/* 1. Basic settings */
* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: Arial, Helvetica, sans-serif;
    background-color: #0b0d14;
    color: #f5f5f5;
    line-height: 1.6;
}

/* 2. Website header */
header {
    background-color: #121522;
    padding: 20px 7%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid #272b3b;
}

header h1 {
    margin: 0;
    color: #a78bfa;
    font-size: 28px;
}

nav {
    display: flex;
    gap: 24px;
}

nav a {
    color: #d1d5e5;
    text-decoration: none;
    font-weight: bold;
}

nav a:hover {
    color: #a78bfa;
}

/* 3. Main content */
main {
    max-width: 1200px;
    width: 86%;
    margin: 0 auto;
}

/* 4. Hero section */
#home {
    padding: 65px 35px;
    margin: 30px 0;
    border-radius: 18px;
    background: linear-gradient(135deg, #252044, #161a2c, #10121b);
    border: 1px solid #302b50;
}

#home > p:first-child {
    color: #c4b5fd;
    font-size: 12px;
    font-weight: bold;
    letter-spacing: 3px;
}

#home h2 {
    font-size: clamp(30px, 5vw, 48px);
    line-height: 1.2;
    margin: 15px 0;
}

#home p:last-child {
    color: #b7bbce;
}

/* 5. Movie section */
#movies,
#playlist {
    padding: 25px 0;
    margin-bottom: 25px;
}

#movies > h2,
#playlist > h2 {
    font-size: 28px;
    margin-bottom: 18px;
}

/* 6. Search field */
#movie-search {
    display: block;
    width: 100%;
    max-width: 430px;
    padding: 13px 15px;
    margin: 10px 0 25px;
    background-color: #171a28;
    border: 1px solid #353a50;
    border-radius: 8px;
    color: white;
    font-size: 15px;
}

#movie-search:focus {
    outline: 2px solid #a78bfa;
    border-color: transparent;
}

/* 7. Movie cards */
.movie-list {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 22px;
}

.movie-card {
    background-color: #151824;
    border: 1px solid #292e41;
    border-radius: 14px;
    padding: 16px;
    transition: transform 0.2s, border-color 0.2s;
}

.movie-card:hover {
    transform: translateY(-5px);
    border-color: #8b78d9;
}

.poster {
    height: 150px;
    display: flex;
    justify-content: center;
    align-items: center;
    background: linear-gradient(135deg, #282443, #1a2034);
    border-radius: 10px;
    font-size: 48px;
}

.movie-card h3 {
    font-size: 20px;
    margin: 14px 0 5px;
}

.movie-card p {
    color: #a9afc3;
    font-size: 14px;
    margin: 7px 0;
}

/* 8. Buttons */
button {
    margin-top: 12px;
    padding: 11px 14px;
    width: 100%;
    border: none;
    border-radius: 8px;
    background-color: #8b78e6;
    color: white;
    font-size: 14px;
    font-weight: bold;
    cursor: pointer;
}

button:hover {
    background-color: #735dd0;
}

/* 9. Playlist section */
#playlist {
    background-color: #151824;
    border: 1px solid #292e41;
    border-radius: 14px;
    padding: 25px;
}

#playlist p {
    color: #b7bbce;
}

/* 10. Footer */
footer {
    margin-top: 45px;
    padding: 25px 7%;
    text-align: center;
    color: #9298ad;
    background-color: #121522;
    border-top: 1px solid #272b3b;
}

/* 11. Mobile responsive design */
@media (max-width: 700px) {
    header {
        padding: 18px 7%;
        flex-direction: column;
        gap: 12px;
    }

    nav {
        gap: 18px;
        flex-wrap: wrap;
        justify-content: center;
    }

    main {
        width: 90%;
    }

    #home {
        padding: 35px 22px;
    }

    .movie-list {
        grid-template-columns: 1fr;
    }
}
/* Individual movie item in the playlist */
.playlist-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    padding: 12px 0;
    border-bottom: 1px solid #292e41;
}

.playlist-item p {
    margin: 0;
}

.playlist-item button {
    width: auto;
    min-width: 90px;
    margin-top: 0;
}

#playlist-summary {
    margin-top: 20px;
    font-weight: bold;
}

@media (max-width: 700px) {
    .playlist-item {
        flex-direction: column;
        align-items: stretch;
    }
}
#undo-button {
    width: auto;
    margin: 0 0 20px;
    padding: 10px 18px;
}

#undo-button:disabled {
    opacity: 0.45;
    cursor: not-allowed;
}
/* Upcoming Queue section */
#upcoming-queue {
    background-color: #151824;
    border: 1px solid #292e41;
    border-radius: 14px;
    padding: 25px;
    margin: 30px 0;
}

