/* ===================================
   FlintESP JVM Flasher - Styles
   Modern Dark Theme with Glassmorphism
   =================================== */

/* CSS Variables */
:root {
    /* Colors */
    --color-bg-primary: #0a0a0f;
    --color-bg-secondary: #12121a;
    --color-bg-tertiary: #1a1a25;

    --color-surface: rgba(255, 255, 255, 0.03);
    --color-surface-hover: rgba(255, 255, 255, 0.06);
    --color-border: rgba(255, 255, 255, 0.08);
    --color-border-hover: rgba(255, 255, 255, 0.15);

    --color-text-primary: #ffffff;
    --color-text-secondary: #a0a0b0;
    --color-text-muted: #6a6a80;

    --color-accent-primary: #f97316;
    --color-accent-secondary: #ef4444;
    --color-accent-tertiary: #fbbf24;

    --gradient-primary: linear-gradient(135deg, #f97316 0%, #ef4444 50%, #dc2626 100%);
    --gradient-glow: linear-gradient(135deg, rgba(249, 115, 22, 0.4) 0%, rgba(239, 68, 68, 0.4) 50%, rgba(220, 38, 38, 0.4) 100%);

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 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: 2rem;
    --font-size-4xl: 2.5rem;
    --font-size-5xl: 3rem;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 40px rgba(249, 115, 22, 0.3);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 350ms ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-text-primary);
    background-color: var(--color-bg-primary);
    min-height: 100vh;
    overflow-x: hidden;
}

/* Animated Background */
.bg-gradient {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background:
        radial-gradient(ellipse 80% 50% at 20% 40%, rgba(249, 115, 22, 0.15) 0%, transparent 50%),
        radial-gradient(ellipse 60% 40% at 80% 60%, rgba(239, 68, 68, 0.12) 0%, transparent 50%),
        radial-gradient(ellipse 50% 30% at 50% 80%, rgba(251, 191, 36, 0.1) 0%, transparent 50%);
    pointer-events: none;
    z-index: -2;
}

.bg-grid {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
    background-size: 50px 50px;
    pointer-events: none;
    z-index: -1;
}

/* Container */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* Glass Card Effect */
.glass-card {
    background: var(--color-surface);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    transition: all var(--transition-normal);
}

.glass-card:hover {
    background: var(--color-surface-hover);
    border-color: var(--color-border-hover);
}

/* ===================================
   Header
   =================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    padding: var(--spacing-md) 0;
    background: rgba(10, 10, 15, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.logo-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-bg-tertiary);
    border-radius: var(--radius-md);
    color: white;
}

.logo-icon img {
    width: 34px;
    height: 34px;
}

.logo-icon.small {
    width: 28px;
    height: 28px;
    border-radius: var(--radius-sm);
}

.logo-icon.small img {
    width: 16px;
    height: 16px;
}

.logo-text h1 {
    font-size: var(--font-size-xl);
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo-text .tagline {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

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

.nav-link {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: var(--font-size-sm);
    font-weight: 500;
    transition: color var(--transition-fast);
}

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

/* ===================================
   Hero Section
   =================================== */
.hero {
    padding: calc(100px + var(--spacing-3xl)) 0 var(--spacing-3xl);
    text-align: center;
}

.hero-title {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    line-height: 1.2;
}

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

.hero-subtitle {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto var(--spacing-2xl);
}

.requirements {
    display: flex;
    justify-content: center;
    gap: var(--spacing-xl);
    flex-wrap: wrap;
}

.requirement {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-2xl);
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

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

/* ===================================
   About Intro Section (in Hero)
   =================================== */
.about-intro {
    margin: var(--spacing-2xl) 0;
}

.about-intro-text {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    line-height: 1.8;
    margin-bottom: var(--spacing-2xl);
    text-align: center;
}

.about-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-2xl);
}

.feature-item {
    padding: var(--spacing-lg);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    text-align: center;
    transition: all var(--transition-normal);
}

.feature-item:hover {
    background: var(--color-surface-hover);
    border-color: var(--color-border-hover);
    transform: translateY(-4px);
}

.feature-icon {
    display: block;
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
}

.feature-item h4 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-primary);
}

.feature-item p {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    line-height: 1.6;
}

/* ===================================
   Section Divider
   =================================== */
.section-divider {
    border-top: 1px solid var(--color-border);
    border-bottom: 0px solid var(--color-border);
}

/* ===================================
   Board Selection Section
   =================================== */
.boards-section {
    padding: var(--spacing-3xl) 0;
}

.section-title {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.boards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--spacing-lg);
}

/* Board Card */
.board-card {
    position: relative;
    padding: var(--spacing-lg);
    cursor: pointer;
    overflow: hidden;
    background: rgba(255, 255, 255, 0.06);
}

.board-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--gradient-glow);
    opacity: 0;
    transition: opacity var(--transition-normal);
    z-index: -1;
}

.board-card:hover::before {
    opacity: 0.1;
}

.board-card.selected {
    border-color: var(--color-accent-primary);
    box-shadow: var(--shadow-glow);
}

