/* ====================================
   CSS Variables - DARK THEME Color Palette
   ==================================== */
:root {
    /* Dark nostalgic colors - nocny pamiętnik */
    --color-bg-dark: #1a1612;
    --color-bg-medium: #2a241f;
    --color-paper-dark: #332d26;
    --color-paper: #3d362e;
    
    --color-text-primary: #e8dfd2;
    --color-text-secondary: #c4b5a0;
    --color-text-muted: #9d8b7a;
    
    --color-sepia: #d4a574;
    --color-accent: #c4976f;
    --color-accent-light: #e5c9a8;
    
    /* Candle colors - bardziej widoczne na ciemnym tle */
    --color-flame: #ffa500;
    --color-flame-bright: #ffcc00;
    --color-flame-core: #fff5e6;
    --color-smoke: rgba(228, 201, 168, 0.25);
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 3rem;
    --spacing-xl: 4rem;
    
    /* Typography */
    --font-serif: 'Playfair Display', serif;
    --font-body: 'Crimson Text', serif;
    
    /* Shadows - dostosowane do ciemnego tła */
    --shadow-soft: 0 2px 12px rgba(0, 0, 0, 0.4);
    --shadow-medium: 0 4px 20px rgba(0, 0, 0, 0.6);
    --glow-warm: 0 0 20px rgba(212, 165, 116, 0.3);
}

/* ====================================
   Global Resets & Base Styles
   ==================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    background-color: var(--color-bg-dark);
    color: var(--color-text-primary);
    line-height: 1.7;
    font-size: 18px;
    overflow-x: hidden;
}

/* Subtle paper texture overlay */
.page-texture {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        repeating-linear-gradient(
            0deg,
            transparent,
            transparent 2px,
            rgba(228, 201, 168, 0.03) 2px,
            rgba(228, 201, 168, 0.03) 4px
        );
    pointer-events: none;
    z-index: 1;
    opacity: 0.5;
}

/* ====================================
   CANDLE ANIMATION (Widoczna na ciemnym tle!)
   ==================================== */
.candle-scene {
    position: fixed;
    top: 15%;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    height: 200px;
    z-index: 0;
    opacity: 0.7;
    pointer-events: none;
    filter: drop-shadow(var(--glow-warm));
}

/* Candle body */
.candle-body {
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 30px;
    height: 80px;
    background: linear-gradient(to bottom, 
        rgba(212, 165, 116, 0.6), 
        rgba(212, 165, 116, 0.8));
    border-radius: 3px 3px 0 0;
    box-shadow: 0 0 15px rgba(212, 165, 116, 0.3);
}

/* Flame */
.flame {
    position: absolute;
    bottom: 75px;
    left: 50%;
    transform: translateX(-50%);
    width: 22px;
    height: 40px;
    background: linear-gradient(to top, 
        var(--color-flame) 0%, 
        var(--color-flame-bright) 50%, 
        var(--color-flame-core) 100%);
    border-radius: 50% 50% 50% 50% / 60% 60% 40% 40%;
    animation: flicker 2s ease-in-out infinite;
    filter: blur(1px);
    box-shadow: 
        0 0 20px rgba(255, 165, 0, 0.8),
        0 0 40px rgba(255, 165, 0, 0.4);
}

.flame-glow {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 50px;
    height: 60px;
    background: radial-gradient(circle, 
        rgba(255, 204, 0, 0.6) 0%, 
        rgba(255, 165, 0, 0.3) 40%,
        transparent 70%);
    border-radius: 50%;
    animation: glow 2s ease-in-out infinite;
}

/* Smoke trails rising up - bardziej widoczne */
.smoke-trail {
    position: absolute;
    bottom: 115px;
    left: 50%;
    width: 4px;
    height: 80px;
    background: linear-gradient(to top, 
        var(--color-smoke), 
        transparent);
    border-radius: 50%;
    animation: smoke-rise 4s ease-in-out infinite;
    opacity: 0;
}

/* ====================================
   CANDLE ANIMATIONS
   ==================================== */
@keyframes flicker {
    0%, 100% {
        transform: translateX(-50%) scale(1, 1);
        opacity: 1;
    }
    25% {
        transform: translateX(-50%) scale(0.95, 1.05);
        opacity: 0.9;
    }
    50% {
        transform: translateX(-50%) scale(1.02, 0.98);
        opacity: 1;
    }
    75% {
        transform: translateX(-50%) scale(0.98, 1.02);
        opacity: 0.95;
    }
}

@keyframes glow {
    0%, 100% {
        opacity: 0.4;
        transform: translate(-50%, -50%) scale(1);
    }
    50% {
        opacity: 0.7;
        transform: translate(-50%, -50%) scale(1.3);
    }
}

