section Spacing */
@media (max-width: 768px) {
    .section {
        padding: var(--space-xl) 0;
    }

    .section-cta {
        padding: var(--space-2xl) 0;
    }
}

/* ========================================
   HERO SECTION
   ======================================== */

.hero {
    min-height: 90vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: var(--space-3xl) var(--space-md);
    position: relative;
    background-color: var(--white);
    overflow: hidden;
}

/* Faded background image layer */
.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url('../images/hero.jpg');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    opacity: 0.12; /* Very faded background image */
    z-index: 0;
}

/* Subtle red tint and darkening overlays */
.hero::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image:
        linear-gradient(to bottom, rgba(0, 0, 0, 0.15), rgba(0, 0, 0, 0.12));
    z-index: 0;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.hero-logo {
    width: 300px;
    height: auto;
    display: block;
    margin: 0 auto var(--space-xl);
    transition: transform var(--duration-fast) var(--transition-smooth);
}

.hero-logo:hover {
    transform: scale(1.05);
}

@media (max-width: 768px) {
    .hero-logo {
        width: 200px;
        margin-bottom: var(--space-lg);
    }
}

.hero-subtitle {
    font-size: clamp(1.25rem, 3vw, 1.5rem);
    font-weight: 400;
    color: var(--white);
    margin-bottom: var(--space-md);
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

.hero-location {
    font-size: 1rem;
    color: rgba(255, 255, 255, 0.95);
    margin-bottom: var(--space-xl);
    letter-spacing: 0.5px;
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

@media (max-width: 768px) {
    .hero {
        min-height: 80vh;
        padding: var(--space-2xl) var(--space-md);
    }
}

/* ========================================
   BUTTONS
   ======================================== */

.btn-cta {
    display: inline-block;
    background-color: var(--tesla-red);
    color: var(--white);
    font-size: 1rem;
    font-weight: 500;
    padding: 1rem 2.5rem;
    border-radius: 980px; /* Pill shape */
    text-decoration: none;
    transition: all var(--duration-fast) var(--transition-smooth);
    border: none;
    cursor: pointer;
    letter-spacing: 0.3px;
}

.btn-cta:hover {
    background-color: var(--tesla-red-hover);
    color: var(--white);
    transform: scale(1.02);
    box-shadow: 0 8px 24px rgba(232, 33, 39, 0.25);
    text-decoration: none;
}

.btn-cta:active {
    transform: scale(0.98);
}

.btn-cta-large {
    font-size: 1.125rem;
    padding: 1.25rem 3rem;
}

.cta-wrapper {
    text-align: center;
    margin: var(--space-lg) 0;
}

/* ========================================
   DESKTOP 2-COLUMN GRID LAYOUT
   ======================================== */

/* Desktop: 2-column grid for all sections after hero */
@media (min-width: 1025px) {
    .desktop-grid-container {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: 0;
        max-width: 100%;
    }

    .grid-item {
        display: flex;
        flex-direction: column;
        min-height: 100%;
    }

    /* Adjust section padding for grid layout */
    .grid-item.section {
        padding: var(--space-xl) 0;
    }

    /* Reduce image sizes to fit 2-column layout */
    .grid-item .img-responsive {
        max-width: 450px;
        margin-left: auto;
        margin-right: auto;
    }

    /* Adjust content containers for better fit */
    .grid-item .content-narrow,
    .grid-item .content-wide {
        max-width: 100%;
        padding: 0 var(--space-md);
    }

    /* Ensure sections have equal heights in rows */
    .grid-item {
        align-self: stretch;
    }

    /* Last item spans both columns when odd number of sections */
    .grid-item:last-child:nth-child(odd) {
        grid-column: 1 / -1;
    }

    /* Center content in full-width last item */
    .grid-item:last-child:nth-child(odd) .content-narrow,
    .grid-item:last-child:nth-child(odd) .content-wide {
        max-width: 720px;
        margin-left: auto;
        margin-right: auto;
    }
}

/* Tablet and Mobile: single column (linear layout) */
@media (max-width: 1024px) {
    .desktop-grid-container {
        display: block;
    }

    .grid-item {
        display: block;
    }
}

/* ========================================
   TWO-COLUMN LAYOUT (within sections)
   ======================================== */

