/* ========================================
   AI Planter - Main Stylesheet
   A Modern, Nature-Inspired Design
   ======================================== */

/* CSS Variables */
:root {
    /* Colors */
    --color-primary: #2d5a27;
    --color-primary-light: #3d7a37;
    --color-primary-dark: #1a3d16;
    --color-primary-gradient: linear-gradient(135deg, #2d5a27 0%, #4a8a3f 100%);
    
    --color-secondary: #8b5cf6;
    --color-secondary-light: #a78bfa;
    --color-secondary-dark: #7c3aed;
    
    --color-accent: #f59e0b;
    --color-accent-light: #fbbf24;
    
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-error: #ef4444;
    --color-info: #3b82f6;
    
    /* Neutrals */
    --color-white: #ffffff;
    --color-gray-50: #f9fafb;
    --color-gray-100: #f3f4f6;
    --color-gray-200: #e5e7eb;
    --color-gray-300: #d1d5db;
    --color-gray-400: #9ca3af;
    --color-gray-500: #6b7280;
    --color-gray-600: #4b5563;
    --color-gray-700: #374151;
    --color-gray-800: #1f2937;
    --color-gray-900: #111827;
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;
    --font-size-6xl: 3.75rem;
    
    /* Spacing */
    --spacing-1: 0.25rem;
    --spacing-2: 0.5rem;
    --spacing-3: 0.75rem;
    --spacing-4: 1rem;
    --spacing-5: 1.25rem;
    --spacing-6: 1.5rem;
    --spacing-8: 2rem;
    --spacing-10: 2.5rem;
    --spacing-12: 3rem;
    --spacing-16: 4rem;
    --spacing-20: 5rem;
    --spacing-24: 6rem;
    
    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;
    
    /* Container */
    --container-max: 1200px;
}

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

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

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-gray-800);
    background-color: var(--color-white);
    overflow-x: hidden;
}

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

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

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

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

ul {
    list-style: none;
}

/* Container */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--spacing-6);
}

/* ========================================
   Header
   ======================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-gray-200);
    transition: var(--transition-base);
}

.header.scrolled {
    box-shadow: var(--shadow-md);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-primary);
}

.logo-icon {
    font-size: var(--font-size-2xl);
}

.nav {
    display: flex;
    gap: var(--spacing-8);
}

.nav-link {
    font-weight: 500;
    color: var(--color-gray-600);
    transition: var(--transition-fast);
}

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

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

.hamburger {
    width: 24px;
    height: 2px;
    background: var(--color-gray-700);
    position: relative;
    transition: var(--transition-fast);
}

.hamburger::before,
.hamburger::after {
    content: '';
    position: absolute;
    width: 24px;
    height: 2px;
    background: var(--color-gray-700);
    transition: var(--transition-fast);
}

.hamburger::before {
    top: -7px;
}

.hamburger::after {
    top: 7px;
}

/* Mobile Menu */
.mobile-menu {
    display: none;
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    background: var(--color-white);
    border-bottom: 1px solid var(--color-gray-200);
    padding: var(--spacing-6);
    flex-direction: column;
    gap: var(--spacing-4);
    box-shadow: var(--shadow-lg);
    z-index: 999;
}

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

.mobile-nav-link {
    padding: var(--spacing-3);
    font-weight: 500;
    color: var(--color-gray-600);
    transition: var(--transition-fast);
}

.mobile-nav-link:hover {
    color: var(--color-primary);
    background: var(--color-gray-50);
    border-radius: var(--radius-md);
}

.mobile-menu-actions {
    display: none;
}

/* ========================================
   Buttons
   ======================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-2);
    padding: var(--spacing-3) var(--spacing-6);
    font-size: var(--font-size-sm);
    font-weight: 600;
    border-radius: var(--radius-lg);
    transition: var(--transition-fast);
    white-space: nowrap;
}

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

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

.btn-secondary {
    background: var(--color-white);
    color: var(--color-gray-700);
    border: 1px solid var(--color-gray-300);
}

.btn-secondary:hover {
    background: var(--color-gray-50);
    border-color: var(--color-gray-400);
}

.btn-ghost {
    color: var(--color-gray-600);
}

.btn-ghost:hover {
    background: var(--color-gray-100);
    color: var(--color-gray-800);
}

.btn-lg {
    padding: var(--spacing-4) var(--spacing-8);
    font-size: var(--font-size-base);
}

.btn-icon {
    width: 18px;
    height: 18px;
}

.btn-spinner {
    width: 18px;
    height: 18px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: var(--color-white);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* ========================================
   Hero Section
   ======================================== */
.hero {
    position: relative;
    padding: var(--spacing-32) 0 var(--spacing-24);
    min-height: 100vh;
    display: flex;
    align-items: center;
    overflow: hidden;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-16);
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-title {
    font-size: var(--font-size-5xl);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: var(--spacing-6);
    color: var(--color-gray-900);
}

