/* ===================== Tokens de tema ===================== */

:root,
:root[data-theme="dark"] {
    /* Tron / neon azul / glass, sobre navy quase-preto — tema padrão */
    --bg: #070b16;
    --bg-glow-1: rgba(34, 211, 238, 0.10);
    --bg-glow-2: rgba(59, 130, 246, 0.12);
    --panel: rgba(14, 22, 42, 0.62);
    --panel-solid: #0d1526;
    --border: rgba(94, 190, 255, 0.20);
    --border-strong: rgba(94, 190, 255, 0.45);
    --text: #e7f1ff;
    --muted: #85a0c4;
    --accent: #38bdf8;
    --accent-2: #22d3ee;
    --accent-contrast: #04121c;
    --error: #ff6b81;
    --success: #34ecb0;
    --warning: #facc15;
    --glow: 0 0 18px rgba(56, 189, 248, 0.35);
    --shadow: 0 10px 40px rgba(0, 0, 0, 0.55);
    --blur: blur(16px);
}

:root[data-theme="light"] {
    /* Praiana: areia/creme, azul de céu fraco, verde piscina, com uma
       transparência leve nos painéis (glass) — não branco puro, não chapado. */
    --bg: #ede1c9;
    --bg-glow-1: rgba(111, 163, 201, 0.16);
    --bg-glow-2: rgba(79, 184, 168, 0.18);
    --panel: rgba(255, 250, 240, 0.55);
    --panel-solid: #fbf6ea;
    --border: rgba(191, 156, 110, 0.32);
    --border-strong: rgba(191, 156, 110, 0.55);
    --text: #3d3324;
    --muted: #8a7c65;
    --accent: #6fa3c9;
    --accent-2: #4fb8a8;
    --accent-contrast: #fbf6ea;
    --error: #c0392b;
    --success: #2f8f5b;
    --warning: #b8860b;
    --glow: 0 2px 16px rgba(79, 184, 168, 0.22);
    --shadow: 0 8px 28px rgba(120, 96, 54, 0.14);
    --blur: blur(14px);
}

* { box-sizing: border-box; }

html, body {
    height: 100%;
    margin: 0;
}

body {
    font-family: -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background:
        radial-gradient(circle at 12% 15%, var(--bg-glow-1), transparent 40%),
        radial-gradient(circle at 88% 85%, var(--bg-glow-2), transparent 45%),
        var(--bg);
    color: var(--text);
    transition: background-color .25s ease, color .25s ease;
}

/* Grade sutil "Tron" — padrão (escuro); removida no tema claro logo abaixo */
body {
    background-image:
        radial-gradient(circle at 12% 15%, var(--bg-glow-1), transparent 40%),
        radial-gradient(circle at 88% 85%, var(--bg-glow-2), transparent 45%),
        repeating-linear-gradient(0deg, rgba(94,190,255,0.035) 0px, rgba(94,190,255,0.035) 1px, transparent 1px, transparent 40px),
        repeating-linear-gradient(90deg, rgba(94,190,255,0.035) 0px, rgba(94,190,255,0.035) 1px, transparent 1px, transparent 40px);
}
:root[data-theme="light"] body {
    background-image:
        radial-gradient(circle at 12% 15%, var(--bg-glow-1), transparent 40%),
        radial-gradient(circle at 88% 85%, var(--bg-glow-2), transparent 45%);
}

a { color: var(--accent); }

/* ===================== Login ===================== */

.centered-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 16px;
}

.card {
    background: var(--panel);
    backdrop-filter: var(--blur);
    -webkit-backdrop-filter: var(--blur);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 28px;
    width: 100%;
    max-width: 380px;
    box-shadow: var(--shadow);
}

.login-card h1 { margin: 0 0 4px; text-shadow: none; }
:root[data-theme="dark"] .login-card h1 { text-shadow: var(--glow); }

.subtitle { color: var(--muted); margin: 0 0 20px; font-size: 14px; }

label { display: block; margin: 14px 0 6px; font-size: 13px; color: var(--muted); }

input, textarea {
    width: 100%;
    padding: 10px 12px;
    background: rgba(0, 0, 0, 0.15);
    border: 1px solid var(--border);
    border-radius: 10px;
    color: var(--text);
    font-size: 14px;
    font-family: inherit;
}
:root[data-theme="light"] input,
:root[data-theme="light"] textarea {
    background: rgba(255, 250, 240, 0.55);
}
input:focus, textarea:focus {
    outline: none;
    border-color: var(--border-strong);
    box-shadow: var(--glow);
}

button {
    font-family: inherit;
    cursor: pointer;
}

.login-card button[type="submit"] {
    margin-top: 20px;
    width: 100%;
    padding: 11px 14px;
    background: linear-gradient(135deg, var(--accent), var(--accent-2));
    color: var(--accent-contrast);
    font-weight: 700;
    border: none;
    border-radius: 10px;
    box-shadow: var(--glow);
}
.login-card button[type="submit"]:hover { filter: brightness(1.08); }