@keyframes smoke-rise {
    0% {
        opacity: 0;
        transform: translateY(0) translateX(-50%) scale(0.8);
    }
    10% {
        opacity: 0.6;
    }
    70% {
        opacity: 0.3;
        transform: translateY(-120px) translateX(-50%) scale(2);
    }
    100% {
        opacity: 0;
        transform: translateY(-180px) translateX(-50%) scale(3);
    }
}

/* ====================================
   Hero Section
   ==================================== */
.hero {
    min-height: 85vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: var(--spacing-md);
    position: relative;
    background: linear-gradient(to bottom, 
        var(--color-bg-medium), 
        var(--color-bg-dark));
    border-bottom: 1px solid rgba(212, 165, 116, 0.2);
}

.hero-content {
    max-width: 700px;
    z-index: 2;
    animation: fadeInUp 1.2s ease-out;
}

.main-title {
    font-family: var(--font-serif);
    font-size: clamp(3rem, 8vw, 5.5rem);
    font-weight: 500;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-sm);
    letter-spacing: -0.02em;
    line-height: 1.1;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.5);
}

.subtitle {
    font-size: clamp(1.1rem, 3vw, 1.4rem);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-lg);
    font-style: italic;
    font-weight: 400;
}

.cta-button {
    background-color: var(--color-sepia);
    color: var(--color-bg-dark);
    border: none;
    padding: 1rem 2.5rem;
    font-size: 1.1rem;
    font-family: var(--font-body);
    font-weight: 600;
    cursor: pointer;
    border-radius: 2px;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-soft);
    letter-spacing: 0.03em;
}

.cta-button:hover {
    background-color: var(--color-accent-light);
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium), var(--glow-warm);
}

/* ====================================
   Container & Layout
   ==================================== */
.container {
    max-width: 900px;
    margin: 0 auto;
    padding: var(--spacing-xl) var(--spacing-md);
    position: relative;
    z-index: 2;
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.section-header h2 {
    font-family: var(--font-serif);
    font-size: clamp(2rem, 5vw, 2.8rem);
    font-weight: 500;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-sm);
    letter-spacing: -0.01em;
}

.section-description {
    color: var(--color-text-secondary);
    font-size: 1.1rem;
    font-style: italic;
}

/* ====================================
   Write Letter Section (Form)
   ==================================== */
.write-section {
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-lg);
    background-color: rgba(61, 54, 46, 0.5);
    border: 1px solid rgba(212, 165, 116, 0.3);
    box-shadow: var(--shadow-soft);
    animation: fadeIn 0.8s ease-out 0.3s both;
    backdrop-filter: blur(10px);
}

.letter-form {
    max-width: 700px;
    margin: 0 auto;
}

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 600;
    color: var(--color-text-primary);
    font-size: 1rem;
}

.form-group textarea,
.form-group input[type="text"] {
    width: 100%;
    padding: 1rem;
    font-family: var(--font-body);
    font-size: 1.05rem;
    color: var(--color-text-primary);
    background-color: rgba(26, 22, 18, 0.6);
    border: 1px solid rgba(212, 165, 116, 0.4);
    border-radius: 2px;
    transition: all 0.3s ease;
    resize: vertical;
}

.form-group textarea {
    min-height: 200px;
    line-height: 1.8;
}

.form-group textarea:focus,
.form-group input[type="text"]:focus {
    outline: none;
    border-color: var(--color-sepia);
    box-shadow: 0 0 0 3px rgba(212, 165, 116, 0.2);
    background-color: rgba(26, 22, 18, 0.8);
}

.char-counter {
    text-align: right;
    font-size: 0.9rem;
    color: var(--color-text-muted);
    margin-top: var(--spacing-xs);
}

.submit-button {
    width: 100%;
    background-color: var(--color-sepia);
    color: var(--color-bg-dark);
    border: none;
    padding: 1.2rem 2rem;
    font-size: 1.15rem;
    font-family: var(--font-body);
    font-weight: 600;
    cursor: pointer;
    border-radius: 2px;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-soft);
    letter-spacing: 0.03em;
    margin-top: var(--spacing-sm);
}

.submit-button:hover:not(:disabled) {
    background-color: var(--color-accent-light);
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium), var(--glow-warm);
}

.submit-button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.success-message {
    background-color: rgba(212, 165, 116, 0.15);
    border: 1px solid var(--color-accent);
    padding: var(--spacing-md);
    border-radius: 2px;
    text-align: center;
    margin-top: var(--spacing-md);
    animation: slideDown 0.5s ease-out;
}

.success-message p {
    color: var(--color-accent-light);
    font-size: 1.1rem;
    font-style: italic;
}

/* ====================================
   Letters Feed Section
   ==================================== */
.letters-feed {
    margin-top: var(--spacing-xl);
}

