/* ============================================
   PV-Energie-Planer - Apple-inspired Design
   Minimal, Confident, Clean
   ============================================ */

/* CSS Variables */
:root {
    /* Colors - Monochrome with accent */
    --color-black: #000000;
    --color-white: #ffffff;
    --color-gray-50: #fafafa;
    --color-gray-100: #f5f5f7;
    --color-gray-200: #e8e8ed;
    --color-gray-300: #d2d2d7;
    --color-gray-400: #86868b;
    --color-gray-500: #6e6e73;
    --color-gray-600: #424245;
    --color-gray-700: #1d1d1f;
    
    /* Accent - Subtle green for energy/solar */
    --color-accent: #34c759;
    --color-accent-light: #30d158;
    
    /* Semantic */
    --color-bg: var(--color-white);
    --color-bg-secondary: var(--color-gray-100);
    --color-text: var(--color-gray-700);
    --color-text-secondary: var(--color-gray-500);
    --color-text-tertiary: var(--color-gray-400);
    --color-border: var(--color-gray-200);
    
    /* Typography - SF Pro inspired */
    --font-sans: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'SF Pro Text', 'Helvetica Neue', Helvetica, Arial, sans-serif;
    
    /* Spacing */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    --space-2xl: 48px;
    --space-3xl: 64px;
    --space-4xl: 96px;
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --radius-2xl: 24px;
    --radius-full: 9999px;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 400ms ease;
    
    /* Shadows - Subtle */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.12);
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.5;
    letter-spacing: -0.01em;
}

a {
    color: inherit;
    text-decoration: none;
    transition: opacity var(--transition-fast);
}

a:hover {
    opacity: 0.7;
}

img {
    max-width: 100%;
    height: auto;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.1;
    letter-spacing: -0.025em;
}

h1 { 
    font-size: clamp(40px, 6vw, 64px);
    font-weight: 700;
}

h2 { 
    font-size: clamp(32px, 4vw, 48px);
    font-weight: 600;
}

h3 { 
    font-size: 24px;
}

h4 { 
    font-size: 20px;
}

p {
    font-size: 17px;
    line-height: 1.6;
}

/* Container */
.container {
    width: 100%;
    max-width: 1120px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: 12px 24px;
    font-family: var(--font-sans);
    font-size: 15px;
    font-weight: 500;
    letter-spacing: -0.01em;
    border-radius: var(--radius-full);
    border: none;
    cursor: pointer;
    transition: all var(--transition-base);
    text-decoration: none;
}

.btn svg {
    width: 16px;
    height: 16px;
}

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

.btn-primary:hover {
    background: var(--color-gray-700);
    opacity: 1;
}

.btn-secondary {
    background: var(--color-gray-100);
    color: var(--color-text);
}

.btn-secondary:hover {
    background: var(--color-gray-200);
    opacity: 1;
}

.btn-outline {
    background: transparent;
    color: var(--color-text);
    box-shadow: inset 0 0 0 1px var(--color-border);
}

.btn-outline:hover {
    background: var(--color-gray-50);
    opacity: 1;
}

.btn-lg {
    padding: 16px 32px;
    font-size: 17px;
}

.btn-block {
    width: 100%;
}

/* Coming Soon Banner */
.coming-soon-banner {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: 12px var(--space-lg);
    background: linear-gradient(135deg, #ff9500 0%, #ff6b00 100%);
    color: white;
    font-size: 14px;
    font-weight: 500;
    text-align: center;
    box-shadow: 0 2px 10px rgba(255, 107, 0, 0.3);
}

.coming-soon-banner .banner-icon {
    font-size: 16px;
}

/* Adjust body padding for banner */
body {
    padding-top: 44px;
}

/* Flash Messages */
.flash-messages {
    position: fixed;
    top: var(--space-lg);
    left: 50%;
    transform: translateX(-50%);
    z-index: 1000;
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.flash-message {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md) var(--space-lg);
    background: var(--color-black);
    color: var(--color-white);
    border-radius: var(--radius-full);
    box-shadow: var(--shadow-lg);
    animation: fadeInUp 0.4s ease;
    font-size: 14px;
}

