:root {
    --ink: #f5f4f2;
    --ink-soft: rgba(245, 244, 242, 0.75);
    --paper: #0c0c12;
    --paper-deep: #16161f;
    --accent: #29b38f;
    --accent-bright: #f36b3b;
    --glass: rgba(18, 18, 26, 0.8);
    --shadow: 0 24px 60px rgba(0, 0, 0, 0.45);
}

* {
    box-sizing: border-box;
}

html, body {
    height: 100%;
}

body {
    margin: 0;
    font-family: 'Newsreader', serif;
    color: var(--ink);
    background:
        radial-gradient(circle at 10% 20%, rgba(243, 107, 59, 0.25), transparent 40%),
        radial-gradient(circle at 90% 15%, rgba(41, 179, 143, 0.2), transparent 35%),
        linear-gradient(120deg, #0c0c12 0%, #151620 45%, #0b0c13 100%);
    overflow: hidden;
}

#app {
    position: relative;
    height: 100%;
}

.topbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 10;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 18px 5vw;
    backdrop-filter: blur(12px);
    background: var(--glass);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.brand-title {
    font-family: 'Unbounded', sans-serif;
    text-transform: uppercase;
    font-size: clamp(1rem, 2vw, 1.3rem);
    letter-spacing: 0.08em;
}

.brand-sub {
    font-size: 0.85rem;
    color: var(--accent-bright);
}

.topbar-actions {
    display: flex;
    gap: 12px;
    align-items: center;
}

.user-badge {
    background: rgba(255, 255, 255, 0.08);
    padding: 6px 12px;
    border-radius: 999px;
    font-size: 0.85rem;
}

.feed {
    height: 100vh;
    overflow-y: auto;
    padding: 110px 5vw 60px;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 360px));
    gap: 24px;
    justify-content: center;
    align-items: start;
}

.feed::after {
    content: '';
    display: block;
    height: 80px;
}

.feed-item {
    background: rgba(16, 16, 22, 0.9);
    border-radius: 18px;
    box-shadow: var(--shadow);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    animation: cardIn 0.6s ease both;
}

.feed-photo {
    width: 100%;
    aspect-ratio: 4 / 5;
    object-fit: cover;
}

.feed-body {
    padding: 14px 16px 18px;
    display: grid;
    gap: 8px;
}

.feed-caption {
    font-size: 0.95rem;
    color: var(--ink-soft);
}

.feed-meta {
    display: flex;
    justify-content: space-between;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: rgba(245, 244, 242, 0.55);
}

.composer {
    position: fixed;
    right: 5vw;
    bottom: 4vh;
    z-index: 8;
}

.composer-card {
    display: grid;
    gap: 10px;
    width: min(360px, 80vw);
    padding: 18px;
    border-radius: 18px;
    background: rgba(16, 16, 22, 0.95);
    box-shadow: var(--shadow);
}

.composer-title {
    font-family: 'Unbounded', sans-serif;
    text-transform: uppercase;
    font-size: 0.9rem;
    letter-spacing: 0.12em;
}

textarea,
input[type="text"],
input[type="email"],
input[type="password"] {
    width: 100%;
    padding: 10px 12px;
    border-radius: 10px;
    border: 1px solid rgba(255, 255, 255, 0.14);
    background: rgba(12, 12, 18, 0.85);
    font-family: 'Newsreader', serif;
    font-size: 0.95rem;
    color: var(--ink);
}

textarea::placeholder,
input::placeholder {
    color: rgba(245, 244, 242, 0.55);
}

.file-input {
    position: relative;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    font-size: 0.9rem;
}

.file-input input[type="file"] {
    position: absolute;
    opacity: 0;
    inset: 0;
    cursor: pointer;
}

.file-input span {
    background: rgba(255, 255, 255, 0.08);
    padding: 8px 14px;
    border-radius: 999px;
}

.primary-btn,
.ghost-btn {
    border: none;
    cursor: pointer;
    font-family: 'Unbounded', sans-serif;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.primary-btn {
    background: var(--accent);
    color: #fff;
    padding: 12px 14px;
    border-radius: 12px;
}

.ghost-btn {
    background: rgba(255, 255, 255, 0.08);
    padding: 8px 14px;
    border-radius: 999px;
    color: var(--ink);
}