.two-column {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-xl);
    margin: var(--space-xl) 0;
}

.column {
    padding: var(--space-md);
}

@media (max-width: 768px) {
    .two-column {
        grid-template-columns: 1fr;
        gap: var(--space-md);
    }
}

/* ========================================
   IMAGES
   ======================================== */

.image-container {
    margin: var(--space-xl) 0;
    border-radius: 12px;
    overflow: hidden;
}

.img-responsive {
    width: 100%;
    height: auto;
    display: block;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

/* ========================================
   FEATURE LIST
   ======================================== */

.feature-list {
    margin: var(--space-xl) 0;
}

.feature-item {
    display: flex;
    align-items: flex-start;
    gap: var(--space-sm);
    margin-bottom: var(--space-md);
}

.feature-icon {
    flex-shrink: 0;
    width: 2rem;
    height: 2rem;
    background-color: var(--success);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    font-weight: 600;
}

.feature-text {
    font-size: 1.0625rem;
    line-height: 1.6;
    padding-top: 0.25rem;
}

/* ========================================
   WARNING BOX
   ======================================== */

.warning-box {
    background-color: var(--tesla-red-light);
    border-left: 4px solid var(--tesla-red);
    padding: var(--space-lg);
    border-radius: 8px;
    margin: var(--space-xl) 0;
}

.warning-list {
    margin-top: var(--space-md);
    padding-left: var(--space-md);
}

.warning-list li {
    margin-bottom: var(--space-xs);
    font-size: 1.0625rem;
    line-height: 1.6;
}

/* ========================================
   LOCATION BADGE
   ======================================== */

.location-badge {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    margin-top: var(--space-xl);
    padding: var(--space-md);
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    backdrop-filter: blur(10px);
}

.location-icon {
    font-size: 2rem;
}

.location-text {
    text-align: left;
    font-size: 1rem;
    line-height: 1.6;
}

/* ========================================
   FINAL CTA SECTION
   ======================================== */

.cta-title {
    font-size: clamp(2rem, 4vw, 2.5rem);
    margin-bottom: var(--space-md);
}

.cta-text {
    font-size: 1.25rem;
    color: var(--gray-dark);
    margin-bottom: var(--space-xl);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.cta-subtext {
    margin-top: var(--space-xl);
    font-size: 0.9375rem;
    color: var(--gray-medium);
}

/* ========================================
   FOOTER
   ======================================== */

.footer {
    background-color: var(--gray-soft);
    padding: var(--space-2xl) 0;
    border-top: 1px solid rgba(0, 0, 0, 0.06);
}

.footer-content {
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
}

.footer-title {
    font-size: 1.5rem;
    color: var(--tesla-red);
    margin-bottom: var(--space-sm);
}

.footer-address {
    font-size: 1rem;
    line-height: 1.6;
    color: var(--gray-dark);
    margin-bottom: var(--space-md);
}

.footer-contact {
    margin: var(--space-md) 0;
}

.footer-resources {
    font-size: 0.9375rem;
    color: var(--gray-medium);
    margin: var(--space-sm) 0;
}

.footer-link {
    color: var(--tesla-red);
    text-decoration: none;
    font-weight: 500;
    transition: color var(--duration-fast) var(--transition-smooth);
}

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

.footer-copyright {
    margin-top: var(--space-lg);
    font-size: 0.875rem;
    color: var(--gray-medium);
}

/* ========================================
   SCROLL ANIMATIONS
   ======================================== */

.fade-in,
.fade-in-up {
    opacity: 0;
    transition: opacity var(--duration-medium) var(--transition-smooth),
                transform var(--duration-medium) var(--transition-smooth);
}

.fade-in-up {
    transform: translateY(30px);
}

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

/* Animation Delays */
.delay-1 {
    transition-delay: 0.1s;
}

.delay-2 {
    transition-delay: 0.2s;
}

.delay-3 {
    transition-delay: 0.3s;
}

/* ========================================
   ACCESSIBILITY
   ======================================== */

a:focus,
button:focus,
.btn-cta:focus {
    outline: 3px solid var(--info);
    outline-offset: 3px;
}