.flash-close {
    background: none;
    border: none;
    color: var(--color-white);
    opacity: 0.6;
    font-size: 18px;
    cursor: pointer;
    padding: 0;
    line-height: 1;
}

.flash-close:hover {
    opacity: 1;
}

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

/* ============================================
   Navigation
   ============================================ */
.nav-landing {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    padding: var(--space-md) 0;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: 1120px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    color: var(--color-text);
    font-weight: 600;
    font-size: 18px;
}

.nav-logo .logo-icon {
    width: 28px;
    height: 28px;
}

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

.nav-link {
    color: var(--color-text-secondary);
    font-size: 14px;
    font-weight: 500;
    transition: color var(--transition-fast);
}

.nav-link:hover {
    color: var(--color-text);
    opacity: 1;
}

.nav-mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-sm);
}

.nav-mobile-toggle span {
    width: 18px;
    height: 1.5px;
    background: var(--color-text);
    border-radius: 1px;
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: var(--space-4xl) var(--space-lg);
    background: var(--color-bg);
}

.hero-bg {
    display: none;
}

.hero-content {
    max-width: 720px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: 6px 14px;
    background: var(--color-gray-100);
    border-radius: var(--radius-full);
    font-size: 13px;
    font-weight: 500;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-lg);
}

.badge-icon {
    font-size: 14px;
}

.hero-title {
    margin-bottom: var(--space-lg);
    color: var(--color-black);
}

.gradient-text {
    background: linear-gradient(90deg, var(--color-accent) 0%, #00c7be 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-description {
    font-size: 21px;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-xl);
    max-width: 560px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.5;
}

.hero-cta {
    display: flex;
    gap: var(--space-md);
    justify-content: center;
    margin-bottom: var(--space-3xl);
}

.hero-stats {
    display: flex;
    gap: var(--space-3xl);
    justify-content: center;
}

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

.stat-value {
    font-size: 32px;
    font-weight: 700;
    color: var(--color-black);
    letter-spacing: -0.03em;
}

.stat-label {
    font-size: 13px;
    color: var(--color-text-tertiary);
    margin-top: 4px;
}

/* Hero Visual */
.hero-visual {
    display: none;
}

.app-preview {
    display: none;
}

/* ============================================
   Features Section
   ============================================ */
.features {
    padding: var(--space-4xl) 0;
    background: var(--color-bg-secondary);
}

.section-header {
    text-align: center;
    margin-bottom: var(--space-3xl);
}

.section-badge {
    display: inline-block;
    padding: 6px 14px;
    background: var(--color-white);
    border-radius: var(--radius-full);
    font-size: 13px;
    font-weight: 500;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-md);
}

.section-title {
    margin-bottom: var(--space-md);
    color: var(--color-black);
}

.section-description {
    font-size: 19px;
    color: var(--color-text-secondary);
    max-width: 560px;
    margin: 0 auto;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-lg);
}

.feature-card {
    padding: var(--space-xl);
    background: var(--color-white);
    border-radius: var(--radius-xl);
    transition: transform var(--transition-base);
}

.feature-card:hover {
    transform: translateY(-4px);
}

.feature-icon {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-gray-100);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-md);
}

.feature-icon svg {
    width: 22px;
    height: 22px;
    color: var(--color-black);
}

.feature-card h3 {
    font-size: 17px;
    font-weight: 600;
    margin-bottom: var(--space-sm);
    color: var(--color-black);
}

.feature-card p {
    color: var(--color-text-secondary);
    font-size: 15px;
    line-height: 1.5;
}

/* ============================================
   Pricing Section
   ============================================ */
.pricing-preview {
    padding: var(--space-4xl) 0;
    background: var(--color-bg);
}

.pricing-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-lg);
    max-width: 960px;
    margin: 0 auto;
}

.pricing-card {
    position: relative;
    padding: var(--space-xl);
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    text-align: center;
    transition: all var(--transition-base);
}