.board-card.selected::before {
    opacity: 0.15;
}

.board-image {
    width: 100%;
    height: 140px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-lg);
    overflow: hidden;
}

.board-image img {
    max-width: 90%;
    max-height: 90%;
    object-fit: contain;
}

.board-image .placeholder-icon {
    font-size: 3rem;
    opacity: 0.5;
}

.board-name {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

.board-specs {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-sm);
}

.spec-item {
    display: flex;
    flex-direction: column;
    padding: var(--spacing-sm);
    background: var(--color-bg-secondary);
    border-radius: var(--radius-md);
}

.spec-label {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.spec-value {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text-primary);
}

.spec-item-full {
    grid-column: 1 / -1;
}

/* Selection indicator */
.selection-indicator {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    width: 24px;
    height: 24px;
    border-radius: 50%;
    border: 2px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.board-card.selected .selection-indicator {
    background: var(--color-accent-primary);
    border-color: var(--color-accent-primary);
}

.selection-indicator svg {
    width: 14px;
    height: 14px;
    opacity: 0;
    transform: scale(0);
    transition: all var(--transition-fast);
}

.board-card.selected .selection-indicator svg {
    opacity: 1;
    transform: scale(1);
}

/* ===================================
   Flash Section
   =================================== */
.flash-section {
    padding: var(--spacing-2xl) 0 var(--spacing-3xl);
}

.flash-card {
    padding: var(--spacing-2xl);
    text-align: center;
}

.selected-board {
    margin-bottom: var(--spacing-xl);
}

.no-selection {
    color: var(--color-text-muted);
    font-size: var(--font-size-lg);
}

.selected-board-info {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
}

.selected-board-name {
    font-size: var(--font-size-xl);
    font-weight: 600;
}

.selected-board-chip {
    padding: var(--spacing-xs) var(--spacing-md);
    background: var(--gradient-primary);
    border-radius: var(--radius-2xl);
    font-size: var(--font-size-sm);
    font-weight: 500;
}

/* Flash Button */
.flash-actions {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    font-weight: 600;
    border: none;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-normal);
}

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

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

.btn-primary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-secondary {
    background: var(--color-surface);
    color: var(--color-text-primary);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-sm);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--color-surface-hover);
    border-color: var(--color-border-hover);
    transform: translateY(-2px);
}

.btn-secondary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-large {
    padding: var(--spacing-lg) var(--spacing-2xl);
    font-size: var(--font-size-lg);
}

.btn-icon {
    width: 20px;
    height: 20px;
}

esp-web-install-button[disabled] {
    pointer-events: none;
}

/* ===================================
   Instructions Section
   =================================== */
.instructions-section {
    padding: var(--spacing-3xl) 0;
    background: var(--color-bg-secondary);
}

.steps-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: var(--spacing-lg);
}

.step-card {
    padding: var(--spacing-xl);
    text-align: center;
}

.step-number {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-lg);
    background: var(--gradient-primary);
    border-radius: 50%;
    font-size: var(--font-size-xl);
    font-weight: 700;
}

.step-card h4 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.step-card p {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

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

.footer-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: var(--spacing-lg);
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-weight: 600;
}

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

.footer-logo-text .version {
    font-size: var(--font-size-xs);
    color: var(--color-text-secondary);
    font-weight: 400;
    margin-left: var(--spacing-xs);
    -webkit-text-fill-color: var(--color-text-secondary);
}

.footer-text {
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
}

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

.footer-links a {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: var(--font-size-sm);
    transition: color var(--transition-fast);
}

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

/* ===================================
   Responsive Design
   =================================== */
@media (max-width: 768px) {
    .header .container {
        flex-direction: column;
        gap: var(--spacing-md);
    }

    .nav {
        gap: var(--spacing-lg);
    }

    .hero {
        padding-top: calc(140px + var(--spacing-2xl));
    }

    .hero-title {
        font-size: var(--font-size-3xl);
    }

    .hero-subtitle {
        font-size: var(--font-size-base);
    }

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

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

    .footer-content {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: var(--font-size-2xl);
    }

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

    .btn-large {
        padding: var(--spacing-md) var(--spacing-xl);
        font-size: var(--font-size-base);
    }
}

/* ===================================
   Animations
   =================================== */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes pulse {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.5;
    }
}

.board-card {
    animation: fadeIn 0.5s ease backwards;
}

.board-card:nth-child(1) {
    animation-delay: 0.1s;
}

.board-card:nth-child(2) {
    animation-delay: 0.15s;
}

.board-card:nth-child(3) {
    animation-delay: 0.2s;
}

.board-card:nth-child(4) {
    animation-delay: 0.25s;
}

.board-card:nth-child(5) {
    animation-delay: 0.3s;
}

.step-card {
    animation: fadeIn 0.5s ease backwards;
}

.step-card:nth-child(1) {
    animation-delay: 0.1s;
}

.step-card:nth-child(2) {
    animation-delay: 0.2s;
}

.step-card:nth-child(3) {
    animation-delay: 0.3s;
}

.step-card:nth-child(4) {
    animation-delay: 0.4s;
}