.random-button {
    background-color: transparent;
    color: var(--color-sepia);
    border: 1px solid var(--color-accent);
    padding: 0.6rem 1.5rem;
    font-size: 0.95rem;
    font-family: var(--font-body);
    cursor: pointer;
    border-radius: 2px;
    transition: all 0.3s ease;
    margin-left: var(--spacing-sm);
}

.random-button:hover {
    background-color: var(--color-sepia);
    color: var(--color-bg-dark);
    box-shadow: var(--glow-warm);
}

.letters-container {
    display: grid;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.letter-card {
    background-color: rgba(61, 54, 46, 0.5);
    border: 1px solid rgba(212, 165, 116, 0.3);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-soft);
    transition: all 0.4s ease;
    animation: fadeInScale 0.6s ease-out both;
    position: relative;
    backdrop-filter: blur(10px);
}

.letter-card::before {
    content: '"';
    position: absolute;
    top: 10px;
    left: 15px;
    font-family: var(--font-serif);
    font-size: 4rem;
    color: rgba(212, 165, 116, 0.15);
    line-height: 1;
}

.letter-card:hover {
    box-shadow: var(--shadow-medium), var(--glow-warm);
    transform: translateY(-3px);
    border-color: rgba(212, 165, 116, 0.5);
}

.letter-content {
    font-size: 1.05rem;
    line-height: 1.8;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-sm);
    white-space: pre-wrap;
    word-wrap: break-word;
}

.letter-signature {
    text-align: right;
    font-style: italic;
    color: var(--color-text-secondary);
    font-size: 1rem;
    margin-top: var(--spacing-sm);
}

.letter-date {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    text-align: right;
    margin-top: var(--spacing-xs);
}

.loading-state {
    text-align: center;
    padding: var(--spacing-lg);
    color: var(--color-text-secondary);
    font-style: italic;
}

.no-letters {
    text-align: center;
    padding: var(--spacing-xl);
    color: var(--color-text-secondary);
    font-style: italic;
}

/* ====================================
   Footer
   ==================================== */
.footer {
    margin-top: var(--spacing-xl);
    padding: var(--spacing-lg) var(--spacing-md);
    background-color: var(--color-bg-medium);
    border-top: 1px solid rgba(212, 165, 116, 0.2);
    position: relative;
    z-index: 2;
}

.footer-content {
    max-width: 900px;
    margin: 0 auto;
    text-align: center;
}

.footer-text {
    font-size: 1rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-sm);
}

.instagram-link {
    display: inline-block;
    color: var(--color-sepia);
    text-decoration: none;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    transition: color 0.3s ease;
}

.instagram-link:hover {
    color: var(--color-accent-light);
}

.footer-note {
    font-size: 0.95rem;
    color: var(--color-text-secondary);
    font-style: italic;
    margin-top: var(--spacing-sm);
}

/* ====================================
   Animations
   ==================================== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes fadeInScale {
    from {
        opacity: 0;
        transform: scale(0.95);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ====================================
   Responsive Design
   ==================================== */
@media (max-width: 768px) {
    .candle-scene {
        opacity: 0.5;
        top: 12%;
        transform: translateX(-50%) scale(0.8);
    }
    
    .hero {
        min-height: 75vh;
        padding: var(--spacing-sm);
    }
    
    .main-title {
        font-size: 3rem;
    }
    
    .subtitle {
        font-size: 1.1rem;
    }
    
    .container {
        padding: var(--spacing-md) var(--spacing-sm);
    }
    
    .write-section {
        padding: var(--spacing-md);
    }
    
    .section-header h2 {
        font-size: 2rem;
    }
    
    .random-button {
        display: block;
        margin: var(--spacing-sm) auto 0;
    }
    
    .letter-card {
        padding: var(--spacing-sm);
    }
}

@media (max-width: 480px) {
    body {
        font-size: 16px;
    }
    
    .candle-scene {
        opacity: 0.4;
        transform: translateX(-50%) scale(0.6);
    }
    
    .main-title {
        font-size: 2.5rem;
    }
    
    .cta-button {
        padding: 0.9rem 2rem;
        font-size: 1rem;
    }
    
    .form-group textarea {
        min-height: 180px;
        font-size: 1rem;
    }
}

/* ====================================
   Staggered Animation for Letters
   ==================================== */
.letter-card:nth-child(1) { animation-delay: 0.1s; }
.letter-card:nth-child(2) { animation-delay: 0.2s; }
.letter-card:nth-child(3) { animation-delay: 0.3s; }
.letter-card:nth-child(4) { animation-delay: 0.4s; }
.letter-card:nth-child(5) { animation-delay: 0.5s; }
.letter-card:nth-child(n+6) { animation-delay: 0.6s; }