.alert {
    padding: 10px 12px;
    border-radius: 8px;
    font-size: 13px;
    margin-bottom: 12px;
}
.alert-error   { background: rgba(255,107,129,.15); color: var(--error); border: 1px solid rgba(255,107,129,.4); }
.alert-success { background: rgba(52,236,176,.15); color: var(--success); border: 1px solid rgba(52,236,176,.4); }
.alert-warning { background: rgba(250,204,21,.15); color: var(--warning); border: 1px solid rgba(250,204,21,.4); }

/* ===================== Layout principal (sidebar + chat) ===================== */

.shell {
    display: flex;
    height: 100vh;
}

.sidebar {
    width: 272px;
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    background: var(--panel);
    backdrop-filter: var(--blur);
    -webkit-backdrop-filter: var(--blur);
    border-right: 1px solid var(--border);
    padding: 16px 12px;
}

.sidebar-header { padding: 4px 8px 16px; }
.brand { font-weight: 700; font-size: 16px; letter-spacing: .2px; }
:root[data-theme="dark"] .brand { text-shadow: var(--glow); }

.new-chat-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    width: 100%;
    padding: 10px 14px;
    background: transparent;
    border: 1px solid var(--border-strong);
    border-radius: 999px;
    color: var(--text);
    font-size: 14px;
    font-weight: 600;
}
.new-chat-btn span { font-size: 16px; line-height: 1; }
.new-chat-btn:hover { border-color: var(--accent); box-shadow: var(--glow); }

.conversation-list {
    flex: 1;
    overflow-y: auto;
    margin-top: 14px;
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.conversation-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    padding: 9px 12px;
    border-radius: 10px;
    cursor: pointer;
    color: var(--muted);
    font-size: 13.5px;
}
.conversation-item:hover { background: rgba(127, 127, 127, 0.10); color: var(--text); }
.conversation-item.active {
    background: rgba(56, 189, 248, 0.12);
    color: var(--text);
    border: 1px solid var(--border);
}
.conversation-title {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.conversation-delete {
    background: transparent;
    border: none;
    color: var(--muted);
    opacity: 0;
    font-size: 13px;
    padding: 2px 4px;
    border-radius: 6px;
}
.conversation-item:hover .conversation-delete { opacity: 1; }
.conversation-delete:hover { color: var(--error); }

.sidebar-footer {
    border-top: 1px solid var(--border);
    padding-top: 12px;
    margin-top: 8px;
    display: flex;
    align-items: center;
    gap: 6px;
}

.icon-btn {
    background: transparent;
    border: 1px solid transparent;
    border-radius: 10px;
    padding: 7px 9px;
    font-size: 15px;
    color: var(--text);
}
.icon-btn:hover { border-color: var(--border); background: rgba(127,127,127,.08); }

/* Switch de tema: PC (segue o sistema) / lua (escuro) / sol (claro) */
.theme-switch {
    display: flex;
    gap: 2px;
    padding: 3px;
    border-radius: 999px;
    background: rgba(127, 127, 127, 0.10);
    border: 1px solid var(--border);
}
.theme-switch-btn {
    background: transparent;
    border: none;
    border-radius: 999px;
    width: 26px;
    height: 26px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12.5px;
    line-height: 1;
    color: var(--muted);
    cursor: pointer;
    transition: background-color .15s ease, color .15s ease, box-shadow .15s ease;
}
.theme-switch-btn:hover { color: var(--text); }
.theme-switch-btn.active {
    background: linear-gradient(135deg, var(--accent), var(--accent-2));
    color: var(--accent-contrast);
    box-shadow: var(--glow);
}

.user-chip {
    margin-left: auto;
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    font-size: 12px;
    color: var(--muted);
    line-height: 1.4;
}
.user-chip a { color: var(--accent); text-decoration: none; }

/* ---------- Área principal do chat ---------- */

.main {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
    padding: 24px clamp(16px, 6vw, 120px);
}

.chat-log {
    flex: 1;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 12px;
    padding: 8px 4px 16px;
}