.overlay {
    position: fixed;
    inset: 0;
    background: rgba(6, 6, 10, 0.7);
    display: grid;
    place-items: center;
    z-index: 9;
    backdrop-filter: blur(8px);
    animation: fadeIn 0.4s ease both;
}

.auth-panel {
    width: min(420px, 90vw);
    padding: 26px;
    border-radius: 20px;
    background: rgba(16, 16, 22, 0.96);
    box-shadow: var(--shadow);
    display: grid;
    gap: 16px;
}

.auth-tabs {
    display: flex;
    gap: 8px;
}

.tab-btn {
    flex: 1;
    padding: 10px;
    border-radius: 999px;
    border: 1px solid rgba(255, 255, 255, 0.12);
    background: transparent;
    font-family: 'Unbounded', sans-serif;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    cursor: pointer;
    font-size: 0.75rem;
    color: var(--ink);
}

.tab-btn.active {
    background: var(--accent-bright);
    color: #fff;
    border-color: transparent;
}

.auth-form {
    display: grid;
    gap: 10px;
}

.remember {
    display: flex;
    gap: 8px;
    align-items: center;
    font-size: 0.85rem;
}

.status-text {
    font-size: 0.85rem;
    color: var(--accent-bright);
    min-height: 1.2em;
}

.auth-hint {
    font-size: 0.85rem;
    color: rgba(245, 244, 242, 0.65);
}

.preview {
    border-radius: 14px;
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.12);
    background: rgba(0, 0, 0, 0.35);
}

.preview img {
    display: block;
    width: 100%;
    max-height: 240px;
    object-fit: cover;
}

.delete-btn {
    border: none;
    background: rgba(243, 107, 59, 0.15);
    color: #f6c2ad;
    padding: 6px 10px;
    border-radius: 999px;
    font-size: 0.7rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    cursor: pointer;
}

.comment-btn {
    border: none;
    background: rgba(41, 179, 143, 0.15);
    color: #b6f2df;
    padding: 6px 12px;
    border-radius: 999px;
    font-size: 0.7rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    cursor: pointer;
    justify-self: start;
}

.comments {
    margin-top: 10px;
    display: grid;
    gap: 10px;
    padding-top: 6px;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.comments-list {
    display: grid;
    gap: 8px;
}

.comment {
    display: grid;
    gap: 4px;
    font-size: 0.9rem;
    color: var(--ink-soft);
}

.comment strong {
    color: var(--ink);
    font-weight: 600;
}

.comment-hint {
    font-size: 0.85rem;
    color: rgba(245, 244, 242, 0.6);
}

.comments-form {
    display: grid;
    gap: 8px;
}

.hidden {
    display: none !important;
}

@keyframes cardIn {
    from {
        opacity: 0;
        transform: translateY(12px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

@media (max-width: 720px) {
    body {
        overflow: auto;
    }

    .composer {
        position: sticky;
        bottom: auto;
        right: auto;
        padding: 0 5vw 16px;
    }

    .composer-card {
        width: 100%;
        padding: 16px;
        gap: 12px;
    }

    .feed {
        height: auto;
        min-height: 100vh;
        grid-template-columns: 1fr;
        padding: 92px 5vw 16px;
        gap: 14px;
    }

    .topbar {
        padding: 14px 5vw;
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
        position: sticky;
    }

    .topbar-actions {
        width: 100%;
        justify-content: space-between;
        gap: 8px;
    }

    .brand-title {
        font-size: 0.95rem;
    }

    .brand-sub {
        font-size: 0.75rem;
    }

    .auth-panel {
        width: min(92vw, 420px);
        padding: 20px;
        gap: 12px;
    }

    .tab-btn {
        padding: 12px 10px;
        font-size: 0.7rem;
    }

    input[type="text"],
    input[type="email"],
    input[type="password"],
    textarea {
        font-size: 1rem;
        padding: 12px 12px;
    }

    .primary-btn,
    .ghost-btn {
        padding: 12px 14px;
        font-size: 0.75rem;
    }

    .feed-item {
        border-radius: 16px;
    }

    .feed-photo {
        aspect-ratio: 3 / 4;
    }

    .feed-body {
        padding: 12px 14px 14px;
    }

    .delete-btn {
        padding: 8px 12px;
        font-size: 0.65rem;
    }
}