.gradient-text {
    background: var(--color-primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: var(--font-size-xl);
    color: var(--color-gray-600);
    margin-bottom: var(--spacing-8);
    line-height: 1.7;
}

.hero-cta {
    display: flex;
    gap: var(--spacing-4);
    margin-bottom: var(--spacing-12);
}

/* Hero Visual */
.hero-visual {
    position: relative;
}

.hero-image-container {
    position: relative;
    padding: var(--spacing-8);
}

.hero-plant-badge {
    font-size: 8rem;
    position: absolute;
    top: -20px;
    left: -20px;
    z-index: -1;
    opacity: 0.5;
}

.hero-card {
    background: var(--color-white);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-2xl);
    padding: var(--spacing-6);
    border: 1px solid var(--color-gray-100);
}

.hero-card-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-4);
    padding-bottom: var(--spacing-4);
    border-bottom: 1px solid var(--color-gray-100);
}

.plant-avatar {
    font-size: var(--font-size-4xl);
    width: 64px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-gray-50);
    border-radius: var(--radius-xl);
}

.plant-info {
    display: flex;
    flex-direction: column;
}

.plant-name {
    font-weight: 600;
    color: var(--color-gray-800);
}

.plant-status {
    font-size: var(--font-size-sm);
    color: var(--color-success);
    font-weight: 500;
}

.status-healthy {
    color: var(--color-success);
}

.hero-card-body {
    padding-top: var(--spacing-4);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-3);
}

.care-tip {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    font-size: var(--font-size-sm);
    color: var(--color-gray-600);
}

.care-icon {
    font-size: var(--font-size-lg);
}

.floating-badge {
    position: absolute;
    background: var(--color-white);
    padding: var(--spacing-3) var(--spacing-5);
    border-radius: var(--radius-full);
    box-shadow: var(--shadow-lg);
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-gray-700);
    animation: float 3s ease-in-out infinite;
}

.badge-1 {
    top: 20%;
    right: -10%;
    animation-delay: 0s;
}

.badge-2 {
    bottom: 20%;
    left: -10%;
    animation-delay: 1.5s;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

/* Hero Background Decoration */
.hero-bg-decoration {
    position: absolute;
    inset: 0;
    z-index: 0;
    overflow: hidden;
}

.bg-blob {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.5;
}

.bg-blob-1 {
    width: 400px;
    height: 400px;
    background: rgba(45, 90, 39, 0.15);
    top: -100px;
    right: -100px;
}

.bg-blob-2 {
    width: 300px;
    height: 300px;
    background: rgba(139, 92, 246, 0.1);
    bottom: 10%;
    left: -50px;
}

.bg-blob-3 {
    width: 200px;
    height: 200px;
    background: rgba(245, 158, 11, 0.1);
    top: 50%;
    right: 30%;
}

/* ========================================
   Sections Common Styles
   ======================================== */
section {
    padding: var(--spacing-24) 0;
}

.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto var(--spacing-16);
}

.section-tag {
    display: inline-block;
    padding: var(--spacing-2) var(--spacing-4);
    background: var(--color-primary);
    color: var(--color-white);
    font-size: var(--font-size-sm);
    font-weight: 600;
    border-radius: var(--radius-full);
    margin-bottom: var(--spacing-4);
}

.section-title {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    color: var(--color-gray-900);
    margin-bottom: var(--spacing-4);
}

.section-subtitle {
    font-size: var(--font-size-lg);
    color: var(--color-gray-600);
}

/* ========================================
   Features Section
   ======================================== */
.features {
    background: var(--color-gray-50);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-8);
}

.feature-card {
    background: var(--color-white);
    padding: var(--spacing-8);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    transition: var(--transition-base);
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.feature-icon {
    font-size: var(--font-size-4xl);
    margin-bottom: var(--spacing-4);
}

.feature-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--color-gray-900);
    margin-bottom: var(--spacing-3);
}

.feature-desc {
    color: var(--color-gray-600);
    line-height: 1.7;
}

/* ========================================
   How It Works Section
   ======================================== */
.steps-container {
    display: flex;
    align-items: flex-start;
    justify-content: center;
    gap: var(--spacing-4);
}

.step {
    flex: 1;
    max-width: 300px;
    text-align: center;
    position: relative;
}

.step-number {
    width: 56px;
    height: 56px;
    background: var(--color-primary-gradient);
    color: var(--color-white);
    font-size: var(--font-size-xl);
    font-weight: 700;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-4);
}

.step-content h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--color-gray-900);
    margin-bottom: var(--spacing-2);
}