#queue-items {
    margin: 20px 0;
}

.queue-button {
    background-color: #293047;
    border: 1px solid #454d6b;
}

.queue-button:hover {
    background-color: #38415d;
}

#play-next-button {
    width: auto;
    min-width: 180px;
}

#play-next-button:disabled {
    opacity: 0.45;
    cursor: not-allowed;
}
/* Movie Tree Explorer */
#movie-tree {
    background-color: #151824;
    border: 1px solid #292e41;
    border-radius: 14px;
    padding: 25px;
    margin: 30px 0;
}

#tree-controls {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin: 20px 0;
}

#tree-controls button {
    width: auto;
    margin: 0;
}

#tree-results {
    padding-left: 28px;
    line-height: 2;
    color: #d1d5e5;
}

#tree-search-input {
    display: block;
    width: 100%;
    max-width: 430px;
    padding: 13px;
    margin: 12px 0;
    border-radius: 8px;
    border: 1px solid #353a50;
    background-color: #171a28;
    color: white;
    font-size: 15px;
}

#tree-search-button {
    width: auto;
}

#tree-search-result {
    color: #c4b5fd;
    overflow-wrap: anywhere;
}

/* Movie Graph Explorer */
#movie-graph {
    background-color: #151824;
    border: 1px solid #292e41;
    border-radius: 14px;
    padding: 25px;
    margin: 30px 0;
}

#graph-start {
    display: block;
    width: 100%;
    max-width: 430px;
    padding: 12px;
    margin: 12px 0 20px;
    background-color: #171a28;
    color: white;
    border: 1px solid #353a50;
    border-radius: 8px;
    font-size: 15px;
}

#graph-controls {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

#graph-controls button {
    width: auto;
    margin: 0;
}

#graph-results {
    padding-left: 28px;
    line-height: 2;
    color: #d1d5e5;
}

#graph-info {
    color: #a9afc3;
    font-size: 14px;
}

/* Movie Graph Explorer */
#movie-graph {
    background-color: #151824;
    border: 1px solid #292e41;
    border-radius: 14px;
    padding: 25px;
    margin: 30px 0;
}

#graph-start {
    display: block;
    width: 100%;
    max-width: 430px;
    padding: 12px;
    margin: 12px 0 20px;
    background-color: #171a28;
    color: white;
    border: 1px solid #353a50;
    border-radius: 8px;
    font-size: 15px;
}

#graph-controls {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

#graph-controls button {
    width: auto;
    margin: 0;
}

#graph-results {
    padding-left: 28px;
    line-height: 2;
    color: #d1d5e5;
}

#graph-info {
    color: #a9afc3;
    font-size: 14px;
}

/* Movie sorting controls */
#sort-controls {
    background-color: #151824;
    border: 1px solid #292e41;
    border-radius: 14px;
    padding: 20px;
    margin: 25px 0;
}

#sort-controls h3 {
    margin-top: 0;
}

#sort-controls p {
    color: #b7bbce;
}

.sort-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin: 18px 0;
}

.sort-buttons button {
    width: auto;
    margin-top: 0;
}

#sort-status {
    overflow-wrap: anywhere;
    font-size: 14px;
    margin-bottom: 0;
}

@media (max-width: 700px) {
    .sort-buttons {
        flex-direction: column;
    }

    .sort-buttons button {
        width: 100%;
    }
}

/* Movie Marathon Planner */
#marathon-planner {
    background-color: #151824;
    border: 1px solid #292e41;
    border-radius: 14px;
    padding: 25px;
    margin: 30px 0;
}

#marathon-planner label {
    display: block;
    margin: 18px 0 8px;
    color: #d1d5e5;
}

#available-minutes {
    display: block;
    width: 100%;
    max-width: 320px;
    padding: 12px;
    background-color: #171a28;
    color: white;
    border: 1px solid #353a50;
    border-radius: 8px;
    font-size: 16px;
    margin-bottom: 12px;
}

#plan-marathon {
    width: auto;
}

#marathon-summary {
    color: #c4b5fd;
    font-weight: bold;
    margin-top: 20px;
    overflow-wrap: anywhere;
}

#marathon-planner ul {
    padding-left: 25px;
    line-height: 2;
    color: #d1d5e5;
}

#marathon-planner h3 {
    margin-top: 25px;
}

/* Search Algorithms Explorer */
#algorithm-search {
    background-color: #151824;
    border: 1px solid #292e41;
    border-radius: 14px;
    padding: 25px;
    margin: 30px 0;
}

#algorithm-search label {
    display: block;
    margin: 18px 0 8px;
    color: #d1d5e5;
}

#algorithm-search-input {
    display: block;
    width: 100%;
    max-width: 430px;
    padding: 12px;
    margin: 12px 0 18px;
    background-color: #171a28;
    border: 1px solid #353a50;
    border-radius: 8px;
    color: white;
    font-size: 15px;
}

.algorithm-search-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.algorithm-search-buttons button {
    width: auto;
    margin-top: 0;
}

#algorithm-search-result {
    margin-top: 20px;
    color: #c4b5fd;
    overflow-wrap: anywhere;
}

@media (max-width: 700px) {
    .algorithm-search-buttons {
        flex-direction: column;
    }