.empty-state {
    margin: auto;
    text-align: center;
    color: var(--muted);
    max-width: 480px;
}
.empty-state h1 {
    font-size: 30px;
    margin-bottom: 8px;
    background: linear-gradient(135deg, var(--accent), var(--accent-2));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.chat-msg {
    padding: 12px 16px;
    border-radius: 14px;
    max-width: 72%;
    font-size: 14.5px;
    line-height: 1.5;
    white-space: pre-wrap;
}
.chat-msg.user {
    align-self: flex-end;
    background: linear-gradient(135deg, var(--accent), var(--accent-2));
    color: var(--accent-contrast);
    font-weight: 500;
}
.chat-msg.assistant {
    align-self: flex-start;
    background: var(--panel);
    backdrop-filter: var(--blur);
    -webkit-backdrop-filter: var(--blur);
    border: 1px solid var(--border);
}
:root[data-theme="dark"] .chat-msg.assistant { box-shadow: 0 0 0 1px rgba(94,190,255,0.05); }
.chat-msg.system {
    align-self: center;
    color: var(--muted);
    font-size: 12.5px;
    background: transparent;
    padding: 4px 8px;
}
.chat-msg a { color: inherit; font-weight: 700; text-decoration: underline; }

.chat-msg-image {
    display: block;
    max-width: 240px;
    max-height: 240px;
    border-radius: 10px;
    margin-top: 8px;
    border: 1px solid rgba(0,0,0,.25);
}

/* ---------- Input ---------- */

.chat-form {
    display: flex;
    gap: 10px;
    align-items: flex-end;
    background: var(--panel);
    backdrop-filter: var(--blur);
    -webkit-backdrop-filter: var(--blur);
    border: 1px solid var(--border);
    border-radius: 18px;
    padding: 8px 10px;
    box-shadow: var(--shadow);
}
.chat-form textarea {
    flex: 1;
    resize: none;
    border: none;
    background: transparent;
    padding: 8px 4px;
    max-height: 140px;
}
.chat-form textarea:focus { box-shadow: none; }

.chat-form button[type="submit"] {
    padding: 10px 20px;
    background: linear-gradient(135deg, var(--accent), var(--accent-2));
    color: var(--accent-contrast);
    font-weight: 700;
    border: none;
    border-radius: 999px;
}
.chat-form button[type="submit"]:disabled { opacity: .5; cursor: not-allowed; }

#chat-attach {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text);
    border-radius: 999px;
    padding: 9px 12px;
    font-size: 15px;
}
#chat-attach:hover { border-color: var(--accent); }

.image-preview {
    position: relative;
    display: inline-block;
    margin: 0 0 8px 4px;
}
.image-preview[hidden] { display: none; }
.image-preview img {
    max-height: 84px;
    border-radius: 10px;
    border: 1px solid var(--border);
    display: block;
}
.image-preview button {
    position: absolute;
    top: -8px;
    right: -8px;
    width: 22px;
    height: 22px;
    margin: 0;
    padding: 0;
    border: none;
    border-radius: 50%;
    background: var(--error);
    color: #fff;
    font-size: 14px;
    line-height: 1;
}

/* ===================== Modal (Configurações) ===================== */

.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.45);
    backdrop-filter: blur(3px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 50;
}
/* Regra própria sempre vence a padrão do navegador pro atributo [hidden]
   quando a especificidade empata — sem isso, "hidden" não escondia nada
   e o modal ficava travado visível o tempo todo. */
.modal-overlay[hidden] { display: none; }

.modal { position: relative; }
.modal-close {
    position: absolute;
    top: 10px;
    right: 12px;
    background: transparent;
    border: none;
    color: var(--muted);
    font-size: 20px;
    line-height: 1;
}
.modal-close:hover { color: var(--text); }

#settings-save {
    margin-top: 18px;
    width: 100%;
    padding: 10px 14px;
    background: linear-gradient(135deg, var(--accent), var(--accent-2));
    color: var(--accent-contrast);
    font-weight: 700;
    border: none;
    border-radius: 10px;
}
#settings-save:disabled { opacity: .6; cursor: not-allowed; }

/* ===================== Responsivo ===================== */

@media (max-width: 760px) {
    .shell { flex-direction: column; }
    .sidebar {
        width: 100%;
        height: auto;
        flex-direction: row;
        align-items: center;
        border-right: none;
        border-bottom: 1px solid var(--border);
        gap: 10px;
        overflow-x: auto;
    }
    .conversation-list { display: none; }
    .sidebar-header { padding: 0; }
    .new-chat-btn { width: auto; white-space: nowrap; }
    .sidebar-footer { margin-left: auto; border-top: none; padding-top: 0; }
    .main { padding: 16px; }
    .chat-msg { max-width: 88%; }
}