/* Skip to main content link (screen reader) */
.skip-to-main {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--black);
    color: var(--white);
    padding: 8px;
    text-decoration: none;
    z-index: 100;
}

.skip-to-main:focus {
    top: 0;
}

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

/* ========================================
   RESPONSIVE DESIGN
   ======================================== */

@media (max-width: 768px) {
    :root {
        --space-2xl: 4rem;
        --space-3xl: 5rem;
    }

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

    .btn-cta {
        padding: 0.875rem 2rem;
        font-size: 0.9375rem;
    }

    .btn-cta-large {
        padding: 1rem 2.25rem;
        font-size: 1rem;
    }

    .location-badge {
        flex-direction: column;
        text-align: center;
    }

    .location-text {
        text-align: center;
    }

    .feature-item {
        gap: var(--space-xs);
    }
}

@media (max-width: 480px) {
    body {
        font-size: 1rem;
    }

    .text-large {
        font-size: 1.125rem;
    }

    .text-body {
        font-size: 1rem;
    }
}

/* ========================================
   PRINT STYLES
   ======================================== */

@media print {
    .hero,
    .section-dark,
    .section-cta,
    .footer {
        background-color: var(--white);
        color: var(--black);
    }

    .btn-cta {
        border: 2px solid var(--tesla-red);
    }

    .img-responsive {
        page-break-inside: avoid;
    }
}

/* ========================================
   HIGH CONTRAST MODE SUPPORT
   ======================================== */

@media (prefers-contrast: high) {
    :root {
        --black: #000000;
        --white: #ffffff;
        --gray-medium: #666666;
    }

    .btn-cta {
        border: 2px solid var(--black);
    }
}

/* ========================================
   CONTACT FORM
   ======================================== */

.contact-form {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 16px;
    padding: var(--space-xl);
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.08);
    margin: var(--space-xl) 0;
    backdrop-filter: blur(10px);
}

/* Form Messages */
.form-message {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-lg);
    border-radius: 12px;
    margin-bottom: var(--space-xl);
    animation: slideDown 0.4s var(--transition-smooth);
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.form-message-success {
    background-color: rgba(40, 167, 69, 0.1);
    border-left: 4px solid var(--success);
}

.form-message-error {
    background-color: rgba(232, 33, 39, 0.1);
    border-left: 4px solid var(--tesla-red);
}

.form-message-icon {
    flex-shrink: 0;
    width: 3rem;
    height: 3rem;
    background-color: var(--success);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.75rem;
    font-weight: 600;
}

.form-message-error .form-message-icon {
    background-color: var(--tesla-red);
}

.form-message-content {
    flex: 1;
}

.form-message-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--space-2xs);
    color: var(--black);
}

.form-message-content p {
    font-size: 1rem;
    color: var(--gray-dark);
    margin: 0;
}

/* Form Groups */
.form-group {
    margin-bottom: var(--space-lg);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-md);
}

@media (max-width: 768px) {
    .form-row {
        grid-template-columns: 1fr;
    }
}

.form-label {
    display: block;
    font-size: 1rem;
    font-weight: 500;
    color: var(--black);
    margin-bottom: var(--space-xs);
    letter-spacing: 0.2px;
}

.required {
    color: var(--tesla-red);
}

/* Form Inputs */
.form-input,
.form-textarea {
    width: 100%;
    padding: 1rem 1.25rem;
    font-size: 1.0625rem;
    font-family: var(--font-system);
    color: var(--black);
    background-color: var(--gray-soft);
    border: 2px solid transparent;
    border-radius: 10px;
    transition: all var(--duration-fast) var(--transition-smooth);
    outline: none;
    appearance: none;
}

.form-input::placeholder,
.form-textarea::placeholder {
    color: var(--gray-medium);
}

.form-input:focus,
.form-textarea:focus {
    background-color: var(--white);
    border-color: var(--info);
    box-shadow: 0 0 0 4px rgba(0, 122, 255, 0.1);
}

.form-input:hover:not(:focus),
.form-textarea:hover:not(:focus) {
    background-color: rgba(245, 245, 247, 0.7);
}

.form-textarea {
    resize: vertical;
    min-height: 120px;
    line-height: 1.6;
}

