:root {
    --base: 1rem; /* 16px */
    --phi: 1.618;

    /* Vertical Rhythm & Spacing */
    --space-xs: calc(var(--base) * 0.618);   /* 1/φ */
    --space-sm: var(--base);                 /* 1 */
    --space-md: calc(var(--base) * var(--phi));       /* φ */
    --space-lg: calc(var(--base) * var(--phi) * var(--phi)); /* φ² ≈ 2.618 */

    /* Typography */
    --text-sm: calc(var(--base) * 0.85);
    --text-base: var(--base);
    --text-lg: calc(var(--base) * var(--phi));
    --text-xl: calc(var(--base) * var(--phi) * var(--phi));
    --text-xxl: calc(var(--base) * var(--phi) * var(--phi) * var(--phi));

       /* Button Specific */
    --btn-padding-v: var(--space-xs);        /* 0.618rem vertical */
    --btn-padding-h: calc(var(--space-sm) * 1.618); /* 1.618rem horizontal */
    --btn-radius: calc(var(--space-xs) * 0.618);    /* 0.618² ≈ 0.382rem */
    --btn-font-size: calc(var(--base) * 0.85);      /* Slightly smaller than base */
}
    

    /* Container Width (based on ideal reading line: 60-75 chars) */
    --container-narrow: 40rem;  /* ≈640px — base width */
    --container-wide: calc(40rem * var(--phi)); /* ≈1036px — for larger screens */
}





/* ===== THEME SHELF — BOOK-INSPIRED UI ===== */

.theme-shelf {
    margin-top: 30px;
    text-align: center;
}

.theme-shelf-label {
    font-size: 0.95rem;
    color: var(--text-color);
    margin-bottom: 20px;
    font-style: italic;
    letter-spacing: 0.5px;
    opacity: 0.9;
}

.theme-shelf-options {
    display: flex;
    justify-content: center;
    gap: 16px;
    flex-wrap: wrap;
    padding: 10px 0;
}

.theme-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: calc(var(--space-lg) * 3); /* φ² * 3 ≈ 8rem */
    padding: var(--space-sm) var(--space-xs); /* 1rem vertical, 0.618rem horizontal */
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: var(--space-sm); /* 1rem radius */
    cursor: pointer;
    transition: all 0.35s cubic-bezier(0.34, 1.56, 0.64, 1); /* Elastic φ-like curve */
    color: var(--text-color);
    font-family: Georgia, serif;
    text-align: center;
}

.theme-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.12);
    border-color: var(--text-color);
}

.theme-card.active {
    transform: scale(1.05) translateY(-5px);
    box-shadow: 0 12px 30px rgba(0,0,0,0.18);
    background: rgba(255,255,255,0.08);
    border-color: var(--text-color);
}

.theme-color {
    width: calc(var(--space-md) * 1.5); /* φ * 1.5 ≈ 2.4rem */
    height: calc(var(--space-md) * 2); /* φ * 2 ≈ 3.2rem */
    border-radius: calc(var(--space-xs) * 1.5);
    margin-bottom: var(--space-xs);
    box-shadow: inset 0 0 0 1px rgba(0,0,0,0.08);
    transition: transform 0.3s ease;
}

.theme-card:hover .theme-color {
    transform: scale(1.05);
}

.theme-name {
    font-size: 0.85rem;
    font-weight: 500;
    line-height: 1.3;
    transition: color 0.3s ease;
}

/* Dark Theme Adaptation */
body.theme-dark .theme-card {
    background: rgba(30,30,30,0.4);
}

/* Responsive */
@media (max-width: 600px) {
    .theme-shelf-options {
        gap: 12px;
    }
    .theme-card {
        width: 70px;
        padding: 14px 8px;
    }
    .theme-color {
        width: 35px;
        height: 45px;
    }
    .theme-name {
        font-size: 0.8rem;
    }
}





/* ===== THEME SYSTEM ===== */

/* Default: Light Theme */
:root {
    --bg-color: #F5F5F5;
    --text-color: #333333;
    --modal-bg: #FFFFFF;
    --surface-bg: rgba(255,255,255,0.8);
    --border-color: rgba(51,51,51,0.15);
}