.pricing-card:hover {
    border-color: var(--color-gray-300);
}

.pricing-card.featured {
    background: var(--color-black);
    border-color: var(--color-black);
    color: var(--color-white);
}

.pricing-badge {
    position: absolute;
    top: -10px;
    left: 50%;
    transform: translateX(-50%);
    padding: 4px 12px;
    background: var(--color-accent);
    color: var(--color-white);
    font-size: 11px;
    font-weight: 600;
    border-radius: var(--radius-full);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.pricing-badge.save {
    background: var(--color-accent);
}

.pricing-header h3 {
    font-size: 15px;
    font-weight: 500;
    color: inherit;
    opacity: 0.7;
    margin-bottom: var(--space-md);
}

.price {
    margin-bottom: var(--space-lg);
}

.price .amount {
    font-size: 40px;
    font-weight: 700;
    letter-spacing: -0.03em;
}

.price .period {
    font-size: 15px;
    opacity: 0.6;
}

.pricing-features {
    list-style: none;
    margin-bottom: var(--space-xl);
    text-align: left;
}

.pricing-features li {
    padding: 8px 0;
    font-size: 14px;
    opacity: 0.8;
}

.pricing-card.featured .btn-outline {
    background: var(--color-white);
    color: var(--color-black);
    box-shadow: none;
}

.pricing-card.featured .btn-outline:hover {
    background: var(--color-gray-100);
}

.payment-methods {
    text-align: center;
    margin-top: var(--space-2xl);
}

.payment-methods p {
    font-size: 13px;
    color: var(--color-text-tertiary);
    margin-bottom: var(--space-md);
}

.payment-icons {
    display: flex;
    justify-content: center;
    gap: var(--space-lg);
    font-size: 13px;
    color: var(--color-text-tertiary);
}

/* ============================================
   CTA Section
   ============================================ */
.cta-section {
    padding: var(--space-4xl) 0;
    background: var(--color-black);
    color: var(--color-white);
}

.cta-content {
    text-align: center;
    max-width: 560px;
    margin: 0 auto;
}

.cta-content h2 {
    color: var(--color-white);
    margin-bottom: var(--space-md);
}

.cta-content p {
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: var(--space-xl);
    font-size: 19px;
}

.cta-content .btn-primary {
    background: var(--color-white);
    color: var(--color-black);
}

.cta-content .btn-primary:hover {
    background: var(--color-gray-100);
}

/* ============================================
   Footer
   ============================================ */
.footer {
    padding: var(--space-3xl) 0 var(--space-xl);
    background: var(--color-bg-secondary);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr repeat(3, 1fr);
    gap: var(--space-2xl);
    margin-bottom: var(--space-2xl);
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    color: var(--color-text);
    font-weight: 600;
    margin-bottom: var(--space-md);
}

.footer-logo .logo-icon {
    width: 24px;
    height: 24px;
}

.footer-brand p {
    color: var(--color-text-secondary);
    font-size: 14px;
}

.footer-links h4 {
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-text-tertiary);
    margin-bottom: var(--space-md);
    font-weight: 600;
}

.footer-links a {
    display: block;
    color: var(--color-text-secondary);
    font-size: 14px;
    padding: 6px 0;
}

.footer-links a:hover {
    color: var(--color-text);
    opacity: 1;
}

.footer-bottom {
    text-align: center;
    padding-top: var(--space-xl);
    border-top: 1px solid var(--color-border);
    color: var(--color-text-tertiary);
    font-size: 13px;
}

/* ============================================
   Auth Pages
   ============================================ */
.auth-page {
    min-height: 100vh;
    background: var(--color-bg);
}

.auth-container {
    display: flex;
    min-height: 100vh;
}

.auth-card {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: var(--space-3xl);
    max-width: 480px;
    margin: 0 auto;
}

.auth-header {
    margin-bottom: var(--space-xl);
}

.auth-logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    color: var(--color-text);
    font-weight: 600;
    margin-bottom: var(--space-2xl);
}

.auth-logo .logo-icon {
    width: 28px;
    height: 28px;
}

.auth-header h1 {
    font-size: 32px;
    margin-bottom: var(--space-sm);
    color: var(--color-black);
}