/* Character Counter */
.textarea-counter {
    font-size: 0.875rem;
    color: var(--gray-medium);
    margin-top: var(--space-2xs);
    text-align: right;
}

/* Form Errors */
.form-error {
    display: block;
    font-size: 0.875rem;
    color: var(--tesla-red);
    margin-top: var(--space-2xs);
    min-height: 1.25rem;
    transition: opacity var(--duration-fast) var(--transition-smooth);
}

/* Checkbox Group */
.checkbox-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    margin-top: var(--space-xs);
}

.checkbox-label {
    display: flex;
    align-items: center;
    cursor: pointer;
    padding: var(--space-sm) var(--space-md);
    background-color: var(--gray-soft);
    border-radius: 10px;
    border: 2px solid transparent;
    transition: all var(--duration-fast) var(--transition-smooth);
    position: relative;
}

.checkbox-label:hover {
    background-color: rgba(245, 245, 247, 0.7);
    border-color: var(--gray-medium);
}

.checkbox-input {
    position: absolute;
    opacity: 0;
    cursor: pointer;
}

.checkbox-custom {
    width: 24px;
    height: 24px;
    border: 2px solid var(--gray-medium);
    border-radius: 6px;
    margin-right: var(--space-sm);
    transition: all var(--duration-fast) var(--transition-smooth);
    position: relative;
    flex-shrink: 0;
}

.checkbox-input:checked ~ .checkbox-custom {
    background-color: var(--tesla-red);
    border-color: var(--tesla-red);
}

.checkbox-input:checked ~ .checkbox-custom::after {
    content: '✓';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: var(--white);
    font-size: 1rem;
    font-weight: 600;
}

.checkbox-input:focus ~ .checkbox-custom {
    box-shadow: 0 0 0 4px rgba(232, 33, 39, 0.1);
}

.checkbox-label:has(.checkbox-input:checked) {
    background-color: var(--tesla-red-light);
    border-color: var(--tesla-red);
}

.checkbox-text {
    font-size: 1rem;
    color: var(--black);
    font-weight: 400;
}

/* Form Submit */
.form-submit {
    margin-top: var(--space-xl);
    text-align: center;
}

/* Button Loader/Spinner */
.btn-loader {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
}

.spinner {
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-top-color: var(--white);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* Disabled button state */
.btn-cta:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none;
}

.btn-cta:disabled:hover {
    transform: none;
    box-shadow: none;
}

/* Mobile Form Optimizations */
@media (max-width: 768px) {
    .contact-form {
        padding: var(--space-md);
        border-radius: 12px;
    }

    .form-input,
    .form-textarea {
        padding: 0.875rem 1rem;
        font-size: 1rem;
    }

    .form-message {
        padding: var(--space-md);
        gap: var(--space-sm);
    }

    .form-message-icon {
        width: 2.5rem;
        height: 2.5rem;
        font-size: 1.5rem;
    }

    .form-message-title {
        font-size: 1.125rem;
    }

    .checkbox-label {
        padding: var(--space-xs) var(--space-sm);
    }
}

/* ========================================
   FAQ SECTION (AI/LLM Optimized)
   ======================================== */

.faq-item {
    margin-bottom: var(--space-lg);
    padding-bottom: var(--space-lg);
    border-bottom: 1px solid rgba(0, 0, 0, 0.08);
}

.faq-item:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.faq-question {
    font-size: 1.5rem; /* 24px */
    font-weight: 600;
    line-height: 1.3;
    color: var(--black);
    margin-bottom: var(--space-sm);
    letter-spacing: -0.3px;
}

.faq-answer {
    font-size: 1.0625rem; /* 17px */
    line-height: 1.65;
    color: var(--black);
    margin: 0;
}

/* Mobile FAQ adjustments */
@media (max-width: 768px) {
    .faq-question {
        font-size: 1.25rem; /* 20px */
    }

    .faq-item {
        margin-bottom: var(--space-md);
        padding-bottom: var(--space-md);
    }
}

/* Touch-friendly targets for mobile */
@media (max-width: 768px) {
    .checkbox-label {
        min-height: 48px;
    }

    .form-input,
    .form-textarea,
    .btn-cta {
        min-height: 48px;
    }
}