/* Dark Theme */
body.theme-dark {
    --bg-color: #121212;
    --text-color: #E6E6E6;
    --modal-bg: #1E1E1E;
    --surface-bg: rgba(30,30,30,0.8);
    --border-color: rgba(230,230,230,0.15);
    background-image: none; /* Clean dark void */
}

/* Book Theme */
body.theme-book {
    --bg-color: #F8ECD4;
    --text-color: #5C4B33;
    --modal-bg: #FDF6E9;
    --surface-bg: rgba(253,246,233,0.85);
    --border-color: rgba(92,75,51,0.2);
}

/* Blue Light Filter Theme */
body.theme-blue-light {
    --bg-color: #FFF3E0;
    --text-color: #37474F;
    --modal-bg: #FFE0B2;
    --surface-bg: rgba(255,243,224,0.85);
    --border-color: rgba(55,71,79,0.2);
}

/* Apply theme to BODY */
body {
    background: var(--bg-color);
    color: var(--text-color);
    transition: background 0.35s ease, color 0.35s ease;
}

/* Apply theme to MODAL */
.modal-content {
    background: var(--modal-bg) !important;
    color: var(--text-color) !important;
    transition: all 0.35s ease;
}

/* Apply theme to HEADERS, FOOTERS, PREVIEW BLOCKS */
.site-header,
footer,
.preview-block,
.container {
    background: var(--surface-bg);
    color: var(--text-color);
    border-color: var(--border-color);
    transition: all 0.35s ease;
}

/* Apply theme to ALL TEXT ELEMENTS */
.poem-title,
.modal-title,
.preview-text,
.modal-full-text,
.read-more-btn,
.theme-switcher label,
#theme-select {
    color: var(--text-color);
    transition: color 0.35s ease;
}

/* Buttons & Select */
.read-more-btn {
    display: inline-block;
    padding: var(--btn-padding-v) var(--btn-padding-h); /* 0.618rem × 1.618rem */
    background: transparent;
    color: var(--text-color);
    border: 1px solid var(--border-color);
    border-radius: var(--btn-radius); /* Soft, organic curve */
    font-family: 'Georgia', serif;
    font-size: var(--btn-font-size); /* 0.85rem — subtle, elegant */
    font-weight: 500;
    cursor: pointer;
    transition: all 0.35s cubic-bezier(0.34, 1.56, 0.64, 1); /* Elastic φ-like easing */
    margin: var(--space-xs) 0; /* 0.618rem vertical margin */
    position: relative;
    overflow: hidden;
}

.read-more-btn:hover {
    background: var(--text-color);
    color: var(--bg-color);
    transform: translateY(calc(var(--space-xs) * -0.618)) scale(1.03); /* Lift + subtle scale */
    box-shadow: 0 calc(var(--space-xs) * 0.618) calc(var(--space-sm)) rgba(0,0,0,0.12);
    border-color: transparent;
}

.read-more-btn:active {
    transform: translateY(0) scale(1);
}

/* Add gentle "press" effect */
.read-more-btn:active {
    transform: translateY(calc(var(--space-xs) * 0.3)) scale(0.98);
}

.read-more-btn {
    /* ... existing styles ... */
    display: flex;
    align-items: center;
    gap: calc(var(--space-xs) * 0.618); /* 0.382rem gap */
}

.read-more-btn::after {
    content: "→";
    font-size: calc(var(--btn-font-size) * 0.85);
    opacity: 0.7;
    transition: transform 0.3s ease, opacity 0.3s ease;
    display: inline-block;
}

.read-more-btn:hover::after {
    transform: translateX(2px);
    opacity: 1;
}

#theme-select {
    background: var(--bg-color);
    border-color: var(--border-color);
}

#theme-select:hover {
    border-color: var(--text-color);
}

/* Scrollbar (optional, for WebKit browsers) */
body::-webkit-scrollbar-thumb {
    background: var(--text-color);
    border: 4px solid var(--bg-color);
}

body::-webkit-scrollbar-track {
    background: var(--bg-color);
}




/* Site Header */
.poem-title {
    font-size: var(--text-lg); /* φ * base */
    font-weight: normal;
    text-align: center;
    margin: 0 0 var(--space-sm); /* 1rem bottom margin */
    font-style: italic;
    color: var(--text-color);
    font-family: 'Georgia', serif;
    letter-spacing: 0.5px;
}