.auth-header p {
    color: var(--color-text-secondary);
    font-size: 17px;
}

.auth-form {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.form-group label {
    font-size: 13px;
    font-weight: 500;
    color: var(--color-text-secondary);
}

.form-group input[type="text"],
.form-group input[type="email"],
.form-group input[type="password"],
.form-group input[type="number"] {
    padding: 14px 16px;
    background: var(--color-gray-100);
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    color: var(--color-text);
    font-size: 17px;
    font-family: var(--font-sans);
    transition: all var(--transition-fast);
}

.form-group input:focus {
    outline: none;
    background: var(--color-white);
    border-color: var(--color-gray-300);
    box-shadow: 0 0 0 4px rgba(0, 0, 0, 0.04);
}

.form-hint {
    font-size: 12px;
    color: var(--color-text-tertiary);
}

.form-row {
    display: flex;
    gap: var(--space-md);
    align-items: center;
    justify-content: space-between;
}

.password-input {
    position: relative;
}

.password-input input {
    width: 100%;
    padding-right: 48px;
}

.password-toggle {
    position: absolute;
    right: 14px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--color-text-tertiary);
    cursor: pointer;
    padding: 0;
}

.password-toggle svg {
    width: 18px;
    height: 18px;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    cursor: pointer;
    font-size: 14px;
    color: var(--color-text-secondary);
}

.checkbox-label input {
    display: none;
}

.checkbox-custom {
    width: 18px;
    height: 18px;
    border: 1.5px solid var(--color-gray-300);
    border-radius: 4px;
    transition: all var(--transition-fast);
    position: relative;
}

.checkbox-label input:checked + .checkbox-custom {
    background: var(--color-black);
    border-color: var(--color-black);
}

.checkbox-label input:checked + .checkbox-custom::after {
    content: '';
    position: absolute;
    top: 3px;
    left: 6px;
    width: 4px;
    height: 8px;
    border: solid white;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

.forgot-link {
    font-size: 14px;
    color: var(--color-text-secondary);
}

.auth-footer {
    margin-top: var(--space-xl);
    text-align: center;
    color: var(--color-text-secondary);
    font-size: 14px;
}

.auth-footer a {
    color: var(--color-black);
    font-weight: 500;
}

.auth-visual {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-gray-100);
    padding: var(--space-3xl);
}

.visual-content {
    max-width: 360px;
}

.visual-content h2 {
    font-size: 28px;
    margin-bottom: var(--space-md);
    color: var(--color-black);
}

.visual-content p {
    color: var(--color-text-secondary);
    margin-bottom: var(--space-xl);
}

.visual-features {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.visual-feature {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md);
    background: var(--color-white);
    border-radius: var(--radius-md);
    font-size: 14px;
}

.visual-feature .icon {
    font-size: 18px;
}

.visual-benefits {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

.benefit {
    display: flex;
    gap: var(--space-md);
}

.benefit-icon {
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-accent);
    color: white;
    border-radius: 50%;
    font-size: 14px;
    font-weight: 600;
    flex-shrink: 0;
}

.benefit-text {
    display: flex;
    flex-direction: column;
}

.benefit-text strong {
    font-size: 15px;
    color: var(--color-black);
}

.benefit-text span {
    font-size: 14px;
    color: var(--color-text-secondary);
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 1024px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .pricing-cards {
        grid-template-columns: 1fr;
        max-width: 400px;
    }
    
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .nav-mobile-toggle {
        display: flex;
    }
    
    .hero {
        padding: var(--space-3xl) var(--space-lg);
    }
    
    .hero-stats {
        flex-direction: column;
        gap: var(--space-lg);
    }
    
    .hero-cta {
        flex-direction: column;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .auth-container {
        flex-direction: column;
    }
    
    .auth-visual {
        display: none;
    }
    
    .auth-card {
        max-width: 100%;
        padding: var(--space-xl);
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .form-row {
        flex-direction: column;
        align-items: stretch;
    }
}