/* Solarized Light Color Palette */
:root {
  --base03:  #002b36;
  --base02:  #073642;
  --base01:  #586e75;
  --base00:  #657b83;
  --base0:   #839496;
  --base1:   #93a1a1;
  --base2:   #eee8d5; /* Light background */
  --base3:   #fdf6e3; /* Lighter background */
  --yellow:  #b58900;
  --orange:  #cb4b16;
  --red:     #dc322f;
  --magenta: #d33682;
  --violet:  #6c71c4;
  --blue:    #268bd2;
  --cyan:    #2aa198;
  --green:   #859900;

  --theme-color: #FCCC0A; /* Project Specific */
  --text-color: var(--base01);
  --heading-color: var(--base02);
  --background-color: var(--base3);
  --secondary-background: var(--base2);
  --border-color: var(--base1);
  --link-color: var(--blue);
  --button-bg: var(--theme-color);
  --button-text: var(--base03);
  --error-bg: #f9d6d5; /* Light Red */
  --error-text: var(--red);
  --success-bg: #d4edda; /* Light Green */
  --success-text: var(--green);
}

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

html {
    font-size: 16px; /* Base font size */
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
    line-height: 1.6;
    background-color: var(--background-color);
    color: var(--text-color);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Layout Containers */
header, main, footer {
    width: 100%;
    max-width: 1600px; /* Max width for content */
    margin-left: auto;
    margin-right: auto;
    padding: 1rem 1.5rem; /* Responsive padding */
}

main {
    flex-grow: 1; /* Push footer down */
}

/* Header Styles */
header {
    border-bottom: 1px solid var(--secondary-background);
    margin-bottom: 1.5rem;
}

header h1 {
    color: var(--heading-color);
    font-size: 1.8rem;
    margin-bottom: 0.25rem;
}

header p {
    color: var(--base00);
    font-size: 1rem;
}

/* --- Gallery Waterfall/Masonry Layout (CSS Columns) --- */
.gallery {
    /* Define the minimum width for columns */
    /* Adjust 250px based on desired column width */
    column-width: 250px;

    /* Define the gap between columns */
    column-gap: 1rem;

    /* Remove grid properties */
    /* display: grid; */
    /* grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); */
    /* gap: 1rem; */
}

.gallery-item {
    /* Prevent items from breaking inside columns */
    break-inside: avoid;

    /* Add some space below each item */
    margin-bottom: 1rem;

    /* Keep other styles */
    background-color: var(--secondary-background);
    border-radius: 5px;
    overflow: hidden;
    box-shadow: 0 2px 5px rgba(0, 43, 54, 0.1);
    transition: transform 0.2s ease-in-out;
    width: 100%; /* Ensure item takes full column width */
}

.gallery-item:hover {
     transform: scale(1.03);
}


.gallery img {
    display: block; /* Remove extra space below image */
    width: 100%;
    height: auto; /* Maintain aspect ratio */
    /* object-fit: cover; */ /* Less relevant now, aspect ratio is key */
    /* min-height: 150px; */ /* Remove min-height if not desired */
    border-radius: inherit; /* Ensure image matches item border radius */
}
/* --- End Gallery Layout --- */


/* Placeholder Message */
.placeholder-message {
    /* Needs adjustment as it's no longer in a grid */
    /* grid-column: 1 / -1; */
    column-span: all; /* Make it span across all columns */
    text-align: center;
    padding: 3rem 1rem;
    color: var(--base0);
    background-color: var(--secondary-background);
    border-radius: 5px;
    margin-bottom: 1rem; /* Add margin if needed */
}


/* Footer Styles */
footer {
    margin-top: 2rem;
    padding-top: 1rem;
    border-top: 1px solid var(--secondary-background);
    text-align: center;
    color: var(--base0);
}

footer .author {
    margin-top: 1rem;
    font-size: 0.85rem;
}

/* Button Styles */
button {
    padding: 0.75rem 1.5rem;
    background-color: var(--button-bg);
    color: var(--button-text);
    border: none;
    border-radius: 4px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s ease;
}

button:hover {
    background-color: #e6b800; /* Darken theme color slightly */
}

/* Upload Form Styles */
#upload-form {
    background-color: var(--secondary-background);
    padding: 1.5rem;
    margin-top: 1rem;
    border-radius: 5px;
    text-align: left;
    border: 1px solid var(--border-color);
}

#upload-form h2 {
    color: var(--heading-color);
    margin-bottom: 1rem;
    text-align: center;
}
#upload-form p {
    margin-bottom: 1rem;
    text-align: center;
    font-size: 0.9rem;
}

#upload-form div {
    margin-bottom: 1rem;
}

#upload-form label {
    display: block;
    margin-bottom: 0.3rem;
    font-weight: 600;
    color: var(--base00);
}

#upload-form input[type="password"],
#upload-form input[type="file"] {
    width: 100%;
    padding: 0.6rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background-color: var(--base3);
    color: var(--text-color);
}
#upload-form input[type="file"] {
    padding: 0.3rem; /* Adjust padding for file input */
}

#upload-form small {
    display: block;
    margin-top: 0.4rem;
    font-size: 0.8rem;
    color: var(--base0);
}

#upload-form button[type="submit"] {
    display: block;
    width: 100%;
    margin-top: 1rem;
}

/* Helper Classes */
.hidden {
    display: none;
}

/* Status Messages */
.message {
    padding: 1rem;
    margin-bottom: 1.5rem;
    border-radius: 4px;
    text-align: center;
    /* Ensure message spans columns if gallery is empty */
    column-span: all;
}
.message.error {
    background-color: var(--error-bg);
    color: var(--error-text);
    border: 1px solid var(--red);
}
.message.success {
     background-color: var(--success-bg);
     color: var(--success-text);
     border: 1px solid var(--green);
}

/* Responsive Adjustments */
/* CSS Columns are inherently responsive based on column-width */
/* We can adjust column-width or add column-count overrides if needed */
@media (min-width: 768px) {
    html {
        font-size: 17px; /* Slightly larger base font on larger screens */
    }
     header h1 {
        font-size: 2.2rem;
    }
    .gallery {
        /* Example: Slightly wider columns on tablets */
        column-width: 280px;
    }
}

@media (min-width: 1200px) {
     .gallery {
        /* Example: Even wider columns on desktops */
       column-width: 320px;
    }
}