.modal-title {
    font-size: var(--text-xl); /* φ² */
    font-weight: normal;
    text-align: center;
    margin: 0 0 var(--space-md); /* φ */
    font-style: italic;
    color: var(--text-color);
    font-family: 'Georgia', serif;
}

.site-header {
    text-align: center;
    padding: var(--space-lg) var(--space-md); /* φ² vertical, φ horizontal */
    margin-bottom: var(--space-md); /* φ */
    border-bottom: 1px solid var(--border-color);
}

.site-header h1 {
    font-family: 'Georgia', serif;
    font-size: 2.8rem;
    font-weight: normal;
    letter-spacing: 1px;
    color: #222;
    margin: 0 0 15px;
}

.site-header p {
    font-family: 'Georgia', serif;
    font-size: 1.1rem;
    font-style: italic;
    color: #777;
    margin: 0;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* Adjust body padding to avoid extra space at top */
body {
    font-family: 'Georgia', serif;
    line-height: 1.618; /* Golden line height */
    color: var(--text-color);
    background: var(--bg-color);
    padding: var(--space-lg) var(--space-md); /* φ² top/bottom, φ sides */
    margin: 0;
}

/* Optional: Reduce top padding on container since header adds space */
.container {
    max-width: var(--container-narrow);
    margin: 0 auto;
    padding: var(--space-md) 0; /* φ spacing above/below */
}

/* Wider container on large screens */
@media (min-width: 768px) {
    .container {
        max-width: var(--container-wide);
        padding: var(--space-lg) 0; /* φ² spacing */
    }
}


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

//body {
    font-family: 'Georgia', serif;
    line-height: 1.8;
    color: #222;
    background: #fcfaf7;
    padding: 60px 20px 100px;
}

.container {
    max-width: 700px;
    margin: 0 auto;
}//

/* Preview Block */
.preview-block {
    margin: var(--space-md) 0; /* φ vertical rhythm */
    padding: var(--space-md); /* φ padding */
    background: var(--surface-bg);
    border-radius: calc(var(--space-xs) * 2); /* 0.618 * 2 */
    box-shadow: 0 calc(var(--space-xs) / 2) calc(var(--space-sm)) rgba(0,0,0,0.05);
    transition: all 0.3s ease;
}

.preview-text {
    font-size: var(--text-base);
    line-height: 1.618;
    white-space: pre-line;
    margin-bottom: var(--space-sm);
    color: var(--text-color);
}



/* Modal Overlay */
.modal-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.88);
    z-index: 1000;
    padding: 30px;
    overflow-y: auto;
    cursor: default;
}

.modal-content {
    background: var(--modal-bg);
    color: var(--text-color);
    max-width: calc(var(--container-narrow) * 0.85); /* 85% of base container */
    margin: var(--space-lg) auto; /* φ² margin */
    padding: var(--space-lg); /* φ² padding */
    border-radius: calc(var(--space-sm) * 0.618); /* subtle curve */
    box-shadow: 0 calc(var(--space-sm) * 0.618) calc(var(--space-md)) rgba(0,0,0,0.3);
    position: relative;
    animation: modalFadeIn 0.4s ease;
    transition: all 0.35s ease;
    line-height: 1.618;
}

@keyframes modalFadeIn {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

.modal-close {
    position: absolute;
    top: 25px;
    right: 30px;
    font-size: 32px;
    color: #999;
    cursor: pointer;
    transition: color 0.3s;
}

.modal-close:hover {
    color: #fff;
}

.modal-full-text {
    font-size: var(--text-lg); /* φ */
    line-height: 1.618;
    white-space: pre-line;
    text-align: left;
}
/* Footer */
footer {
    text-align: center;
    padding: var(--space-lg) var(--space-md); /* φ² vertical, φ horizontal */
    margin-top: var(--space-lg); /* φ² */
    border-top: 1px dashed var(--border-color);
    font-size: var(--text-sm); /* 0.85rem */
}

/* Responsive */
@media (max-width: 600px) {
    .site-header h1 {
    font-size: 2.2rem;
}

.site-header p {
    font-size: 1rem;
    padding: 0 15px;
}
    body { padding: 40px 15px 80px; }
    .preview-block { padding: 25px; }
    .modal-content { padding: 30px 20px; margin: 60px auto; }
    .modal-full-text { font-size: 1.15rem; }
    .modal-close { font-size: 28px; top: 15px; right: 15px; }
}