    .algorithm-search-buttons button {
        width: 100%;
    }
}

/* Movie poster images */
.poster {
    height: 300px;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #252443, #171a28);
    border-radius: 10px;
}

.poster img {
    width: 100%;
    height: 100%;
    display: block;
    object-fit: contain;
    border-radius: 10px;
    transition: transform 0.3s ease;
}

/* Smooth poster hover effect */
.movie-card:hover .poster img {
    transform: scale(1.04);
}

/* Make movie cards feel more polished */
.movie-card {
    overflow: hidden;
}

.movie-card h3 {
    margin-top: 16px;
}

.movie-card button {
    transition: background-color 0.2s ease,
                transform 0.2s ease;
}

.movie-card button:hover {
    transform: translateY(-1px);
}

/* ===== CineQueue: Professional Movie Cards ===== */

.movie-list {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 24px;
    align-items: stretch;
}

.movie-card {
    background: linear-gradient(180deg, #191c2b, #11131c);
    border: 1px solid #2d3247;
    border-radius: 16px;
    padding: 14px;
    overflow: hidden;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.18);
    transition:
        transform 0.25s ease,
        border-color 0.25s ease,
        box-shadow 0.25s ease;
}

.movie-card:hover {
    transform: translateY(-6px);
    border-color: #8b78e6;
    box-shadow: 0 14px 32px rgba(0, 0, 0, 0.3);
}

/* Poster container */
.movie-card .poster {
    height: 300px;
    width: 100%;
    margin-bottom: 14px;
    overflow: hidden;
    background: #0c0e15;
    border-radius: 12px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.movie-card .poster img {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: contain;
    border-radius: 12px;
    transition: transform 0.3s ease;
}

.movie-card:hover .poster img {
    transform: scale(1.04);
}

/* Movie title */
.movie-card h3 {
    font-size: 21px;
    line-height: 1.3;
    color: #ffffff;
    margin: 8px 0 10px;
}

/* Genre and release year */
.movie-card p:nth-of-type(1) {
    display: inline-block;
    width: fit-content;
    max-width: 100%;
    background: #26213f;
    color: #c4b5fd;
    border-radius: 20px;
    padding: 5px 10px;
    font-size: 12px;
    font-weight: 600;
}

/* Movie duration */
.movie-card p:nth-of-type(2) {
    color: #b7bbce;
    font-size: 13px;
    margin-bottom: 8px;
}

/* Buttons inside cards */
.movie-card button {
    width: 100%;
    border-radius: 9px;
    padding: 12px;
    font-size: 13px;
    letter-spacing: 0.2px;
}

/* Tablet layout */
@media (max-width: 900px) {
    .movie-list {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 18px;
    }
}

/* Mobile layout */
@media (max-width: 560px) {
    .movie-list {
        grid-template-columns: 1fr;
    }

    .movie-card .poster {
        height: 320px;
    }

    .movie-card h3 {
        font-size: 20px;
    }
}

/* Add New Movie Form */
#add-movie-section {
    background: linear-gradient(135deg, #191c2b, #11131c);
    border: 1px solid #2d3247;
    border-radius: 16px;
    padding: 25px;
    margin: 30px 0;
}

#add-movie-section > p {
    color: #b7bbce;
}

.add-movie-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
    margin-top: 22px;
}

#add-movie-form label {
    display: block;
    color: #d1d5e5;
    font-size: 14px;
    font-weight: bold;
}

#add-movie-form input {
    display: block;
    width: 100%;
    margin-top: 8px;
    padding: 12px;
    background: #171a28;
    color: white;
    border: 1px solid #353a50;
    border-radius: 8px;
    font-size: 14px;
}

#add-movie-form input:focus {
    outline: 2px solid #8b78e6;
    border-color: transparent;
}

.add-movie-grid .full-width {
    grid-column: 1 / -1;
}

#add-movie-form button {
    width: auto;
    margin-top: 22px;
}

#add-movie-status {
    color: #c4b5fd;
    overflow-wrap: anywhere;
}

@media (max-width: 600px) {
    .add-movie-grid {
        grid-template-columns: 1fr;
    }

    .add-movie-grid .full-width {
        grid-column: auto;
    }

    #add-movie-form button {
        width: 100%;
    }
}

/* CineQueue developer credit and footer */
.site-footer {
    margin-top: 50px;
    padding: 32px 20px;
    text-align: center;
    border-top: 1px solid #292e41;
    background: #11131c;
    color: #b7bbce;
    border-radius: 14px 14px 0 0;
}

.site-footer h3 {
    color: #b6a5ff;
    font-size: 24px;
    margin-bottom: 12px;
}

.site-footer p {
    font-size: 13px;
    line-height: 1.7;
    margin: 6px 0;
}

.site-footer strong {
    color: #ffffff;
}

.site-footer .copyright {
    color: #c4b5fd;
    margin-top: 20px;
    font-weight: 600;
}

.site-footer .academic-note {
    max-width: 650px;
    margin: 10px auto 0;
    font-size: 12px;
}