.step-content p {
    color: var(--color-gray-600);
}

.step-visual {
    font-size: 4rem;
    margin-top: var(--spacing-6);
}

.step-connector {
    width: 60px;
    height: 2px;
    background: var(--color-gray-300);
    margin-top: 28px;
}

/* ========================================
   Analyzer Section
   ======================================== */
.analyzer {
    background: var(--color-gray-900);
    color: var(--color-white);
}

.analyzer .section-tag {
    background: var(--color-gray-700);
}

.analyzer .section-title {
    color: var(--color-white);
}

.analyzer .section-subtitle {
    color: var(--color-gray-400);
}

.analyzer-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    max-width: 700px;
    margin: 0 auto;
}

.analyzer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    width: 100%;
}

.analyzer-content .section-title {
    font-size: var(--font-size-3xl);
}

.analyzer-upload {
    width: 100%;
    margin: var(--spacing-8) 0;
}

.upload-zone {
    border: 2px dashed var(--color-gray-600);
    border-radius: var(--radius-xl);
    padding: var(--spacing-12);
    cursor: pointer;
    transition: var(--transition-base);
}

.upload-zone:hover {
    border-color: var(--color-primary);
    background: rgba(45, 90, 39, 0.1);
}

.upload-zone.dragover {
    border-color: var(--color-primary);
    background: rgba(45, 90, 39, 0.2);
}

.upload-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-4);
}

.upload-text {
    font-weight: 600;
    margin-bottom: var(--spacing-2);
}

.upload-hint {
    font-size: var(--font-size-sm);
    color: var(--color-gray-500);
}

.upload-preview {
    position: relative;
    border-radius: var(--radius-xl);
    overflow: hidden;
}

.upload-preview img {
    max-width: 100%;
    max-height: 300px;
    border-radius: var(--radius-xl);
}

.upload-remove {
    position: absolute;
    top: var(--spacing-2);
    right: var(--spacing-2);
    width: 32px;
    height: 32px;
    background: rgba(0, 0, 0, 0.7);
    color: var(--color-white);
    border-radius: var(--radius-full);
    font-size: var(--font-size-xl);
    display: flex;
    align-items: center;
    justify-content: center;
}

.analyzer-result {
    background: var(--color-gray-800);
    border-radius: var(--radius-xl);
    padding: var(--spacing-8);
    margin-top: var(--spacing-8);
}

.result-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-4);
    padding-bottom: var(--spacing-6);
    border-bottom: 1px solid var(--color-gray-200);
}

.result-avatar {
    font-size: var(--font-size-4xl);
}

.result-info {
    display: flex;
    flex-direction: column;
}

.result-name {
    font-size: var(--font-size-xl);
    font-weight: 700;
}

.result-confidence {
    font-size: var(--font-size-sm);
    color: var(--color-success);
    font-weight: 600;
}

.result-body {
    padding-top: var(--spacing-6);
}

.result-section {
    margin-bottom: var(--spacing-6);
}

.result-section h4 {
    font-size: var(--font-size-base);
    font-weight: 600;
    margin-bottom: var(--spacing-3);
    color: var(--color-gray-700);
}

.health-badge {
    display: inline-block;
    padding: var(--spacing-2) var(--spacing-4);
    background: rgba(16, 185, 129, 0.1);
    color: var(--color-success);
    font-weight: 600;
    border-radius: var(--radius-full);
}

.care-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-2);
}

.care-list li {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    color: var(--color-gray-600);
}

/* ========================================
   Footer
   ======================================== */
.footer {
    background: var(--color-gray-900);
    color: var(--color-gray-400);
    padding: var(--spacing-16) 0 var(--spacing-8);
}

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

.footer-bottom a {
    color: var(--color-primary);
}

.footer-bottom a:hover {
    color: var(--color-white);
}

/* ========================================
   Responsive Design
   ======================================== */
@media (max-width: 1024px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-visual {
        order: -1;
    }
    
    .hero-cta {
        justify-content: center;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .steps-container {
        flex-direction: column;
        align-items: center;
    }
    
    .step-connector {
        width: 2px;
        height: 40px;
        margin: var(--spacing-4) 0;
    }
    
    .analyzer-card {
        flex-direction: column;
    }
}

@media (max-width: 768px) {
    .nav {
        display: none;
    }
    
    .mobile-menu-btn {
        display: flex;
    }
    
    .hero {
        padding-top: var(--spacing-24);
    }
    
    .hero-title {
        font-size: var(--font-size-3xl);
    }
    
    .hero-subtitle {
        font-size: var(--font-size-lg);
    }
    
    .hero-cta {
        flex-direction: column;
    }
    
    .section-title {
        font-size: var(--font-size-3xl);
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-4);
    }
    
    .hero-title {
        font-size: var(--font-size-2xl);
    }
    
    .section-title {
        font-size: var(--font-size-2xl);
    }
}